Switching power supply startup circuit having normally on emitter-switched current source
US9337720B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 28, 2014 |
| Grant date | May 10, 2016 |
| Priority date | — |
| Expiry date | Jul 13, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0006
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power converter startup circuit establishes an operating voltage for control circuitry during startup and is then disabled to reduce no-load power dissipation. The startup circuit has a normally on characteristic to automatically provide startup charging current for a startup capacitor. The control circuitry begins operating as the startup capacitor voltage reaches an operating value, and it generates an inhibitory signal that disables the startup circuit to stop the startup charging current and reduce power dissipation. The normally on characteristic is achieved by an emitter switched current source employing a normally on device such as a depletion-mode J-FET. A resistor divider network provides both biasing for the startup current source and a point of monitoring the power supply input voltage during steady state operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.