TW202136964A - Powre supply system with automatic transfer switches - Google Patents

Abstract

A power supply system with automatic transfer switches includes two main power switch apparatuses, two backup power switch apparatuses, and a control unit. Each main power switch apparatus includes a first main relay switch and a first switch assembly. The first switch assembly includes a first bypass switch, a first semi-controllable switch, and a first fully-controllable switch. Each backup power switch apparatus includes a second main relay switch and a second switch assembly. The second switch assembly includes a second by pass switch, a second semi-controllable switch, and a second fully-controllable switch. The control unit controls the two main power switch apparatuses and the two backup power switch apparatuses to uninterruptedly supply power to a load.

Description

Power supply system with automatic switch

The present invention relates to a power supply system, especially a power supply system with an automatic switch.

The Automatic Transfer Switch (ATS) is an automatic transfer switch of the power circuit, which is used to switch between the main power supply and the backup power supply, so as to provide a single power output. When the main power supply power is insufficient, interrupted or abnormal, the automatic switch will automatically switch the power supply to the backup power supply, continue to provide uninterrupted power supply and stable power, so that the equipment side can obtain the most complete power protection.

Please refer to Figure 1. The power supply system has a dual power supply loop structure, and through multiple sets of relays S1_R, S1_R', S2_R, S2_R' to switch the dual power loops to provide uninterrupted normal power supply to a load.

When the main power supply V1 can 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 turned-on, so that the main power supply V1 supplies power to the load Load. Conversely, 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 first end ( For example, but not limited to the relay S2_R of the live terminal and the relay S2_R' of the second terminal (for example, but not limited to the neutral terminal) are in a turned-on state. In this way, when the power supply of the main power supply V1 is insufficient, interrupted or abnormal, the automatic switch will automatically switch the power supply to the backup power supply V2 to continue to provide stable power for uninterrupted power supply, so that the equipment side can obtain the most complete power protection.

However, limited by the mechanical structure characteristics of the relay, during the process of power switching, the switching time is not fast enough, and the problem that it cannot withstand large instantaneous currents (that is, the reliability at large currents is poor), therefore, in the application , And further will be used with a semi-controllable switch, for example, but not limited to silicon controlled rectifier (SCR) as a switch.

Please refer to Figure 2. Because the silicon controlled rectifier has the ability to withstand large instantaneous currents, and does not have the mechanical life limit of the relay, it can prevent the relay switch from being switched, if there is an instantaneous large current flowing through the relay switch, it is not controlled The arc generated under the voltage may damage the relay switch contacts; and in this case, after multiple switching and use, it may cause the relay switch to fail to open and close, and then cause the main power supply V1 and the backup power supply V2 to fail to switch Or misoperation happened. See Figure 3 for specific operating applications. However, in this case, not only the voltage interruption is the limit, but the main power source is abnormal or fails, such as voltage swells, sags, etc., to achieve the technical spirit of automatic switching between the main power supply and the backup power supply.

Although the circuit architecture shown in Figure 2 is used for the switching control of the automatic switch, however, in the process of cutting off the power, the semi-controlled switch (such as silicon controlled rectifier) has the characteristic of turning off uncontrollable, that is, the turning off of the silicon controlled rectifier. The disconnection cannot be achieved by applying an external control signal, so the disconnection of the circuit still needs to be performed by a relay. Therefore, there are still problems that the disconnection time is not fast enough and the reliability of large current operation is not good.

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

Therefore, the power supply system with automatic switch of the present invention can provide uninterrupted power supply to a load. The power supply system with automatic switch includes two main power switch devices, two standby power switch devices, and a control unit. The two main power switch devices are respectively coupled to a first end of a main power source and a second end of the main power source. 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 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-control switch, and a first full-control switch. The first half-controlled switch is coupled to the first bypass switch in parallel. The first full control switch is coupled in parallel to the first half control switch. The two standby power switch devices are respectively coupled to a first end of a standby power source and a second end of the standby power source. Each of the standby 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 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 to the second bypass switch in parallel. The second full control switch is coupled in parallel to the second half control 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 source or the backup power source.

