CN210839058U - Double-power switching device - Google Patents
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- CN210839058U CN210839058U CN201921857123.1U CN201921857123U CN210839058U CN 210839058 U CN210839058 U CN 210839058U CN 201921857123 U CN201921857123 U CN 201921857123U CN 210839058 U CN210839058 U CN 210839058U
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Abstract
The utility model relates to an electric power system power supply technical field discloses a dual supply auto-change over device. The main power module is respectively connected with the main power supply, the auxiliary power supply and the load and is used for switching on or switching off a first power supply path between the main power supply and the load or switching on or switching off a second power supply path between the auxiliary power supply and the load; the auxiliary switching module is connected with the main power module and used for receiving and outputting an electric signal for controlling the on-off of the main power module according to a control instruction so as to select to switch the main power supply or the auxiliary power supply to supply power to the load; and the control module is respectively connected with the main power supply, the auxiliary power supply, the load and the auxiliary switching module, and is used for acquiring power supply parameters of the main power supply and the auxiliary power supply and outputting the control instruction according to the power supply parameters. The utility model provides a switching time of dual power supply switching device power is short, high to load adaptability.
Description
Technical Field
The utility model relates to an electric power system power supply technical field especially relates to a dual supply auto-change over device.
Background
Statistics show that more than 90% of power quality problems are caused by voltage sags or power supply interruptions, and voltage sags or power supply interruptions occur more frequently than other power quality problems. The voltage will be temporarily or the power supply is interrupted, which may cause the problems of product rejection, equipment damage, personal safety threat and the like. The double-circuit power supply is adopted for independent power supply, and the quick switching between the two independent power supplies can be realized by utilizing the double-circuit power supply quick switching switch, so that the power utilization terminal is not influenced by voltage sag or power supply interruption. However, the conventional hybrid solid-state transfer switch cannot be used in a situation with a high requirement on the switching speed due to the mechanical switch, while the conventional electronic solid-state transfer switch can realize a high switching speed, but has strict requirements on the phase difference and the load power factor of the main power supply and the standby power supply.
SUMMERY OF THE UTILITY MODEL
Therefore, it is necessary to provide a dual power source switching device to solve the problems of the conventional hybrid solid-state switch that the switching speed is not high enough and the applicability of the electronic solid-state switch is low.
A dual power supply switching device is used for realizing the switching between a main power supply and an auxiliary power supply, wherein the main power supply and the auxiliary power supply are used for supplying power to a load, and the device comprises a main power module which is respectively connected with the main power supply, the auxiliary power supply and the load and is used for switching on or off a first power supply path between the main power supply and the load or switching on or off a second power supply path between the auxiliary power supply and the load; the auxiliary switching module is connected with the main power module and used for receiving a control instruction and outputting an electric signal for controlling the on-off of the main power module to the main power module according to the control instruction so as to selectively switch the main power supply or the auxiliary power supply to supply power to the load; and the control module is respectively connected with the main power supply, the auxiliary power supply, the load and the auxiliary switching module, and is used for acquiring power supply parameters of the main power supply and the auxiliary power supply and outputting the control instruction according to the power supply parameters.
In one embodiment, the main power module comprises: the power circuit comprises an electronic switch group which is used for switching on or off the first power supply path or the second power supply path according to the electric signal output by the auxiliary switching module; the mechanical switch group is connected with the electronic switch group in series and is used for assisting in turning on or turning off a power supply path where the power circuit is located; and the voltage protector is connected with the mechanical switch group in series and is used for adjusting the voltage of the power circuit and adjusting the voltage to a preset voltage range.
In one embodiment, the electronic switch group comprises at least one pair of a first electronic switch tube and a second electronic switch which are connected in parallel in an opposite direction.
In one embodiment, the auxiliary switching module comprises two auxiliary switch circuits, and one auxiliary switch circuit is correspondingly connected with one electronic switch group in parallel; the auxiliary switch circuit is used for providing on-off reverse voltage for the electronic switch group.
In one embodiment, the auxiliary switching circuit includes an auxiliary capacitor, an auxiliary reactance, and an auxiliary electronic switching tube connected in series in this order, where one end of the auxiliary capacitor is connected to the input end of the electronic switching group, and the cathode of the auxiliary electronic switching tube is connected to the output end of the electronic switching group.
In one embodiment, the auxiliary switching module further includes a pre-charging circuit connected to the auxiliary switching circuit, an input terminal of the pre-charging circuit is connected to the main power supply or the auxiliary power supply, and an output terminal of the pre-charging circuit is connected to the auxiliary capacitor for charging the auxiliary capacitor in the auxiliary switching circuit.
