Fast-response filtering backstepping control method for switching power supply buck converter
A technology of switching power supply and backstep control, which is applied in the direction of adjusting electrical variables, control/regulation systems, and converting DC power input to DC power output, etc., and can solve problems such as system instability and slow response speed of output voltage
Active Publication Date: 2020-10-27
YANTAI DONGFANG WISDOM ELECTRIC +1
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[0004] The present invention proposes a fast-response filtering backstepping control method for a switching power supply Buck converter, the purpose of which is to solve the problems of slow response speed of the output voltage of the Buck converter under backstepping control and system instability caused by the differential term in the controller
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[0031] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0032] A fast-response filtering backstepping control method for a switching power supply Buck converter, such as figure 1 and 2 , the steps include:
[0033] Step 1: Obtain Buck converter component parameters and input voltage V in , measure the output voltage V o and inductor current i L , to establish the state-space average model of the Buck converter:
[0034]
[0035] Among them, L is the filter inductance, C is the DC side capacitor, R is the load resistance, and u is the duty cycle of the controllable switch; is the disturbance quantity, and satisfies ρ is a definite constant.
[0036] Step 2: According to the measured output voltage V o and output voltage reference Design the voltage loop backstepping controller and determine the virtual control quantity
[0037] According to the recursive design concept of backstepping method...
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The invention discloses a fast response filtering backstepping control method of a switching power supply Buck converter. The method comprises the steps of measuring output voltage and inductive current, determining virtual control quantity, performing a Levent filtering link, and determining a controllable switch duty ratio. According to the control method provided by the invention, a Levent filter is introduced in a backstepping recursion process; therefore, the differential of the virtual control quantity is avoided, the safe and stable operation of the switching power supply is ensured, the calculation burden is reduced, and in order to realize the finite time stability of a closed-loop system of the converter, a fractional power term is added in the designed virtual control quantity and the controllable switch duty ratio, so that the output voltage response speed is increased, and the system control performance is improved.
Description
technical field [0001] The invention relates to a control method for a DC-DC converter, in particular to a fast-response filtering backstepping control method for a switching power supply Buck converter. Background technique [0002] Due to its advantages of high conversion efficiency and small size, switching power supply is widely used in power electronic equipment. The Buck converter is the core component of the switching power supply. Researching the high-performance control method of the Buck converter is a key way to improve the dynamic response speed and control accuracy of the switching power supply. But the Buck converter is a typical nonlinear system, and the PI control based on the linear model is difficult to obtain a good control effect. Therefore, studying the high-performance nonlinear control strategy of Buck converter is an important research direction at present. [0003] As a new type of nonlinear control method, the backstepping method uses virtual cont...
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IPC IPC(8): H02M3/156H02M1/14
CPCH02M1/14H02M3/1563
Inventor 牛浩孙国栋张加海王贵现韩冬军马建坤王文浩许芹马云岗慕健李鹏单曌国张金刚周强刘春王辉昱刘良涛
Owner YANTAI DONGFANG WISDOM ELECTRIC