Auxiliary power supply control circuit and auxiliary power supply control device

Abstract

The utility model provides an auxiliary power supply control circuit and an auxiliary power supply control device, and relates to the technical field of control circuits, the auxiliary power supply control circuit comprises a first control circuit, a second control circuit and a switching control circuit; wherein the first control circuit comprises a first transformer and a first contactor; the second control circuit comprises a second transformer and a second contactor; the switching control circuit comprises an interconnection switch and a third contactor; switching of the first control circuit and the second control circuit is achieved through the first contactor and the second contactor, the first control circuit and the second control circuit are standby power supply circuits through the interconnection switch and the third contactor, and therefore the reliability that the auxiliary power supply control circuit supplies power to auxiliary equipment is provided.

Description

Technical Field

[0001] The present application relates to the technical field of control circuits, and in particular to an auxiliary power supply control circuit and an auxiliary power supply control device. Background Art

[0002] In many industrial sectors such as chemical industry, metallurgy, and papermaking, AC690V power distribution systems are often used. To ensure the reliability of power supply, a "two-input and one-connection" power supply method is usually adopted. Due to the influence of voltage level, the auxiliary control power supply often cannot be directly taken from the main distribution circuit. Usually, an isolation transformer is used to reduce the AC690V voltage to AC220V, which is used as an auxiliary control power supply. The existing control power supply device uses a large-capacity intermediate relay to automatically switch between two power supplies. However, since the intermediate relay is easily damaged, once the intermediate relay fails, all control power supplies are affected; and the contact capacity of the intermediate relay is limited, with a maximum capacity of 10A / AC220V. If there are many control devices, the capacity cannot be guaranteed, and the intermediate relay is prone to burn out due to overload, thus failing to ensure power supply reliability. Utility Model Content

[0003] The problem to be solved by the present application is to realize switching of the first control circuit and the second control circuit through the first contactor and the second contactor, and to make the first control circuit and the second control circuit serve as backup power supply circuits for each other through the connecting switch, so as to supply power to the auxiliary equipment through the auxiliary power supply control circuit.

[0004] To solve the above problems, the technical solutions adopted in the embodiments of the present application are as follows:

[0005] In a first aspect, an embodiment of the present application provides an auxiliary power supply control circuit, the auxiliary power supply control circuit comprising: a first control circuit, a second control circuit and a switching control circuit; wherein the first control circuit comprises: a first transformer and a first contactor; the second control circuit comprises: a second transformer and a second contactor; the switching control circuit comprises: a tie switch and a third contactor;

[0006] The two high-voltage inlet terminals of the first transformer are connected to the first group of high-voltage inlet terminals of the main power distribution circuit, the two low-voltage output terminals of the first transformer are respectively connected to the two connection points of the coil of the first contactor, and the two low-voltage output terminals of the first transformer are also respectively connected to the first live wire output terminal and the first neutral wire output terminal through the first group of main contacts and the second group of main contacts of the first contactor; the first live wire output terminal and the first neutral wire output terminal are the first group of output terminals for connecting the first auxiliary equipment;

[0007] The two high-voltage inlet terminals of the second transformer are connected to the second group of high-voltage inlet terminals of the main power distribution circuit, the two low-voltage output terminals of the second transformer are respectively connected to the two connection points of the coil of the second contactor, and the two low-voltage output terminals of the second transformer are also respectively connected to the second live wire output terminal and the second neutral wire output terminal through the first group of main contacts and the second group of main contacts of the second contactor; the second live wire output terminal and the second neutral wire output terminal are the second group of output terminals for connecting the second auxiliary equipment;

[0008] The first live wire output terminal is connected to the second live wire output terminal through a first switch unit, the first neutral wire output terminal is connected to the second neutral wire output terminal through a second switch unit, and the first wiring point is connected to the second wiring point through the tie switch, wherein the first wiring point is a connection point between the first live wire output terminal and the second live wire output terminal, the second wiring point is a connection point between the first neutral wire output terminal and the second neutral wire output terminal, and the first wiring point and the second wiring point are respectively used to connect a control unit of the tie switch;

[0009] The first live wire output terminal is connected to the second live wire output terminal through the first group of main contacts of the third contactor, and the first neutral wire output terminal is connected to the second neutral wire output terminal through the second group of main contacts of the third contactor; the first wiring point is connected to the coil of the third contactor and connected to the second wiring point through the connecting switch.

