CN201374586Y - A dual power switch - Google Patents

Abstract

The utility model provides a dual power switch, which comprises a main power input port, a backup power input port, an execution device and a control processor with a memory, and the control processor continuously detects the main power input through the main power input port The voltage of the backup power and the voltage of the backup power input through the backup power input port, and judge the output power according to the voltage detection result and the corresponding relationship information between the main power voltage, the backup power voltage and the output power configured in the memory, and then according to the judgment As a result, the actuator is controlled to output the output power, and the output power is the main power or the standby power. The dual power supply switcher can detect the main power supply in real time, and promptly switch the output power supply to a backup power supply when the power supply is insufficient or power-off, and the corresponding relationship information configured in the memory is easy to modify and has strong versatility.

Description

A dual power switch

technical field

The utility model relates to a power switching device, in particular to a two-way AC automatic switching device.

Background technique

At present, many industrial automation systems have high requirements on the reliability of the power supply. If there is insufficient power supply or power failure, it will cause problems such as computer equipment reset, which will seriously affect the safe operation of the controlled equipment.

At present, although there are some power switchers that can automatically switch between the main power supply and the backup power supply, most of the logic judgment parts are built by simple electrical components such as operational amplifiers, resistors, and diodes. Once completed, this type of power switch The threshold value for the switching judgment of the switch is also fixed. If it is necessary to use a power switcher suitable for switching between two AC 220V power sources to automatically switch between two AC 110V power sources, it is necessary to change the hardware circuit and replace electrical components. But this is very troublesome and its versatility is poor. Moreover, due to the time-delay characteristics of these electrical components, the delay of the main power supply and the backup power signal after being processed by these electrical components is relatively large, and there will be a problem of untimely switching, and electrical components such as resistors are greatly affected by temperature. The signal drift is relatively large.

In addition, the existing power switcher implemented by simple relays can switch to the backup power supply to supply power to the controlled equipment when the main power supply is powered off. The judgment basis for switching is generally whether the main power supply is powered off. However, in field electricity consumption, when the power supply is lost, the voltage generally drops slowly. Based on the working principle of the relay, this will make the switching circuit realized by the simple relay unable to switch quickly when the current power supply voltage is insufficient. .

Therefore, it is necessary to propose a dual power switcher to solve the above problems.

Utility model content

Based on the above shortcomings, the utility model proposes a dual power switcher, which can detect the main power supply in real time, and switch the output power supply to the backup power supply in time when the main power supply is insufficient or power-off, and has strong versatility.

In order to solve the above-mentioned technical problems, the utility model provides a dual power switch, which includes a main power input port, a backup power input port, an execution device and a control processor with a memory, and the control processor is connected to the main power input respectively. port, the backup power input port is connected to the execution device, and the execution device is respectively connected to the main power input port and the backup power input port, wherein:

The control processor continuously detects the voltage of the main power input through the main power input port and the voltage of the backup power input through the backup power input port, and according to the voltage detection result and the main power voltage and backup power voltage configured in the memory and the corresponding relationship information between the output power sources to judge the output power source, and then control the executive device to output the output power source according to the judgment result, the output power source being the main power source or the backup power source;

The executing device outputs main power or backup power under the control of the control processing module.

Further, the above-mentioned dual power switcher can also have the following characteristics:

The control processor includes a step-down rectifier circuit, a voltage sampling unit and a judgment processing unit connected in sequence, and the judgment processing unit is also connected with the memory.

Further, the above-mentioned dual power switcher can also have the following characteristics:

The step-down rectification circuit respectively performs step-down and rectification processing on the main power input through the main power input port and the backup power input through the backup power input port, and then sends them to the voltage sampling unit;

The voltage sampling unit has at least two analog/digital acquisition channels, which respectively perform AC voltage sampling on the main power supply and the backup power supply after step-down and rectification processing, and send the voltage sampling values to the judgment processing unit;

The judgment processing unit calculates the effective value of the voltage of the main power supply and the backup power supply in real time according to the received voltage sampling value, and then according to the effective value of the voltage of the main power supply and the backup power supply, as well as the voltage of the main power supply and the backup power supply configured in the memory. The corresponding relationship information of the output power judges the output power, and controls the executing device to output the main power or the standby power according to the judgment result.

