Soft-start circuit having a ramp-up voltage and method thereof
US8390263B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2008 |
| Grant date | Mar 5, 2013 |
| Priority date | — |
| Expiry date | Dec 26, 2028 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/156
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A soft-start circuit and a method thereof are described. The circuit includes an amplifier and a voltage ramp generator. The amplifier has a first input end, a second input end, an output end, and a power source control end. The first input end is coupled to a reference voltage. The second input end is coupled to a feedback voltage. The output end outputs an output voltage, and the feedback voltage corresponds to the output voltage. The voltage ramp generator is coupled to the power source control end, and generates a ramp-up voltage. When the ramp-up voltage is lower than a threshold value, the output voltage rises with the ramp-up voltage. When the ramp-up voltage is not lower than the threshold voltage, the output voltage remains at a stable value. A surge current occurring during smooth soft-start or even in operation is thus prevented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.