Method and apparatus for low voltage CMOS start circuit
US5612861A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 1995 |
| Grant date | Mar 18, 1997 |
| Priority date | — |
| Expiry date | Jul 19, 2015 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A method and apparatus for low voltage start circuit is provided. The start circuit (140) includes a first voltage converter (203) having a first booster circuit (210) and a first voltage multiplier (220) for converting a DC battery voltage to a converted DC voltage. The converted DC voltage is connected to an input of a second booster circuit (230) of a second voltage converter (205). The second voltage converter (205) includes the second booster circuit (230) and a second voltage multiplier (240). An output of the second voltage multiplier (240) is fed back to the input of the second booster circuit (230) for boosting the converted DC voltage to a predetermined threshold value. A voltage detector (136) compares the converted DC voltage to the predetermined threshold value. A controller (141) disables the start circuit (140) and enables a main DC-DC conversion circuit of the pager (100) when the converted DC voltage reaches the predetermined threshold value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.