Circuits for detecting AC- or DC-coupled loads
US9035642B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 30, 2011 |
| Grant date | May 19, 2015 |
| Priority date | — |
| Expiry date | Nov 13, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R31/2843
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An integrated circuit includes an output terminal and a controller having a measurement input coupled to the output terminal, a first output adapted to couple to a current source to control a first current sourced into the output terminal, and a second output adapted to couple to a current sink to control a second current from the output terminal. The controller applies control signals to the first output and the second output to selectively enable the current source and disable the current sink during a first phase of a load detection period and to disable the current source and enable the current sink during a second phase of the load detection period. The controller detects the load coupled to the output terminal if a voltage at the measurement terminal during the first phase is substantially equal to a voltage at the measurement terminal during the second phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.