POWER SOURCE OR MAINS DEVICE FOR CONVERTING A MAINS AC VOLTAGE TO A HIGH-FREQUENCY AC OUTPUT VOLTAGE WITH SUPPRESSED NET HUMAN

摘要

The converter comprises a rectifier 3, a smoothing circuit 4 with inductor means 42 and a smoothing capacitor 41, and an inverter 5 having switching means 50, 51 for switching the input dc voltage from the rectifier to provide high frequency ac voltage output with a reduced ripple. The inductor means receives electromagnetic energy from the current therein when the switching means 50 is switched on and the electromagnetic energy is fed to the smoothing capacitor to charge the same when the switching means is switched off, the resulting voltage developed across the capacitor being applied to the inverter input. This enables the inductor means to be reduced to a smaller value while allowing it to retain a high power factor, and it can be readily incorporated in the converter without requiring any additional switching means and without undue increase in the component costs. IMAGE