CN101155453A - Light source driving device - Google Patents
Light source driving device Download PDFInfo
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- CN101155453A CN101155453A CNA2006101543886A CN200610154388A CN101155453A CN 101155453 A CN101155453 A CN 101155453A CN A2006101543886 A CNA2006101543886 A CN A2006101543886A CN 200610154388 A CN200610154388 A CN 200610154388A CN 101155453 A CN101155453 A CN 101155453A
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Abstract
A light source driving device comprises a signal process unit, a control unit and a driving unit. The signal process unit generates actuating signal and light modulating signal according the input signal. The control unit has an actuating module and a light modulating module, wherein the actuating module starts the driving device according to the actuating signal, and the light modulating module generates light modulating drive signal according the light modulating signal. The driving unit regulates the lightness of the light source according to the light modulating driving signal.
Description
Technical field
The invention relates to a kind of drive unit of light source, and particularly need only receive a kind of input signal and just can be activated, and determine the drive unit of light modulation degree according to this relevant for a kind of.
Background technology
Increase along with display function, so integrated circuit (IntegratedCircuit that in display, is adopted, IC) circuit complexity also constantly increases, and causes integrated circuit need receive many different control signals, and is needed all multi-functional to reach the consumer.And the control circuit that is used for adjusting the luminous intensity of display (Display) light source is an example wherein, as shown in Figure 1.
Fig. 1 is the input signal schematic diagram of known control circuit.This control circuit 101 is the luminous intensities that are used for adjusting light source 102, wherein the integrated circuit used with light modulation of control circuit 101 is realized, and light source 102 can be by cold-cathode fluorescence lamp (Cathode Cold Fluorescent Lamp, CCFL) form, or (Light Emitting Diode LED) forms by light-emitting diode.Whether control circuit 101 starts according to enable signal ES that it received decision, and when starting output pulse width signal PWM, luminous with driving light source 102 beginnings.And when control circuit 101 started, control circuit 101 determined the pulse duration of pulse width signal PWM according to dim signal DS that it received, so that light source 102 determines luminous intensity according to the pulse duration of pulse width signal PWM.
When pulse width signal PWM presents time of high potential when longer, the ON time of light source 102 is longer, so the brightness of light source 102 is also brighter.Otherwise, when time that pulse width signal PWM presents high potential more in short-term, the ON time of light source 102 is shorter, so the brightness of light source 102 is also darker.
Yet, since control circuit 101 need to receive these two kinds of enable signal ES and dim signal DS independently control signal operate, so manufacturer must additionally provide enable signal ES and dim signal DS to control circuit 101 uses.In other words, manufacturer must utilize extra circuit to go to produce independently control signal of these two kinds of enable signal ES and dim signal DS, and control the state of above-mentioned two kinds of signals, and not only improved the cost of product thus, also increased the degree of difficulty of circuit design.
Summary of the invention
Purpose of the present invention just provides and a kind ofly need only receive a kind of input signal and just can be activated, and determines the drive unit of light modulation degree according to this.
A further object of the present invention provides a kind of drive unit that can reduce product cost.
Another purpose of the present invention provides a kind of drive unit that can reduce the circuit design degree of difficulty.
A more purpose of the present invention provides a kind of drive unit with temperature-compensating.
Based on above-mentioned and other purpose, the invention provides a kind of drive unit of light source, it comprises signal processing unit, control unit and driver element.Signal processing unit produces enable signal and dim signal according to input signal.Control unit has activation module and light-adjusting module, and wherein activation module starts drive unit according to enable signal, and light-adjusting module produces the light modulation drive signal according to dim signal.Driver element is then adjusted the luminosity of light source according to the light modulation drive signal.
In addition, in order to achieve the above object, the invention provides a kind of drive unit of light source, in order to receive dim signal.This drive unit comprises temperature compensating element, control unit and driver element.Wherein, temperature compensating element receives dim signal.Control unit has the light-adjusting module of negative light modulation, and this light-adjusting module is coupled to temperature compensating element, and produces the light modulation drive signal according to dim signal.Driver element is adjusted the luminosity of light source according to the light modulation drive signal, and wherein when ambient temperature rose, temperature compensating element was adjusted dim signal, descended in order to do the electric current that makes the light source of flowing through.
