WO2019061170A1 - Load detection method, load detection circuit and electronic device - Google Patents

Abstract

Provided are a load detection method, a load detection circuit and an electronic device, which relate to the technical field of load detection. The load detection method is applied to a load loop, the load loop comprises a thyristor module (42) and a load (43), and the thyristor module (42) is connected to the load (43) in series. A load detection method (60) comprises: determining an operating mode of a load (43) (61); according to the operating mode of the load (43), sampling a current detection signal flowing through the load (43) (62), wherein an operating state of a thyristor module (42) comprises a conductive period or a cut-off period, the current detection signal comprises a first alternating-current signal or a second alternating-current signal, the first alternating-current signal is acquired by sampling when the operating state of the thyristor module (42) is the conductive period, and the second alternating-current signal is acquired by sampling when the operating state of the thyristor module (42) is the cut-off period; and according to the current detection signal and the operating state of the thyristor module (42), determining an operating state of a load loop(63). By means of the method, corresponding load detection control logic can be flexibly configured according to an operating mode of a load.

Description

Load detection method, load detection circuit and electronic device Technical field

The present application relates to the field of load detection technologies, and in particular, to a load detection method, a load detection circuit, and an electronic device.

Background technique

Load control is the ultimate goal of all types of electronic intelligent control products. In order to realize the state detection of the load, the prior art detects the resistance in series in the load circuit. When the load current of the load circuit flows through the detection resistor, the load current is sampled, and then the sampling current is amplified to be processed. The step determines the load state by analyzing the amplified current signal.

In general, different modes of operation can vary. For example, for a load, the heater is heated by a resistance wire, and the heater operates in a full-wave mode of operation, that is, it can convert all of the power into heat. For the load to be an engine, in order to control the rotational frequency of the engine, the engine generally operates in a phase control mode of operation to flexibly adjust the rotational frequency of the engine.

In the process of implementing the present application, the inventors have found that at least the following problems exist in the prior art: the conventional technology can only detect the load state by using a single detection method, and it is not able to flexibly configure the corresponding load detection control logic according to the working mode of the load.

Application content

An object of the embodiments of the present application is to provide a load detection method, a load detection circuit, and an electronic device, which solve the technical problem that the conventional technology cannot flexibly configure the corresponding load detection control logic according to the working mode of the load.

To solve the above technical problem, the embodiment of the present application provides the following technical solutions:

In a first aspect, an embodiment of the present application provides a load detection method, which is applied to a load circuit, where the load circuit includes a thyristor module and a load, and the thyristor module is connected in series with the load, and the method includes: Determining an operating mode of the load; sampling a current detecting signal flowing through the load according to an operating mode of the load, an operating state of the thyristor module Including a conduction period or a deadline, the current detection signal includes a first alternating current signal or a second alternating current signal, and the first alternating current signal is sampled when an operating state of the thyristor module is an on period, The second AC signal is obtained by sampling when the working state of the thyristor module is a deadline; and determining an operating state of the load circuit according to the current detection signal and an operating state of the thyristor module.

Optionally, the working mode of the load includes a full wave working mode, the full wave working mode is used to indicate that the load works in a full power state; and according to an operating mode of the load, sampling flows through the load The current detection signal includes: according to the full-wave operation mode of the load, when the phase of the AC signal is at a zero-crossing point, transmitting a first control signal to switch the thyristor module to operate in a deadline; When the silicon module operates during the deadline, the second AC signal flowing through the load is sampled.

Optionally, the sampling the current detection signal flowing through the load according to the working mode of the load, further comprising: transmitting, according to the full-wave operation mode of the load, when the phase of the AC signal is at a zero crossing point And controlling the signal to switch the thyristor module to operate during the conducting period; sampling the first alternating current signal.

Optionally, the working mode of the load includes a phase control working mode, the phase control working mode is used to indicate that the load works in a power variable state; and according to an operating mode of the load, sampling flows through the The current detection signal of the load includes: sampling the second alternating current signal according to a phase control operation mode of the load, when a phase of the alternating current signal is between an alternating current zero crossing point and a control angle of the thyristor module.

Optionally, the sampling the current detection signal flowing through the load according to the working mode of the load, further comprising: controlling a working mode according to a phase of the load, where a phase of the alternating current signal is greater than the thyristor module The third control signal is sent to switch the thyristor module to operate during the conduction period; the first alternating current signal is sampled.

Optionally, an operating state of the load circuit includes a load state of the load and a switch state of the thyristor module; and determining, according to the current detection signal and an operating state of the thyristor module, The working state of the load circuit includes: determining that the switch state is an abnormal state or the load state is abnormal when the thyristor module is in a deadline and the second alternating current signal is at a low level State; at the thyristor module In a case where the deadline and the second alternating current signal is a high level, determining that the switch state is a normal state, and the load state is a normal state; when the thyristor module is in a conduction period, and When the first AC signal is at a low level, determining that the switch state is a normal state; in a case where the thyristor module is in an on period and the first AC signal is at a high level, It is determined that the switch state is an abnormal state.

In a second aspect, the embodiment of the present application provides a load detecting device, which is applied to a load circuit, the load circuit includes a thyristor module and a load, and the thyristor module is connected in series with the load, and the device includes: a first determining module, configured to determine an operating mode of the load, and a sampling module, configured to sample a current detecting signal flowing through the load according to an operating mode of the load, where an operating state of the thyristor module includes The current detection signal includes a first alternating current signal or a second alternating current signal, and the first alternating current signal is sampled when the working state of the thyristor module is an on period, the second The AC signal is obtained by sampling when the working state of the thyristor module is a deadline; the second determining module is configured to determine the working of the load circuit according to the current detecting signal and the working state of the thyristor module status.

Optionally, the working mode of the load includes a full wave working mode, where the full wave working mode is used to indicate that the load works in a full power state; the sampling module includes: a first sending unit, configured to a full-wave mode of operation, when the phase of the AC signal is at a zero-crossing point, transmitting a first control signal to switch the thyristor module to operate in a deadline; the first sampling unit is configured to operate in the thyristor module At the expiration date, a second alternating current signal flowing through the load is sampled.

Optionally, the sampling module further includes: a second sending unit, configured to send a second control signal to switch the thyristor module according to a full-wave mode of operation of the load, when a phase of the AC signal is at a zero-crossing point Working in the conduction period; the second sampling unit is configured to sample the first alternating current signal.

Optionally, the working mode of the load includes a phase control working mode, the phase control working mode is used to indicate that the load works in a power variable state, and the sampling module includes: a third sampling unit, configured to The phase control mode of operation of the load, when the phase of the alternating current signal is between the alternating zero crossing point and the control angle of the thyristor module, sampling The second AC signal.

Optionally, the sampling module further includes: a third sending unit, configured to send a third control signal according to a phase control working mode of the load, when a phase of the alternating current signal is greater than a control angle of the thyristor module The switching of the thyristor module is performed in an on-period; and the fourth sampling unit is configured to sample the first alternating current signal.

Optionally, the working state of the load circuit includes a load state of the load and a switch state of the thyristor module; the second determining module includes: a first determining unit, configured to be in the thyristor When the module is in the deadline and the second AC signal is low, determining that the switch state is an abnormal state or the load state is an abnormal state; and a second determining unit is configured to be in the thyristor The module is in a deadline, and the second AC signal is at a high level, determining that the switch state is a normal state, and the load state is a normal state; and a third determining unit is configured to be controllable When the silicon module is in an on-period and the first alternating current signal is at a low level, determining that the switch state is a normal state; and a fourth determining unit, configured to: when the thyristor module is in an on-period, And in a case where the first alternating current signal is at a high level, determining that the switch state is an abnormal state.

