Title: Control circuit for a switched-mode power supply, particularly for a television receiver

Abstract: A switched-mode power supply provided with a control stage and a switching stage coupled by means of a transformer. The collector of an additional transistor is connected to the transformer. In this manner the ratio of the collector current to the base current of the switching transistor can assume a predetermined value, for example a constant value whatever the value of the mains voltage applied to the power supply.

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Inventors: Beuchee, Daniel (Paris, FR)
Leclair, Alain (Poissy, FR)

Application Number: 639277
Filing Date: 1975-12-10
Publication_date: 1977-06-07
Assignee: U.S. Philips Corporation (Briarcliff Manor, NY)
Primary Class(es): 363/20 315/399, 348/730, 363/37
Other Classes:
US Patent Ref:

3376489	Apr, 1968	Crayton	321/2.
3742330	Jun, 1973	Hodges et al.	323/DIG.
3925716	Dec, 1975	Griffey	321/2.
3943425	Mar, 1976	Kupka et al.	321/2.

Other Refs:
Primary Examiner: Goldberg, Gerald
Assistant Examiner:
Attorney: Trifari; Frank R., Steckler; Henry I.