CN101442859A - Control circuit for LED car lamp - Google Patents
Control circuit for LED car lamp Download PDFInfo
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- CN101442859A CN101442859A CNA2008101287319A CN200810128731A CN101442859A CN 101442859 A CN101442859 A CN 101442859A CN A2008101287319 A CNA2008101287319 A CN A2008101287319A CN 200810128731 A CN200810128731 A CN 200810128731A CN 101442859 A CN101442859 A CN 101442859A
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Abstract
The invention relates to a LED car lamp control circuit comprising a LED car lamp assembly which includes several LEDs, at least one reflecting unit and at least one heat elimination unit; a driving circuit for controlling the LED to keep a stable brightness, chrominance and color temperature by controlling the input magnitude of the LED driving current; and a temperature sensing circuit for sensing the temperature of a certain measuring point of the LED car lamp assembly, and triggers the driving circuit to execute the action of output driving current magnitude correction by electronic signal as soon as the temperature reaches a preset value. Consequently, the invention can realize the even brightness, stable temperature of the LED, thereby avoids the damage to the LED caused by extra high temperature and avoids the changed brightness, chrominance and color temperature of the LED out of the criterion of relative car lamp controlling laws, consequently, can prolongs the service life of the LED.
Description
Technical field
What the present invention relates to is a kind of LED lamp lighting control circuit, refers to a kind of temperature or forward variation of voltage by sensing LED especially, adjusts the drive current of LED, and then makes the brightness output valve of LED be the design of stable state.
Background technology
Press, existing science and technology is its brightness can be reached with general bulb match in excellence or beauty for the technology of LED (light-emitting diode), and also the product of existing tool illumination functions is to use the luminous element of the LED of high brightness as described product, for example LED car light.When utilizing described LED as the luminous element of car light group, described car light group still must reach the requirement condition of relevant control car light rules, for example standard criterions such as the colourity of the brightness of car light and light or colour temperature.So-called colourity is the standard that is defined out by Commission Internationale De L'Eclairage (CIE), is the standard of differentiating red light or sodium yellow with chromaticity coordinate.The definition of so-called colour temperature be black matrix at the wavelength that different temperatures gave off, its unit represents with absolute temperature K, in order to declare the standard of white light, for example warm white 3600k or cold white 5000k or ultrawhite light 6000k or the like.
Yet aforesaid LED has along with the temperature change meeting causes disappearances such as the colourity of its brightness and light or colour temperature change.Yi Yan's, described LED has the characteristic that the temperature of voltage forward is a number (TemperatureCoefficient of Forward Voltage), promptly when the car light that is provided with LED after starting and using a period of time, described LED can produce certain heat and cause the temperature of described LED body to raise, this moment, the forward voltage of described LED promptly can descend, temperature rise simultaneously causes the LED internal quantum to reduce, the colourity or the colour temperature of the brightness deterioration of described LED and light thereof are changed, and then the brightness that makes described car light and the colourity or the colour temperature of the light requirement condition that do not meet relevant control car light rules.
In view of this, The present invention be directed to the disappearance that is produced when existing LED is applied in the car light group, is to invent out this case after long-term time study, and the phase can reach the requirement that meets numerous vehicle drivers' traffic safety.
Summary of the invention
Purpose of the present invention is to provide a LED lamp lighting control circuit, in order to overcome above-mentioned defective.
For realizing above-mentioned goal of the invention, the present invention proposes a kind of LED lamp lighting control circuit, it includes LED car light group, drive circuit and temperature sensing circuit, wherein said LED car light group is to include some LED, at least one reflector element and at least one heat-sink unit, described reflector element is in order to reflect the light that described LED produces, to make car light satisfy the requirement of relevant laws and regulations brightness and light type; Described heat-sink unit is to be connected with described LED, in order to thermal energy conduction that described LED the produced position beyond described LED body, or the lower position of other temperature, and reduce the LED body temperature; Described drive circuit be with described LED for being electrically connected, in order to the amount of drive current of the described LED of control input, and adjust colourity or the colour temperature that the described LED of control keeps stable brightness and light thereof; Described temperature sensing circuit be with described drive circuit for being electrically connected, and described temperature sensing circuit is to be provided with at least one temperature sensing component, and be connected with described LED car light group and set firmly, when reaching preset temperature, promptly trigger described drive circuit with electric signal and carry out the action that drive current output is revised by described temperature sensing circuit in order to the temperature of a certain measuring point of sensing described LED car light group.
