Current sensor for measuring current in a semiconductor switch

Details Current sensor for measuring current in a semiconductor switch Current sensor for measuring current in a semiconductor switch

1990-06-25

1991-05-14

Wieder, Kenneth

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With coupling means

324126, 324117R, G01R 2702, G01R 3102

Patent

active

050159453

ABSTRACT:
A current sensor for measuring relatively high currents in a semiconductor power switching device includes a coil wound around a nonmagnetic toroidal core situated about the conductor through which the current to be measured is flowing. The voltage between the open terminals of the coil winding is proportional to the time derivative of the current flowing in the conductor passing through the toroid. This voltage is provided to an integrator which supplies the corresponding current at its output. A control circuit resets the integrator once per cycle when the current in the switching device is zero. For a bidirectional switching device, a pulse width control circuit ensures that the integrator is reset for a fixed time before the current therein reverses direction. Any accumulation of errors, due to DC and relatively low-frequency components of current, is avoided and current measurements are reliable.

REFERENCES:
patent: 4023100 (1977-05-01), Smutny
patent: 4160922 (1979-07-01), Rickenbacker
patent: 4783690 (1988-11-01), Walden et al.
patent: 4794327 (1988-12-01), Fernandes
patent: 4896089 (1990-01-01), Kliman et al.

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