JPS5585921A - Constant voltage power supply for automobile - Google Patents

Constant voltage power supply for automobile

Info

Publication number
JPS5585921A
JPS5585921A JP15738978A JP15738978A JPS5585921A JP S5585921 A JPS5585921 A JP S5585921A JP 15738978 A JP15738978 A JP 15738978A JP 15738978 A JP15738978 A JP 15738978A JP S5585921 A JPS5585921 A JP S5585921A
Authority
JP
Japan
Prior art keywords
voltage
inverting input
operational amplifier
amplifier
output
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
JP15738978A
Other languages
Japanese (ja)
Inventor
Akira Teragakinai
Yasunori Mori
Tomoyuki Okada
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 JP15738978A priority Critical patent/JPS5585921A/en
Publication of JPS5585921A publication Critical patent/JPS5585921A/en
Pending legal-status Critical Current

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  • Continuous-Control Power Sources That Use Transistors (AREA)

Abstract

PURPOSE: To enable to output reset signal, by the comparison amplifying between the output voltage of error amplifier and the reference voltage lower by a given value than the power output voltage.
CONSTITUTION: When a voltage lower than the control voltage is fed to the emitter of the transistor 1, the inverting input voltage of the operational amplifier 4 is lower than the non-inverting input voltage. Accordingly, the operational amplifier 4 outputs the lower voltage than the power supply voltage by the value determined with the characteristics. This voltage charges the capacitor 16 via the resistor 14 and the diode 15 and it is fed to the non-inverting input terminal of the operational amplifier 13. In this case, due to the reset signal output of the microcomputer, the inverting input voltage of the amplifier 13 should be lower than the non-inverting input voltage. When the emitter voltage of the transistor 1 is more than the control voltage, the output voltage of the operational amplifier 4 is almost at ground potential. Further, the voltage across the capacitor 16 is discharged through the resistor 17, the non-inverting input voltage of the amplifier 13 is lower than the inverting input voltage for a time elapsed, and the reset signal is outputted.
COPYRIGHT: (C)1980,JPO&Japio
JP15738978A 1978-12-22 1978-12-22 Constant voltage power supply for automobile Pending JPS5585921A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15738978A JPS5585921A (en) 1978-12-22 1978-12-22 Constant voltage power supply for automobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15738978A JPS5585921A (en) 1978-12-22 1978-12-22 Constant voltage power supply for automobile

Publications (1)

Publication Number Publication Date
JPS5585921A true JPS5585921A (en) 1980-06-28

Family

ID=15648563

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15738978A Pending JPS5585921A (en) 1978-12-22 1978-12-22 Constant voltage power supply for automobile

Country Status (1)

Country Link
JP (1) JPS5585921A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373874A (en) * 1986-07-10 1988-04-04 ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Circuit device for supplying current to electronic equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6373874A (en) * 1986-07-10 1988-04-04 ドイチエ・トムソン−ブラント・ゲゼルシヤフト・ミツト・ベシユレンクテル・ハフツング Circuit device for supplying current to electronic equipment

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