[0010] In an optional implementation, the tie switch is connected to the coil of the third contactor through an auxiliary contact of the first contactor and an auxiliary contact of the second contactor respectively.

[0011] In an optional embodiment, the auxiliary power supply control circuit further includes: a relay; the third group of main contacts of the first contactor is connected to the first neutral line output terminal through the coil of the relay; the first switch unit includes: a first group of normally open contacts and a first group of normally closed contacts of the relay; the second switch unit includes: a second group of normally open contacts and a second group of normally closed contacts of the relay;

[0012] The first live wire output terminal is connected to the second live wire output terminal through the first group of normally open contacts and the first group of normally closed contacts of the relay in sequence, and the first neutral wire output terminal is connected to the second neutral wire output terminal through the second group of normally open contacts and the second group of normally closed contacts of the relay in sequence.

[0013] In an optional embodiment, the first control circuit further includes: a first circuit breaker, and two low-voltage output terminals of the first transformer are respectively connected to a first group of main contacts and a second group of main contacts of the first contactor through two groups of main contacts of the first circuit breaker.

[0014] In an optional embodiment, the first control circuit further includes: a first fuse, and one of the two high-voltage incoming line terminals of the first transformer is connected to a first group of high-voltage incoming line terminals of a main distribution circuit through the first fuse.

[0015] In an optional embodiment, the first control circuit further includes: a second fuse, and the other high-voltage incoming line terminal of the two high-voltage incoming line terminals of the first transformer is connected to the first group of high-voltage incoming line terminals of the main distribution circuit through the second fuse.

[0016] In an optional embodiment, the second control circuit further includes: a second circuit breaker, and the two low-voltage output ends of the second transformer are respectively connected to the first group of main contacts and the second group of main contacts of the second contactor through two groups of main contacts of the second circuit breaker.

[0017] In an optional embodiment, the second control circuit further includes: a third fuse, and one of the two high-voltage incoming line terminals of the second transformer is connected to the second group of high-voltage incoming line terminals of the main distribution circuit through the third fuse.

[0018] In an optional embodiment, the second control circuit further includes: a fourth fuse, and the other high-voltage incoming line terminal of the two high-voltage incoming line terminals of the second transformer is connected to the second group of high-voltage incoming line terminals of the main distribution circuit through the fourth fuse.

[0019] In the second aspect, an embodiment of the present application further provides an auxiliary power supply control device, comprising: an auxiliary power supply control circuit, a first auxiliary device, a second auxiliary device and a control unit, wherein the high-voltage incoming line terminals of the first transformer and the second transformer in the auxiliary power supply control circuit are respectively used to connect the first group of high-voltage incoming line terminals and the second group of high-voltage incoming line terminals of the main distribution circuit; the connecting switch in the auxiliary power supply control circuit is connected to the control unit, the first group of output terminals and the second group of output terminals in the auxiliary power supply control circuit are respectively connected to the power supply terminals of the first auxiliary device and the second auxiliary device, and the auxiliary power supply control circuit is any one of the auxiliary power supply control circuits described in the first aspect above.

