Slope compensation method for voltage-type hysteresis loop control switching converter and device thereof

Abstract

The invention relates to a slope compensation method for a voltage-type hysteresis loop control switching converter and a device thereof. The method disclosed by the invention comprises the following steps: on the basis of the voltage-type hysteresis loop control, introducing an inductive current signal serving as a slope compensation of the voltage-type hysteresis loop control; subtracting the slope compensation from an upper limit reference voltage to obtain an upper-limit voltage; adding a lower-limit reference voltage with the slope compensation to obtain a lower-limit voltage; and according to the comparison condition of an output voltage and the upper and lower limit voltages, controlling the on / off of a main circuit switching device by a controller. The on / off time can be changed according to the comparison condition so as to implement the slope compensation control of the voltage-type hysteresis loop control switching converter. Due to the adoption of the slope compensation method, the dependence of the voltage-type hysteresis loop control switching converter on the characteristic of an output capacitor is reduced, the influence of a phase of a phase lag inductive current of the output voltage on the voltage-type hysteresis loop control is eliminated and the output voltage is effectively controlled in upper and lower limit voltage loops, so that the steady accuracy of the voltage-type hysteresis loop control is improved.

Description

technical field [0001] The invention relates to a slope compensation control method and a device thereof for a voltage type hysteresis control switching power converter. Background technique [0002] With the rapid development of power electronics technology, the relationship between power electronic equipment and people's work and life is becoming increasingly close, and electronic equipment is inseparable from a reliable power supply. Compared with the traditional linear regulated power supply, the switching power supply has the advantages of high efficiency and small size, which makes the switching power supply technology gradually become a hot spot in people's application and research. The rapid development of power electronic devices provides a large development space for switching power supplies, making them develop in the direction of small size, light weight, high efficiency, and high power density, which has attracted widespread attention from the industry and has ...

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Problems solved by technology

In general, in order to improve the working life of the switching power supply, the output filter capacitor often uses non-aluminum electrolytic capacitors, such as ceramic capacitors, whose equivalent series resistance value is small, which cannot overcome the problem caused by the output voltage ripple phase lagging behind the inductor current phase. The output voltage exceeds the upper and lower limit voltage loops, resulting in system out of control, poor steady-state accuracy, and large output voltage and inductor current ripple, thus limiting the integration and promotion of control circuits to a large extent

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