Dual-power-supply transfer switch

Abstract

Embodiments of the present disclosure provide a dual-power-supply transfer switch, comprising a controller body and a power generator module. The controller body comprises: a power supply input unit adapted to be connected to a first power supply and a second power supply so as to rectify the power supplies; a first power supply conversion unit connected to the power supply input unit; a second power supply conversion unit connected to the first power supply conversion unit; a power supply state detection unit coupled to the first power supply and the second power supply so as to detect the working situations of the first power supply and the second power supply; a first relay connected to the first power supply conversion unit so that the first relay is powered by the output of the first power supply conversion unit, and connected to the power supply state detection unit so as to convert the operation state of the relay on the basis of the working situations of the power supplies; a motor connected to the relay so as to rotate, on the basis of the operation state of the relay, between positions corresponding to the first power supply and the second power supply; and a control unit connected to the second power supply conversion unit and capable of providing a power generation starting / stopping signal to the power generator module when connected to the power generator module.

Description

Dual power transfer switch

[0001] This application claims priority to Chinese utility model patent application number 202323599340.4, filed on December 27, 2023, and entitled “Dual Power Conversion Switch”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] Embodiments of the present disclosure generally relate to the field of electrical equipment, and more particularly, to a dual power transfer switch. Background Art

[0003] Dual power automatic transfer switches are primarily classified into two categories: dual circuit breaker dual power transfer switches (also known as CB-class dual power transfer switches) and integral dual power transfer switches (also known as PC-class dual power transfer switches). PC-class dual power transfer switches can connect and carry normal current and fault current, but cannot interrupt short-circuit current. CB-class dual power transfer switches include two circuit breakers and a transmission mechanism, and are equipped with an overcurrent release. Their main contacts can connect and interrupt short-circuit current. PC-class dual power transfer switches are increasingly popular due to their compact size and fast switching speed.

[0004] Dual power supply modes can be categorized as grid-to-grid and grid-to-generator. Both require detecting voltage loss, phase loss, overvoltage, or undervoltage on the standby power source to determine whether to issue a motor switchover command. Furthermore, the grid-to-generator mode requires issuing generation and unloading commands to start and stop the generator. Due to the small size and limited internal space of PC-grade dual power transfer switches, implementing these functional requirements within the controller itself is difficult.

[0005] Summary of the Invention

[0006] An object of the present disclosure is to provide a dual power transfer switch to at least partially solve the above and other potential problems.

[0007] In one aspect of the present disclosure, a dual power conversion switch is provided, comprising a controller body and a generator module connectable to the controller body, wherein the controller body comprises: a power input unit adapted to be connected to a first power source and a second power source to rectify the power sources; a first power conversion unit connected to the power input unit to perform voltage conversion on an output of the power input unit; a second power conversion unit connected to the first power conversion unit to perform voltage conversion on an output of the first power conversion unit; a power state detection unit coupled to the first power source and the second power source to detect operating conditions of the first power source and the second power source; a first relay connected to the first power conversion unit to be powered by the output of the first power conversion unit and connected to the power state detection unit to convert an operating state of the first relay according to the operating conditions of the first power source and the second power source; a motor connected to the first relay to rotate between a position corresponding to the first power source and a position corresponding to the second power source according to the operating state of the first relay; and a control unit connected to the second power conversion unit to be powered by the second power conversion unit and capable of providing a power generation start / stop signal to the generator module when connected to the generator module.

[0008] In some embodiments, the power state detection unit includes: a step-down unit adapted to step down the first power source and the second power source; and a voltage detection unit connected to the step-down unit to detect whether an abnormality occurs in the stepped-down voltage.

[0009] In some embodiments, the control unit is not connected to the generator module, the first power supply is a normal power supply and the second power supply is a backup power supply, wherein when the power status detection unit detects that the first power supply is abnormal and the second power supply is normal, the motor rotates to a position corresponding to the second power supply under the control of the first relay, and when the power status detection unit detects that the first power supply has returned to normal, the motor rotates to a position corresponding to the first power supply under the control of the first relay.

