JPS5585921A - Constant voltage power supply for automobile - Google Patents
Constant voltage power supply for automobileInfo
- 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
Links
Landscapes
- 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
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)
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 |
-
1978
- 1978-12-22 JP JP15738978A patent/JPS5585921A/en active Pending
Cited By (1)
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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