According to the described drive unit of one embodiment of the invention, above-mentioned signal processing unit produces enable signal and dim signal according to the voltage level of input signal.
According to the described drive unit of one embodiment of the invention, above-mentioned signal processing unit comprises first signal processing circuit and secondary signal treatment circuit.First signal processing circuit couples the activation module, produces enable signal in order to the voltage level of foundation input signal, and when the stop supplies input signal, keeps the enable signal Preset Time.The secondary signal treatment circuit couples light-adjusting module, produces dim signal in order to the voltage level of foundation input signal.
According to the described drive unit of one embodiment of the invention, the first above-mentioned signal processing circuit comprises first diode, first impedance, second impedance and the 3rd impedance.The anode receiving inputted signal of first diode.First impedance coupling is between the negative electrode and activation module of first diode.Second impedance coupling is between first impedance and common potential.And the 3rd impedance coupling is between first impedance and common potential.In this embodiment, above-mentioned first impedance and second impedance realize with resistance that all the 3rd impedance then realizes with electric capacity.
According to the described drive unit of one embodiment of the invention, above-mentioned secondary signal treatment circuit comprises the 4th impedance, the 5th impedance and second diode.A wherein termination of the 4th impedance is received input signal.The 5th impedance coupling is between the other end and common potential of the 4th impedance.And the anode of second diode couples the other end of the 4th impedance, and negative electrode then couples light-adjusting module.In this embodiment, above-mentioned the 4th impedance and the 5th impedance all realize with resistance.
According to the described drive unit of one embodiment of the invention, above-mentioned input signal comprises direct current signal.
According to the described drive unit of one embodiment of the invention, above-mentioned input signal comprises pulse width signal (PWM), and light-adjusting module more determines the light modulation drive signal according to the duty ratio of pulse width signal, to adjust the luminosity of light source.
According to the described drive unit of one embodiment of the invention, above-mentioned temperature compensating element is a diode, and is the second above-mentioned diode.
According to the described drive unit of one embodiment of the invention, above-mentioned temperature compensating element is a thermistor, and is the 5th above-mentioned impedance.
In sum, the present invention removes receiving inputted signal because of adopting signal processing circuit, and make this signal processing circuit produce enable signal and dim signal according to the voltage level of this input signal, therefore drive unit of the present invention need only receive a kind of input signal and just can start, and can determine the degree of light modulation according to this.Thus, manufacturer just need not utilize extra circuit to go to produce independently control signal of these two kinds of enable signal ES and dim signal DS, need not utilize foregoing circuit to remove to control the state of above-mentioned two kinds of signals yet, so can reduce the cost of product, also reduced the degree of difficulty of circuit design, and the present invention also can reach the effect of temperature-compensating by temperature compensating element.
For above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly, and cooperate appended graphicly, be described in detail below.
Description of drawings
Fig. 1 is the input signal schematic diagram of known control circuit.
Fig. 2 is the drive unit according to one embodiment of the invention.
[main element label declaration]
101: control circuit
102,210: light source
220: signal processing unit
230: control unit
231: the activation module
232: light-adjusting module
240: driver element
250: the first signal processing circuits
260: the secondary signal treatment circuit
251,261: diode
252,253,262,263: resistance
254: electric capacity
DDS: light modulation drive signal
DS: dim signal
ES: enable signal
GND: common potential
INS: input signal
PWM: pulse width signal
Embodiment
Fig. 2 is the drive unit according to preferred embodiment of the present invention, in order to adjust the luminous intensity of light source 210.This light source 210 can be a cold-cathode fluorescence lamp, or light-emitting diode, can also be the cold cathode fluorescent lamp module that the mode with backlight module presents, or light-emitting diode (LED) module, or even the light-emitting device of other kind.
The drive unit of present embodiment comprises signal processing unit 220, control unit 230 and driver element 240.Wherein, signal processing unit 220 produces enable signal ES and dim signal DS according to the voltage level of input signal INS.The functional similarity of control unit 230 and control circuit 101 shown in Figure 1, it has activation module 231 and light-adjusting module 232, wherein activation module 231 starts drive unit according to enable signal ES, and light-adjusting module 232 produces light modulation drive signal DDS (in this embodiment, this light modulation drive signal DDS is a pulse width signal) according to dim signal DS.240 luminosity of adjusting light source 210 according to light modulation drive signal DDS of driver element.
