AC signal level detection circuit

Details AC signal level detection circuit AC signal level detection circuit

2007-09-18

2007-09-18

Karlsen, Ernest (Department: 2829)

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rectifier

C324S111000

Reexamination Certificate

active

10506641

ABSTRACT:
An AC voltage generated by an AC power source1is rectified by a full-wave rectifying circuit2, which generates a rectified voltage. An internal regulator33performs waveform shaping of the rectified voltage. A comparator42compares the rectified voltage output from the internal regulator33with a reference voltage V1and detects a period in which the rectified voltage exceeds the reference voltage V1. According to an output signal of the comparator42, a determination signal generation circuit50determines the power source voltage supplied form the AC power source1and generates a determination signal. Accordingly, there is no need of a capacitor, etc. for detecting the peak value of the rectified voltage, and it is possible to reduce the size and cost of an AC voltage detection circuit.

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