[0010] In some embodiments, the generator module is connected to the control unit of the controller body, the first power supply is a common power supply, and the second power supply is a generator, wherein when the power status detection unit detects that the first power supply is abnormal, the control unit changes the power generation start and stop signal after the start delay time of the generator to control the start of the generator, and when the output voltage of the second power supply rises to a predetermined voltage, the motor rotates to a position corresponding to the second power supply under the control of the first relay, and wherein when the power status detection unit detects that the first power supply returns to normal, the motor rotates to a position corresponding to the first power supply under the control of the first relay, and the control unit changes the power generation start and stop signal after the stop delay time of the generator to control the stop of the generator.

[0011] In some embodiments, the generator module includes a generator start / stop unit connected to the control unit and receiving the power generation start / stop signal from the control unit to start or stop the generator.

[0012] In some embodiments, the generator start-stop unit includes: a peripheral circuit for receiving the power generation start-stop signal; a second relay connected to the peripheral circuit to operate under the drive of the peripheral circuit; and a switching circuit connected to the generator to start or stop the generator under the control of the second relay.

[0013] In some embodiments, the peripheral circuit includes: a diode connected in parallel with the second relay, the cathode of the diode coupled to the positive power supply voltage; a transistor, the collector of which is connected to the anode of the diode and the emitter of which is connected to ground; a first resistor, one end of which receives the power generation start and stop signal and the other end of which is connected to the base of the transistor; and a second resistor, one end of which is connected to the base of the transistor and the other end of which is connected to the emitter of the transistor.

[0014] In some embodiments, the generator module further includes: a delay setting unit, connected to the control unit to provide a first delay setting signal and a second delay setting signal to the control unit, the first delay setting signal being used to set the start delay time, and the second delay setting signal being used to set the stop delay time, wherein when the power supply status detection unit detects that the first power supply is abnormal, the control unit changes the power generation start and stop signal after the start delay time so that the generator start and stop unit controls the generator to start, and wherein when the power supply status detection unit detects that the first power supply has returned to normal, the control unit changes the power generation start and stop signal after the stop delay time so that the generator start and stop unit controls the generator to stop.

[0015] In some embodiments, the delay setting unit includes: a first sliding rheostat, whose first terminal is coupled to a positive power supply voltage, whose second terminal is connected to ground, and whose sliding end is connected to the control unit to provide the first delay setting signal to the control unit; a first capacitor, connected between the sliding end of the first sliding rheostat and ground; a second sliding rheostat, whose first terminal is coupled to the positive power supply voltage, whose second terminal is connected to ground, and whose sliding end is connected to the control unit to provide the second delay setting signal to the control unit; and a second capacitor, connected between the sliding end of the second sliding rheostat and ground.

[0016] In some embodiments, the generator module further includes: an indication unit connected to the control unit to provide an indication signal to the control unit for indicating that the generator module is connected to the controller body.

[0017] In some embodiments, the generator module further includes: an alarm unit connected to the control unit to alarm when the power status detection unit detects that the first power source or the second power source is abnormal.

[0018] According to the embodiments of the present disclosure, the controller itself can be used in a grid-to-grid dual power connection mode without connecting the generator module to the controller body, maintaining grid-to-grid functionality and providing ease of use and low cost. Furthermore, when the dual power connection mode is grid-to-generator, simply connecting the generator module to the controller body enables generator start / stop functions and the additional function of setting a transfer delay.

[0019] It should be understood that the content described in this content section is not intended to limit the key features or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. In the accompanying drawings, the same or similar reference numerals represent the same or similar elements, wherein:

[0021] FIG1 shows a schematic block diagram of a dual power conversion switch according to some embodiments of the present disclosure;

[0022] FIG2 shows a schematic diagram of an interface of a control unit according to some embodiments of the present disclosure;

[0023] FIG3 shows a circuit schematic diagram of a generator start-stop unit according to some embodiments of the present disclosure;

[0024] FIG4 shows a circuit schematic diagram of a delay setting unit according to some embodiments of the present disclosure; and

[0025] FIG5 shows a schematic diagram of an interface of an indication unit according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although preferred embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] As used herein, the term "including" and its variations represent open inclusion, i.e., "including but not limited to." Unless otherwise stated, the term "or" means "and / or." The term "based on" means "based at least in part on." The terms "one example embodiment" and "an embodiment" mean "at least one example embodiment." The term "another embodiment" means "at least one additional embodiment." The terms "first," "second," etc. may refer to different or identical objects.

