COMPLEMENTARY CONVERTER FOR SWITCH MODE POWER SUPPLY

摘要

A complementary converter is a switch mode converter circuit that uses one pulse-width modulation (PWM) controller and one power MOSFET to run a two-stage power-factor-corrected (PFC) power supply. The two-stage power-factor-corrected power supply can include a power-factor-corrected boost converter, and a DC-to-DC converter (either step-up or step-down). The DC-to-DC converter can be, e.g., a Flyback, Forward, Cuk, or Buck Converter. The complementary converter circuit includes a voltage input section that takes a universal VAC input and rectifies the input. Then the PFC boost converter boosts the rectified half-cycle DC to a DC line at a higher voltage. The complementary converter circuit further includes an integrated circuit with the power-factor-correction and PWM switching capabilities to control the converters. The DC-to-DC converter brings the voltage down to an appropriate level for the final load (e.g., LEDs).

主权项

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 second DC-to-DC converter; and a pulse-width modulation (PWM) controller configured to regulate open and closed status of the shared switch.