Reintroduce another kind of LED lamp lighting control circuit according to above-mentioned conception inventor, it includes LED car light group, drive circuit and voltage sensing circuit, wherein said LED car light group is to include some LED, at least one reflector element and at least one heat-sink unit, described reflector element is in order to reflect the light that described LED produces, to make car light satisfy the requirement of relevant laws and regulations brightness and light type; Described heat-sink unit is to be connected with described LED, in order to thermal energy conduction that described LED the produced position beyond described LED body, or the lower position of other temperature, and reduce the LED body temperature; Described drive circuit be with the LED of described LED car light group for being electrically connected, in order to the amount of drive current of the described LED of control input, and adjust colourity or the colour temperature that the described LED of control keeps stable brightness and light thereof; Described voltage sensing circuit be simultaneously with the LED of described LED car light group and described drive circuit for being electrically connected, change when reaching predeterminated voltage in order to the terminal voltage of the described LED of sensing, promptly trigger described drive circuit with electric signal and carry out the action that drive current output is revised by described voltage sensing circuit.
Beneficial effect of the present invention compared with the prior art is, the temperature of the forward voltage that is had by described LED itself is the number characteristics, variation with itself temperature or terminal voltage, with temperature or voltage as feedbacking the factor of control, and cooperate suitable sensing circuit to trigger described drive circuit execution output correction, described drive circuit can be controlled for adjusting the amount of drive current of importing described LED11, colourity or colour temperature with the brightness that reaches described LED and light thereof are stable, and the temperature of described LED itself is tended towards stability, too high and damage to avoid taking place described LED self-temperature, even prolong the useful life of LED.
Description of drawings
Fig. 1 is the circuit framework schematic diagram of LED lamp lighting control circuit first embodiment of the present invention, and the solid arrow shown in it is represented the flow direction of electric signal (or electric current);
Fig. 2 is the connection diagram of the LED car light group of Fig. 1 and drive circuit, temperature sensing circuit, and the solid arrow shown in it is represented the flow direction of electric signal (or electric current);
Fig. 3 is the circuit framework schematic diagram of LED lamp lighting control circuit second embodiment of the present invention, and the solid arrow shown in it is represented the flow direction of electric signal (or electric current);
Fig. 4 is the connection diagram of the LED car light group of Fig. 3 and drive circuit, voltage sensing circuit, and the solid arrow shown in it is represented the flow direction of electric signal (or electric current).
Description of reference numerals: 1-LED car light group; 11-LED; The 111-radiating seat; The 112-circuit board; The 12-reflector element; The 121-groove; The 13-heat-sink unit; The 131-pedestal; 132-Zhu sheet; The 2-drive circuit; The 3-temperature sensing circuit; The 31-temperature sensing component; The 4-voltage sensing circuit.
Embodiment
Below in conjunction with accompanying drawing, to this novel above-mentionedly is described in more detail with other technical characterictic and advantage.
At first, see also Fig. 1, shown in Figure 2, be the first embodiment schematic diagram of LED lamp lighting control circuit of the present invention.Described in this example LED lamp lighting control circuit is to include a LED car light group 1, one drive circuit 2 and a temperature sensing circuit 3, wherein:
Described LED car light group 1 is the place ahead or the rear that is installed in existing automobile body, and described LED car light group 1 is to include some LED11, a reflector element 12 and a heat-sink unit 13.Described LED11 is in order to the luminous element as described LED car light group 1, described LED11 has a cooling base 111, and described LED11 is connected electrically in a circuit board 112, and described circuit board 112 is to be provided with some perforation, uses the cooling base 111 for described LED11 to wear.Described reflector element 12 is to form some grooves 121, and makes described LED11 be positioned at described groove 121 bottoms relatively, uses so that the light that described LED11 throwed reflects through described groove 121.Described heat-sink unit 13 is can metal material, ceramic material or other have high heat conduction be the number material made, described heat-sink unit 13 is to have a pedestal 131, use for described circuit board 112 and set firmly, make the cooling base 111 of described LED11 be attached to described pedestal 131, and stretch out to establish at described pedestal 131 and form some fins 132, described fin 132 is can be along with the difference of described LED car light group 1 space or vehicle body space, and do the design of different shaping, in order to the heat energy that described LED11 produced is conducted to described fin 132 by described cooling base 111, and utilize outside cold air and the heat energy that is stored in described fin 132 to carry out the heat exchange heat radiation.
