Power-supply circuit

Details Power-supply circuit Power-supply circuit

1986-09-22

1988-08-30

Salce, Patrick R.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363124, H02M 7155

Patent

active

047681420

ABSTRACT:
A power supply circuit which maintains the voltage across a first capacitor (C.sub.1) substantially constant over a wide range of mains voltages, the capacitor (C.sub.1) energizes a motor (M) and is charged during the rising edges of the applied mains voltage in that above a specific input voltage (U.sub.min) a first transistor (T.sub.1) is turned on via a second capacitor (C.sub.2) and a first resistor (R.sub.2). When the rectified mains voltage at the output of a diode (D.sub.1) exceeds a specific value (U.sub.2) defined by a first zener diode (Z.sub.2), a second transistor (T.sub.2) is turned on. Consequently, the first transistor is turned off. When the first transistor (T.sub.1) is cut off, the first capacitor is discharged through the motor. The second capacitor is then discharged via a second zener diode (Z.sub.1) and prevents the first transistor from being turned on.

REFERENCES:
patent: 4001668 (1977-01-01), Lewis
patent: 4034281 (1977-07-01), Morita et al.
patent: 4641233 (1987-02-01), Roy

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