In a third aspect, an embodiment of the present application provides a load detection circuit, which is applied to a load circuit, the load circuit includes a thyristor module and a load, and the thyristor module is connected in series with the load, and the load detection circuit The system includes: a conversion module for parallel connection with the thyristor module, and the conversion module is configured to sample a current detection signal flowing through the load circuit, and an operating state of the thyristor module includes an on period or a cutoff period The current detection signal includes a first alternating current signal or a second alternating current signal, and the first alternating current signal is sampled when the working state of the thyristor module is an on period, and the second alternating current signal is in the The working state of the thyristor module is obtained by sampling during the deadline; the control module is connected to the conversion module, and is configured to send a control signal to the thyristor module and receive the current detection signal; wherein The control module includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory is stored with the at least one Instructions executed by a processor, the instructions by the at least one processor, to cause at least one processor executing the load detecting method according to any one can be used.

Optionally, the thyristor module comprises a triac and a trigger circuit; The control silicon includes a first main terminal, a second main terminal, and a control end, and the conversion module is configured to be connected between the first main terminal and the second main terminal, the load end and the second main The terminal is connected, the other end of the load is grounded, the control end is connected to the output end of the trigger circuit, and the input end of the trigger circuit is used for inputting a control signal.

Optionally, the conversion module includes: an optocoupler unit, configured to sample a current detection signal flowing through the load circuit, the output of the optocoupler unit is connected to the control module; and a current limiting unit is configured to limit the flow The current of the photocoupler unit is connected to the input end of the optocoupler unit, and the current limiting unit input end is connected to the first main terminal.

Optionally, the instructions are executed by the at least one processor to enable the at least one processor to perform an operation according to the load, and sampling the current detection signal flowing through the load includes: Obtaining an opening voltage of the optocoupler unit when the load is in a phase control mode; determining whether an AC voltage corresponding to a control angle of the triac is greater than an on voltage of the optocoupler unit; if greater than, Sampling the second alternating current signal between an alternating zero crossing and a control angle of the triac; if less than, determining from the alternating current driving signal that drives the load to be greater than or equal to the opening voltage And an alternating current signal; controlling the two-way thyristor to operate during a cutoff period between the phase of the alternating zero crossing and the third alternating current signal; and sampling the second alternating current signal.

Optionally, the optocoupler unit includes a first optocoupler and a first resistor, one end of the first optocoupler's primary side is connected to the current limiting unit, and the other end of the first optocoupler's primary side is connected to The second main terminal, one end of the first photocoupler secondary side is connected to an external power source, and the other end of the first photocoupler secondary side is respectively connected to one end of the first resistor and the control module. The other end of the first resistor is grounded.

Optionally, the conversion module further includes: a protection unit connected between the second main terminal and a first node between the current limiting unit and the optocoupler unit, for The input voltage of the optocoupler unit is clamped.

Optionally, the optocoupler unit includes a second optocoupler, a third optocoupler, a second resistor, and a third resistor; one end of the second optocoupler primary side is connected to the current limiting unit, and the second The other end of the optocoupler primary side is connected to one end of the third optocoupler secondary side, one end of the second optocoupler secondary side is connected to an external power source, and the other end of the second optocoupler secondary side is respectively associated with the One of the second resistors The end is connected to the control module, the other end of the second resistor is grounded, the other end of the third optocoupler side is connected to the second main terminal, and one end of the third optocoupler primary side is connected to One end of the third resistor, the other end of the third resistor is connected to an external power source, and the other end of the third photocoupler is connected to the control module.

Optionally, the instructions are executed by the at least one processor, such that the at least one processor is further operable to: transmit a fourth control signal to the third optocoupler to The three optocouplers switch to different working states.

In a fourth aspect, an embodiment of the present application provides an electronic device, where the electronic device includes the load detection circuit of any one of the foregoing.

In a fifth aspect, an embodiment of the present application provides a non-transitory computer readable storage medium, where the non-transitory computer readable storage medium stores computer executable instructions for causing an electronic device to execute The load detection method of any of the above.

In various embodiments of the present application, by determining the working mode of the load, the current detecting signal flowing through the load is sampled according to the working mode of the load, and the working state of the load circuit is determined according to the current detecting signal and the working state of the thyristor module. Therefore, it can flexibly configure the corresponding load detection control logic according to the working mode of the load.

DRAWINGS

The one or more embodiments are exemplified by the accompanying drawings in the accompanying drawings, and FIG. The figures in the drawings do not constitute a scale limitation unless otherwise stated.

1 is a schematic diagram of an application scenario for detecting a load of a refrigerator according to an embodiment of the present application;

2 is a schematic diagram of current waveforms when a heater is in operation according to an embodiment of the present application;

FIG. 3a is a schematic diagram of a current waveform when an engine is in operation according to an embodiment of the present application; FIG.

FIG. 3b is a schematic diagram of current waveforms when another engine is in operation according to an embodiment of the present application; FIG.

4 is a schematic block diagram of a load detection system according to an embodiment of the present application;

FIG. 5 is a schematic diagram of waveforms of respective signals in a full-wave operation mode according to an embodiment of the present application; FIG.

FIG. 6 is a schematic diagram of waveforms of respective signals in a phase control working mode according to an embodiment of the present application; FIG.

7 is a schematic structural diagram of a load detection circuit according to an embodiment of the present application;

FIG. 8 is a schematic structural diagram of a control module according to an embodiment of the present application;

9 is a schematic structural diagram of a load detection system according to an embodiment of the present application;

FIG. 10 is a schematic structural diagram of a load detection system according to another embodiment of the present application; FIG.

FIG. 11 is a waveform diagram of a sinusoidal alternating current signal in a phase control working mode according to an embodiment of the present application; FIG.

FIG. 12 is a schematic structural diagram of a load detection system according to still another embodiment of the present application;

FIG. 13 is a schematic structural diagram of a load detection system according to still another embodiment of the present application;

FIG. 14 is a schematic structural diagram of a load detecting apparatus according to an embodiment of the present application; FIG.

FIG. 15 is a schematic structural diagram of a sampling module according to an embodiment of the present application;

16 is a schematic structural diagram of a sampling module according to another embodiment of the present application;

FIG. 17 is a schematic structural diagram of a sampling module according to still another embodiment of the present application;

FIG. 18 is a schematic structural diagram of a second determining module according to an embodiment of the present application;

FIG. 19 is a schematic flowchart diagram of a load detection method according to an embodiment of the present application;

FIG. 20 is a schematic flowchart of a step 62 according to an embodiment of the present application;

FIG. 21 is a schematic flowchart of a step 62 according to another embodiment of the present application;

FIG. 22 is a schematic flowchart diagram of step 62 according to still another embodiment of the present application;

FIG. 23 is a schematic flowchart diagram of step 63 provided by an embodiment of the present application.

Detailed ways

In order to make the objects, technical solutions, and advantages of the present application more comprehensible, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It is understood that the specific embodiments described herein are merely illustrative of the application and are not intended to be limiting.

The detection of the load loop is an embodiment of the realization of the product intelligence. In some product applications, the load circuit includes a load and a switch module in series with the load, and the working state of the load can be controlled by controlling the switch state of the switch module. However, in some product applications, the load loop of the product is abnormal due to excessive product working time or other external factors. State, the product often fails to detect the abnormal state of the load loop in time and cannot accurately complete the subsequent control logic. For example, for a refrigerator, the controller needs to detect the working state of the compressor in order to prompt the user to rework in time or to execute the control logic of the subsequent functional module.

