CN102832078A - Contactor control device, contactor control system and contactor control method - Google Patents

Abstract

The invention provides a contactor control device, a system and a contactor control method. The device includes: a high-voltage control circuit with a high-voltage control input terminal, the high-voltage control circuit is used for conducting or disconnecting under the control signal input from the high-voltage control input terminal, and when the high-voltage control circuit is conducting, it provides the first contactor A voltage to control contactor switching; the low-voltage control circuit has a low-voltage control input terminal, and the low-voltage control circuit is used to turn on or off under the control signal input from the low-voltage control input terminal, and when the low-voltage control circuit is turned on, Provide the second voltage for the contactor, control the contactor to maintain the switching state, the second voltage is lower than the first voltage; the high-voltage control circuit is connected with a fool-proof circuit, which is used to automatically disconnect the high-voltage control circuit after the high-voltage control circuit is turned on The first voltage applied to the contactor. In the embodiment of the present invention, in the process of controlling the contactor, the high voltage applied to the contactor can be disconnected in time after the contactor is switched.

Description

Contactor control device, system and contactor control method

technical field

The embodiment of the present invention relates to a contactor control technology, in particular to a contactor control device, system and contactor control method.

Background technique

A contactor is a common switching device, which mainly includes a coil, a normally open contact and a normally closed contact. By applying a certain voltage to the coil, the normally open contact can be controlled to close and the normally closed contact to open. Among them, The normally open contact and the normally closed contact are arranged in pairs. When the normally open contact is closed, the normally closed contact is opened to control the closing of the normally open contact of the contactor, also known as switching of the contactor.

At present, in order to improve the reliability of contactor switching, the method of high-voltage switching and low-voltage maintenance is usually adopted when switching the contactor, that is, when the contactor is switching, the coil of the contactor is provided with high The high voltage is used to ensure reliable switching of the contactor. After the switching of the contactor is completed, the high voltage is disconnected, and the low voltage is used to maintain the contactor in the switching state. In the process of contactor switching control in the prior art, the controller controls the high-voltage control circuit and the low-voltage control circuit to provide high voltage and low voltage to the contactor respectively, so that the high voltage can be used to control the reliable switching of the contactor, and the contactor is detected. After the switch is switched, the controller can control the high-voltage control circuit to stop providing high voltage to the contactor, and the contactor can maintain the switching state under the action of the low voltage provided by the low-voltage control circuit, so as to avoid the coil in the contactor being exposed to high voltage for a long time damaged by overheating.

However, in the existing contactor switching control process, if the controller is abnormal, for example, the controller cannot detect the contactor switching, the high-voltage control circuit will always be in the conduction state, and the high voltage will always be applied to the contactor. On the coil, the coil of the contactor is damaged due to overheating.

Contents of the invention

The embodiment of the present invention provides a contactor control device, system and contactor control method, which can cut off the high voltage applied to the contactor in time after the contactor switching is completed, so as to prevent the coil of the contactor from being damaged due to high voltage being applied for a long time. Overheating damage occurs.

An embodiment of the present invention provides a contactor control device, including:

The high-voltage control circuit has a high-voltage control input terminal, and the high-voltage control circuit is used to turn on or off under the control signal input from the high-voltage control input terminal, and when the high-voltage control circuit is turned on, it is a contactor providing a first voltage to control switching of the contactor;

The low-voltage control circuit has a low-voltage control input terminal, and the low-voltage control circuit is used to turn on or off under the action of the control signal input from the low-voltage control input terminal, and when the low-voltage control circuit is turned on, it is a contactor providing a second voltage to control the contactor to maintain a switching state, the second voltage being lower than the first voltage;

The high-voltage control circuit is connected with a fool-proof circuit for automatically disconnecting the first voltage applied to the contactor by the high-voltage control circuit after the high-voltage control circuit is turned on.

The embodiment of the present invention also provides a contactor control system, including:

The contactor control device and the contactor provided by the above-mentioned embodiments of the present invention;

The contactor is connected to the output ends of the high voltage control circuit and the low voltage control circuit.

