CN111277041A - Dual-power automatic transfer switch and control method thereof - Google Patents
Dual-power automatic transfer switch and control method thereof Download PDFInfo
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- CN111277041A CN111277041A CN202010083283.6A CN202010083283A CN111277041A CN 111277041 A CN111277041 A CN 111277041A CN 202010083283 A CN202010083283 A CN 202010083283A CN 111277041 A CN111277041 A CN 111277041A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/061—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for DC powered loads
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
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Abstract
The invention relates to a dual-power automatic transfer switch, which comprises a main power interface, a standby power interface, an output interface and a power transfer control circuit, wherein the main power interface is connected with the standby power interface; the power supply conversion control circuit comprises a controller, a main rectifier, a standby rectifier, a direct current bus, an energy storage device and a load inverter; the alternating current sides of the main rectifier and the standby rectifier are respectively connected with a main power interface and a standby power interface, and the direct current sides of the main rectifier and the standby rectifier are both connected with a direct current bus; the energy storage device is connected with the direct current bus, and an anti-reversion device is arranged on a connected line; the direct current side of the load inverter is connected with a direct current bus, and the alternating current side of the load inverter is connected with an output interface; the controller is connected with a main power supply detection device and is connected with coil parts of a first relay and a second relay, and contact parts of the first relay and the second relay are respectively arranged on lines of a direct current side connecting direct current bus of the main rectifier and the standby rectifier. The technical scheme provided by the invention can solve the problem that the working stability of the load is influenced when the power supply is switched by the alternating current load.
Description
Technical Field
The invention belongs to the technical field of dual-power supply control, and particularly relates to a dual-power automatic transfer switch and a control method thereof.
Background
In order to meet the continuous power supply requirements of the electric equipment, a two-way power supply scheme is generally adopted, namely, a dual-power automatic conversion device is utilized to realize the automatic switching of a main power supply and a standby power supply.
The dual-power automatic switching device generally comprises a detection unit, a control unit and a dual-power change-over switch, wherein the detection unit is used for detecting whether a main power supply and a standby power supply are abnormal, and the control unit controls the dual-power change-over switch according to a detection result of the detection unit so as to realize the automatic switching of the main power supply and the standby power supply.
In the conventional dual-power automatic switching device, during the power switching process, the execution logic of the dual-power switch is firstly disconnected and then closed, namely, the main power supply is firstly disconnected and then the standby power supply is connected, so that short power failure occurs (the switching time of a traditional mechanical switch is usually tens of milliseconds), and the short power failure is acceptable for most loads. However, there are some high-sensitive loads, which have very strict requirements on the continuity of power supply, and need to be restarted once the power supply is interrupted, and data loss, work interruption and the like are likely to occur in the restarting process, which may cause serious influence on the normal operation of the load.
In order to enable the dual power automatic switching device to meet the requirement of a high sensitive load, one existing solution is to use a controllable semiconductor switch as a dual power change-over switch to increase the switching speed of two paths of power supplies. Although the scheme can greatly reduce the conversion time of two paths of power supplies, a heat dissipation system needs to be designed for the semiconductor switch independently, so that the cost of the system is increased; in addition, the semiconductor device works for a long time, and the service life and the reliability of the semiconductor device are reduced compared with those of a traditional mechanical dual-power switch, so that the safety and the reliability of the whole power supply system are influenced.
In order to solve the above problems, chinese patent with the publication number of CN105024450B discloses a dual power supply automatic switching device, a switching control method thereof, and a dual power supply system, wherein a semiconductor device is used as a switch in the process of switching the dual power supplies, thereby ensuring the continuity of power supply and solving the problems of high cost and low safety and reliability caused by long-time operation of the semiconductor.
For an alternating current load, not only the problem of power supply continuity but also the problem of phase needs to be considered in the power supply switching process, especially for the alternating current load with three-phase power supply, if the phase of the voltage in the power supply line changes suddenly when the power supply is switched, the stability of the load operation is affected, and even the load is damaged.
