Buck-mode constant power control method and circuit of soft switching bidirectional direct-current converter

A bidirectional DC conversion, constant power control technology, applied in the direction of converting DC power input to DC power output, control/regulation systems, output power conversion devices, etc. Turn-on loss and turn-off loss, small size, effect of reducing inductance value

Inactive Publication Date: 2020-05-19
东莞市恒信第三代半导体研究院 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, there is a soft-switching modulation strategy for the four-switch buck-boost converter in the existing technology, but no specific control method for the control system based on efficiency optimization is given.

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  • Buck-mode constant power control method and circuit of soft switching bidirectional direct-current converter
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  • Buck-mode constant power control method and circuit of soft switching bidirectional direct-current converter

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Embodiment Construction

[0023] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] In one embodiment, the present invention provides a buck-mode constant power control method of a soft-switching bidirectional DC converter, which can be applied to regulate such as figure 1 The soft-switching bidirectional DC converter 10 is shown. Wherein, the soft-switching bidirectional DC converter 10 at least includes: a first input bridge arm 110, a second input bridge arm 120, a first output bridge arm 130 and a second output bridge arm 140, wherein the first input bridge arm 110 and the second The two input bridge arms 120 are connected to form an input half bridge, and the first o...

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Abstract

The invention relates to a buck-mode constant power control method and control circuit for a soft switching bidirectional direct-current converter. The soft switching bidirectional direct-current (DC)converter comprises a first input bridge arm, a second input bridge arm, a first output bridge arm and a second output bridge arm. The control method comprises the following steps: when the soft switching bidirectional DC converter is in a buck mode, adjusting the duty ratio of the first output bridge arm according to the difference between the output power of the first output bridge arm and preset power; and when the duty ratio of the first output bridge arm reaches a first preset threshold value, adjusting the duty ratio of a preset phase shift angle, wherein the preset phase shift angle isthe phase shift angle when the trigger pulse of the first input bridge arm is ahead of the trigger pulse of the first output bridge arm. According to the invention, the soft switching bidirectional DC converter can be controlled with the optimal efficiency, and the stability and reliability of the system during operation are improved.

Description

technical field [0001] The invention relates to the technical field of electrical automation, in particular to a method and circuit for controlling constant power in a step-down mode of a soft-switching bidirectional DC converter. Background technique [0002] With the increasing energy crisis, there is an increasing demand for DC power supplies with higher efficiency, higher power density, and wide input and output ranges. In low-current and high-frequency applications, the turn-on and turn-off losses of the switching tube constitute the vast majority of the circuit loss. Reducing this part of the loss is of great significance for further increasing the switching frequency and power density. [0003] In the traditional converter control method, the switching tube is hard-turned-on, and the voltage and current are not zero during the turn-on process, which will cause electromagnetic interference and turn-on loss, and is not suitable for high-frequency, high-efficiency, and h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584H02M1/0058Y02B70/10
Inventor 徐海波李睿韩啸张胜发李锡光阳志超乔良
Owner 东莞市恒信第三代半导体研究院
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