Overcurrent detecting apparatus

Details Overcurrent detecting apparatus Overcurrent detecting apparatus

1991-06-17

1993-02-16

Sikes, William L.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307362, 307491, H03K 5153

Patent

active

051873877

ABSTRACT:
An apparatus for detecting an overcurrent flowing in a power element comprises a sampling resistor, a detector resistor, a reference resistor, a reference potential generator, and a comparator. The sampling resistor generates a sampling potential according to a current flowing in the power element. The detector resistor generates a reference potential. The reference resistor retains a constant resistance ratio relative to the sampling resistor. The reference potential generator alters the reference potential in accordance with a current flowing across the reference resistor. The comparator compares the sampling potential with the reference potential to thereby detect an overcurrent in the power element.

REFERENCES:
patent: 4331888 (1982-05-01), Yamauchi
patent: 4634902 (1987-01-01), Tanaka et al.
patent: 4922132 (1990-05-01), Horvitz et al.
patent: 5061863 (1991-10-01), Mori et al.
patent: 5087830 (1992-02-01), Cave et al.

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