FIG. 1 is a schematic diagram of an application scenario for detecting a load of a refrigerator according to an embodiment of the present application. As shown in FIG. 1, the load of the refrigerator here is the compressor 11, and by controlling the closed or open state of the switch 12, the working state of the compressor 11 can be controlled correspondingly, so that the power source 13 supplies current to the compressor 11, wherein The conversion circuit 14 collects the strong electric current flowing through the compressor 11, and performs strong and weak isolation processing, and sends a weak electric signal to the control circuit 15, and the control circuit 15 determines the switch 12 and the compressor 11 based on the weak electric signal and the switching state of the switch 12. Actual working status. When the control circuit 15 determines that the switch 12 or the compressor 11 is in an abnormal state, the control circuit 15 activates the alarm circuit 16 to perform an alarm so that the user can return the compressor 11 in time. Alternatively, when the control circuit 15 determines that both the switch 12 and the compressor 11 are in a normal state, the control circuit 15 may perform the execution of the subsequent control logic, for example, by the display 17 indicating that the current refrigerator is operating normally.

Therefore, by setting the load detection circuit, it is able to find the problem of the load circuit in time, and automatically handle the problem, thereby realizing product intelligence.

The above embodiment is merely a connection form of the load circuit. In some embodiments, the manner, number, and control logic of the switches and loads in the load loop are different. However, the load in the load circuit is correspondingly operated according to the working state of the switch.

The above embodiment gives the training content of the load as a compressor. In many application scenarios, the load can be any form of equipment or component, which is as large as one machine tool, as small as one resistor in a battery system, where the load is not Make any restrictions on the specific form.

However, as mentioned earlier, it can work in different modes of operation for different products or different components within the product. For example, for the heater and engine mentioned above, the heater operates in full-wave mode and the engine operates in phase control mode. For example, please refer to FIG. 2 , which is a schematic diagram of a current waveform when the heater is in operation according to an embodiment of the present application. As shown in FIG. 2, the envelope is a sinusoidal current waveform, the heater operates in a full-wave mode of operation, and the full-wave mode of operation is used to indicate that the load 43 is operating in a full power state, so that it can drive the heater to operate at full frequency. The heater converts all of the power into heat, so the heater works In full power state. Please refer to FIG. 3a and FIG. 3b together. FIG. 3a is a schematic diagram of current waveforms when the engine is in operation according to an embodiment of the present application, and FIG. 3b is a schematic diagram of current waveforms when another engine is in operation according to an embodiment of the present application. As shown in Figure 3a, the envelope is a sinusoidal current waveform, the engine is operating in a phase controlled mode of operation, and the phase control mode is used to indicate that the load 43 is operating in a power variable state. When the corresponding phase is 30 degrees in each cycle (when the corresponding time point is t1), the drive current starts to be input into the engine to drive the engine to operate. As shown in FIG. 3b, when the corresponding phase is 60 degrees in each cycle (when the corresponding time point is t2 and t2 is greater than t1), the driving current starts to be input into the engine to drive the engine to operate.

Therefore, in the normal case of the engineering practice process, when the working mode of the load is the full-wave mode, the current waveform of the driving load is continuous. When the working mode of the load is the phase control working mode, the current waveform of the driving load is regularly interrupted in each cycle, and the initial phase or the ending phase corresponding to the intermittent current is adjustable, therefore, driving The power of the load is variable.

Based on this, the embodiment of the present application provides a load detection system. As shown in FIG. 4, the load detection system 40 includes a load detection circuit 41, a thyristor module 42 and a load 43. The load detection circuit 41 is connected in parallel with the thyristor module 42. The thyristor module 42 is connected in series with the load 43. The thyristor module 42 and the load 43 constitute a load circuit. Therefore, the working state of the load circuit includes the load state of the load 43 and the switching state of the thyristor module 42.

The operating state of the thyristor module 42 includes an on period or a deadline, and the load detection circuit 41 can send a control signal to the thyristor module 42 to switch the thyristor module 42 to operate during the on period or the off period. When the thyristor module 42 is operating in the on-time, normally, the external power source sequentially flows through the thyristor module 42 and the load 43, thereby driving the load 43 to operate. When the thyristor module 42 operates in the off-period, normally, the external power source sequentially flows through the load detecting circuit 41 and the load 43, so that the load detecting circuit 41 can sample the current signal flowing through the load 43. Among them, the external power source can be sinusoidal alternating current and other waveform AC.

In some embodiments, the control signal can also be transmitted by an external control device, and is not limited to the transmission body of the control signal.

As described above, since the different loads have different operating modes, when detecting the operating state of the load circuit, first, the load detecting circuit 41 determines the operating mode of the load 43. Specifically, in some embodiments, the load detection circuit 41 may include a user interaction interface, which may present a binary option for instructing the user to select a working mode of the load, for example, the binary option is “full-wave operation” Mode "and phase control mode", when the user selects "full-wave mode of operation", the load detection circuit 41 can determine that the operating mode of the load 43 is "full-wave mode of operation". When the user selects the "phase control mode of operation", the load detecting circuit 41 can determine that the operating mode of the load 43 is the "phase control mode of operation".

The difference from the above embodiment is that the load detecting circuit 41 can also automatically determine the operating mode of the load 43 according to a preset rule, and does not impose any limitation on the manner in which the load detecting circuit 41 determines the operating mode of the load 43.

Next, after the load detecting circuit 41 determines the operation mode of the load 43, the load detecting circuit 41 samples the current detecting signal flowing through the load 43 in accordance with the operation mode of the load 43. The current detection signal includes a first alternating current signal or a second alternating current signal, and the first alternating current signal is sampled when the working state of the thyristor module 42 is in an on period, and the second alternating current signal is in operation of the thyristor module. The sample is obtained when the status is the deadline. For example: Please refer to FIG. 3a again. For a period of sinusoidal AC signal, between time point t0 (AC zero crossing point) to time t1, since the thyristor module 42 operates in the deadline, t0 to The positive selection AC signal corresponding to t1 may sequentially flow through the load detection circuit 41 and the load 43. Therefore, the positive selection AC signal corresponding to t0 to t1 can be understood as the second AC signal. Similarly, between the time point t1 and the time t3 (the next AC zero-crossing point), since the thyristor module 42 operates in the conduction period, the positive selection AC signals corresponding to t1 to t3 at this time may sequentially flow through. The silicon control module 42 is connected to the load 43, and therefore, the positive selection AC signal corresponding to t1 to t3 can be understood as the first AC signal.

As mentioned above, since the load can operate in different operating modes, the thyristor module 42 can operate in the conduction period for the entire period of the entire sinusoidal AC signal, and can also operate in the deadline and guide in each cycle. The set of periods, therefore, the manner in which the load detection circuit 41 samples the current sense signal will vary for the purposes of the teachings of the embodiments of the present application.

For example, when the working mode of the load 43 is the full-wave operating mode, the load detecting circuit 41 is based on the full-wave operating mode of the load 43 when the phase of the alternating current signal is at the zero-crossing point. The first control signal is sent to switch the thyristor module 42 to operate during the deadline. Further, the load detecting circuit 41 samples the second alternating current signal flowing through the load 43 when the thyristor module 42 operates in the deadline.

