JPS5654177A - Power circuit for heater - Google Patents

Power circuit for heater

Info

Publication number
JPS5654177A
JPS5654177A JP12987479A JP12987479A JPS5654177A JP S5654177 A JPS5654177 A JP S5654177A JP 12987479 A JP12987479 A JP 12987479A JP 12987479 A JP12987479 A JP 12987479A JP S5654177 A JPS5654177 A JP S5654177A
Authority
JP
Japan
Prior art keywords
voltage
heater
reduced
winding
control
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
JP12987479A
Other languages
Japanese (ja)
Inventor
Koji Takahashi
Kuninori Kasagi
Machio Kawashima
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP12987479A priority Critical patent/JPS5654177A/en
Publication of JPS5654177A publication Critical patent/JPS5654177A/en
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/66—Transforming electric information into light information
    • H04N5/68—Circuit details for cathode-ray display tubes

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Transforming Electric Information Into Light Information (AREA)

Abstract

PURPOSE:To control the heater voltage to a given value, by controlling the control winding of a saturable transformer according to the output of the voltage variation detecting winding provided to the heater transformer. CONSTITUTION:The flyback pulse based on the variation from a variation voltage detecting winding 8 is detected at an average value detection circuit 21 and fed to the base of an error amplifying transistor TR18 via a sensitivity adjusting variable resistor 17. In this case, when the average value of pulse of increased, the base voltage of TR18 increases and the collector voltage is reduced. Accordingly, the base voltage of TR19 is dropped and the collector current is reduced. Thus, the control current flowing to the control winding 7b of the saturable transformer 7 is reduced. Accordingly, the inductance of the controlled winding 7a is increased, the primary current of the heater transformer 2 is reduced and the average value of the heater voltage can always be kept at a constant value.
JP12987479A 1979-10-11 1979-10-11 Power circuit for heater Pending JPS5654177A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12987479A JPS5654177A (en) 1979-10-11 1979-10-11 Power circuit for heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12987479A JPS5654177A (en) 1979-10-11 1979-10-11 Power circuit for heater

Publications (1)

Publication Number Publication Date
JPS5654177A true JPS5654177A (en) 1981-05-14

Family

ID=15020435

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12987479A Pending JPS5654177A (en) 1979-10-11 1979-10-11 Power circuit for heater

Country Status (1)

Country Link
JP (1) JPS5654177A (en)

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