Disclosure of Invention
The invention aims to provide a dual-power automatic transfer switch and a control method thereof, which are used for solving the problem that the working stability of a load is influenced when an alternating current load is switched over a power supply in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dual-power automatic transfer switch comprises a main power interface, a standby power interface, an output interface and a power transfer control circuit; the power supply conversion control circuit comprises a controller, a main rectifier, a standby rectifier, a direct current bus, an energy storage device and a load inverter; the alternating current sides of the main rectifier and the standby rectifier are respectively connected with the main power supply interface and the standby power supply interface, and the direct current sides of the main rectifier and the standby rectifier are both connected with a direct current bus; the energy storage device is connected with the direct current bus, and an anti-reverse device for preventing the current of the direct current bus from flowing back to the energy storage device is arranged on a connected line; the direct current side of the load inverter is connected with a direct current bus, and the alternating current side of the load inverter is connected with an output interface; the controller is connected with a main power supply detection device for detecting whether a main power supply is abnormal or not and is connected with coil parts of a first relay and a second relay, and contact parts of the first relay and the second relay are respectively arranged on a line of a direct current side connecting direct current bus of the main rectifier and the standby rectifier; the controller detects whether the main power supply is abnormal through the main power supply detection device, and controls the working states of the first relay and the second relay according to whether the main power supply is abnormal.
Furthermore, the anti-reverse device is connected with a contact part of the third relay in parallel, the controller is connected with a coil part of the third relay and is connected with an electric quantity detection device for detecting the residual electric quantity of the energy storage device, and the working state of the third relay is controlled according to data detected by the electric quantity detection device.
Further, the electric quantity detection device is a voltage detection device for detecting the open-circuit voltage of the energy storage device, and the controller calculates the residual electric quantity of the energy storage device according to the open-circuit voltage of the energy storage device.
Furthermore, the voltage output by the alternating current side of the load inverter is three-phase alternating current voltage, a single-phase inverter bridge is arranged, the direct current side of the single-phase inverter bridge is connected with a direct current bus, the alternating current side of the single-phase inverter bridge is connected with the movable end of a selector switch, the immovable end of the selector switch is respectively connected with each phase of the alternating current side of the load inverter, and the controller is connected with a voltage transformer for detecting each phase voltage of the alternating current side of the inverter and is connected with the control end of the selector switch.
Furthermore, the voltage output by the alternating current side of the load inverter is a three-phase alternating current voltage, the controller is connected with a voltage transformer for detecting each phase voltage on the alternating current side of the inverter and an active filter for providing reactive compensation for detecting the alternating current side of the inverter, and a power supply end of the active filter is connected with the direct current bus.
Further, the main power detection device is a voltage transformer for detecting the voltage of the main power interface, or a voltage sensor for detecting the voltage of the direct current bus.
Further, the controller is also connected with a standby power supply detection device for detecting whether the standby power supply is abnormal or not, and when the main power supply is abnormal, if the standby power supply is also abnormal, the contact parts of the first relay and the second relay are controlled to be disconnected.
Furthermore, the controller is also connected with an indicating device for displaying whether the main power supply is abnormal or not.
The controller is connected with the heat dissipation device and connected with the temperature sensor, and is used for controlling the working state of the heat dissipation device according to the temperature signal detected by the temperature sensor.
A control method of the double-power-supply automatic transfer switch comprises the following steps:
detecting whether the main power supply is abnormal or not;
if the main power supply is not abnormal, the contact part of the first relay is controlled to be closed, and the contact part of the second relay is controlled to be opened;
if the main power supply is abnormal, the contact part of the first relay is controlled to be opened, and then the contact part of the second relay is controlled to be closed.
