JPS558672A - Power source unit of video apparatus - Google Patents

Power source unit of video apparatus

Info

Publication number
JPS558672A
JPS558672A JP8181278A JP8181278A JPS558672A JP S558672 A JPS558672 A JP S558672A JP 8181278 A JP8181278 A JP 8181278A JP 8181278 A JP8181278 A JP 8181278A JP S558672 A JPS558672 A JP S558672A
Authority
JP
Japan
Prior art keywords
video
power source
frequency
output
prescribed
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
JP8181278A
Other languages
Japanese (ja)
Other versions
JPS6229949B2 (en
Inventor
Chojuro Yamamitsu
Hiroshi Taniguchi
Sadafumi Kitamura
Masamitsu Otsu
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.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial 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 Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP8181278A priority Critical patent/JPS558672A/en
Publication of JPS558672A publication Critical patent/JPS558672A/en
Publication of JPS6229949B2 publication Critical patent/JPS6229949B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Details Of Television Scanning (AREA)

Abstract

PURPOSE:To make a power source unit small-size and light without giving bad influences to video by making the switching period of the power source circuit into a prescribed value. CONSTITUTION:The commercial AC output passing through rectification smoothing circuit 2 is switched at a period such as frequency (2m+1)/2XfH where AC-DC converter 3, where the level controlling feedback signal dependent upon the comparison between the reference voltage of comparison circuit 7 and the commercial AC output above and the feedback control signal outputted from oscillator 10 and pulse width modulator 9 are applied, is interleaved to horizontal synchronizing frequency fH of video signals, and becomes a fixed-polarity pulse voltage including no harmonic components which give influences onto video in a prescribed level at a prescribed frequency. As a result, a DC output for video apparatus including ripple which does not influence visually is generated from rectification smoothing circuit 5.
JP8181278A 1978-07-04 1978-07-04 Power source unit of video apparatus Granted JPS558672A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP8181278A JPS558672A (en) 1978-07-04 1978-07-04 Power source unit of video apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP8181278A JPS558672A (en) 1978-07-04 1978-07-04 Power source unit of video apparatus

Publications (2)

Publication Number Publication Date
JPS558672A true JPS558672A (en) 1980-01-22
JPS6229949B2 JPS6229949B2 (en) 1987-06-29

Family

ID=13756900

Family Applications (1)

Application Number Title Priority Date Filing Date
JP8181278A Granted JPS558672A (en) 1978-07-04 1978-07-04 Power source unit of video apparatus

Country Status (1)

Country Link
JP (1) JPS558672A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60160050A (en) * 1984-01-30 1985-08-21 Canon Inc Information signal reproducing device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63202557U (en) * 1987-06-19 1988-12-27

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115116A (en) * 1976-03-24 1977-09-27 Hitachi Ltd Dc constant-voltage source circuit

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52115116A (en) * 1976-03-24 1977-09-27 Hitachi Ltd Dc constant-voltage source circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60160050A (en) * 1984-01-30 1985-08-21 Canon Inc Information signal reproducing device

Also Published As

Publication number Publication date
JPS6229949B2 (en) 1987-06-29

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