CN214205081U - Alternating current dual power supply switching device - Google Patents
Alternating current dual power supply switching device Download PDFInfo
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- CN214205081U CN214205081U CN202023194623.7U CN202023194623U CN214205081U CN 214205081 U CN214205081 U CN 214205081U CN 202023194623 U CN202023194623 U CN 202023194623U CN 214205081 U CN214205081 U CN 214205081U
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Abstract
The utility model discloses an alternating current dual power supply switching device, when it switches on in the control circuit, control the silicon controlled rectifier closure earlier, the silicon controlled rectifier has the characteristics of resistant heavy current impact, can improve the reliability of circuit, after the silicon controlled rectifier closure, control the relay switch closure again, thereby avoid the problem that power loss is big, the temperature rise is high because of the silicon controlled rectifier works for a long time often, after the relay switch closure, the electric current flows through the relay switch, the relay switch resistance value is few, the loss is few, the electric current does not flow through the silicon controlled rectifier, the heat dissipation volume of reducible device, the practicality is good; in addition, because two live wire input connecting ends and two ground wire input connecting ends are adopted, double-power input is facilitated, so that when one power supply is in power failure or abnormal, the other power supply can be controlled to be switched to supply power, and the practicability is good.
Description
Technical Field
The utility model relates to an exchange dual supply auto-change over device.
Background
At present, the on-off control of the existing double alternating current power supply mainly adopts a relay switch to control the on-off, and sparks are possibly generated on the switch during switching, so that potential safety hazards exist.
Therefore, how to overcome the above-mentioned drawbacks has become an important issue to be solved by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model overcomes above-mentioned technique is not enough, provides a two switching of power devices of interchange.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an alternating current dual power switching device comprises a control module 1, a first alternating current live wire input connecting end L1, a first alternating current zero line input connecting end N1, a second alternating current live wire input connecting end L2, a second alternating current zero line input connecting end N2, an alternating current live wire output connecting end L3 and an alternating current zero line output connecting end N3, wherein a first forward silicon controlled rectifier 1, a second reverse silicon controlled rectifier SCR2 and a controlled first relay switch module 21 which are controlled by the control module 1 are respectively connected in parallel between the first alternating current live wire input connecting end L1 and the alternating current live wire output connecting end L3, a third forward silicon controlled rectifier SCR3, a fourth reverse silicon controlled rectifier SCR4 and a controlled second relay switch module 22 which are controlled by the control module 1 are respectively connected in parallel between the first alternating current live wire input connecting end N1 and the alternating current zero line output connecting end N3, a fifth forward silicon controlled rectifier SCR5, a sixth reverse silicon controlled rectifier SCR6 and a controlled third relay switch module 23 controlled by the control module 1 are respectively connected in parallel between the second alternating current live wire input connecting end L2 and the alternating current live wire output connecting end L3, a seventh forward silicon controlled rectifier SCR7, an eighth reverse silicon controlled rectifier SCR8 and a controlled fourth relay switch module 24 controlled by the control module 1 are respectively connected in parallel between the second alternating current live wire input connecting end N2 and the alternating current live wire output connecting end N3, the control module 1 is further connected with a voltage detection module 3 for detecting the voltage between the first alternating current live wire input connecting end L1 and the first alternating current live wire input connecting end N1 and detecting the voltage between the first alternating current live wire input connecting end N1 and the second alternating current live wire input connecting end L2, and a current detection module 4 for detecting the line current size of the alternating current live wire output connecting end L3.
Preferably, a controlled resistor discharging module 25 controlled by the control module 1 is further connected between the ac live wire output connecting end L3 and the ac zero line output connecting end N3, the controlled resistor discharging module 25 includes a discharging resistor, a ninth forward silicon controlled rectifier SCR9 and a tenth reverse silicon controlled rectifier SCR10 controlled by the control module 1, the positive electrode of the ninth forward silicon controlled rectifier SCR9 is connected with the negative electrode of the tenth reverse silicon controlled rectifier SCR10 and the ac live wire output connecting end L3, the negative electrode of the ninth forward silicon controlled rectifier SCR9 is connected with the positive electrode of the tenth reverse silicon controlled rectifier SCR10 and one end of the discharging resistor, and the other end of the discharging resistor is connected with the ac zero line output connecting end N3.
