Power supply system with automatic switching switch

Abstract

A power supply system with an automatic switching switch includes two main power switch devices, two backup power switch devices, and a control unit. Each of the main power switch devices includes a first main relay switch and a first switch group. The first switch group includes a first bypass switch, a first half-controlled switch, and a first fully-controlled switch. Each of the backup power switch devices includes a second main relay switch and a second switch group. The second switch group includes a second bypass switch, a second half-controlled switch, and a second fully-controlled switch. The control unit controls the main power switch devices and the backup power switch devices to provide uninterrupted power supply to the load. The present disclosure also provides a control method for a power supply system with an automatic switching switch.

Description

Technical Field

[0001] The invention relates to a power supply system, in particular to a power supply system with an automatic switching switch. Background Art

[0002] Automatic Transfer Switch (ATS) is a power circuit automatic switch that is used to switch between the main power supply and the backup power supply to provide a single power output. When the main power supply is insufficient, interrupted or abnormal, the automatic transfer switch will automatically switch the power supply to the backup power supply and continue to provide uninterrupted stable power supply, so that the device end can obtain the most complete power protection.

[0003] See also Figure 1 The power supply system has a dual power supply circuit structure, and the dual power supply circuit is switched through multiple groups of relays S1_R, S1_R', S2_R, S2_R' to provide uninterrupted normal power supply to a load Load.

[0004] When the main power supply V1 is able to supply power normally, the relay S1_R at the first end of the main power supply side and the relay S1_R' at the second end are in the turned-on state, so that the main power supply V1 supplies power to the load Load. On the contrary, when the main power supply V1 cannot supply power normally, the relay S1_R at the first end of the main power supply side and the relay S1_R' at the second end are in the turned-off state, and at the same time, the relay S2_R at the first end (for example, but not limited to the live wire end) of the backup power supply side and the relay S2_R' at the second end (for example, but not limited to the neutral wire end) are switched to the turned-on state. In this way, when the power supply of the main power supply V1 is insufficient, interrupted or abnormal, the automatic switching switch will automatically switch the power supply to the backup power supply V2, and continue to provide stable power with uninterrupted power supply, so that the device end obtains the most complete power protection.

[0005] However, due to the mechanical structure characteristics of the relay, during the power switching process, the switching time is not fast enough and the relay cannot withstand large instantaneous currents (i.e., poor reliability at high currents). Therefore, in application, a semi-controlled switch is further used, such as, but not limited to, a silicon-controlled rectifier (SCR) as a switch.

[0006] See also Figure 2As shown. Since the silicon-controlled rectifier has the ability to withstand large instantaneous currents and is not limited by the mechanical life of the relay, it can avoid the damage to the relay switch contacts caused by uncontrolled arcs when a large instantaneous current flows through the relay switch during switching. In this case, after multiple switching, the relay switch may fail to open and close, which may lead to the failure of switching between the main power supply V1 and the backup power supply V2 or malfunction. For specific operation applications, please refer to Figure 3 However, in the present disclosure, the voltage interruption is not the only limitation. Whenever the main power supply is abnormal or fails, such as a sudden increase or decrease in voltage, the technical spirit of automatic switching between the main power supply and the backup power supply can be realized.

[0007] Although the use Figure 2 The circuit architecture is used to automatically control the switching of the switch. However, in the process of cutting off the power supply, since the half-controlled switch (such as the silicon-controlled rectifier) ​​has the characteristic of uncontrollable shutdown, that is, the shutdown of the silicon-controlled rectifier cannot be achieved by applying an external control signal, the circuit still needs to be cut off by a relay. Therefore, there are still problems such as the cut-off time is not fast enough and the reliability of large current operation is poor. Summary of the invention

[0008] An object of the present invention is to provide a power supply system with an automatic switching switch to overcome the problems of the prior art.

