Control circuit for a switching transistor using a tapped coil w

Details Control circuit for a switching transistor using a tapped coil w Control circuit for a switching transistor using a tapped coil w

1997-01-14

1999-04-06

Sterrett, Jeffrey

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 20, 363131, H02M 7537

Patent

active

058926712

ABSTRACT:
A line deflection circuit for a television receiver or a switched-mode power supply operate with a switching transistor that is connected in series with the primary winding of a transformer and is periodically switched on and off by a switching voltage. In such a circuit, appreciable turn-on and turn-off losses, which reduce the overall efficiency of the circuit, are produced at the switching transistor, particularly at higher operating frequencies. Within a control circuit a DC voltage source is connected to the base of the switching transistor via a periodically actuated switch element and a coil having a core and a tap. The two parts of the coil are wound in opposite senses, and the tap is connected via a diode to ground or to the emitter of the switching transistor. The control circuit further includes a charge-reversal path via which, during a demagnetization phase of the coil, the energy stored in the coil in the form of a current is transferred in the form of a negative voltage to a capacitor that is coupled via a second diode to a first part of the coil. The negative voltage is applied during a residual time subsequent to the demagnetization phase as a reverse voltage to the base of the switching transistor.

REFERENCES:
patent: 4612451 (1986-09-01), Mackawa et al.
JP Patent Abstracts of Japan: 4-96652 A., E-1235, Jul. 16, 1992. vol. 16, No. 326.
JP Patent Abstracts of Japan: 56-115175, A.,E- 85, Dec. 8, 1981, vol. 5, No. 192.

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