CN203167382U - LED driving circuit and lamp - Google Patents
LED driving circuit and lamp Download PDFInfo
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- CN203167382U CN203167382U CN2013201715924U CN201320171592U CN203167382U CN 203167382 U CN203167382 U CN 203167382U CN 2013201715924 U CN2013201715924 U CN 2013201715924U CN 201320171592 U CN201320171592 U CN 201320171592U CN 203167382 U CN203167382 U CN 203167382U
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- 239000004065 semiconductor Substances 0.000 claims description 19
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Abstract
The utility model is applicable to the electronic field and provides an LED driving circuit which comprises a DC power supply, a control driving unit and an LED lamp string. A first input end of the control driving unit is connected with the DC power supply, and an output end of the control driving unit is connected with an input end of the LED lamp string. The LED driving circuit also comprises a short-circuit protection circuit, an input end of the short-circuit protection circuit is connected with an output end of the LED lamp string, and an output end of the short-circuit protection circuit is connected with a control end of the control driving unit. The LED driving circuit is employed in the utility model, through the employment of the short-circuit protection circuit, when an output load is in short circuit, the control end voltage of a first switch element is raised instantly, the first switch element is conducted, a second switch element is stopped, the control end of the control driving unit is grounded, thus the output of the control driving unit is stopped, the function of load short circuit protection is realized, and a problem of the damage of the control driving unit and the LED lamp string is avoided. The utility model further provides a lamp with the LED driving circuit.
Description
Technical field
The utility model belongs to electronic applications, relates in particular to a kind of led drive circuit and light fixture.
Background technology
Led light source is as new type light source, it has energy-saving and environmental protection, characteristics of high efficiency, and the LED technology is day by day ripe and extensively apply to every field, but LED is when the operation irregularity situation, tend to occur short-circuit state, so in led drive circuit, need to add short-circuit protection circuit, prevent that effectively fault from enlarging, and serious consequences such as baked wheaten cake machine occur; The most complex structure of the short-circuit protection circuit that prior art adopts, with high costs, so prior art needs to improve.
The utility model content
The purpose of this utility model is to provide a kind of led drive circuit, is intended to solve that short circuit appears in existing led drive circuit output loading and the problem that causes it to be damaged.In order to solve the problems of the technologies described above, the utility model adopts following scheme to be achieved:
A kind of led drive circuit; comprise DC power supply, control driver element and LED lamp string; the first input end of described control driver element is connected with DC power supply; output is connected with the input of LED lamp string, and described led drive circuit also comprises input and the short-circuit protection circuit that LED lamp string output is connected, output is connected with the control end of control driver element.
Further, described short-circuit protection circuit comprises first switch element, second switch element, first resistance, second resistance, the 3rd resistance, first electric capacity;
The control end of wherein said first switch element is connected with the output of LED lamp string by first resistance, second end of described first switch element is connected with the control end of described second switch element, the 3rd end ground connection of described first switch element, described first electric capacity are connected between the control end and the 3rd end of described first switch element; The control end of described second switch element also is connected with power end by second resistance, second end of described second switch element is connected with the output of LED lamp string, and the 3rd end of described second switch element is connected with the 3rd end of described first switch element and ground connection by the 3rd resistance.
Further, described first switch element is triode, the base stage of described triode is the control end of first switch element, second end of very described first switch element of the current collection of described triode, the 3rd end of very described first switch element of the emission of described triode.
Further, described second switch element is metal-oxide-semiconductor, and the grid of described metal-oxide-semiconductor is the control end of second switch element, and the drain electrode of described metal-oxide-semiconductor is second end of described second switch element, and the source electrode of described metal-oxide-semiconductor is the 3rd end of described second switch element.
Further, described triode is NPN type triode.
Further, described metal-oxide-semiconductor is the N-channel MOS pipe.
Another purpose of the present utility model also provides the light fixture with above-mentioned led drive circuit.
The led drive circuit that the utility model adopts, by adopting short-circuit protection circuit, when short circuit appears in output loading, the control end voltage instantaneous of first switch element is drawn high, the first switch element conducting, and the second switch element ends, the control end ground connection of control driver element, cause controlling driver element output and turn-off, thereby realize the function that load short circuits is protected, the problem of having avoided control driver element and LED lamp string to damage; This led drive circuit reliability height, simple in structure, cost is extremely low, has bigger using value and market prospects.
Description of drawings
Fig. 1 is the theory diagram of the led drive circuit that provides of the utility model embodiment;
Fig. 2 is the circuit diagram of the led drive circuit that provides of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
Fig. 1 shows the theory diagram of the led drive circuit that the utility model embodiment provides, and details are as follows:
This led drive circuit; comprise DC power supply 10, control driver element 20 and LED lamp string 30; the first input end of described control driver element 20 is connected with DC power supply 10; output is connected with the input of LED lamp string 30, and described led drive circuit also comprises input and the short-circuit protection circuit 40 that LED lamp string 30 outputs are connected, output is connected with the control end of control driver element 20.
Fig. 2 shows the circuit diagram of the led drive circuit that this practical embodiment provides, and details are as follows:
Short-circuit protection circuit 40 comprises first switch element 41, second switch element 42, first resistance R 1, second resistance R 2, the 3rd resistance 3, first capacitor C 1;
The control end of wherein said first switch element 41 is connected with the output of LED lamp string 30 by first resistance R 1, second end of described first switch element 41 is connected with the control end of described second switch element 42, the 3rd end ground connection of described first switch element 41, described first capacitor C 1 are connected between the control end and the 3rd end of described first switch element 41; The control end of described second switch element 42 also is connected with power end VCC by second resistance R 2, second end of described second switch element 42 is connected with the output of LED lamp string 30, and the 3rd end of described second switch element 42 is connected with the 3rd end of described first switch element 41 and ground connection by the 3rd resistance R 3.