[0009] Therefore, the power supply system with an automatic switching switch of the present invention is used to provide uninterrupted power supply switching for a load. The power supply system with an automatic switching switch includes two main power switch devices, two backup power switch devices and a control unit. The two main power switch devices are respectively coupled to a first end of a main power supply and a second end of the main power supply, and each of the main power switch devices includes a first main relay switch and a first switch group. The first main relay switch is electrically coupled to a main power supply. The first switch group is electrically coupled between the first main relay switch and the load. The first switch group includes a first bypass switch, a first half-controlled switch and a first full-controlled switch. The first half-controlled switch is coupled in parallel to the first bypass switch. The first full-controlled switch is coupled in parallel to the first half-controlled switch. The two backup power switch devices are respectively coupled to a first end of a backup power supply and a second end of the backup power supply, and each of the backup power switch devices includes a second main relay switch and a second switch group. The second main relay switch is electrically coupled to the backup power supply. The second switch group is electrically coupled between the second main relay switch and the load. The second switch group includes a second bypass switch, a second half-controlled switch and a second full-controlled switch. The second half-controlled switch is coupled in parallel to the second bypass switch. The second full-controlled switch is coupled in parallel to the second half-controlled switch. The control unit controls the main power switch devices and the backup power switch devices so that the load is powered by the main power supply or the backup power supply.

[0010] Another object of the present invention is to provide a power supply system with an automatic switching switch to overcome the problems of the prior art.

[0011] Therefore, the power supply system with an automatic switching switch of the present invention is used to provide uninterrupted power supply switching for a load. The power supply system with an automatic switching switch includes a main power switch device, a backup power switch device and a control unit. The main power switch device includes a first main relay switch and a first switch group. The first main relay switch is electrically coupled to a main power source. The first switch group is electrically coupled between the first main relay switch and the load. The first switch group includes a first bypass switch, a first half-controlled switch and a first full-controlled switch. The first half-controlled switch is coupled in parallel to the first bypass switch. The first full-controlled switch is coupled in parallel to the first half-controlled switch. The backup power switch device includes a second main relay switch and a second switch group. The second main relay switch is electrically coupled to a backup power source. The second switch group is electrically coupled between the second main relay switch and the load. The second switch group includes a second bypass switch, a second half-controlled switch and a second full-controlled switch. The second half-controlled switch is coupled in parallel to the second bypass switch. The second fully controlled switch is coupled in parallel to the second half controlled switch. The control unit controls the main power switch devices and the backup power switch devices so that the load is powered by the main power supply or the backup power supply.

[0012] Yet another object of the present invention is to provide a control method for a power supply system with an automatic switching switch to overcome the problems of the prior art.

[0013] Therefore, the control method of the power supply system with an automatic switching switch of the present invention is used to switch a load to provide uninterrupted power supply. The power supply system with an automatic switching switch includes a main power switch device and a backup power switch device, the main power switch device includes a first main relay switch and a first switch group including a first bypass switch, a first half-controlled switch and a first full-controlled switch; the backup power switch device includes a second main relay switch and a second switch group including a second bypass switch, a second half-controlled switch and a second full-controlled switch. The control method comprises: when a main power supply is normal, first controlling the first main relay switch to be turned on, then controlling the first bypass switch to be turned on, and controlling the first half-controlled switch and the first full-controlled switch to be turned on, so that the main power supply supplies power to the load; when a backup power supply is detected to be normal, controlling the second main relay switch to be turned on; when the main power supply is abnormal, first controlling the first bypass switch to be turned off, then controlling the first main relay switch to be turned off, and then controlling the first full-controlled switch to be turned off, so that the main power supply removes the power supply to the load; and controlling the second bypass switch to be turned on, and controlling the second half-controlled switch and the second full-controlled switch to be turned on, so that the backup power supply supplies power to the load.

[0014] Through the proposed power supply system and control method with automatic switching switch, the insulated gate bipolar transistor or metal oxide semiconductor field effect transistor is used to have the ability to shut down when a large current is flowing, and has a shorter switching time and controllable switching state, so as to achieve more precise circuit on-off switching control, thereby improving the power supply quality and power supply reliability of the power switching. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 : It is a circuit diagram of a power supply system using a relay as an automatic switching switch in the prior art.

[0016] Figure 2 : It is a circuit diagram of a power supply system using relays and silicon-controlled rectifiers as automatic switching switches in the prior art.

[0017] Figure 3 : It is a timing diagram of a power supply system with an automatic switching switch in the prior art during voltage interruption operation.