Preferably, the control module 1 is a microprocessor, and is provided with a first switch control signal output terminal TR _ EN1, a second switch control signal output terminal TR _ EN2, a third switch control signal output terminal TR _ EN3 and a fourth switch control signal output terminal TR _ EN4, the first switch control signal output terminal TR _ EN1 is connected with a first driving module 11 for driving the first forward SCR1, the second reverse SCR2, the third forward SCR3 and the fourth reverse SCR4 to be turned on together, the second switch control signal output terminal TR _ EN2 is connected with a second driving module 12 for driving the fifth forward SCR5, the sixth reverse SCR6, the seventh forward SCR7 and the eighth reverse SCR8 to be turned on together, and the third switch control signal output terminal TR _ EN3 is connected with a second driving module 12 for driving the controlled first relay switch module 21, the controlled first relay switch module 21 and the controlled second relay module 21 to be turned on together, And the fourth switch control signal output end TR _ EN4 is connected with a fourth relay coil module 14 which is used for driving the controlled third relay switch module 23 and the controlled fourth relay switch module 24 to act together.
Preferably, the controlled first relay switch module 21, the controlled second relay switch module 22, the controlled third relay switch module 23 and the controlled fourth relay switch module 24 respectively adopt two single-pole double-throw relay switches, wherein a moving contact of the first relay switch is used as an input connecting end of the relay switch module, a normally open stationary contact is connected with a moving contact of the second relay switch, and a normally open stationary contact of the second relay switch is used as an output connecting end of the relay switch module; third relay coil module 13, fourth relay coil module 14 all adopt 4 relay coils respectively, 4 relay coils in the third relay coil module 13 are parallelly connected be used for corresponding the synchronous action of totally 4 relay switches on drive controlled first relay switch module 21, the controlled second relay switch module 22 between third switch control signal output TR _ EN3 and the ground, 4 relay coils in the fourth relay coil module 14 are parallelly connected be used for corresponding the synchronous action of totally 4 relay switches on drive controlled third relay switch module 23, the controlled fourth relay switch module 24 between third switch control signal output TR _ EN3 and the ground.
Preferably, the control module 1 is further connected with a first switch state detection module 5 for detecting a switch state in the controlled first relay switch module 21, a third switch state detection module 6 for detecting a switch state in the controlled third relay switch module 23, one voltage detection input end of the first switch state detection module 5 is connected with a movable contact of a second relay switch in the controlled first relay switch module 21, and the other voltage detection input end is connected with a normally closed static contact of the second relay switch in the controlled first relay switch module 21, one voltage detection input end of the third switch state detection module 6 is connected with the movable contact of the second relay switch in the controlled third relay switch module 23, and the other voltage detection input end is connected with the normally closed stationary contact of the second relay switch in the controlled first relay switch module 21.
Preferably, first drive module 11, second drive module 12 have all adopted 4 bidirectional thyristor opto-couplers respectively to carry out isolation control, 4 bidirectional thyristor opto-couplers in the first drive module 11 are series connection in proper order and voltage 12V, negative pole link pass through resistance connection are connected to the positive terminal after establishing ties first on-off control signal output TR _ EN1, 4 bidirectional thyristor opto-couplers in the second drive module 12 are series connection in proper order and voltage 12V, negative pole end pass through resistance connection are connected to its positive terminal voltage 12V, the isolation output of bidirectional thyristor opto-couplers is used for leading to the switching-on of voltage conversion circuit drive corresponding silicon controlled rectifier to second on-off control signal output TR _ EN 2.
Compared with the prior art, the beneficial effects of the utility model are that:
1. when a control loop is conducted, the thyristor is controlled to be closed firstly, the thyristor has the characteristic of high current impact resistance, the reliability of a circuit can be improved, and after the thyristor is closed, the relay switch is controlled to be closed, so that the problems of large power loss and high temperature rise caused by long-time operation of the thyristor are solved; in addition, because two live wire input connecting ends and two ground wire input connecting ends are adopted, double-power input is facilitated, so that when one power supply is in power failure or abnormal, the other power supply can be controlled to be switched to supply power, and the practicability is good; in addition, the voltage detection module is arranged to facilitate whether the corresponding power supply input has voltage and whether the voltage is abnormal, so as to switch to the other power supply input when one power supply voltage is abnormal, and the current detection module is arranged to facilitate the detection of whether the output end has current and the magnitude of the current.
