CN204349437U - A kind of LED overtemperature and overcurrent protective device - Google Patents
A kind of LED overtemperature and overcurrent protective device Download PDFInfo
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- CN204349437U CN204349437U CN201420866580.8U CN201420866580U CN204349437U CN 204349437 U CN204349437 U CN 204349437U CN 201420866580 U CN201420866580 U CN 201420866580U CN 204349437 U CN204349437 U CN 204349437U
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- led
- overtemperature
- led component
- semistor
- overcurrent protective
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Abstract
The utility model provides a kind of LED overtemperature and overcurrent protective device, the overtemperature and overcurrent protective circuit comprising LED component and be connected with described LED component, the power supply that described overtemperature and overcurrent protective circuit comprises semistor and is connected with described semistor; Wherein, described semistor is non-linear thermistor, and described power supply is for exchanging or DC power supply, and described LED component comprises one or more LED element.Owing to have employed semistor, can be carry out corresponding change at the electric current of LED component or variations in temperature, thus the acute variation of present electric current or temperature.Thus make the electric current of LED circuit there will not be sudden change, the temperature of LED can not raise again, decreases that LED light declines, the generation of the problem such as aging.
Description
Technical field
The utility model relates to LED field, particularly relates to a kind of LED overtemperature and overcurrent protective device.
Background technology
The thermostatic control of LED, comprises the thermostatic control of high-power LED and low power LED thermostatic control, is the lighting of the knotty problem of industry, particularly great power LED always, temperature is too high, light decay is serious, the lost of life.First the constant temperature realizing LED want current constant control, but when pursuing the high brightness of LED, LED current can be caused comparatively large, and at this moment constant current not constant temperature, also needs thermostatic control.Existing constant temperature and constant-current circuit are all very complicated up till now, and components and parts are many, and reliability is low.So complete above-mentioned functions with minimum element, and be the unremitting pursuit of industry to high-power LED lighting device and low power LED light device protection neatly.
Utility model content
The purpose of this utility model is to provide a kind of LED overtemperature and overcurrent protective device, not high for the constant temperature control circuit reliability solving existing LED, and circuit is complicated, and simple electronic device can not be adopted to carry out the problem of overtemperature and overcurrent protection to LED matrix.
The utility model protects a kind of overtemperature and overcurrent protective device, the overtemperature and overcurrent protective circuit comprising LED component and be connected with described LED component, the power supply that described overtemperature and overcurrent protective circuit comprises semistor and is connected with described semistor;
Wherein, described semistor is non-linear thermistor, and described power supply is for exchanging or DC power supply, and described LED component comprises one or more LED element.
Preferably, described overtemperature and overcurrent protective circuit also comprises protection load, and described protection load is arranged between described power supply and described semistor, connects described power supply and described semistor.
The utility model also protects a kind of LED overtemperature and overcurrent protective device, comprise the first LED component and the second LED component, described overtemperature and overcurrent protective device also comprises the first overtemperature and overcurrent protective circuit be connected with described first LED component, the second overtemperature and overcurrent protective circuit be connected with described second LED component and for connecting and switching the controllable silicon of described first overtemperature and overcurrent protective circuit and the second overtemperature and overcurrent protective circuit; Described first overtemperature and overcurrent protective circuit comprises the first semistor be connected with described first LED component, and the resistance of described first semistor changes according to the temperature of described first LED component or electric current; Described second overtemperature and overcurrent protective circuit comprises the second semistor be connected with described second LED component, and the resistance of described second semistor changes according to the temperature of described second LED component or electric current.
Preferably, described first overtemperature and overcurrent protective circuit also comprises the first power supply, connects described controllable silicon and described first semistor; First step-down and voltage stabilizing portion, connect described controllable silicon and described first LED component, for providing the first voltage for described first LED component.
Preferably, described second overtemperature and overcurrent protective circuit also comprises second source, connects described controllable silicon and described second semistor; Second step-down and voltage stabilizing portion, connect described controllable silicon and described second LED component, for providing the second voltage for described second LED component.
Preferably, described first protective circuit also comprises: the first controlled switch, is connected to described first step-down and between voltage stabilizing portion and described controllable silicon, and controls to carry out folding according to silicon controlled; First protection load, is connected between the first power supply and described first LED component.
Preferably, described second protective circuit also comprises: the second controlled switch, is connected to described second step-down and between voltage stabilizing portion and described controllable silicon, and controls to carry out folding according to silicon controlled; Second protection load, is connected between second source and described second LED component.
Preferably, described first power supply is AC power.
Preferably, described second source is DC power supply.