Further, the above-mentioned dual power switcher can also have the following characteristics:

The control processor also contains a timer where:

When the judging processing unit controls the executive device to output the standby power, if it judges that the output power is the main power and the timer is not started, then start the timer;

If the judging processing unit judges that the output power is a standby power within the time limit of the timer, it stops and resets the timer; otherwise, when the timer expires, it controls the executive device to output the main power.

Further, the above-mentioned dual power switcher can also have the following characteristics:

The corresponding relationship information configured in the memory includes: when the output power is configured as the main power, the voltage range of the main power; and when the output power is configured as the backup power, the voltage range of the main power and the voltage range of the backup power.

Further, the above-mentioned dual power switcher can also have the following characteristics:

The execution device is a relay; the control processing module controls the relay to output main power or standby power by controlling the coil voltage of the relay.

Further, the above-mentioned dual power switcher can also have the following characteristics:

When the control processor sets the coil voltage of the relay to high level, the relay is closed to output main power; when the control processor sets the coil voltage of the relay to low level, the relay is disconnected to output standby power.

Further, the above-mentioned dual power switcher can also have the following characteristics:

Also includes an alarm processor connected to the control processor:

Alarm thresholds for mains voltage are also configured in this memory;

The control processor also judges whether to give an alarm according to the detected voltage of the main power supply and the alarm threshold configured in the memory, and sends an alarm control signal to the alarm processor if it is judged that an alarm is required;

The alarm processor issues an alarm after receiving the alarm control signal.

Further, the above-mentioned dual power switcher can also have the following characteristics:

It also includes a display module connected to the control processor, the display module includes two sets of digital tubes and/or two LED indicators, wherein:

When the control processor detects the voltage of the main power supply and the voltage of the backup power supply, it also controls two sets of digital tubes to respectively display the voltage of the main power supply and the voltage of the backup power supply detected by the control processor; and/or

When the control processor controls the executive device to output the main power supply or the backup power supply, it also controls the LED indicator light corresponding to the main power supply or the backup power supply to light up.

Further, the above-mentioned dual power switcher can also have the following characteristics:

It also includes a button or key for resetting the display module.

Further, the above-mentioned dual power switcher can also have the following characteristics:

The control processor is a single-chip microcomputer or an embedded chip.

Compared with the existing power switcher, the dual power switcher described in the utility model has the following advantages:

Locally configure and store the corresponding relationship information between the main power supply voltage, backup power supply voltage and output power for switching judgment. The corresponding relationship information is easy to modify, and can be applied to the switching of power supplies of different standards, which has strong versatility sex;

The control processing chip is used for switching judgment, which reduces the delay of switching judgment and improves the accuracy of switching;

It can detect and judge the voltage of the main power supply in real time. When it is judged that the voltage of the main power supply is insufficient or too high, it can switch to the backup power supply in time to supply power to the controlled equipment; after judging that the main power supply has been restored and ensuring its output stability The current power supply is switched to the main power supply only under certain circumstances to reduce misoperation;

When the control processor fails, it can ensure that the backup power supply can provide working voltage to the controlled equipment;

It has a display function, which can display the voltage of the main power supply and the backup power supply to the user in real time, and can also indicate the current output power supply.

It has an alarm function, which can give an alarm prompt when the voltage of the main power supply is too large.

It has a control extension port, and when the output power is insufficient, the output power can be increased by connecting an external relay through the control extension port.

Description of drawings

Fig. 1 is a structural block diagram of a dual power switcher according to an embodiment of the present invention.

Fig. 2 is a structural diagram of a step-down rectifier circuit in a dual power switcher according to an embodiment of the present invention.

Detailed ways

The utility model proposes a dual power supply switcher to realize the automatic switching of dual-channel AC power supply. Power supply or backup power supply; continuously detect the voltage of the main power supply and the backup power supply, judge the output power according to the detection result and the corresponding relationship information configured, and then output the main power supply or the backup power supply according to the judgment result.

The utility model is described in detail below in conjunction with accompanying drawing.

With reference to Fig. 1, this figure has shown the structural block diagram of a kind of dual power switcher of the utility model embodiment, comprises main power input port 11, backup power input port 12, has a control processor 13 of memory 134, execution device 14 , alarm processor 15 and display module 16, wherein: control processor 13 is connected with main power input port 11, backup power input port 12, execution device 14, alarm processor 15 and display module 16 respectively; The power input port 11 is connected to the standby power input port 12 .

The functions of each of the above parts are described in detail below:

The main power input port 11 is used to connect with a main power supply, and provide the main power supply to the control processor 13 and the execution device 14 respectively. The backup power input port 12 is used to connect with a backup power supply, and provide the backup power supply to the control processor 13 and the execution device 14 respectively.