Above-mentioned signal processing circuit 220 comprises first signal processing circuit 250 and secondary signal treatment circuit 260.Wherein, first signal processing circuit 250 couples activation module 231, produces enable signal ES in order to the voltage level of foundation input signal INS, and when stop supplies input signal INS, keeps enable signal ES Preset Time.Secondary signal treatment circuit 260 couples light-adjusting module 232, produces dim signal DS in order to the voltage level of foundation input signal INS.
First signal processing circuit 250 comprises diode 251, first impedance, second impedance and the 3rd impedance.In this embodiment, first impedance, second impedance realize with resistance 252 and 253 that respectively the 3rd impedance realizes with electric capacity 254.Wherein, the anode receiving inputted signal INS of diode 251.First impedance coupling is between the negative electrode and activation module 231 of diode 251.A wherein end of second impedance couples the activation module 231 and first impedance, and the other end couples common potential GND.The 3rd impedance then is parallel to second impedance.
Secondary signal treatment circuit 260 comprises diode 261, the 4th impedance and the 5th impedance.In this embodiment, the 4th impedance and the 5th impedance realize with resistance 262 and 263 respectively.A wherein termination of the 4th impedance is received input signal INS.The 5th impedance coupling is between the other end and common potential GND of the 4th impedance.And the anode of diode 261 couples the other end of the 4th impedance, and negative electrode then couples light-adjusting module 232.
The drive unit that present embodiment has been described respectively form member, and after the annexation between each member, will be that direct current signal is an example below with input signal INS, the manner of execution of this drive unit is described.
For asking the convenience of explanation, we suppose that earlier light-adjusting module 232 carries out light modulation for the mode that adopts negative light modulation, and activation module 231 is according to voltage swing decision whether startup drive unit of enable signal ES, carry out luminously with driving light source 210, and light-adjusting module 232 is according to the light modulation degree of the voltage swing of dim signal DS decision light modulation drive signal DDS.In addition, the beginning operating voltage that opens of also supposing light-adjusting module 232 opens the beginning operating voltage greater than activation module 231.If the voltage of enable signal ES opens the beginning operating voltage greater than activation module 231, drive unit will start so.Similarly, if the voltage of dim signal DS greater than light-adjusting module 232 open the beginning operating voltage, light-adjusting module 232 just can carry out light modulation so.
When input signal INS supply voltage, and resistance 253 resulting dividing potential drops (that is enable signal ES) open the beginning operating voltage less than activation module 231, and resistance 263 resulting dividing potential drops (that is dim signal DS) also less than light-adjusting module 232 open the beginning during operating voltage, drive unit will be in closing state and can't carry out the light modulation operation.
When input signal INS supply voltage, and increase the voltage level of input signal INS, open the beginning operating voltage up to resistance 253 resulting dividing potential drops greater than activation module 231, but when resistance 263 resulting dividing potential drops begin operating voltage less than opening of light-adjusting module 232, drive unit is activated, and driver element 240 beginning driving light sources 210 carry out luminous.Yet since resistance 263 resulting dividing potential drops less than light-adjusting module 232 open the beginning operating voltage, make light-adjusting module 232 not be enabled as yet, so the time can't produce light modulation drive signal DDS.In other words, though this moment, drive unit can driving light source 210 carries out luminously, can't carry out dimming function.
When input signal INS supply voltage, and increase the voltage level of input signal INS, open the beginning operating voltage up to resistance 253 resulting dividing potential drops greater than activation module 231, and when resistance 263 resulting dividing potential drops also begin operating voltage greater than opening of light-adjusting module 232, drive unit is activated, and driving light source 210 carries out luminous.At this moment, because resistance 263 resulting dividing potential drops open the beginning operating voltage greater than light-adjusting module 232, make light-adjusting module 232 be enabled, so the time light-adjusting module 232 can adjust the pulse duration of light modulation drive signal DDS according to the voltage swing of its received dim signal DS.In other words, this moment, drive unit not only can driving light source 210 carries out luminously, can also carry out dimming function.