In one embodiment, the pre-charging circuit comprises an overvoltage limiter, a resistor and a diode which are sequentially connected in series, wherein one end of the overvoltage limiter is used as an input end of the pre-charging circuit and is connected with the main power supply or the auxiliary power supply, and a cathode of the diode is used as an output end of the pre-charging circuit and is connected with the auxiliary capacitor.
In one embodiment, the dual power switching device further comprises a bypass switch circuit connected with the main power module and used for bypassing the main power module when the main power module fails or is overhauled.
In one embodiment, the dual power switching device further includes a plurality of voltage equalizing circuits, which are respectively connected to the first electronic switch tube, the second electronic switch tube, and the auxiliary electronic switch tube in a one-to-one correspondence manner, and are configured to perform voltage equalizing processing on the first electronic switch tube, the second electronic switch tube, and the auxiliary electronic switch tube.
The utility model provides a dual power supply switching device, including the main power module, respectively with main power supply, auxiliary power supply, load connection, be used for switching on or break off the main power supply with the first power supply route between the load, or be used for switching on or break off the auxiliary power supply with the second power supply route between the load; the auxiliary switching module is connected with the main power module and used for receiving a control instruction and outputting an electric signal for controlling the on-off of the main power module to the main power module according to the control instruction so as to selectively switch the main power supply or the auxiliary power supply to supply power to the load; and the control module is respectively connected with the main power supply, the auxiliary power supply, the load and the auxiliary switching module, and is used for acquiring power supply parameters of the main power supply and the auxiliary power supply and outputting the control instruction according to the power supply parameters. The utility model provides a dual power supply switching device passes through supplementary switching module to the main power module provides and closes required reverse voltage, realizes the quick turn-off of route between main power source and load to realize switching on fast of route between auxiliary power source and load, thereby realize by main power source to auxiliary power source's fast switch-over. Meanwhile, as the current in a steady state is not all born by the electronic switching tube, the phase difference and the load power factor of the main power supply and the standby power supply are not strictly required, and the adaptability is high.
Drawings
Fig. 1 is a block diagram of a dual power switching device according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating a connection of a main power module assembly including a pair of electronic switching tubes connected in parallel in reverse direction when the dual power switching device according to one embodiment of the present invention is applied to a single-phase circuit;
fig. 3 is a schematic diagram illustrating a connection of an auxiliary switching module assembly including a plurality of pairs of electronic switching tubes connected in parallel in reverse direction when the dual power switching device according to one embodiment of the present invention is applied to a single-phase circuit;
fig. 4 is a schematic diagram illustrating a connection of an auxiliary switching module assembly of a dual power switching device applied to a single-phase circuit according to an embodiment of the present invention;
fig. 5 is a schematic diagram illustrating a connection of a pre-charge circuit component of a dual power switching device applied to a single-phase circuit according to an embodiment of the present invention;
fig. 6 is a schematic diagram illustrating a connection between a bypass switch circuit and a voltage-sharing circuit component of a single-phase circuit of a dual power switching device according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a circuit connection of the dual power switching device according to one embodiment of the present invention applied to a three-phase circuit.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. As used herein, the terms "vertical," "horizontal," "left," "right," "upper," "lower," "front," "rear," "circumferential," and the like are based on the orientation or positional relationship shown in the drawings and are intended to facilitate the description of the invention and to simplify the description, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The problem of power quality caused by voltage sag or power supply interruption can be quickly switched by adopting a double-path independent power supply, so that the reliability of power supply of equipment is ensured. The core component for completing the quick switching is a double-circuit power supply quick switching switch. The double-circuit power supply quick change-over switch can realize quick change-over between two independent power supplies so as to ensure that the power utilization terminal is not influenced by voltage drop or power supply interruption. The solid-state switch adopts power electronic devices as an actuating mechanism for switching, and has very obvious advantages in switching speed compared with a mechanical type switch. The utility model belongs to solid-state dual power transfer switch, its main part comprises power electronics, cooperates appropriate control strategy, can realize that the switching time is short, advantages such as load strong adaptability.