[0028] As mentioned above, due to the small size and limited internal space of PC-grade dual-power transfer switches, it is difficult to implement functions that cover multiple networking modes within the controller itself. To address this issue, a conventional solution is to use an external power generation module to address grid-to-generator mode applications. However, since this design is monolithic, the controller itself cannot perform basic functions without the power generation module connected, making it inconvenient and cost-effective.

[0029] Embodiments of the present disclosure provide a dual-power transfer switch comprising a controller body and a generator module, which can be used together or separately. Without connecting the generator module to the controller body, the controller body can be used alone in a grid-to-grid dual-power connection, leaving grid-to-grid functionality unaffected. When the dual-power connection is grid-to-generator, simply connecting the generator module to the controller body enables generator start / stop functionality and an additional transfer delay time setting function. The principles of the present disclosure will be explained in detail below with reference to Figures 1 to 5.

[0030] FIG1 shows a schematic block diagram of a dual power transfer switch according to some embodiments of the present disclosure. As shown in FIG1 , the dual power transfer switch described herein generally includes a controller body 10 and a generator module 20 that can be connected to the controller body 10. The controller body 10 and the generator module 20 can be implemented as separate modules and softly connected via wires. Without the generator module 20 connected to the controller body 10, the controller body 10 can be used alone for a grid-to-grid dual power connection. However, with the generator module 20 connected to the controller body 10, the dual power transfer switch can be used for a grid-to-generator dual power connection.

[0031] In some embodiments, as shown in FIG1 , the controller body 10 includes a first input terminal 101 and a second input terminal 102. The first input terminal 101 is used to connect to a first power source, and the second input terminal 102 is used to connect to a second power source. When the generator module 20 is not connected to the controller body 10, the first power source can be a normal power source, and the second power source can be a backup power source. When the generator module 20 is connected to the controller body 10, the first power source can be a normal power source, and the second power source can be a generator.

[0032] In some embodiments, as shown in FIG1 , the controller body 10 further includes a power input unit 11 , a first power conversion unit 12 , a second power conversion unit 13 , a control unit 14 , a power status detection unit 15 , a first relay 16 and a motor 17 .

[0033] The power input unit 11 can be connected to the first input terminal 101 and the second input terminal 102, thereby connecting to the first and second power supplies to rectify the power. The power input unit 11 can convert the power received from the first and second power supplies from AC to DC. As an example, the power input unit 11 can include a rectifier bridge composed of diodes. In some embodiments, the power input unit 11 can also perform other processing on the first and second power supplies, such as filtering.

[0034] The first power conversion unit 12 is connected to the power input unit 11 to convert the voltage of the output of the power input unit 11. The first power conversion unit 12 can step down the power from the first power source and the second power source to provide a stepped-down voltage for powering the first relay 16. In one embodiment, the first power conversion unit 12 can output a 12V DC voltage. In other embodiments, the first power conversion unit 12 can output other voltage levels based on design requirements.

[0035] It should be noted that the numbers, values, etc. mentioned above and elsewhere in this disclosure are exemplary and are not intended to limit the scope of this disclosure in any way. Any other appropriate numbers and values ​​are possible.

[0036] The second power conversion unit 13 is connected to the first power conversion unit 12 to convert the output voltage of the first power conversion unit 12, thereby obtaining the operating voltage of the control unit 14. In one embodiment, the second power conversion unit 13 can convert the output of the first power conversion unit 12 to a voltage of 3.3V. Similarly, the second power conversion unit 13 can output other voltage levels according to design requirements.

[0037] The power supply status detection unit 15 is coupled to the first power supply and the second power supply to detect the operating conditions of the first power supply and the second power supply. In some embodiments, the power supply status detection unit 15 can detect at least one of voltage loss, phase loss, overvoltage or undervoltage of the first power supply and the second power supply. In addition, the power supply status detection unit 15 can also detect other operating conditions of the first power supply and the second power supply to determine whether the first power supply and the second power supply are in a normal state or an abnormal state.