Referring to FIG. 5, when the load detecting circuit 41 transmits the first control signal of the low level at the AC zero-crossing point ta, the thyristor module 42 operates in the deadline. At this time, since the thyristor module 42 is turned off, when the thyristor module 42 and the load 43 are both in the normal state, the corresponding sinusoidal current signals between the time points ta to tb sequentially flow through the load detecting circuit 41 and The load 43, therefore, the load detecting circuit 41 samples a second alternating current signal flowing through the load 43, which is a high level signal corresponding to the sinusoidal current signal between time points ta to tb. However, in the actual process, the thyristor module 42 and the load 43 may operate in an abnormal state, for example, the thyristor module 42 or the load 43 has been damaged, and therefore, the second alternating current signal may be at a low level.

For another example, when the working mode of the load 43 is the full-wave operating mode, the load detecting circuit 41 according to the full-wave operating mode of the load 43, when the phase of the alternating current signal is at the zero-crossing point, the load detecting circuit 41 goes to the thyristor module. 42 sends a second control signal to switch the thyristor module 42 to operate during the on period. Further, the load detecting circuit 41 samples the first alternating current signal flowing through the load 43 when the thyristor module 42 operates in the on period.

Referring to FIG. 5 again, the thyristor module 42 receives a second control signal at a high level crossing point of each half cycle, and the thyristor module 42 is switched to operate during the on period, for example: A high level second control signal is transmitted at the AC zero crossings of time points tb, tc, td. According to this cycle, the entire sinusoidal AC signal can be continuously input to the load 43.

For example, when the working mode of the load 43 is the phase control working mode, the load detecting circuit 41 controls the working mode according to the phase of the load 43, and the phase of the alternating current signal is at the alternating zero crossing point to the control angle of the thyristor module 42. The second alternating current signal is sampled. Wherein, the control angle can be determined according to the power demand of the load.

Referring to FIG. 6, the control angle of the thyristor module 42 is 45 degrees, wherein the control point corresponds to a time point of tg. The load detecting circuit 41 can use the second alternating current signal to be sampled during the off period of the thyristor module 42, that is, the load detecting circuit 41 can collect the second alternating current signal from the time point tg to the time point th. Working on the thyristor module 42 and the load 43 In the normal state, the second AC signal flows through the load detecting circuit 41 and the load 43. When the thyristor module 42 or the load 43 is operating in an abnormal state, for example, the thyristor module 42 or the load 43 has been damaged, it does not necessarily have a second AC signal flowing through the load detecting circuit 41 and the load 43.

For another example, when the working mode of the load 43 is the phase control working mode, the load detecting circuit 41 controls the working mode according to the phase of the load 43 and sends the third when the phase of the alternating current signal is greater than the control angle of the thyristor module 42. The control signal is used to switch the thyristor module 42 to operate during the on period. Further, the load detecting circuit 41 samples the first alternating current signal flowing through the load 43 when the thyristor module 42 operates in the on period.

Referring again to FIG. 6, the thyristor module 42 receives a third control signal at a high level at the control angle of each half cycle, and the thyristor module 42 is switched to operate during the on period, for example: The time tj, tk, tl sends a third control signal of a high level, and cycles accordingly.

As described above, the working state of the load circuit includes the load state of the load 43 and the switching state of the thyristor module 42. Further, the load state of the load 43 includes a normal state and an abnormal state, and the switching state of the thyristor module 42 includes Normal state and abnormal state.

The normal state and abnormal state of the thyristor module 42 or the load 43 are understood to be:

Based on the control logic of the thyristor module 42, under normal control logic, when the thyristor module 42 receives the control signal, the thyristor module 42 should be closed or open. However, when the thyristor module 42 is abnormal, the control signal originally indicates that the switch enters the closed state, and the thyristor module 42 enters the disconnected state, and the switch at this time is abnormal. Similarly, if the control signal originally indicates that the thyristor module 42 enters the off state, the thyristor module 42 enters the closed state, and the thyristor module 42 is abnormal at this time.

Based on the control logic of the load 43, under normal control logic, when the load 43 receives power for operation, the operating state of the load 43 at this time is a normal state, and when the load 43 receives power but fails to operate, the load at this time The working state is an abnormal state. For example, the compressor 11 shown in Fig. 1 performs a cooling operation when the compressor 11 receives electric power, and the operating state of the compressor 11 at this time is a normal state. When the compressor 11 receives power but is unable to perform the cooling operation, the operating state of the compressor 11 at this time is an abnormal state.

The normal operation of the thyristor module 42 and the load 43 described in the above embodiments can be understood as Follow the system work requirements to complete the corresponding actions. For example, when the thyristor module 42 is used as a switch, and the load detecting circuit 41 indicates that the thyristor module 42 is disconnected, the thyristor module 42 is switched to the off state, and the thyristor module 42 is in a normal state at this time, and vice versa. . For another example, when the load 43 is in a normal working state, it will work according to the closed or open state of the thyristor module 42. When the thyristor module 42 is closed, the load 43 should be working, and the load 43 is Normal working condition. When the switch is turned off, the load 43 should be stopped, which is the normal working state of the load 232, and vice versa.

Finally, the load detection circuit 41 determines the operating state of the load circuit based on the current detection signal and the operating state of the thyristor module 42.

Specifically, in a case where the thyristor module 42 is in a deadline and the second alternating current signal is at a low level, the load detecting circuit 41 determines that the switch state is an abnormal state or the load state is an abnormal state. Alternatively, in a case where the thyristor module 42 is in the off-period and the second alternating current signal is at the high level, the load detecting circuit 41 determines that the switching state is the normal state, and the load state is the normal state. For example, referring to FIG. 5, the load detection circuit 41 sends a control signal to indicate that the thyristor module 42 is disconnected, that is, the thyristor module 42 is in a deadline, and it is assumed that the working state of the thyristor module 42 is normal. (OFF), the operating state of the load 43 is a normal state (connected current), and the corresponding sinusoidal current signal between the time points ta to tb sequentially flows through the load detecting circuit 41 and the load 43, and therefore, the second alternating current signal should be high. Level. However, when the operating state of the thyristor module 42 is an abnormal state (closed) or the operating state of the load 43 is an abnormal state (off current), then the second alternating current signal should be low. Therefore, the load detecting circuit 41 can reverse the operating state of the thyristor module 42 or the load 43. The same is true, and this conclusion can also be drawn in conjunction with FIG. 6 and will not be described here.

Further, in a case where the thyristor module 42 is in the on period and the first alternating current signal is at the low level, the load detecting circuit 41 determines that the switch state is the normal state. Alternatively, in a case where the thyristor module 42 is in the on period and the first alternating current signal is at the high level, the load detecting circuit 41 determines that the switching state is an abnormal state. For example: Referring to FIG. 5 again, the load detection circuit 41 sends a control signal to indicate that the thyristor module 42 is closed, that is, the thyristor module 42 is in the on period, and it is assumed that the working state of the thyristor module 42 is normal. (OFF), the working state of the load 43 is the normal state (connected current), and the correspondence between the time points tb to tc The sinusoidal current signal sequentially flows through the thyristor module 42 and the load 43, but it does not flow through the load detecting circuit 41. Therefore, the first alternating current signal should be low. However, when the operating state of the thyristor module 42 is an abnormal state (off current), the corresponding sinusoidal current signal between the time points tb to tc sequentially flows through the load detecting circuit 41 and the load 43, thus, the second alternating current The signal should be high. Therefore, the load detecting circuit 41 can reverse the operating state of the thyristor module 42 or the load 43. The same is true, and this conclusion can also be drawn in conjunction with FIG. 6 and will not be described here.

In summary, the load detection circuit 41 can flexibly configure the corresponding load detection control logic according to the operating mode of the load.

