Patent ID: 6271712
Filing Date: 2001-08-07
Classification: H02M,Y02B

Abstract:
A synchronous rectifier coupled to receive an input signal and providing a charge signal to maintain an operating signal at a predetermined level, the synchronous rectifier comprising:a bias generator including,(a) a first comparator having a first input coupled to receive the operating signal, a second input coupled to receive a reference signal indicative of the predetermined level, a power supply input coupled to receive the operating signal, and an output coupled to provide a charge control signal when the operating signal is below the predetermined level; and(b) a current switch having a control input coupled to receive the charge control signal and an output coupled to provide the charge signal in response to the charge control signal when the input signal is above the operating signal; anda polarity detection circuit having a power supply input coupled to receive the operating signal, an input coupled to receive the input signal and an output coupled to provide a drive signal in response to a polarity of the input signal.