CN203387159U - Short circuit protection circuit of triode voltage stabilizing circuit - Google Patents
Short circuit protection circuit of triode voltage stabilizing circuit Download PDFInfo
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- CN203387159U CN203387159U CN201320517712.1U CN201320517712U CN203387159U CN 203387159 U CN203387159 U CN 203387159U CN 201320517712 U CN201320517712 U CN 201320517712U CN 203387159 U CN203387159 U CN 203387159U
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- voltage stabilizing
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- triode
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- stabilizing circuit
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- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 68
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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Abstract
The utility model relates to a short circuit protection circuit of a triode voltage stabilizing circuit. The circuit comprises a first resistor connected with an input terminal of the voltage stabilizing circuit, a second resistor connected with an output terminal of the voltage stabilizing circuit, and a triode. The other end of the first resistor and the other end of the second resistor are both connected with the base electrode of the triode. The collector electrode of the triode is connected with the base electrode of a voltage stabilizing triode in the voltage stabilizing circuit. The emitter electrode of the triode is connected with the output terminal of the voltage stabilizing circuit. The voltage stabilizing circuit comprises the voltage stabilizing triode and a voltage stabilizing diode. The voltage stabilizing terminal of the voltage stabilizing diode is connected with the base electrode of the voltage stabilizing triode and simultaneously connected with an input power supply through a current-limiting resistor, while the other terminal of the voltage stabilizing diode is grounded. The collector electrode of the voltage stabilizing triode is taken as the input terminal of the voltage stabilizing circuit and connected with the input power supply, while the emitter electrode of the voltage stabilizing triode is taken as the output terminal of the voltage stabilizing circuit. According to the utility model, the short circuit protection effect can be realized by only adding one triode and resistors into the triode voltage stabilizing circuit; and the short circuit protection circuit is low in price, high in reliability, and adapted to large-scale popularization and application.
Description
Technical field
The utility model relates to electronic circuit technology.
Background technology
The voltage stabilizing IC of professional integrated circuit is arranged on market, can be protected output short-circuit, but price is higher and will change different voltage stabilizing IC as exported different magnitudes of voltage.Adopt triode to build the voltage stabilizing circuit cost relatively low, but as while output short-circuit occurring, can burn triode and outlet line, have security risk.
Summary of the invention
For addressing the above problem, the utility model provides a kind of short-circuit protection circuit of triode voltage stabilizing circuit.
Technical solution adopted in the utility model is: a kind of short-circuit protection circuit of triode voltage stabilizing circuit; comprise the first resistance be connected with the voltage stabilizing circuit input, the second resistance be connected with circuit output end of pressure-stabilizing and a triode; described first, second resistance other end all is connected with this transistor base; this transistor collector connects voltage stabilizing transistor base in voltage stabilizing circuit, and emitter connects the output of voltage stabilizing circuit.
Described voltage stabilizing circuit comprises voltage stabilizing triode and voltage stabilizing didoe, and described voltage stabilizing didoe voltage stabilizing end connects the voltage stabilizing transistor base, connects input power, voltage stabilizing didoe other end ground connection by current limliting the 3rd simultaneously; Described voltage stabilizing transistor collector connects input power as the voltage stabilizing circuit input, and emitter is as circuit output end of pressure-stabilizing.
The utility model only increases a triode on the triode voltage stabilizing circuit and resistance just can be realized the short-circuit protection effect, cheap, reliability is high, is suitable for applying in enormous quantities.Increase short-circuit protection on common triode voltage stabilizing circuit, play the effect of the triode in the protection voltage stabilizing circuit, unlikely damage during protection voltage stabilizing triode output short-circuit, and can protect output power supply circuit, reduce potential safety hazard.
The accompanying drawing explanation
Fig. 1 is the utility model embodiment circuit theory diagrams.
Embodiment
Understand technology contents of the present utility model for convenience of those skilled in the art, below in conjunction with drawings and Examples, the utility model is described in further detail.
As shown in Figure 1, the described triode voltage stabilizing circuit of the present embodiment comprises voltage stabilizing triode Q1 and voltage stabilizing didoe Z1, and wherein, voltage stabilizing didoe Z1 voltage stabilizing end connects voltage stabilizing triode Q1 base stage, connect input power, voltage stabilizing didoe Z1 other end ground connection by current-limiting resistance R4 simultaneously; Described voltage stabilizing triode Q1 collector electrode connects input power as the voltage stabilizing circuit input, and emitter is as circuit output end of pressure-stabilizing.