Because light-adjusting module 232 adopts the mode of negative light modulation to carry out light modulation, it is big more therefore to work as resistance 263 resulting dividing potential drops, and the voltage of dim signal DS is just big more, and it is just short more that then light modulation drive signal DDS presents the time of high potential, and light source 210 is just dark more.Otherwise when resistance 263 resulting dividing potential drops are more little, the voltage of dim signal DS is just more little, and it is just long more that then light modulation drive signal DDS presents time of high potential, and light source 210 is just bright more.
When input signal INS stop supplies voltage, then whole drive unit is closed, so light source 210 also is closed naturally.Though the aforesaid operations mode is to be described with the dimming mode of bearing light modulation, right those skilled in the art should know by inference, also can operate if light-adjusting module 232 adopts the mode of positive light modulation to carry out light modulation.So-called positive light modulation, be exactly when the voltage of dim signal DS big more, it is just long more that then light modulation drive signal DDS presents time of high potential, light source 210 is just bright more.Otherwise when the voltage of dim signal DS is more little, it is just short more that then light modulation drive signal DDS presents the time of high potential, and light source 210 is just dark more.
Therefore, no matter light-adjusting module 232 adopts the mode of positive light modulation to carry out light modulation, or adopt the mode of negative light modulation to carry out light modulation, as long as by adjusting the voltage swing of input signal INS, just can determine whether to start drive unit, and whether accessory drive carries out light modulation, the degree of all right accessory drive light modulation.
Above-mentioned drive unit not only can be applied under the situation that input signal INS is a direct current signal, if the user is in response to the actual needs in the design, and input signal is changed the employing pulse width signal, and this drive unit can correctly be operated too.To be that pulse width signal is an example below, the manner of execution of this drive unit will be described with input signal INS.
What must illustrate in advance is, because input signal INS is a pulse width signal, so light-adjusting module 232 must determine the degree of light modulation according to the duty ratio of pulse width signal.In addition, for the convenience that illustrates, we suppose that earlier light-adjusting module 232 carries out light modulation for the mode that adopts negative light modulation, and the beginning operating voltage that opens of light-adjusting module 232 opens the beginning operating voltage greater than activation module 231, also hypothesis is when input signal INS is high logic level, and resistance 253 and 263 resulting dividing potential drops (voltage of enable signal ES and dim signal DS just) are understood respectively and to be opened the beginning operating voltage greater than activation module 231 and light-adjusting module 232.
When input signal INS is a pulse width signal and when presenting high logic level (just input signal INS supply voltage), because resistance 253 and 263 resulting dividing potential drops open the beginning operating voltage greater than activation module 231 and light-adjusting module 232 respectively, therefore drive unit is activated, and can carry out light modulation.At this moment, as long as, just can determine the degree of light modulation by adjusting the duty ratio of input signal INS.With the operation of reality, if the time that input signal INS is presented high logic level transfers longly more, it is just short more that then light modulation drive signal DDS presents the time of high logic level, so light source 210 is just dark more.Otherwise if the time that input signal INS is presented high logic level transfers shortly more, it is just long more that then light modulation drive signal DDS presents time of high logic level, so light source 210 is just bright more.
When input signal is that pulse width signal and INS present low logic level, electric capacity 254 will be with electric power stored when input signal INS supplies voltage, offer starting state one Preset Time of activation module 231 to keep drive unit, time span approximately is a resistance 253 and the two the product of value of electric capacity 254.And, the diode 251 of this moment is in order to block the electric current that is flowed back to input signal INS by electric capacity 254, in order to avoid electric capacity 254 has been put stored electric power by this path, in addition, 261 of diodes are in order to block the electric current that is flowed back to input signal INS by light-adjusting module 232, and flow to the electric current of common potential GND by light-adjusting module 232, and make it to present and open circuit, cause light-adjusting module 232 inoperation.
From the above, as long as suitably adjust the discharge time of electric capacity 254 and the size of capacitance, just can be so that when input signal INS present low logic level, activation module 231 receives the stored electric power of electric capacity 254, and then keeps the starting state of drive unit.Yet because light-adjusting module 232 does not have similar energy-storage travelling wave tube and can supply electric power at this moment, therefore light-adjusting module 232 during this time can't carry out light modulation.In addition, if will make the complete shut-down operation of drive unit, as long as make input signal INS continue to present low logic level (just making input signal INS continue stop supplies voltage), then electric capacity 254 can all discharge stored electric power by resistance 253, drive unit make enable signal ES make operating voltage, so will stop naturally fully less than opening.