The invention has the beneficial effects that: according to the technical scheme provided by the invention, when the main power supply is normal, the main power supply supplies power to the direct current bus, when the main power supply is abnormal, the main power supply is switched to the standby power supply to supply power to the direct current bus, and the storage battery supplies power to the direct current bus in the switching process, so that the continuity of load power supply is ensured. And the phase change on the load power supply circuit can not be influenced in the switching process, so that the stability of the load work can not be influenced, and the problem that the stability of the load work is influenced when the power supply is switched by the alternating current load in the prior art is solved.
Drawings
FIG. 1 is a schematic diagram of a switching circuit in an embodiment of the switch of the present invention;
fig. 2 is a schematic structural diagram of a switching circuit provided with a relay K4 in the switch embodiment of the invention;
fig. 3 is a schematic structural diagram of an inverter provided with a single-phase inverter circuit in the switching embodiment of the present invention;
fig. 4 is a schematic diagram of an inverter provided with an active filter in the switching embodiment of the present invention;
FIG. 5 is a schematic diagram of the circuit configuration of an indicator light in an embodiment of the switch of the present invention;
fig. 6 is a schematic structural diagram of a heat dissipation device provided in the switch embodiment of the present invention.
Detailed Description
Switch embodiment:
the embodiment provides a dual-power automatic transfer switch for controlling the switching of an alternating current load power supply and solving the problem that the alternating current load influences the working stability of the load when the power supply is switched in the prior art.
The dual power transfer switch provided by this embodiment has a structure as shown in fig. 1, and includes a main power interface, a backup power interface, an output interface, and a switching control circuit, where the main power interface is used to connect to a main power, the backup power interface is used to connect to a backup power, and the output interface is used to connect to a load.
The switching control circuit comprises a controller, a main rectifier, a standby rectifier, a storage battery, a load inverter and a direct current bus. The alternating current side of the main rectifier is connected with a main power interface, the direct current side of the main rectifier is connected with a direct current bus, and a contact part of the relay K1 is arranged on a line of the direct current side of the main rectifier, which is connected with the direct current bus. The alternating current side of the standby rectifier is connected with the standby power interface, the direct current side of the standby rectifier is connected with the direct current bus, and the contact part of the relay K2 is arranged on a line of the direct current side of the standby rectifier, which is connected with the direct current bus. The storage battery is connected with the direct current bus, and the anti-reverse diode D0 is arranged on a line of the storage battery connected with the direct current bus. The direct current side of the load inverter is connected with a direct current bus, the alternating current side of the load inverter is connected with an output interface, and the contact part of the relay K3 is arranged on a line of the direct current side of the load inverter, which is connected with the direct current bus.
The controller is connected with contact parts of the relay K1, the relay K2 and the relay K3 and is connected with a first voltage transformer PT1 and a second voltage transformer PT2, the first voltage transformer PT1 is arranged on a line between the main power interface and the main inverter, and the second voltage transformer PT2 is arranged on a line between the standby power interface and the standby inverter. The controller detects the voltage of the main power supply interface through the first voltage transformer PT1 and detects the voltage of the standby power supply interface through the second voltage transformer PT2, and therefore whether the main power supply and the standby power supply are abnormal or not is judged.
In this embodiment, the controller is configured to control the operating state of the switching circuit, and the control method includes:
the controller controls the relay K1 and the relay K3 to be closed; after the relay K1 is closed, the main power supply is connected with the direct current bus, and the main rectifier rectifies alternating current of the main power supply into direct current and supplies power to the direct current bus, so that the voltage value of the direct current bus is stabilized at a first set voltage value; after the relay K3 is closed, the load is connected with the direct current bus, and the load inverter takes power from the direct current bus and supplies power to the load after inverting the power into alternating current;
the controller detects the voltage of the main power supply through a first potential transformer PT1 and the voltage of the backup power supply through a second potential transformer PT 2. When the controller detects that the voltage of the main power supply or the voltage of the standby power supply is lower than a third set voltage value, judging that the main power supply or the standby power supply is abnormal; when the controller judges that the main power supply is abnormal and the standby power supply is not abnormal, the relay K1 is controlled to be switched off, and the relay K2 is controlled to be switched on;
after the relay K2 is closed, the standby power supply is connected with the direct-current bus, and the standby rectifier rectifies alternating current of the standby power supply into direct current and supplies power to the direct-current bus, so that the voltage value of the direct-current bus is continuously stabilized at a first set voltage value;
in the time between the opening of the relay K1 and the closing of the relay K2, the main power supply and the auxiliary power supply cannot supply power to the direct-current bus continuously, so that the voltage of the direct-current bus is reduced; and when the voltage value of the direct current bus is reduced to a second set voltage value, the storage battery supplies power to the direct current bus, so that the voltage of the direct current bus is stabilized at the second set voltage value.