[0018] Figure 4 : is a circuit diagram of a power supply system with an automatic switching switch according to the present invention.

[0019] Figure 5 : It is a timing diagram of the power supply system with automatic switching switch of the present invention when the main power supply is interrupted.

[0020] Figure 6 :It is a flow chart of the control method of the power supply system with automatic switching switch of the present invention.

[0021] Description of reference numerals:

[0022] V1: Main power supply

[0023] V2: Backup power supply

[0024] 10, 10': Main power switch device

[0025] 20, 20': Backup power switch device

[0026] 30: Control unit

[0027] Load: Load

[0028] L1: First live wire terminal

[0029] N1: First neutral line terminal

[0030] L2: Second live wire terminal

[0031] N2: Second neutral line terminal

[0032] S 1_M, S 1_M ': First main relay switch

[0033] S 1_B , S 1_B ': First bypass switch

[0034] S 1_S , S 1_S ': First half controlled switch

[0035] S 1_Q , S 1_Q ': The first fully controlled switch

[0036] D1, D1': first diode

[0037] S 2_M , S 2_M ': Second main relay switch

[0038] S 2_B , S 2_B ': Second bypass switch

[0039] S 2_S , S 2_S ': Second half controlled switch

[0040] S 2_Q , S 2_Q ': Second full control switch

[0041] D2, D2': The second diode

[0042] Srs1: First main relay control signal

[0043] Srq1: First power switch control signal

[0044] Srp1: First bypass relay control signal

[0045] Srs2: Second main relay control signal

[0046] Srq2: Second power switch control signal

[0047] Srp2: Second bypass relay control signal

[0048] t1~t10: time point

[0049] S10~S40: Steps DETAILED DESCRIPTION

[0050] See also Figure 4As shown. The power supply system with an automatic switching switch of the present invention is used to provide uninterrupted power supply switching for a load Load. The power supply system with an automatic switching switch includes two main power switch devices 10, 10', two backup power switch devices 20, 20' and a control unit 30. The two main power switch devices 10, 10' are respectively coupled to a first end and a second end. The two backup power switch devices 20, 20' are respectively coupled to a first end and a second end. When a main power source V1 and a backup power source V2 of the uninterruptible power supply switching are single-phase AC power sources, the first end of the main power source V1 is a live wire end of the main power source V1, and the second end of the main power source V1 is a neutral wire end of the main power source V1; the first end of the backup power source V2 is a live wire end of the backup power source V2, and the second end of the backup power source V2 is a neutral wire end of the backup power source V2. When the main power supply V1 and the backup power supply V2 are three-phase AC power supplies and are connected in a triangle (Δ) manner, the first end and the second end of the main power supply V1 are any two live wire ends of the main power supply V1; the first end and the second end of the backup power supply V2 are any two live wire ends of the backup power supply V2; when the main power supply V1 and the backup power supply V2 are three-phase AC power supplies and are connected in a star (Y) manner, the first end of the main power supply V1 is a live wire end of the main power supply V1, and the second end of the main power supply V1 is a neutral wire end of the main power supply V1; the first end of the backup power supply V2 is a live wire end of the backup power supply V2, and the second end of the backup power supply V2 is a neutral wire end of the backup power supply V2. For the convenience of explanation, in the present disclosure, the main power supply V1 and the backup power supply V2 are taken as an example of single-phase AC power supplies.

[0051] The main power switch device 10 includes a first main relay switch S 1_M and a first switch group. The first main relay switch S 1_M The first switch group is electrically coupled to the first main relay switch S 1_M The first switch group includes a first bypass switch S 1_B , a first half-controlled switch S 1_S and a first fully controlled switch S 1_Q The first half-controlled switch S 1_S The first bypass switch S is coupled in parallel 1_B The first fully controlled switch S 1_Q The first half-controlled switch S is coupled in parallel 1_S The first switch group further includes a first diode D1 which is serially coupled to the first fully-controlled switch S 1_Q , which is used to protect the first fully controlled switch S 1_Q To prevent reverse current from flowing through the first fully controlled switch S1_Q The first fully controlled switch S is damaged. 1_Q .

