CN204794007U - DC power supply circuit with short -circuit protection - Google Patents
DC power supply circuit with short -circuit protection Download PDFInfo
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- CN204794007U CN204794007U CN201520281010.7U CN201520281010U CN204794007U CN 204794007 U CN204794007 U CN 204794007U CN 201520281010 U CN201520281010 U CN 201520281010U CN 204794007 U CN204794007 U CN 204794007U
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Abstract
The utility model relates to a DC power supply circuit with short -circuit protection, including direct current voltage conversion module and short -circuit protection module, the input and the output of direct current voltage conversion module of short -circuit protection module are connected, export the input of termination direct current voltage conversion module, no -output is just often exported at direct current voltage conversion circuit to the short -circuit protection module, draws the control end voltage of low voltage conversion module when direct current voltage protection module output short circuit, makes direct current voltage conversion module stop work. Through in the DC power supply circuit arrangement short -circuit protection module, protect the DC power supply circuit when DC power supply output short circuit, prevent that the DC power supply circuit from burning out, and the short -circuit protection module comprises simple electronic components, circuit structure is simple, realizes with low costsly, just occupies smallly.
Description
Technical field
The utility model relates to technical field of direct current power, is specifically related to the DC power supply circuit with short-circuit protection.
Background technology
Traditional DC power supply adopts DC voltage converting circuit to carry out direct voltage conversion.DC voltage converting circuit adopts the framework of BUCK or BOOST circuit usually, and line construction is simple, and efficiency is high, and inside has slope-compensation.But traditional DC voltage converting circuit does not exist short-circuit protection mechanism, when short circuit appears in load elements, the IC of DC voltage converting circuit is difficult to carry out Current limited Control, and circuit is in big current operating state.The operating state of big current makes IC and the MOSFET pipe of DC voltage converting circuit generate heat, and along with the rising of temperature, circuit board can be examined Huang, even cause fire time serious.
Utility model content
The purpose of this utility model overcomes shortcomings and deficiencies of the prior art, provides a kind of DC power supply circuit with short-circuit protection, protect when short circuit appears in load to whole DC power supply circuit.
The purpose of this utility model is achieved through the following technical solutions:
There is the DC power supply circuit of short-circuit protection; comprise direct voltage modular converter and short circuit protection module; the input of described short circuit protection module is connected with the output of direct voltage modular converter; export the input of termination direct voltage modular converter; described short circuit protection module is no-output when DC voltage converting circuit exports normal; drag down the control end voltage of voltage transformation module when direct voltage protection module output short-circuit, direct voltage modular converter is quit work.
As preferably, the input of described short circuit protection module is connected with the output of direct voltage modular converter, exports the control end of termination direct voltage modular converter and/or compensates end.
As preferably, described short circuit protection module comprises: resistance R7, resistance R8, resistance R9, resistance R10, voltage stabilizing didoe ZD1, triode Q1 and triode Q2, described resistance R7 one end is connected with the output of direct voltage modular converter, the other end is one end of connecting resistance R8 and the base stage of triode Q1 respectively, the other end ground connection of resistance R8; The emitter of triode Q1, collector electrode is one end of connecting resistance R9 and one end of resistance R10 respectively, another termination DC power supply of resistance R9, the other end ground connection of resistance R10; The base stage of triode Q2 is connect after the collector electrode series voltage stabilizing diode ZD1 of triode Q1; The grounded emitter of triode, collector electrode connects the control end of direct voltage modular converter and/or compensates end.
As preferably; described short circuit protection module also comprises the electric capacity C10 be connected in parallel with resistance R10; when direct voltage modular converter works on power moment; its output no-output; electric capacity C10 makes resistance R10 both end voltage be zero; make triode Q2 in the cut-off of direct voltage modular converter powered on moment, and by resistance R9, electric capacity C10 is charged, make direct voltage modular converter have enough time to enter normal operating conditions.