Though the aforesaid operations mode is to be described with the dimming mode of bearing light modulation, right those skilled in the art should know by inference, also can operate if light-adjusting module 232 adopts the mode of positive light modulation to carry out light modulation.So-called positive light modulation, to present time of high logic level long more as input signal INS exactly, and it is just long more that then light modulation drive signal DDS presents time of high logic level, so light source 210 is just bright more.Otherwise short more if input signal INS presents the time of high logic level, it is just short more that then light modulation drive signal DDS presents the time of high logic level, so light source 210 is just dark more.
In addition, adopt the mode of negative light modulation to carry out under the condition of light modulation at above-mentioned light-adjusting module 232, when light-adjusting module 232 can carry out light modulation, along with arround ambient temperature rise, make the temperature of diode 261 also and then rise, cause the cut-in voltage (Cut-In Voltage) of diode 261 to diminish thereupon, and then reduce the cross-pressure on the diode 261, therefore make light-adjusting module 232 received voltages become big, cause the electric current that flows through light source 210 to diminish.Usually light source 210 (for example, light-emitting diode (LED) module) wishes that its operating current can diminish, to increase the service life when high temperature.Therefore, in the present embodiment, diode 261 is temperature compensating element, by the characteristic of diode 261, when ambient temperature raises, the operating current of light source 210 is diminished, and just can reach temperature-compensating and the effect that increases the service life.
In addition, in present embodiment, resistance 263 can be the thermistor of positive temperature coefficient, therefore when ambient temperature raises, the resistance of resistance 263 rises, and then increases the cross-pressure on the resistance 263, therefore makes light-adjusting module 232 received voltages become big, cause the electric current that flows through light source 210 to diminish, to reach the effect of temperature-compensating.In addition, in other embodiments, when light-adjusting module 232 carries out light modulation for the mode that adopts positive light modulation, resistance 263 is the thermistor of negative temperature coefficient, and therefore when ambient temperature raise, the resistance of resistance 263 descended, and then reduce cross-pressure on the resistance 263, therefore make the voltage decreases that light-adjusting module 232 is received to cause the electric current that flows through light source 210 to diminish, also can reach the effect of temperature-compensating.
In sum, can pass through at least one temperature compensating element (for example, diode 261 or thermistor 263) and couple mutually, utilize the temperature characterisitic of temperature compensating element, reach the purpose of temperature-compensating with the light-adjusting module 232 of control unit 220.
What deserves to be mentioned is, if light source 210 is cold-cathode fluorescence lamps, or during cold cathode fluorescent lamp module, mostly comprise a direct current so in the driver element 240 and deliver stream transformer (DC to AC Inverter), become required AC power kenel of cold-cathode fluorescence lamp or cold cathode fluorescent lamp module and required voltage level with the conversion of signals that driver element 240 is received.And if light source 210 is light-emitting diode or light-emitting diode (LED) module, then comprise a DC-DC transducer (DC toDC Converter) in the driver element 240 mostly, become light-emitting diode or the required voltage level of light-emitting diode (LED) module with the conversion of signals that driver element 240 is received.
In addition, in the drive unit design of high-order, the user more can feed back to the mode of operation of light source 210 control unit 230, so that control unit 230 can dynamically change the light modulation degree according to the mode of operation of light source 210.Specifically, can utilize resistance to connect and flow through the size of current of light source 210 with detection, then this testing result be inputed to control unit 230, so that control unit 230 can stably be regulated the size of current of light source 210 with light source 210.Certainly, prerequisite is that control unit 230 must possess this kind function and just can.In addition, the user can use pulse width modulation control chip commonly used to realize above-mentioned control unit.
In the description of the foregoing description, though the execution mode of signal processing circuit 220 has been depicted a possible kenel, but those skilled in the art will be appreciated that, each manufacturer is all different for the design of signal processing circuit 220, and therefore application of the present invention is when being not restricted to the possible kenel of this kind.In other words, so long as designed signal processing circuit 220 can produce enable signal and dim signal according to the voltage level of the input signal that it received, and can be when input signal INS stop supplies voltage, keeping driving condition one Preset Time of drive unit, has been to have met spiritual place of the present invention just.