Referring to FIG. 7 , in some embodiments, the load detection circuit 41 includes a conversion module 411 and a control module 412 . The conversion module 411 is connected in parallel with the thyristor module 42 . The control module 412 is connected to the conversion module 411 .

The conversion module 411 is configured to sample the current detection signal flowing through the load circuit and send the current detection signal to the control module. In some embodiments, the conversion module 411 can convert a sinusoidal AC signal flowing through the load loop into a weak electrical signal, which can be a high level or a low level. The conversion module 411 samples the sinusoidal AC signal in various ways. When the load 43 in the load circuit is working, the sinusoidal AC signal flowing through the load 43 flows through the conversion module 411 at the same time, so that the conversion module 411 can The sinusoidal AC signal is acquired. It is also possible that the conversion module 411 can indirectly collect the sinusoidal AC signal flowing through the load 43 through the current sensor.

The control module 412 is configured to send a control signal to the thyristor module 42 and receive the current detection signal. As previously mentioned, the control signal can include the first to third control signals described above that are capable of switching the operational state of the thyristor module 42. The control signal is a square wave signal, and the square wave signal may be a Pulse Width Modulation (PWM) or a Pulse Frequency Modulation (PFM), and the control module 412 may be based on a sinusoidal AC signal. The phase sends a control signal to adjust the power of the load.

Further, referring to FIG. 8, the control module 412 includes at least one processor 4121 and a memory 4122 communicatively coupled to the at least one processor 4121; The memory 4122 stores instructions executable by the at least one processor 4121, the instructions being executed by the at least one processor 4121 to enable the at least one processor 4121 to perform the operations illustrated in the various embodiments above. Control logic for load detection.

Referring to FIG. 9 , the thyristor module 42 includes a triac 421 and a trigger circuit 422 . The two-way thyristor 421 includes a first main terminal T1, a second main terminal T2 and a control terminal G1. The conversion module 411 is connected between the first main terminal T1 and the second main terminal T2, and the end of the load 43 and the second main terminal T2 Connected, the other end of the load 43 is grounded, the control terminal G1 is connected to the output of the trigger circuit 422, and the input terminal of the trigger circuit 422 is used for inputting the control signal EN.

The trigger circuit 422 includes a thyristor photocoupler U3, a resistor R4, a resistor R5, a resistor R6, and a transistor Q1. The first optocoupler main terminal of the thyristor optocoupler U3 is connected to the control terminal G1, and the second optocoupler main terminal and the resistor are connected. One end of R4 is connected, the other end of the resistor R4 is connected with the first main terminal T1, the first infrared diode terminal of the thyristor optocoupler U3 is connected with one end of the resistor R5, the other end of the resistor R5 is connected with an external power source, and the second infrared diode terminal and the triode The collector of Q1 is connected, the base of the transistor Q1 is connected to one end of the resistor R6, the other end of the resistor R6 is used for inputting the control signal EN, and the emitter of the transistor Q1 is grounded.

Under the premise that both the triac 421 and the load 43 are working normally, when the control terminal G1 receives the high level, the triac 421 is triggered and turned on, and then the current of the external power source flows through the bidirectional thyristor 421. With load 43. Since the current does not flow through the conversion module 411, the first AC signal converted by the conversion module 411 is at a low level. When the control terminal G1 receives the low level, the triac 421 is turned off, and then the current of the external power source flows through the conversion module 411 and the load 43. Since the current flows through the conversion module 411, the conversion module 411 converts the current. The second AC signal is at a high level.

The difference from the embodiment shown in FIG. 9 is that, as shown in FIG. 10, the conversion module 411 includes an optocoupler unit 4111, a current limiting unit 4112, and a protection unit 4113. The output end of the optocoupler unit 4111 is connected to the control module 412. The output of the unit 4112 is connected to the input end of the optical coupler 4111, and the input of the current limiting unit 4112 is connected to the first main terminal T1. The protection unit 4113 is connected between the second main terminal T2 and the first node 1D between the current limiting units 4112 and 4111 optocoupler units for clamping the input voltage of the optocoupler unit 4111.

When the control signal is low and indicates that the triac 421 is operating during the deadline, the electricity The flow passes through the current limiting unit 4112, the optocoupler unit 4111, and the load 43, wherein the current limiting unit 4112 limits the current flowing through the optocoupler unit 4111 to protect the optocoupler unit 4111. The optocoupler unit 4111 converts the current flowing through itself into a second AC signal, wherein the second AC signal is at a high level. In the control logic, when the second AC signal is at a high level, the bidirectional thyristor 421 and the load 43 are in a normal state, and when the second AC signal is at a low level, the bidirectional thyristor 421 or the load 43 is operated. Abnormal state.

When the control signal is at a high level and indicates that the triac 421 is operating in the on-period, the current flows through the triac 421 and the load 43 and is not able to flow through the current limiting unit 4112 and the optocoupler unit 4111. The first alternating current signal converted by the optocoupler unit 4111 is at a low level. In the control logic, when the first AC signal is at a low level, it indicates that the triac 421 and the load 43 are in a normal state, and when the first AC signal is at a high level, the bidirectional thyristor 421 is operating in an abnormal state. The load 43 is working in a normal state.

In summary, on the one hand, the load detecting circuit 41 can detect the working state of the load circuit without an amplifying circuit, and therefore the structure of the load detecting circuit 41 is simple and scientific. On the other hand, the load detecting circuit 41 does not need to sample the load current through the detecting resistor, avoids the heat generated by the detecting resistor and interferes with the detection of the control module, thereby making the load detecting circuit 41 work more stable and reliable.

As described above, the present embodiment utilizes the triac 421 to operate in a deadline, and outputs a first alternating current signal or a second alternating current signal (high level or low level) through the strong isolation of the optocoupler unit 4111. The control module 412 determines the actual operating state of the triac 421 and the load 43 based on the weak current signal and the control signal. However, during the conduction period, the sinusoidal alternating voltage corresponding to the control angle of the triac 421 should be greater than the turn-on voltage of the optocoupler unit 4111, so that the sinusoidal alternating voltage can be driven when the triac 421 operates during the cutoff period. The optocoupler unit 4111 is turned on, thereby causing the optocoupler unit 4111 to convert the sinusoidal alternating voltage into a second alternating current signal.

Therefore, first, when the load 43 is operating in the phase control mode, the control module 412 obtains the turn-on voltage Vth of the optocoupler unit 4111, wherein the user can construct a voltage meter corresponding to the turn-on voltage corresponding to each type of optocoupler unit, and pre-store Control module 412 is on memory 4122. When detecting, the control module 412 can find the voltmeter to obtain the corresponding light. The turn-on voltage Vth of the coupling unit 4111.

Next, the control module 412 determines whether the AC voltage V1 corresponding to the control angle of the triac 421 is greater than the turn-on voltage Vth of the optocoupler unit 4111. If greater than, between the AC zero crossing and the control angle of the triac, the control module 412 receives the second AC signal sampled by the conversion module 411. If not, the control module 412 determines a third AC signal that is greater than or equal to the turn-on voltage Vth from the AC drive signal that operates the load 43.

Again, between the phase of the AC zero crossing and the third AC signal, the control module 412 controls the triac 421 to operate during the expiration period.

Finally, the control module 412 receives the second AC signal sampled by the conversion module 411.

For example, please refer to FIG. 11. FIG. 11 is a waveform diagram of a sinusoidal AC signal in which the load operation is in a phase control mode. As shown in FIG. 11, the load operates in the phase control mode. During normal operation, the load detection circuit 41 sends a high level control signal to the triac 421 at a control angle of 45 degrees to trigger the operation of the triac 421. During the on period, the current drives the load 43 to operate.