The first set voltage value is the voltage value of the direct current bus when the main power supply or the standby power supply supplies power to the direct current bus, the second set voltage value is the voltage value of the storage battery, the first set voltage value is larger than the second set voltage value, the storage battery supplies power to the direct current bus in the process of switching the standby power supply by the main power supply, although the power supply voltage of a load is reduced, the load cannot be powered off, and the direct current bus can still work normally. When the main power supply or the standby power supply is connected with the direct current bus, the voltage of the direct current sides of the main rectifier and the standby rectifier is higher than the voltage output by the storage battery, so that the voltage of the direct current bus can be stabilized at a first set voltage value, and the storage battery stops supplying power for the direct current bus.
When the standby power supply is connected with the direct current bus and supplies power to the direct current bus, if the controller detects that the standby power supply is abnormal through the second voltage transformer PT2, the contact part of the relay K2 is controlled to be disconnected.
An electric quantity detecting device is arranged at the storage battery, the controller is connected with the voltage detecting device and is connected with a coil part of a relay K4, and a contact part of a relay K4 is arranged in parallel with an anti-reverse diode K2 as shown in figure 2. The controller detects the electric quantity of the storage battery through the electric quantity detection device, when a main power supply or a standby power supply supplies power to the direct current bus, if the electric quantity of the storage battery is lower than the set electric quantity, the contact part of the relay K4 is controlled to be closed, the storage battery is connected with the direct current bus, and the storage battery is charged after the direct current bus gets electricity.
The electric quantity detection device in the embodiment is a voltage sensor, the voltage sensor is used for detecting the open-circuit voltage of the storage battery, and the controller detects the residual electric quantity of the storage battery by adopting an open-circuit voltage method; as another embodiment, the power detection device may be a current sensor for detecting a current on a charge/discharge line of the storage battery, and the controller calculates the remaining power of the storage battery by an ampere-hour integration method.
The load inverter in this embodiment outputs two-phase ac power at the ac side to power two-phase ac equipment. As another embodiment, the load inverter may be a load inverter that outputs three-phase ac power on the ac side, and as shown in fig. 3, the load inverter includes a bridge inverter circuit including a thyristor Q11, a thyristor Q12, a thyristor Q13, a thyristor Q14, a thyristor Q15, and a thyristor Q16, and a freewheeling diode D11, a freewheeling diode D12, a freewheeling diode D13, a freewheeling diode D14, a freewheeling diode D15, and a freewheeling diode D16 are respectively connected in parallel to the thyristor Q11, the thyristor Q12, the thyristor Q13, the thyristor Q14, the thyristor Q15, and the thyristor Q16. The controller is connected with the control ends of the thyristors Q11, Q12, Q13, Q14, Q15 and Q16, and controls the on-off of the thyristors Q11, Q12, Q13, Q14, Q15 and Q16 through PWM waves, so that direct current obtained from the direct current bus is inverted into three-phase alternating current for supplying power to the load.
