Method and system of slow output voltage ramp control for a power supply
US6646897B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 30, 2002 |
| Grant date | Nov 11, 2003 |
| Priority date | — |
| Expiry date | Apr 30, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0025
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A pulse width modulation controller is coupled to a feedback voltage that is proportional to the power supply output voltage. The controller adjusts a current sense threshold in the controller in response to the feedback voltage. An offset voltage is generated for a predetermined time after the power-up of the power supply. A sum of the offset voltage and a primary current sense node voltage is applied to a current sense input of the controller. The controller generates a switch control signal in response to the sum voltage being less than the current sense threshold. The duty cycle of an output control switch is changed by the switch control signal thus adjusting the output voltage ramp.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.