AC-DC power supply DC side short circuit protection circuit, method and chip

Abstract

The invention discloses an AC-DC power supply direct current side short circuit protection circuit, method and chip, the circuit comprises a bidirectional protection switch unit and an AC-DC power supply internal circuit, the bidirectional protection switch unit is arranged on an AC-DC power supply external direct current bus, the bidirectional protection switch unit is connected with the AC-DC power supply internal circuit, and the bidirectional protection switch unit is connected with the AC-DC power supply external direct current bus. The AC-DC power supply internal circuit comprises a rectification unit and a filtering unit, and the rectification unit is connected with the bidirectional protection switch unit and the filtering unit. The first electronic switch and the second electronic switch are additionally arranged at the output port of the direct-current bus of the power supply to introduce a brand new bidirectional protection switch, so that the bidirectional protection function of the power supply circuit is realized, the number of added devices is small, the cost is low, the application range is wide, the influence on the efficiency of the whole machine is small, the protection action is fast, the reliability is high, and the practicability is strong; and the power device can be quickly and effectively protected under extreme conditions.

Description

technical field

[0001] The invention relates to the technical field of power supply protection circuits, in particular to a short-circuit protection circuit, method and chip of a DC side of an AC-DC power supply. Background technique

[0002] In the production process of lithium batteries, the power consumption is huge, and energy saving and consumption reduction are very urgent to improve the efficiency of battery manufacturers. At present, the production of lithium batteries adopts a distributed / discrete power supply mode. During the process of dividing the capacity of lithium batteries, the energy of battery charging and discharging should be concentrated to the AC mains power supply terminal of the common node for neutralization and offset. This process removes the same constant current source at the battery terminal. In addition to the DC / DC link, there are two conversion links, DC / DC and DC / AC, at the front stage, and the power loss is relatively large. If the energy ...

Examples

Embodiment 1

[0029] like figure 1 As shown, an AC-DC power supply DC side short-circuit protection circuit includes a bidirectional protection switch unit 1 and an AC-DC power supply internal circuit 2, the bidirectional protection switch unit 1 is arranged on the external DC bus of the AC-DC power supply, and the bidirectional protection switch unit 1 is connected to the internal circuit 2 of the AC-DC power supply. The internal circuit 2 of the AC-DC power supply includes a rectifying unit 21 and a filtering unit 22. The rectifying unit 21 is connected to the bidirectional protection switch unit 1 and the filtering unit 22.

[0030] Further, as figure 2 As shown, the bidirectional protection switch unit 1 includes a first electronic switch Q1 and a second electronic switch Q2, and the first electronic switch Q1 and the second electronic switch Q2 are connected in series. The first electronic switch Q1 and the second electronic switch Q2 are both power devices, including but not limited...

Embodiment 2

[0037] like Figure 5 As shown, a method for short-circuit protection on the DC side of an AC-DC power supply is based on the short-circuit protection circuit on the DC side of an AC-DC power supply described in Embodiment 1, and the steps include:

[0038] S1: When the internal circuit of the AC-DC power supply is short-circuited, the bidirectional protection switch unit triggers the first short-circuit protection function to cut off the short-circuit path of the internal circuit of the AC-DC power supply;

[0039] Specifically, in this embodiment, the emitter E of the first electronic switch Q1 is connected to the emitter E of the second electronic switch as an example, such as image 3 As shown, when the internal circuit of the AC-DC power supply is short-circuited, there is a possibility that a large current will flow into the short-circuit point outside the internal circuit of the power supply, and the short-circuit current flows through the bidirectional protection switc...

Embodiment 3

[0044] An AC-DC power supply DC side short-circuit protection chip includes the above-mentioned AC-DC power supply DC side short-circuit protection circuit.

[0045] For the chips provided by the embodiments of the present invention, for the purpose of brief description, for the parts not mentioned in the embodiments, reference may be made to the corresponding contents in the foregoing embodiments.

[0046] It should be noted that the present invention provides an AC-DC power supply DC side short-circuit protection circuit, method and chip for use in various occasions, including but not limited to the battery capacity division industry, and other high-frequency bidirectional rectification / inversion of similar topologies. The application of variable power supply, and the present invention is also applicable to the protection of topological schemes such as DC-DC.

technical field

[0001] The invention relates to the technical field of power supply protection circuits, in particular to a short-circuit protection circuit, method and chip of a DC side of an AC-DC power supply. Background technique

[0002] In the production process of lithium batteries, the power consumption is huge, and energy saving and consumption reduction are very urgent to improve the efficiency of battery manufacturers. At present, the production of lithium batteries adopts a distributed / discrete power supply mode. During the process of dividing the capacity of lithium batteries, the energy of battery charging and discharging should be concentrated to the AC mains power supply terminal of the common node for neutralization and offset. This process removes the same constant current source at the battery terminal. In addition to the DC / DC link, there are two conversion links, DC / DC and DC / AC, at the front stage, and the power loss is relatively large. If the energy ...

Examples

Embodiment 1

[0029] like figure 1 As shown, an AC-DC power supply DC side short-circuit protection circuit includes a bidirectional protection switch unit 1 and an AC-DC power supply internal circuit 2, the bidirectional protection switch unit 1 is arranged on the external DC bus of the AC-DC power supply, and the bidirectional protection switch unit 1 is connected to the internal circuit 2 of the AC-DC power supply. The internal circuit 2 of the AC-DC power supply includes a rectifying unit 21 and a filtering unit 22. The rectifying unit 21 is connected to the bidirectional protection switch unit 1 and the filtering unit 22.

[0030] Further, as figure 2 As shown, the bidirectional protection switch unit 1 includes a first electronic switch Q1 and a second electronic switch Q2, and the first electronic switch Q1 and the second electronic switch Q2 are connected in series. The first electronic switch Q1 and the second electronic switch Q2 are both power devices, including but not limited...

Embodiment 2

[0037] like Figure 5 As shown, a method for short-circuit protection on the DC side of an AC-DC power supply is based on the short-circuit protection circuit on the DC side of an AC-DC power supply described in Embodiment 1, and the steps include:

[0038] S1: When the internal circuit of the AC-DC power supply is short-circuited, the bidirectional protection switch unit triggers the first short-circuit protection function to cut off the short-circuit path of the internal circuit of the AC-DC power supply;

[0039] Specifically, in this embodiment, the emitter E of the first electronic switch Q1 is connected to the emitter E of the second electronic switch as an example, such as image 3 As shown, when the internal circuit of the AC-DC power supply is short-circuited, there is a possibility that a large current will flow into the short-circuit point outside the internal circuit of the power supply, and the short-circuit current flows through the bidirectional protection switc...

Embodiment 3

[0044] An AC-DC power supply DC side short-circuit protection chip includes the above-mentioned AC-DC power supply DC side short-circuit protection circuit.

[0045] For the chips provided by the embodiments of the present invention, for the purpose of brief description, for the parts not mentioned in the embodiments, reference may be made to the corresponding contents in the foregoing embodiments.

[0046] It should be noted that the present invention provides an AC-DC power supply DC side short-circuit protection circuit, method and chip for use in various occasions, including but not limited to the battery capacity division industry, and other high-frequency bidirectional rectification / inversion of similar topologies. The application of variable power supply, and the present invention is also applicable to the protection of topological schemes such as DC-DC.

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