CN102780199A - Overcurrent protection circuit and lamp - Google Patents
Overcurrent protection circuit and lamp Download PDFInfo
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- CN102780199A CN102780199A CN2011101242432A CN201110124243A CN102780199A CN 102780199 A CN102780199 A CN 102780199A CN 2011101242432 A CN2011101242432 A CN 2011101242432A CN 201110124243 A CN201110124243 A CN 201110124243A CN 102780199 A CN102780199 A CN 102780199A
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Abstract
The invention is applicable for the field of protection circuits, and particularly relates to an overcurrent protection circuit and a lamp. According to the embodiment of the invention, the overcurrent protection circuit is formed by discrete components; when the load current is greater than a designed overcurrent protection current value, a load power supply loop can be switched off rapidly to fulfill the aim of load overcurrent protection; and moreover, the overcurrent protection circuit is simple in structure and low in cost.
Description
Technical field
The invention belongs to the protective circuit field, relate in particular to a kind of current foldback circuit and light fixture.
Background technology
Electric energy and our life are closely bound up; The normal operation of various electronic products such as electronic equipment, electronic instrument all be unable to do without electric energy; But every kind of electronic product all has specified operating current, if operating current is excessive, so just is in improper operating state; Need circuit protection, otherwise electronic products such as meeting damage equipment, instrument.
Present current foldback circuit generally adopts single-chip microcomputer sample rate current and output control; Although adopt Single-chip Controlling to have the efficient height, use advantages such as flexible; Therefore but single-chip microcomputer need cooperate multiple devices such as a reference source, sample circuit to work, and has big, the complex structure of taking up room, many shortcomings such as with high costs.
Summary of the invention
The object of the present invention is to provide a kind of current foldback circuit, be intended to solve present current foldback circuit and have complex structure, problem with high costs.
The present invention is achieved in that a kind of current foldback circuit, is connected power supply and with between the electric loading, said current foldback circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, sampling resistor R6, P type metal-oxide-semiconductor Q2, first switching tube and second switch pipe;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of current foldback circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination electricity consumption load of current foldback circuit, and first termination power of said divider resistance R1 is anodal, and second end of said divider resistance R1 is through divider resistance R2 ground connection; Said first control end of switching tube connects the public connecting end of divider resistance R1 and divider resistance R2; The cold end ground connection of said first switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q2 of said first switching tube, said divider resistance R3 is connected between the hot end of the positive source and first switching tube; First termination of said sampling resistor R6 is used electric loading; The second end ground connection of said sampling resistor R6, the negative electrode of said voltage-stabiliser tube D1 connects first end of sampling resistor R6, and the anode of said voltage-stabiliser tube D1 connects first end of divider resistance R5; Second end of said divider resistance R5 is through divider resistance R4 ground connection; The control termination divider resistance R4 of said second switch pipe and the public connecting end of divider resistance R5, the cold end ground connection of said second switch pipe, high potential termination first control end of switching tube of said second switch pipe.
Another object of the present invention is to provide a kind of light fixture, comprise the current foldback circuit that is connected between power supply and the lamp circuit, said current foldback circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, sampling resistor R6, P type metal-oxide-semiconductor Q2, first switching tube and second switch pipe;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of current foldback circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination electricity consumption load of current foldback circuit, and first termination power of said divider resistance R1 is anodal, and second end of said divider resistance R1 is through divider resistance R2 ground connection; Said first control end of switching tube connects the public connecting end of divider resistance R1 and divider resistance R2; The cold end ground connection of said first switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q2 of said first switching tube, said divider resistance R3 is connected between the hot end of the positive source and first switching tube; First termination of said sampling resistor R6 is used electric loading; The second end ground connection of said sampling resistor R6, the negative electrode of said voltage-stabiliser tube D1 connects first end of sampling resistor R6, and the anode of said voltage-stabiliser tube D1 connects first end of divider resistance R5; Second end of said divider resistance R5 is through divider resistance R4 ground connection; The control termination divider resistance R4 of said second switch pipe and the public connecting end of divider resistance R5, the cold end ground connection of said second switch pipe, high potential termination first control end of switching tube of said second switch pipe.