Described drive circuit 2 be with the circuit board 112 of described LED car light group 1 for being electrically connected, in order to the amount of drive current of the described LED11 of control input, and then adjust colourity or the colour temperature that the described LED11 of control keeps stable brightness and light thereof.
Described temperature sensing circuit 3 be with described drive circuit 2 for being electrically connected, and described temperature sensing circuit 3 is to be provided with a temperature sensing component 31, described temperature sensing component 31 is the sensing components that can be thermojunction type, or the temperature sensing component of other form.Described temperature sensing component 31 is to be installed in aforementioned described fin 132, surface temperature in order to the described fin 132 of sensing, and produce an electric signal in real time and send described temperature sensing circuit 3 to, and when the surface temperature of the described fin 132 of 31 sensings of described temperature sensing component reaches preset temperature, promptly produce an electric signal and trigger the action that described drive circuit 2 is carried out drive current output correction by described temperature sensing circuit 3.Described temperature sensing component 31 also can be installed in the pad of described LED11 body and circuit board 112, the cooling base 111 of LED11, the pedestal 131 of heat-sink unit 13, or other is convenient to install the position that measures the LED temperature (graphic show), starts the variations in temperature of back in aforementioned sense position in order to the described LED11 of sensing.
Below be that operating principle at LED lamp lighting control circuit first embodiment of the present invention is illustrated.
The described LED11 of aforementioned described LED car light group 1 is with current control mode through described drive circuit 2, after driving its startup and using a period of time, described LED11 continues luminous and produces heat energy is arranged, and the cooling base 111 by described LED11 with thermal energy conduction to described heat-sink unit 13, the thermal energy conduction that described heat-sink unit 13 is about to be absorbed is to described fin 132, then be installed in the described temperature sensing component 31 of described fin 132, can sense the surface temperature of described fin 132, described temperature sensing component 31 promptly transmits an electric signal and gives temperature sensing circuit 3 simultaneously.When the surface temperature of described fin 132 was increased to described temperature sensing circuit 3 default high temperature, then described temperature sensing circuit 3 promptly produced an electric signal and sends described drive circuit 2 to.Described drive circuit 2 promptly limits the magnitude of current that inputs to described LED11, and the input power of described LED11 is weakened.After described drive circuit 2 inputs to the magnitude of current of described LED11 in restriction, the heat energy that described LED11 produced also can with minimizing, cause the surface temperature of described fin 132 to descend.When the surface temperature that senses described fin 132 when described temperature sensing component 31 dropped to described temperature sensing circuit 3 default low temperature, then described temperature sensing circuit 3 promptly produced an electric signal and sends described drive circuit 2 to.Described drive circuit 2 promptly increases the magnitude of current that inputs to described LED11, and the input power of described LED11 is increased.Through described fin 132 variations in temperature of continuous sensing, and control the input current amount of described LED11 in real time, described LED11 body temperature is tended towards stability, make the brightness of described LED11 and the colourity or the colour temperature of light thereof present stable state, and then described LED11 was activated in the time of operation, the requirement that its brightness and the colourity or the colour temperature of light all meet relevant control car light rules.
The following stated is the second embodiment of the present invention, and the essential structure group of described second embodiment and aforementioned first embodiment is established has same section, assembly that remarks is identical numbering, and short ofly mention especially, then being used as is to have equal structure and merit able one.