Have employed positive temperature coefficient thermistor in LED overtemperature and overcurrent protective device of the present utility model and carry out establishing protective circuit, positive temperature coefficient thermistor has the characteristic of nonlinear change resistance, simultaneously, when threshold temperature lower than semistor of the temperature of high-power LED lamp and circuit, its resistance value is substantially constant, LED lamp circuit normally works always, when the threshold temperature of LED lamp circuit temperature higher than semistor, its resistance value becomes large, limit the operating current of equipment, the temperature of LED lamp circuit is forced to reduce, the resistance of positive temperature coefficient thermistor is also cut down according to the circumstance thereupon, when LED lamp circuit temperature raises again, then the resistance of positive temperature coefficient thermistor becomes large again, and by above-mentioned regular cycles, make the temperature of LED lamp circuit one among a small circle in be in dynamic balance state.To reach, thermostatically controlled object is completed to LED lamp, owing to adding positive temperature coefficient device, the electric current of LED circuit there will not be sudden change, the temperature of LED can not raise again, such LED would not produce light decay, aging, life-span reduces problem
Accompanying drawing explanation
Fig. 1 is the principle schematic of a kind of LED overtemperature and overcurrent of the utility model protective device.
Fig. 2 is the principle schematic of the utility model another kind of LED overtemperature and overcurrent protective device.
Fig. 3 is the principle schematic of another LED overtemperature and overcurrent protective device of the utility model.
Embodiment
For making the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and the specific embodiments, the utility model is described in further details.Should be appreciated that specific embodiment described herein only for explaining the utility model, being not limited to the utility model.
embodiment 1
See Fig. 1; a kind of LED overtemperature and overcurrent protective device; the overtemperature and overcurrent protective circuit comprising LED component 7 and be connected with described LED component, the power supply that described overtemperature and overcurrent protective circuit comprises semistor 6 and is connected with described semistor.
Semistor 6 is wherein non-linear thermistor, nonlinear change is carried out with temperature and resistance, because it is semistor, when threshold temperature lower than semistor of the temperature of circuit, its resistance value is substantially constant, LED lamp circuit normally works always, when the threshold temperature of LED lamp circuit temperature higher than semistor, its resistance value becomes large, limit the operating current of equipment, the temperature of LED lamp circuit is forced to reduce, the resistance of positive temperature coefficient thermistor is also cut down according to the circumstance thereupon, when LED lamp circuit temperature raises again, then the resistance of positive temperature coefficient thermistor becomes large again, and by above-mentioned regular cycles, make the temperature of LED lamp circuit one among a small circle in be in dynamic balance state.Thus can be that LED component can not exceed certain set point of temperature and certain rated current and work on, ensure that the safety and stability of work.
Further; in the present embodiment, power supply is AC power, can arrange protection load (not shown) between AC power and semistor; LED component is multiple LED element, and LED element refers to that the minimum LED that singlely can carry out LED is individual.
embodiment 2
See Fig. 2; a kind of LED overtemperature and overcurrent protective device; the overtemperature and overcurrent protective circuit comprising LED component 12 and be connected with described LED component, the power supply that described overtemperature and overcurrent protective circuit comprises semistor 11 and is connected with described semistor.
Semistor is wherein non-linear thermistor, nonlinear change is carried out with temperature and resistance, because it is semistor, when threshold temperature lower than semistor of the temperature of circuit, its resistance value is substantially constant, LED lamp circuit normally works always, when the threshold temperature of LED lamp circuit temperature higher than semistor, its resistance value becomes large, limit the operating current of equipment, the temperature of LED lamp circuit is forced to reduce, the resistance of positive temperature coefficient thermistor is also cut down according to the circumstance thereupon, when LED lamp circuit temperature raises again, then the resistance of positive temperature coefficient thermistor becomes large again, and by above-mentioned regular cycles, make the temperature of LED lamp circuit one among a small circle in be in dynamic balance state.Thus can be that LED component can not exceed certain set point of temperature and certain rated current and work on, ensure that the safety and stability of work.
Further; in the present embodiment, power supply is DC power supply, can arrange protection load (not shown) between AC power and semistor; LED component is a LED element, and LED element refers to that the minimum LED that singlely can carry out LED is individual.
embodiment 3
See Fig. 3, a kind of LED overtemperature and overcurrent protective device, comprise the first LED component 7 and the second LED component 12, described circuit also comprises the first protective circuit be connected with described first LED component 7, the second protective circuit be connected with described second LED component 12 and for connecting and switching the controllable silicon 3 of described first protective circuit and the second protective circuit;
Described first protective circuit comprises:
First semistor 6, is connected with described first LED component 7, and the resistance of described first semistor 6 changes according to the temperature of described first LED component 7 or electric current, regulates the temperature of described first LED component 7 to reach balance;
Described second protective circuit comprises:
Second semistor 11, be connected with described second LED component 12, the resistance of described first semistor 11 changes according to the temperature of described first LED component 12 or electric current, regulates the temperature of described second LED component 12 to reach balance.