In the present invention; This current foldback circuit adopts discrete component to constitute, and when load current during greater than the overcurrent protection current value of design, can cut off the electric loop rapidly; Reach the purpose of load overcurrent protection, and be somebody's turn to do the simple in structure, with low cost of current foldback circuit.
Description of drawings
Fig. 1 is the circuit structure diagram of the current foldback circuit that provides of first embodiment of the invention;
Fig. 2 is the circuit structure diagram of the current foldback circuit that provides of second embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 1 shows the circuit structure of the current foldback circuit that first embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
Current foldback circuit is connected power supply and with between the electric loading, current foldback circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, sampling resistor R6, P type metal-oxide-semiconductor Q2, first switching tube 101 and second switch pipe 102;
The source electrode of P type metal-oxide-semiconductor Q2 is the said positive source of input termination of current foldback circuit; The drain electrode of P type metal-oxide-semiconductor Q2 is the output termination electricity consumption load of current foldback circuit, and first termination power of divider resistance R1 is anodal, and second end of divider resistance R1 is through divider resistance R2 ground connection; The control termination divider resistance R1 of first switching tube 101 and the public connecting end of divider resistance R2; The cold end ground connection of first switching tube 101, the grid of the high potential termination P type metal-oxide-semiconductor Q2 of first switching tube 101, divider resistance R3 is connected between the hot end of the positive source and first switching tube 101; First termination of sampling resistor R6 is used electric loading; The second end ground connection of sampling resistor R6, the negative electrode of voltage-stabiliser tube D1 connects first end of sampling resistor R6, and the anode of voltage-stabiliser tube D1 connects first end of divider resistance R5; Second end of divider resistance R5 is through divider resistance R4 ground connection; The control termination divider resistance R4 of second switch pipe 102 and the public connecting end of divider resistance R5, the cold end ground connection of second switch pipe 102, the control end of high potential termination first switching tube 101 of second switch pipe 102.
As one embodiment of the invention; First switching tube 101 adopts triode Q1; The base stage of triode Q1 is the control end of first switching tube 101, and the current collection of triode Q1 is the hot end of first switching tube 101 very, and the emission of triode Q1 is the cold end of first switching tube 101 very.
As one embodiment of the invention; Second switch pipe 102 adopts triode Q3; The base stage of triode Q3 is the control end of second switch pipe 102, and the current collection of triode Q3 is the hot end of second switch pipe 102 very, and the emission of triode Q3 is the cold end of second switch pipe 102 very.
Fig. 2 shows the circuit structure of the current foldback circuit that second embodiment of the invention provides, and for the ease of explanation, only shows the part relevant with the embodiment of the invention, and details are as follows.
As one embodiment of the invention; First switching tube 101 adopts N type metal-oxide-semiconductor Q4; The grid of N type metal-oxide-semiconductor Q4 is the control end of first switching tube 101, and the drain electrode of N type metal-oxide-semiconductor Q4 is the hot end of first switching tube 101, and the source electrode of N type metal-oxide-semiconductor Q4 is the cold end of first switching tube 101.
As one embodiment of the invention; Second switch pipe 102 adopts N type metal-oxide-semiconductor Q5; The grid of N type metal-oxide-semiconductor Q5 is the control end of second switch pipe 102, and the drain electrode of N type metal-oxide-semiconductor Q5 is the hot end of second switch pipe 102, and the source electrode of N type metal-oxide-semiconductor Q5 is the cold end of second switch pipe 102.