2. In the scheme, a first switch control signal output end TR _ EN1, a second switch control signal output end TR _ EN2, a third switch control signal output end TR _ EN3 and a fourth switch control signal output end TR _ EN4 of the control module are convenient for correspondingly controlling whether a first driving module, a second driving module, a third relay coil module and a fourth relay coil module work or not, so that a first forward silicon controlled rectifier SCR1, a second reverse silicon controlled rectifier SCR2, a third forward silicon controlled rectifier SCR3 and a fourth reverse silicon controlled rectifier SCR4 are switched on or off together, a fifth forward silicon controlled rectifier SCR5, a sixth reverse silicon controlled rectifier SCR6, a seventh forward silicon controlled rectifier SCR7 and an eighth reverse silicon controlled rectifier SCR8 are switched on or off together, the controlled first relay switch module and the controlled second relay switch module act together, the controlled third relay switch module and the controlled fourth relay switch module act together, it is convenient to control.
3. This case relay coil in the third relay coil module is parallel connection respectively, is convenient for control it and gets electric or loses the electricity simultaneously, is convenient for correspond 4 relay switch's synchronous motion, relay coil in the fourth relay coil module is parallel connection respectively, is convenient for control it and gets electric or loses the electricity simultaneously, is convenient for correspond 4 relay switch's synchronous motion, and the practicality is good, in addition, owing to what adopt all is single-pole switch, required drive power is less.
Drawings
Fig. 1 is an overall structural diagram of the present invention.
Fig. 2 is one of partial circuit diagrams of the present disclosure.
Fig. 3 is a second partial circuit diagram of the present invention.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of examples to facilitate understanding by those skilled in the art:
as shown in fig. 1 to 3, an ac dual power switching device includes a control module 1, a first ac live wire input connection end L1, a first ac live wire input connection end N1, a second ac live wire input connection end L2, a second ac live wire input connection end N2, an ac live wire output connection end L3, and an ac live wire output connection end N3, wherein a first forward SCR1, a second reverse SCR2, and a controlled first relay switch module 21 controlled by the control module 1 are respectively connected in parallel between the first ac live wire input connection end L1 and the ac live wire output connection end L3, and a third forward SCR3, a fourth reverse SCR4, and a fourth reverse SCR4 controlled by the control module 1 are respectively connected in parallel between the first ac live wire input connection end N1 and the ac live wire output connection end N3, And a controlled second relay switch module 22, a fifth forward silicon controlled rectifier SCR5, a sixth reverse silicon controlled rectifier SCR6 and a controlled third relay switch module 23 controlled by the control module 1 are respectively connected in parallel between the second ac live wire input connection end L2 and the ac live wire output connection end L3, a seventh forward silicon controlled rectifier SCR7, an eighth reverse silicon controlled rectifier SCR8 and a controlled fourth relay switch module 24 controlled by the control module 1 are respectively connected in parallel between the second ac null wire input connection end N2 and the ac null wire output connection end N3, and the control module 1 is further connected with a voltage detection module 3, a voltage detection module 3, a voltage detection module, And the current detection module 4 is used for detecting the current of the line where the output connecting end L3 of the alternating current live wire is located.
As described above, when the control loop is switched on, the device firstly controls the thyristor to be closed, the thyristor has the characteristic of high current impact resistance, the reliability of the circuit can be improved, and after the thyristor is closed, the relay switch is controlled to be closed, so that the problems of large power loss and high temperature rise caused by long-time operation of the thyristor are solved; in addition, because two live wire input connecting ends and two ground wire input connecting ends are adopted, double-power input is facilitated, so that when one power supply is in power failure or abnormal, the other power supply can be controlled to be switched to supply power, and the practicability is good; in addition, the voltage detection module 3 is arranged to facilitate whether the corresponding power supply input has voltage and whether the voltage is abnormal, so as to switch to another power supply input when one of the power supply voltages is abnormal, and the current detection module 4 is arranged to facilitate detecting whether the output end has current and current magnitude.
