Switch power control method with optimized dynamic response

Abstract

The invention discloses a switch power control method with optimized dynamic response. The method is based on a control system formed by control circuits taking a Buck step-down topological circuit, a fixed frequency LLC voltage regulating circuit, an output voltage sampling circuit and a microcontroller as control cores. Evaluation factors about dynamic response effects in a system adjusting process include overshoot in adjusting process and stabilizing time of system output voltage; a multi-objective optimization algorithm can evaluate the performance of the PID control module according to the overshoot and the stabilizing time of the system output voltage; through final iteration, the overshoot and the stabilizing time of the PID control module in the control process can reach the optimal parameter; thus the dynamic response effect of the system reaches the best.

Description

technical field [0001] The invention relates to a control method of a switching power supply, in particular to a dynamic response optimization switching power supply control method based on a multi-objective optimization algorithm. Background technique [0002] In the field of switching power supply, dynamic response is an important index to evaluate the performance of switching power supply. Improving the control method of digital power supply can improve the dynamic response capability of switching power supply. The current control methods mainly consist of three digital control methods. The first is the control method based on the linear compensator, which uses the flexibility of digital control to adjust the appropriate control parameters or the form of the compensator to make the system reach a higher level. bandwidth, while having sufficient stability margin. This control method adopts a fixed switching frequency, which can reduce noise problems, realize rapid voltage...

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Problems solved by technology

However, in practical applications, the above schemes are often subject to various restrictions. For example, the voltage mode hysteresis control cannot be directly applied to the Boost converter, and it will interact with the voltage regulation mode in the Buck converter. Mode hysteresis controllers can avoid these problems, but they are more difficult in practical applications

[0005] The above control modes need to design the control system at the beginning of the power supply design to adapt to various situations that the system may face, which often involves the derivation of the load formula. In addition, in the high-frequency switching power supply, the derivation of the formula is related to the actual work of the system. The situation often deviates, which leads to the deviation of the system settings and the failure of the system

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