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A genetic algorithm based efficiency optimization power supply control method

A genetic algorithm and power control technology, applied in the direction of control/regulation system, electrical components, regulating electrical variables, etc., can solve the problems of low LLC efficiency, long time consumption, system failure, etc., and achieve the effect of simple circuit

Active Publication Date: 2018-12-14
SOUTHEAST UNIV
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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.

Method used

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  • A genetic algorithm based efficiency optimization power supply control method
  • A genetic algorithm based efficiency optimization power supply control method
  • A genetic algorithm based efficiency optimization power supply control method

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Embodiment Construction

[0043] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in detail:

[0044] figure 1 is the specific meaning represented by the control parameters T, d, x, y, a, b in the switching waveform. T and d represent the switching period and dead time, respectively, and x, y, a, b represent the magnitude of the phase shift in the switching waveform, respectively.

[0045] figure 2 is the overall block diagram of the system. The control system consists of the front-stage Buck-Boost topology circuit, the rear-stage fixed-frequency LLC voltage regulation topology circuit, sampling circuit, sampling amplification isolation circuit, and a control circuit with a microcontroller as the core. The sampling circuit samples the output voltage V of the fixed-frequency LLC voltage regulating circuit in the rear stage o and output current I o The input voltage V of the pre-stage Buck-Boost topology circuit in and input current I in Then ...

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Abstract

An efficiency-optimized power supply control method based on genetic algorithm is disclosed. The method is based on a control system comprising a Buck-Boost circuit of a preceding stage, a LLC voltageregulating circuit of a subsequent stage, a sampling circuit, a sampling amplification isolation circuit, and a control circuit with a microcontroller as a control core . Samples are taken to obtainthe evaluation factors of the system efficiency, including the output voltage Vo and the output current Io of the subsequent stage, and the input voltage Vin and the input current Iine of the preceding stage. The genetic algorithm module evaluates the influence of the control parameters on the efficiency by using different calculation parameters k, and finally iterates to obtain the calculation parameter k which is most suitable for the system, so that the system efficiency can be optimized. A look-up table (LUT) is used to record the switching dead time of the upper and lower transistors in the LLC topology circuit corresponding to the load and output voltage when the system load changes. This allows for direct lookup and reading of the corresponding dead time when the load is switched.

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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158H02M3/335
CPCH02M3/1582H02M3/33592
Inventor 钱钦松谢明枫宋慧滨孙伟锋陆生礼时龙兴
Owner SOUTHEAST UNIV
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