Patent ID: 9699842
Date: 2017-07-04
CPC Classifications: H02M,H05B,Y02B

Claim:
1. A power supply device, comprising: a rectifier configured to convert an alternative current (AC) into a direct current (DC); a first DC-to-DC boost converter configured to receive a first DC voltage from the rectifier and to convert the first DC voltage into a second DC voltage higher than the first DC voltage; a second DC-to-DC converter configured to receive the second DC voltage from the first DC-to-DC boost converter and to convert the second DC voltage into a third DC voltage appropriate for a load; a shared switch, wherein both the first DC-to-DC boost converter and the second DC-to-DC converter use the shared switch to control duty cycles of the first DC-to-DC boost converter and the second DC-to-DC converter; and a pulse-width modulation (PWM) controller configured to regulate open and closed status of the shared switch.