LLC resonant converter and control method
A technology of a resonant converter and a control method, which is applied in the control/regulation system, the conversion of AC power input to DC power output, and the conversion of DC power input to DC power output, etc., can solve the problems of large device stress and inconvenient converter design. , to achieve the effect of small frequency conversion range, excellent comprehensive performance, and reduced loss
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[0028] Such as image 3 As shown, the LLC resonant converter of this embodiment includes an inverter circuit 10, an LLC resonant cavity 20, a transformer T, and a rectifier network 30 that are sequentially connected from input to output. In the figure, Vin is the input power of the converter, Ro is the output load R of the converter 0 .
[0029] The inverter circuit 10 is a full-bridge inverter circuit composed of a switching tube S1, a switching tube S2, a switching tube S3, and a switching tube S4. The LLC resonant cavity 20 includes a resonant inductance Lr, an excitation inductance Lm and a resonant capacitor Cr, and is additionally provided with a bidirectional switch composed of a switch tube S5 and a switch tube S6. The rectifier network 30 is a full-bridge rectifier circuit composed of 4 diodes D1-D4 in parallel to output a filter capacitor C 0 constitute.
[0030] The drain of the switch S1 is connected to the drain of the switch S2 and the positive terminal of the input ...
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