CN105305822A - Voltage stabilizing circuit with short-circuit protection function - Google Patents
Voltage stabilizing circuit with short-circuit protection function Download PDFInfo
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- CN105305822A CN105305822A CN201510722536.9A CN201510722536A CN105305822A CN 105305822 A CN105305822 A CN 105305822A CN 201510722536 A CN201510722536 A CN 201510722536A CN 105305822 A CN105305822 A CN 105305822A
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Abstract
The invention discloses a voltage stabilizing circuit with a short-circuit protection function, and relates to the technical field of a protection circuit applying a triode or transistor type device needing continuous application of control signals. The voltage stabilizing circuit comprises a voltage stabilizing chip U1, the input end of the voltage stabilizing U1 is a DC input anode P1 and a DC input cathode P2, the input end of the voltage stabilizing chip U1 is connected in parallel with a capacitor C1, the DC output end of the voltage stabilizing chip U1 is connected in parallel with a capacitor C2, and the voltage stabilizing circuit further comprises a short-circuit protection circuit composed of a triode Q1, a shunting reference voltage source SHR1, capacitors C3-C4 and resistors R2-R6. The output end of the voltage stabilizing circuit is provided with the short-circuit protection circuit. When an output anode P3 and an output cathode P4 are short-circuited, it can be ensured that no large currents flow through the output end, and the voltage stabilizing chip U1 is protected from heating damage.
Description
Technical field
The present invention relates to the protective circuit technical field that application needs to use continuously the triode of control signal or the device of transistor type, particularly relate to a kind of direct current regulation circuit with short-circuit protection function.
Background technology
The circuit that output voltage still can be kept constant when input voltage, load, ambient temperature, circuit parameter etc. change is voltage stabilizing circuit, and this circuit can provide galvanic current source, and widely various electronic equipment adopted.The sorting technique of voltage stabilizing circuit is various, and dividing by the type of out-put supply has direct current regulation circuit and AC voltage-stabilizing circuit; Divide by the connected mode of voltage stabilizing circuit and load and have serial regulating circuit and shunt regulating circuit; Linear voltage stabilizing circuit and switch voltage-stabilizing circuit is divided by the operating state of Correctional tube; Divide by circuit types and have simple voltage stabilizing circuit and feedback-type voltage stabilizing circuit, etc.As shown in Figure 1, be a kind of direct current regulation circuit of prior art, if in output cathode P3 and output negative pole P4 place's short circuit, because voltage stabilizing circuit does not exist short-circuit protection function, so voltage stabilizing chip U1 is easy to burn out.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of voltage stabilizing circuit with short-circuit protection function; the output of described voltage stabilizing circuit is provided with short-circuit protection circuit; as output cathode P3 and output negative pole P4 short circuit; can ensure that output flows through without big current; voltage stabilizing chip U1 is protected, prevents its heating from damaging.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of voltage stabilizing circuit with short-circuit protection function, comprise voltage stabilizing chip U1, the input of described voltage stabilizing chip U1 is direct current input positive pole P1 and direct current input negative pole P2, the input of described voltage stabilizing chip U1 is parallel with electric capacity C1, the DC output end of described voltage stabilizing chip U1 is parallel with electric capacity C2, it is characterized in that: described voltage stabilizing circuit also comprises triode Q1, the emitter of triode Q1 is connected with the DC output end of voltage stabilizing chip U1, one end of resistance R3 is connected with the emitter of triode Q1, the other end of resistance R3 is connected with one end of resistance R5, the other end of resistance R5 is connected with the direct current output cathode P3 of described voltage stabilizing circuit, the emitter of the one termination triode Q1 of resistance R4, the base stage of another termination triode Q1 of resistance R4, the base stage of triode Q1 is connected with the negative electrode of shunting reference voltage source SHR1, the plus earth of shunting reference voltage source SHR1, one end ground connection of resistance R2, the other end connecting resistance R3 of resistance R2 and the node of resistance R5, electric capacity C4 is in parallel with resistance R2, the reference pole connecting resistance R3 of shunting reference voltage source SHR1 and the node of resistance R5, one end of electric capacity C3 is divided into two-way, and the positive pole P3 that the first via and direct current export is connected, and the second tunnel is connected with the collector electrode of triode Q1, the other end of electric capacity C3 is divided into two-way, first via ground connection, and the second tunnel is connected with the direct current output negative pole P4 of described voltage stabilizing circuit.
