Calibration circuit for calibrating frequency characteristics of an AC/DC converter
US5933013A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 19, 1996 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Nov 19, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R35/005
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A calibration circuit of an AC/DC converter which measures an AC voltage by converting the AC voltage to a DC voltage. The AC/DC converter measures the AC voltage with high accuracy with low cost by having a calibration circuit to correct the frequency response characteristic involved in an AC/DC conversion process. The AC/DC converter includes a signal generator for generating at least two calibration signals having the same energy level and different frequency spectrums, a switch for selecting the input signal to be measured or one of the calibration signals from the signal generator, an amplifier for amplifying the selected signal from the switch wherein the amplifier has a circuit arrangement for adjusting a frequency characteristic thereof, and an AC/DC conversion circuit for converting an AC voltage from the amplifier to a corresponding DC voltage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.