An efficiency-optimized power supply control method based on genetic algorithm

Abstract

An efficiency-optimized power supply control method based on a genetic algorithm. The method is based on a control system consisting of a front-stage buck-boost circuit, a rear-stage fixed-frequency LLC voltage regulating circuit, a sampling circuit, a sampling amplification isolation circuit, and a control circuit using a micro-controller as a control core. Sampling is performed to obtain efficiency-related evaluation factors during a system adjustment process, the factors comprising an output voltage Vo and an output current Io of the rear stage, and an input voltage Vin and an input current Iin of the front stage. A genetic algorithm module performs iterative computation according to an evaluation of the impact of control parameters, calculated by using different computation parameters k, on efficiency to obtain the computation parameter k best fitting the system, thereby optimizing operational efficiency of the system. When there is a change in a load of the system, the system utilizes a look-up table (LUT) to record a switch dead time of an upper and lower transistor of an LLC topology circuit corresponding to the load and an output voltage, such that a corresponding dead time can be directly looked up and read when the load is changed.

Description

technical field [0001] The invention relates to the control of a switching power supply, in particular to an efficiency-optimized power supply control method based on a genetic algorithm. Background technique [0002] In the field of switching power supplies, two-stage converters are gradually attracting research interest. Due to the simple circuit structure and high working efficiency of LLC, it has attracted people's research interest. But one problem with the LLC topology is that the control process is complicated. So the structure of the two-stage converter has also become a research hotspot. The pre-stage circuit usually adopts a simple and easy-to-control topology, and the post-stage circuit adopts an LLC structure to achieve high efficiency. When the Buck-Boost topology is used in the front-end circuit, its control is usually more complicated, and because the actual value of each component of the circuit often has errors from the nominal value, a control method is ...

AI Technical Summary

Problems solved by technology

The calculation of the traditional method usually takes a long time. During this period of time, the efficiency of LLC is low, and the loss of MOS tube is large, which may cause system failure.

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