The load inverter also comprises a single-phase inverter bridge formed by a thyristor Q21 and a thyristor Q22, the direct current side of the single-phase inverter bridge is connected with a direct current bus, the alternating current side of the single-phase inverter bridge is connected with the movable end of a selector switch K5, and the selector switch K5 is provided with three immovable ends which are respectively connected with three phases on the alternating current side of the load inverter. The controller is connected with the control end of the selector switch K5 and is connected with a third voltage transformer PT3, the third voltage transformer PT3 is arranged on the AC side of the load inverter and is used for detecting whether three-phase AC output by the AC side of the load inverter is abnormal or not, if one phase of the three-phase AC output is abnormal, the corresponding switch in the selector switch K5 is controlled to act, and the corresponding bridge arm in the load inverter is replaced by a one-way inverter bridge.
As shown in fig. 4, the controller controls the active filter to perform reactive compensation on the voltage output by the ac side of the load inverter according to a third voltage transformer PT 3.
The controller of this embodiment is further connected with an indicator light, the connection mode is as shown in fig. 5, the indicator light comprises a first indicator light L1 and a second indicator light L2, the base electrodes of a triode Q1 and a triode Q2 are connected with the controller, the emitter electrode is grounded, and the collector electrode is connected with the power supply. The first indicator light L1 and the first current limiting resistor R1 are arranged on a line of a power supply connected with the collector of the triode Q1, and the second indicator light L2 and the second current limiting resistor R2 are arranged on a line of a power supply connected with the collector of the triode Q2. When the main power supply is abnormal, the triode Q1 is switched on, and the first indicator lamp L1 emits light; when the standby power supply is abnormal, the trigger triode Q2 is conducted, and the second indicator light L2 emits light.
In this embodiment, the controller is further connected to a temperature sensor and a heat radiation fan, as shown in fig. 6, a contact portion of the relay K6 is provided on a line connecting the heat radiation fan M to a power supply, the controller is connected to a coil portion of the relay K6, and the contact portion of the relay K6 is controlled to be closed and opened according to a signal detected by the temperature sensor, thereby controlling the operating state of the heat radiation fan M.
The method comprises the following steps:
the present embodiment provides a control method of a dual-power automatic transfer switch, which is the same as the control method of the dual-power automatic transfer switch in the switch embodiment described above, and the control method is described in detail in the switch embodiment described above, and will not be described here.
The embodiments of the present invention disclosed above are intended merely to help clarify the technical solutions of the present invention, and it is not intended to describe all the details of the invention nor to limit the invention to the specific embodiments described. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (10)
1. A dual-power automatic transfer switch comprises a main power interface, a standby power interface, an output interface and a power transfer control circuit; the power conversion control circuit is characterized by comprising a controller, a main rectifier, a standby rectifier, a direct current bus, an energy storage device and a load inverter; the alternating current sides of the main rectifier and the standby rectifier are respectively connected with the main power supply interface and the standby power supply interface, and the direct current sides of the main rectifier and the standby rectifier are both connected with a direct current bus; the energy storage device is connected with the direct current bus, and an anti-reverse device for preventing the current of the direct current bus from flowing back to the energy storage device is arranged on a connected line; the direct current side of the load inverter is connected with a direct current bus, and the alternating current side of the load inverter is connected with an output interface; the controller is connected with a main power supply detection device for detecting whether a main power supply is abnormal or not and is connected with coil parts of a first relay and a second relay, and contact parts of the first relay and the second relay are respectively arranged on a line of a direct current side connecting direct current bus of the main rectifier and the standby rectifier; the controller detects whether the main power supply is abnormal through the main power supply detection device, and controls the working states of the first relay and the second relay according to whether the main power supply is abnormal.
2. The dual-power automatic transfer switch of claim 1, wherein the anti-reverse device is connected in parallel with a contact portion of the third relay, the controller is connected to a coil portion of the third relay and is connected to a power detection device for detecting a remaining power of the energy storage device, and an operating state of the third relay is controlled according to data detected by the power detection device.
