High dynamic performance fuzzy pid control method for llc resonant converter
A technology of resonant converter and control method, which is applied in the direction of irreversible DC power input conversion to AC power output, control/regulation system, DC power input conversion to DC power output, etc., which can solve the problem of not considering load changes and poor performance , large amount of online calculations, etc., to achieve the effect of improving stability and dynamic performance, widening the input voltage range, and widening the load variation range
Active Publication Date: 2020-05-22
SOUTH CHINA UNIV OF TECH
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However, these controls still have deficiencies: the traditional PID control does not consider the drastic changes of the small-signal model caused by the change of switching frequency and load, and the performance is poor in a wide working range; the adaptive control only adjusts the voltage by switching frequency. Control the gain of the oscillator, and then control without considering the influence of load changes; while the synovial film control is too complicated, the amount of online calculation is large, and it takes up a lot of computing resources
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[0032] The implementation of the present invention will be further described below with reference to the accompanying drawings, but the implementation and protection of the present invention are not limited to this. It should be pointed out that if there are processes that are not specifically described in detail below, those skilled in the art can refer to the prior art. of.
[0033] Such as figure 1 As shown, a schematic diagram of a new type of fuzzy PID control method with high dynamic performance applied to LLC resonant converter, the main steps are as follows:
[0034] (S1) Use the Hall current sensor to measure the load current i of the LLC resonant converter o Sampling, using the voltage division method to sample the output voltage U o， Converted to digital signal through the ADC module of DSP;
[0035] (S2) switching frequency f s And load current i o Respectively through the following linear transformation conversion, the actual domain [x * min ,x * max ] Is mapped to the...
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The invention discloses a fuzzy PID control method with high dynamic performance for an LLC resonant converter. The present invention is based on the traditional PID control, according to the open-loop gain of the LLC resonant converter under different switching frequencies and loads in the open-loop state A vf The change trend of the fuzzy control look-up table is designed, and the switching frequency f s and load current i o As an input variable, adjust the PID proportional coefficient online through query K p , so that the open-loop gain after the compensation link K vf Maintain basic stability. Therefore, under different working conditions, the low-frequency amplitude-frequency characteristics of the LLC resonant converter are basically stable, thereby improving its steady-state and dynamic performance, broadening the working range of the LLC resonant converter, and adjusting parameters by querying, with a small amount of calculation and no need Additional devices.
Description
Technical field [0001] The invention relates to an LLC resonant converter, in particular to a novel fuzzy PID control method with high dynamic performance applied to an LLC resonant converter, and belongs to the technical field of power electronic converters. Background technique [0002] With the popularization of switching power supply technology and the continuous improvement of power supply efficiency requirements, soft switching technology has received more and more attention. Among them, LLC resonant converter, as a wide input range topology that can achieve zero voltage turn-on in the full load range without adding auxiliary circuits, has been widely used and researched. [0003] However, because the low-frequency amplitude-frequency characteristics of the small-signal transfer function of the LLC resonant converter are affected by many factors, especially the switching frequency and load size, it is difficult to obtain a good dynamic response in a wide operating range. The...
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IPC IPC(8): H02M3/335H02M7/48
CPCH02M3/33569H02M7/48H02M7/4815Y02B70/10
Inventor 杜贵平梁光耀赖娜
Owner SOUTH CHINA UNIV OF TECH