In sum, the present invention removes receiving inputted signal because of adopting signal processing circuit, and make this signal processing circuit produce enable signal and dim signal according to the voltage level of this input signal, therefore drive unit of the present invention need only receive a kind of input signal and just can start, and can determine the degree of light modulation according to this.Thus, manufacturer just need not utilize extra circuit to go to produce independently control signal of these two kinds of enable signal ES and dim signal DS, need not utilize foregoing circuit to remove to control the state of above-mentioned two kinds of signals yet, so can reduce the cost of product, also reduced the degree of difficulty of circuit design, and the present invention also can reach the effect of temperature-compensating by temperature compensating element.
Though the present invention discloses as above with preferred embodiment; right its is not in order to limit the present invention; any those skilled in the art; without departing from the spirit and scope of the present invention; when can doing a little change and retouching, so protection scope of the present invention is as the criterion when looking appended the claim scope person of defining.
Claims (20)
1. the drive unit of a light source in order to receiving inputted signal, comprising:
Signal processing unit according to this input signal, and produces enable signal and dim signal;
Control unit has activation module and light-adjusting module, and this activation module starts this drive unit according to this enable signal, and this light-adjusting module produces the light modulation drive signal according to this dim signal; And
Driver element according to this light modulation drive signal, is adjusted the luminosity of this light source.
2. the drive unit of light source according to claim 1, wherein this signal processing unit produces this enable signal and this dim signal according to the voltage level of this input signal.
3. the drive unit of light source according to claim 2, wherein this signal processing unit comprises:
First signal processing circuit couples this activation module, in order to producing this enable signal according to the voltage level of this input signal, and when this input signal of stop supplies, keeps this enable signal Preset Time; And
The secondary signal treatment circuit couples this light-adjusting module, in order to produce this dim signal according to the voltage level of this input signal.
4. the drive unit of light source according to claim 3, wherein this first signal processing circuit comprises:
First diode, its anode receives this input signal;
First impedance is coupled between the negative electrode and this activation module of this first diode;
Second impedance is coupled between this first impedance and the common potential; And
The 3rd impedance is coupled between this first impedance and this common potential.
5. the drive unit of light source according to claim 4, wherein this first impedance and this second impedance are respectively resistance, and the 3rd impedance is an electric capacity.
6. the drive unit of light source according to claim 3, wherein this secondary signal treatment circuit comprises:
The 4th impedance, a wherein termination of the 4th impedance is received this input signal;
The 5th impedance is coupled between the other end and this common potential of the 4th impedance; And
Second diode, its anode couples the other end of the 4th impedance, and its negative electrode couples this light-adjusting module.
7. the drive unit of light source according to claim 6, wherein the 4th impedance and the 5th impedance respectively are resistance.
8. the drive unit of light source according to claim 6, wherein the 5th impedance is a thermistor.
9. the drive unit of light source according to claim 8, wherein this light-adjusting module adopts the mode of negative light modulation to carry out light modulation, and this thermistor is the thermistor of positive temperature coefficient.
10. the drive unit of light source according to claim 8, wherein this light-adjusting module adopts the mode of positive light modulation to carry out light modulation, and this thermistor is the thermistor of negative temperature coefficient.
11. the drive unit of light source according to claim 1, wherein this light source comprises cold-cathode fluorescence lamp.
12. the drive unit of light source according to claim 1, wherein this light source comprises light-emitting diode.
13. the drive unit of light source according to claim 1, wherein this input signal comprises direct current signal.
14. the drive unit of light source according to claim 1, wherein this input signal comprises pulse width signal, and this light-adjusting module also determines this light modulation drive signal according to the duty ratio of this pulse width signal, to adjust the luminosity of this light source.
15. the drive unit of light source according to claim 1, wherein this control unit comprises the pulse width modulation control chip.
16. the drive unit of light source according to claim 1, wherein this signal processing unit has temperature compensating element, and it is to couple this light-adjusting module, when ambient temperature rises, adjusts this dim signal, and the electric current of this light source of flowing through is descended.
