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WE-WPC Slide 18

The resonant converter usually operates at a constant working frequency, which is decisively determined by the resonant frequency of the LC parallel resonant circuit. As soon as a DC voltage is applied to the circuit, it starts to oscillate on its own. This independent oscillation is based on the MOSFETs’ minute component tolerances. Within a fraction of a second, one of the two MOSFETs is slightly more conductive than the other. The positive feedback of the two MOSFET gates and the opposite drain of the other MOSFET gives rise to a 180° phase shift. The two MOSFETs are therefore always driven out of phase and can never conduct simultaneously. The MOSFETs alternately connect both ends of the parallel resonant circuit to ground. This allows the resonant circuit to be periodically recharged with energy.

PTM Published on: 2012-06-20
PTM Updated on: 2016-05-05