Patent ID: 7986131

Claim:
A booster power supply circuit comprising: a booster which boosts an input voltage to output a boosted voltage for applying said boosted voltage to a first smoothing capacitor; and a controller which controls a transfer destination and an amount of transfer of a charge in the first smoothing capacitor at a transition from an operation mode to a standby mode, a first switching element which outputs said boosted voltage to a node coupled to said first smoothing capacitor; a second switching element which connects said node with the input of said booster; and a third switching element which connects said node to a first power supply via a resistance element, wherein the controller turns the first switching element to an OFF state, the second switching element to an OFF state and the third switching element to an ON state at a first timing transitioning from the operation mode to the standby mode, and the second switching element to an ON state and the third switching element to an OFF state at a second timing, the second timing being a predetermined time passed from the first timing.