[0038] In some embodiments, as shown in FIG1 , the power state detection unit 15 includes a step-down unit 151 and a voltage detection unit 152. The step-down unit 151 is configured to step down the voltage of the first power source and the second power source. The step-down unit 151 may include various conventional step-down circuits. The voltage detection unit 152 is connected to the step-down unit 151 to detect whether an abnormality occurs in the stepped-down voltage. The voltage detection unit 152 may provide the detection result to the first relay 16.

[0039] The first relay 16 is connected to the first power conversion unit 12 to be powered by the output of the first power conversion unit 12. The first relay 16 is also connected to the power state detection unit 15 to switch the operation state of the first relay 16 according to the operating conditions of the first power source and the second power source.

[0040] The motor 17 is connected to the first relay 16 and rotates between a position corresponding to the first power source and a position corresponding to the second power source according to the operating state of the first relay 16. When the motor 17 rotates to the position corresponding to the first power source, the first power source is connected to the power consumption device to supply power. When the motor 17 rotates to the position corresponding to the second power source, the second power source is connected to the power consumption device to supply power.

[0041] As described above, when the generator module 20 is not connected to the controller body 10, the control body 10 can be used alone in a grid-grid dual power supply networking mode. In this case, the first power supply can be a normal power supply, such as a mains power supply, and the second power supply can be a backup power supply, such as an uninterruptible power supply (UPS power supply). If the power supply status detection unit 15 detects that the first power supply is abnormal and the second power supply is normal, the first relay 16 changes the operating state so that the motor 17 rotates to a position corresponding to the second power supply, thereby using the second power supply to power the electrical device. If the power supply status detection unit 15 detects that the first power supply has returned to normal, the first relay 16 changes the operating state so that the motor 17 rotates to a position corresponding to the first power supply, and the first power supply is used again to power the electrical device.

[0042] The control unit 14 is connected to the second power conversion unit 13 to be powered by the second power conversion unit 13. When the controller body 10 is connected to the generator module 20, the control unit 14 can provide a power generation start / stop signal to the generator module 20 to control the start / stop operation of the generator.

[0043] In some embodiments, as shown in Figure 1, a generator module 20 can be connected to the control unit 14 of the controller body 10. When the generator module 20 is connected to the controller body 10, the dual power transfer switch can be used in a grid-generator dual power supply network. In this case, the first power source is a common power source, such as the mains, and the second power source is the generator. This operating mode of the dual power transfer switch will be described below.

[0044] FIG2 shows a schematic diagram of an interface of the control unit 14 according to some embodiments of the present disclosure. In some embodiments, the control unit 14 can be implemented as a microcontroller (MCU), also known as a single-chip microcomputer. In other embodiments, the control unit 14 can be implemented in other forms.

[0045] In some embodiments, as shown in FIG2 , the control unit 14 includes multiple interfaces for transmitting corresponding signals, such as a first positive power supply voltage +12V, a ground GND, a second positive power supply voltage VCC, an indication signal MODE, a power generation start / stop signal GenDrv1, a first delay setting signal NtoRDelay, and a second delay setting signal RtoNDelay. The first delay setting signal NtoRDelay is used to set the generator start delay time, and the second delay setting signal RtoNDelay is used to set the generator stop delay time.

[0046] In some embodiments, if the power status detection unit 15 detects an abnormality in the first power supply, the control unit 14 may change the power generation start / stop signal after the generator's start delay time to control the generator's start. After the generator starts, if the power status detection unit 15 detects that the generator's output voltage has increased to a predetermined voltage, the motor 17 may rotate to a position corresponding to the second power supply under the control of the first relay 16, thereby utilizing the generator to power the electrical device. If the power status detection unit 15 detects that the first power supply has returned to normal, the motor 17 may rotate to a position corresponding to the first power supply under the control of the first relay 16, thereby utilizing the first power supply to power the electrical device, and after the generator's stop delay time, the control unit 14 may change the power generation start / stop signal to control the generator's stop.