Here, the positive half-wave between the time points tm and tn is taken as an example for detailed explanation. The control angle of the triac 421 is 45 degrees, the AC voltage corresponding to the control angle is V1, and the AC voltage V2 equal to the turn-on voltage Vth of the optocoupler unit 4111 is determined in the positive half wave, and then determined to be larger than in the positive half wave. The AC voltage V3 of the turn-on voltage Vth of the photocoupler unit 4111, therefore:

V1<Vth, Vth=V2, V2<V3

Since V1 is smaller than Vth, the AC voltage between 0-V1 (the triac 421 is in the off-period) is not able to drive the optocoupler unit 4111 to operate, that is, the optocoupler unit 4111 is cut off at the triac 421. During the period, the second AC signal sampled is low level. However, for the purpose of detection, the user expects that during the deadline, it is assumed that the uncertainty of the two-way thyristor 421 and the load 43 is excluded. In addition, the sampled second AC signal can also be at a high level to enable true detection purposes.

Therefore, when the AC voltage V1 corresponding to the control angle is greater than the turn-on voltage Vth of the optocoupler unit 4111, when the control module 412 is between the AC zero-crossing point and the control angle of the triac, the control module 412 receives the sample sampled by the conversion module 411. Two AC signals.

When the AC voltage corresponding to the control angle is smaller than the turn-on voltage Vth of the photocoupler unit 4111, The control module 412 sends a trigger signal to the triac 421 after V2 to control the triac 421 to operate during the on period, that is, in turn, before the V2, the triac 421 always works in the deadline. (In fact, under normal circumstances, the deadline of the triac 421 is before the AC voltage V1 corresponding to the control angle). Therefore, the control module 412 can receive the second AC signal sampled by the conversion module 411 between the phase corresponding to V2 or V3 at the AC zero-crossing point, so that the detection purpose can be reliably performed.

Referring to FIG. 12, the photocoupler unit 4111 includes a first photocoupler U1 and a first resistor R1. One end of the primary side of the first optocoupler U1 is connected to the current limiting unit 4112, and the other end of the first photocoupler U1 is connected to the first end. The two main terminals T2, one end of the first side of the first optocoupler U1 is connected to the external power source VCC, and the other end of the second side of the first optocoupler U1 is respectively connected with one end of the first resistor R1 and the control module 412, and the other of the first resistor R1 One end is grounded.

The current limiting unit 4112 includes a seventh resistor R7 connected between the first main terminal T1 and one end of the primary side of the first photocoupler U1.

The protection unit 4113 includes a diode D1 whose anode is connected to the second main terminal T2, and the cathode of the diode D1 is connected to one end of the primary side of the first photocoupler U1. Diode D1 is capable of clamping the input voltage of first optocoupler U1.

When the triac 421 is closed, the alternating current sequentially flows through the triac 421 and the load 43. When the triac 421 is disconnected, the alternating current of the positive half cycle sequentially flows through the seventh resistor R7, the first optocoupler U1 and the load 43, and the alternating current of the negative half cycle sequentially flows through the load 43, the diode D1, and the seventh resistor R7. .

Referring to FIG. 13, in some embodiments, in order to prevent the load 43 from being in a weak current consumption state when the load 43 is not working, the optocoupler unit 4111 is further configured to switch in response to the fourth control signal EN2 sent by the control module 412. To different working conditions. For example, when the fourth control signal EN2 is at a high level, the optocoupler unit 4111 is in an off-state, and the weak current at this time is not able to flow through the load, thereby saving power consumption. When the fourth control signal EN2 is at a low level, the optocoupler unit 4111 is in an on state, and a strong current flows through the load at this time.

Specifically, the optocoupler unit 4111 includes a second optocoupler U2, a third optocoupler U3, a second resistor R2, and a third resistor R3. One end of the primary side of the second optical coupler U2 is connected to the current limiting unit 4112, and the other end of the primary side of the second optical coupler U2 is connected to one end of the secondary side of the third optical coupler U3, and the second optical coupler U2 One end of the secondary side is connected to the external power source VCC, and the other end of the secondary side of the second photocoupler U2 is respectively connected to one end of the second resistor R2 and the control module 412, the other end of the second resistor R2 is grounded, and the third side of the third photocoupler U3 is connected. The other end of the third photocoupler U3 is connected to one end of the third resistor R3, the other end of the third resistor R3 is connected to the external power source VCC, and the third photocoupler U3 is on the primary side. The other end is connected to the control module 412.

The other end of the primary side of the third photocoupler U3 receives the fourth control signal EN2, wherein the fourth control signal EN2 controls the operating state of the third photocoupler U3. For example, when the fourth control signal EN2 is at a high level, the third photocoupler U3 is in an off-state, and the weak current at this time cannot flow through the load, thereby saving power consumption. When the fourth control signal EN2 is at a low level, the second photocoupler U2 and the third photocoupler U3 are in an on state, and a weak current flows through the load at this time.

The working principle of the load detecting circuit provided by the embodiment of the present application is further illustrated in the following with reference to FIG. 13 as another embodiment:

As described above, the normal control logic of the triac 421 includes: when the control signal EN1 is at a high level, the triac 421 is closed; when the control signal EN1 is at a low level, the triac 421 is turned off. Further, the control module 412 is aware of the following correspondence: when the control signal EN1 is at a high level, the triac 421 should be closed; when the control signal EN1 is at a low level, the triac 421 should be turned off.

It is assumed that the triac 421 and the load 43 in the load circuit operate in a normal state. The control module 412 passes the zero-crossing detection, and sends a high-level control signal EN1 (PWM signal) at the zero-crossing points of the first two half waves, so that the triac 421 operates in the conduction period. At this time, the first alternating current signal outputted by the secondary side of the second optical coupler U2 is at a low level.

In order to detect whether there is a fault in the triac 421 and the load 43 in the load circuit, the control module 412 sends a control signal EN1 and a fourth control signal EN2 at the first zero crossing of the third half wave, wherein The control signal EN1 is at a high level, and the fourth control signal EN2 is at a low level. At this time, the two-way thyristor 421, the second photocoupler U2, and the third photocoupler U3 are all turned on. Thus, when the control module 412 detects that the first AC signal is low, the control module 412 can determine that the triac 421 is normal. However, when the control module 412 detects that the first AC signal DET is at a high level, the control module 412 can determine that the triac 421 is abnormal.

Then, the control module 412 transmits the control signal EN1 and the fourth control signal EN2 again, wherein the control signal EN1 is at a low level, and the fourth control signal EN2 is at a low level. At this time, the two-way thyristor 421 is turned off, and the second photocoupler U2 and the third photocoupler U3 are both turned on. Thus, when the control module 412 detects that the second AC signal is low, the control module 412 can determine that the triac 421 is abnormal, or that the load 43 is abnormal. However, when the control module 412 detects that the second AC signal is high, the control module 412 can determine that the triac 421 is normal and the load 43 is normal.

Finally, after the user determines the operating state of the triac 421 or the load 43, in order to save power consumption, the control module 412 sends a fourth control signal EN2 of a high level, and the third optocoupler U3 is at the cutoff. State, thereby avoiding the phenomenon that weak current flows through the load 43, saving power consumption.