[0020] The beneficial effects of this application are:

[0021] An embodiment of the present application provides an auxiliary power supply control circuit and an auxiliary power supply control device, wherein the auxiliary power supply control circuit includes: a first control circuit, a second control circuit and a switching control circuit; wherein the first control circuit includes: a first transformer and a first contactor; the second control circuit includes: a second transformer and a second contactor; the switching control circuit includes: a connecting switch and a third contactor; the first control circuit and the second control circuit are switched on and off by the first contactor and the second contactor, and the first control circuit and the second control circuit are made backup power supply circuits for each other by the connecting switch and the third contactor, thereby providing reliability for the auxiliary power supply control circuit to supply power to auxiliary equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A control schematic diagram of an auxiliary power supply control circuit provided in an embodiment of the present application;

[0023] Figure 2 A control schematic diagram of an auxiliary power supply control device provided in an embodiment of the present application.

[0024] Explanation of the reference numerals: 1KB-first transformer; KM1-first contactor; 2KB-second transformer; KM2-second contactor; QF1-connecting switch; KM3-third contactor; KA1-relay; QK1-first circuit breaker; QK2-second circuit breaker; FU1-first fuse; FU2-second fuse; FU3-third fuse; FU4-fourth fuse; 110-first auxiliary equipment; 120-second auxiliary equipment; 130-control unit. DETAILED DESCRIPTION

[0025] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0026] Figure 1 A control schematic diagram of an auxiliary power supply control circuit provided in an embodiment of the present application. Figure 1 As shown, the auxiliary power supply control circuit includes: a first control circuit, a second control circuit and a switching control circuit. The first control circuit includes: a first transformer 1KB, a first contactor KM1; the second control circuit includes: a second transformer 2KB, a second contactor KM2; the switching control circuit includes: a contact switch QF1, a third contactor KM3.

[0027] Specifically, the first transformer 1KB in the first control circuit converts the high voltage provided by the main power distribution circuit into a low voltage, and outputs the converted low voltage to the first auxiliary device 110; the second transformer 2KB in the second control circuit also converts the high voltage provided by the main power distribution circuit into a low voltage, and outputs the converted low voltage to the second auxiliary device 120, wherein the first transformer 1KB and the second transformer 2KB are both isolation transformers, which can reduce the high voltage of AC690V to the low voltage of AC220V, and the output low voltage is used as the auxiliary control power supply of the auxiliary device. The connecting switch QF1 in the switching control circuit is connected to the output ends of the first control circuit and the second control circuit, and is used to switch the output circuits of the first control circuit and the second control circuit.

[0028] The two high-voltage incoming terminals of the first transformer 1KB are connected to the first group of high-voltage incoming terminals of the main distribution circuit, the two low-voltage output terminals of the first transformer 1KB are respectively connected to the two connection points of the coil of the first contactor KM1, and the two low-voltage output terminals of the first transformer 1KB are also respectively connected to the first live wire output terminal 1L01 and the first neutral wire output terminal 1N01 through the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1; the first live wire output terminal 1L01 and the first neutral wire output terminal 1N01 are the first group of output terminals for connecting the first auxiliary equipment 110.

[0029] Among them, the first group of high-voltage incoming line terminals of the main distribution circuit includes: a first high-voltage incoming line terminal 1L1 and a second high-voltage incoming line terminal 1L2. The first high-voltage incoming line terminal 1L1 and the second high-voltage incoming line terminal 1L2 are respectively connected to the two high-voltage incoming line terminals of the first transformer 1KB, so that the first transformer 1KB receives the high voltage provided by the main distribution circuit, and reduces the high voltage (AC690V) to a low voltage (AC220V), and outputs the low voltage through the two low-voltage output terminals of the first transformer 1KB. Since the first live wire output terminal 1L01 and the first neutral wire output terminal 1N01 are used to connect the first auxiliary device 110, the low voltage is output to the first auxiliary device 110.

[0030] When the first control circuit receives a high voltage, the coil of the first contactor KM1 is energized, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 are closed, thereby enabling the first control circuit to output a low voltage to the first auxiliary device 110; when the first control circuit does not receive a high voltage, i.e., the power is cut off, the coil of the first contactor KM1 is disconnected, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 are disconnected, and the first control circuit cannot output a low voltage to the first auxiliary device 110.