3. The dual-power automatic transfer switch of claim 2, wherein the power detection device is a voltage detection device for detecting an open circuit voltage of the energy storage device, and the controller calculates the remaining power of the energy storage device according to the open circuit voltage of the energy storage device.
4. The dual-power-supply automatic transfer switch of claim 1, wherein the voltage output by the ac side of the load inverter is a three-phase ac voltage, and a single-phase inverter bridge is provided, the dc side of the single-phase inverter bridge is connected to a dc bus, the ac side is connected to a moving end of a selector switch, a stationary end of the selector switch is connected to each phase of the ac side of the load inverter, and the controller is connected to a voltage transformer for detecting each phase voltage of the ac side of the inverter and to a control end of the selector switch.
5. The dual-power-supply automatic transfer switch according to claim 1, wherein the voltage output by the ac side of the load inverter is a three-phase ac voltage, a voltage transformer for detecting each phase voltage on the ac side of the inverter and an active filter for providing reactive compensation for detecting the ac side of the inverter are connected to the controller, and a power supply end of the active filter is connected to the dc bus.
6. The dual-power automatic transfer switch of claim 1, wherein the main power detection device is a voltage transformer for detecting a main power interface voltage or a voltage sensor for detecting a dc bus voltage.
7. The dual power supply automatic transfer switch of claim 1, wherein the controller is further connected with a backup power supply detection device for detecting whether the backup power supply is abnormal, and when the main power supply is abnormal, if the backup power supply is also abnormal, the contact portions of the first relay and the second relay are controlled to be opened.
8. The dual power supply automatic transfer switch of claim 1, wherein the controller is further connected with an indicating device for displaying whether the main power supply is abnormal.
9. The dual-power automatic transfer switch of claim 1, further comprising a heat sink, wherein the controller is connected to the heat sink and connected to the temperature sensor, for controlling the operating state of the heat sink according to the temperature signal detected by the temperature sensor.
10. A method for controlling the dual power automatic transfer switch according to any one of claims 1 to 9, comprising the steps of:
detecting whether the main power supply is abnormal or not;
if the main power supply is not abnormal, the contact part of the first relay is controlled to be closed, and the contact part of the second relay is controlled to be opened;
if the main power supply is abnormal, the contact part of the first relay is controlled to be opened, and then the contact part of the second relay is controlled to be closed.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112234706A (en) * | 2020-10-21 | 2021-01-15 | 华中科技大学 | Underground direct current power supply device and method |
| CN113991834A (en) * | 2021-11-24 | 2022-01-28 | 广东电网有限责任公司 | Uninterrupted DC double-power automatic change-over switch device |
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| CN103036308A (en) * | 2012-12-14 | 2013-04-10 | 华为技术有限公司 | Inverter, power source, method and device for controlling inverter auxiliary power supply (APS) |
| CN104617759A (en) * | 2015-01-31 | 2015-05-13 | 盐城工学院 | Phase redundancy three phase inverter fault tolerance circuit and control method thereof |
| CN206685965U (en) * | 2017-04-24 | 2017-11-28 | 无锡烯晶碳能新材料科技有限公司 | A kind of DC power system |
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2020
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103036308A (en) * | 2012-12-14 | 2013-04-10 | 华为技术有限公司 | Inverter, power source, method and device for controlling inverter auxiliary power supply (APS) |
| CN104617759A (en) * | 2015-01-31 | 2015-05-13 | 盐城工学院 | Phase redundancy three phase inverter fault tolerance circuit and control method thereof |
| CN206685965U (en) * | 2017-04-24 | 2017-11-28 | 无锡烯晶碳能新材料科技有限公司 | A kind of DC power system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112234706A (en) * | 2020-10-21 | 2021-01-15 | 华中科技大学 | Underground direct current power supply device and method |
| CN113991834A (en) * | 2021-11-24 | 2022-01-28 | 广东电网有限责任公司 | Uninterrupted DC double-power automatic change-over switch device |
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Application publication date: 20200612 |