Current estimating circuit for switch mode power supply
US5457620A · kind A · utility
70Cited by
7References
19Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 30, 1993 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Jul 30, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/40
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a switch mode power supply the switch current of the power switch is connected to a low pass filter network during the time interval when current is flowing through the power switch. The filter network is disconnected from the power switch when switch current is not flowing. This technique takes advantage of the fact that the average current through the power switch during its conduction interval is either equal to the output current of the power supply, or is proportional with the ratio between the average switch current and the output current being the fixed isolation transformer turns ratio.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.