As described above, in specific implementation, a controlled resistor discharging module 25 controlled by the control module 1 is further connected between the ac live wire output connection end L3 and the ac zero line output connection end N3, the controlled resistor discharging module 25 includes a discharging resistor, a ninth forward SCR9 and a tenth reverse SCR10 controlled by the control module 1, the positive electrode of the ninth forward SCR9 is connected to the negative electrode of the tenth reverse SCR10 and the ac live wire output connection end L3, the negative electrode of the ninth forward SCR9 is connected to the positive electrode of the tenth reverse SCR10 and one end of the discharging resistor, and the other end of the discharging resistor is connected to the ac zero line output connection end N3, so as to discharge to a load end when starting, thereby preventing a large current impact when starting.
As shown in fig. 1 and fig. 2, in a specific implementation, the control module 1 is a microprocessor, and is provided with a first switch control signal output terminal TR _ EN1, a second switch control signal output terminal TR _ EN2, a third switch control signal output terminal TR _ EN3, and a fourth switch control signal output terminal TR _ EN4, the first switch control signal output terminal TR _ EN1 is connected with a first driving module 11 for driving the first forward SCR1, the second reverse SCR2, the third forward SCR3, and the fourth reverse SCR4 to be turned on together, the second switch control signal output terminal TR _ EN2 is connected with a second driving module 12 for driving the fifth forward SCR5, the sixth reverse SCR6, the seventh forward SCR7, and the eighth reverse SCR8 to be turned on together, and the third switch control signal output terminal TR _ EN3 is connected with a first controlled switch relay module 21, a second controlled switch relay module 21, and a controlled by controlling the first controlled switch relay module 21 to be turned on, And the fourth switch control signal output end TR _ EN4 is connected with a fourth relay coil module 14 which is used for driving the controlled third relay switch module 23 and the controlled fourth relay switch module 24 to act together.
As described above, the first switch control signal output terminal TR _ EN1, the second switch control signal output terminal TR _ EN2, the third switch control signal output terminal TR _ EN3, and the fourth switch control signal output terminal TR _ EN4 of the control module 1 according to the present disclosure are convenient for correspondingly controlling whether the first driving module 11, the second driving module 12, the third relay coil module 13, and the fourth relay coil module 14 are operated, so that the first forward SCR1, the second reverse SCR2, the third forward SCR3, and the fourth reverse SCR4 are turned on or off together, the fifth forward SCR5, the sixth reverse SCR6, the seventh forward SCR7, and the eighth reverse SCR8 are turned on or off together, the controlled first relay switch module 21 and the controlled second relay switch module 22 are operated together, and the controlled third relay switch module 23, and the controlled second relay switch module 23 are operated together, The controlled fourth relay switch module 24 acts together, which is convenient to control.
As shown in fig. 2, in a specific implementation, the controlled first relay switch module 21, the controlled second relay switch module 22, the controlled third relay switch module 23, and the controlled fourth relay switch module 24 all use two single-pole double-throw relay switches, respectively, where a moving contact of a first relay switch is used as an input connection end of the relay switch module, a normally open stationary contact is connected with a moving contact of a second relay switch, and a normally open stationary contact of the second relay switch is used as an output connection end of the relay switch module; third relay coil module 13, fourth relay coil module 14 all adopt 4 relay coils respectively, 4 relay coils in the third relay coil module 13 are parallelly connected be used for corresponding the synchronous action of totally 4 relay switches on drive controlled first relay switch module 21, the controlled second relay switch module 22 between third switch control signal output TR _ EN3 and the ground, 4 relay coils in the fourth relay coil module 14 are parallelly connected be used for corresponding the synchronous action of totally 4 relay switches on drive controlled third relay switch module 23, the controlled fourth relay switch module 24 between third switch control signal output TR _ EN3 and the ground.
As described above, in the present embodiment, the relay coils in the third relay coil module 13 are respectively connected in parallel, so as to facilitate control of simultaneous power on or power off of the relay coils, and facilitate synchronous operation of 4 relay switches, and the relay coils in the fourth relay coil module 14 are respectively connected in parallel, so as to facilitate control of simultaneous power on or power off of the relay coils, and facilitate synchronous operation of 4 relay switches, so that the utility is good; in addition, because the single-pole switch is adopted, the required driving force is small.
