Wireless Battery Chargers Operating at Multiple Switching Frequencies with Improved Performance

The operation of wireless battery chargers at multiple switching frequencies may lead to a noticeable suppression conducted and radiated electromagnetic interference (EMI) the cost decreased efficiency (mainly lower load resistances) increased peak root mean square values currents power components charger. Moreover, reduction in EMI is only moderate (<8.3 dB). Therefore, novel approach based on modified resonant circuits control technique obtain better without significantly compromising other performance characteristics charger proposed validated by using simulations experiments. It shown this paper that operating with for improvement has more effective implementation four-switching frequency spread-spectrum all resistances, RMS higher constant current mode beginning voltage (at than conventional frequencies.