Adopt triode Q1 with first switching tube 101 below, it is example that second switch pipe 102 adopts triode Q3, and the operation principle of current foldback circuit is described:
When energized and electricity consumption loaded work piece electric current just often, power supply is through divider resistance R1 and divider resistance R2 dividing potential drop, triode Q1 base voltage is high level and entering opening state; The grid of P type metal-oxide-semiconductor Q2 is connected to ground through triode Q1 collector and emitter so, and P type metal-oxide-semiconductor Q2 grid voltage is a low level, and P type metal-oxide-semiconductor Q2 gets into conducting state; The source electrode of P type metal-oxide-semiconductor Q2 is straight-through with drain electrode so; Power supply is given the electricity consumption electric, and electricity consumption this moment loaded work piece electric current is normal, and voltage-stabiliser tube D1 ends; Triode Q3 base stage is a low level, is in off state.
When electricity consumption loaded work piece electric current during greater than the overcurrent protection current value of design, voltage on the sampling resistor R6 raises, and voltage-stabiliser tube D1 is breakdown and get into conducting state; Triode Q3 base stage level is become height and is got into conducting state by low; Triode Q1 base stage level becomes low by height and gets into off state so, and P type metal-oxide-semiconductor Q2 grid level becomes height by low so, and P type metal-oxide-semiconductor Q2 gets into off state; The source electrode of P type metal-oxide-semiconductor Q2 breaks off with drain electrode so, and power supply is no longer given the electricity consumption electric.
If it is normal that electricity consumption loaded work piece electric current recovers, this moment, voltage-stabiliser tube D1 transferred not on-state to by conducting, and triode Q3 base stage level is become low by height; Triode Q3 gets into off state, and triode Q1 base stage level becomes height by low, and triode Q1 gets into conducting state; P type metal-oxide-semiconductor Q2 grid level is then become low by height so; P type metal-oxide-semiconductor Q2 gets into conducting state, the source electrode of P type metal-oxide-semiconductor Q2 and drain electrode conducting so, and power up is given the electricity consumption electric.
The embodiment of the invention also provides a kind of light fixture, comprises the current foldback circuit that is connected between power supply and the lamp circuit, and the current foldback circuit structure repeats no more as stated here.
With respect to prior art; The current foldback circuit that the embodiment of the invention provides adopts discrete component to constitute; When load current greater than the design the overcurrent protection current value time; Can cut off the electric loop rapidly, reach the purpose of load overcurrent protection, and this current foldback circuit is simple in structure, with low cost.
The above is merely preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. current foldback circuit is connected power supply and, it is characterized in that said current foldback circuit comprises with between the electric loading:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, sampling resistor R6, P type metal-oxide-semiconductor Q2, first switching tube and second switch pipe;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of current foldback circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination electricity consumption load of current foldback circuit, and first termination power of said divider resistance R1 is anodal, and second end of said divider resistance R1 is through divider resistance R2 ground connection; Said first control end of switching tube connects the public connecting end of divider resistance R1 and divider resistance R2; The cold end ground connection of said first switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q2 of said first switching tube, said divider resistance R3 is connected between the hot end of the positive source and first switching tube; First termination of said sampling resistor R6 is used electric loading; The second end ground connection of said sampling resistor R6, the negative electrode of said voltage-stabiliser tube D1 connects first end of sampling resistor R6, and the anode of said voltage-stabiliser tube D1 connects first end of divider resistance R5; Second end of said divider resistance R5 is through divider resistance R4 ground connection; The control termination divider resistance R4 of said second switch pipe and the public connecting end of divider resistance R5, the cold end ground connection of said second switch pipe, high potential termination first control end of switching tube of said second switch pipe.
2. current foldback circuit as claimed in claim 1; It is characterized in that; Said first switching tube adopts triode Q1; The base stage of said triode Q1 is first control end of switching tube, and the current collection of said triode Q1 is the hot end of first switching tube very, and the emission of said triode Q1 is the cold end of first switching tube very.
