Power supply topology enabling bipolar voltage output from a sin

Details Power supply topology enabling bipolar voltage output from a sin Power supply topology enabling bipolar voltage output from a sin

1995-01-03

1996-03-19

Pendegrass, Joan H.

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363 61, G03G 1500, H02M 300

Patent

active

055007210

ABSTRACT:
A power supply circuit which converts an A.C. signal into an output signal that combines A.C. and D.C. voltages components. The circuit uses a voltage doubler topology with transistors. The transistors are controlled by waveform generators, which generate a series of pulses. By adjusting the duty cycle of the pulses, the appropriate D.C. voltages components can be formed. By adjusting the duty cycle of the positive output producing pulses and negative output producing pulses relative to each other, the required A.C. signal can be adjusted. A scavengeless developer in a xerographic machine requires three bias voltage inputs. The power supply circuit can be attached to a transformer connected to an appropriate A.C. power source to produce the required voltage signals to control the operation of the developer.

REFERENCES:
patent: 3316475 (1967-04-01), Hayama et al.
patent: 3760255 (1973-09-01), Grodinsky
patent: 3851240 (1974-11-01), Park et al.
patent: 4138635 (1979-02-01), Quinn
patent: 4819145 (1989-04-01), Maeba

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