Method and apparatus for sampling output AC currents in a voltag

Details Method and apparatus for sampling output AC currents in a voltag Method and apparatus for sampling output AC currents in a voltag

1984-04-03

1985-05-28

Smith, Jr., David

Electricity: motive power systems

With signals, meters, recorders or testing devices

318805, 318811, G01R 1900, H02P 540

Patent

active

045202982

ABSTRACT:
In a voltage-source inverter AC power supply, the AC currents are measured exclusively by sampling the DC current in the DC link between voltage-source and inverter. Each sample so derived is correlated to the status of the switches in the inverter at the instant of sampling, or before and after a change in the switching status of the inverter. This technique applies more generally to pulse-width modulation applications, but also to an adjustable voltage input (AVI) inverter motor drive.

REFERENCES:
patent: 4351022 (1982-09-01), Dolland et al.
patent: 4394610 (1983-07-01), Dolland

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