JPS5654176A - Power circuit for heater - Google Patents

Power circuit for heater

Info

Publication number
JPS5654176A
JPS5654176A JP12987379A JP12987379A JPS5654176A JP S5654176 A JPS5654176 A JP S5654176A JP 12987379 A JP12987379 A JP 12987379A JP 12987379 A JP12987379 A JP 12987379A JP S5654176 A JPS5654176 A JP S5654176A
Authority
JP
Japan
Prior art keywords
voltage
heater
decreased
transformer
winding
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
JP12987379A
Other languages
Japanese (ja)
Other versions
JPS624034B2 (en
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 JP12987379A priority Critical patent/JPS5654176A/en
Publication of JPS5654176A publication Critical patent/JPS5654176A/en
Publication of JPS624034B2 publication Critical patent/JPS624034B2/ja
Granted 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

Abstract

PURPOSE:To make stable the heater voltage, by comparing the average variation voltage of a heater transformer with a given voltage obtained at a constant voltage diode, and applying the voltage difference to the control winding of a saturable transformer. CONSTITUTION:The flyback pulse based on various variance produced on a variation voltage detecting winding 8 is detected at an average detection circuit 21 and fed to the base of an error amplification transistor TR18 via a sensitivity adjusting variable resistor 17. In this case, when the average value of the pulse increases, the base voltage is increased and the collector voltage is decreased. Accordingly, the base voltage of TR19 is decreased and the collector current is decreased. Thus, the control current flowing to the control winding 7b of the saturable transformer 7 is decreased. Accordingly, the inductance of the controlled winding 7a is increased and the primary current of the heater transformer 2 is reduced. Thus, the average value of the heater voltage can always keep a constant value.
JP12987379A 1979-10-11 1979-10-11 Power circuit for heater Granted JPS5654176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12987379A JPS5654176A (en) 1979-10-11 1979-10-11 Power circuit for heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12987379A JPS5654176A (en) 1979-10-11 1979-10-11 Power circuit for heater

Publications (2)

Publication Number Publication Date
JPS5654176A true JPS5654176A (en) 1981-05-14
JPS624034B2 JPS624034B2 (en) 1987-01-28

Family

ID=15020409

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12987379A Granted JPS5654176A (en) 1979-10-11 1979-10-11 Power circuit for heater

Country Status (1)

Country Link
JP (1) JPS5654176A (en)

Also Published As

Publication number Publication date
JPS624034B2 (en) 1987-01-28

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