Switching power supply unit
US6295214A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 2000 |
| Grant date | Sep 25, 2001 |
| Priority date | — |
| Expiry date | Mar 29, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M1/0009
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switching power supply unit, which rectifies and smoothes an AC current and an AC voltage from the on-off switching operation of a main switching element to output a DC current and a DC voltage, has an output current detection circuit including a current detection resistor disposed in an intermittent-current flowing path through which a current intermittently flows in sync with the on-off switching operation of the main switching element, a synchronous rectifying a switching element for rectifying a current flowing through the current detection resistor, and a capacitor for charging the current rectified by the synchronous rectifying element, wherein the current flowing through the current detection resistor is charged in the capacitor by a rectifying operation of the synchronous rectifying element, and the charging voltage of the capacitor is outputted as a voltage corresponding to the output current of the switching power supply unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.