Apparatus for detecting DC content of an AC waveform
US5459417A · kind A · utility
2Cited by
5References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 28, 1993 |
| Grant date | Oct 17, 1995 |
| Priority date | — |
| Expiry date | Jun 28, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R19/003
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A circuit for monitoring the DC content of an AC waveform includes a differential amplifier having one input connected to the AC waveform and the other input connected to a capacitive-coupled network that eliminates any DC component in the AC waveform at the frequency being monitored. Additional circuitry is required to cancel any phase shift and reactance of the coupling capacitor. The output of the differential amplifier is a signal which represents the amplitude and polarity of the DC content.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.