See also Fig. 3, shown in Figure 4, be the second embodiment schematic diagram of LED lamp lighting control circuit of the present invention.In this example, described LED lamp lighting control circuit is to include a LED car light group 1, one drive circuit 2 and a voltage sensing circuit 4, wherein:
Described LED car light group 1 is the place ahead or the rear that is installed in existing automobile body, and described LED car light group 1 is to include some LED11, a reflector element 12 and a heat-sink unit 13.Described LED11 is in order to the luminous element as described LED car light group 1, described LED11 has a cooling base 111, and described LED11 is connected electrically in a circuit board 112, and described circuit board 112 is to be provided with some perforation, uses the cooling base 111 for described LED11 to wear.Described reflector element 12 is to form some grooves 121, and makes described LED be positioned at described groove 121 bottoms relatively, uses so that the light that described LED11 throwed reflects through described groove 121.Described heat-sink unit 13 is can metal material, ceramic material or other have high heat conduction be the number material made, described heat-sink unit 13 is to have a pedestal 131, use for described LED11 and set firmly, make the cooling base 111 of described LED11 be attached to described pedestal 131, and stretch out to establish at described pedestal 131 and form some fins 132, described fin 132 is can be along with the difference of described LED car light group 1 space or vehicle body space, and do the design of different shaping, in order to the heat energy that described LED11 produced is conducted to described fin 132 by described cooling base 111, and utilize outside cold air and the heat energy that is stored in described fin 132 to carry out the heat exchange heat radiation.
Described drive circuit 2 be with the circuit board 112 of described LED car light group 1 for being electrically connected, in order to the amount of drive current of the described LED11 of control input, and then adjust colourity or the colour temperature that the described LED11 of control keeps stable brightness and light thereof.
Described voltage sensing circuit 4 be simultaneously with described drive circuit 2 and described LED11 for being electrically connected, change when reaching described voltage sensing circuit 4 default change in voltage in order to the terminal voltage of the described LED11 of sensing, promptly produce an electric signal and trigger described drive circuit 2 and carry out the action that drive currents output is revised by described voltage sensing circuit 4.
Below be that operating principle at LED lamp lighting control circuit second embodiment of the present invention is illustrated.
The described LED11 of aforementioned described LED car light group 1 is with current control mode through described drive circuit 2, after driving its startup and using a period of time, described LED11 continues luminous and produces heat energy is arranged, and the cooling base 111 by described LED11 with thermal energy conduction to described heat-sink unit 13, the thermal energy conduction that described heat-sink unit 13 is about to be absorbed makes the heat energy that is stored in described fin 132 can utilize outside cold air to carry out the heat exchange heat radiation to described fin 132.When the temperature of described LED11 itself raises, its terminal voltage promptly can descend, temperature rise simultaneously causes the LED11 internal quantum to reduce, cause the brightness deterioration of described LED11 and the colourity or the colour temperature of light thereof to change, the terminal voltage that then described voltage sensing circuit 4 promptly senses described LED11 drops to default electronegative potential, and described voltage sensing circuit 4 promptly produces an electric signal and sends described drive circuit 2 to.Described drive circuit 2 promptly reduces the amount of drive current of the described LED11 of input, make described LED11 because input power reduces, then described LED11 body temperature reduces, and causes described LED11 body interior quantum efficiency and recovers, and keeps the colourity or the colour temperature of its normal brightness and light simultaneously.When the temperature of described LED11 itself descends, its terminal voltage promptly can increase, cause the brightness of described LED11 to increase, the terminal voltage that then described voltage sensing circuit 4 promptly senses described LED11 increases to default high potential, and described voltage sensing circuit 4 promptly produces an electric signal and sends described drive circuit 2 to.Described drive circuit 2 promptly limits the amount of drive current of the described LED11 of input, makes described LED11 keep normal brightness.Change through the described LED11 terminal voltage of continuous sensing, and control the input current amount of described LED11, and described LED11 body temperature is tended towards stability, finally cause the brightness of described LED11 and the colourity or the colour temperature of light thereof and present stable state, and then described LED11 was activated in the time of operation, the requirement that its brightness and the colourity or the colour temperature of light all meet relevant control car light rules.