Fig. 1 is a block diagram of a dual power switching device according to an embodiment of the present invention, which includes a main power module 100, an auxiliary switching module 200, and a control module 300. The main power module 100 is connected to the main power source, the auxiliary power source, and the load, and is configured to turn on or off a first power supply path between the main power source and the load, or turn on or off a second power supply path between the auxiliary power source and the load. And the auxiliary switching module 200 is connected with the main power module and used for receiving a control instruction and outputting an electric signal for controlling the on-off of the main power module to the main power module according to the control instruction so as to selectively switch the main power supply or the auxiliary power supply to supply power to the load. And the control module 300 is respectively connected with the main power supply, the auxiliary power supply, the load and the auxiliary switching module, and is used for acquiring power supply parameters of the main power supply and the auxiliary power supply and outputting the control instruction according to the power supply parameters.
Fig. 2 is a schematic diagram of a connection of a main power module assembly including a pair of electronic switching tubes connected in reverse parallel in a single-phase circuit, where the dual power switching device according to one embodiment of the present invention is applied. In one embodiment, the main power module includes two power circuits 110 and 120, the power circuit 110 is connected to the main power source and the load, respectively, and the power circuit 120 is connected to the auxiliary power source and the load, respectively. The power circuit 110 includes an electronic switch set 111 and a mechanical switch set 112.
In one embodiment, the electronic switch group 111 is configured to turn on or off the first power supply path or the second power supply path according to the electrical signal output by the auxiliary switching module 200.
The power circuit 110 is specifically described by taking a power circuit connecting the main power supply and the load as an example. The electronic switch group 111 includes a pair of first electronic switch tubes TP connected in inverse parallel1And a second electronic switching tube TP2The first electronic switch tube TP1And the second electronic switch tube TP2The connection point is used as the input end of the electronic switch group, and the first electronic switch tube TP1And the second electronic switch tube TP2Is connected as an output of the electronic switch bank.
Fig. 3 is a schematic diagram of the connection of the auxiliary switching module assembly of the dual power switching device according to one embodiment of the present invention, which is applied to a single-phase circuit and includes a plurality of pairs of electronic switching tubes connected in parallel. In one embodiment, the electronic switch set 111 includes a plurality of pairs of first electronic switch tubes TP connected in anti-parallel1And a second electronic switching tube TP2The first electronic switch tube TP1And the second electronic switch tube TP2The first electronic switching tube TP1And the second electronic switch tube TP2A plurality of pairs of first electronic switching tubes TP connected in inverse parallel1And a second electronic switching tube TP2Are connected in series with each other. A first pair of the first electronic switching tubes TP1And the second electronic switching tube TP2The connection point of the cathodes of (a) is used as the input end of the electronic switch group 111, and the last pair of the 2N-1 electronic switch tubes TP2N-1 anode and said 2N electronic switching tube TP2NThe connection point of the cathode is used asAnd the output end of the electronic switch group.
In one embodiment, the mechanical switch group is used for assisting to switch on or off the power supply path of the power circuit, and the mechanical switch group comprises a first mechanical switch Kp1And a second mechanical switch Kp2. When the dual-power switching device needs to be overhauled and maintained, the first mechanical switch Kp is disconnected1And a second mechanical switch Kp2Thereby carrying out safe overhaul and maintenance.
In one embodiment, the output terminal of the main power supply is connected to the first mechanical switch Kp1After being connected in series, the output end of the electronic switch group is connected with the input end of the electronic switch group, and the output end of the electronic switch group is connected with the second mechanical switch Kp2And is connected with the load after being connected in series.
In one embodiment, the power circuit further comprises a voltage protector MOVp1Said voltage protector MOVp1And the electronic switch group is connected in parallel and used for adjusting the voltage of the power circuit and adjusting the voltage to a preset voltage range. The device protection circuit prevents the circuit from being damaged by overvoltage or undervoltage, thereby playing a role in protecting the circuit.
Similarly, the part of the power circuit 110 connected to the main power supply is replaced with a part connected to the auxiliary power supply, that is, a circuit of the power circuit 120 connecting the auxiliary power supply and the load.
Fig. 4 is a schematic diagram illustrating the connection of the auxiliary switching module assembly of the dual power switching device according to one embodiment of the present invention, which is applied to a single-phase circuit. In one embodiment, the auxiliary switching module comprises two auxiliary switch circuits 210 and 220, one of the auxiliary switch circuit sections is connected in parallel with one of the electronic switch sets, and the auxiliary switch circuits are used for providing on-off reverse voltage for the electronic switch sets.
