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Control method and device of PFC circuit

A circuit and controller technology, applied in output power conversion devices, electrical components, high-efficiency power electronic conversion, etc., can solve problems such as damage to synchronous rectifier switching tubes, and achieve the effect of avoiding impact heat, simple implementation and low cost.

Pending Publication Date: 2020-11-20
VERTIV CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present invention provides a control method and device for a PFC circuit, which is used to solve the problem of synchronous damage to the synchronous The problem of rectifying the switching tube, and the realization is simple and the cost is low

Method used

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  • Control method and device of PFC circuit
  • Control method and device of PFC circuit
  • Control method and device of PFC circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] A control method of a PFC circuit provided by an embodiment of the present invention, its specific flow is as follows image 3 shown, including the following steps:

[0084] In step 301, a shutdown instruction is received.

[0085] The shutdown command may include but not limited to the shutdown command issued by the hardware, for example, when it is detected that the level signal of the port receiving the shutdown command in the controller is flipped, the shutdown command generated is triggered; the shutdown command may also include but not limited to the software The generated shutdown command, for example, can be triggered by the flipping of the hardware switch of the PFC circuit device or the overcurrent protection switch of the PFC circuit, or the shutdown command generated by the controller according to the shutdown command received from the user, for example The shutdown instruction generated by the controller when detecting an overcurrent fault in the PFC circu...

Embodiment 2

[0095] The specific flow of another PFC circuit control method provided by the embodiment of the present invention, as Figure 4 shown, including the following steps:

[0096] In step 401, a shutdown instruction is received.

[0097] The shutdown command may include but not limited to the shutdown command issued by the hardware, for example, when it is detected that the level signal of the port receiving the shutdown command in the controller is flipped, the shutdown command generated is triggered; the shutdown command may also include but not limited to the software The generated shutdown command, for example, can be triggered by the flipping of the hardware switch of the PFC circuit device or the overcurrent protection switch of the PFC circuit, or the shutdown command generated by the controller according to the shutdown command received from the user, for example The shutdown instruction generated by the controller when detecting an overcurrent fault in the PFC circuit ca...

Embodiment 3

[0107] This embodiment describes in detail the implementation process of the control method of the PFC circuit. When the shutdown command is received, if the PFC circuit is in the stage of inductive energy storage, in this type of shutdown, the prior art will cause a shutdown with a relatively large thermal risk, which usually occurs In the case of PFC circuit inductor current overcurrent protection or shutdown operation under heavy load, the thermal risk is more serious when PFC circuit current overcurrent protection occurs. When PFC circuit current overcurrent protection occurs, the inductor current has reached the limit The peak value corresponds to the maximum inductor current.

[0108] In the triangular wave current mode control mode, when the shutdown moment occurs in the PFC inductor energy storage stage, the inductor current waveform is as follows: Figure 5 As shown, the waveform 501 is the current waveform diagram of the inductance component, and Ia is the current va...

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PUM

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Abstract

The invention discloses a PFC circuit control method and device, and aims to solve the problem that in the prior art, when a PFC circuit is shut down and the current of an inductance assembly is discharged through a parasitic diode of a synchronous rectification switching tube, the generated impact heat energy damages the synchronous rectification switching tube. The method is simple to implementand lower in cost, and comprises the following steps: determining to receive a shutdown instruction for instructing to close a PFC circuit; and controlling main switching tubes in a first switching tube and a second switching tube to be switched off, and controlling synchronous rectification switching tubes in the first switching tube and the second switching tube to be switched on.

Description

technical field [0001] The invention relates to the field of power switch circuits, in particular to a control method and device for a PFC circuit. Background technique [0002] At present, AC and DC switching power supplies are generally divided into two-stage topological structures, the former stage is a power factor correction PFC circuit, and the latter stage is a DC-to-DC circuit. PFC circuits have a variety of topologies, typical totem-pole PFC circuits, such as figure 1 As shown, it includes a first bridge arm and a second bridge arm connected in parallel between the busbars, the midpoint of the first bridge arm is connected to one end of the AC power supply through the inductance component 15, and the midpoint of the second bridge arm is connected to the AC power supply The other end is connected, and the first bridge arm includes a first switch tube 11 and a second switch tube 12 connected in series, and the second bridge arm includes a third switch tube 13 and a f...

Claims

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Application Information

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IPC IPC(8): H02M1/42
CPCH02M1/4233Y02B70/10
Inventor 傅华兴杨瑞国李剑栗小辉
Owner VERTIV CORP