An embodiment of the present invention further provides a contactor control method, including:

providing control signals for the high-voltage control circuit and the low-voltage control circuit, controlling the high-voltage control circuit and the low-voltage control circuit to respectively apply a first voltage and a second voltage to the contactor, the first voltage being greater than the second voltage;

Using the fool-proof circuit connected to the high-voltage control circuit, after the contactor is switched under the action of the first voltage and the second voltage, it is automatically disconnected and applied to the contactor through the high-voltage control circuit of the first voltage.

In the contactor control device, system and contactor control method provided by the embodiments of the present invention, a fool-proof circuit is provided on the high-voltage control circuit that provides high voltage for the contactor, so that the contactor can be automatically disconnected and passed through the high-voltage control circuit after switching. The high voltage applied to the contactor can avoid overheating and damage to the contactor coil caused by the high voltage continuing to be applied to the contactor after switching the contactor. On the basis of ensuring reliable switching of the contactor, it can effectively improve the working efficiency of the contactor. stability and reliability.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a contactor control device provided by Embodiment 1 of the present invention;

Fig. 2 is a schematic structural diagram of a contactor control device provided in Embodiment 2 of the present invention;

FIG. 3 is a schematic structural diagram of a specific circuit of a contactor control device provided in Embodiment 3 of the present invention;

Fig. 4 is a schematic structural diagram of a contactor control device provided in Embodiment 4 of the present invention;

5 is a schematic diagram of the level waveforms of the input and output terminals of the signal detection control circuit in an embodiment of the present invention;

6 is a schematic structural diagram of the signal detection control circuit in the contactor control device provided by Embodiment 5 of the present invention;

Fig. 7 is a schematic structural diagram of a contactor control device provided in Embodiment 6 of the present invention;

Fig. 8 is a schematic structural diagram of a contactor control system provided by Embodiment 7 of the present invention;

FIG. 9 is a schematic structural diagram of a contactor control system provided by Embodiment 7 of the present invention;

FIG. 10 is a schematic flowchart of a contactor control method provided in Embodiment 8 of the present invention;

FIG. 11 is a schematic flow chart of a contactor control method provided in Embodiment 9 of the present invention;

FIG. 12 is a schematic flowchart of a method for controlling a contactor provided by Embodiment 10 of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are the Some, but not all, embodiments are invented. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

FIG. 1 is a schematic structural diagram of a contactor control device provided by Embodiment 1 of the present invention. As shown in Figure 1, the contactor control device 1 of this embodiment includes: a high-voltage control circuit 11 and a low-voltage control circuit 12, wherein:

The high-voltage control circuit 11 has a high-voltage control input terminal 111. The high-voltage control circuit 11 can be turned on or off under the action of the control signal Vc1 input from the high-voltage control input terminal 111, and when the high-voltage control circuit 11 is turned on, it can be a contactor 2. Provide the first voltage, that is, the high voltage V1, so that the contactor 2 can be switched under the action of the high voltage V1;

The low-voltage control circuit 12 has a low-voltage control input terminal 121. The low-voltage control circuit 12 can be turned on or off under the control signal Vc2 input from the low-voltage control input terminal 121, and when the low-voltage control circuit 12 is turned on, the contactor 2 is provided. The second voltage, that is, the low voltage V2, enables the contactor 2 to maintain the switching state at the low voltage V2;

The high-voltage control circuit 11 is connected with a fool-proof circuit 13, and the fool-proof circuit 13 can automatically disconnect the high voltage V1 applied to the contactor 2 by the high-voltage control circuit 13 after the high-voltage control circuit 11 is turned on.

