JPS55116274A - Automatic frequency discriminating circuit for commercial power supply - Google Patents

Automatic frequency discriminating circuit for commercial power supply

Info

Publication number
JPS55116274A
JPS55116274A JP2472979A JP2472979A JPS55116274A JP S55116274 A JPS55116274 A JP S55116274A JP 2472979 A JP2472979 A JP 2472979A JP 2472979 A JP2472979 A JP 2472979A JP S55116274 A JPS55116274 A JP S55116274A
Authority
JP
Japan
Prior art keywords
power supply
frequency
commercial power
outputs
automatic frequency
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
JP2472979A
Other languages
Japanese (ja)
Inventor
Tomoyuki Shimada
Hideaki Watanabe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Nippon Electric Co Ltd
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 NEC Corp, Nippon Electric Co Ltd filed Critical NEC Corp
Priority to JP2472979A priority Critical patent/JPS55116274A/en
Publication of JPS55116274A publication Critical patent/JPS55116274A/en
Pending legal-status Critical Current

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Abstract

PURPOSE: To discriminate a commercial power supply frequency without using a manual switching means by detecting the outputs of two bandpass filtes having different power supply frequencies as their center frequencies and comparing these outputs.
CONSTITUTION: Commerical power supply is connected to bandpass filter BPF1 having No.1 commercial power supply frequency as its center frequency and also to bandpass filter BPF2 having No.2 commercial power supply frequency as its center frequency, and their outputs are respectively detected by detectors DET1, DET2. Further, these detected outputs are compared in comparator A3, and thereby a signal to discriminate whether it is No.1 frequency or No.2 frequency is obtained. Consequently, it is possible to discriminate automatically a 50Hz or 60Hz commerical power supply frequency without using a manual switching means, so that it is possible to switch instantly a circuit when the commercial power supply frequency requires the switching.
COPYRIGHT: (C)1980,JPO&Japio
JP2472979A 1979-03-02 1979-03-02 Automatic frequency discriminating circuit for commercial power supply Pending JPS55116274A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2472979A JPS55116274A (en) 1979-03-02 1979-03-02 Automatic frequency discriminating circuit for commercial power supply

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2472979A JPS55116274A (en) 1979-03-02 1979-03-02 Automatic frequency discriminating circuit for commercial power supply

Publications (1)

Publication Number Publication Date
JPS55116274A true JPS55116274A (en) 1980-09-06

Family

ID=12146232

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2472979A Pending JPS55116274A (en) 1979-03-02 1979-03-02 Automatic frequency discriminating circuit for commercial power supply

Country Status (1)

Country Link
JP (1) JPS55116274A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55172867U (en) * 1979-05-30 1980-12-11
US7002123B2 (en) * 2001-12-08 2006-02-21 Samsung Electronics Co., Ltd. Microwave oven and method of controlling the same
EP2772766A3 (en) * 2013-02-25 2015-04-15 Dialog Semiconductor Inc. Power line frequency detector

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS55172867U (en) * 1979-05-30 1980-12-11
US7002123B2 (en) * 2001-12-08 2006-02-21 Samsung Electronics Co., Ltd. Microwave oven and method of controlling the same
EP2772766A3 (en) * 2013-02-25 2015-04-15 Dialog Semiconductor Inc. Power line frequency detector
US9625505B2 (en) 2013-02-25 2017-04-18 Dialog Semiconductor Inc. Line frequency detector

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