CN204906185U - Constant voltage power supply - Google Patents
Constant voltage power supply Download PDFInfo
- Publication number
- CN204906185U CN204906185U CN201520695720.4U CN201520695720U CN204906185U CN 204906185 U CN204906185 U CN 204906185U CN 201520695720 U CN201520695720 U CN 201520695720U CN 204906185 U CN204906185 U CN 204906185U
- Authority
- CN
- China
- Prior art keywords
- type triode
- pnp type
- power supply
- voltage power
- stabilized voltage
- 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.)
- Expired - Fee Related
Links
Abstract
The utility model discloses a constant voltage power supply, PNP type triode T1's projecting pole connects the constant voltage power supply input terminal, T1's collecting electrode connects to ground through resistance R1 and the emitting diode LED1 who establishes ties, T1's base is connected with T2's base through resistance R2, T2's projecting pole connects the constant voltage power supply input terminal, T2's collecting electrode connects to three terminal regulator IC's input through resistance R5, not IC's ground connection termination to ground, constant voltage power supply output terminal is drawn forth to IC's output, T3's collecting electrode and constant voltage power supply output terminal are connected, T3's base is connected with T2's collecting electrode, T3's projecting pole connects the input terminal to constant voltage power supply through resistance R3, and T3's projecting pole is connected with T2's base, resistance R4 connects between T2's collecting electrode and T2's projecting pole, electric capacity C1 connects between constant voltage power supply input terminal and ground, electric capacity C2 connects between constant voltage power supply output terminal and ground. The utility model discloses the three terminal regulator's that flows through electric current can be restricted, the purpose of protecting three terminal regulator is played from this.
Description
Technical field
The utility model relates to power circuit, particularly a kind of stabilized voltage power supply.
Background technology
Three terminal regulator is a kind of common integrated circuit, by building peripheral circuit, can make stabilized voltage power supply.This stabilized voltage power supply can use high power transistor to expand stream usually, to obtain larger output current, but this also can cause flowing through three terminal regulator comparatively greatly, causes adverse effect thus to three terminal regulator.
Utility model content
In view of this, the purpose of this utility model is the simple stabilized voltage power supply of a kind of structure, can limit flow through three terminal regulator electric current to protect three terminal regulator.
For solving the problems of the technologies described above, the utility model provides a kind of stabilized voltage power supply, comprise three terminal regulator IC and PNP type triode T1, PNP type triode T2 and PNP type triode T3, the emitter of PNP type triode T1 connects stabilized voltage power supply input terminal, the collector electrode of PNP type triode T1 is connected to ground through the resistance R1 of series connection and LED 1, the base stage of PNP type triode T1 is connected with the base stage of PNP type triode T2 through resistance R2, the emitter of PNP type triode T2 connects stabilized voltage power supply input terminal, the collector electrode of PNP type triode T2 is connected to the input of three terminal regulator IC through resistance R5, the earth terminal of three terminal regulator IC is connected to ground, the output of three terminal regulator IC draws output end of stabilized voltage supply, the collector electrode of PNP type triode T3 and output end of stabilized voltage supply sub-connection, the base stage of PNP type triode T3 is connected with the collector electrode of PNP type triode T2, the emitter of PNP type triode T3 is connected to stabilized voltage power supply input terminal through resistance R3, and the emitter of PNP type triode T3 is connected with the base stage of PNP type triode T2, resistance R4 is connected between the collector electrode of PNP type triode T2 and the emitter of PNP type triode T2, electric capacity C1 is connected between stabilized voltage power supply input terminal and ground, electric capacity C2 is connected between output end of stabilized voltage supply and ground.
Wherein, PNP type triode T3 is flange-cooled high power transistor, and three terminal regulator IC selects 7805.
Compared with prior art; the utility model devises the simple stabilized voltage power supply of a kind of circuit structure; it uses a flange-cooled high power transistor to carry out expansion stream to three terminal regulator; when little load by three terminal regulator to load supplying; power by expanding stream transistor when output current is larger; the electric current flowing through three terminal regulator can be limited like this, play the object of protection three terminal regulator thus.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of the utility model stabilized voltage power supply.