[0031] The two high-voltage incoming terminals of the second transformer 2KB are connected to the second group of high-voltage incoming terminals of the main distribution circuit, the two low-voltage output terminals of the second transformer 2KB are respectively connected to the two connection points of the coil of the second contactor KM2, and the two low-voltage output terminals of the second transformer 2KB are also respectively connected to the second live wire output terminal 2L01 and the second neutral wire output terminal 2N01 through the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2; the second live wire output terminal 2L01 and the second neutral wire output terminal 2N01 are the second group of output terminals for connecting the second auxiliary equipment 120.

[0032] Among them, the second group of high-voltage incoming line terminals of the main distribution circuit include: a third high-voltage incoming line terminal 2L1 and a fourth high-voltage incoming line terminal 2L2. The third high-voltage incoming line terminal 2L1 and the fourth high-voltage incoming line terminal 2L2 are respectively connected to the two high-voltage incoming line terminals of the second transformer 2KB, so that the second transformer 2KB receives the high voltage provided by the main distribution circuit, and reduces the high voltage (AC690V) to a low voltage (AC220V), and outputs the low voltage through the two low-voltage output terminals of the second transformer 2KB. Since the second live wire output terminal 2L01 and the second neutral wire output terminal 2N01 are used to connect the second auxiliary device 120, the low voltage is output to the second auxiliary device 120.

[0033] When the second control circuit receives a high voltage, the coil of the second contactor KM2 is energized, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 are closed, thereby enabling the second control circuit to output a low voltage to the second auxiliary device 120; when the second control circuit does not receive a high voltage, i.e., the power is cut off, the coil of the second contactor KM2 is disconnected, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 are disconnected, and the second control circuit cannot output a low voltage to the second auxiliary device 120.

[0034] The first live wire output terminal 1L01 is connected to the second live wire output terminal 2L01 through the first switch unit, the first neutral wire output terminal 1N01 is connected to the second neutral wire output terminal 2N01 through the second switch unit, and the first wiring point is connected to the second wiring point through the connecting switch QF1, wherein the first wiring point is the connection point between the first live wire output terminal 1L01 and the second live wire output terminal 2L01, the second wiring point is the connection point between the first neutral wire output terminal 1N01 and the second neutral wire output terminal 2N01, and the first wiring point and the second wiring point are respectively used to connect the control unit 130 of the connecting switch QF1.

[0035] The first live wire output terminal 1L01 is connected to the second live wire output terminal 2L01 through the first group of main contacts (1, 2) of the third contactor KM3, and the first neutral wire output terminal 1N01 is connected to the second neutral wire output terminal 2N01 through the second group of main contacts (3, 4) of the third contactor KM3; the first wiring point is connected to the coil of the third contactor KM3 through the contact switch QF1 and connected to the second wiring point.

[0036] Optionally, the contact switch QF1 is connected to the coil of the third contactor KM3 through the auxiliary contacts (11, 12) of the first contactor KM1 and the auxiliary contacts (11, 12) of the second contactor KM2 respectively.

[0037] The rated current and model of the first contactor KM1, the second contactor KM2 and the third contactor KM3 can be selected according to the power consumption of the first auxiliary device 110 and the second auxiliary device 120. The first contactor KM1 and the second contactor KM2 are used as the switching of the first control circuit and the second control circuit respectively, and the third contactor KM3 is used as the automatic standby of the auxiliary power control circuit, which is connected to the output ends of the first control circuit and the second control circuit. When the first control circuit is powered off and the second control circuit is powered normally, the second control circuit outputs a low voltage to the second auxiliary device 120, and outputs a low voltage to the first auxiliary device 110 through the third contactor KM3 and the contact switch QF1; when the first control circuit is powered normally and the second control circuit is powered off, the first control circuit outputs a low voltage to the first auxiliary device 110, and outputs a low voltage to the second auxiliary device 120 through the third contactor KM3 and the contact switch QF1; the switching of the output circuits of the first control circuit and the second control circuit in the auxiliary power control circuit is realized.