The contactor control device 1 of this embodiment can control the switching of the contactor 2. Specifically, the contactor control device 1 can be a coil in the contactor 2 under the action of an external control device, such as a control signal input by a controller. 21 provides high voltage and low voltage to control the switching of the contactor 2; at the same time, after the switching of the contactor 2 is completed, the high voltage control circuit 13 can be automatically disconnected through the foolproof circuit 13, so that the high voltage control circuit 13 can be applied The high voltage V1 on the coil 21 of the contactor 2 is disconnected to prevent the coil 21 from being overheated and damaged by applying a high voltage for a long time, while the low voltage V2 will always be applied to the contactor 2 to maintain the switching state of the contactor 2 .

Those skilled in the art can understand that when the coil 21 of the contactor 2 is supplied with a high voltage V1, the normally closed contact 22 of the contactor 2 is opened, and the normally open contact 23 is disconnected, so that the contactor 2 can be switched. . Compared with the low voltage V2, the high voltage V1 can generate a larger magnetic field when applied to the coil 21, so the switching of the contactor 2 can be reliably completed. After the switching of the contactor 2 is completed, the low voltage can be used. V2 maintains the switching action.

Those skilled in the art can understand that in the various embodiments of the present invention described above, the high voltage V1 and the low voltage V2 are common names for relative voltages. For different contactors, the high voltage V1 and the low voltage V2 will be different. For example, the high voltage V1 can be 180V, the low voltage V2 can be 12V, or the high voltage V1 can also be 300V, and the low voltage can be 15V, etc. In practical applications, the high voltage V1 and the low voltage V2 of appropriate voltages can be set according to the type of contactor and the like.

To sum up, the contactor control device provided by this embodiment sets a fool-proof circuit on the high-voltage control circuit that provides high voltage for the contactor, so that the contactor can be automatically disconnected after switching and applied to the contactor through the high-voltage control circuit. High voltage, to avoid contactor coil overheating damage caused by high voltage continued to be applied to the contactor after switching the contactor, on the basis of ensuring reliable switching of the contactor, it can effectively improve the stability and reliability of the contactor sex.

FIG. 2 is a schematic structural diagram of a contactor control device provided by Embodiment 2 of the present invention. In this embodiment, the fool-proof circuit connected to the high-voltage control circuit can be a normally closed contact on the contactor. Specifically, as shown in FIG. 2, in the contactor control device 1 of this embodiment, the high-voltage control circuit 11 can specifically be include:

The first switch circuit 112 and the first electromagnetic relay switch circuit 113, wherein the first switch circuit 112 can turn on the first electromagnetic relay switch circuit 113 under the action of the high-voltage level signal input from the high-voltage control input terminal 111, The high voltage V1 is applied to the coil 21 of the contactor 2 through the first electromagnetic relay switch circuit 113 .

Similarly, the low-voltage control circuit 12 can have a second switch circuit 122 and a second electromagnetic relay switch circuit 123, wherein the second switch circuit 122 can be turned on under the action of a high-voltage level signal input from the low-voltage control input terminal 121 The second electromagnetic relay switch circuit 123 makes the low voltage V2 applied to the coil 21 of the contactor 2 through the second electromagnetic relay switch circuit 123 .

The fool-proof circuit is connected in series with the output end of the high-voltage control circuit 11, that is, the normally closed contact 22 of the contactor 2 at the output end of the above-mentioned first electromagnetic relay switch circuit 113, so that when the high voltage V1 is applied to the high-voltage control circuit 11 On the coil 21 of the contactor 2, the normally open contact 23 of the contactor 2 is closed, that is, when the contactor 2 is switched, the normally closed contact 22 of the contactor 2 will be opened, and at this time, the high voltage control circuit 11 will be The coil 21 of the contactor 2 is disconnected, and the high voltage V1 applied to the coil 21 is disconnected.

In this embodiment, two ports connected to the two ends of the normally closed contact 22 can be provided at the output end of the high voltage control circuit 11. When the contactor 2 needs to be controlled, the normally closed contact can be connected through these two ports. Head 22 makes the normally closed contact 22 as a fool-proof circuit.