Embodiment
In order to make those skilled in the art understand the technical solution of the utility model better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
See Fig. 1, it is the circuit diagram of the utility model stabilized voltage power supply.This stabilized voltage power supply comprises three terminal regulator IC (type selecting is 7805) and comprises PNP type triode T1, the peripheral circuit that PNP type triode T2 and PNP type triode T3 is formed, wherein: the emitter of PNP type triode T1 meets stabilized voltage power supply input terminal Vin (as+10V), the collector electrode of PNP type triode T1 is connected to ground through the resistance R1 of series connection and LED 1, the base stage of PNP type triode T1 is connected with the base stage of PNP type triode T2 through resistance R2, the emitter of PNP type triode T2 meets stabilized voltage power supply input terminal Vin, the collector electrode of PNP type triode T2 is connected to the input of three terminal regulator IC through resistance R5, the earth terminal of three terminal regulator IC is connected to ground, the output of three terminal regulator IC draws the sub-Vo of output end of stabilized voltage supply (as 3A/5V), the collector electrode of PNP type triode T3 is connected with the sub-Vo of output end of stabilized voltage supply, the base stage of PNP type triode T3 is connected with the collector electrode of PNP type triode T2, the emitter of PNP type triode T3 is connected to stabilized voltage power supply input terminal Vin through resistance R3, and the emitter of PNP type triode T3 is connected with the base stage of PNP type triode T2, resistance R4 is connected between the collector electrode of PNP type triode T2 and the emitter of PNP type triode T2, electric capacity C1 is connected between stabilized voltage power supply input terminal Vin and ground, electric capacity C2 is connected between the sub-Vo of output end of stabilized voltage supply and ground.
The operation principle of this stabilized voltage power supply is: use a flange-cooled high power transistor (PNP type triode T3) to carry out expansion stream to three terminal regulator, when little load by three terminal regulator to load supplying, when output current is larger (as more than 15mA) by expansion stream transistor power.Be specially: when output current is greater than 15mA, the pressure drop on resistance R4 causes PNP type triode T3 conducting, and PNP type triode T2 is output overloading or short-circuit protection pipe.When the electric current flowing through PNP type triode T3 is greater than 3A, the upper pressure drop of R3 makes PNP type triode T2 conducting, limits the emitter junction voltage of PNP type triode T3, and the electric current flowing through PNP type triode T3 is maintained in certain numerical value.The PNP type triode T1 in parallel with PNP type triode T2 lights light-emitting diode when protective circuit action and makes instruction.R5 is used for limiting the electric current flowing through three terminal regulator IC when protective circuit works, because now PNP type triode T2 is shorted, if do not access R5 to flow through end pressurizer IC with regard to having very large electric current.
Although the utility model with preferred embodiment openly as above; but it is not for limiting the utility model; any those skilled in the art are not departing from spirit and scope of the present utility model; can make possible variation and amendment, the scope that therefore protection range of the present utility model should define with the utility model claim is as the criterion.
Claims (3)
1. a stabilized voltage power supply, it is characterized in that, comprise three terminal regulator IC and PNP type triode T1, PNP type triode T2 and PNP type triode T3, the emitter of PNP type triode T1 connects stabilized voltage power supply input terminal, the collector electrode of PNP type triode T1 is connected to ground through the resistance R1 of series connection and LED 1, the base stage of PNP type triode T1 is connected with the base stage of PNP type triode T2 through resistance R2, the emitter of PNP type triode T2 connects stabilized voltage power supply input terminal, the collector electrode of PNP type triode T2 is connected to the input of three terminal regulator IC through resistance R5, the earth terminal of three terminal regulator IC is connected to ground, the output of three terminal regulator IC draws output end of stabilized voltage supply, the collector electrode of PNP type triode T3 and output end of stabilized voltage supply sub-connection, the base stage of PNP type triode T3 is connected with the collector electrode of PNP type triode T2, the emitter of PNP type triode T3 is connected to stabilized voltage power supply input terminal through resistance R3, and the emitter of PNP type triode T3 is connected with the base stage of PNP type triode T2, resistance R4 is connected between the collector electrode of PNP type triode T2 and the emitter of PNP type triode T2, electric capacity C1 is connected between stabilized voltage power supply input terminal and ground, electric capacity C2 is connected between output end of stabilized voltage supply and ground.