The control processor 13 continuously detects the voltage of the main power input through the main power input port 11 and the voltage of the backup power input through the backup power input port 12, and according to the detected main power voltage and backup power voltage, and The corresponding relationship information among the main power supply voltage, backup power supply voltage and output power configured in the memory 134 judges the output power, and then controls the execution device 14 to output the output power according to the judgment result, the output power is the main power supply or the backup power supply.

The control processor 13 may further include a step-down rectifier circuit 131, a voltage sampling unit 132, and a judgment processing unit 133 connected in sequence, and the judgment processing unit 133 is also connected to the memory 134, wherein:

The step-down rectification circuit 131 performs step-down rectification on the main power input through the main power input port 11 and the backup power input through the backup power input port 12 respectively, and then sends them to the voltage sampling unit 132 . The step-down rectification circuit 131 is used to step-down and rectify the main power supply and the backup power supply to output a signal suitable for sampling by the voltage sampling unit 132. Specifically, two circuits as shown in FIG. 2 can be used to respectively control the main power supply and the backup power supply Step-down rectification processing is performed, and the step-down rectification circuit shown in FIG. 2 is composed of resistors, bridges and transformers. Of course, other circuit configurations capable of realizing step-down and rectification may also be used, and the present invention is not limited thereto.

The voltage sampling unit 132 has at least two analog/digital acquisition channels for AC sampling the voltages of the main power supply and backup power supply after step-down and rectification processing, and sends the voltage sampling values to the judgment processing unit 133 . In order to improve the switching speed, preferably, the voltage sampling unit 132 may adopt full AC sampling and perform multiple samplings, such as 16 times, within each half cycle.

The judgment processing unit 133 calculates the effective voltage values of the main power supply and the standby power supply in real time according to the received voltage sampling values, and then calculates the voltage effective values of the main power supply and the standby power supply according to the voltage effective values of the main power supply and the standby power supply, as well as the voltage of the main power supply and the standby power supply configured in the memory 134. The information on the correspondence between the voltage and the output power judges the output power, and controls the executing device 14 to output the main power or the standby power according to the judgment result. The judging processing unit 133 also judges whether to alarm according to the effective value of the voltage of the main power supply and the alarm threshold of the main power supply voltage configured in the memory 134, and sends an alarm control signal to the alarm processor 15 if it is judged that an alarm is required;

In order to effectively ensure the stability of the output voltage of the main power supply and prevent misoperation, preferably, the control processor 13 may further include a timer 135 . When the judging processing unit 133 controls the executive device 14 to output the backup power, if it judges that the output power is the main power and the timer 135 is not started according to the detected voltages of the main power and the backup power, then the timer 135 is started, And continue to judge the output power according to the detected voltages of the main power supply and the backup power supply within the timing time of the timer 135 . Within the timing time of this timer 135, if this judgment processing unit 133 judges that the output power is a backup power supply, then stop and reset this timer 135; within the timing time of this timer 135, if this judgment processing unit 133 judges If the output and output power sources are all main power sources, when the timing time of the timer 135 expires, the execution device 14 is controlled to output the main power source.

The memory 134 stores information about the corresponding relationship between the configured main power supply voltage, the backup power supply voltage and the output power supply, and is used for the judging processing unit 133 to judge switching. The corresponding relationship information configured in the memory 134 may be: when the output power is configured as the main power, the voltage range of the main power; and when the output power is configured as the backup power, the voltage range of the main power and the voltage range of the backup power. When the judging processing unit 113 performs switching judgment according to the corresponding relationship, it can not only switch when it is judged that the main power supply is powered off, but also switch when it is judged that the power supply of the main power supply is insufficient or too high, which improves the accuracy of switching , ensuring the stability of the power supply. Preferably, an alarm threshold of the main power supply voltage can also be configured in the memory 134 . Since the corresponding relationship information configured in the memory 134 is easy to modify, the dual power switcher of the present invention has good versatility.

The above-mentioned control processor 13 is a programmable single-chip microcomputer or an embedded chip.

The execution device 14 outputs main power or backup power under the control of the control processor 13 . The executive device 14 can be a relay, and the relay can be closed or opened according to the level of its coil voltage to output main power or backup power; the control processor 13 can control the coil voltage of the relay to control the The above relay outputs main power or backup power. The relay may include one or more power output ports for providing one or more identical output power sources.