As preferably, described short circuit protection module also comprises the resistance R11 of base stage and the emitter being connected across triode Q2, and resistance R11 prevents interference and produces misoperation, improves the accuracy of short-circuit protection.
As preferably, described direct voltage modular converter adopts direct voltage conversion chip, and the collector electrode of triode Q2 connects EN pin and/or the CMP pin of direct voltage conversion chip.
The utility model comprises following advantage and beneficial effect compared to existing technology:
(1) the utility model is by arranging short circuit protection module in DC power supply circuit; when DC power supply output short-circuit, DC power supply circuit is protected; prevent DC power supply circuit from burning out; and short circuit protection module is made up of simple electronic devices and components; circuit structure is simple; realize cost low, and it is little to take volume.
(2) by arranging an electric capacity C10 in parallel with resistance R10, make direct voltage modular converter powered on moment, resistance R10 both end voltage is zero, prevents powered on moment from producing misoperation, guarantees that DC power supply normally works.
(3) producing misoperation by preventing interference in the base stage of triode Q2 and emitter cross-over connection one resistance R11, improving the accuracy of short-circuit protection.
Accompanying drawing explanation
Fig. 1 is the block diagram that the utility model direct voltage modular converter is connected with short circuit protection module;
Fig. 2 is the circuit theory diagrams of embodiment 1;
Fig. 3 is the another kind of circuit theory diagrams of embodiment 1;
Fig. 4 is the circuit theory diagrams of embodiment 2.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.
Embodiment 1
As shown in Figure 1; there is the DC power supply circuit of short-circuit protection; comprise direct voltage modular converter and short circuit protection module; the input of described short circuit protection module is connected with the output of direct voltage modular converter; export the compensation end (CMP pin) of termination direct voltage modular converter; described short circuit protection module is no-output when DC voltage converting circuit exports normal; drag down compensation end (CMP pin) voltage of voltage transformation module when direct voltage protection module output short-circuit, direct voltage modular converter is quit work.As shown in Figure 2, described short circuit protection module comprises: resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, electric capacity C10, voltage stabilizing didoe ZD1, triode Q1 and triode Q2, described resistance R7 one end is connected with the output SW of direct voltage modular converter, the other end is one end of connecting resistance R8 and the base stage of triode Q1 respectively, the other end ground connection of resistance R8; The emitter of triode Q1, collector electrode is one end of connecting resistance R9 and one end of resistance R10 respectively, another termination DC power supply of resistance R9, the other end ground connection of resistance R10; Electric capacity C10 and resistance R10 is connected in parallel; One end of difference connecting resistance R11 and the base stage of triode Q2 after the collector electrode series voltage stabilizing diode ZD1 of triode Q1, the other end ground connection of resistance R11; The grounded emitter of triode Q2, collector electrode connects the compensation end (CMP pin) of the IC chip of direct voltage modular converter.The IC chip of described direct voltage modular converter is MP2307.By arranging short circuit protection module in DC power supply circuit, when DC power supply output short-circuit, DC power supply circuit being protected, preventing DC power supply circuit from burning out; and short circuit protection module is made up of simple electronic devices and components; circuit structure is simple, realize cost low, and it is little to take volume.Described direct voltage modular converter also can be as shown in Figure 3 with the connection of protection short block.
Embodiment 2
As shown in Figure 4, the present embodiment is except following characteristics, and other are identical with embodiment 1:
The collector electrode of triode Q2 connects the control end (EN pin) of the IC chip of direct voltage modular converter.
The above embodiment only have expressed execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not 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 all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (6)
1. there is the DC power supply circuit of short-circuit protection; it is characterized in that: comprise direct voltage modular converter and short circuit protection module; the input of described short circuit protection module is connected with the output of direct voltage modular converter; export the input of termination direct voltage modular converter; described short circuit protection module is no-output when DC voltage converting circuit exports normal; drag down the control end voltage of voltage transformation module when direct voltage protection module output short-circuit, direct voltage modular converter is quit work.