[0038] Specifically, when both the first control circuit and the second control circuit receive a high voltage, that is, when the power supply is normal, the coil of the first contactor KM1 is energized, then the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 are closed, and the auxiliary contacts (11, 12) of the first contactor KM1 are disconnected. When the coil of the second contactor KM2 is energized, then the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 are closed, and the auxiliary contacts (11, 12) of the second contactor KM2 are disconnected, and the coil of the third contactor KM3 is disconnected. At this time, the first control circuit outputs a low voltage to the first auxiliary device 110, and the second control circuit outputs a low voltage to the second auxiliary device 120.

[0039] When the first control circuit does not receive a high voltage, i.e., it is powered off, and when the second control circuit receives a high voltage, the coil of the first contactor KM1 is disconnected, the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 are disconnected, the auxiliary contacts (11, 12) of the first contactor KM1 are closed, the coil of the second contactor KM2 is energized, the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 are closed, the auxiliary contacts (11, 12) of the second contactor KM2 are disconnected, and the coil of the third contactor KM3 is disconnected. If the control unit 130 controls the contact switch QF1 to be closed, due to the auxiliary contacts (11, 12) of the first contactor KM1, the auxiliary contacts (11, 12) of the first contactor KM1 are closed. 2) and the auxiliary contacts (11, 12) of the second contactor KM2 are connected in parallel between the contact switch QF1 and the coil of the third contactor KM3, so at this time the coil of the third contactor KM3 is automatically attracted, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the third contactor KM3 are attracted, and the second control circuit outputs a low voltage to the second auxiliary device 120, and at the same time, the second control circuit outputs a low voltage to the first auxiliary device 110 through the contact switch QF1 and the third contactor KM3, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 are disconnected to prevent the low voltage output by the second control circuit from being input into the first transformer 1KB. If the first control circuit receives a high voltage, it outputs a low voltage to the first auxiliary device 110 and the second auxiliary device 120 through the first control circuit and the second control circuit respectively according to the power supply mode under normal power supply conditions.

[0040] When the first control circuit receives a high voltage, and the second control circuit does not receive a high voltage, i.e., is powered off, the coil of the first contactor KM1 is energized, the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 are closed, the auxiliary contacts (11, 12) of the first contactor KM1 are disconnected, the coil of the second contactor KM2 is disconnected, the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 are disconnected, the auxiliary contacts (11, 12) of the second contactor KM2 are closed, and the coil of the third contactor KM3 is disconnected. If the control unit 130 controls the contact switch QF1 to be closed, due to the auxiliary contacts (11, 12) of the first contactor KM1, the auxiliary contacts (11, 12) of the second contactor KM2 are closed. 2) and the auxiliary contacts (11, 12) of the second contactor KM2 are connected in parallel between the contact switch QF1 and the coil of the third contactor KM3, so at this time the coil of the third contactor KM3 is automatically attracted, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the third contactor KM3 are attracted, and the first control circuit outputs a low voltage to the first auxiliary device 110, and at the same time, the first control circuit outputs a low voltage to the second auxiliary device 120 through the contact switch QF1 and the third contactor KM3, and the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 are disconnected to prevent the low voltage output by the first control circuit from being input into the second transformer 2KB. If the second control circuit receives a high voltage, it outputs a low voltage to the first auxiliary device 110 and the second auxiliary device 120 through the first control circuit and the second control circuit respectively according to the power supply mode under normal power supply conditions.

[0041] In summary, an embodiment of the present application provides an auxiliary power supply control circuit, comprising: a first control circuit, a second control circuit and a switching control circuit; wherein the first control circuit comprises: a first transformer, a first contactor; the second control circuit comprises: a second transformer, a second contactor; the switching control circuit comprises: a connecting switch, a third contactor; the first control circuit and the second control circuit are switched on and off by means of the first contactor and the second contactor, and the first control circuit and the second control circuit are made backup power supply circuits for each other by means of the connecting switch and the third contactor, thereby providing reliability for the auxiliary power supply control circuit to supply power to auxiliary equipment.