In sum, we can know that the present invention has advantage what follows:
1. LED lamp lighting control circuit of the present invention is the temperature of the forward voltage that has by described LED itself Degree is several characteristics, as feedbacking the factor of control, and cooperates suitable sensing with the variation of its temperature or voltage The described drive circuit of circuit triggers tends towards stability the temperature of LED body, to reach described LED's Colourity or the colour temperature of brightness and light thereof present stable state.
2. LED lamp lighting control circuit of the present invention is to be applied in the LED car light group with heat-sink unit, and passes through The temperature of sensing LED or the variation of terminal voltage are auxiliary as the factor of back coupling control, make described LED originally The temperature of body tends towards stability, and is too high and damage to avoid taking place described LED self-temperature, or avoids because of institute The variation of the brightness of the LED that states and the colourity of light or colour temperature, and the relevant laws and regulations that do not meet the control car light are arranged The situation of standard.
Take a broad view of above-mentionedly, the present invention both be not seen in like product with combination and the feature of its integral body, Also have no open before the application, really met the legal important document of Patent Law, propose application for a patent for invention in accordance with the law.
More than explanation is novel just illustrative for this, and nonrestrictive, ordinary skill people The member understands, and in the situation that does not break away from the spirit and scope that following claims limit, can make and being permitted Revise changes more, or equivalence, but all will fall within the scope of protection of the present invention.
Claims (2)
1. LED lamp lighting control circuit, it is characterized in that: it includes:
LED car light group, it includes some LED, at least one reflector element and at least one heat-sink unit, described reflector element is in order to reflect the light that described LED produces, described heat-sink unit is connected with described LED, with the position of thermal energy conduction beyond described LED body that described LED produced;
Drive circuit, its be with described LED for being electrically connected, in order to the amount of drive current of the described LED of control input, and adjust colourity or the colour temperature that the described LED of control keeps stable brightness and light thereof;
Temperature sensing circuit, its be with described drive circuit for being electrically connected, and described temperature sensing circuit is provided with at least one temperature sensing component, and be connected with described LED car light group and set firmly, when reaching preset temperature, trigger described drive circuit by described temperature sensing circuit with electric signal and carry out the action that drive current output is revised in order to the temperature of a certain measuring point of sensing described LED car light group.
2. LED lamp lighting control circuit, it is characterized in that: it includes:
LED car light group, it includes some LED, at least one reflector element and at least one heat-sink unit, described reflector element reflects the light that described LED produces, described heat-sink unit is connected with described LED, with the position of thermal energy conduction beyond described LED body that described LED produced;
Drive circuit, its with the LED of described LED car light group for being electrically connected, in order to the amount of drive current of the described LED of control input, and adjust colourity or the colour temperature that the described LED of control keeps stable brightness and light thereof;
Voltage sensing circuit, its be simultaneously with the LED of described LED car light group and described drive circuit for being electrically connected, change when reaching predeterminated voltage in order to the terminal voltage of the described LED of sensing, trigger described drive circuit by described voltage sensing circuit with electric signal and carry out the action that drive current output is revised.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101287319A CN101442859A (en) | 2007-11-20 | 2008-06-20 | Control circuit for LED car lamp |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200720305101 | 2007-11-20 | ||