As shown in fig. 3, in a specific implementation, the control module 1 is further connected with a first switch state detection module 5 for detecting a switch state of the controlled first relay switch module 21, a third switch state detection module 6 for detecting a switch state of the controlled third relay switch module 23, one voltage detection input end of the first switch state detection module 5 is connected with a movable contact of a second relay switch in the controlled first relay switch module 21, and the other voltage detection input end is connected with a normally closed static contact of the second relay switch in the controlled first relay switch module 21, one voltage detection input end of the third switch state detection module 6 is connected with the movable contact of the second relay switch in the controlled third relay switch module 23, and the other voltage detection input end is connected with the normally closed stationary contact of the second relay switch in the controlled first relay switch module 21.
As described above, in the present invention, when the third relay coil module 13 is not powered, the moving contact and the normally closed stationary contact of the second relay switch in the controlled first relay switch module 21 are in the on state, and otherwise, the moving contact and the normally closed stationary contact are in the off state, and the first switch state detection module 5 performs identification; when the fourth relay coil module 14 is not powered on, the moving contact and the normally closed stationary contact of the second relay switch in the controlled third relay switch module 23 are in a connected state, otherwise, the moving contact and the normally closed stationary contact are in a disconnected state, and the first switch state detection module 5 is used for identifying, so that the detection is convenient.
As shown in fig. 2, in specific implementation, the first driving module 11 and the second driving module 12 respectively adopt 4 triac optocouplers for isolation control, the 4 triac optocouplers in the first driving module 11 are sequentially connected in series and the positive terminal thereof is connected with voltage 12V, and the negative terminal thereof is connected with the first switch control signal output terminal TR _ EN1 through resistance, the 4 triac optocouplers in the second driving module 12 are sequentially connected in series and the positive terminal thereof is connected with voltage 12V and the negative terminal thereof is connected with the second switch control signal output terminal TR _ EN2 through resistance, and the isolation output terminal of the triac optocoupler is used for driving conduction of a corresponding thyristor through a voltage conversion circuit.
As described above, the present disclosure is directed to an ac dual power switching device, and all technical solutions that are the same as or similar to the present disclosure should be considered as falling within the scope of the present disclosure.
Claims (6)
1. The utility model provides an exchange dual supply auto-change over device, its characterized in that is including control module (1), first alternating current live wire input link L1, first alternating current zero line input link N1, second alternating current live wire input link L2, second alternating current zero line input link N2, alternating current live wire output link L3 and alternating current zero line output link N3, first alternating current live wire input link L1 with between the alternating current live wire output link L3 respectively the parallelly connected first forward silicon controlled rectifier SCR1, second reverse silicon controlled rectifier SCR2 and the controlled first relay switch module (21) that receive control module (1) control, respectively the parallelly connected third forward silicon controlled rectifier 3, fourth reverse silicon controlled rectifier SCR4, the parallelly connected controlled third forward silicon controlled rectifier 3 of control module (1) between first alternating current live wire input link N1 and the alternating current zero line output link N3, fourth reverse silicon controlled rectifier SCR4, And a controlled second relay switch module (22), a fifth forward silicon controlled rectifier (SCR 5), a sixth reverse silicon controlled rectifier (SCR 6) and a controlled third relay switch module (23) controlled by the control module (1) are respectively connected in parallel between a second alternating current live wire input connecting end L2 and an alternating current live wire output connecting end L3, a seventh forward silicon controlled rectifier (SCR 7), an eighth reverse silicon controlled rectifier (SCR 8) and a controlled fourth relay switch module (24) controlled by the control module (1) are respectively connected in parallel between a second alternating current live wire input connecting end N2 and an alternating current live wire output connecting end N3, and the control module (1) is further connected with a voltage detection module (3) for detecting the voltage between the first alternating current live wire input connecting end L1 and a first alternating current live wire input connecting end N1 and detecting the voltage between the first alternating current live wire input connecting end N1 and a second alternating current live wire input connecting end L2, And the current detection module (4) is used for detecting the current of the line where the output connecting end L3 of the alternating current live wire is located.
