Flyback power supply

Details Flyback power supply Flyback power supply

H - Electricity

02

M

321/29

H02M 3/335 (2006.01)

Patent

CA 1283166

AP-00612 FLYBACK POWER SUPPLY ABSTRACT A flyback power supply (10) is disclosed which includes a sample and hold feedback path. A pulse width modulation circuit (23) provides control signals for a drive device (20) that determines current excitation pulses for a primary winding (17) of a transformer (16). A secondary winding (19) of the transformer is connected to a rectifier circuit (21, 22) and provides a DC voltage signal at an output terminal (12). A selective feedback path (40 - 49) is provided between the output terminal and a sense input terminal (24) of the pulse width modulation circuit. The selective feedback path comprises a sample and hold circuit (40) which provides for effectively coupling the output terminal to the sense input terminal at time during the storage of energy in the transformer, corresponding to an increase in transformer flux, and wherein at other times when the transformer flux is decreasing and energy is being transferred from the transformer to the rectifier circuit the feedback path effectively disconnects the output terminal from the sense input. The sample and hold circuit comprises a series pass transistor (41) and a holding capacitor (42). The series pass transistor is selectively turned on and off in accordance with the control output signal of the pulse width modulation circuit (23) that determines the primary winding current pulses.

520853

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