[0047] In some embodiments, as shown in FIG. 1 , the generator module 20 includes a generator start / stop unit 22 . The generator start / stop unit 22 is connected to the control unit 14 and receives a generator start / stop signal GenDrv1 from the control unit 14 to start or stop the generator.

[0048] FIG3 shows a circuit schematic diagram of a generator start-stop unit 22 according to some embodiments of the present disclosure. In some embodiments, as shown in FIG3 , the generator start-stop unit 22 includes a peripheral circuit 221, a second relay 222, and a switch circuit 223. The peripheral circuit 221 is used to receive the power generation start-stop signal GenDrv1. The second relay 222 is connected to the peripheral circuit 221 to operate under the drive of the peripheral circuit 221. The switch circuit 223 is connected to the generator to start or stop the generator under the control of the second relay 222. The power generation start-stop signal GenDrv1 can switch between two different states. In the first state, the power generation start-stop signal GenDrv1 can control the second relay 222 to turn on the switch circuit 223, thereby starting the generator. In the second state, the power generation start-stop signal GenDrv1 can control the second relay 222 to turn off the switch circuit 223, thereby shutting down the generator.

[0049] In some embodiments, as shown in FIG3 , the peripheral circuit 221 includes a diode 2214, a transistor 2213, a first resistor 2211, and a second resistor 2212. The diode 2214 is connected in parallel with the second relay 222. The cathode of the diode 2214 is coupled to a first positive power supply voltage (+12V). The anode of the diode 2214 is connected to the collector of the transistor 2213. The emitter of the transistor 2213 is connected to ground (GND). One end of the first resistor 2211 receives the power generation start / stop signal GenDrv1, and the other end is connected to the base of the transistor 2213. One end of the second resistor 2212 is connected to the base of the transistor 2213, and the other end is connected to the emitter of the transistor 2213. In the first state, the power generation start / stop signal GenDrv1 can control the transistor 2213 to turn on, thereby causing the second relay 222 to turn on the switch circuit 223. The power generation start / stop signal GenDrv1 can control the transistor 2213 to be turned off in the second state, thereby causing the second relay 222 to disconnect the switch circuit 223 .

[0050] Returning to Figures 1 and 2, in some embodiments, the generator module 20 further includes a delay setting unit 21. The delay setting unit 21 is connected to the control unit 14 to provide the control unit 14 with a first delay setting signal NtoRDelay and a second delay setting signal RtoNDelay. The first delay setting signal NtoRDelay is used to set the generator's startup delay time, and the second delay setting signal RtoNDelay is used to set the generator's shutdown delay time. The control unit 14 can perform analog-to-digital conversion (ADC) sampling on the first delay setting signal NtoRDelay and the second delay setting signal RtoNDelay to obtain the generator's startup delay time and shutdown delay time.

[0051] If the power supply status detection unit 15 detects an abnormality in the first power supply, the control unit 14 changes the state of the power generation start / stop signal GenDrv1 after the start delay time, causing the generator start / stop unit 22 to control the generator to start. If the power supply status detection unit 15 detects that the first power supply has returned to normal, the control unit 14 changes the power generation start / stop signal GenDrv1 after the stop delay time, causing the generator start / stop unit 22 to control the generator to stop.

[0052] Figure 4 shows a circuit schematic diagram of the delay setting unit 21 according to some embodiments of the present disclosure. In some embodiments, as shown in Figure 4, the delay setting unit 21 includes a first sliding rheostat 2111, a first capacitor 2121, a second sliding rheostat 2112, and a second capacitor 2122. The first sliding rheostat 2111 has a first terminal coupled to a second positive power supply voltage VCC, a second terminal connected to ground GND, and a sliding terminal connected to the control unit 14 to provide the first delay setting signal NtoRDelay to the control unit 14. The first capacitor 2121 is connected between the sliding terminal of the first sliding rheostat 2111 and ground GND. The second sliding rheostat 2112 has a first terminal coupled to the second positive power supply voltage VCC, a second terminal connected to ground GND, and a sliding terminal connected to the control unit 14 to provide the second delay setting signal RtoNDelay to the control unit 14. The second capacitor 2122 is connected between the sliding terminal of the second sliding rheostat 2112 and ground GND. By sliding the sliding ends of the first sliding resistor 2111 and the second sliding resistor 2112 , the first delay setting signal NtoRDelay and the second delay setting signal RtoNDelay can be conveniently changed.

