Base drive circuit for a switching power transistor

Details Base drive circuit for a switching power transistor Base drive circuit for a switching power transistor

1984-09-10

1986-06-17

Leung, Philip H.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 41, 363 97, 323289, 307297, H02M 3335

Patent

active

045959749

ABSTRACT:
A circuit for controlling the base drive of switching transistor in a power supply wherein the switching transistor is coupled to the primary winding of a transformer linking the primary and secondary circuits of the power supply. Optimum operation of the switching transistor implies a desired level of saturation thereof. Base drive for the switching transistor is provided by a second conducting transistor. An excess of current flowing in the switching transistor is sensed, thereby effecting a reduction in the current flow in the second transistor. The latter condition causes a diminution in the base drive of the switching transistor and a return to its desired level of saturation.

REFERENCES:
patent: 4063307 (1977-12-01), Stephens
patent: 4253136 (1981-02-01), Nanko
patent: 4315303 (1982-02-01), Snyder
patent: 4342956 (1982-08-01), Archer
patent: 4353112 (1982-10-01), Rietveld et al.
patent: 4454573 (1984-06-01), Petsch et al.
patent: 4481504 (1984-11-01), Balaban
patent: 4481565 (1984-11-01), Colton

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