Switch circuit and electronic device using the same
US8552792B1 · kind B1 · utility
Assignees
Inventor
Key dates
| Filing date | Aug 28, 2012 |
| Grant date | Oct 8, 2013 |
| Priority date | — |
| Expiry date | Aug 28, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/07
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch circuit and an electronic device using the same include a power switch transistor, a controlling circuit, a regulated capacitor, and a capacitor. The power switch transistor is connected between an input and an output of the switch circuit. An output of the controlling circuit is connected to a controlling electrode of the power switch transistor and outputs pulse width modulation (PWM) signals to turn the power switch transistor on and off. The regulated capacitor is connected between an output of the switch circuit and ground. The capacitor is connected between an output of the controlling circuit and ground for increasing an inclination of a rising edge and a falling edge of PWM signals to slow down the speed of switching the power switch transistor on and off, thereby making the regulated capacitor charge slowly and the output voltage of the switch circuit stable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.