[0052] The main power switch device 10' comprises a first main relay switch S 1_M ' and a first switch group. The first main relay switch S 1_M The first switch group is electrically coupled to the first main relay switch S 1_M ' between the load Load. The first switch group includes a first bypass switch S 1_B ', a first half-controlled switch S 1_S ' and a first fully controlled switch S 1_Q '. The first half-controlled switch S 1_S 'The first bypass switch S is coupled in parallel 1_B '. The first fully controlled switch S 1_Q 'The first half-controlled switch S is coupled in parallel 1_S The first switch group further includes a first diode D1', which is serially coupled to the first fully-controlled switch S 1_Q ', which is used to protect the first fully controlled switch S 1_Q ', to prevent reverse current from flowing through the first fully controlled switch S 1_Q ' and damage the first fully controlled switch S 1_Q '.

[0053] The backup power switch device 20 includes a second main relay switch S 2_M and a second switch group. The second main relay switch S 2_M The second switch group is electrically coupled to the second main relay switch S 2_M The second switch group includes a second bypass switch S 2_B , a second half-controlled switch S 2_S and a second full-control switch S 2_Q The second half-controlled switch S 2_S The second bypass switch S is coupled in parallel 2_B The second fully controlled switch S 2_Q The second half-controlled switch S is coupled in parallel 2_S The second switch group further includes a second diode D2 which is serially coupled to the second fully-controlled switch S 2_Q .

[0054] The backup power switch device 20' includes a second main relay switch S 2_M ' and a second switch group. The second main relay switch S 2_MThe second switch group is electrically coupled to the second main relay switch S 2_M ' between the load Load. The second switch group includes a second bypass switch S 2_B ', a second half-controlled switch S 2_S ' and a second fully controlled switch S 2_Q '. The second half-controlled switch S 2_S 'The second bypass switch S is coupled in parallel 2_B '. The second fully controlled switch S 2_Q 'The second half-controlled switch S is coupled in parallel 2_S The second switch group further includes a second diode D2', which is serially coupled to the second fully-controlled switch S 2_Q '.

[0055] The first bypass switch S 1_B , S 1_B ', the second bypass switch S 2_B , S 2_B ' is a relay switch; the first half-controlled switch S 1_S , S 1_S ', the second half-controlled switch S 2_S , S 2_S ' is a silicon controlled rectifier switch; the first fully controlled switch S 1_Q , S 1_Q ', the second fully controlled switch S 2_Q , S 2_Q ' is an insulated gate bipolar transistor (IGBT) switch or a metal oxide semiconductor field effect transistor (MOSFET) switch. However, the present invention is not limited to the above switch types.

[0056] The control unit 30 controls the main power switch device 10, 10' and the backup power switch device 20, 20' so that the load Load is powered by the main power V1 or the backup power V2. The control unit 30 electrically connects the main power switch device 10, 10' and the backup power switch device 20, 20', and generates a plurality of control signals Srs1, Srq1, Srp1, Srs2, Srq2, Srp2 to control the first main relay switch S 1_M , S 1_M ', the first bypass switch S 1_B ,S 1_B ', the first half-controlled switch S 1_S , S 1_S ', the first fully controlled switch S 1_Q , S 1_Q '; and the second main relay switch S 2_M , S2_M ', the second bypass switch S 2_B , S 2_B ', the second half-controlled switch S 2_S , S 2_S 'And the second fully controlled switch S 2_Q , S 2_Q '.

[0057] See also Figure 5 As shown, the power supply process is divided into three parts. In the first power supply process, at time point t1, the main power supply V1 is in a normal power supply state, and the backup power supply V2 may not be ready to supply power. When the main power supply V1 is in a normal power supply state, the control unit 30 provides a high-level first main relay control signal Srs1 to control the first main relay switch S 1_M , S 1_M Then, at time point t3, a high-level first bypass relay control signal Srp1 is provided to control the first bypass switch S 1_B , S 1_B ' is turned on, and at the same time provides a high level first power switch control signal Srq1 to control the first half-controlled switch S 1_S , S 1_S 'With the first fully controlled switch S 1_Q , S 1_Q ' is turned on. Since the first bypass switch S 1_B , S 1_B ' is a mechanical relay, so the first bypass switch S 1_B , S 1_B The conduction time will be longer than that of the first half-controlled switch S 1_S , S 1_S 'With the first fully controlled switch S 1_Q , S 1_Q ' is late, so as to avoid the instantaneous large current flowing through the relay switch (the first bypass switch S 1_B , S 1_B ') and thus damage the relay switch contacts, resulting in the risk of relay switch failure. Thus, the main power source V1 that is normally powered can provide the required power to the load Load.