3. current foldback circuit as claimed in claim 1; It is characterized in that; Said first switching tube adopts N type metal-oxide-semiconductor Q4; The grid of said N type metal-oxide-semiconductor Q4 is first control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q4 is the hot end of first switching tube, and the source electrode of said N type metal-oxide-semiconductor Q4 is the cold end of first switching tube.
4. current foldback circuit as claimed in claim 1; It is characterized in that; Said second switch pipe adopts triode Q3; The base stage of said triode Q3 is the control end of second switch pipe, and the current collection of said triode Q3 is the hot end of second switch pipe very, and the emission of said triode Q3 is the cold end of second switch pipe very.
5. current foldback circuit as claimed in claim 1; It is characterized in that; Said second switch pipe adopts N type metal-oxide-semiconductor Q5; The grid of said N type metal-oxide-semiconductor Q5 is the control end of second switch pipe, and the drain electrode of said N type metal-oxide-semiconductor Q5 is the hot end of second switch pipe, and the source electrode of said N type metal-oxide-semiconductor Q5 is the cold end of second switch pipe.
6. a light fixture comprises the current foldback circuit that is connected between power supply and the lamp circuit, it is characterized in that, said current foldback circuit comprises:
Voltage-stabiliser tube D1, divider resistance R1, divider resistance R2, divider resistance R3, divider resistance R4, divider resistance R5, sampling resistor R6, P type metal-oxide-semiconductor Q2, first switching tube and second switch pipe;
The source electrode of said P type metal-oxide-semiconductor Q2 is the said positive source of input termination of current foldback circuit; The drain electrode of said P type metal-oxide-semiconductor Q2 is the output termination electricity consumption load of current foldback circuit, and first termination power of said divider resistance R1 is anodal, and second end of said divider resistance R1 is through divider resistance R2 ground connection; Said first control end of switching tube connects the public connecting end of divider resistance R1 and divider resistance R2; The cold end ground connection of said first switching tube, the grid of the high potential termination P type metal-oxide-semiconductor Q2 of said first switching tube, said divider resistance R3 is connected between the hot end of the positive source and first switching tube; First termination of said sampling resistor R6 is used electric loading; The second end ground connection of said sampling resistor R6, the negative electrode of said voltage-stabiliser tube D1 connects first end of sampling resistor R6, and the anode of said voltage-stabiliser tube D1 connects first end of divider resistance R5; Second end of said divider resistance R5 is through divider resistance R4 ground connection; The control termination divider resistance R4 of said second switch pipe and the public connecting end of divider resistance R5, the cold end ground connection of said second switch pipe, high potential termination first control end of switching tube of said second switch pipe.
7. light fixture as claimed in claim 6; It is characterized in that; Said first switching tube adopts triode Q1; The base stage of said triode Q1 is first control end of switching tube, and the current collection of said triode Q1 is the hot end of first switching tube very, and the emission of said triode Q1 is the cold end of first switching tube very.
8. light fixture as claimed in claim 6; It is characterized in that; Said first switching tube adopts N type metal-oxide-semiconductor Q4; The grid of said N type metal-oxide-semiconductor Q4 is first control end of switching tube, and the drain electrode of said N type metal-oxide-semiconductor Q4 is the hot end of first switching tube, and the source electrode of said N type metal-oxide-semiconductor Q4 is the cold end of first switching tube.
9. light fixture as claimed in claim 6; It is characterized in that; Said second switch pipe adopts triode Q3; The base stage of said triode Q3 is the control end of second switch pipe, and the current collection of said triode Q3 is the hot end of second switch pipe very, and the emission of said triode Q3 is the cold end of second switch pipe very.
