Bidirectional DCDC power conversion circuit

A technology for converting circuits and power, applied in the field of electronics, can solve problems such as increased heat generation, reduced product reliability, and increased product cost, and achieve the effects of suppressing peak voltage, improving reliability, and reducing difficulty in model selection

Pending Publication Date: 2021-05-28
SHENZHEN INCREASE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the clamping diode has problems with reverse recovery characteristics and increased heat generation. Additional heat sinks and diodes with better reverse recovery characteristics are required, resulting in increased product costs and reduced product reliability.

Method used

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  • Bidirectional DCDC power conversion circuit
  • Bidirectional DCDC power conversion circuit
  • Bidirectional DCDC power conversion circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Please refer to figure 1 , a bidirectional DCDC power conversion circuit, comprising a full bridge rectifier circuit, a transformer, a first diode, a second diode, a first capacitor, a first inductor and a switch circuit;

[0090] The first end of the full-bridge rectifier circuit is respectively connected to the positive pole of the preset first input and output terminal and the negative pole of the first diode, and the second terminal is respectively connected to the negative pole of the preset first input and output terminal and the second The anode of the diode is connected, the third end is connected to one end of the first capacitor, and the fourth end is connected to one end of the first inductance; wherein, the third end is figure 1 In point A, the fourth end is figure 1 Point B in the first input and output terminal; a filter capacitor C3 is connected in parallel at both ends of the first input and output terminal; the first capacitor is a DC blocking capacito...

Embodiment 2

[0096]The difference between this embodiment and Embodiment 1 is that this embodiment specifically defines the switch circuit and its connection relationship;

[0097] Please refer to figure 2 , the switch circuit includes a fifth MOS transistor and a sixth MOS transistor;

[0098] The secondary coil of the transformer is divided into a first coil Ns1 and a second coil Ns2 through a secondary tap; the end of Ns2 away from the tap is the third end of the transformer, and the end of Ns1 away from the tap is the third end of the transformer. Four terminals; the number of turns of Ns1 is the same as that of Ns2;

[0099] Specifically, the secondary tap of the transformer is connected to the other end of the second inductor; the third end of the transformer is connected to the drain of the fifth MOS transistor, and the fourth end is connected to the drain of the sixth MOS transistor. The drain is connected; the source of the fifth MOS transistor and the source of the sixth MOS t...

Embodiment 3

[0106] The difference between this embodiment and Embodiment 1 or 2 is that this embodiment also includes a logic circuit and an enabling control circuit;

[0107] controlling the switch circuit on the secondary side of the transformer through the logic control circuit and the enable control circuit;

[0108] Specifically, the logic control circuit includes a first logic circuit and a second logic circuit; the input terminals of the first logic circuit are respectively connected to the gate of the first MOS transistor and the gate of the fourth MOS transistor, and the output terminal is connected with the first control terminal of the switch circuit; the input terminal of the second logic circuit is respectively connected with the gate of the second MOS transistor and the gate of the third MOS transistor, and the output terminal is connected with the gate of the switch circuit The second control terminal is connected; the output terminal of the enabling control circuit is resp...

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PUM

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Abstract

The invention discloses a bidirectional DCDC power conversion circuit, which comprises a full-bridge rectification circuit, a transformer, a first diode, a second diode, a first capacitor, a first inductor and a switching circuit; the first diode, the second diode and a primary side coil of the transformer are arranged to form a clamping network, and the turn-to-turn ratio of two coils on the high-voltage side of the transformer is optimized, so that when the bidirectional power conversion circuit works in the forward direction, the clamping network can effectively suppress the peak voltage of a switching device in the switching circuit and reduce the device type selection difficulty of the switching circuit, and when the bidirectional power conversion circuit works in the reverse direction, the clamping network, the full-bridge phase shift circuit and the transformer jointly form a low-impedance loop and a charging loop, and zero-current soft switching and boosting are realized. Compared with an existing bidirectional power conversion circuit which is an LC topology and cannot achieve the boost function during reverse working, the bidirectional power conversion circuit is higher in adaptability, the problems that a clamping diode has reverse recovery characteristics and is large in heat productivity are solved, and the reliability of the circuit is improved.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a bidirectional DC-DC power conversion circuit. Background technique [0002] With the development of the battery capacity market, there is a wider demand for bidirectional ACDC charging and discharging power supplies. At present, ACDC+DCDC two-part bidirectional switching circuits are mostly used to realize the functions of forward rectification and transformation, and reverse inverter grid connection. Among them, for the existing DCDC part of the conversion circuit, the LLC topology circuit can achieve a wide voltage regulation range and ZVS (ZeroVoltage Switch, zero voltage switch) soft switching characteristics when working in the forward direction, but it cannot be realized by converting to the LC topology when working in the reverse direction. The boost function has certain limitations. And although the traditional PSFB (Phase Shift Full Bridge, phase-shifted full bri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02M3/26H02M3/24H02M1/32
CPCH02M1/32H02M3/24H02M3/26H02M3/33584H02M3/33592Y02B70/10
Inventor 苑士鑫
Owner SHENZHEN INCREASE TECH CO LTD
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