Drive circuit for a flyback converter with switching transistors

Details Drive circuit for a flyback converter with switching transistors Drive circuit for a flyback converter with switching transistors

1993-09-29

1995-05-02

Sikes, William L.

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Current driver

327494, 327588, H03K 300

Patent

active

054123321

ABSTRACT:
A flyback converter including a first (6) and a second (8) switching transistor, a first (10) and a second (12) rectifier diode, and a primary winding (14) of a transformer, which parts are connected in a bridge arrangement. The first switching transistor (6) receives its drive by positive feedback via a secondary winding (30), a coupling capacitor (36) and a series resistor (38, 40). Upon commutation of the voltage on the secondary winding (30) the first switching transistor (6) is turned off, a discharge diode (44) providing a discharge path for the coupling capacitor (36) in order to achieve that the first switching transistor (6) is turned on more rapidly in the next switching cycle. However, the discharge diode (44) limits the cut-off voltage on the control electrode of the first switching transistor (6), so that turning off proceeds comparatively slowly. This effect is eliminated by a voltage source (46, 48, 52) and a further switching transistor (54) which is turned on upon commutation. The further switching transistor (54) then produces a higher cut-off voltage on the control electrode of the first switching transistor (6), as a result of which the first switching transistor (6) is turned off more rapidly.

REFERENCES:
patent: 4652984 (1987-03-01), Van Der Akker et al.
patent: 4768141 (1988-08-01), Hubertus et al.

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