2. The alternating-current dual-power switching device according to claim 1, wherein a controlled resistor discharging module (25) controlled by the control module (1) is further connected between the alternating-current live wire output connection end L3 and the alternating-current neutral wire output connection end N3, the controlled resistor discharging module (25) includes a discharging resistor, a ninth forward silicon controlled rectifier SCR9 and a tenth reverse silicon controlled rectifier 10 controlled by the control module (1), an anode of the ninth forward silicon controlled rectifier SCR9 is connected with a cathode of the tenth reverse silicon controlled rectifier SCR10 and the alternating-current live wire output connection end L3, a cathode of the ninth forward silicon controlled rectifier 9 is connected with an anode of the tenth reverse silicon controlled rectifier SCR10 and one end of the discharging resistor, and the other end of the discharging resistor is connected with the alternating-current neutral wire output connection end N3.
3. An AC dual power switching device as claimed in claim 1 or 2, wherein the control module (1) is a microprocessor having a first switch control signal output terminal TR _ EN1, a second switch control signal output terminal TR _ EN2, a third switch control signal output terminal TR _ EN3 and a fourth switch control signal output terminal TR _ EN4, the first switch control signal output terminal TR _ EN1 is connected with a first driving module (11) for driving the first forward SCR1, the second reverse SCR2, the third forward SCR3 and the fourth reverse SCR4 to be conducted together, the second switch control signal output terminal TR _ EN2 is connected with a second driving module (12) for driving the fifth forward SCR5, the sixth reverse SCR6, the seventh forward SCR7 and the eighth reverse SCR8 to be conducted together, the third switch control signal output end TR _ EN3 is connected with a third relay coil module (13) for driving the controlled first relay switch module (21) and the controlled second relay switch module (22) to act together, and the fourth switch control signal output end TR _ EN4 is connected with a fourth relay coil module (14) for driving the controlled third relay switch module (23) and the controlled fourth relay switch module (24) to act together.
4. An alternating current dual power supply switching device according to claim 3, wherein the controlled first relay switch module (21), the controlled second relay switch module (22), the controlled third relay switch module (23) and the controlled fourth relay switch module (24) respectively adopt two single-pole double-throw relay switches, wherein a movable contact of the first relay switch is used as an input connection end of the relay switch module, a normally open stationary contact is connected with a movable contact of the second relay switch, and a normally open stationary contact of the second relay switch is used as an output connection end of the relay switch module; third relay coil module (13), fourth relay coil module (14) all adopt 4 relay coils respectively, 4 relay coils in third relay coil module (13) are parallelly connected be used for corresponding the synchronous action of totally 4 relay switches on the first relay switch module (21), the controlled second relay switch module of drive on the third switch control signal output TR _ EN3 and the ground, 4 relay coils in fourth relay coil module (14) are parallelly connected be used for corresponding the synchronous action of totally 4 relay switches on the controlled third relay switch module (23), the controlled fourth relay switch module (24) of drive between third switch control signal output TR _ EN3 and the ground.
5. An alternating current dual power switching device according to claim 4, wherein the control module (1) is further connected with a first switch state detection module (5) for detecting the state of the controlled first relay switch module (21), a third switch state detection module (6) for detecting the state of the controlled third relay switch module (23), one voltage detection input end of the first switch state detection module (5) is connected with the movable contact of the second relay switch in the controlled first relay switch module (21), the other voltage detection input end is connected with the normally closed stationary contact of the second relay switch in the controlled first relay switch module (21), one voltage detection input end of the third switch state detection module (6) is connected with the movable contact of the second relay switch in the controlled third relay switch module (23), The other voltage detection input end is connected with a normally closed static contact of a second relay switch in the controlled first relay switch module (21).
6. An alternating current dual power switching device according to claim 3, wherein the first driving module (11) and the second driving module (12) respectively adopt 4 triac opto-couplers for isolation control, the 4 triac opto-couplers in the first driving module (11) are sequentially connected in series, and the positive connection end and the negative connection end after being connected in series are connected with the voltage 12V through resistors, the first switch control signal output end TR _ EN1 is connected with the negative connection end, the 4 triac opto-couplers in the second driving module (12) are sequentially connected in series, and the positive connection end and the negative connection end are connected with the voltage 12V and the second switch control signal output end TR _ EN2 through resistors, and the isolation output end of the triac opto-couplers is used for driving the conduction of corresponding thyristors through a voltage conversion circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023194623.7U CN214205081U (en) | 2020-12-23 | 2020-12-23 | Alternating current dual power supply switching device |
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| CN202023194623.7U CN214205081U (en) | 2020-12-23 | 2020-12-23 | Alternating current dual power supply switching device |
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