[0053] As described above, the control unit 14 includes an interface for receiving the indication signal MODE. Figure 5 shows an indication unit 24 connected to this interface. Referring to Figures 2 and 5 , the indication unit 24 can be connected to the control unit 14 to provide the control unit 14 with an indication signal indicating that the generator module 20 is connected to the controller body 10. When the generator module 20 is not connected to the controller body 10, the voltage levels of the interfaces of the control unit 14 for receiving the first delay setting signal NtoRDelay and the second delay setting signal RtoNDelay are floating. In this case, the start delay time and the stop delay time are uncertain for the control unit 14. Therefore, by adding the indication signal MODE to the generator module 20 and using a jumper, the controller body 10 can distinguish whether the generator module 20 is connected by detecting the high and low levels of the indication signal MODE. When the generator module 20 is not connected, the sampling signals of the first delay setting signal NtoRDelay and the second delay setting signal RtoNDelay are not used, thus avoiding the impact of the uncertain delay time of the dual power supply on the use of the dual power supply.

[0054] Returning to FIG. 1 , in some embodiments, the generator module 20 further includes an alarm unit 23. Alarm unit 23 is connected to the control unit 14 and generates an alarm when the power status detection unit 15 detects an abnormality in the first power source or the second power source. Alarm unit 23 can generate an alarm using various conventional methods, such as sound, light, and electricity.

[0055] According to the embodiments of the present disclosure, without connecting the generator module 20 to the controller body 10, the controller body 10 can be used alone in a grid-to-grid dual power connection mode, maintaining grid-to-grid functionality and providing ease of use and low cost. Furthermore, when the dual power connection mode is grid-to-generator, simply connecting the generator module 20 to the controller body 10 enables generator start / stop functions and the additional transfer delay setting function.

[0056] While various embodiments of the present disclosure have been described above, the above descriptions are illustrative, non-exhaustive, and not intended to be limiting of the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is selected to best explain the principles of the embodiments, their practical applications, or technological improvements in the marketplace, or to enable other persons skilled in the art to understand the embodiments disclosed herein.

Claims

1. A dual - power conversion switch, the dual - power conversion switch comprising a controller body (10) and a generator module (20) capable of being connected to the controller body (10), wherein the controller body (10) comprises: A power input unit (11), adapted to be connected to a first power source and a second power source to rectify the power source; A first power conversion unit (12), connected to the power input unit (11) to perform voltage conversion on the output of the power input unit (11); A second power conversion unit (13), connected to the first power conversion unit (12) to perform voltage conversion on the output of the first power conversion unit (12); A power - state detection unit (15), coupled to the first power source and the second power source to detect the operating conditions of the first power source and the second power source; A first relay (16), connected to the first power conversion unit (12) to be powered by the output of the first power conversion unit (12), and connected to the power - state detection unit (15) to convert the operating state of the first relay (16) according to the operating conditions of the first power source and the second power source; A motor (17), connected to the first relay (16) to rotate between a position corresponding to the first power source and a position corresponding to the second power source according to the operating state of the first relay (16); And A control unit (14), connected to the second power conversion unit (13) to be powered by the second power conversion unit (13), and capable of providing a power - generation start - stop signal to the generator module (20) when connected to the generator module (20).

2. The double power supply transfer switch according to claim 1, wherein, The power - state detection unit (15) comprises: A step - down unit (151), adapted to step down the first power source and the second power source; and A voltage detection unit (152), connected to the step - down unit (151) to detect whether an abnormality occurs in the stepped - down voltage.

