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Phase-shifted full-bridge circuit and its control method

A phase-shifting full-bridge and control method technology, applied in the field of DC/DC, can solve the problems that the phase-shifting full-bridge circuit cannot realize soft switching, and can not realize soft switching, so as to reduce system cost, improve efficiency, and reduce system volume Effect

Active Publication Date: 2011-12-21
UNITED AUTOMOTIVE ELECTRONICS SYST
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Problems solved by technology

However, the current flowing through the resonant inductor L1 is determined by the load, which determines that the commonly used phase-shifted full-bridge circuit cannot achieve soft switching in the full load range, that is, the phase-shifted full-bridge circuit under light load (small load) conditions Bridge circuits cannot achieve soft switching

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  • Phase-shifted full-bridge circuit and its control method
  • Phase-shifted full-bridge circuit and its control method
  • Phase-shifted full-bridge circuit and its control method

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Embodiment Construction

[0053] The control method of the phase-shifted full-bridge circuit provided by the present invention is as follows: Figure 6 As shown, the control method divides a working cycle of the phase-shifted full-bridge circuit into the following 10 stages. Among them, OA, OB, OC, OD, OE, and OF are the external gate voltages of the MOS transistors Q1-Q6, V_TX is the primary voltage of the transformer TX, and I_TX is the primary current of the transformer TX.

[0054] Phase 1: OA, OD, OF are high level, OB, OC, OE are low level, MOS transistors Q1, Q4, Q6 are turned on, V_TX is positive, and I_TX increases.

[0055] Stage 2: OD becomes low level, MOS transistor Q4 is turned off, the leakage inductance of the primary side of the transformer TX and the parasitic capacitance between the drain and source of MOS transistor Q3, and the parasitic capacitance between the drain and source of Q4 generate resonance, and the MOS transistor Q4 The voltage between the drain and the source starts t...

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Abstract

The invention discloses a control method for a phase-shifted full-bridge circuit. A duty cycle of the phase-shifted full-bridge circuit is divided into ten stages, wherein OA, OB, OC, OD, OE and OF are external gate voltages of metal oxide semiconductor (MOS) transistors Q1 to Q6. In the method, the simultaneous buildup of the OE and the OC is changed into sequential buildup, and the simultaneous buildup of the OF and the OD is changed into sequential buildup, thereby making the soft switching of the phase-shifted full-bridge circuit possible under light load condition. The invention also discloses the phase-shifted full-bridge circuit to which the control method is applied. The primary side of a transformer is required to form a full-bridge structure, and the secondary side of the transformer is required to form a synchronous rectifying structure. The circuit can save a resonance inductor and a clamping diode on the primary side of the transformer, thereby reducing system cost and system volume and improving system efficiency.

Description

technical field [0001] The present invention relates to a DC / DC (DC-DC converter), in particular to a soft switching phase-shifting full-bridge circuit. Background technique [0002] In electric vehicles and hybrid vehicles, automotive DC / DC is used to convert the voltage of the high-voltage battery into a low voltage, thereby supplying power to low-voltage loads and charging the low-voltage battery at the same time. In order to improve the efficiency of DC / DC, reduce the volume and reduce the cost, the soft switching technology is widely used. Automotive DC / DC usually uses a phase-shifted full-bridge circuit to achieve soft switching. [0003] see figure 1 , which is an existing phase-shifted full-bridge circuit, including: [0004] a transformer TX; [0005] A leading bridge arm, composed of MOS transistors Q1 and Q2 connected in series; [0006] A lagging bridge arm is composed of MOS transistors Q3 and Q4 connected in series, and the connection node D of these two M...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/338
CPCY02B70/1433Y02B70/10
Inventor 付登萌韩卫军孙辉
Owner UNITED AUTOMOTIVE ELECTRONICS SYST
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