Further technical scheme is: described electric capacity C1-C3 is electrochemical capacitor.
Further technical scheme is: described triode Q1 is PNP type triode.
Further technical scheme is: the model of described shunting reference voltage source SHR1 is TL431.
The beneficial effect adopting technique scheme to produce is: when when direct current output cathode P3 and direct current output negative pole P4 place's short circuit, resistance R5 is by drop-down in parallel with resistance R2, shunting reference voltage source SHR1 is turned off, triode Q1 is also turned off, thus direct current output cathode P3 and direct current output negative pole P4 passes through without big current, voltage stabilizing chip U1 generates heat seldom, can not be burned, and improves stability and the useful life of the operation of described voltage stabilizing circuit.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is the schematic diagram of prior art voltage stabilizing circuit;
Fig. 2 is the schematic diagram of voltage stabilizing circuit described in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only a part of embodiment of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Set forth a lot of detail in the following description so that fully understand the present invention, but the present invention can also adopt other to be different from alternate manner described here to implement, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention, therefore the present invention is by the restriction of following public specific embodiment.
As shown in Figure 2; the invention discloses a kind of voltage stabilizing circuit with short-circuit protection function; comprise voltage stabilizing chip U1; the input of described voltage stabilizing chip U1 is direct current input positive pole P1 and direct current input negative pole P2; the input of described voltage stabilizing chip U1 is parallel with electric capacity C1; the DC output end of described voltage stabilizing chip U1 is parallel with electric capacity C2, and above content is same as the prior art, does not repeat at this.
Inventive point of the present invention is: described voltage stabilizing circuit also comprises triode Q1, described triode Q1 can use PNP type triode, the emitter of triode Q1 is connected with the DC output end of voltage stabilizing chip U1, one end of resistance R3 is connected with the emitter of triode Q1, the other end of resistance R3 is connected with one end of resistance R5, the other end of resistance R5 is connected with the direct current output cathode P3 of described voltage stabilizing circuit, the emitter of the one termination triode Q1 of resistance R4, the base stage of another termination triode Q1 of resistance R4, the base stage of triode Q1 is connected with the negative electrode of shunting reference voltage source SHR1, the plus earth of shunting reference voltage source SHR1, described shunting reference voltage source SHR1 can use TL431, one end ground connection of resistance R2, the other end connecting resistance R3 of resistance R2 and the node of resistance R5, electric capacity C4 is in parallel with resistance R2, the reference pole connecting resistance R3 of shunting reference voltage source SHR1 and the node of resistance R5, one end of electric capacity C3 is divided into two-way, and the positive pole P3 that the first via and direct current export is connected, and the second tunnel is connected with the collector electrode of triode Q1, the other end of electric capacity C3 is divided into two-way, first via ground connection, and the second tunnel is connected with the direct current output negative pole P4 of described voltage stabilizing circuit, and described electric capacity C1-C3 can use electrochemical capacitor.
It is to be noted, list the model of some components and parts in the present embodiment, it is pointed out that the explanation of cited model just to the application, do not form the restriction to the application, those skilled in the art can select according to actual needs and anyly can meet the circuit components do not applied for.
During normal work, shunting reference voltage source SHR1 and triode Q1 conducting, voltage stabilizing chip U1 directly exports constant voltage dc source; When direct current output cathode P3 and direct current output negative pole P4 place's short circuit, resistance R5 is by drop-down in parallel with resistance R2, shunting reference voltage source SHR1 is turned off, triode Q1 is also turned off, thus direct current output cathode P3 and direct current output negative pole P4 passes through without big current, voltage stabilizing chip U1 generates heat seldom, can not be burned, and improves stability and the useful life of the operation of described voltage stabilizing circuit.
