JPS5775325A - Power supply circuit - Google Patents

Power supply circuit

Info

Publication number
JPS5775325A
JPS5775325A JP15100380A JP15100380A JPS5775325A JP S5775325 A JPS5775325 A JP S5775325A JP 15100380 A JP15100380 A JP 15100380A JP 15100380 A JP15100380 A JP 15100380A JP S5775325 A JPS5775325 A JP S5775325A
Authority
JP
Japan
Prior art keywords
turned
voltage
load
accordingly
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
JP15100380A
Other languages
Japanese (ja)
Inventor
Keiichi Hori
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.)
Pioneer Corp
Original Assignee
Pioneer Corp
Pioneer Electronic Corp
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 Pioneer Corp, Pioneer Electronic Corp filed Critical Pioneer Corp
Priority to JP15100380A priority Critical patent/JPS5775325A/en
Publication of JPS5775325A publication Critical patent/JPS5775325A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
    • G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
    • G05F1/10—Regulating voltage or current
    • G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
    • G05F1/618—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series and in parallel with the load as final control devices

Abstract

PURPOSE:To eliminate the need for a heat sink and to realize the miniaturization of a device, by carrying out the control of electric power with the resistance. CONSTITUTION:When a rectified voltage VDC is lower than the Zener voltage VZD of a Zener diode ZD, the diode ZD is turned off. Accordingly, transistors (TR) Q4 and Q5 are also turned off, and thus a TRO3 is turned on to satisfy VDC VCC. When the voltage VDC becomes higher than the voltage VZD, the diode ZD is turned on. Accordingly, TRs Q4 and Q5 are also turned on. The TRQ3 is turned off with the ON of the TRQ4, and accordingly, a resistance R2 is connected in series to a load RL to perform the control of electric power. At the same time, a TRQ5 is also turned on and a series connection circuit comprising resistances R5 and R6 plus the TRQ5 is connected in parallel to the load RL to control the output voltage VCC. Then the value is set at a proper level for resistances R1, R4, R6 and R7, respectively. As a result, the voltage VCC can be kept at a certain level to some extent although the primary side input voltage of a transformer 1 has increment/decrement or the load RL has a fluctuation.
JP15100380A 1980-10-28 1980-10-28 Power supply circuit Pending JPS5775325A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15100380A JPS5775325A (en) 1980-10-28 1980-10-28 Power supply circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15100380A JPS5775325A (en) 1980-10-28 1980-10-28 Power supply circuit

Publications (1)

Publication Number Publication Date
JPS5775325A true JPS5775325A (en) 1982-05-11

Family

ID=15509156

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15100380A Pending JPS5775325A (en) 1980-10-28 1980-10-28 Power supply circuit

Country Status (1)

Country Link
JP (1) JPS5775325A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62108321A (en) * 1985-11-07 1987-05-19 Matsushita Electric Ind Co Ltd Power source circuit
WO2007142015A1 (en) * 2006-06-06 2007-12-13 Ricoh Company, Ltd. Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62108321A (en) * 1985-11-07 1987-05-19 Matsushita Electric Ind Co Ltd Power source circuit
WO2007142015A1 (en) * 2006-06-06 2007-12-13 Ricoh Company, Ltd. Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection ciruit
US7864495B2 (en) 2006-06-06 2011-01-04 Ricoh Company, Ltd. Excess voltage protection circuit, method of protecting a circuit from excess voltage, and semiconductor apparatus having the excess voltage protection circuit

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