Switched mode power supply with start-up control

Details Switched mode power supply with start-up control Switched mode power supply with start-up control

1988-09-28

1989-09-05

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 21, 363 56, 363 97, H02M 3335

Patent

active

048644854

ABSTRACT:
In a switched mode power supply, an output switch is coupled to the primary winding of a transformer and to an input supply voltage derived from the AC mains voltage. A driver stage is coupled to the output switch and to a switched control voltage for producing on-off switching of the output switch between conduction and cutoff to generate a pulse voltage in a secondary winding of the transformer. A supply circuit including a rectifier is coupled to the pulse voltage for generating an operating voltage. A control circuit, responsive to the feedback of the output voltage, modulates the control voltage in a manner that varies the on-off switching of the output switch to stabilize the operating voltage. A bias voltage, derived from the AC mains voltage, and available during a startup interval of the power supply, is coupled to the driver stage during the startup interval. The bias voltage inhibits conduction of the output switch until sufficient time has elapsed after initiation of startup to enable the control circuit to generate a control voltage that is adequate to safely produce the on-off switching of the output switch.

REFERENCES:
patent: 4063307 (1977-12-01), Stephens
patent: 4459651 (1984-07-01), Fenter
patent: 4586120 (1986-04-01), Malik et al.
patent: 4692852 (1987-09-01), Hoover
patent: 4761723 (1988-08-01), Lendaro
patent: 4763238 (1988-08-01), Maige

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