Voltage step-up circuit and method for controlling the same
US5959854A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 1998 |
| Grant date | Sep 28, 1999 |
| Priority date | — |
| Expiry date | Jun 30, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/073
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A voltage step-up circuit includes a voltage detecting circuit for generating a discriminating signal when a stepped-up voltage is lower than a previously set value, an oscillating circuit responding to the discriminating signal to oscillate to generate an oscillation signal, a plurality of control circuits receiving the discriminating signal and the oscillation signal in a phase different from one control circuit to another, and a plurality of charge pump circuits independently controlled by the plurality of control circuits, respectively. Each of the control circuits includes a latch circuit for storing a logical condition of an output from each control circuit to a corresponding charge pump circuit when the corresponding charge pump circuit stopped its charge pump operation, a first path receiving the oscillation signal for outputting the oscillation signal as its is to the corresponding charge pump circuit, and a second path receiving the oscillation signal and having an inverter for outputting an inverted signal of the oscillation signal to the corresponding charge pump circuit. the first path and the second path are controlled by the latch circuit to alternatively activated t…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.