The auxiliary switch circuit 210 connected in parallel to the power circuit connecting the main power supply and the load is taken as an example, and the specific connection of the auxiliary switch circuit will be described. In one embodiment, the auxiliary switching circuit 210 includes an auxiliary switchAuxiliary capacitor Cp1Auxiliary reactance Lp1And an auxiliary electronic switching tube STp1. The auxiliary capacitor Cp1Is used as the input terminal of the auxiliary switch circuit, is connected with the input terminal of the electronic switch group 111, and the auxiliary capacitor Cp1And the auxiliary reactance Lp1Is connected to the input terminal of the controller. The auxiliary reactance Lp1And the auxiliary electronic switch tube STp1Is connected with the anode of (2). The auxiliary electronic switch tube STp1Is used as the output terminal of the auxiliary switch circuit and is connected with the output terminal of the electronic switch group 111.
Similarly, the auxiliary switch circuit connected in parallel with the power circuit connecting the main power supply and the load is connected in the same manner as the auxiliary switch circuit described above.
When the main power supply is abnormal and the auxiliary power supply is normal, the power supply from the main power supply to the load needs to be switched to the power supply from the auxiliary power supply to the load. When the load current iL>0, triggering the auxiliary electronic switch tube ST connected with the main power supplyp1Is conducted to provide the first electronic switch tube TP1Turning off the required reverse voltage to make the first electronic switch tube TP1The reverse voltage is borne to cut off and disconnect; when the load current iL<0, triggering the auxiliary electronic switch tube ST connected with the main power supplyp2Is conducted to provide the second electronic switch tube TP1Turning off the required reverse voltage to make the second electronic switch tube TP2The back pressure is borne to cut off the disconnection.
Fig. 5 is a schematic diagram illustrating a connection of a pre-charge circuit component of a single-phase circuit to which a dual power switching device according to an embodiment of the present invention is applied. In one embodiment, the auxiliary switching module further comprises a pre-charging circuit 230 connected to the auxiliary switch circuit, wherein the pre-charging circuit 230 is configured to charge an auxiliary capacitor in the auxiliary switch circuit.
The precharge circuit 230 of the auxiliary switch circuit is exemplified and the connection thereof will be specifically described. The pre-chargingThe electrical circuit 230 comprises an over-voltage limiter MOVp2A resistor Rp and a diode Dp 1. The overvoltage limiter MOVp2As the input terminal of the pre-charging circuit, is connected to the input terminal of the electronic switch group. The overvoltage limiter MOVp2Is connected to the input of the resistor Rp, the output of the resistor Rp is connected to the anode of the diode Dp 1. The cathode of the diode Dp1 is used as the output terminal of the pre-charge circuit, and the auxiliary capacitor C in the auxiliary switch circuitp1And the auxiliary reactance Lp1Is connected at the connection point of (a).
Fig. 6 is a schematic diagram illustrating the connection between the bypass switch circuit and the voltage-sharing circuit component of the dual power switching device according to one embodiment of the present invention. In one embodiment, the dual power switching device further comprises a bypass switch circuit 240. The bypass switch circuit includes a third mechanical switch Kp3 in parallel with the main power module for bypassing the main power module when the main power module fails or is serviced.
In one embodiment, the dual power switching device further includes a plurality of voltage equalizing circuits respectively connected to the first electronic switch tube TP1A second electronic switch tube TP2Auxiliary electronic switch tube STp1One-to-one connection for the first electronic switching tube TP1A second electronic switch tube TP2Auxiliary electronic switch tube STp1And carrying out pressure equalizing treatment.
To communicate with the first electronic switch tube TP1The voltage equalizer circuit 250 is connected as an example, and the voltage equalizer circuit is specifically connected. In one embodiment, the voltage equalizing circuit 250 includes a dynamic voltage equalizing capacitor C1, a dynamic voltage equalizing resistor R1, and a static voltage equalizing resistor R2. The input end of the dynamic voltage-sharing resistor R1 and the first electronic switch tube TP1The output end of the dynamic voltage-sharing resistor R1 is connected with the input end of the dynamic voltage-sharing capacitor C1. The output end C1 of the dynamic voltage-sharing capacitor and the first electronic switch tube TP1Is connected to the cathode. The input end of the static voltage-sharing resistor R2 and the second endAn electronic switch tube TP1The output end of the static voltage-sharing resistor R2 is connected with the first electronic switching tube TP1Is connected to the cathode.
Fig. 7 is a schematic diagram of a circuit connection of the dual power switching device according to one embodiment of the present invention applied to a three-phase circuit.