In some embodiments, control module 22 can be a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic device, discrete gate or transistor logic. , separate hardware components or any combination of these components. Also, the processor herein can be any conventional processor, controller, microcontroller or state machine. Control module 22 can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

In this embodiment, the load detecting circuit 41 can be applied to various types of electronic devices, so that the electronic device implements the various purposes set forth in the embodiments of the present application.

As another aspect of the embodiments of the present application, an embodiment of the present application provides a load detecting apparatus applied to a load circuit. The load circuit may be the load circuit described in the above embodiments, and details are not described herein. The load detection device acts as a software system that can be stored within the control module 412 illustrated in FIG. The load detecting device includes a plurality of instructions stored in a memory, the processor can access the memory, and invoke instructions to perform the load detecting device.

Referring to FIG. 14 , the load detecting device 50 includes a first determining module 51 , a sampling module 52 , and a second determining module 53 .

The first determining module 51 is configured to determine an operating mode of the load.

The sampling module 52 is configured to sample the current detection signal flowing through the load according to the working mode of the load, and the working state of the thyristor module includes a conduction period or a deadline period, and the current detection signal includes a first alternating current signal or a second alternating current signal, An AC signal is obtained by sampling when the working state of the thyristor module is an on-time, and the second AC signal is sampled when the working state of the thyristor module is a deadline.

The second determining module 53 is configured to determine an operating state of the load circuit according to the current detecting signal and the working state of the thyristor module.

Therefore, it can flexibly configure the corresponding load detection control logic according to the working mode of the load.

In some embodiments, the operational mode of the load includes a full wave mode of operation and the full wave mode of operation is used to indicate that the load is operating in a full power state. Therefore, as shown in FIG. 15 , the sampling module 52 includes: a first sending unit 521 and a first sampling unit 522 .

The first sending unit 521 is configured to send a first control signal to switch the thyristor module to operate in a deadline according to a full-wave mode of operation of the load when the phase of the AC signal is at a zero crossing.

The first sampling unit 522 is configured to sample the second alternating current signal flowing through the load when the thyristor module operates in the deadline.

In some embodiments, as shown in FIG. 16, the sampling module 52 further includes: a second sending unit 523 and a second sampling unit 524.

The second sending unit 523 is configured to send a second control signal to switch the thyristor module to operate during the on-time according to the full-wave mode of operation of the load when the phase of the AC signal is at a zero-crossing point.

The second sampling unit 524 is configured to sample the first alternating current signal.

In some embodiments, the operational mode of the load includes a phase control mode of operation for indicating that the load is operating in a power variable state. As shown in FIG. 17, the sampling module 52 includes a third sampling unit 525, a third transmitting unit 526, and a fourth sampling unit 527.

The third sampling unit 525 is configured to control the working mode according to the phase of the load, and sample the second alternating current signal when the phase of the alternating current signal is between the alternating zero crossing point and the control angle of the thyristor module.

The third transmitting unit 526 is configured to control the working mode according to the phase of the load, in the AC signal When the phase is greater than the control angle of the thyristor module, a third control signal is sent to switch the thyristor module to operate during the conduction period.

The fourth sampling unit 527 is configured to sample the first alternating current signal.

In some embodiments, the operational state of the load circuit includes a load state of the load and a switching state of the thyristor module. As shown in FIG. 18, the second determining module 53 includes: a first determining unit 531, a second determining unit 532, a third determining unit 533, and a fourth determining unit 534.

The first determining unit 531 is configured to determine that the switch state is an abnormal state or the load state is an abnormal state when the thyristor module is in a deadline and the second alternating current signal is at a low level.

The second determining unit 532 is configured to determine that the switch state is a normal state and the load state is a normal state, in a case where the thyristor module is in a deadline and the second alternating current signal is at a high level.

The third determining unit 533 is configured to determine that the switch state is a normal state when the thyristor module is in the on period and the first alternating current signal is at the low level.

The fourth determining unit 534 is configured to determine that the switch state is an abnormal state when the thyristor module is in the on period and the first alternating current signal is at the high level.

The device embodiment and the foregoing embodiments are based on the same concept, and the content of the device embodiment may refer to the foregoing embodiments, and the details are not described herein.

As another aspect of the embodiments of the present application, an embodiment of the present application provides a load detection method. The function of the load detection method of the embodiment of the present application is performed by the software system of the load detecting device described above with reference to FIGS. 14 to 18, which can also be performed by means of a hardware platform. For example, the load detection method can be executed in an electronic device of a suitable type of processor having a computing capability, such as a single chip microcomputer, a digital signal processing (DSP), a programmable logic controller (PLC), or the like. .

The functions corresponding to the load detecting methods of the following embodiments are stored in the form of instructions on the memory of the electronic device, and the load detecting method corresponding to each of the following embodiments is executed. The function of the electronic device processor accesses the memory, retrieves and executes the corresponding instructions to implement the functions corresponding to the load detection methods of the various embodiments described below.

The memory is a non-volatile computer readable storage medium, and is usable for storing non-volatile software programs, non-volatile computer-executable programs, and modules, such as program instructions corresponding to the load detecting device 50 in the above embodiment. Modules (eg, the various modules and units described in Figures 14-18), or steps corresponding to the load detection methods of the embodiments described below. The processor executes various functional applications and data processing of the load detecting device 50 by running non-volatile software programs, instructions, and modules stored in the memory, that is, implementing various modules and units of the load detecting device 50 of the following embodiment. The function, or the function of the steps corresponding to the load detection method of the following embodiment.

The memory may include a high speed random access memory, and may also include a non-volatile memory such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, the memory optionally includes a memory remotely located relative to the processor, the remote memory being connectable to the processor over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

The program instructions/modules are stored in the memory, and when executed by the one or more processors, perform the load detection method in any of the above method embodiments, for example, performing FIG. 19 described in the following embodiments. The various steps shown in Figure 23; the functions of the various modules and units described in Figures 14 through 18 can also be implemented.

The load detection method is applied to the load circuit, and the load circuit may be the load circuit described in the above embodiments, and details are not described herein. Referring to FIG. 19, the load detection method 60 includes:

Step 61: Determine a working mode of the load.

Step 62: sample a current detection signal flowing through the load according to a working mode of the load;

In step 62, the working state of the thyristor module includes a conduction period or a deadline period, and the current detection signal includes a first alternating current signal or a second alternating current signal, and the first alternating current signal is in a working state of the thyristor module. When sampling is obtained, the second AC signal is obtained when the working state of the thyristor module is a deadline;

Step 63: Determine the load according to the current detection signal and the working state of the thyristor module. The working state of the loop.

Therefore, it can flexibly configure the corresponding load detection control logic according to the working mode of the load.

In some embodiments, the operational mode of the load includes a full wave mode of operation and the full wave mode of operation is used to indicate that the load is operating in a full power state. As shown in FIG. 20, step 62 includes:

Step 621: According to the full-wave operation mode of the load, when the phase of the AC signal is at a zero-crossing point, the first control signal is sent to switch the thyristor module to operate in a deadline;

Step 623: Sample the second alternating current signal.

In some embodiments, as shown in FIG. 21, step 62 further includes:

Step 622: According to the full-wave operation mode of the load, when the phase of the AC signal is at a zero-crossing point, the second control signal is sent to switch the thyristor module to work in the conduction period;

Step 624: Sample the first alternating current signal.

The difference from the above embodiments is that the working mode of the load includes a phase control working mode, and the phase control working mode is used to indicate that the load operates in a power variable state. As shown in Figure 22, step 62 includes:

Step 625: According to the phase control working mode of the load, sampling the second alternating current signal when the phase of the alternating current signal is between the alternating zero crossing point and the control angle of the thyristor module.

