PO mode enhanced CLLC resonant bidirectional DC/DC converter topology

An enhanced converter technology, applied in the direction of converting DC power input to DC power output, instruments, and adjusting electrical variables, can solve the problems of increasing PO mode power and frequency range, and deteriorating operating characteristics, so as to achieve strong load capacity , wide gain range, high efficiency effect

Active Publication Date: 2021-04-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the existing CLLC resonant bidirectional DC / DC converter will switch to PON mode operation when the output power rises or the switching frequency decreases, resulting in poor operating characteristics, the present invention proposes a PO mode enhanced CLLC resonant bidirectional DC converter. / DC converter topology, the invention adds two auxiliary control switch tubes between each bridge arm, by blocking the current on the rectification side, it can greatly increase the power and frequency range of the PO mode, and improve the CLLC resonance bidirectional DC / The gain curve of the DC converter so that the CLLC resonant bidirectional DC / DC converter does not fall into PON mode during operation

Method used

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  • PO mode enhanced CLLC resonant bidirectional DC/DC converter topology
  • PO mode enhanced CLLC resonant bidirectional DC/DC converter topology
  • PO mode enhanced CLLC resonant bidirectional DC/DC converter topology

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Embodiment

[0031] In order to better illustrate the present invention, this embodiment will show a simulation example of PO mode enhanced CLLC resonant bidirectional DC / DC converter, the topology is as follows figure 1 shown. Because the circuit topology of this embodiment has complete symmetry, only a forward simulation is needed to illustrate the advantages of the invention.

[0032] The specific parameter design is shown in Table 1:

[0033] Table 1. Simulation circuit parameter table

[0034] parameter value Input voltage 600V Transformer ratio 1.5 Primary side first resonant inductance L r1

101.19μH Secondary resonant inductance L r2

45.3μH Primary side first resonant capacitor C cr1

15.92nF Secondary resonant capacitor C cr2

35.83nF Magnetizing inductance 611.46μH Resonant frequency 125kHz Load Resistance 90Ω

[0035] The topology control method is:

[0036] When running forward, when r...

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Abstract

The invention discloses a PO mode enhanced CLLC resonant bidirectional DC/DC converter topology, which is characterized in that an auxiliary switching tube is additionally added between an input bridge arm and an output bridge arm on the basis of a CLLC resonant bidirectional DC/DC converter, and the PO mode operation range of the CLLC resonant bidirectional DC/DC converter can be widened by controlling the auxiliary switching tube. Therefore, the converter topology can maintain PO mode operation at a lower frequency and a higher power without falling into a PON mode, so that the converter topology has stronger load capacity and a wider voltage gain range. When the inverter works below the resonance point frequency, the inverter side switch tube is switched on at zero voltage, and the rectifier side switch tube is switched on at zero current and switched off at zero current, so that the inverter has very high efficiency.

Description

technical field [0001] The invention relates to the technical field of bidirectional resonant DC / DC converters, in particular to a PO mode enhanced CLLC resonant bidirectional DC / DC converter topology. Background technique [0002] With the rapid development of technologies such as new energy, electric vehicles, and DC micro-grids, the application of bidirectional DC / DC converters is becoming more and more extensive. Resonant bidirectional DC / DC converters have the advantages of simple structure and good soft switching performance. received widespread attention. The CLLC resonant bidirectional DC / DC converter presents completely symmetrical forward and reverse operation characteristics, which greatly reduces the difficulty of circuit design and controller design, and both forward and reverse operation can realize soft switching in the full load range, with high efficiency. [0003] When the CLLC resonant bidirectional DC / DC converter is under-resonant, it can be divided in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCY02B70/10
Inventor 康龙云赵子先李杰于玮
Owner SOUTH CHINA UNIV OF TECH
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