[0042] Continue to refer Figure 1 The auxiliary power supply control circuit also includes: a relay KA1; a third group of main contacts (11, 12) of the first contactor KM1 is connected to the first neutral line output terminal 1N01 through the coil of the relay KA1; the first switch unit includes: a first group of normally open contacts (13, 14) and a first group of normally closed contacts (51, 52) of the relay KA1; the second switch unit includes: a second group of normally open contacts (23, 24) and a second group of normally closed contacts (61, 62) of the relay KA1.

[0043] Specifically, the relay KA1 is connected to the first control circuit, the first live line output terminal 1L01 is connected to the first neutral line output terminal 1N01 via the third group of main contacts (11, 12) of the first contactor KM1 and the coil of the relay KA1 in sequence, and the opening and closing state of the coil of the relay KA1 is controlled by the third group of main contacts (11, 12) of the first contactor KM1.

[0044] The first live wire output terminal 1L01 is connected to the second live wire output terminal 2L01 in sequence through the first group of normally open contacts (13, 14) and the first group of normally closed contacts (51, 52) of the relay KA1, and the first neutral wire output terminal 1N01 is connected to the second neutral wire output terminal 2N01 in sequence through the second group of normally open contacts (23, 24) and the second group of normally closed contacts (61, 62) of the relay KA1.

[0045] When the first control circuit receives a high voltage, the coil of the first contactor KM1 is energized, and the third group of main contacts (11, 12) of the first contactor KM1 is closed, and the coil of the control relay KA1 is energized, so that the first group of normally open contacts (13, 14) and the second group of normally open contacts (23, 24) of the relay KA1 are closed, and the first group of normally closed contacts (51, 52) and the second group of normally closed contacts (61, 62) of the relay KA1 are disconnected. Since the first group of normally open contacts (13, 14) and the second group of normally open contacts (23, 24) of the relay KA1 are closed, power is supplied to the contact switch QF1 through the low-voltage output end of the first transformer 1KB. When the first control circuit does not receive a high voltage, the line of the first contactor KM1 is closed. The coil is disconnected, the third group of main contacts (11, 12) of the first contactor KM1 is disconnected, and the coil of the control relay KA1 is disconnected, so that the first group of normally open contacts (13, 14) and the second group of normally open contacts (23, 24) of the relay KA1 are disconnected, and the first group of normally closed contacts (51, 52) and the second group of normally closed contacts (61, 62) of the relay KA1 are closed. Since the first group of normally closed contacts (51, 52) and the second group of normally closed contacts (61, 62) of the relay KA1 are closed, power is supplied to the contact switch QF1 through the low-voltage output end of the second transformer 2KB, thereby switching the output circuits of the first control circuit and the second control circuit through the relay KA1, so that the control unit 130 of the contact switch QF1 is always powered.

[0046] Continue to refer Figure 1 The first control circuit also includes: a first circuit breaker QK1, and two low-voltage output ends of the first transformer 1KB are respectively connected to the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the first contactor KM1 through two groups of main contacts of the first circuit breaker QK1.

[0047] Optionally, the first control circuit further includes: a first fuse FU1, and one of the two high-voltage incoming line terminals of the first transformer 1KB is connected to a first group of high-voltage incoming line terminals of the main distribution circuit through the first fuse FU1.

[0048] Optionally, the first control circuit further includes: a second fuse FU2, and the other high-voltage incoming line terminal of the two high-voltage incoming line terminals of the first transformer 1KB is connected to the first group of high-voltage incoming line terminals of the main distribution circuit through the second fuse FU2.

[0049] The first circuit breaker QK1 is connected to two low-voltage output ends of the first transformer 1KB. If a fault occurs in the first control circuit, the two sets of main contacts of the first circuit breaker QK1 are disconnected, thereby protecting the first control circuit and the first auxiliary device 110.

