AC voltage identification circuit

Details AC voltage identification circuit AC voltage identification circuit

1990-10-24

1992-08-11

LaRoche, Eugene R.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307564, 307261, 328 26, 363143, H03K 5153, H03K 508, H03K 500, H02M 704

Patent

active

051381923

ABSTRACT:
An AC voltage identification circuitry includes a rectifying circuit, a sensor circuit, a discharge circuit, a storage circuit and a clamping element. The identification circuit is connected to an AC circuit for identifying the magnitude of the AC voltage. The AC current is rectified and a capacitor in a storage circuit is charged through a resistor. The height of the voltage is sensed by means of resistors in the sensor circuit. As the sensor circuit senses a higher voltage, it causes a transistor in the discharge circuit to discharge the capacitor in the storage circuit rapidly to a near zero voltage through its resistor. If the input is a low voltage signal, the transistor on the discharge circuit cannot cause the capacitor on the storage circuit to discharge, and the capacitor is thus charged to a relatively higher voltage. Its maximum voltage is then clamped by the voltage clamping circuit. The height of the voltage in the capacitor on the storage circuit identifies the height of the input AC voltage.

REFERENCES:
patent: 3787755 (1974-01-01), Goldner
patent: 3900787 (1975-08-01), Koster
patent: 4658345 (1987-04-01), Ingman
patent: 4864488 (1989-09-01), Bulmahn et al.

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