17. the drive unit of a light source in order to receive dim signal, comprising:
Temperature compensating element receives this dim signal;
Control unit has the light-adjusting module of negative light modulation, and the light-adjusting module of this negative light modulation couples this temperature compensating element, and produces the light modulation drive signal according to this dim signal; And
Driver element according to this light modulation drive signal, is adjusted the luminosity of this light source, and wherein when ambient temperature rose, this temperature compensating element was adjusted this dim signal, descends in order to do the electric current that makes this light source of flowing through.
18. the drive unit of light source according to claim 17, wherein this temperature compensating element is a diode.
19. the drive unit of light source according to claim 17, wherein this temperature compensating element is a thermistor.
20. the drive unit of light source according to claim 17, wherein dim signal is direct current signal or pulse width signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101543886A CN101155453A (en) | 2006-09-25 | 2006-09-25 | Light source driving device |
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|---|---|---|---|
| CNA2006101543886A CN101155453A (en) | 2006-09-25 | 2006-09-25 | Light source driving device |
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| CN101155453A true CN101155453A (en) | 2008-04-02 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101835299A (en) * | 2009-03-13 | 2010-09-15 | 上海飞锐光电科技有限公司 | Drive control circuit of LED fluorescent exciting light sources |
| CN101959346A (en) * | 2009-07-14 | 2011-01-26 | 艾沃特有限公司 | The self adaptation dimmer that is used for the LED lamp detects and control |
| CN102169672A (en) * | 2011-03-19 | 2011-08-31 | 福州华映视讯有限公司 | Backlight module, over-temperature protective circuit and over-temperature protective method |
| CN102625515A (en) * | 2011-01-31 | 2012-08-01 | 中强光电股份有限公司 | Light emitting diode drive device, method thereof and applied light source system thereof |
| CN103945601A (en) * | 2013-01-23 | 2014-07-23 | 英飞凌科技奥地利有限公司 | LED driver circuit |
| CN104320885A (en) * | 2014-11-04 | 2015-01-28 | 茅于海 | Temperature compensation type LED lamp drive circuit |
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| CN101835299B (en) * | 2009-03-13 | 2013-07-31 | 青岛海泰镀膜技术有限公司 | Drive control circuit of LED fluorescent exciting light sources |
| CN101835299A (en) * | 2009-03-13 | 2010-09-15 | 上海飞锐光电科技有限公司 | Drive control circuit of LED fluorescent exciting light sources |
| CN101959346A (en) * | 2009-07-14 | 2011-01-26 | 艾沃特有限公司 | The self adaptation dimmer that is used for the LED lamp detects and control |
| CN101959346B (en) * | 2009-07-14 | 2014-06-04 | 戴乐格半导体公司 | Adaptive dimmer detection and control for LED lamp |
| CN102625515A (en) * | 2011-01-31 | 2012-08-01 | 中强光电股份有限公司 | Light emitting diode drive device, method thereof and applied light source system thereof |
| CN102169672B (en) * | 2011-03-19 | 2014-02-26 | 福州华映视讯有限公司 | Backlight module, over-temperature protective circuit and over-temperature protective method |
| CN102169672A (en) * | 2011-03-19 | 2011-08-31 | 福州华映视讯有限公司 | Backlight module, over-temperature protective circuit and over-temperature protective method |
| CN103945601A (en) * | 2013-01-23 | 2014-07-23 | 英飞凌科技奥地利有限公司 | LED driver circuit |
| CN103945601B (en) * | 2013-01-23 | 2016-12-07 | 英飞凌科技奥地利有限公司 | LED driver circuit |
| CN104320885A (en) * | 2014-11-04 | 2015-01-28 | 茅于海 | Temperature compensation type LED lamp drive circuit |
| CN104320885B (en) * | 2014-11-04 | 2016-08-24 | 北京埃菲莱光电科技有限公司 | Temperature compensating type LED lamp drive circuit |
| CN110036301A (en) * | 2016-11-25 | 2019-07-19 | 伊莎贝尔努特·霍伊斯勒两合公司 | Current measuring device |
| CN110036301B (en) * | 2016-11-25 | 2021-09-17 | 伊莎贝尔努特·霍伊斯勒两合公司 | Current measuring device |
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