Title:
SIGNAL GENERATOR DISPLAYING DIRECT CURRENT COMPONENT OF ALTERNATING CURRENT WAVEFORM
Document Type and Number:
Japanese Patent JPS6049268
Kind Code:
A
Abstract:
The DC content of an AC waveform is detected by a digital filter which partially filters each phase of the waveform and applies the filtered waveforms sequentially through a multiplexer to a sample and hold circuit which measures the instantaneous value of each phase at two points which are spaced an exact odd number of half cycles apart. The time interval between the measurement points is adjusted according to variations in the AC waveform frequency to maintain required spacing. The measured instantaneous values are fed by an analog to digital converter and to a microprocessor system which averages the two readings to generate a signal corresponding to the DC content for each phase.
Inventors:
MAAKU AREN ROSUWAAMU
Application Number:
JP15194684A
Publication Date:
March 18, 1985
Filing Date:
July 20, 1984
Export Citation:
Assignee:
WESTINGHOUSE ELECTRIC CORP
International Classes:
G01R19/00; G01R19/02; H02H3/50; (IPC1-7): G01R19/02
Domestic Patent References:
| JPS57141563A | 1982-09-01 | |||
| JPS55143454A | 1980-11-08 | |||
| JPS5523694A | 1980-02-20 | |||
| JPS5575655A | 1980-06-07 |
Attorney, Agent or Firm:
Soga Doteru (6 people outside)