[0058] In order to enable the backup power source V2 to supply power as soon as possible when the main power source V1 is abnormal, so as to maintain the power supply quality and reliability, before time point t4, once the backup power source V2 is detected to be ready for supplying power, the control unit 30 can provide a high-level second main relay control signal Srs2 to control the second main relay switch S 2_M , S 2_M ' is turned on. In this state, due to the second bypass switch S2_B , S 2_B ', the second half-controlled switch S 2_S , S 2_S 'And the second fully controlled switch S 2_Q , S 2_Q ' has not yet been turned on, so the backup power source V2 is in a ready state to supply power.

[0059] At time point t5, i.e., during the second power supply process, since the main power source V1 is detected to have a voltage drop-out, in order to maintain uninterrupted power supply to the load Load, the abnormal main power source V1 must be removed and the ready backup power source V2 must be put into operation. At time point t6, the control unit 30 provides the first bypass relay control signal Srp1 of a low level to control the first bypass switch S 1_B , S 1_B Then, at time point t7, the first main relay control signal Srs1 of a low level is provided to control the first main relay switch S 1_M , S 1_M Then, at time point t8, the first power switch control signal Srq1 of a low level is provided to control the first fully controlled switch S 1_Q , S 1_Q 'Shut down. Since the first main relay switch S 1_M , S 1_M ' and the first bypass switch S 1_B , S 1_B ' is a mechanical relay, so the actual shut-off order of each switch should be the first bypass switch S 1_B , S 1_B ' First turn off, so that the current flowing through the first switch group in the main power supply V1 loop changes to flow through the first fully controlled switch S 1_Q , S 1_Q '; Then the first fully controlled switch S 1_Q , S 1_Q ' is turned off, causing the circuit between the main power supply V1 and the load Load to be cut off; finally, the first main relay switch S 1_M , S 1_M 'Turn off. Thereby, by switching the first main relay S 1_M , S 1_M ', the first bypass switch S 1_B , S 1_B 'And the first fully controlled switch S 1_Q , S 1_Q 'Shut down, so that the main power supply V1 with voltage failure abnormality is successfully removed.

[0060] As described above, after the main power source V1 is successfully removed, the control unit 30 provides a high-level second bypass relay control signal Srp2 to control the second bypass switch S at time point t9 when the backup power source V2 is ready to supply power. 2_B , S 2_B ' is turned on, and at the same time a high level second power switch control signal Srq2 is provided to control the second half-controlled switch S 2_S , S 2_S 'With the second fully controlled switch S 2_Q , S 2_Q ' is turned on. Since the second bypass switch S 2_B , S 2_B ' is a mechanical relay, so the second bypass switch S 2_B , S 2_B The conduction time will be longer than that of the second half-controlled switch S 2_S , S 2_S 'With the second fully controlled switch S 2_Q , S 2_Q ' is late, so as to avoid the instantaneous large current flowing through the relay switch (the second bypass switch S 2_B , S 2_B ') and thus damage the relay switch contacts, causing the risk of relay switch failure. Thus, the backup source V2 that normally supplies power replaces the main power source V1 to supply power to the load Load, so as to maintain uninterrupted power supply to the load Load.