Claims (4)
1. one kind has the voltage stabilizing circuit of short-circuit protection function, comprise voltage stabilizing chip U1, the input of described voltage stabilizing chip U1 is direct current input positive pole P1 and direct current input negative pole P2, the input of described voltage stabilizing chip U1 is parallel with electric capacity C1, the DC output end of described voltage stabilizing chip U1 is parallel with electric capacity C2, it is characterized in that: described voltage stabilizing circuit also comprises triode Q1, the emitter of triode Q1 is connected with the DC output end of voltage stabilizing chip U1, one end of resistance R3 is connected with the emitter of triode Q1, the other end of resistance R3 is connected with one end of resistance R5, the other end of resistance R5 is connected with the direct current output cathode P3 of described voltage stabilizing circuit, the emitter of the one termination triode Q1 of resistance R4, the base stage of another termination triode Q1 of resistance R4, the base stage of triode Q1 is connected with the negative electrode of shunting reference voltage source SHR1, the plus earth of shunting reference voltage source SHR1, one end ground connection of resistance R2, the other end connecting resistance R3 of resistance R2 and the node of resistance R5, electric capacity C4 is in parallel with resistance R2, the reference pole connecting resistance R3 of shunting reference voltage source SHR1 and the node of resistance R5, one end of electric capacity C3 is divided into two-way, and the positive pole P3 that the first via and direct current export is connected, and the second tunnel is connected with the collector electrode of triode Q1, the other end of electric capacity C3 is divided into two-way, first via ground connection, and the second tunnel is connected with the direct current output negative pole P4 of described voltage stabilizing circuit.
2. the voltage stabilizing circuit with short-circuit protection function according to claim 1, is characterized in that: described electric capacity C1-C3 is electrochemical capacitor.
3. the voltage stabilizing circuit with short-circuit protection function according to claim 1, is characterized in that: described triode Q1 is PNP type triode.
4. the voltage stabilizing circuit with short-circuit protection function according to claim 1, is characterized in that: the model of described shunting reference voltage source SHR1 is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510722536.9A CN105305822B (en) | 2015-10-31 | 2015-10-31 | A kind of direct current regulation circuit with short-circuit protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510722536.9A CN105305822B (en) | 2015-10-31 | 2015-10-31 | A kind of direct current regulation circuit with short-circuit protection function |
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| Publication Number | Publication Date |
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| CN105305822A true CN105305822A (en) | 2016-02-03 |
| CN105305822B CN105305822B (en) | 2018-08-10 |
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| CN201510722536.9A Active CN105305822B (en) | 2015-10-31 | 2015-10-31 | A kind of direct current regulation circuit with short-circuit protection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655745A (en) * | 2017-01-13 | 2017-05-10 | 杭州优特电源有限公司 | Switching power supply output short-circuit protection circuit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20070052992A (en) * | 2005-11-18 | 2007-05-23 | 엘지이노텍 주식회사 | Power protection circuit |
| CN203218857U (en) * | 2013-01-18 | 2013-09-25 | 武汉迈威光电技术有限公司 | Overvoltage protection circuit |
| CN104167911A (en) * | 2013-05-16 | 2014-11-26 | 海洋王（东莞）照明科技有限公司 | Voltage boost protection circuit |
| CN204557275U (en) * | 2015-05-07 | 2015-08-12 | 韩志根 | A kind of D.C. regulated power supply protection circuit |
| CN205195561U (en) * | 2015-10-31 | 2016-04-27 | 广东新昇电业科技股份有限公司 | Voltage stabilizing circuit with short -circuit protection function |
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2015
- 2015-10-31 CN CN201510722536.9A patent/CN105305822B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070052992A (en) * | 2005-11-18 | 2007-05-23 | 엘지이노텍 주식회사 | Power protection circuit |
| CN203218857U (en) * | 2013-01-18 | 2013-09-25 | 武汉迈威光电技术有限公司 | Overvoltage protection circuit |
| CN104167911A (en) * | 2013-05-16 | 2014-11-26 | 海洋王（东莞）照明科技有限公司 | Voltage boost protection circuit |
| CN204557275U (en) * | 2015-05-07 | 2015-08-12 | 韩志根 | A kind of D.C. regulated power supply protection circuit |
| CN205195561U (en) * | 2015-10-31 | 2016-04-27 | 广东新昇电业科技股份有限公司 | Voltage stabilizing circuit with short -circuit protection function |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655745A (en) * | 2017-01-13 | 2017-05-10 | 杭州优特电源有限公司 | Switching power supply output short-circuit protection circuit |
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| CN105305822B (en) | 2018-08-10 |
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