A bidirectional three-level h-bridge non-isolated dc-dc converter

A DC-DC, three-level technology, applied in the direction of adjusting electrical variables, converting DC power input to DC power output, instruments, etc., to achieve the effect of voltage balance, high-precision current change, and wide range of current

Inactive Publication Date: 2020-04-10
CHINA AGRI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The two-level bidirectional H-bridge DC-DC converter proposed in the paper "Research on Multiple Bidirectional H-bridge DC / DC Converters" can realize wide voltage range output, but it is only suitable for lower voltage level occasions

Method used

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  • A bidirectional three-level h-bridge non-isolated dc-dc converter
  • A bidirectional three-level h-bridge non-isolated dc-dc converter
  • A bidirectional three-level h-bridge non-isolated dc-dc converter

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Embodiment Construction

[0014] In the following, specific implementation manners of the present application will be described with reference to the accompanying drawings.

[0015] like figure 1 As shown, two voltage-dividing capacitors C1 and C2 are connected in series end to end in parallel between the positive and negative poles of the power supply DC to divide the voltage of the power supply. The H-bridge is composed of two three-level half-bridge circuits H1 and H2, and H1 and H2 are connected in parallel between the positive and negative poles of the power supply.

[0016] In the half-bridge circuit H1, four switching tubes T1-T4 are connected in series end to end, and a diode D1-D4 is connected in antiparallel to both sides of each tube, which is called a diode-clamped three-level topology. In addition, two diodes D9 and D10 are forward connected in series, the cathode is connected between T1 and T2 switch tubes, the anode is connected between T3 and T4 switch tubes, and the connection of D9 a...

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Abstract

The invention discloses a bidirectional three-level H-bridge non-isolated DC-DC converter. The converter is mainly applied to the battery detection and battery formation equipment to realize the DC chopping function, thereby performing high-precision and wide-voltage range charging / discharging on an accumulator; the advantage of the DC-DC converter is more obvious in the application scene with high-input voltage (about 1000V) and large power. By adopting the hardware topologic structure of three-level, the switch tube voltage stress is reduced, the switch selection is simplified, the equivalent output switch frequency is improved, and the inductor volume and the equipment volume are reduced. The device is mainly composed of two voltage-dividing capacitors, two diode clamping type three-level bridge arms, and two groups of energy-storage inductors and filter capacitors. By effectively controlling the designed topologic switch array, the output voltage and current wide range change can be realized, the polarity can be continuously regulated between the positive and the negative, and the mid-point voltage balance is maintained.

Description

technical field [0001] The invention relates to the field of non-isolated DC-DC conversion, and is particularly suitable for application places of high output voltage and wide-range bidirectional control of voltage and current. Background technique [0002] For the application scenario of high output voltage and wide range of voltage and current bidirectional control, searching the existing literature and products, there is no suitable power electronic topology to meet the requirements. The two-level bidirectional H-bridge DC-DC converter proposed in the paper "Research on Multiple Bidirectional H-bridge DC / DC Converters" can realize wide voltage range output, but it is only suitable for lower voltage level occasions. The three-level topology can be suitable for high-voltage places, but it is mostly used in bidirectional AC / DC at present, such as patent CN201510846654.0. [0003] In view of the above problems, after research, this application proposes a three-level H-bridge...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/158
CPCH02M3/1582H02M3/1584
Inventor 杜海江林志法齐涛丁来伟宋冬冬
Owner CHINA AGRI UNIV
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