Title:
AC SIGNAL LEVEL DETECTION CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2003/075019
Kind Code:
A1
Abstract:
AC voltage generated by an AC power source (1) is rectified by a full wave rectifying circuit (2), which generates rectified voltage. An internal regulator (33) performs waveform shaping of the rectified voltage. A comparator (42) compares a rectified voltage output from the internal regulator (33) to a reference voltage (V1) and detects a period when the rectified voltage exceeds the reference voltage (V1). According to an output signal of the comparator (42), a judgment signal generation circuit (50) judges the power source voltage supplied from the AC power source (1) and generates a judgment signal. Accordingly, there is no need of a capacitor for detecting the peak value of the rectified voltage and it is possible to reduce the size and cost of the AC voltage detection circuit.
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Inventors:
SIMADA MASAAKI (JP)
YAMADA TOMOYASU (JP)
SEKIGUCHI KEIICHI (JP)
YAMADA TOMOYASU (JP)
SEKIGUCHI KEIICHI (JP)
Application Number:
PCT/JP2003/002651
Publication Date:
September 12, 2003
Filing Date:
March 06, 2003
Export Citation:
Assignee:
SANKEN ELECTRIC CO LTD (JP)
SIMADA MASAAKI (JP)
YAMADA TOMOYASU (JP)
SEKIGUCHI KEIICHI (JP)
SIMADA MASAAKI (JP)
YAMADA TOMOYASU (JP)
SEKIGUCHI KEIICHI (JP)
International Classes:
G01R19/165; G01R19/04; (IPC1-7): G01R19/165
Foreign References:
| JPS50122285A | 1975-09-25 | |||
| JPS5317374A | 1978-02-17 | |||
| JPH02176473A | 1990-07-09 |
Attorney, Agent or Firm:
Kimura, Mitsuru (Kyohan Building 7, Kandanishiki-cho 2-chom, Chiyoda-ku Tokyo, JP)
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