In one embodiment, the three-phase circuit is an A phase, a B phase and a C phase. The power circuit, the auxiliary switch circuit, the bypass switch circuit and the voltage-sharing circuit in the phase A, the phase B and the phase C are all the same as those in a single-phase circuit in element constitution and connection mode. The configuration of the elements of the precharge circuit is the same as that of the elements of the precharge circuit in the single-phase circuit, but the connection mode of the input terminals of the precharge circuit is different. The input end of the pre-charging circuit in the phase A is connected with the main power supply of the phase C, the input end of the pre-charging circuit in the phase B is connected with the main power supply of the phase A, the input end of the pre-charging circuit in the phase C is connected with the main power supply of the phase B, and the pre-charging circuit is bridged between the two phases to form triangular connection among three phases.
In one embodiment, when the dual power switching device is applied to a single-phase circuit, the control module 300 collects power supply parameters of the primary power supply and the secondary power supply. When the power supply parameter of the main power supply is abnormal and the power supply parameter of the auxiliary power supply is normal, a first control instruction is output to the auxiliary switching module 200, so that the auxiliary switching module 200 controls the main power module 100 to disconnect a first power supply path between the main power supply and the load, and controls the main power module 100 to connect a second power supply path between the auxiliary power supply and the load.
In one embodiment, the supply parameter comprises a main supply voltage upAnd an auxiliary supply voltage uaThe control module 300 further collects power consumption parameters of the load, wherein the power consumption parameters include load voltage uLAnd a load current iL。
The control module 300 controls the sensor to acquire the main power supply voltage upAuxiliary power supply voltage uaLoad, and method of operating the sameVoltage uLAnd a load current iL. And the power states of the main power supply and the auxiliary power supply are respectively judged. If the main power supply is normal, the main power supply supplies power to the load; if the main power supply voltage upIf it is abnormal, the auxiliary power voltage u is determinedaWhether it is abnormal. If the auxiliary power supply voltage uaAnd if the current state is normal, controlling to disconnect a first power supply path between the main power supply and the load, and controlling the main power module 100 to connect a second power supply path between the auxiliary power supply and the load.
In one embodiment, the process of disconnecting the first power path between the main power source and the load and controlling the main power module 100 to connect the second power path between the auxiliary power source and the load is as follows. The control module 300 controls to turn off the driving signal of the electronic switch tube in the power loop connected with the main power supply and simultaneously controls the load current iLThe size of (2) is judged. When the load current iL>0, triggering the auxiliary electronic switch tube ST connected with the main power supplyp1Conducting to provide the first electronic switch tube TP1Turning off the required reverse voltage to make the first electronic switch tube TP1The reverse voltage is borne to cut off and disconnect; when the load current iL<0, triggering the auxiliary electronic switch tube ST connected with the main power supplyp2Conducting to provide the second electronic switch tube TP1Turning off the required reverse voltage to make the second electronic switch tube TP2The back pressure is borne to cut off the disconnection. Waiting for a set time, wherein the set time is 200 μ s-300 μ s, to ensure that the first electronic switch tube TP in the main power module 1001And the second electronic switching tube TP2And completely closed.
After a first power supply path between the main power supply and the load is completely closed, the current u is subjected to voltage regulationa-uLAnd iLThe polarity of (c) is judged:
when u isa-uL>0, and iL>At 0, triggering a first electronic switch tube T in a power circuit connected with the auxiliary power supplya1Conducting;
when u isa-uL<0, and iL<At 0, triggering a second electronic switch tube T in a power circuit connected with the auxiliary power supplya2Conducting;
the switching can be completed to turn on the second power supply path between the auxiliary power supply and the load.
When u isa-uL<0, and iL>0 or ua-uL>0, and iL<At 0, wait for the load current iLResulting in zero crossings.
Waiting for a set time again, the set time being 500-800 mus, and ensuring the first electronic switch tube TP in the main power module 100 again1And the second electronic switching tube TP2And completely closed.
After the first power supply path between the main power supply and the load is completely closed, the u is turned off againa-uLAnd iLThe polarity of (c) is judged.
When u isa-uL>0, and iL>At 0, triggering a first electronic switch tube T in a power circuit connected with the auxiliary power supplya1Conducting;
when u isa-uL<0, and iL<At 0, triggering a second electronic switch tube T in a power circuit connected with the auxiliary power supplya2Conducting;
the switching can be completed to turn on the second power supply path between the auxiliary power supply and the load.
