Active impedance multiplier

Details Active impedance multiplier Active impedance multiplier

H - Electricity

02

H

335/2, 348/26, 3

H02H 3/16 (2006.01) H02H 3/17 (2006.01)

Patent

CA 1049131

ABSTRACT An active impedance multiplier circuit that can, as one of its uses, be used in a mine ground fault detec- tion system. The purpose of the multiplier is to create a very high impedance for an AC signal that normally flows through a low impedance legitimate load. To accomplish this, the output of the multiplier is put in parallel with the low impedance load and impresses upon the load an appropriate voltage and current. When used in a fault de- tecting system, the impedance multiplier will act to normally prevent current from flowing in the low impedance load. AC current will flow to the legitimate load from the multiplier in response to signals obtained from an alternating current detector located within each multi- plier. In its most basic form, the active impedance mul- tiplier can be said to consist of a current detector and a current amplifier to amplify the detected current by a constant factor. The amplified output from the multiplier is in turn connected in parallel across the legitimate load.

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