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All-digital soft start control method for isolated Boost full-bridge converter

A full-bridge converter, all-digital technology, used in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve the problem of easy saturation, circuit failure and component damage of isolated boost full-bridge converters , PWM drive control signal is difficult to be strictly symmetrical, etc.

Pending Publication Date: 2022-01-11
FUJIAN NEBULA ELECTRONICS CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, due to the use of analog circuits, it is difficult to achieve strict symmetry of the PWM drive control signal, and the isolated boost full-bridge converter is also prone to saturation during startup, which may easily cause circuit failure and component damage

Method used

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  • All-digital soft start control method for isolated Boost full-bridge converter
  • All-digital soft start control method for isolated Boost full-bridge converter
  • All-digital soft start control method for isolated Boost full-bridge converter

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Embodiment Construction

[0043]The general idea of ​​the technical solutions in the embodiments of the present application is as follows: by using the PWM drive control signal whose duty cycle D is continuously increasing, the on-off of each switch is controlled at the start-up stage (Buck mode and Boost mode), and when entering the Buck mode , based on the duty cycle D, each switch is controlled to be turned on at the same time, and then turned off at the same time, so that the energy stored in the boost inductor L is released to the load resistor R through the auxiliary circuit; when the duty cycle D is greater than 0.5, the Boost mode is entered. When the energy stored in the boost inductor L has been released, the soft start of the isolated boost full-bridge converter can be realized, thereby improving the reliability of the circuit operation.

[0044] Please refer to Figure 1 to Figure 9 As shown, a preferred embodiment of an all-digital soft-start control method for an isolated Boost full-bridg...

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Abstract

The invention provides an all-digital soft start control method of an isolated Boost full-bridge converter in the technical field of power electronic switching power supplies. The method comprises the following steps: S10, outputting a PWM driving control signal with a continuously increased duty ratio D to a primary side bridge arm; S20, enabling the converter to enter a Buck mode, controlling on-off of each switching tube based on the duty ratio D, and releasing energy of a boost inductor L by using an auxiliary circuit; S30, when the duty ratio D is greater than 0.5, entering a Boost mode, controlling the on-off of each switching tube based on the duty ratio D, and controlling the boost operation of the output voltage; and S40, acquiring output voltage V1 at two ends of the load resistor R, interrupting the PWM driving control signal based on the output voltage V1, the duty ratio D and the target voltage V2, and further executing the starting subprogram to finish soft starting of the converter. The method has the advantages that: soft start of the isolated boost full-bridge converter is achieved based on the digital controller, the impact current of an inductor in the starting process is reduced, and then the reliability of circuit operation is greatly improved.

Description

technical field [0001] The invention relates to the technical field of power electronic switching power supplies, in particular to an all-digital soft-start control method for an isolated Boost full-bridge converter. Background technique [0002] The isolated boost (Boost) full-bridge converter is a DC-DC conversion topology that can achieve both a large boost ratio and electrical isolation. It has broad application prospects in aspects such as electric vehicles, auxiliary energy systems for electric vehicles, maximum power tracking systems for solar cells, and microgrid energy storage. Compared with other topology converters, the isolated boost full-bridge converter has overcurrent and short-circuit protection capabilities, so it is widely used in power electronic products such as switching power supplies, but the disadvantage is that the isolated boost full-bridge converter needs to be pre-established when starting. The output voltage can work normally in boost mode (Boos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/36H02M3/335H02M1/32
CPCH02M1/36H02M3/3353H02M1/32
Inventor 刘作斌杨国陈志坚
Owner FUJIAN NEBULA ELECTRONICS CO LTD
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