In practical applications, the normally closed contact 22 can also be connected in series to the input end of the high voltage control circuit 11, that is, connected in series to the high voltage control input end 111. When the contactor 2 is switched under the action of the high voltage V1, the contactor 2 The normally closed contact 22 of 2 will open, at this time, the high level signal input to the high voltage control input terminal 111 will be blocked, the high voltage control circuit 11 will be disconnected, and the high voltage V1 applied to the coil 21 is also disconnected. Correspondingly, the two ports connected to the two ends of the normally closed contact 22 can be set at the input end of the high voltage control circuit 11 . Those skilled in the art can understand that the normally closed contact 22 can also be connected in series with other positions of the high voltage control circuit 11 as long as the high voltage V1 applied to the contactor 2 can be disconnected.

FIG. 3 is a schematic structural diagram of a specific circuit of a contactor control device provided by Embodiment 3 of the present invention. On the basis of the technical solution of the embodiment shown in FIG. 2 above, as shown in FIG. 3 , the first switch circuit 112 may specifically be a triode switch circuit, such as the triode Q1 and related auxiliary capacitor C1 and resistor R1 shown in FIG. 3 ; An electromagnetic relay switch circuit 113 is specifically an electromagnetic relay circuit, such as the electromagnetic relay K1 and the auxiliary diode D1 shown in Figure 2; the high voltage V1 is connected to the port 3 of the electromagnetic relay K1, and the port 2 of the electromagnetic relay K1 is connected to the contactor 2 The coil 21 is connected, the port 1 of the electromagnetic relay K1, that is, one end of the coil of the electromagnetic relay K1 is connected to a voltage V0, and the port 5 of the electromagnetic relay K1, that is, the other end of the coil of the electromagnetic relay K1 is connected to the collector C of the transistor Q1; A resistor R and a capacitor C may also be connected between the high voltage V1 and the electromagnetic relay K1 to form an auxiliary circuit. Among them, V0 is applied to the coil of the electromagnetic relay K1 to control the normally open contact therein to connect port 2 and port 3; the base B of the triode Q1 is the above-mentioned high-voltage control input terminal.

Specifically, as shown in Figure 3, when the input terminal of the triode Q1, that is, the base B, is connected with a high-level signal Vc1, the triode Q1 is turned on, and then V0 will be applied to the coil of the electromagnetic relay K1, so that the electromagnetic relay K1 The normally open contact of the contactor 2 is connected to port 2 and port 3, so that the high voltage V1 will be applied to the coil 21 of the contactor 2, and the normally open contact 23 of the contactor 2 is controlled to close, and the contactor 2 is switched.

Those skilled in the art can understand that the above-mentioned triode Q1, electromagnetic relay K1, capacitors, resistors, diodes, etc. can be selected according to actual needs. Wherein, the electromagnetic relay K1 may be a conventional electromagnetic relay, and its specific working principle will not be repeated here.

In this embodiment, as shown in FIG. 3, the above-mentioned second switch circuit 122 and second electromagnetic relay switch circuit 123 may have a circuit structure similar to that of the above-mentioned first switch circuit 112 and first electromagnetic relay switch circuit 113, I won't repeat them here.

In this embodiment, as shown in FIG. 3, the voltage V0 applied to the port 1 of the electromagnetic relay K1 in the first electromagnetic relay switch circuit 113 and the electromagnetic relay K2 in the second electromagnetic relay switch circuit 123 can be passed by V0' The filter circuit is obtained, and the filter circuit can be composed of a capacitor C connected in parallel and a magnetic bead B connected in series. The specific circuit implementation is the same or similar to that of the traditional filter circuit, and will not be repeated here.

In this embodiment, as shown in Figure 3, when the coil 21 of the contactor 2 is connected to the output terminals of the high-voltage control circuit 11 and the low-voltage control circuit 12, auxiliary circuits such as capacitor C and diode D are also connected to improve the voltage applied to the contactor. The stability of the coil 21 voltage of the device 2.

