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CLLC bidirectional DC-DC converter and control method

A DC converter, bidirectional DC technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, conversion equipment with intermediate conversion to AC, etc., can solve the problem of high frequency ripple current, high cost, Increase cost and other issues to achieve the effect of reducing high-frequency current ripple, reducing volume and cost, and increasing control cost

Inactive Publication Date: 2020-07-24
VIRIDI E MOBILITY TECH NINGBO CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] (1) The number of power semiconductor devices is large, and the corresponding drive circuits are also large, resulting in a large volume and high cost of the bidirectional DC-DC converter;
[0004] (2) Parallel connection of two full-bridge CLLCs or staggered parallel connection on the control will make the high-frequency ripple current of the output filter capacitor larger, and the effective value of the ripple current can reach 32% of the output current at most, and the required output filter capacitor a large number;
[0005] (3) Parallel connection of two full-bridge CLLCs needs to increase the current sharing control circuit, which will also increase the cost

Method used

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  • CLLC bidirectional DC-DC converter and control method
  • CLLC bidirectional DC-DC converter and control method
  • CLLC bidirectional DC-DC converter and control method

Examples

Experimental program
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no. 1 example

[0039] figure 1 It is a structural block diagram of the CLLC bidirectional DC-DC converter provided by the first embodiment of the present invention. figure 2 yes figure 1 The circuit diagram of the CLLC bidirectional DC-DC converter in . The CLLC bidirectional DC-DC converter has its own current sharing capability in hardware, and does not require an additional current sharing control circuit, which greatly reduces the cost. Please refer to figure 1 and figure 2 , the CLLC bidirectional DC-DC converter of this embodiment includes: primary side filter capacitor C1, primary side bridge 10, primary side resonant device 11, transformer device 12, secondary side resonant device 13, secondary side bridge 14 connected in sequence And the secondary filter capacitor C8.

[0040] Specifically, the primary-side bridge 10 includes three primary-side half-bridges, each primary-side half-bridge is composed of two switch tubes connected in series, and each primary-side half-bridge is...

no. 2 example

[0066] At present, there are many rectification output methods for the three-phase interleaved CLLC bidirectional DC-DC converter, and the common one is the three-phase bridge synchronous rectification output, such as Figure 4 As shown, the driving waveforms of the primary side and the secondary side are the same. However, with this synchronous rectification output mode, the synchronous rectification output voltage value of the CLLC bidirectional DC-DC converter is limited by the output voltage gain of the converter. If the output voltage range is to be further increased, the design turn ratio of the transformer needs to be increased, which will lead to Increasing the size of the magnetic core and the number of turns of the coil increases the size and cost of the three-phase interleaved CLLC bidirectional DC-DC converter.

[0067] In order to solve the above problems, the present invention proposes a novel control method. When the three-phase interleaved CLLC converter perfor...

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Abstract

The embodiment of the invention discloses a CLLC bidirectional DC-DC converter and a control method, and belongs to the technical field of power electronics. The CLLC bidirectional DC-DC converter comprises a primary side filter capacitor (C1), a primary side bridge (10), a primary side resonance device (11), a voltage transformation device (12), a secondary side resonance device (13), a secondaryside bridge (14) and a secondary side filter capacitor (C8) which are connected in sequence, wherein the primary side bridge includes three primary side half bridges; the primary side resonance device includes three groups of primary side series resonance devices; the voltage transformation device is connected with the primary side resonance device and the secondary side resonance device; three groups of secondary side resonance devices are arranged, each group of secondary side resonance devices includes a resonance capacitor, one end of each resonance capacitor is connected with one secondary side terminal of one transformer, and the other end of each resonance capacitor is connected with one secondary side half bridge in the secondary side bridge; and the secondary side bridge includesthree secondary side half bridges. In the invention, hardware has a current sharing capability, an additional current sharing control circuit is not needed, and cost is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a CLLC bidirectional DC-DC converter and a control method. Background technique [0002] At present, in the application of high-voltage and high-power isolated bidirectional DC-DC converters, limited by the selection of power devices, it is difficult to realize a single full-bridge CLLC. The commonly used circuit topology is to use two full-bridge CLLCs in parallel. The parallel connection of two full-bridge CLLCs means that the two full-bridge CLLCs work in parallel, each full-bridge CLLC shares half of the power, and the number of power semiconductor devices is 16. Each full-bridge CLLC can realize bidirectional conversion of energy. However, the currently adopted technical solution of parallel connection of two full-bridge CLLCs mainly has the following three disadvantages: [0003] (1) The number of power semiconductor devices is large, and the corresponding drive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335H02M1/14
CPCH02M1/14H02M3/28H02M3/3353Y02B70/10
Inventor 蒋劲松郑剑锋汪易强庄启超郭水保
Owner VIRIDI E MOBILITY TECH NINGBO CO LTD