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Three-switching-tube three-phase PFC circuit control method and series topological structure

A circuit control and topology technology, applied in the field of circuits, can solve the problems of large switching device capacity, large switching loss, electromagnetic interference, etc., and achieve the effects of simple control, low loss, and small electromagnetic interference

Pending Publication Date: 2020-05-12
宋庆国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problems existing in the prior art such as large switching loss, low efficiency, serious electromagnetic interference, and large switching device capacity, the present invention provides a three-switch three-phase PFC circuit control method and a series of topological structures

Method used

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  • Three-switching-tube three-phase PFC circuit control method and series topological structure
  • Three-switching-tube three-phase PFC circuit control method and series topological structure
  • Three-switching-tube three-phase PFC circuit control method and series topological structure

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Embodiment 1

[0090]The three-switch three-phase PFC circuit control method provided by the embodiment of the present invention, the three-switch three-phase PFC circuit control method includes: according to different phase voltages using L i And bidirectional switch PWM driving signal generation module constitutes Boost current converter only for phase voltage (0°~30°), (150°~180°), (180°~210°), (330°~360°) PWM control, so that the phase current and voltage are in phase, and correct the power factor, where i = a, b, c.

[0091] The voltage stress of the compensating bidirectional switch PWM drive signal generation module is expressed as:

[0092]

[0093] where V s Indicates the switch voltage stress, V dc Indicates the DC bus voltage.

Embodiment 2

[0095] Such as Figure 1-Figure 3 The embodiment of the present invention provides a series of PFC topologies including:

[0096] Three high-frequency inductor modules, a three-phase rectifier bridge, and three bidirectional power switch components.

[0097] The three high-frequency inductance modules are connected with the input terminals of the three bidirectional power switch components; the input terminals of the three bidirectional power switch components are connected with the negative terminal of the three-phase rectifier bridge or with the output capacitor.

[0098] The output terminals of the three high-frequency inductance modules are connected with the input terminals of the three-phase rectifier bridge.

[0099] Both ends of the three-phase rectifier bridge are respectively connected to the positive and negative poles of the output capacitor.

[0100] Such as figure 1 The common point of the three bidirectional power switch components is connected to the neutra...

Embodiment 3

[0119] attached figure 2 The structural form is that the common point of the three bidirectional switch components is connected to one end of the energy storage capacitor, and the other end of the output filter capacitor is connected to the "-" pole of the DC power supply. Its characteristics are: reduce the voltage stress of the switching components (V S =V dc -V Ch , where V S Indicates the switching component voltage stress, V dc Indicates the bus voltage, VC h energy storage capacitor voltage), increasing the boost inductance L i The value of (i=a, b, c) reduces the input current harmonics.

[0120] attached image 3 The structural form is: the common point of the three bidirectional power switch components is connected to the midpoint of the output voltage, which is characterized by: reducing the voltage stress of the switch components (V S =V dc / 2, where V S Indicates the switching component voltage stress, V dc Indicates the bus voltage), increase the boost...

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PUM

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Abstract

The invention belongs to the technical field of circuits, and discloses a three-switching-tube three-phase PFC circuit control method with a coupling integrated inductor, and a series topological structure. The series topological structure comprises a three-phase rectifier bridge circuit, the coupling integrated PFC inductor, and a PFC bidirectional power switching device. A conventional rectification circuit needs to output stable direct current after rectification, so a rectifier diode has a conduction blind area; in the blind area, the bidirectional power switching tube of the phase is conducted, so the Vi, the Li and the Si form a conductive loop, the phase current of the phase is supplemented, and the power factor is improved. According to the control strategy provided by the invention, the current and voltage stress of the switching device is reduced, the efficiency is high, and electromagnetic interference is avoided; in order to reduce the number and parameters of PFC inductors, a three-phase coupling integrated inductor is adopted, the inductance value can also be reduced by 1 / 3, the current peak value is reduced by about 15%, and the size and weight of the inductor are reduced by more than 40%.

Description

technical field [0001] The invention belongs to the field of circuit technology, and in particular relates to a three-switch tube three-phase PFC circuit control method and a series of topological structures. Background technique [0002] At present, the closest prior art: a three-phase power factor correction (PFC) circuit has various topological structures such as single-switch tube, two-switch tube, three-switch tube, and six-switch tube. In the low power range, single-switch tubes are more commonly used, and when high-power and energy flow in two directions, six-switch tubes are used more. The three-switch tube is also used in the occasions of medium and high power and one-way flow of energy. [0003] To sum up, the problem existing in the prior art is: because the conventional rectifier circuit needs to output a stable DC after rectification, the rectifier diode has a conduction dead zone (generally corresponding to (0-30°) and (150°-180°) of the phase voltage ) inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/42
CPCH02M1/4216Y02B70/10
Inventor 朱忠尼宋庆国
Owner 宋庆国
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