Circuit assembly for doubling the voltage of a battery
US6617828B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 3, 2001 |
| Grant date | Sep 9, 2003 |
| Priority date | — |
| Expiry date | Aug 9, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/073
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A circuit assembly for doubling the voltage of a battery includes a charge pump (12) fed by the battery voltage and controlled by a clock generator (10). The supply voltage of the clock generator is the voltage output by the charge pump (12). The source/drain circuit of a field-effect transistor (P4) is inserted in the connection between the output of the charge pump (12) and the battery (26), the field-effect transistor (P4) being ON when its gate voltage is smaller than its source voltage. Connected to the gate of the field-effect transistor (P4) is the output circuit branch (N2) of a current mirror circuit (32) through which a limited small current is derivable from the gate to ground. An auxiliary charge pump (22) is provided which receives its supply voltage from the output of the charge pump (12) and which is likewise controlled by the clock generator (10). The voltage generated by the auxiliary charge pump (22) is placed on the gate of the field-effect transistor (P4) to switch it OFF.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.