In order to prevent the failure of the control processor 13 when the main power supply fails or the voltage is insufficient, it is impossible to control the relay to switch its output to a backup power supply. Preferably, when the relay is in the disconnected state, its The output is the backup power. That is, the control processor 13 controls the coil voltage of the relay to be a high voltage, the relay is closed, and the main power is output; the control processor 13 controls the coil voltage of the relay to be a low voltage, the relay is turned off, and the backup power is output. Therefore, even if the control processor 13 fails and the main power supply cannot supply power normally, it can ensure that the relay outputs a backup power supply in the disconnected state to ensure the power supply to the controlled equipment. Certainly, in another embodiment, the actuator 14 may also be other controllable switches, such as contactors, etc., and the present invention is not limited thereto.

The alarm processor 15 issues an alarm after receiving the alarm control signal.

The display module 16 may include two sets of digital tubes. When the control processor 13 detects the voltage of the main power supply and the voltage of the backup power supply, it can control the two groups of digital tubes to display the voltage of the main power supply and the voltage of the backup power supply detected by the control processor 13 respectively. The display module 16 may also include two LED indicator lights. When controlling the executive device 14 to output the main power supply, the control processor 13 controls the LED indicator light corresponding to the main power supply to light up, and controls the LED indicator lamp corresponding to the backup power supply to turn off; The LED indicator corresponding to the power supply is on; the LED indicator corresponding to the main power supply is off. Therefore, the use experience of the user can be greatly improved, so that the user can know the voltage values of the current main power supply and the backup power supply at a glance, and whether the current output power supply is the main power supply or the backup power supply. Of course, it can be displayed in various ways. For example, another two groups of nixie tubes can also be used to replace the above-mentioned two LED indicators to indicate whether the current output power is the main power supply or the backup power supply. The utility model is not limited thereto. In order to prevent the digital tube from being displayed normally due to interference in an extremely harsh environment, preferably, the display module 14 may further include a button or key for resetting the display module 14 .

In addition, the power switcher shown in Figure 1 can also include one or more control expansion ports (not shown in the figure), and a relay can be connected to the main power supply, backup power supply and control processor 13 respectively through the control expansion ports , so as to further increase the output power of the dual power switcher.

The following uses an application example to introduce a dual power switch of the present invention in detail:

In this application example, both the main power supply and the backup power supply provide AC AC220V voltage, and the dual power supply switcher is used to realize automatic switching between the main power supply and the backup power supply. Therefore, according to the supply voltages of the main power supply and the backup power supply, the corresponding relationship information between the main power supply voltage, the backup power supply voltage and the output power supply can be configured in the memory 134 first, as shown in the following table:

Main power supply voltage (V) Standby power supply voltage (V) output power <190V or >250V ＞200V backup power 210V~250V main power

That is, when the output power is configured as the main power supply, the voltage range of the main power supply is 210V to 250V; and when the output power supply is configured as the backup power supply, the voltage range of the main power supply is less than 190V or greater than 250V, and the voltage range of the backup power supply is greater than 200V.

The dual power switcher inputs the main power through the main power input port, and the backup power through the backup power input port, and then the control processor continuously detects and judges the voltage of the main power and the backup power, if it is judged that the voltage of the main power is less than 190V or greater than 250V, it is judged that the main power supply has been unable to provide the voltage for the normal operation of the controlled equipment. With the normal working voltage, control the actuator to output backup power to ensure the normal operation of the controlled equipment; when the actuator outputs backup power, if it is judged that the output voltage of the main power is greater than 210V and less than 250V, it is judged that the main power has recovered , can provide the controlled equipment with a voltage for normal operation. In order to ensure the stability of the main power supply and prevent misoperation, preferably, the control processor can start a timer and continue to judge The voltage of the main power supply. If it is judged that the voltage of the main power supply has been kept greater than 210V and less than 250V, it is considered that the main power supply can provide a stable voltage for the controlled equipment and ensure normal operation, and the control actuator outputs the main power supply.

Preferably, the alarm threshold of the main power supply voltage can also be configured in the memory, such as 250V. When the control processor determines that the voltage of the main power supply is greater than 250V, it can control the alarm processor to issue an alarm to prompt the user that the main power supply is abnormal.

