Power supply topology enabling bipolar voltage output from a single voltage input
US5500721A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 3, 1995 |
| Grant date | Mar 19, 1996 |
| Priority date | — |
| Expiry date | Jan 3, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M7/48
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.