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

Therefore, the power supply system with automatic switch of the present invention can provide uninterrupted power supply to a load. The power supply system with automatic 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-control switch, and a first full-control switch. The first half-controlled switch is coupled to the first bypass switch in parallel. The first full control switch is coupled in parallel to the first half control switch. The standby 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 to the second bypass switch in parallel. The second full control switch is coupled in parallel to the second half control 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 source or the backup power source.

Another object of the present invention is to provide a control method of a power supply system with an automatic switch to overcome the problems of the prior art.

Therefore, the control method of the power supply system with automatic switch of the present invention can provide uninterrupted power supply to a load. A power supply system with an automatic 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 bypass switch, a first half-controlled switch, and A first switch group of a first full control switch; the backup power switch device includes a second main relay switch and a second bypass switch, a second half control switch, and a second full control switch A second switch group. The control method includes: when a main power source is normal, first controlling the first main relay switch to conduct, then controlling the first bypass switch to conduct, and controlling the first half-controlled switch and the first fully-controlled switch to conduct , So that the main power supply supplies power to the load; when it is detected that a backup power supply is normal, the second main relay switch is controlled to be turned on; when the main power supply is abnormal, the first bypass switch is first controlled to turn off, and then the first bypass switch is controlled to be turned off. A main relay switch is turned off, and then the first full control switch is controlled to be turned off, so that the main power source is removed to supply power to the load; and the second bypass switch is controlled to be turned on, and the second half-controlled switch is controlled to The second full-control switch is turned on, so that the standby power supply supplies power to the load.

With the proposed power supply system and control method with automatic switch, the use of insulated gate bipolar transistors or metal oxide semiconductor field-effect transistors has the ability to be turned off under the condition of large current flow, and has more Short switching time, can control the switching state, and achieve more accurate circuit on-off switching control, which can improve the power supply quality and power supply reliability of power switching.

Please refer to Figure 4. The power supply system with automatic switch of the present invention is used to provide uninterrupted power supply to a load. The power supply system with automatic 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 standby power switch devices 20, 20' are respectively coupled to a first end and a second end. When one of the main power sources V1 and a backup power source V2 of the uninterrupted power supply switch are single-phase AC power sources, the first end of the main power source V1 is a live terminal of the main power source V1, and the second end of the main power source V1 Terminal is a neutral terminal of the main power supply V1; the first terminal of the backup power supply V2 is a live terminal of the backup power supply V2, and the second terminal of the backup power supply V2 is a neutral terminal of the backup power supply V2 Line end. When the main power source V1 and the backup power source V2 are three-phase AC power sources and are delta (Δ) connection, the first end and the second end of the main power source V1 are any two live wires of the main power source V1 Terminal; the first terminal and the second terminal of the backup power supply V2 are any two live wire terminals 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 star (Y ) When connected, the first terminal of the main power supply V1 is a live terminal of the main power supply V1, and the second terminal of the main power supply V1 is a neutral terminal of the main power supply V1; The first terminal is a live terminal of the backup power supply V2, and the second terminal of the backup power supply V2 is a neutral terminal of the backup power supply V2. For the convenience of description, in this case, the main power supply V1 and the backup power supply V2 are single-phase AC power supplies as an example.

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 is} electrically coupled to the first live terminal L1 of the main power supply V1. The first switch group is electrically coupled between the first main relay switch S _{1_M} and 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 coupled in parallel to the first bypass switch _S 1_B. The first fully-controlled switch S _{1_Q is} coupled in parallel to the first half-controlled switch S _{1_S} . The first switch group further includes a first diode D1, which is coupled in series to the first fully controlled switch S _{1_Q} , and is used to protect the first fully controlled switch S _{1_Q} to prevent reverse current flow The first full control switch S _{1_Q} is damaged by the first full control switch S _{1_Q} .

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} ′ is electrically coupled to the first neutral terminal N1 of the main power supply V1. The first switch group is electrically coupled between the first main relay switch S _{1_M} ′ and 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 full-controlled switch S _{1_Q} ′. The first half-controlled switch _S 1_S 'coupled in parallel to the first bypass switch _S 1_B'. The first fully-controlled switch S _{1_Q} ′ is coupled in parallel to the first half-controlled switch S _{1_S} ′. The first switch group further includes a first diode D1', which is coupled in series to the first fully-controlled switch S _{1_Q} ', and is used to protect the first fully-controlled switch S _{1_Q} ' to prevent The reverse current flows through the first fully-controlled switch S _{1_Q} ′ and damages the first fully-controlled switch S _{1_Q} ′.