In this embodiment, as shown in FIG. 3 , in order to prevent the high voltage V1 applied by the high-voltage control circuit 11 on the coil 21 from affecting the low-voltage control circuit 12, a single-phase connection can be connected between the low-voltage control circuit 12 and the coil 21. circuit, such as the diode D' shown in FIG. 3 , to ensure the isolation between the high voltage control circuit 11 and the low voltage control circuit 12 .

Those skilled in the art can understand that in practical applications, capacitors and resistors of appropriate sizes and transistors and electromagnetic relays of appropriate models or specifications can be selected according to needs, and the embodiments of the present invention are not particularly limited here.

Those skilled in the art can understand that in practical applications, in addition to the specific circuit realization of the high-voltage control circuit and low-voltage control circuit shown in Figure 3 above, it can also be realized by other conventional voltage control circuits, as long as it can be controlled by the control signal It only needs to be able to provide a voltage for the contactor, and details will not be repeated here.

FIG. 4 is a schematic structural diagram of a contactor control device provided by Embodiment 4 of the present invention. The difference from the technical solution of the above-mentioned embodiment shown in Fig. 2 and Fig. 3 is that the fool-proof circuit in this embodiment is a signal detection control circuit 14 connected in series to the high-voltage control input end 111 of the high-voltage control circuit 11, and the signal detection control circuit 14 The circuit 14 can be used to detect the control signal input from the high-voltage control input terminal 111, and output a high pulse signal with a preset pulse width when the input control signal is detected to be a high level signal.

In this embodiment, when the signal detection control circuit 14 detects that a high-level signal is input to the high-voltage control input terminal 111, the high-level signal can be converted into a high-pulse signal. Under the action of conduction, the high voltage V1 will be applied to the coil 21 of the contactor 2, so that the contactor 2 will be switched, and when the high pulse signal changes from high level to low level, the high voltage control circuit 11 will be disconnected , at this time, the high voltage V1 will be disconnected from the coil 21. Therefore, after using the high pulse signal to control the switching of the contactor 2, the high voltage V1 can be automatically disconnected, so that the contactor 2 can be used at the low voltage applied by the low voltage control circuit 12. The switching state is maintained under the action of voltage V2.

Those skilled in the art can understand that the high level of the above-mentioned high pulse signal is the same as the high level signal input by the high voltage control input terminal 111, and has a certain pulse width, which can be preset according to actual needs. The size of the pulse width can be set as long as the maintaining time of the high level can ensure the switching of the contactor 2. The actual size can be determined according to the conduction time of the high voltage control circuit 11 and the switching time of the contactor 2.

FIG. 5 is a schematic diagram of the level waveforms of the input terminal and the output terminal of the signal detection control circuit in the embodiment of the present invention. As shown in Figure 5, when the signal detection control circuit 14 detects that the control signal input to the high-voltage control input terminal 111 is a high-level signal A1, it will output a high-pulse signal A2. The input high level signal is converted into a high pulse signal output. Those skilled in the art can understand that when the signal detection control circuit 14 detects that the control signal is a low-level signal, it does not perform any processing, and its output level is also a low-level signal.

FIG. 6 is a schematic structural diagram of a signal detection control circuit in a contactor control device provided in Embodiment 5 of the present invention. On the basis of the technical solution of the above embodiment shown in FIG. 4, as shown in FIG. 6, the signal detection control circuit 14 in this embodiment may specifically include a signal detection unit 141 and a signal output control unit 142, wherein:

A signal detection unit 141, configured to detect the input level signal of the high voltage control input terminal;

The signal output control unit 142 is configured to output a high pulse signal when the input level signal detected by the signal detection unit 141 is a high level signal.

In this embodiment, the signal detection control circuit 14 can detect the input level of the high voltage control input terminal in real time through the signal detection unit 141 , and can convert the input high level into a high pulse signal output by the signal output control unit 142 .

Those skilled in the art can understand that in the actual application of the contactor control device shown in Fig. 1-Fig. The conduction or disconnection of the control circuit and the low-voltage control circuit, that is, the contactor control device of this embodiment can exist independently as an independent device.