2. stabilized voltage power supply as claimed in claim 1, it is characterized in that, PNP type triode T3 is flange-cooled high power transistor.
3. stabilized voltage power supply as claimed in claim 2, it is characterized in that, three terminal regulator IC selects 7805.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520695720.4U CN204906185U (en) | 2015-09-09 | 2015-09-09 | Constant voltage power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520695720.4U CN204906185U (en) | 2015-09-09 | 2015-09-09 | Constant voltage power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204906185U true CN204906185U (en) | 2015-12-23 |
Family
ID=54928330
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520695720.4U Expired - Fee Related CN204906185U (en) | 2015-09-09 | 2015-09-09 | Constant voltage power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204906185U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106130345A (en) * | 2016-08-29 | 2016-11-16 | 合肥惠科金扬科技有限公司 | A kind of anti-power failure liquid crystal display screen power supply |
| CN106208691A (en) * | 2016-08-29 | 2016-12-07 | 合肥惠科金扬科技有限公司 | A kind of liquid crystal display screen power supply |
| CN106300971A (en) * | 2016-08-29 | 2017-01-04 | 合肥惠科金扬科技有限公司 | A kind of driving mu balanced circuit of liquid crystal display module |
| WO2017128207A1 (en) * | 2016-01-28 | 2017-08-03 | 深圳瀚飞科技开发有限公司 | Automatic-reset voltage stabilizing circuit |
-
2015
- 2015-09-09 CN CN201520695720.4U patent/CN204906185U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017128207A1 (en) * | 2016-01-28 | 2017-08-03 | 深圳瀚飞科技开发有限公司 | Automatic-reset voltage stabilizing circuit |
| CN106130345A (en) * | 2016-08-29 | 2016-11-16 | 合肥惠科金扬科技有限公司 | A kind of anti-power failure liquid crystal display screen power supply |
| CN106208691A (en) * | 2016-08-29 | 2016-12-07 | 合肥惠科金扬科技有限公司 | A kind of liquid crystal display screen power supply |
| CN106300971A (en) * | 2016-08-29 | 2017-01-04 | 合肥惠科金扬科技有限公司 | A kind of driving mu balanced circuit of liquid crystal display module |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN204906185U (en) | Constant voltage power supply | |
| CN101778513B (en) | LED flow equalizing control circuit, LED driver module and navigation aiding light | |
| CN103474954B (en) | A kind of overvoltage based on three end adjustable shunt reference sources and under-voltage protecting circuit | |
| CN102856892A (en) | Power supply | |
| CN106533144B (en) | Anti-reverse and current flowing backwards circuit | |
| CN203368019U (en) | Overvoltage protection circuit for AC directly driven LED circuit | |
| CN204376382U (en) | For the protective circuit of LED high-voltage light bar | |
| CN204498405U (en) | Based on the LED drive system that bootstrapping controls | |
| CN203279303U (en) | A large-power LED driver and a boost converter protection circuit thereof | |
| CN106300269A (en) | A kind of type voltage regulation overcurrent power-off indicating circuit | |
| CN202696134U (en) | Power supply | |
| CN204994022U (en) | Utilize triode BE knot voltage to realize LED lighting device | |
| CN207530535U (en) | A kind of voltage control circuit for automatic transfer switch controller | |
| CN202602243U (en) | LED (Light-Emitting Diode) illumination power supply protection circuit | |
| CN204720978U (en) | Power supply switch circuit and electronic equipment | |
| CN203217478U (en) | Microcomputer power supply circuit for energy storage system | |
| CN204721685U (en) | The LED illumination drive circuit of switch can be realized | |
| CN204668912U (en) | A kind of protective circuit | |
| CN204190378U (en) | A kind of wire harness winding inserter drive system with over-voltage over-current protection | |
| CN204464939U (en) | A kind of electronic type self-recoverage insurance circuit | |
| CN209046241U (en) | One kind 3.7 is to 4.2V intrinsically safe circuit | |
| CN205195544U (en) | Adopt three terminal regulator's constant voltage power supply | |
| CN203851029U (en) | Power supply circuit of intelligent interactive terminal | |
| CN206790084U (en) | One kind output band current-limiting protection circuit | |
| CN206602353U (en) | A kind of circuit overcurrent protection |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151223 Termination date: 20160909 |