The standby 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 is} electrically coupled to the second live terminal L2 of the backup power source V2. The second switch group is electrically coupled between the second main relay switch S _{2_M} and 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 full-controlled switch S _{2_Q} . The second half-controlled switch S _{2_S is} coupled to the second bypass switch S _{2_B in parallel} . The second fully-controlled switch S _{2_Q is} coupled in parallel to the second half-controlled switch S _{2_S} . The second switch group further includes a second diode D2, which is coupled in series to the second fully-controlled switch S _{2_Q} .

The standby 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} ′ is electrically coupled to the second neutral terminal N2 of the backup power source V2. The second switch group is electrically coupled between the second main relay switch S _{2_M} ′ and the load Load. The second switch group includes a second bypass switch S _{2_B} ′, a second half control switch S _{2_S} ′, and a second full control switch S _{2_Q} ′. The second half-controlled switch S _{2_S} ′ is coupled to the second bypass switch S _{2_B} ′ in parallel. The second fully-controlled switch S _{2_Q} ′ is coupled in parallel to the second half-controlled switch S _{2_S} ′. The second switch group further includes a second diode D2', which is coupled in series to the second fully-controlled switch S _{2_Q} '.

The first bypass switch _S 1_B, S 1_B ', the second bypass switch _S 2_B, S 2_B' relay-based switch; the first half-controlled switch _S 1_S, S 1_S ', the second half-controlled formula The switches S _{2_S} and S _{2_S} 'are silicon controlled rectifier switches; the first fully controlled switch S _{1_Q} , S _{1_Q} ' and the second fully controlled switch S _{2_Q} , S _{2_Q} 'are insulated gate bipolar transistors (IGBT ) Switch or metal oxide semiconductor field effect transistor (MOSFET) switch. However, the present invention is not limited to the above-mentioned switch types.

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 supply V1 or the backup power supply V2. The control unit 30 is electrically connected to 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 second a 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 ', full control of the first switch _S 1_Q, S 1_Q '; and the second main relay switch S _{2_M} , S _{2_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 full-controlled switch S _{2_Q} ,S _{2_Q} '.

As shown in Figure 5, the power supply process is divided into three parts. In the first power supply process, the main power supply V1 is in a normal power supply state at time t1, and the backup power supply V2 may not be ready for power supply at this time. When the main power supply V1 is normally powered, the control unit 30 provides a high-level first main relay control signal Srs1 at the time point t2 to control the first main relay switches S _{1_M} and S _{1_M} 'to be turned on. Then, at the time point t3, the first bypass relay control signal Srp1 providing the high level controls the first bypass switch S _{1_B} and S _{1_B} ' to conduct, and at the same time, the first power switch control signal Srq1 providing the high level is controlled. The first half-controlled switch S _{1_S} , S _{1_S} ′ and the first full-controlled switch S _{1_Q} , S _{1_Q} ′ are conductive. Since the first bypass switch _S 1_B, S 1_B 'is a mechanical relay, so that the first bypass switch _S 1_B, S 1_B' conduction time, the first half will be more controlled switch _S 1_S, S 1_S 'and The first full-control switch S _{1_Q} , S _{1_Q} 'is late, so that it can avoid the instantaneous large current flowing through the relay switch (the first bypass switch S _{1_B} , S _{1_B} ') and causing damage to the relay switch contact. It may cause the failure of opening and closing of the relay switch. In this way, the main power supply V1 that is normally powered can provide the required power to the load Load.

In order to enable the backup power supply V2 to supply power as soon as the main power supply V1 is abnormal, so as to maintain the power supply quality and reliability, therefore, before the time point t4, it is detected that the backup power supply V2 is ready When the power supply is available, the control unit 30 can provide a high-level second main relay control signal Srs2 to control the second main relay switches S _{2_M} and S _{2_M} ' to be turned on at the time point t4. In this state, since the second bypass switch S _{2_B} , S _{2_B} ', the second half-controlled switch S _{2_S} , S _{2_S} ', and the second full-controlled switch S _{2_Q} , S _{2_Q} 'are not turned on yet, , The backup power supply V2 is in a state of being ready for power supply.