In addition, the contactor control device in this embodiment can also integrate the functions of the controller, which will be described with a specific example below.

Fig. 7 is a schematic structural diagram of a contactor control device provided by Embodiment 6 of the present invention. On the basis of the technical solution of any one of the embodiments shown in Fig. 1-Fig. 4 and Fig. 6 above, as shown in Fig. 7, the control device of this embodiment can also be provided with a control module 10, which can be used to control the The input terminal 111 and the low-voltage control input terminal 121 send control signals Vc1 and Vc2 respectively, and the control signals are high-level signals or low-level signals.

In this embodiment, when it is necessary to control the switching of the contactor 2, the control module 10 can send high-level signals to the high-voltage control input terminal 111 and the low-voltage control input terminal 121 respectively, so that the high voltage V1 and the low voltage V2 can be controlled. The high voltage control circuit 11 and the low voltage control circuit 12 are respectively applied to the coil 21 of the contactor 2, so that the contactor 2 can be reliably switched under the action of the high voltage V1; at the same time, the control module 10 can also be used to detect the contactor 2 Whether the switching is successful, and when the contactor is successfully switched, the control signal sent to the high-voltage control input terminal 111 is cleared to 0 or switched to a low-level signal, and the high-voltage control circuit 11 is disconnected, so that the voltage applied to the contactor 2 The high voltage on V1 is disconnected.

Those skilled in the art can understand that the control module 10 can specifically be a microprocessor, which can send control signals according to user instructions to control the operation of the high-voltage control circuit 11 and the low-voltage control circuit 12 to control the switching of the contactor 2 .

Those skilled in the art can understand that in the various embodiments of the present invention described above, the high-level signal and the low-level signal as the control signal are common names for a relative voltage. Generally speaking, the voltage of the high-level signal can be 3V, 3.3V, 5V or others, and the corresponding low-level signal can be a voltage lower than the high-level signal, such as 0V, 0.5V and so on. For those skilled in the art, according to actual circuit conditions, a high-level signal and a low-level signal of a certain voltage can be set in a control circuit.

FIG. 8 is a schematic structural diagram of a contactor control system provided by Embodiment 7 of the present invention. As shown in Figure 8, the contactor control system of this embodiment may include the contactor control device 1 shown in Figure 1-4 and Figure 6, and the contactor 2, the contactor 2 is connected to the high-voltage control device For the output terminals of the circuit 11 and the low-voltage control circuit 12, the specific structure of the contactor control device 1 can be seen in the above-mentioned Fig. 1-4 and Fig. 6, and will not be repeated here.

In this embodiment, the contactor control device 1 can also be connected with a controller 3, which can be a control device such as a CPU, and can send a control signal to the contactor control device 1, so that the high-voltage control circuit 11 and the low-voltage control circuit 12, and then control the switching of the contactor 2, its specific implementation can refer to the above-mentioned description of the embodiment of the contactor control device of the present invention, and will not be repeated here.

FIG. 9 is a schematic structural diagram of a contactor control system provided by Embodiment 7 of the present invention. Different from the system embodiment shown in Figure 7 above, the contactor control device 1' of this embodiment can adopt the contactor control device shown in Figure 7 above, and the contactor control device 1' is integrated with a control module, and its specific The structure can be referred to above as shown in FIG. 7 , and will not be repeated here.

FIG. 10 is a schematic flowchart of a method for controlling a contactor provided in Embodiment 8 of the present invention. As shown in Figure 10, the contactor control method in this embodiment may include the following steps:

Step 101, providing control signals for the high-voltage control circuit and the low-voltage control circuit, and controlling the high-voltage control circuit and the low-voltage control circuit to respectively apply a first voltage and a second voltage to the contactor, wherein the first voltage is greater than the second voltage;

Step 102, using the fool-proof circuit connected to the high-voltage control circuit to automatically disconnect the first voltage applied to the contactor through the high-voltage control circuit after switching the contactor under the action of the first voltage and the second voltage.

