JPS56169987A - Multioutput switching power supply circuit - Google Patents

Multioutput switching power supply circuit

Info

Publication number
JPS56169987A
JPS56169987A JP7448280A JP7448280A JPS56169987A JP S56169987 A JPS56169987 A JP S56169987A JP 7448280 A JP7448280 A JP 7448280A JP 7448280 A JP7448280 A JP 7448280A JP S56169987 A JPS56169987 A JP S56169987A
Authority
JP
Japan
Prior art keywords
power supply
noise
frequency
multioutput
switching
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.)
Granted
Application number
JP7448280A
Other languages
Japanese (ja)
Other versions
JPS6030157B2 (en
Inventor
Kiyonobu Hayazaki
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 JP55074482A priority Critical patent/JPS6030157B2/en
Publication of JPS56169987A publication Critical patent/JPS56169987A/en
Publication of JPS6030157B2 publication Critical patent/JPS6030157B2/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M19/00—Current supply arrangements for telephone systems

Abstract

PURPOSE:To obtain a power supply with low noise without being affected with low frequency beat noise among power supplies, by setting individual switching frequencies of switching power supplies used for subscriber circuits of a time sharting type telephone exchanger with a given interval shifted. CONSTITUTION:A 2-output power supply consists of an input side line filter 1, two DC-DC converters 2, 4 and two power supply control circuits 3, 5 and an input power supply is inputted to a terminal 6 and an output voltage is picked up from terminals 7, 8. Taking the conversion frequency of the converters 2, 4 with the constitution like this as f1, f2, the fundamental wave component of the noise spectrum of this multioutput switching circuit is four components like f1, f2 and their beat frequencies f2-f1 and f1+f2. The converted frequency of a converter is normally more tank 20kHz. The multioutput switching power supply circuit with low noise can be obtained by setting the component of the beat noise frequency in f2-f1 as more than the audio band.
JP55074482A 1980-06-03 1980-06-03 Multi-output switching power supply circuit Expired JPS6030157B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55074482A JPS6030157B2 (en) 1980-06-03 1980-06-03 Multi-output switching power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55074482A JPS6030157B2 (en) 1980-06-03 1980-06-03 Multi-output switching power supply circuit

Publications (2)

Publication Number Publication Date
JPS56169987A true JPS56169987A (en) 1981-12-26
JPS6030157B2 JPS6030157B2 (en) 1985-07-15

Family

ID=13548531

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55074482A Expired JPS6030157B2 (en) 1980-06-03 1980-06-03 Multi-output switching power supply circuit

Country Status (1)

Country Link
JP (1) JPS6030157B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2820897A1 (en) * 2001-02-13 2002-08-16 Koito Mfg Co Ltd IGNITION CIRCUIT OF SEVERAL DISCHARGE LAMPS IN A NON-SYNCHRONIZED MANNER
CN103546023A (en) * 2013-10-31 2014-01-29 烽火通信科技股份有限公司 Method for suppressing beat frequency noise of multiple switch power sources

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2820897A1 (en) * 2001-02-13 2002-08-16 Koito Mfg Co Ltd IGNITION CIRCUIT OF SEVERAL DISCHARGE LAMPS IN A NON-SYNCHRONIZED MANNER
CN103546023A (en) * 2013-10-31 2014-01-29 烽火通信科技股份有限公司 Method for suppressing beat frequency noise of multiple switch power sources

Also Published As

Publication number Publication date
JPS6030157B2 (en) 1985-07-15

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