Power supply for a.c. corotrons

Details Power supply for a.c. corotrons Power supply for a.c. corotrons

1986-04-17

1987-12-22

Hix, L. T.

Electricity: electrical systems and devices

Electric charge generating or conducting means

With specific power supply

355 3CH, E03G 1500

Patent

active

047149787

ABSTRACT:
A circuit for supplying power to the a.c. corotrons of copying or printing machines using a high leakage inductance type transformer both as a power transformer and as a low pass filter; a d.c. power source coupled to the transformer primary winding center tap; a push-pull amplifier having a MOSFET gate pair controlling energization of the transformer primary winding halves by the d.c. power source; a pulse width modulator for supplying alternating signal pulses to the MOSFET pair at a fixed frequency; a voltage doubler network for monitoring corotron current, the modulator adjusting the pulse width of the signal pulses in response to the network control signal to thereby adjust the power output of the circuit and maintain a constant corotron current; and a capacitor at the transformer output cooperable with the transformer to form said low pass filter.

REFERENCES:
patent: 4004209 (1977-01-01), Lawson, Jr.
patent: 4210858 (1980-07-01), Ford et al.
patent: 4234249 (1980-11-01), Weikel, Jr. et al.
patent: 4281374 (1981-07-01), Archer
patent: 4484812 (1984-11-01), Takayanagi
patent: 4516848 (1985-05-01), Moriya
patent: 4602308 (1986-07-01), Montague
patent: 4628426 (1986-12-01), Steigerwald
Texas Instruments Spec. Sheets on "Regulating Pulse Width Modulators", pp. 6-69, 6-74, 6-75 (1982).

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