Phase-shifted full-bridge converter, soft start method and soft start device thereof

A technology of phase-shifting full bridge and converter, which is applied in the direction of output power conversion device, conversion of DC power input to DC power output, instruments, etc., and can solve problems such as inability to meet customer needs

Active Publication Date: 2019-11-01
SHANGHAI KOSTAL HUAYANG AUTOMOTIVE ELECTRIC +1
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Problems solved by technology

[0005] Therefore, how to avoid being unable to meet customer needs due to the traditional soft start method is a technical problem that those skilled in the art need to solve at present

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  • Phase-shifted full-bridge converter, soft start method and soft start device thereof
  • Phase-shifted full-bridge converter, soft start method and soft start device thereof
  • Phase-shifted full-bridge converter, soft start method and soft start device thereof

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Embodiment Construction

[0047] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0048] The core of the present invention is to provide a soft-start method for a phase-shifted full-bridge converter. The soft-start method does not need to pre-set the start-up type, and can be applied to any type of load, no matter what kind of load the phase-shifted full-bridge converter carries. Both can have a relatively smooth start waveform, and can reach the rated output value within a specified time; the soft start method can greatly improve the versat...

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Abstract

The invention discloses a soft start method of a phase-shifted full-bridge converter. The phase-shifted full-bridge converter comprises a primary side full-bridge circuit, a secondary side synchronousrectification circuit and an active clamping circuit. The soft start method comprises the following steps of acquiring a minimum phase shift angle; calculating pWM waves corresponding to the three circuits according to the minimum phase shift angle, and setting each PWM wave to a corresponding PWM channel; obtaining a new phase shift angle according to a preset rule; and calculating PWM waves corresponding to the three circuits respectively according to the new phase shift angle, setting each PWM wave to a corresponding PWM channel, and then executing the step of obtaining the new phase shiftangle until a soft start ending condition is met to end soft start. The invention further discloses a soft start device of the phase-shifted full-bridge converter and the phase-shifted full-bridge converter comprising the soft start method and the soft start device. The soft start method can realize smooth start of the converter and is suitable for different types of loads, so that the universality of the converter can be improved. The competitiveness of the converter is enhanced.

Description

technical field [0001] The invention relates to the technical field of vehicle-mounted converters, in particular to a soft start method for a phase-shifted full-bridge converter. The invention also relates to a soft start device for a phase-shifted full-bridge converter and a phase-shifted full-bridge converter with the soft start method and device. Background technique [0002] The on-board DCDC is responsible for energy conversion between the on-board high-voltage battery and the low-voltage battery. The phase-shifted full bridge is widely used in the on-board DCDC converter due to its high efficiency, low cost, simple design and electrical isolation. It can be used not only to charge constant voltage loads such as batteries, but also to directly supply power to various constant resistance or constant current loads. [0003] When the DCDC converter is started, if it is not dealt with, there will be a large impulse voltage and impulse current, which will cause two problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335H02M1/32
CPCH02M1/32H02M1/36H02M3/3353Y02B70/10
Inventor 王峰单洁炜廖政伟徐金良
Owner SHANGHAI KOSTAL HUAYANG AUTOMOTIVE ELECTRIC
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