Current sensing circuit and corresponding DC-DC converter
US12273030B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 2022 |
| Grant date | Apr 8, 2025 |
| Priority date | — |
| Expiry date | May 20, 2043 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02M3/1588
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A power switch current sensing circuit includes matching first and second transistors having sources connected to first and second terminals, respectively, of the power switch. A current mirror has a first node coupled to a drain of the first transistor and a second node coupled to a drain of the second transistor. The current mirror sinks a current from the first node equal to a current flowing through the second transistor. A biasing circuit provides a same biasing voltage to the control terminals of the first and second transistors. An output resistance is coupled between the first node and a reference voltage node. A difference between a current flowing through the first transistor and the current sunk by the current mirror circuit from the first node flows through the output resistance. An output voltage produced at the first node is indicative of the current flowing through the power switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.