[0061] Once it is detected that the main power source V1 has resumed normal power supply before time point t10, that is, in the third power supply process, the control unit 30 can also switch the first main relay switch S 1_M , S 1_M ' is turned on, that is, when the first bypass switch S 1_B , S 1_B ', the first half-controlled switch S 1_S , S 1_S 'And the first fully controlled switch S 1_Q , S 1_Q 'Before it is turned on, first switch the first main relay S 1_M , S 1_M ' is turned on, so that the main power source V1 can be in a ready-to-supply state before returning to the dominant power supply state. Similarly, by turning off the second bypass switch S 2_B , S 2_B 'With the second fully controlled switch S 2_Q , S 2_Q ', and turn on the first bypass switch S 1_B , S 1_B ', the first half-controlled switch S1_S , S 1_S 'And the first fully controlled switch S 1_Q , S 1_Q ', so that the main power supply V1 successfully replaces the backup power supply V2 and takes the lead in the power supply task of the load Load again.

[0062] See also Figure 6 As shown. The control method includes the following steps: when the main power supply is normal, first control the first main relay switch to be turned on, then control the first bypass switch to be turned on, and control the first half-controlled switch and the first full-controlled switch to be turned on, so that the main power supply supplies power to the load (S10). When the backup power supply is detected to be normal, control the second main relay switch to be turned on (S20). When the main power supply is abnormal, first control the first bypass switch to be turned off, then control the first main relay switch to be turned off, and then control the first full-controlled switch to be turned off, so that the main power supply removes the power supply to the load (S30). Control the second bypass switch to be turned on, and control the second half-controlled switch and the second full-controlled switch to be turned on, so that the backup power supply supplies power to the load (S40).

[0063] In summary, the present invention has the following features and advantages:

[0064] 1. Silicon controlled rectifiers (SCRs) have the ability to withstand large instantaneous currents and can replace the mechanical life limit of relays. This can prevent the uncontrolled arcing caused by large instantaneous currents flowing through the relay switch when the relay switch is switched, which will cause damage to the relay switch contacts. After multiple switching operations, the relay switch may fail to open or close, resulting in a failure or malfunction of the switching between the main power supply V1 and the backup power supply V2.

[0065] 2. Insulated gate bipolar transistors (IGBTs) or metal oxide semiconductor field effect transistors (MOSFETs) have the ability to shut down when large currents are flowing, that is, they have better ability to cut off large currents, and have shorter switching times and controllable switching states to achieve more precise circuit on-off switching control, thereby improving the power supply quality and reliability of power switching.

Claims

1. A power supply system with an automatic switching switch, the system comprising: Two main power switch devices are respectively coupled to a first terminal and a second terminal of a main power source, each of the main power switch devices comprising: a first main relay switch electrically coupled to the main power source; and A first switch group electrically coupled between the first main relay switch and a load, the first switch group comprising: a first bypass switch; a first half-controlled switch coupled in parallel to the first bypass switch; and a first fully-controlled switch, directly coupled in parallel to the first half-controlled switch; Two backup power switch devices are respectively coupled to a first end and a second end of a backup power source, and each of the backup power switch devices comprises: a second main relay switch electrically coupled to the backup power supply; and a second switch group electrically coupled between the second main relay switch and the load, the second switch group comprising: a second bypass switch; a second half-controlled switch coupled in parallel to the second bypass switch; and a second fully-controlled switch, directly coupled in parallel to the second half-controlled switch; and A control unit controls the two main power switch devices and the two backup power switch devices so that the load is powered by the main power supply or the backup power supply.

2. A power supply system with an automatic switching switch as described in claim 1, wherein the first switch group further includes a first diode, which is coupled in series with the first fully-controlled switch to prevent reverse current from flowing through the first fully-controlled switch; the second switch group further includes a second diode, which is coupled in series with the second fully-controlled switch to prevent reverse current from flowing through the second fully-controlled switch.

3. A power supply system with an automatic switching switch as described in claim 1, wherein when the main power supply and the backup power supply are single-phase AC power supplies, the first end of the main power supply is a live wire end of the main power supply, and the second end of the main power supply is a neutral wire end of the main power supply; the first end of the backup power supply is a live wire end of the backup power supply, and the second end of the backup power supply is a neutral wire end of the backup power supply.

