DC boost converter control method

Abstract

The invention provides a DC boost converter control method. The control method comprises the following steps: input voltage, intermediate voltage, output voltage and current flowing through an inductor are detected; according to the numerical value of the intermediate voltage and the numerical value of the output voltage, expected current is calculated; according to the numerical value of the input voltage, the numerical value of the current flowing through the inductor and the numerical value of the expected current, the duty cycle of a power transistor is calculated; and according to the duty cycle of the power transistor, on or off of the power transistor is controlled. the DC boost converter control method has the advantages that a double-closed loop control structure is adopted, voltage closed loop control is added to the existing current closed loop, adaptively-adjusted PID control with a weight coefficient is used to realize the adaptive and self-organizing ability of the controller, and stable output of voltage is ensured; and an integral control unit with fast error convergence and strong disturbance robustness is adopted at the same time, and quick and stable tracking onthe expected current by the output current is realized.

Description

technical field [0001] The present invention relates to a control method, in particular to a control method of a DC boost converter. Background technique [0002] A fuel cell is a power generation device that directly converts the chemical energy of fuel and oxidant into electrical energy through an electrochemical reaction. It has the advantages of high power generation efficiency and low environmental pollution. However, because the output voltage of the fuel cell varies in a large range, it is difficult to directly match the input end of the power motor controller. In order to make up for the lack of output characteristics of the fuel cell, a DC boost converter needs to be connected between the fuel cell and the input end of the motor controller to adjust the output voltage and output power of the fuel cell to ensure the fuel cell works stably. However, during the driving process of the vehicle, many external factors, such as road conditions and vehicle braking, will hav...

AI Technical Summary

Problems solved by technology

[0003] Existing DC boost converters generally use technology based on single current PI closed-loop regulation to ensure a stable and smooth output current of the DC boost converter, but the disadvantage of these DC boost converters based on current PI regulation is that the fuel cell output When the voltage fluctuation on the bus is large, it cannot respond quickly, and it cannot suppress the fluctuation of output voltage and current, so as to ensure the stable output of the DC boost converter

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