The method of the embodiment of the present invention can be implemented based on the contactor control device provided by the above-mentioned embodiment of the present invention. For the specific implementation process, refer to the description of the above-mentioned device embodiment of the present invention, and will not be repeated here.

FIG. 11 is a schematic flowchart of a method for controlling a contactor provided by Embodiment 9 of the present invention. This embodiment can be realized based on the above-mentioned contactor control device shown in Figure 2 and Figure 3, wherein the fool-proof circuit is a switch contact connected in series in the high-voltage control circuit, and the switch contact is a normal contactor in the contactor. To close the contact, specifically, as shown in Figure 11, the method for controlling the contactor in this embodiment may include the following steps:

Step 201, providing control signals for the high-voltage control circuit and the low-voltage control circuit, and controlling the high-voltage control circuit and the low-voltage control circuit to respectively apply a first voltage and a second voltage to the contactor, wherein the first voltage is greater than the second voltage;

Step 202: After the contactor is switched under the action of the first voltage and the second voltage, use the normally closed contact on the contactor in the disconnected state to automatically disconnect the electrical connection between the high-voltage control circuit and the contactor, thereby The first voltage applied to the contactor through the high voltage control circuit is automatically disconnected.

This embodiment can control the switching of the contactor based on the contactor control device provided by the embodiment shown in Figure 2 and Figure 3 above, and its specific implementation process can refer to the description of the embodiment shown in Figure 2 and Figure 3 above , which will not be repeated here.

FIG. 12 is a schematic flowchart of a method for controlling a contactor provided by Embodiment 10 of the present invention. This embodiment can be realized based on the above-mentioned contactor control device shown in Figure 4, Figure 5, and Figure 6, wherein the fool-proof circuit is a signal detection control circuit connected in series to the input end of the high-voltage control circuit, specifically, as shown in Figure As shown in 12, the contactor control method in this embodiment may include the following steps:

Step 301, providing control signals for the high-voltage control circuit and the low-voltage control circuit, and controlling the high-voltage control circuit and the low-voltage control circuit to respectively apply a first voltage and a second voltage to the contactor, wherein the first voltage is greater than the second voltage;

Step 302: After the signal detection control circuit detects the control signal input from the input terminal of the high-voltage control circuit, output a high pulse signal with a preset pulse width to control the high-voltage control circuit to provide the first voltage with a preset pulse width and duration to the contactor switch, so that the contactor automatically disconnects the first voltage applied to the contactor through the high-voltage control circuit after switching under the action of the first voltage and the second voltage with a preset pulse width.

This embodiment can control the switching of the contactor based on the contactor control device provided in the above-mentioned embodiment shown in Figure 4, Figure 5 and Figure 6, and its specific implementation process can be referred to the above-mentioned Figure 4, Figure 5 and Figure 6 The description of the illustrated embodiment will not be repeated here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the technical solutions of the various embodiments of the present invention. scope.

Claims (13)

1. a contactor control device is characterized in that, comprising:

High-voltage control circuit; Have the high voltage control input, said high-voltage control circuit is used for conducting or disconnection under the control signal effect of said high voltage control input input, and when said high-voltage control circuit conducting; For contactor provides first voltage, control said contactor switching;

Low-voltage control circuit; Has the low voltage control input; Said low-voltage control circuit is used for conducting or disconnection under the control signal effect of said low voltage control input input, and when said low-voltage control circuit conducting, for contactor provides second voltage; Control said contactor and keep the switching state, said second voltage is lower than said first voltage;

Said high-voltage control circuit is connected with the fool proof circuit, is used for after said high-voltage control circuit conducting, and the said high-voltage control circuit of automatic disconnection is applied to first voltage on the said contactor.

2. contactor control device according to claim 1 is characterized in that, said fool proof circuit is the switch contact that is connected in the said high-voltage control circuit;

Said switch contact is the normally closed interlock in the contactor.

