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WIDE GAIN CONTROL METHOD FOR VARIABLE TOPOLOGY LLC RESONANT CONVERTER
WIDE GAIN CONTROL METHOD FOR VARIABLE TOPOLOGY LLC RESONANT CONVERTER
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机译：可变拓扑LLC谐振转换器的宽增益控制方法
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摘要
Disclosed is a wide gain control method for a variable topology LLC resonant converter, the method being applied to a variable topology LLC resonant converter composed of an inverter circuit, an LLC resonant cavity, a transformer and a secondary rectifying and filtering output circuit. In the present invention, the range of an input voltage is divided into a low voltage section, a medium voltage section and a high voltage section respectively corresponding to three different modals; the variable topology LLC resonant converter uses variable-frequency PFM control of an FBLLC structure in the low voltage section of the input voltage, and an output voltage gain is changed by means of changing a switch frequency; the variable topology LLC resonant converter uses fixed-frequency PWM control of the FBLLC structure in the medium voltage section of the input voltage, and the output voltage gain is changed by means of changing a duty ratio of a switch tube (S1) of the inverter circuit; and the variable topology LLC resonant converter uses fixed-frequency PWM control of an HBLLC structure in the high voltage section of the input voltage, and the output voltage gain is changed by means of changing the duty ratio of the switch tube (S1) of the inverter circuit.
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