[0050] The first fuse FU1 and the second fuse FU2 are also used to protect the circuit elements in the first control circuit. When the current is too high or exceeds the load current, the circuit is disconnected by fusing themselves to protect the circuit elements in the circuit from being burned out.

[0051] Optionally, the second control circuit also includes: a second circuit breaker QK2, and two low-voltage output terminals of the second transformer 2KB are respectively connected to the first group of main contacts (1, 2) and the second group of main contacts (3, 4) of the second contactor KM2 through two groups of main contacts of the second circuit breaker QK2.

[0052] Optionally, the second control circuit further includes: a third fuse FU3, and one of the two high-voltage incoming line terminals of the second transformer 2KB is connected to the second group of high-voltage incoming line terminals of the main distribution circuit through the third fuse FU3.

[0053] Optionally, the second control circuit further includes: a fourth fuse FU4, and the other high-voltage incoming line terminal of the two high-voltage incoming line terminals of the second transformer 2KB is connected to the second group of high-voltage incoming line terminals of the main distribution circuit through the fourth fuse FU4.

[0054] The second circuit breaker QK2 is connected to two low-voltage output ends of the second transformer 2KB. If a fault occurs in the second control circuit, the two sets of main contacts of the second circuit breaker QK2 are disconnected, thereby protecting the second control circuit and the second auxiliary device 120.

[0055] The third fuse FU3 and the fourth fuse FU4 are also used to protect the circuit elements in the second control circuit. When the current is too high or exceeds the load current, the circuit is disconnected by fusing themselves to protect the circuit elements in the circuit from being burned out.

[0056] Figure 2 A control schematic diagram of an auxiliary power supply control device provided in an embodiment of the present application, such as Figure 2 As shown, the auxiliary power supply control device includes: an auxiliary power supply control circuit, a first auxiliary device 110, a second auxiliary device 120 and a control unit 130, wherein the high-voltage incoming line terminals of the first transformer 1KB and the second transformer 2KB in the auxiliary power supply control circuit are respectively used to connect the first group of high-voltage incoming line terminals and the second group of high-voltage incoming line terminals of the main distribution circuit; the connecting switch QF1 in the auxiliary power supply control circuit is connected to the control unit 130, and the first group of output terminals and the second group of output terminals in the auxiliary power supply control circuit are respectively connected to the power supply terminals of the first auxiliary device 110 and the second auxiliary device 120. The auxiliary power supply control circuit is the auxiliary power supply control circuit provided in the above-mentioned embodiments, which are all described in detail and will not be repeated here.

[0057] Although the present application is disclosed as above, the present application is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present application. Therefore, the protection scope of the present application shall be subject to the scope defined by the claims.

Claims

1. An auxiliary power supply control circuit, characterized in that: The auxiliary power supply control circuit includes: a first control circuit, a second control circuit and a switching control circuit; wherein the first control circuit includes: a first transformer and a first contactor; the second control circuit includes: a second transformer and a second contactor; the switching control circuit includes: a tie switch and a third contactor; The two high-voltage inlet terminals of the first transformer are connected to the first group of high-voltage inlet terminals of the main power distribution circuit, the two low-voltage output terminals of the first transformer are respectively connected to the two connection points of the coil of the first contactor, and the two low-voltage output terminals of the first transformer are also respectively connected to the first live wire output terminal and the first neutral wire output terminal through the first group of main contacts and the second group of main contacts of the first contactor; the first live wire output terminal and the first neutral wire output terminal are the first group of output terminals for connecting the first auxiliary equipment; The two high-voltage inlet terminals of the second transformer are connected to the second group of high-voltage inlet terminals of the main power distribution circuit, the two low-voltage output terminals of the second transformer are respectively connected to the two connection points of the coil of the second contactor, and the two low-voltage output terminals of the second transformer are also respectively connected to the second live wire output terminal and the second neutral wire output terminal through the first group of main contacts and the second group of main contacts of the second contactor; the second live wire output terminal and the second neutral wire output terminal are the second group of output terminals for connecting the second auxiliary equipment; The first live wire output terminal is connected to the second live wire output terminal through a first switch unit, the first neutral wire output terminal is connected to the second neutral wire output terminal through a second switch unit, and the first wiring point is connected to the second wiring point through the tie switch, wherein the first wiring point is a connection point between the first live wire output terminal and the second live wire output terminal, the second wiring point is a connection point between the first neutral wire output terminal and the second neutral wire output terminal, and the first wiring point and the second wiring point are respectively used to connect a control unit of the tie switch; The first live wire output terminal is connected to the second live wire output terminal through the first group of main contacts of the third contactor, and the first neutral wire output terminal is connected to the second neutral wire output terminal through the second group of main contacts of the third contactor; the first wiring point is connected to the coil of the third contactor and connected to the second wiring point through the connecting switch.

