Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1996-07-16
1997-11-18
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323284, 323289, G05F 140, G05F 142, G05F 1607
Patent
active
056891784
ABSTRACT:
The present invention provides a self-oscillation type DC-DC converter that can perform self-oscillating operation without disposing a feedback winding in a choke coil and realizes the high efficiency, small size and low cost by using a MOSFET as a switching element. The self-oscillation type DC-DC converter comprises a switching transistor Q12 being a P-MOSFET; a first PNP type driving transistor Q2, the collector and emitter of which are connected to the gate and source of the switching transistor Q12, respectively and the base of which is connected to the switching transistor Q12 through a feedback circuit 3; and a second NPN type driving transistor Q3, the gate of the switching transistor Q12 being connected to the ground through the collector and emitter of the second driving transistor Q3 and the base of the second driving transistor Q3 being connected to the feedback circuit 3 through a capacitor C4.
REFERENCES:
patent: 4859927 (1989-08-01), Meijer
patent: 4903182 (1990-02-01), Pilukaitis et al.
patent: 5389871 (1995-02-01), Otake
Toko Inc.
Vu Bao Q.
Wong Peter S.
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