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Converter soft start control circuit and control method applicable to analog control system

A technology of analog control and control circuit, which is applied in the direction of electrical components, output power conversion devices, etc., to achieve the effect of structure simplification

Inactive Publication Date: 2017-02-22
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

When the new input phase is merged into the original working phase and works in parallel, there are the same problems as under the battery load condition

Method used

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  • Converter soft start control circuit and control method applicable to analog control system
  • Converter soft start control circuit and control method applicable to analog control system
  • Converter soft start control circuit and control method applicable to analog control system

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Embodiment Construction

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0030] In commonly used cases, the battery-type load is a typical application that can be used as a voltage source load. The synchronous rectification bidirectional Buck converter can also be used as a typical topology for bidirectional converter applications. The following analysis will not specifically distinguish between converters Whether to work in bidirectional mode.

[0031] Such as figure 1 As shown, the main functions of several parts of the control circuit are as follows:

[0032] Analog strobe switch: used to strobe the signal ...

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Abstract

The invention discloses a converter soft start control circuit and a control method applicable to an analog control system. A synchronous rectification Buck converter is a common bidirectional DC-DC conversion circuit topology which can realize bidirectional flow of energy. In a battery charge / discharge occasion, a relatively great start current spike is caused by adopting the traditional soft start scheme with slowly spreading duty cycle or when the inductive current in a rated steady state works in a light-load discontinuous mode after the start. In the invention, with the existing closed-loop PID regulator of a converter, the duty cycle is preset at a given duty cycle in a closed-loop manner before start. At the start moment, closed-loop start is carried out with the preset duty cycle, and great current shock is avoided while quick dynamic response of the start process can be realized to accelerate the start process. The invention can remarkably reduce the current shock in start and also is applicable to the occasions of multiple phase shedding start control of battery loads, voltage source type loads, resistive loads and converters.

Description

technical field [0001] The invention relates to a soft start control circuit and a control method of a converter suitable for an analog control system, and belongs to the technical field of power electronic converters. Background technique [0002] The synchronous rectification bidirectional Buck converter used in battery charging and discharging is a common topology. Based on the traditional Buck converter, the rectifier diode is replaced with a synchronous rectifier tube, which can reduce the loss caused by the voltage drop of the diode, and also At the same time, the two-way flow of energy can be realized. The output terminal of the converter is a battery-type load. Compared with the traditional resistive load, it has the following characteristics and differences: 1. When the converter starts, the output voltage of the resistive load is zero, while the battery-type load has a battery The voltage is used as a support, and the output voltage is not zero; 2. In the bidirect...

Claims

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Application Information

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IPC IPC(8): H02M1/36
CPCH02M1/36H02M1/0025
Inventor 刘硕张方华孟无忌任仁任永宏
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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