In the present embodiment of utility model, described first protective circuit also comprises the first power supply 1, is connected with described controllable silicon 3; First step-down and voltage stabilizing portion 5, be connected with described first LED component 7, for providing the first voltage for described first LED component 7.
In the present embodiment of the present utility model, described second protective circuit comprises second source 2, is connected with described controllable silicon 3; Second step-down and voltage stabilizing portion 5, be connected with described second LED component 12, and for providing the second voltage for described second LED component 12, described second voltage is higher than described first voltage.Because LED component is low voltage product, the first and second step-downs and voltage stabilizing portion is therefore needed to ensure the stable low-voltage of LED work.
It should be noted that, in the present embodiment of the present utility model, switch by using controllable silicon 3, flexibly switch protecting is carried out to powerful first LED component in the first protective circuit and low power second LED component in the second protective circuit, and by adding the first special semistor and the second semistor, can according to the temperature change self-resistance of LED component, the temperature of circuit and electric current is made to reach balance, and in the first protective circuit and the second protective circuit, add the first step-down and voltage stabilizing portion and the second step-down and voltage stabilizing portion respectively, ensure the steady illumination of the first LED component and the second LED component.
In the present embodiment of the present utility model; for the first protective circuit; the unstable state stage work of the first semistor 6 in the three condition of the overtemperature and overcurrent protection of the first LED component 7; namely complete the thermostatically controlled object of LED, this first semistor 6 is a kind of non-linear thermistor elements.In the utility model the present embodiment, concise and to the point title, is designated as PTC
ror Rt, when the temperature of the first LED component 7 and the first protective circuit is lower than PTC
ror during the threshold temperature of Rt, the resistance value of this first semistor 6 is substantially constant, and the first LED component 7 normally works, when the first LED component 7 temperature is higher than PTC always
ror during the threshold temperature of Rt, its resistance value becomes large, limits the operating current of equipment, forces the temperature of the first LED component 7 reduce, PTC
ror the resistance of Rt is also cut down according to the circumstance thereupon, when the first LED component 7 temperature raises again, then PTC
ror the resistance of Rt becomes large again, and by above-mentioned regular cycles, make the temperature of the first LED component 7 one among a small circle in be in dynamic balance state.To reach, thermostatically controlled object is completed to the first LED component 7, owing to adding positive temperature coefficient device, the electric current of the first LED component 7 there will not be sudden change, the first LED component 7 can not raise again, such LED would not produce light decay, aging, life-span minimizing problem, this device is two-terminal element, nonpolarity, be connected in series to circuit after only need selecting appropriate model.
In addition, in the present embodiment of the present utility model, this first step-down and voltage stabilizing portion 5, for raising the both end voltage of described first LED component 7, are able to normal illumination to make this first LED component 7; Second step-down and voltage stabilizing portion 10, for raising the both end voltage of described first LED component 12, are able to normal illumination to make this first LED component 12.It should be noted that, described first LED component 12 is a high-capacity LED assembly, and described second LED component 12 is a low-power LED component.In addition, described first power supply 1 is an AC power, and described second source 2 is a DC power supply.
With reference to Fig. 3, described first protective circuit also comprises: the first controlled switch 4, is connected with described controllable silicon 3, and carries out folding according to the control of controllable silicon 3; First protection load 8, is connected with described first LED component 12.In addition, described second protective circuit also comprises: the second controlled switch 9, is connected with described controllable silicon 3, and carries out folding according to the control of controllable silicon 3; Second protection load 13, is connected with described second LED component 12.
LED overtemperature and overcurrent protective circuit of the present utility model comprises the first protective circuit and the second protective circuit, switch by using controllable silicon, flexibly switch protecting is carried out to powerful first LED component in the first protective circuit and low power second LED component in the second protective circuit, and by adding above-mentioned semistor, can according to the temperature change self-resistance of LED component, the temperature of circuit and electric current is made to reach balance, and in the first protective circuit and the second protective circuit, add the first step-down and voltage stabilizing portion and the second step-down and voltage stabilizing portion respectively, ensure the steady illumination of the first LED component and the second LED component.
