JPH03196716A - Signal detection circuit - Google Patents

Signal detection circuit

Info

Publication number
JPH03196716A
JPH03196716A JP1335053A JP33505389A JPH03196716A JP H03196716 A JPH03196716 A JP H03196716A JP 1335053 A JP1335053 A JP 1335053A JP 33505389 A JP33505389 A JP 33505389A JP H03196716 A JPH03196716 A JP H03196716A
Authority
JP
Japan
Prior art keywords
signal
input voltage
circuit
voltage detection
zero
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1335053A
Other languages
Japanese (ja)
Inventor
Hiroshi Miyazaki
Original Assignee
Toshiba Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toshiba Corp filed Critical Toshiba Corp
Priority to JP1335053A priority Critical patent/JPH03196716A/en
Publication of JPH03196716A publication Critical patent/JPH03196716A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To simplify the constitution by ORing an AC zero cross signal and an AC input voltage detection signal so as to synthesize both the signals.
CONSTITUTION: An AC input voltage signal detection circuit 3 outputs an H level logic signal as an AC input voltage detection signal. Then an OR circuit 8 ORs an AC zero cross signal detected by an AC zero cross signal detection circuit 2 and an AC input voltage detection signal detected by the circuit 3 to synthesize them and the result is outputted as a synthesis signal. Normally the AC zero cross signal is sent as the synthesis signal and an H level AC input voltage detection signal is outputted when the AC input voltage detection signal is outputted. Then the synthesis signal controls a microcomputer 6 and a device 7 to be controlled. Thus, one circuit 5 is enough in the device controlled by the synthesis signal and one input pin of the microcomputer 6 is enough to simplify the constitution.
COPYRIGHT: (C)1991,JPO&Japio
JP1335053A 1989-12-26 1989-12-26 Signal detection circuit Pending JPH03196716A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1335053A JPH03196716A (en) 1989-12-26 1989-12-26 Signal detection circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1335053A JPH03196716A (en) 1989-12-26 1989-12-26 Signal detection circuit

Publications (1)

Publication Number Publication Date
JPH03196716A true JPH03196716A (en) 1991-08-28

Family

ID=18284221

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1335053A Pending JPH03196716A (en) 1989-12-26 1989-12-26 Signal detection circuit

Country Status (1)

Country Link
JP (1) JPH03196716A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698262A (en) * 2015-03-04 2015-06-10 广东美的制冷设备有限公司 Zero cross detection circuit and variable frequency air conditioner

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104698262A (en) * 2015-03-04 2015-06-10 广东美的制冷设备有限公司 Zero cross detection circuit and variable frequency air conditioner
CN104698262B (en) * 2015-03-04 2017-06-09 广东美的制冷设备有限公司 A kind of zero cross detection circuit and convertible frequency air-conditioner

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