Switching boosting circuit having internally controlled duty
US5408203A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 22, 1993 |
| Grant date | Apr 18, 1995 |
| Priority date | — |
| Expiry date | Sep 22, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/165
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A switching boosting circuit including a clock oscillating circuit having a Schmitt trigger inverter, a boosted-voltage inducing circuit which is actuated in a switching-operation mode in response to the output clock of the clock oscillating circuit to induce a boosted voltage, a capacitor which is charged by the boosted voltage from the boosted-voltage inducing circuit to store energy to be supplied to a load, and a feedback path for feeding back current whose intensity corresponds to the load from the capacitor to the clock oscillating circuit. The feedback current acts such that the duty ratio of the switching operation is set to be smaller than a predetermined reference duty ratio, and the feedback path includes a Zener diode for reducing the boosted voltage below a predetermined value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.