In addition, in the present embodiment, the first and second LED component all can comprise one or more LED element, and LED element refers to that the minimum LED that singlely can carry out LED is individual.When in Fig. 3, the first LED component or the second LED component are multiple LED element, connected mode should with reference to shown in Fig. 1, namely be illustrated in figure 3 coordination between the first LED component and the second LED component, and the first and second LED component inside are illustrated in figure 1 series relationship.
The foregoing is only the utility model preferred embodiment, not in order to limit the utility model, all do within principle of the present utility model any amendment, equivalent to replace and improvement etc., within the scope that all should be included in the utility model protection.
Claims (9)
1. a LED overtemperature and overcurrent protective device, the overtemperature and overcurrent protective circuit comprising LED component and be connected with described LED component, it is characterized in that, the power supply that described overtemperature and overcurrent protective circuit comprises semistor and is connected with described semistor;
Wherein, described semistor is non-linear thermistor, and described power supply is for exchanging or DC power supply, and described LED component comprises one or more LED element.
2. device according to claim 1; it is characterized in that; described overtemperature and overcurrent protective circuit also comprises protection load, and described protection load is arranged between described power supply and described semistor, connects described power supply and described semistor.
3. a LED overtemperature and overcurrent protective device, comprise the first LED component and the second LED component, it is characterized in that, described overtemperature and overcurrent protective device also comprises the first overtemperature and overcurrent protective circuit be connected with described first LED component, the second overtemperature and overcurrent protective circuit be connected with described second LED component and for connecting and switching the controllable silicon of described first overtemperature and overcurrent protective circuit and the second overtemperature and overcurrent protective circuit;
Described first overtemperature and overcurrent protective circuit comprises the first semistor be connected with described first LED component, and the resistance of described first semistor changes according to the temperature of described first LED component or electric current;
Described second overtemperature and overcurrent protective circuit comprises the second semistor be connected with described second LED component, and the resistance of described second semistor changes according to the temperature of described second LED component or electric current.
4. device according to claim 3, is characterized in that, described first overtemperature and overcurrent protective circuit also comprises:
First power supply, connects described controllable silicon and described first semistor;
First step-down and voltage stabilizing portion, connect described controllable silicon and described first LED component, for providing the first voltage for described first LED component.
5. device according to claim 3, is characterized in that, described second overtemperature and overcurrent protective circuit also comprises:
Second source, connects described controllable silicon and described second semistor;
Second step-down and voltage stabilizing portion, connect described controllable silicon and described second LED component, for providing the second voltage for described second LED component.
6. device according to claim 4, is characterized in that, described first overtemperature and overcurrent protective circuit also comprises:
First controlled switch, is connected to described first step-down and between voltage stabilizing portion and described controllable silicon, and controls to carry out folding according to silicon controlled;
First protection load, is connected between the first power supply and described first LED component.
7. device according to claim 5, is characterized in that, described second overtemperature and overcurrent protective circuit also comprises:
Second controlled switch, is connected to described second step-down and between voltage stabilizing portion and described controllable silicon, and controls to carry out folding according to silicon controlled;
Second protection load, is connected between second source and described second LED component.
8. device according to claim 4, is characterized in that, described first power supply is AC power.
9. device according to claim 5, is characterized in that, described second source is DC power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420866580.8U CN204349437U (en) | 2014-12-30 | 2014-12-30 | A kind of LED overtemperature and overcurrent protective device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420866580.8U CN204349437U (en) | 2014-12-30 | 2014-12-30 | A kind of LED overtemperature and overcurrent protective device |
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| Publication Number | Publication Date |
|---|---|
| CN204349437U true CN204349437U (en) | 2015-05-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420866580.8U Expired - Fee Related CN204349437U (en) | 2014-12-30 | 2014-12-30 | A kind of LED overtemperature and overcurrent protective device |
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| CN (1) | CN204349437U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194246A (en) * | 2018-11-22 | 2019-01-11 | 珠海格力电器股份有限公司 | A kind of over-temperature protection device, motor and its excess temperature protection method |
| CN112492721A (en) * | 2020-12-16 | 2021-03-12 | 上海裕芯电子科技有限公司 | LED constant current controller with over-temperature regulation function |
-
2014
- 2014-12-30 CN CN201420866580.8U patent/CN204349437U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109194246A (en) * | 2018-11-22 | 2019-01-11 | 珠海格力电器股份有限公司 | A kind of over-temperature protection device, motor and its excess temperature protection method |
| CN112492721A (en) * | 2020-12-16 | 2021-03-12 | 上海裕芯电子科技有限公司 | LED constant current controller with over-temperature regulation function |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150520 Termination date: 20151230 |
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| EXPY | Termination of patent right or utility model |