4. A power supply system with an automatic switching switch as described in claim 1, wherein when the main power supply and the backup power supply are three-phase AC power supplies and are connected in a triangle, the first end and the second end of the main power supply are any two live wire ends of the main power supply; the first end and the second end of the backup power supply are any two live wire ends of the backup power supply; when the main power supply and the backup power supply are three-phase AC power supplies and are connected in a star, the first end of the main power supply is a live wire end of the main power supply, and the second end of the main power supply is a neutral wire end of the main power supply; the first end of the backup power supply is a live wire end of the backup power supply, and the second end of the backup power supply is a neutral wire end of the backup power supply.

5. The power supply system with an automatic switching switch as described in claim 1, wherein the first bypass switch and the second bypass switch are relay switches; the first half-controlled switch and the second half-controlled switch are silicon-controlled rectifier switches; the first fully-controlled switch and the second fully-controlled switch are insulated gate bipolar transistor switches or metal oxide semiconductor field effect transistor switches.

6. A power supply system with an automatic switching switch, the system comprising: A main power switch device, comprising: a first main relay switch electrically coupled to a main power source; and A first switch group electrically coupled between the first main relay switch and a load, the first switch group comprising: a first bypass switch; a first half-controlled switch coupled in parallel to the first bypass switch; and a first fully-controlled switch, directly coupled in parallel to the first half-controlled switch; A backup power switch device, comprising: a second main relay switch electrically coupled to a backup power source; and a second switch group electrically coupled between the second main relay switch and the load, the second switch group comprising: a second bypass switch; a second half-controlled switch coupled in parallel to the second bypass switch; and a second fully-controlled switch, directly coupled in parallel to the second half-controlled switch; and A control unit controls the main power switch device and the backup power switch device so that the load is powered by the main power supply or the backup power supply.

7. A power supply system with an automatic switching switch as described in claim 6, wherein the first switch group further includes a first diode, which is coupled in series with the first fully-controlled switch to prevent reverse current from flowing through the first fully-controlled switch; the second switch group further includes a second diode, which is coupled in series with the second fully-controlled switch to prevent reverse current from flowing through the second fully-controlled switch.

8. The power supply system with an automatic switching switch as described in claim 6, wherein the first bypass switch and the second bypass switch are relay switches; the first half-controlled switch and the second half-controlled switch are silicon-controlled rectifier switches; the first fully-controlled switch and the second fully-controlled switch are insulated gate bipolar transistor switches or metal oxide semiconductor field effect transistor switches.

9. A control method for a power supply system with an automatic switching switch according to any one of claims 6 to 8, so as to provide uninterrupted power supply switching for a load; the power supply system with an automatic switching switch comprises a main power switch device and a backup power switch device, the main power switch device comprises a first main relay switch and a first switch group having a first bypass switch, a first half-controlled switch and a first fully-controlled switch; the backup power switch device comprises a second main relay switch and a second switch group having a second bypass switch, a second half-controlled switch and a second fully-controlled switch; the control method comprises: When a main power source is normal, the first main relay switch is first controlled to be turned on, and then the first bypass switch is controlled to be turned on, and the first half-controlled switch and the first full-controlled switch are controlled to be turned on, so that the main power source supplies power to the load; When a backup power supply is detected to be normal, the second main relay switch is controlled to be turned on; When the main power source is abnormal, firstly the first bypass switch is controlled to be turned off, then the first main relay switch is controlled to be turned off, and then the first full-control switch is controlled to be turned off, so that the main power source removes the power supply to the load; and The second bypass switch is controlled to be turned on, and the second half-controlled switch and the second full-controlled switch are controlled to be turned on, so that the backup power supply supplies power to the load.

10. A control method for a power supply system with an automatic switching switch as described in claim 9, wherein the first switch group further includes a first diode, which is coupled in series with the first fully-controlled switch to prevent reverse current from flowing through the first fully-controlled switch; the second switch group further includes a second diode, which is coupled in series with the second fully-controlled switch to prevent reverse current from flowing through the second fully-controlled switch.

11. A control method for a power supply system with an automatic switching switch as described in claim 9, wherein the first bypass switch and the second bypass switch are relay switches; the first half-controlled switch and the second half-controlled switch are silicon-controlled rectifier switches; the first fully-controlled switch and the second fully-controlled switch are insulated gate bipolar transistor switches or metal oxide semiconductor field effect transistor switches.

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