As the utility model one embodiment, described first resistance R 1, second resistance R 2 are divider resistance, and described the 3rd resistance R 3 is sample resistance.
As the utility model one embodiment, described first switch element 41 is triode Q1, the base stage of described triode Q1 is the control end of first switch element 41, second end of very described first switch element 41 of the current collection of described triode Q1, the 3rd end of very described first switch element 41 of the emission of described triode Q1; Described second switch element 42 is metal-oxide-semiconductor Q2, the grid of described metal-oxide-semiconductor Q2 is the control end of second switch element 42, the drain electrode of described metal-oxide-semiconductor Q2 is second end of described second switch element 42, and the source electrode of described metal-oxide-semiconductor Q2 is the 3rd end of described second switch element 42; Wherein said triode Q1 is NPN type triode, and described metal-oxide-semiconductor Q2 is the N-channel MOS pipe.
Short-circuit protection circuit 40 operation principles of described led drive circuit are as follows:
When system's operate as normal, the voltage that A is ordered through first resistance R, 1 dividing potential drop after, the base voltage of triode Q1 is less than conducting voltage, so triode Q1 ends; Simultaneously power supply VCC through second resistance R, 2 dividing potential drops after, the grid of metal-oxide-semiconductor Q2 and source voltage difference are greater than conducting voltage, so metal-oxide-semiconductor Q2 conducting, operating current is through sample resistance R3, the voltage that B is ordered feeds back to control driver element 20, thereby the control operating current is stable.
When short circuit appears in output loading; the voltage that A is ordered was drawn high by moment; the base voltage of triode Q1 also draw high by moment; triode Q1 conducting, thus the grid voltage of metal-oxide-semiconductor Q2 is dragged down, and then metal-oxide-semiconductor Q2 ends; the B point voltage is close to zero; the control end of control driver element 20 is equivalent to ground connection, causes controlling driver element 20 outputs and turn-offs, thereby realize the function that load short circuits is protected.
The led drive circuit that the utility model adopts, by adopting short-circuit protection circuit, when short circuit appears in output loading, the control end voltage instantaneous of first switch element is drawn high, the first switch element conducting, and the second switch element ends, the control end ground connection of control driver element, cause controlling driver element output and turn-off, thereby realize the function that load short circuits is protected, the problem of having avoided control driver element and LED lamp string to damage; This led drive circuit reliability height, simple in structure, cost is extremely low, has bigger using value and market prospects.
The above only is preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of within spirit of the present utility model and principle, doing, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (7)
1. led drive circuit; comprise DC power supply, control driver element and LED lamp string; the first input end of described control driver element is connected with DC power supply; output is connected with the input of LED lamp string; it is characterized in that described led drive circuit also comprises input and the short-circuit protection circuit that LED lamp string output is connected, output is connected with the control end of control driver element.
2. led drive circuit according to claim 1 is characterized in that, described short-circuit protection circuit comprises first switch element, second switch element, first resistance, second resistance, the 3rd resistance, first electric capacity;
The control end of wherein said first switch element is connected with the output of LED lamp string by first resistance, second end of described first switch element is connected with the control end of described second switch element, the 3rd end ground connection of described first switch element, described first electric capacity are connected between the control end and the 3rd end of described first switch element; The control end of described second switch element also is connected with power end by second resistance, second end of described second switch element is connected with the output of LED lamp string, and the 3rd end of described second switch element is connected with the 3rd end of described first switch element and ground connection by the 3rd resistance.
3. led drive circuit according to claim 2, it is characterized in that, described first switch element is triode, the base stage of described triode is the control end of first switch element, second end of very described first switch element of the current collection of described triode, the 3rd end of very described first switch element of the emission of described triode.
4. led drive circuit according to claim 2, it is characterized in that, described second switch element is metal-oxide-semiconductor, the grid of described metal-oxide-semiconductor is the control end of second switch element, the drain electrode of described metal-oxide-semiconductor is second end of described second switch element, and the source electrode of described metal-oxide-semiconductor is the 3rd end of described second switch element.
5. led drive circuit according to claim 3 is characterized in that, described triode is NPN type triode.
6. led drive circuit according to claim 4 is characterized in that, described metal-oxide-semiconductor is the N-channel MOS pipe.
7. a light fixture is characterized in that, described light fixture comprises each described led drive circuit among the claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201715924U CN203167382U (en) | 2013-04-08 | 2013-04-08 | LED driving circuit and lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013201715924U CN203167382U (en) | 2013-04-08 | 2013-04-08 | LED driving circuit and lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203167382U true CN203167382U (en) | 2013-08-28 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013201715924U Expired - Lifetime CN203167382U (en) | 2013-04-08 | 2013-04-08 | LED driving circuit and lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203167382U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935026A (en) * | 2014-03-19 | 2015-09-23 | 罗伯特·博世有限公司 | Battery cell arrangement with battery cell and current limiting circuit and corresponding method |
| WO2018126495A1 (en) * | 2017-01-04 | 2018-07-12 | 深圳市华星光电技术有限公司 | Led backlight driving circuit and liquid crystal display |
-
2013
- 2013-04-08 CN CN2013201715924U patent/CN203167382U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104935026A (en) * | 2014-03-19 | 2015-09-23 | 罗伯特·博世有限公司 | Battery cell arrangement with battery cell and current limiting circuit and corresponding method |
| WO2018126495A1 (en) * | 2017-01-04 | 2018-07-12 | 深圳市华星光电技术有限公司 | Led backlight driving circuit and liquid crystal display |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
|
| CX01 | Expiry of patent term |