10. light fixture as claimed in claim 6; It is characterized in that; Said second switch pipe adopts N type metal-oxide-semiconductor Q5; The grid of said N type metal-oxide-semiconductor Q5 is the control end of second switch pipe, and the drain electrode of said N type metal-oxide-semiconductor Q5 is the hot end of second switch pipe, and the source electrode of said N type metal-oxide-semiconductor Q5 is the cold end of second switch pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101242432A CN102780199A (en) | 2011-05-13 | 2011-05-13 | Overcurrent protection circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011101242432A CN102780199A (en) | 2011-05-13 | 2011-05-13 | Overcurrent protection circuit and lamp |
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| CN102780199A true CN102780199A (en) | 2012-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011101242432A Pending CN102780199A (en) | 2011-05-13 | 2011-05-13 | Overcurrent protection circuit and lamp |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260314A (en) * | 2013-05-24 | 2013-08-21 | 深圳市华星光电技术有限公司 | Short circuit protection circuit and electronic device with same |
| CN103595016A (en) * | 2013-11-22 | 2014-02-19 | 郑州光力科技股份有限公司 | Current-limiting protection circuit |
| CN104218926A (en) * | 2014-09-01 | 2014-12-17 | 陆俊 | Force-sensitive time-delay switch control circuit |
| CN104716838A (en) * | 2015-04-10 | 2015-06-17 | 成都千嘉科技有限公司 | Dc-dc power converter circuit |
| CN105322500A (en) * | 2015-11-24 | 2016-02-10 | 深圳市捷先数码科技股份有限公司 | M-Bus protector with self-recovery function |
| CN109067385A (en) * | 2018-08-14 | 2018-12-21 | 辅易航智能科技(苏州)有限公司 | A kind of onboard sensor power unit switching circuit |
| CN109103842A (en) * | 2018-09-03 | 2018-12-28 | 重庆惠科金渝光电科技有限公司 | Overcurrent protection driving circuit and display device |
| CN109301794A (en) * | 2018-11-08 | 2019-02-01 | 深圳市创鹏翔科技有限公司 | A kind of ultrahigh speed short-circuit protection circuit that can restore automatically |
| CN111693903A (en) * | 2020-05-22 | 2020-09-22 | 杭州高特电子设备股份有限公司 | Battery collection wire harness error-proofing detection circuit and wire harness detector |
| US11070047B2 (en) | 2018-09-03 | 2021-07-20 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Overcurrent protection driving circuit and display apparatus |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260314A (en) * | 2013-05-24 | 2013-08-21 | 深圳市华星光电技术有限公司 | Short circuit protection circuit and electronic device with same |
| CN103595016A (en) * | 2013-11-22 | 2014-02-19 | 郑州光力科技股份有限公司 | Current-limiting protection circuit |
| CN104218926A (en) * | 2014-09-01 | 2014-12-17 | 陆俊 | Force-sensitive time-delay switch control circuit |
| CN104716838A (en) * | 2015-04-10 | 2015-06-17 | 成都千嘉科技有限公司 | Dc-dc power converter circuit |
| CN105322500A (en) * | 2015-11-24 | 2016-02-10 | 深圳市捷先数码科技股份有限公司 | M-Bus protector with self-recovery function |
| CN109067385A (en) * | 2018-08-14 | 2018-12-21 | 辅易航智能科技(苏州)有限公司 | A kind of onboard sensor power unit switching circuit |
| CN109103842A (en) * | 2018-09-03 | 2018-12-28 | 重庆惠科金渝光电科技有限公司 | Overcurrent protection driving circuit and display device |
| US11070047B2 (en) | 2018-09-03 | 2021-07-20 | Chongqing Hkc Optoelectronics Technology Co., Ltd. | Overcurrent protection driving circuit and display apparatus |
| CN109301794A (en) * | 2018-11-08 | 2019-02-01 | 深圳市创鹏翔科技有限公司 | A kind of ultrahigh speed short-circuit protection circuit that can restore automatically |
| CN111693903A (en) * | 2020-05-22 | 2020-09-22 | 杭州高特电子设备股份有限公司 | Battery collection wire harness error-proofing detection circuit and wire harness detector |
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Application publication date: 20121114 |