3. contactor control device according to claim 1 is characterized in that, said fool proof circuit is the input control circuit that is serially connected in said high voltage control input;

Said input control circuit, when being used to detect said high voltage control input input high level signal, the high pulse signal that output has preset pulsewidth.

4. contactor control device according to claim 3 is characterized in that, said input control circuit comprises:

Detecting signal unit is used to detect the incoming level signal of said high voltage control input;

The signal output control unit when being used for incoming level signal that said detecting signal unit detects and being high level signal, is exported said high pulse signal.

5. contactor control device according to claim 1 is characterized in that, also comprises:

Control module is used for transmitting control signal respectively to said high voltage control input and low voltage control input, and said control signal is high level signal or low level signal.

6. contactor control device according to claim 5; It is characterized in that, said control module, whether switching is successful also to be used to detect said contactor; And when the success of said contactor switching, with the control signal that is sent to said high voltage control input clear 0 or switch to low level signal.

7. according to the arbitrary described contactor control device of claim 1-6, it is characterized in that said high-voltage control circuit comprises:

First switching circuit is used for conducting or disconnection under the control signal effect of said high voltage control input input;

The first electromagnetism relay switch circuit is used for when the said first switching circuit conducting, said first voltage being offered on the said contactor.

8. contactor control device according to claim 7 is characterized in that, said low-voltage control circuit comprises:

The second switch circuit is used for conducting or disconnection under the control signal effect of said low voltage control input input;

The second electromagnetism relay switch circuit is used for when said second switch circuit turn-on, said second voltage being offered on the said contactor.

9. contactor control device according to claim 7 is characterized in that, said first switching circuit is a transistor switching circuit; The said first electromagnetism relay switch circuit is an electromagnetic relay.

10. a contactor control system is characterized in that, comprising:

Aforesaid right requires arbitrary described contactor control device of 1-9 and contactor;

Said contactor is connected the output of said high-voltage control circuit and low-voltage control circuit.

11. a contactor control method is characterized in that, comprising:

For high-voltage control circuit and low-voltage control circuit provide control signal, to control said high-voltage control circuit and low-voltage control circuit and apply first voltage and second voltage respectively to contactor, said first voltage is greater than said second voltage;

Utilize the fool proof circuit that is connected with said high-voltage control circuit, make said contactor behind switching under said first voltage and the second voltage effect, automatic disconnection is applied to said first voltage on the said contactor through said high-voltage control circuit.

12. contactor control method according to claim 11 is characterized in that, said fool proof circuit is the switch contact that is connected in the said high-voltage control circuit, and said switch contact is the normally closed interlock in the said contactor;

The fool proof circuit that said utilization is connected with said high-voltage control circuit, automatic disconnection comprises through said first voltage that said high-voltage control circuit is applied on the said contactor behind said contactor switching:

Said contactor is behind switching under said first voltage and the second voltage effect; Utilization is in the said normally closed interlock of off-state; Being electrically connected between the said high-voltage control circuit of automatic disconnection and the said contactor, thus automatic disconnection is applied to said first voltage on the said contactor through said high-voltage control circuit.

13. contactor control method according to claim 11 is characterized in that, said fool proof circuit is the input control circuit that is serially connected in the input of said high-voltage control circuit;

The fool proof circuit that said utilization is connected with said high-voltage control circuit makes said contactor behind switching under said first voltage and the second voltage effect, and automatic disconnection comprises through said first voltage that said high-voltage control circuit is applied on the said contactor:

After the control signal that the input that utilizes said input control circuit to detect said high-voltage control circuit is imported; The high pulse signal that output has preset pulsewidth; To control said high-voltage control circuit first voltage to the said contactor of said preset pulsewidth duration is provided; So that said contactor is behind switching under first voltage of said preset pulsewidth duration and the said second voltage effect, automatic disconnection is applied to said first voltage on the said contactor through said high-voltage control circuit.

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