Self-excited DC-DC converter with temperature compensation

Details Self-excited DC-DC converter with temperature compensation Self-excited DC-DC converter with temperature compensation

1999-06-11

2000-11-21

Riley, Shawn

Electric power conversion systems

Current conversion

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

323288, H02M 3335

Patent

active

061512230

ABSTRACT:
A self-excited DC-DC converter and a power supply device using the same which can produce a constant output voltage for a wide range of input voltage without using high voltage components. The self-excited DC-DC converter includes a first transistor for switching an input DC voltage to produce an output voltage whose voltage value is down converted from the input DC voltage, a primary winding one end of which is connected to a collector of the first transistor, a diode whose cathode is connected to a connection point of the first transistor and the primary winding and whose anode is connected to the ground, a capacitor connected between the other end of the primary winding and the ground, a feedback winding magnetically coupled to the primary winding and connected between a base and an emitter of the first transistor, and a second transistor provided between the base and emitter of the first transistor for bypassing a base current of the first transistor in such a way that the amount of bypassing the base current is regulated in response to a value of the output voltage.

REFERENCES:
patent: 4626982 (1986-12-01), Huber
patent: 5392206 (1995-02-01), Peterson et al.

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