Step 627: According to the phase control working mode of the load, when the phase of the AC signal is greater than the control angle of the thyristor module, send a third control signal to switch the thyristor module to work in the conduction period;

Step 629: sampling the first alternating current signal.

In some embodiments, the operational state of the load circuit includes a load state of the load and a switching state of the thyristor module. As shown in FIG. 23, step 63 includes:

Step 631: When the thyristor module is in the deadline and the second AC signal is at the low level, determining that the switch state is an abnormal state or the load state is an abnormal state;

Step 632: When the thyristor module is in the deadline and the second AC signal is at the high level, determining that the switch state is a normal state, and the load state is a normal state;

Step 633, determining that the switch state is a normal state when the thyristor module is in an on-period and the first AC signal is at a low level;

Step 634: When the thyristor module is in the on period and the first alternating current signal is at the high level, determining that the switch state is an abnormal state.

The method embodiment and the foregoing embodiments are based on the same concept, and the content of the method embodiment may refer to the foregoing embodiments, and the details are not described herein.

As still another aspect of the embodiments of the present application, an embodiment of the present application provides a non-transitory computer readable storage medium storing computer executable instructions, the computer executable instructions A method for causing an electronic device to perform the load detection method according to any one of the items.

It can flexibly configure the corresponding load detection control logic according to the working mode of the load.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and are not limited thereto; in the idea of the present application, the technical features in the above embodiments or different embodiments may also be combined. The steps may be carried out in any order, and there are many other variations of the various aspects of the present application as described above, which are not provided in the details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, The skilled person should understand that the technical solutions described in the foregoing embodiments may be modified, or some of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the embodiments of the present application. The scope of the technical solution.

Claims (14)

A load detection method is applied to a load circuit, the load circuit includes a thyristor module and a load, and the thyristor module is connected in series with the load, wherein the method includes: Determining an operating mode of the load; And sampling, according to the working mode of the load, a current detecting signal flowing through the load, the working state of the thyristor module includes an on period or a deadline, and the current detection signal includes a first alternating current signal or a second alternating current a signal, the first AC signal is obtained when the working state of the thyristor module is an on-time, and the second AC signal is sampled when the working state of the thyristor module is a deadline; Determining an operating state of the load circuit based on the current detection signal and an operating state of the thyristor module. The method of claim 1 wherein the operating mode of the load comprises a full wave mode of operation, the full wave mode of operation for indicating that the load is operating in a full power state; The sampling the current detection signal flowing through the load according to the working mode of the load, including: According to the full-wave mode of operation of the load, when the phase of the AC signal is at a zero-crossing point, the first control signal is sent to switch the thyristor module to operate in a deadline; Sampling the second alternating current signal. The method according to claim 2, wherein the sampling the current detection signal flowing through the load according to the working mode of the load further comprises: According to the full-wave mode of operation of the load, when the phase of the AC signal is at a zero-crossing point, the second control signal is sent to switch the thyristor module to operate during the on-time; Sampling the first alternating current signal. The method of claim 1 wherein the operating mode of the load comprises a phase control mode of operation for indicating that the load is operating in a power variable state; The sampling the current detection signal flowing through the load according to the working mode of the load, including: And according to the phase control mode of operation of the load, sampling the second alternating current signal when the phase of the alternating current signal is between an alternating current zero crossing point and a control angle of the thyristor module. The method according to claim 4, wherein the sampling the current detection signal flowing through the load according to the working mode of the load further comprises: And transmitting, according to a phase control operation mode of the load, a third control signal to switch the thyristor module to operate during an on period when a phase of the alternating current signal is greater than a control angle of the thyristor module; Sampling the first alternating current signal. The method according to any one of claims 1 to 5, wherein the operating state of the load circuit comprises a load state of the load and a switching state of the thyristor module; Determining an operating state of the load circuit according to the current detection signal and an operating state of the thyristor module, including: In a case that the thyristor module is in a deadline and the second alternating current signal is at a low level, determining that the switch state is an abnormal state or the load state is an abnormal state; When the thyristor module is in a deadline and the second alternating current signal is at a high level, determining that the switch state is a normal state, and the load state is a normal state; When the thyristor module is in an on period and the first alternating current signal is at a low level, determining that the switch state is a normal state; In a case where the thyristor module is in an on period and the first alternating current signal is at a high level, the switch state is determined to be an abnormal state. A load detection circuit is applied to a load circuit, the load circuit includes a thyristor module and a load, and the thyristor module is connected in series with the load, wherein the load detection circuit includes: a conversion module, configured to be connected in parallel with the thyristor module, and the conversion module is configured to sample a current detection signal flowing through the load circuit, and an operating state of the thyristor module includes a conduction period or a deadline period, The current detection signal includes a first alternating current signal or a second alternating current signal The first AC signal is obtained by sampling when the working state of the thyristor module is an on-time, and the second AC signal is sampled when the working state of the thyristor module is a cut-off period; a control module, coupled to the conversion module, and configured to send a control signal to the thyristor module and receive the current detection signal; The control module includes: At least one processor; a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, the instructions being executed by the at least one processor to cause the at least one processing The device can be used to perform the load detecting method according to any one of claims 1 to 6. The load detecting circuit according to claim 7, wherein The thyristor module includes a bidirectional thyristor and a trigger circuit; The triac includes a first main terminal, a second main terminal, and a control end, and the conversion module is connected between the first main terminal and the second main terminal, and the load end is opposite to the first The two main terminals are connected, the other end of the load is grounded, the control end is connected to the output end of the trigger circuit, and the input end of the trigger circuit is used for inputting a control signal. The load detection circuit according to claim 8, wherein the conversion module comprises: An optocoupler unit, configured to sample a current detection signal flowing through the load circuit, where an output end of the optocoupler unit is connected to the control module; And a current limiting unit configured to limit current flowing through the optocoupler unit, the current limiting unit output end being coupled to the optocoupler unit input end, the current limiting unit input end being coupled to the first main terminal. The load detecting circuit according to claim 9, wherein the photocoupler unit comprises a first optocoupler and a first resistor, and one end of the first photocoupler is connected to the current limiting unit, The other end of the first photocoupler is connected to the second main terminal, and one end of the first optocoupler is connected to an external power source, and the other end of the first optocoupler is respectively connected to the first One end of the resistor is connected to the control module, and the other end of the first resistor is grounded. The load detecting circuit according to claim 9, wherein the conversion module further comprises: a protection unit connected to the second main terminal, and between the current limiting unit and the optocoupler unit Between the first nodes, the input voltage of the optocoupler unit is clamped. The load detecting circuit according to claim 9, wherein the optocoupler unit comprises a second optocoupler, a third optocoupler, a second resistor, and a third resistor; One end of the second optical coupling primary side is connected to the current limiting unit, and the other end of the second optical coupling primary side is connected to one end of the third optical coupling secondary side, and the second optical coupling secondary side One end of the second photocoupler is connected to one end of the second resistor and the control module, and the other end of the second resistor is grounded, the third optocoupler is connected to the external power supply. The other end of the secondary side is connected to the second main terminal, one end of the third optical coupling primary side is connected to one end of the third resistor, and the other end of the third resistor is connected to an external power source, the first The other end of the three optocoupler primary side is connected to the control module. A load detecting circuit according to claim 12, wherein The instructions are executed by the at least one processor to enable the at least one processor to also be operative to: Sending a fourth control signal to the third optocoupler to switch the third optocoupler to a different operating state. An electronic device comprising the load detecting circuit according to any one of claims 7 to 13.

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