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A bidirectional buck-boost chopper circuit

A chopper circuit, buck-boost technology, applied to electrical components, adjusting electrical variables, instruments, etc., can solve the problems of increased product cost, inability to realize buck-boost function, etc., to reduce volume and capacity, and reduce pulsation , The effect of increasing the switching frequency

Active Publication Date: 2017-10-31
ZHUZHOU CSR TIMES ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 1) The boost and buck functions can only be realized in one direction, and the buck-boost functions cannot be realized in both directions;
[0007] 2) The switching tubes in the circuit topology need to withstand high voltage stress, among them, the switching tubes in the Buck-Boost circuit need to withstand 2U 1 (U 1 is the voltage stress of the input voltage), and the switch tubes in the other three buck-boost chopper circuit topologies need to withstand U 1 + U 2 (U 2 is the voltage stress of the output voltage); therefore, the application of these circuit topologies in high-voltage applications will be subject to certain restrictions. If a switch tube with a higher voltage level is used to solve this problem, it will inevitably increase the cost of the product

Method used

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  • A bidirectional buck-boost chopper circuit
  • A bidirectional buck-boost chopper circuit
  • A bidirectional buck-boost chopper circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as image 3 As shown, the bidirectional buck-boost chopper circuit in this embodiment includes a first chopping branch, a second chopping branch, a first energy storage capacitor C3, a second energy storage capacitor C4, a first filter capacitor C1, a second Two filter capacitors C2 and energy storage inductance L, one end of the first chopping branch is connected to the first power supply U 1 The positive pole of the end, the other end is connected to the second power supply U 2 The negative pole of the second chopping branch is connected to the first power supply U 1 end of the negative pole, the other end is connected to the second power supply U 2 terminal positive. Both the first chopping branch and the second chopping branch include two switching tubes with the same connection polarity, and the connection polarity of the switching tubes in the first chopping branch and the second chopping branch is opposite, each A switch tube is connected in antiparallel...

Embodiment 2

[0060] Such as Figure 4 As shown, this embodiment is basically the same as Embodiment 1, except that the first chopping branch and the second chopping branch of this embodiment are respectively implemented by a dual-tube IGBT bridge module (V1, V2), that is, by A dual-transistor IGBT bridge module provides two switch tubes and diodes connected in antiparallel with the switch tubes, further simplifying the hardware configuration.

Embodiment 3

[0062] Such as Figure 5 As shown, this embodiment is basically the same as Embodiment 1, the difference is that each switching tube is connected in parallel with a protection circuit in this embodiment, and also includes an input filter circuit arranged at the input end to further filter the input voltage ; and also includes a soft-start circuit arranged on the positive busbar of the input terminal, so as to soft-charge each capacitor through the charging resistor before the circuit of this embodiment works, so that the circuit meets the start-up condition.

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PUM

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Abstract

The invention discloses a bidirectional buck-boost chopper circuit, comprising a first chopping branch, a second chopping branch, a first energy storage capacitor C3, a second energy storage capacitor C4, a first filter capacitor C1, a second The filter capacitor C2 and the energy storage inductance L, the first chopping branch and the second chopping branch both include two switching tubes with the same connection polarity, and the first chopping branch and the second chopping branch The connection polarities of the switching tubes are opposite, and each switching tube is connected in antiparallel with a diode; one end of the first energy storage capacitor C3 is connected to the positive pole of the first power supply U1 terminal, and the other end is connected to the positive pole of the second power supply U2 terminal; the second energy storage capacitor One end of C4 is connected to the negative pole of the first power supply U1 terminal, and the other end is connected to the negative pole of the second power supply U2 terminal. The invention has the advantages of simple structure, capable of realizing bidirectional transmission of energy, simultaneously realizing voltage-boosting functions in both transmission directions, and low voltage stress borne by switch tubes and energy storage capacitors.

Description

technical field [0001] The invention relates to the technical field of chopper circuits, in particular to a bidirectional buck-boost chopper circuit. Background technique [0002] When DC / DC converters are used to drive counter electromotive force loads (such as batteries, supercapacitors, DC motors, etc.), bidirectional energy transmission is often required. For example, when driving batteries and supercapacitor loads, it is required to be able to charge the external power supply, It is also required that it can be discharged to the outside; and when driving a DC motor load, it is often necessary to enable the motor to operate both electrically and regeneratively to feed energy back to the power supply. [0003] In order to enable the DC / DC converter to achieve bidirectional energy transmission, one solution is to use a direct method to connect two unidirectional DC / DC converters in antiparallel, and at the same time make the two DC / DC converters not work at the same time, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/155
Inventor 林文彪翁星方谢湘剑宋乾儒董其爱张祥贺寨王雄唐龙邹今换
Owner ZHUZHOU CSR TIMES ELECTRIC CO LTD