In one embodiment, when the dual power switching device is applied to a three-phase circuit, the switching process between the main power supply and the auxiliary power supply in each phase is the same as the power switching process when applied to a single-phase circuit as described above.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (9)
1. A dual power switching apparatus for switching between a primary power source and a secondary power source for powering a load, the apparatus comprising:
the main power module is respectively connected with the main power supply, the auxiliary power supply and the load and is used for switching on or switching off a first power supply path between the main power supply and the load or switching on or switching off a second power supply path between the auxiliary power supply and the load;
the auxiliary switching module is connected with the main power module and used for receiving a control instruction and outputting an electric signal for controlling the on-off of the main power module to the main power module according to the control instruction so as to selectively switch the main power supply or the auxiliary power supply to supply power to the load;
and the control module is respectively connected with the main power supply, the auxiliary power supply, the load and the auxiliary switching module, and is used for acquiring power supply parameters of the main power supply and the auxiliary power supply and outputting the control instruction according to the power supply parameters.
2. The dual power switching device of claim 1, wherein the primary power module comprises: two power circuits, one of which is connected to the main power supply and the load, and one of which is connected to the auxiliary power supply and the load, respectively,
the power circuit includes:
the electronic switch group is used for switching on or switching off the first power supply path or the second power supply path according to the electric signal output by the auxiliary switching module;
the mechanical switch group is connected with the electronic switch group in series and is used for assisting in turning on or turning off a power supply path where the power circuit is located;
and the voltage protector is connected with the electronic switch group in parallel and is used for adjusting the voltage of the power circuit and adjusting the voltage to a preset voltage range.
3. The dual power switching device of claim 2, wherein the electronic switch set comprises at least one pair of first and second electronic switch tubes connected in anti-parallel.
4. The dual power switching device of claim 3, wherein the auxiliary switching module comprises two auxiliary switching circuits, one of the auxiliary switching circuits being connected in parallel with one of the electronic switch sets;
the auxiliary switch circuit is used for providing on-off reverse voltage for the electronic switch group.
5. The dual-power-supply switching device of claim 4, wherein the auxiliary switching circuit comprises an auxiliary capacitor, an auxiliary reactor and an auxiliary electronic switching tube connected in series in sequence, wherein one end of the auxiliary capacitor is connected to the input end of the electronic switching group, and the cathode of the auxiliary electronic switching tube is connected to the output end of the electronic switching group.
6. The dual power supply switching device of claim 5, wherein the auxiliary switching module further comprises a pre-charging circuit connected to the auxiliary switching circuit, an input of the pre-charging circuit is connected to the main power supply or the auxiliary power supply, and an output of the pre-charging circuit is connected to the auxiliary capacitor for charging the auxiliary capacitor in the auxiliary switching circuit.
7. The dual power supply switching device according to claim 6, wherein the pre-charge circuit comprises an overvoltage limiter, a resistor and a diode connected in series in this order, wherein one end of the overvoltage limiter is connected to the main power supply or the auxiliary power supply as the input end of the pre-charge circuit, and the cathode of the diode is connected to the auxiliary capacitor as the output end of the pre-charge circuit.
8. The dual power supply switching device according to claim 1, further comprising:
and the bypass switch circuit is connected with the main power module and is used for bypassing the main power module when the main power module fails or is overhauled.
9. The dual power switching device of claim 5, further comprising a plurality of voltage equalizing circuits respectively connected to the first electronic switch tube, the second electronic switch tube, and the auxiliary electronic switch tube in a one-to-one correspondence, for performing voltage equalizing processing on the first electronic switch tube, the second electronic switch tube, and the auxiliary electronic switch tube.
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| CN201921857123.1U CN210839058U (en) | 2019-10-31 | 2019-10-31 | Double-power switching device |
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| CN201921857123.1U CN210839058U (en) | 2019-10-31 | 2019-10-31 | Double-power switching device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635565A (en) * | 2019-10-31 | 2019-12-31 | 广州供电局有限公司 | Dual power supply switching device and dual power supply switching control method |
| CN112583007A (en) * | 2020-12-08 | 2021-03-30 | 西安爱科赛博电气股份有限公司 | Fast solid state transfer switch control strategy and system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635565A (en) * | 2019-10-31 | 2019-12-31 | 广州供电局有限公司 | Dual power supply switching device and dual power supply switching control method |
| CN112583007A (en) * | 2020-12-08 | 2021-03-30 | 西安爱科赛博电气股份有限公司 | Fast solid state transfer switch control strategy and system |
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Effective date of registration: 20200921 Address after: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee after: Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd. Address before: 510620 Tianhe District, Guangzhou, Tianhe South Road, No. two, No. 2, No. Patentee before: GUANGZHOU POWER SUPPLY Co.,Ltd. |