| CN200720305101.5 | 2007-11-20 | ||
| CNA2008101287319A CN101442859A (en) | 2007-11-20 | 2008-06-20 | Control circuit for LED car lamp |
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| CN101442859A true CN101442859A (en) | 2009-05-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101287319A Pending CN101442859A (en) | 2007-11-20 | 2008-06-20 | Control circuit for LED car lamp |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932166A (en) * | 2009-06-25 | 2010-12-29 | 扬光绿能股份有限公司 | Illumination device and control method thereof |
| CN102563492A (en) * | 2010-12-27 | 2012-07-11 | 株式会社电装 | Lighting apparatus and lighting fitting |
| CN102729894A (en) * | 2011-04-02 | 2012-10-17 | 廖运昌 | LED (Light-Emitting Diode) car light monitoring system |
| CN102769961A (en) * | 2011-05-05 | 2012-11-07 | 旭丽电子(广州)有限公司 | Alternating-current lighting device |
| CN101697654B (en) * | 2009-10-30 | 2013-02-27 | 中山大学 | Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors |
| CN103574544A (en) * | 2013-11-25 | 2014-02-12 | 奇瑞汽车股份有限公司 | LED automobile lamp driving system and control method thereof |
| CN104075216A (en) * | 2014-06-30 | 2014-10-01 | 上海信耀电子有限公司 | Car lamp light source |
| CN104390184A (en) * | 2014-09-30 | 2015-03-04 | 广东斯科电气股份有限公司 | Automobile LED (Light Emitting Diode) headlamp |
| CN105992431A (en) * | 2015-02-05 | 2016-10-05 | 佛山市禾才科技服务有限公司 | Control circuit and control method of controlling illumination of LED lamp |
| CN108419340A (en) * | 2018-05-09 | 2018-08-17 | 华域视觉科技(上海)有限公司 | The signal light electric installation of one lamp of signal lamp multi-purpose implementation method and multi signal function |
| CN110553211A (en) * | 2019-10-10 | 2019-12-10 | 深圳朗斯顿科技有限公司 | Vehicle lighting lamp capable of adjusting color temperature |
| CN112385316A (en) * | 2018-07-19 | 2021-02-19 | 株式会社小糸制作所 | Lighting circuit and vehicle lamp |
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2008
- 2008-06-20 CN CNA2008101287319A patent/CN101442859A/en active Pending
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101932166A (en) * | 2009-06-25 | 2010-12-29 | 扬光绿能股份有限公司 | Illumination device and control method thereof |
| CN101697654B (en) * | 2009-10-30 | 2013-02-27 | 中山大学 | Correlated color temperature and color rendering index self-calibration circuit of LED light source consisting of light of multiple colors |
| CN102563492B (en) * | 2010-12-27 | 2014-11-05 | 株式会社电装 | Lighting apparatus and lighting fitting |
| US9103521B2 (en) | 2010-12-27 | 2015-08-11 | Denso Corporation | Lighting apparatus and lighting fitting |
| CN102563492A (en) * | 2010-12-27 | 2012-07-11 | 株式会社电装 | Lighting apparatus and lighting fitting |
| CN102729894A (en) * | 2011-04-02 | 2012-10-17 | 廖运昌 | LED (Light-Emitting Diode) car light monitoring system |
| CN102729894B (en) * | 2011-04-02 | 2014-08-27 | 廖运昌 | LED (Light-Emitting Diode) car light monitoring system |
| CN102769961A (en) * | 2011-05-05 | 2012-11-07 | 旭丽电子(广州)有限公司 | Alternating-current lighting device |
| CN102769961B (en) * | 2011-05-05 | 2015-03-18 | 光宝电子(广州)有限公司 | Alternating-current lighting device |
| CN103574544A (en) * | 2013-11-25 | 2014-02-12 | 奇瑞汽车股份有限公司 | LED automobile lamp driving system and control method thereof |
| CN104075216A (en) * | 2014-06-30 | 2014-10-01 | 上海信耀电子有限公司 | Car lamp light source |
| CN104390184A (en) * | 2014-09-30 | 2015-03-04 | 广东斯科电气股份有限公司 | Automobile LED (Light Emitting Diode) headlamp |
| CN105992431A (en) * | 2015-02-05 | 2016-10-05 | 佛山市禾才科技服务有限公司 | Control circuit and control method of controlling illumination of LED lamp |
| CN108419340A (en) * | 2018-05-09 | 2018-08-17 | 华域视觉科技(上海)有限公司 | The signal light electric installation of one lamp of signal lamp multi-purpose implementation method and multi signal function |
| CN112385316A (en) * | 2018-07-19 | 2021-02-19 | 株式会社小糸制作所 | Lighting circuit and vehicle lamp |
| CN112385316B (en) * | 2018-07-19 | 2023-06-02 | 株式会社小糸制作所 | Lighting circuit and vehicle lamp |
| CN110553211A (en) * | 2019-10-10 | 2019-12-10 | 深圳朗斯顿科技有限公司 | Vehicle lighting lamp capable of adjusting color temperature |
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Open date: 20090527 |