Control method and control system of chopper converter

Abstract

The invention provides a control method and a control system of a chopper converter, the chopper converter comprises a Buck converter and a Boost converter which are connected in series, the adopted control method comprises the following steps: sampling an output voltage value and an output current value of the Buck converter, carrying out closed-loop regulation based on the collected output voltage value and the output current value, and controlling the output voltage value and the output current value of the Buck converter according to the closed-loop regulation. The control duty ratio of the Buck converter is output, and the control duty ratio of the Boost converter is calculated based on the control duty ratio of the Buck converter so as to control the output of the chopper converter; the beneficial effects of the invention are that a traditional four-order control system is changed into a two-order control system, the difficulty of parameter adjustment control is reduced, the calculation and configuration of the control margin are controlled, the response speed of the system is improved, the front-stage BOOST converter and the rear-stage BUCK converter are subjected to synchronous closed-loop control, and the output ripple and EMI influence are effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a control method and a control system of a chopper converter. Background technique [0002] Chopper converters are widely used in the power electronics industry, and Buck converters and Boost converters are the most widely used. Single-stage Buck converter or Boost converter can only be used as step-down or step-up. For applications where the input voltage and output voltage range overlap, a Buck_Boost step-down converter or two-stage Buck and Boost converters in series are required. However, due to the problems of opposite output polarity, complex inductance design, and intermittent input and output currents, the former has fewer practical engineering applications. The latter uses Boost+Buck converters in series, which effectively avoids the above problems, and is widely used in some fields with high requirements for ripple and electromagnetic compatibilit...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide a control method and control system for a chopper converter, which aims to solve the problems of complex control algorithms, difficult parameter adjustment, and dynamic response problems in chopper converters formed by series connection of traditional Buck and Boost converters. Slow, occupying high software and hardware resources of the control system

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