Patent ID: 9746812
Date: 2017-08-29
CPC Classifications: G03G,H02M

Claim:
1. A power supply unit, comprising: a power factor correction circuit configured to convert a first alternating-current signal into a direct-current signal; a synchronizing signal generator configured to generate, based on the first alternating-current signal, a synchronizing signal that is in synchronization with the first alternating-current signal; and an alternating-current signal generator including a switching section and a control circuit, and configured to convert, with the switching section, the direct-current signal into a second alternating-current signal, and supply the second alternating-current signal to a load, the switching section being configured to perform, based on the synchronizing signal, a switching operation, the control circuit being configured to vary an effective voltage value of the second alternating-current signal by controlling an operation of the switching section, the effective voltage value of the second alternating-current signal being greater than zero volts.