Circuit and method for load detection using switched capacitors
US10656188B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 14, 2017 |
| Grant date | May 19, 2020 |
| Priority date | — |
| Expiry date | Jul 14, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/64
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A load detection circuit includes a variable current source circuit having a first input connected to a power supply, a second input, and a first output connected to an output load; a switched capacitor circuit having a third input connected to an external voltage reference signal, a fourth input connected to the first output of the variable current source, a fifth input connected to ground, a sixth input, and a second output; a comparator having a seventh input connected to the second output of the switched capacitor circuit, an eighth input connected to the first output of the variable current source, and a third output; an edge detector having a ninth input connected to the third output of the comparator, and a fourth output; and a digital controller having a fifth output connected to the variable current source and a sixth output connected to the switched capacitor circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.