At time t5, that is, during the second power supply process, since the main power supply V1 is detected to have a voltage drop-out abnormality, in order to maintain uninterrupted power supply to the load Load, an abnormality must occur The main power source V1 is removed, and the standby power source V2 that is ready for power supply is put in. At time t6, the control unit 30 provides the first bypass relay control signal Srp1 with a low level to control the first bypass switches S _{1_B} and S _{1_B} ' to turn off. Then, at time t7, the first main relay control signal Srs1 providing a low level controls the first main relay switch S _{1_M} and S _{1_M} 'to turn off. Then, at time t8, the first power switch control signal Srq1 providing a low level controls the first fully-controlled switch S _{1_Q} and S _{1_Q} ′ to turn off. 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, and therefore each of the switching off sequence should be for the actual first bypass switch _S 1_B, S _{1_B'Turn} off first, so that the current flowing through the first switch group on the main power supply V1 loop is changed to flow through the first full control switch S _{1_Q} , S _{1_Q} '; then the first full control 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} ' is turned off. Whereby, through the first main relay switch _S 1_M, S 1_M ', the first bypass switch _S 1_B, S 1_B' and the first full-controlled switch _S 1_Q, S 1_Q 'off, the voltage that occurs The abnormally failed main power supply V1 is successfully removed.

As mentioned above, after the main power supply V1 is successfully removed, the control unit 30 provides a high-level second bypass relay control signal Srp2 at time t9 when the backup power supply V2 is ready for power supply to control the The second bypass switches S _{2_B} , S _{2_B} 'are 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} ' and the second fully-controlled switch S _{2_Q} ,S _{2_Q'turn} on. Since the second bypass switches S _{2_B} and S _{2_B} 'are mechanical relays, the _{conduction time of the second bypass switches S 2_B} and S _{2_B} ' will be longer than that of the second half-controlled switches S _{2_S} , S _{2_S} 'and The second full-control switch S _{2_Q} , S _{2_Q} 'is late, so it can avoid the instantaneous high current first flowing through the relay switch (the second bypass switch S _{2_B} , S _{2_B} ') and causing damage to the relay switch contact. It may cause the failure of opening and closing of the relay switch. In this way, the backup source V2, which is normally powered, replaces the main power source V1 to supply power to the load Load, so as to maintain uninterrupted power supply to the load Load.

Once it is detected that the main power supply V1 has resumed normal power supply before the time point t10, that is, in the third power supply process, the control unit 30 can also switch the first main relay S _{1_M} and S _{1_M at the time point t10.} 'is turned on, _i.e., S 1_B the first bypass switch _S 1_B', the first half-controlled switch _S 1_S, S 1_S 'and the first full-controlled switch _S 1_Q, S 1_Q' has not been turned on before the first _{Turning on} the first main relay switch S 1_M and S _{1_M} 'can make the main power supply V1 be in a state ready for power supply before returning to the state of leading power supply. Similarly, again by turning off the second bypass switch _S 2_B, S 2_B 'to the second full-controlled switch _S 2_Q, S 2_Q', and turning on 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} ′ enable the main power supply V1 to successfully replace the backup power supply V2 and re-lead the power supply task for the load Load .

Please refer to Figure 6. The control method includes the following steps: when the main power supply is normal, first control the first main relay switch to conduct, then control the first bypass switch to conduct, and control the first half-control switch and the first full-control switch to conduct, so that the main The power supply supplies power to the load (S10). When it is detected that the backup power source is normal, the second main relay switch is controlled to be turned on (S20). When the main power supply is abnormal, first control the first bypass switch to turn off, then control the first main relay switch to turn off, and then control the first full control switch to turn off, so that the main power supply is removed to supply power to the load (S30). The second bypass switch is controlled to be turned on, and the second half-controlled switch and the second fully-controlled switch are controlled to be turned on, so that the backup power supply supplies power to the load (S40).