2. The circuit according to claim 1, characterized in that The contact switch is connected to the coil of the third contactor through the auxiliary contact of the first contactor and the auxiliary contact of the second contactor respectively.

3. The circuit according to claim 1, characterized in that The auxiliary power supply control circuit further includes: a relay; the third group of main contacts of the first contactor is connected to the first neutral line output terminal through the coil of the relay; the first switch unit includes: a first group of normally open contacts and a first group of normally closed contacts of the relay; the second switch unit includes: a second group of normally open contacts and a second group of normally closed contacts of the relay; The first live wire output terminal is connected to the second live wire output terminal through the first group of normally open contacts and the first group of normally closed contacts of the relay in sequence, and the first neutral wire output terminal is connected to the second neutral wire output terminal through the second group of normally open contacts and the second group of normally closed contacts of the relay in sequence.

4. The circuit according to claim 1, characterized in that The first control circuit further includes: a first circuit breaker, and two low-voltage output terminals of the first transformer are respectively connected to a first group of main contacts and a second group of main contacts of the first contactor through two groups of main contacts of the first circuit breaker.

5. The circuit according to claim 1, characterized in that The first control circuit further includes: a first fuse, through which one of the two high-voltage incoming line terminals of the first transformer is connected to a first group of high-voltage incoming line terminals of a main power distribution circuit.

6. The circuit according to claim 1, characterized in that The first control circuit further includes: a second fuse, through which the other high-voltage incoming line terminal of the two high-voltage incoming line terminals of the first transformer is connected to the first group of high-voltage incoming line terminals of the main power distribution circuit.

7. The circuit according to claim 1, characterized in that The second control circuit further includes: a second circuit breaker, and two low-voltage output terminals of the second transformer are respectively connected to the first group of main contacts and the second group of main contacts of the second contactor through two groups of main contacts of the second circuit breaker.

8. The circuit according to claim 1, characterized in that The second control circuit further includes: a third fuse, through which one of the two high-voltage incoming line terminals of the second transformer is connected to a second group of high-voltage incoming line terminals of the main power distribution circuit.

9. The circuit according to claim 1, characterized in that The second control circuit further includes: a fourth fuse, through which the other high-voltage incoming line terminal of the two high-voltage incoming line terminals of the second transformer is connected to the second group of high-voltage incoming line terminals of the main power distribution circuit.

10. An auxiliary power supply control device, characterized in that: The auxiliary power supply control device includes: an auxiliary power supply control circuit, a first auxiliary device, a second auxiliary device and a control unit, wherein the high-voltage incoming line terminals of the first transformer and the second transformer in the auxiliary power supply control circuit are respectively used to connect the first group of high-voltage incoming line terminals and the second group of high-voltage incoming line terminals of the main distribution circuit; the connecting switch in the auxiliary power supply control circuit is connected to the control unit, and the first group of output terminals and the second group of output terminals in the auxiliary power supply control circuit are respectively connected to the power supply terminals of the first auxiliary device and the second auxiliary device, and the auxiliary power supply control circuit is the auxiliary power supply control circuit described in any one of claims 1 to 9 above.

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