Based on the use of the control processor in the utility model to obtain the configured main power supply voltage, backup power supply voltage and output power corresponding relationship information from the memory for switching judgment, the delay caused by the switching judgment circuit built by electronic components is reduced, and the switching speed is improved. accuracy. At the same time, because the corresponding relationship is easy to modify, the dual power switch has good versatility. For example, when both the main power supply and the backup power supply provide AC 110V voltage, if the dual power switch in the above application example needs to be used To perform automatic switching, it is only necessary to modify the corresponding relationship information among the main power supply voltage, backup power supply voltage and output power configured in the memory, which will not be repeated here.

The above descriptions are only preferred embodiments of the utility model, and are not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present utility model shall be included in the protection scope of the present utility model.

Claims (11)

1. A dual power switch, characterized in that it includes a main power input port, a backup power input port, an execution device and a control processor with a memory, and the control processor is connected to the main power input port and the backup power respectively. The input port is connected to the execution device, and the execution device is respectively connected to the input port of the main power supply and the input port of the standby power supply, wherein: The control processor continuously detects the voltage of the main power input through the main power input port and the voltage of the backup power input through the backup power input port, and according to the voltage detection result and the main power voltage and backup power voltage configured in the memory and the corresponding relationship information between the output power sources to judge the output power source, and then control the executive device to output the output power source according to the judgment result, the output power source being the main power source or the backup power source; The executing device outputs main power or backup power under the control of the control processing module. 2. The dual power switcher according to claim 1, characterized in that: The control processor includes a step-down rectifier circuit, a voltage sampling unit and a judgment processing unit connected in sequence, and the judgment processing unit is also connected with the memory. 3. The dual power switcher according to claim 2, characterized in that: The step-down rectification circuit respectively performs step-down and rectification processing on the main power input through the main power input port and the backup power input through the backup power input port, and then sends them to the voltage sampling unit; The voltage sampling unit has at least two analog/digital acquisition channels, which respectively perform AC voltage sampling on the main power supply and the backup power supply after step-down and rectification processing, and send the voltage sampling values to the judgment processing unit; The judgment processing unit calculates the effective value of the voltage of the main power supply and the backup power supply in real time according to the received voltage sampling value, and then according to the effective value of the voltage of the main power supply and the backup power supply, as well as the voltage of the main power supply and the backup power supply configured in the memory. The corresponding relationship information of the output power judges the output power, and controls the executing device to output the main power or the standby power according to the judgment result. 4. The dual power switcher as claimed in claim 3, wherein the control processor further comprises a timer, wherein: When the judging processing unit controls the executive device to output the standby power, if it judges that the output power is the main power and the timer is not started, then start the timer; If the judging processing unit judges that the output power is a standby power within the time limit of the timer, it stops and resets the timer; otherwise, when the timer expires, it controls the executive device to output the main power. 5. The dual power switcher according to claim 1, characterized in that: The corresponding relationship information configured in the memory includes: when the output power is configured as the main power, the voltage range of the main power; and when the output power is configured as the backup power, the voltage range of the main power and the voltage range of the backup power. 6. The dual power switcher according to claim 1, characterized in that: The execution device is a relay; the control processing module controls the relay to output main power or backup power by controlling the coil voltage of the relay. 7. The dual power switcher according to claim 6, characterized in that: When the control processor sets the coil voltage of the relay to high level, the relay is closed to output main power; when the control processor sets the coil voltage of the relay to low level, the relay is disconnected to output standby power. 8. The dual power switcher according to claim 1, further comprising an alarm processor connected to the control processor: Alarm thresholds for mains voltage are also configured in this memory; The control processor also judges whether to give an alarm according to the detected voltage of the main power supply and the alarm threshold configured in the memory, and sends an alarm control signal to the alarm processor if it is judged that an alarm is required; The alarm processor issues an alarm after receiving the alarm control signal. 9. The dual power switcher according to claim 1, further comprising a display module connected to the control processor, the display module comprising two sets of digital tubes and/or two LED indicators, wherein: When the control processor detects the voltage of the main power supply and the voltage of the backup power supply, it also controls two sets of digital tubes to respectively display the voltage of the main power supply and the voltage of the backup power supply detected by the control processor; and/or When the control processor controls the executive device to output the main power supply or the backup power supply, it also controls the LED indicator light corresponding to the main power supply or the backup power supply to light up. 10. The dual power switcher according to claim 9, characterized in that: It also includes a button or key for resetting the display module. 11. The dual power switcher according to any one of claims 1-10, characterized in that: The control processor is a single-chip microcomputer or an embedded chip.

Images