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

1. Silicon-controlled rectifiers (SCR) have the ability to withstand large instantaneous currents, which can replace relays with mechanical life limitations, and can prevent relay switches from being switched, if instantaneous large currents flow through the relay switches, The arc generated under the voltage will cause damage to the relay switch contacts, and will cause the relay switch to fail after being switched for many times, and cause the main power supply V1 and the backup power supply V2 to fail to switch or act. happen.

2. Insulated Gate Bipolar Transistor (IGBT) or Metal Oxide Semiconductor Field Effect Transistor (MOSFET) has the ability to be turned off when a large current flows, that is, it has a better ability to cut off large currents, and It has a shorter switching time, can control the switching state, and achieve more accurate circuit on-off switching control, so it can improve the power supply quality and power supply reliability of power switching.

V1: main power supply

V2: Standby power supply

10,10’: Main power switch device

20, 20’: Standby power switch device

30: control unit

Load: load

L1: The first live terminal

N1: The first neutral terminal

L2: The second live wire end

N2: second neutral terminal

S _{1_M} ,S _{1_M} ': the first main relay switch

S _{1_B} ,S _{1_B} ': the first bypass switch

S _{1_S} ,S _{1_S} ': the first half-controlled switch

S _{1_Q} ,S _{1_Q} ': the first full control switch

D1, D1’: The first diode

S _{2_M} ,S _{2_M} ': the second main relay switch

S _{2_B} ,S _{2_B} ': the second bypass switch

S _{2_S} ,S _{2_S} ': the second half-controlled switch

S _{2_Q} ,S _{2_Q} ': the second full control switch

D2, D2’: the second diode

Srs1: The first main relay control signal

Srq1: The first power switch control signal

Srp1: The first bypass relay control signal

Srs2: The second main relay control signal

Srq2: The second power switch control signal

Srp2: The second bypass relay control signal

t1~t10: time point

S10~S40: steps

Figure 1: A circuit diagram of a power supply system using a relay as an automatic switch in the prior art.

Figure 2: A circuit diagram of a power supply system using a relay and a silicon controlled rectifier as an automatic switch in the prior art.

Figure 3: A timing diagram of a prior art power supply system with an automatic switch during a voltage interruption operation.

Figure 4: is a schematic circuit diagram of a power supply system with an automatic switch of the present invention.

Figure 5: is a schematic diagram of the timing sequence of the power supply system with automatic switch of the present invention when the main power supply is interrupted.

Fig. 6 is a flow chart of the control method of the power supply system with automatic switch of the present invention.

V1: main power supply

V2: Standby power supply

10,10’: Main power switch device

20, 20’: Standby power switch device

30: control unit

Load: load

L1: The first live terminal

N1: The first neutral terminal

L2: The second live wire end

N2: second neutral terminal

S _{1_M} ,S _{1_M} ': the first main relay switch

S _{1_B} ,S _{1_B} ': the first bypass switch

S _{1_S} ,S _{1_S} ': the first half-controlled switch

S _{1_Q} ,S _{1_Q} ': the first full control switch

D1, D1’: The first diode

S _{2_M} ,S _{2_M} ': the second main relay switch

S _{2_B} ,S _{2_B} ': the second bypass switch

S _{2_S} ,S _{2_S} ': the second half-controlled switch

S _{2_Q} ,S _{2_Q} ': the second full control switch

D2, D2’: the second diode

Srs1: The first main relay control signal

Srq1: The first power switch control signal

Srp1: The first bypass relay control signal

Srs2: The second main relay control signal

Srq2: The second power switch control signal

Srp2: The second bypass relay control signal

t1~t10: time point

Claims (11)

