Method for improving switching control precision of switching power supply
A technology of control precision and switching power supply, which is applied to conversion equipment, electrical components, and output power conversion devices without intermediate conversion to AC. It can solve the problems of low output voltage accuracy and large output voltage steady-state error, and achieve faster speed. The effect of response speed, reducing output voltage ripple and reducing steady-state error
Inactive Publication Date: 2014-08-06
XIAN UNIV OF TECH
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[0003] The purpose of the present invention is to provide a method for improving switching control accuracy of switching power supply to overcome the problems of low output voltage accuracy and large output voltage steady-state error in the original switching control method
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[0024] 1. Description of the controlled object
[0025] The controlled object Boost converter circuit such as figure 1 As shown, the Boost power electronic converter includes an input DC power supply E, an inductor L, a diode D, a switch S, a capacitor C and a load R; the positive pole of the input DC power supply E is respectively connected to one end of the switch S and the positive pole of the diode D through the inductor L, The other end of the switch S is connected to the negative pole of the input DC power supply E, the negative pole of the diode D is respectively connected to the positive pole of the capacitor C and one end of the load R, and the negative pole of the capacitor C and the other end of the load R are connected to the negative pole of the input DC power supply E.
[0026] With the different circuits of switching state and internal state, the Boost converter can be divided into 3 working states, and its dynamic equation is as follows:
[0027] ...
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The invention provides a method for improving switching control accuracy of switching power supply. First, measure the input voltage Vin of the input DC power supply, the inductance current iL of the inductor, the output voltage vo and the current iR of the load; then calculate the resistance of the load: R=vo / iR ; Then calculate the average current IL of the inductance L, the converter switch S is controlled as follows: when iL / IL<vo / Vo, the switch is off; when iL / IL>vo / Vo, the switch is on. The method of the invention can reduce the steady-state error of the output voltage of the converter working in the current continuous working state under the condition of internal resistance, and at the same time speed up the response speed, reduce the output voltage ripple, and reduce the steady-state error of the output voltage of the switching power supply , improve switching power switching control accuracy.
Description
technical field [0001] The invention belongs to the technical field of switching control methods for switching power supplies, and in particular relates to a method for improving switching control precision of switching power supplies. Background technique [0002] Switching power supply is a widely used power conversion device. The topology of switching power supply changes with the state of the switch, showing typical hybrid system characteristics, that is, continuous state evolution and discrete switching of the switch in a specific state. composed system. For such a hybrid system, the model is established by hybrid automata, and the switching control law is obtained by analyzing the change of the circuit state variables to realize the switching control of the switching power supply, which can avoid the approximation steps of the traditional analysis and design methods, and simplify the analysis and design. Aiming at the problem of steady-state error in a traditional con...
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IPC IPC(8): H02M3/10H02M1/14
Inventor 李洁郑婷任海鹏
Owner XIAN UNIV OF TECH