JPS55116274A - Automatic frequency discriminating circuit for commercial power supply - Google Patents
Automatic frequency discriminating circuit for commercial power supplyInfo
- 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
Links
Landscapes
- Selective Calling Equipment (AREA)
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
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)
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 |
-
1979
- 1979-03-02 JP JP2472979A patent/JPS55116274A/en active Pending
Cited By (4)
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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