A power supply system with automatic switch, the system includes: Two main power switch devices are respectively coupled to a first end and a second end of a main power source, and each of the main power switch devices includes: A first main relay switch electrically coupled to the main power supply; and A first switch group is electrically coupled between the first main relay switch and a load, and the first switch group includes: A first bypass switch; A first half-controlled switch coupled in parallel to the first bypass switch; and A first full control switch, coupled in parallel to the first half control switch; Two standby power switch devices are respectively coupled to a first end and a second end of a standby power source. Each standby power switch device includes: A second main relay switch electrically coupled to the backup power source; and A second switch group is electrically coupled between the second main relay switch and the load, and the second switch group includes: A second bypass switch; A second half-controlled switch coupled in parallel to the second bypass switch; and A second fully-controlled switch coupled in parallel to the second half-controlled switch; and A control unit controls the main power switch devices and the backup power switch devices so that the load is powered by the main power source or the backup power source. The power supply system with automatic switch as described in claim 1, wherein the first switch group further includes a first diode, and the first diode is coupled in series to the first full control switch to prevent A reverse current flows through the first fully-controlled switch; the second switch group further includes a second diode, and the second diode is coupled in series to the second fully-controlled switch to prevent reverse current from flowing through the The second full control switch. The power supply system with an automatic switch as described in claim 1, wherein when the main power supply and the standby power supply are single-phase AC power supplies, the first end of the main power supply is a live terminal of the main power supply, and the The second terminal of the main power supply is a neutral terminal of the main power supply; the first terminal of the backup power supply is a live terminal of the backup power supply; the second terminal of the backup power supply is one of the backup power supplies Sexual end. The power supply system with an automatic 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 delta connection, the first end and the second end of the main power supply The terminals are any two live terminals of the main power source; the first terminal and the second terminal of the standby power source are any two live terminals of the standby power source; when the main power source and the standby power source are three-phase AC power sources, And in the case of star connection, the first terminal of the main power supply is a live terminal of the main power supply, the second terminal of the main power supply is a neutral terminal of the main power supply; the second terminal of the standby power supply One end is a live terminal of the standby power source, and the second terminal of the standby power source is a neutral terminal of the standby power source. The power supply system with automatic 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 switch; 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. A power supply system with automatic switch, the system includes: A main power switch device, including: A first main relay switch electrically coupled to a main power source; and A first switch group is electrically coupled between the first main relay switch and a load, and the first switch group includes: A first bypass switch; A first half-controlled switch coupled in parallel to the first bypass switch; and A first full control switch, coupled in parallel to the first half control switch; A standby power switch device, including: A second main relay switch electrically coupled to a backup power source; and A second switch group is electrically coupled between the second main relay switch and the load, and the second switch group includes: A second bypass switch; A second half-controlled switch coupled in parallel to the second bypass switch; and A second fully-controlled switch 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 source or the backup power source. The power supply system with automatic switching switch according to claim 6, wherein the first switch group further includes a first diode, and the first diode is coupled in series to the first full control switch to prevent A reverse current flows through the first fully-controlled switch; the second switch group further includes a second diode, and the second diode is coupled in series to the second fully-controlled switch to prevent reverse current from flowing through the The second full control switch. The power supply system with an automatic switch as described in claim 6, wherein the first bypass switch and the second bypass switch are relay switches; the first semi-controlled switch and the second semi-controlled switch are Silicon controlled rectifier switch; 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. A control method of a power supply system with an automatic switch to provide uninterrupted power supply to a load; the power supply system with an automatic switch includes a main power switch device and a backup power switch device, the main power switch The device includes a first main relay switch and a first switch group having a first bypass switch, a first half-control switch, and a first full-control switch; the standby power switch device includes a second main relay Switch and a second switch group having a second bypass switch, a second half-controlled switch, and a second full-controlled switch; the control method includes: When a main power supply is normal, first control the first main relay switch to conduct, then control the first bypass switch to conduct, and control the conduction of the first half-control switch and the first full-control switch to make the main power supply Supply power to the load; When detecting that a backup power source is normal, control the second main relay switch to conduct; When the main power supply is abnormal, first control the first bypass switch to turn off, then control the first main relay switch to turn off, and then control the first full control switch to turn off, so that the main power supply removes the load. Power supply; and The second bypass switch is controlled to be turned on, and the second half-controlled switch and the second fully-controlled switch are controlled to be turned on, so that the standby power supply supplies power to the load. The control method for a power supply system with an automatic switch as described in claim 9, wherein the first switch group further includes a first diode, and the first diode is coupled in series to 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, the second diode is coupled in series to the second fully controlled switch to prevent reverse current Flow through the second full control switch. The control method of a power supply system with an automatic 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 relay switches. The type switch is a silicon controlled rectifier switch; 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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