The short-circuit protection circuit that the utility model increases comprises resistance R 1, R2 and triode Q2; wherein; resistance R 1 one ends are connected with the voltage stabilizing circuit input; resistance R 2 one ends are connected with circuit output end of pressure-stabilizing; resistance R 1, the R2 other end all are connected with triode Q2 base stage; triode Q2 collector electrode connects voltage stabilizing triode Q1 base stage, and triode Q2 emitter connects circuit output end of pressure-stabilizing.
As figure, if do not added short-circuit protection circuit, when the output voltage short circuit, can cause the circuit of triode Q1 damage or output voltage to damage, cause security risk.After adding short-circuit protection circuit, during work, triode Q2 is in cut-off state, the voltage of voltage regulation that the base voltage of triode Q1 is voltage stabilizing didoe Z1, triode Q1 normal operation.When triode Q2 saturation conduction of short circuit appears in output end voltage VCC_OUT, make triode Q1 base stage become low level, triode Q1 cut-off, and then voltage stabilizing circuit quits work and do not export output, played protective effect.
Above-described embodiment is only preferably implementation of the utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection range of the present utility model.
Claims (2)
1. the short-circuit protection circuit of a triode voltage stabilizing circuit; it is characterized in that: comprise the resistance R 1 be connected with the voltage stabilizing circuit input, the resistance R 2 be connected with circuit output end of pressure-stabilizing and triode Q2; resistance R 1, the R2 other end all are connected with triode Q2 base stage; described triode Q2 collector electrode connects voltage stabilizing triode Q1 base stage, and triode Q2 emitter connects circuit output end of pressure-stabilizing.
2. the short-circuit protection circuit of triode voltage stabilizing circuit according to claim 1, it is characterized in that: described voltage stabilizing circuit comprises voltage stabilizing triode Q1 and voltage stabilizing didoe Z1, described voltage stabilizing didoe Z1 voltage stabilizing end connects voltage stabilizing triode Q1 base stage, connect input power, voltage stabilizing didoe Z1 other end ground connection by current-limiting resistance R4 simultaneously; Described voltage stabilizing triode Q1 collector electrode connects input power as the voltage stabilizing circuit input, and emitter is as circuit output end of pressure-stabilizing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320517712.1U CN203387159U (en) | 2013-08-23 | 2013-08-23 | Short circuit protection circuit of triode voltage stabilizing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320517712.1U CN203387159U (en) | 2013-08-23 | 2013-08-23 | Short circuit protection circuit of triode voltage stabilizing circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203387159U true CN203387159U (en) | 2014-01-08 |
Family
ID=49875609
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320517712.1U Expired - Fee Related CN203387159U (en) | 2013-08-23 | 2013-08-23 | Short circuit protection circuit of triode voltage stabilizing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203387159U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578782A (en) * | 2015-01-15 | 2015-04-29 | 哈尔滨电工仪表研究所 | Module special for carrier power source of electric energy meter |
| CN108258772A (en) * | 2018-02-11 | 2018-07-06 | 成都兴联宜科技有限公司 | A kind of power supply module of AGV trolleies |
-
2013
- 2013-08-23 CN CN201320517712.1U patent/CN203387159U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104578782A (en) * | 2015-01-15 | 2015-04-29 | 哈尔滨电工仪表研究所 | Module special for carrier power source of electric energy meter |
| CN108258772A (en) * | 2018-02-11 | 2018-07-06 | 成都兴联宜科技有限公司 | A kind of power supply module of AGV trolleies |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 516006 Guangdong city of Huizhou province and Zhongkai hi tech Industrial Development Zone Five West Road No. 103 Patentee after: HUIZHOU DESAY SV AUTOMOTIVE Co.,Ltd. Address before: 516006 Guangdong city of Huizhou province and Zhongkai hi tech Industrial Development Zone Five West Road No. 103 Patentee before: HUIZHOU DESAY SV AUTOMOTIVE Co.,Ltd. |
|
| 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: 20140108 Termination date: 20210823 |