Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Amplitude control
Patent
1993-09-02
1995-05-16
Sikes, William L.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Amplitude control
327110, 327379, H03K 1760, H03K 17687, H03K 301
Patent
active
054163617
ABSTRACT:
A high efficiency switching power transistor uses the energy in a snubber circuit to drive the gate driver and the pulse-width-modulator (PWM). The snubber consists of a resistor and a capacitor connected in series between the drain and source of a field-effect-transistor (FET). A steering diode is connected from the junction between the capacitor and the resistor to the power supply of the gate driver and PWM. This diode steers current from the snubber and makes it flow into the power supply thereby lowering the power requirements of the power supply. This energy would have been dissipated in the snubber as heat if it were not used this way. Efficiency of the switcher is increased both by lowering heat loss in the snubber and by using recovered snubber energy to lower the power requirements of the power supply of the gate driver and PWM.
REFERENCES:
patent: 3158791 (1962-10-01), Deneen, Jr. et al.
patent: 4010387 (1977-03-01), Akamatsu
patent: 4015185 (1977-03-01), Pollmeier
patent: 4167776 (1978-09-01), Nygaard
patent: 4276588 (1979-06-01), McLyman et al.
patent: 4336587 (1981-06-01), Boettcher, Jr. et al.
patent: 4414479 (1981-07-01), Foley
John Paul
Kutzavitch Walter G.
AT&T Corp.
Caccuro John A.
Nguyen Tiep H.
Sikes William L.
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