2. DC power supply circuit according to claim 1, is characterized in that: the input of described short circuit protection module is connected with the output of direct voltage modular converter, exports the control end of termination direct voltage modular converter and/or compensates end.
3. DC power supply circuit according to claim 2, it is characterized in that, described short circuit protection module comprises: resistance R7, resistance R8, resistance R9, resistance R10, voltage stabilizing didoe ZD1, triode Q1 and triode Q2, described resistance R7 one end is connected with the output of direct voltage modular converter, the other end is one end of connecting resistance R8 and the base stage of triode Q1 respectively, the other end ground connection of resistance R8; The emitter of triode Q1, collector electrode is one end of connecting resistance R9 and one end of resistance R10 respectively, another termination DC power supply of resistance R9, the other end ground connection of resistance R10; The base stage of triode Q2 is connect after the collector electrode series voltage stabilizing diode ZD1 of triode Q1; The grounded emitter of triode, collector electrode connects the control end of direct voltage modular converter and/or compensates end.
4. DC power supply circuit according to claim 3, is characterized in that: described short circuit protection module also comprises the electric capacity C10 be connected in parallel with resistance R10.
5. DC power supply circuit according to claim 4, is characterized in that: described short circuit protection module also comprises the resistance R11 of base stage and the emitter being connected across triode Q2.
6. the DC power supply circuit according to any one of claim 3 to 5, is characterized in that, described direct voltage modular converter adopts direct voltage conversion chip, and the collector electrode of triode Q2 connects EN pin and/or the CMP pin of direct voltage conversion chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520281010.7U CN204794007U (en) | 2015-05-04 | 2015-05-04 | DC power supply circuit with short -circuit protection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520281010.7U CN204794007U (en) | 2015-05-04 | 2015-05-04 | DC power supply circuit with short -circuit protection |
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| Publication Number | Publication Date |
|---|---|
| CN204794007U true CN204794007U (en) | 2015-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520281010.7U Active CN204794007U (en) | 2015-05-04 | 2015-05-04 | DC power supply circuit with short -circuit protection |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322499A (en) * | 2015-12-09 | 2016-02-10 | 江苏天安智联科技股份有限公司 | Short-circuit protection circuit based on power supply load abnormality |
| CN109768523A (en) * | 2019-03-15 | 2019-05-17 | 广州市星翼电子科技有限公司 | A kind of DC power supply output protection circuit of low cost |
| CN110994559A (en) * | 2019-12-06 | 2020-04-10 | 郑州嘉晨电器有限公司 | Power module output end short-circuit protection circuit |
| CN111525515A (en) * | 2020-04-13 | 2020-08-11 | 欣旺达电子股份有限公司 | Short circuit/overload protection circuit and method for DC/DC power supply module |
-
2015
- 2015-05-04 CN CN201520281010.7U patent/CN204794007U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105322499A (en) * | 2015-12-09 | 2016-02-10 | 江苏天安智联科技股份有限公司 | Short-circuit protection circuit based on power supply load abnormality |
| CN105322499B (en) * | 2015-12-09 | 2018-02-16 | 江苏天安智联科技股份有限公司 | A kind of short-circuit protection circuit abnormal based on power source loads |
| CN109768523A (en) * | 2019-03-15 | 2019-05-17 | 广州市星翼电子科技有限公司 | A kind of DC power supply output protection circuit of low cost |
| CN110994559A (en) * | 2019-12-06 | 2020-04-10 | 郑州嘉晨电器有限公司 | Power module output end short-circuit protection circuit |
| CN110994559B (en) * | 2019-12-06 | 2022-05-03 | 河南嘉晨智能控制股份有限公司 | Power module output end short-circuit protection circuit |
| CN111525515A (en) * | 2020-04-13 | 2020-08-11 | 欣旺达电子股份有限公司 | Short circuit/overload protection circuit and method for DC/DC power supply module |
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