JPS5785111A - Reference constant voltage power supply - Google Patents
Reference constant voltage power supplyInfo
- Publication number
- JPS5785111A JPS5785111A JP16172780A JP16172780A JPS5785111A JP S5785111 A JPS5785111 A JP S5785111A JP 16172780 A JP16172780 A JP 16172780A JP 16172780 A JP16172780 A JP 16172780A JP S5785111 A JPS5785111 A JP S5785111A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- load
- current
- level
- power supply
- 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
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F3/00—Non-retroactive systems for regulating electric variables by using an uncontrolled element, or an uncontrolled combination of elements, such element or such combination having self-regulating properties
- G05F3/02—Regulating voltage or current
- G05F3/08—Regulating voltage or current wherein the variable is dc
- G05F3/10—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics
- G05F3/16—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices
- G05F3/18—Regulating voltage or current wherein the variable is dc using uncontrolled devices with non-linear characteristics being semiconductor devices using Zener diodes
Abstract
PURPOSE:To protect a load circuit, by obtaining the constant voltage through a simple circuit to a large extent of fluctuation of the input voltage and at the same time setting the internal impedance at a high level in case the current higher than the reference voltage flows to the load in order to maintain the voltage of a level equivalent to the load current. CONSTITUTION:The polarity is opposite between input power supply terminals a1 and a2 of the two circuits which ar shown in th diagram. The current supplied through the terminal a1 flows to a resistance R3 through a Zener diode DZ1, and the voltage is applied to the base of a transistor TRQ1 for operation. Thus a positive feedback loop is completed, and the current which is almost constant level flows to the collectors of TRQ1 and TRQ2. Thus the Zener voltage is finally stabilized at Zener diodes DZ1 and DZ2. As a result, the stabilizer voltage of the diode DZ2 emerges between output power supply terminals b1 and b2 to supply the constant voltage to a load. In case a fault arises at a load circuit to flow the current higher than the reference level, the positive feedback loop disappears to increase the internal impedance. Thus the voltage of supply is reduced down to a level equivalent to a load current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16172780A JPS5785111A (en) | 1980-11-17 | 1980-11-17 | Reference constant voltage power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16172780A JPS5785111A (en) | 1980-11-17 | 1980-11-17 | Reference constant voltage power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5785111A true JPS5785111A (en) | 1982-05-27 |
Family
ID=15740731
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16172780A Pending JPS5785111A (en) | 1980-11-17 | 1980-11-17 | Reference constant voltage power supply |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5785111A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5265161A (en) * | 1989-11-07 | 1993-11-23 | Deutsche Thomson-Brandt Gmbh | Process and device for activating a chip card |
-
1980
- 1980-11-17 JP JP16172780A patent/JPS5785111A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5265161A (en) * | 1989-11-07 | 1993-11-23 | Deutsche Thomson-Brandt Gmbh | Process and device for activating a chip card |
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