3. The dual-power conversion switch according to claim 1, wherein, The control unit (14) is not connected to the generator module (20), the first power source is a normal power source and the second power source is a standby power source. Wherein, when the power - state detection unit (15) detects that the first power source is abnormal and the second power source is normal, the motor (17) rotates to the position corresponding to the second power source under the control of the first relay (16), and when the power - state detection unit (15) detects that the first power source resumes normal operation, the motor (17) rotates to the position corresponding to the first power source under the control of the first relay (16).

4. The dual power supply transfer switch according to claim 1, wherein, The generator module (20) is connected to the control unit (14) of the controller body (10), the first power source is a normal power source, and the second power source is a generator. Wherein, when the power state detection unit (15) detects an abnormality of the first power supply, the control unit (14) changes the power generation start / stop signal after the start delay time of the generator to control the start of the generator; and when the output voltage of the second power supply rises to a predetermined voltage, the motor (17) rotates to a position corresponding to the second power supply under the control of the first relay (16), and wherein, when the power state detection unit (15) detects that the first power supply has returned to normal, the motor (17) rotates to a position corresponding to the first power supply under the control of the first relay (16), and the control unit (14) changes the power generation start / stop signal after the stop delay time of the generator to control the stop of the generator.

5. The dual power conversion switch according to claim 4, wherein, The generator module (20) includes: A generator start / stop unit (22), the generator start / stop unit (22) being connected to the control unit (14) and receiving the power generation start / stop signal from the control unit (14) to start or stop the generator.

6. The dual-power conversion switch according to claim 5, wherein, The generator start / stop unit (22) includes: A peripheral circuit (221) for receiving the power generation start / stop signal; A second relay (222) connected to the peripheral circuit (221) to operate under the drive of the peripheral circuit (221); and A switch circuit (223) connected to the generator to start or stop the generator under the control of the second relay (222).

7. The dual-power conversion switch according to claim 6, wherein, The peripheral circuit (221) includes: A diode (2214) connected in parallel with the second relay (222), the cathode of the diode (2214) being coupled to a positive power supply voltage; A triode (2213) whose collector is connected to the anode of the diode (2214) and whose emitter is connected to ground; A first resistor (2211) having one end receiving the power generation start / stop signal and the other end connected to the base of the triode (2213); and A second resistor (2212) having one end connected to the base of the triode (2213) and the other end connected to the emitter of the triode (2213).

8. The dual power supply transfer switch according to claim 5, wherein, The generator module (20) further includes: A delay setting unit (21) connected to the control unit (14) to provide a first delay setting signal and a second delay setting signal to the control unit (14), the first delay setting signal being used to set the start delay time and the second delay setting signal being used to set the stop delay time, wherein, when the power state detection unit (15) detects an abnormality of the first power supply, the control unit (14) changes the power generation start / stop signal after the start delay time to enable the generator start / stop unit (22) to control the start of the generator, and wherein, when the power state detection unit (15) detects that the first power supply has returned to normal, the control unit (14) changes the power generation start / stop The signal causes the generator start / stop unit (22) to control the generator to stop.

9. The dual-power conversion switch according to claim 8, wherein, The delay setting unit (21) includes: A first sliding rheostat (2111) whose first terminal is coupled to the positive power supply voltage, whose second terminal is connected to ground, and whose sliding terminal is connected to the control unit (14) to provide the first delay setting signal to the control unit (14); A first capacitor (2121) connected between the sliding terminal of the first sliding rheostat (2111) and ground; A second sliding rheostat (2112) whose first terminal is coupled to the positive power supply voltage, whose second terminal is connected to ground, and whose sliding terminal is connected to the control unit (14) to provide the second delay setting signal to the control unit (14); and A second capacitor (2122) connected between the sliding terminal of the second sliding rheostat (2112) and ground.

10. The dual-power conversion switch according to claim 1, wherein, The generator module (20) further includes: An indicating unit (24) connected to the control unit (14) to provide an indication signal for indicating that the generator module (20) is connected to the controller body (10) to the control unit (14).

11. The dual power supply transfer switch according to claim 1, wherein, The generator module (20) further includes: An alarm unit (23) connected to the control unit (14) to give an alarm when the power supply state detection unit (15) detects an abnormality in the first power supply or the second power supply.

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