CN101742756A - Switching converter capable of feeding back light intensity signal and light-emitting device using same - Google Patents
Switching converter capable of feeding back light intensity signal and light-emitting device using same Download PDFInfo
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- CN101742756A CN101742756A CN200810177634A CN200810177634A CN101742756A CN 101742756 A CN101742756 A CN 101742756A CN 200810177634 A CN200810177634 A CN 200810177634A CN 200810177634 A CN200810177634 A CN 200810177634A CN 101742756 A CN101742756 A CN 101742756A
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Abstract
The invention relates to a switching converter capable of feeding back a light intensity signal and a light-emitting device using the same. The switching converter comprises a switching circuit, a feedback circuit and a control circuit, wherein the switching circuit converts a working electric signal so as to generate an output electric signal; the feedback circuit comprises at least one photo-detecting element and the photo-detecting element is used for detecting an external light so as to generate a feedback signal; and the control circuit receives the feedback signal, compares the feedback signal with a reference electric signal and, according to the comparison result, controls the switching circuit to adjust the output electric signal. The light-emitting device comprises at least one light-emitting element which emits lights after receiving a driving electric signal and the switching converter. The switching converter capable of feeding back the light intensity signal and the light-emitting device using the same can improve power efficiency of the light-emitting device and avoid unnecessary power consumption.
Description
Technical field
The present invention relates to a kind of light-emitting device that has the switch type converter of light intensity signal feedback and use it, particularly relate to a kind of with the light detecing element as the high efficiency switching type transducer of feedback circuit and use the light-emitting device of this switch type converter.
Background technology
In known techniques, use the luminescent system of light-emitting diode (LED) can comprise a smooth circuit for detecting mostly, the one purpose is the luminous intensity of being sent in order to the stabilized illumination system, detect the luminous intensity that luminescent system sends by the light circuit for detecting, again the luminous intensity and the default luminous intensity that are detected are compared, adjust the driving voltage of light-emitting diode again according to comparison result, by this luminous intensity that luminescent system sent is maintained default luminous intensity.This driving voltage is to be produced by voltage transformation module, and needs a feedback circuit input voltage can be converted to a specific voltage in the voltage transformation module.
And another purpose is in order to save the power consumption of luminescent system, the light circuit for detecting is the detecting surround lighting, when the luminous intensity that is detected is higher than an appointment luminous intensity, the surround lighting of expression luminescent system needs luminescent system luminous more enough by force and not, therefore light-emitting diode stops luminously, is lower than when specifying luminous intensity just driven for emitting lights led lighting up to the luminous intensity that is detected.
Seeing also shown in Figure 1ly, is the block diagram of the luminescent system of existing known techniques.The luminescent system 1 of known techniques comprises a light-emitting diode 11, one smooth circuit for detecting 12, a control module 13, an output voltage adjuster 132 and a voltage transformation module 14.Voltage transformation module 14 is to receive an operating voltage, and producing an output voltage 15, to give light-emitting diode 11 luminous with driven for emitting lights diode 11.Light circuit for detecting 12 is the luminous luminous intensities of detecting light-emitting diode 11, and the light intensity value of being detected 121 is sent to control module 13.Output voltage adjuster 132 is connected between control module 13 and the voltage transformation module 14, in order to the magnitude of voltage of the output signal (signal is a signal, and this paper all is called signal) of adjusting control module 13 to meet the requirement of voltage transformation module 14.
Traditional voltage transformation module 14 is to comprise a comparison circuit 141, a feedback circuit (be feedback circuit, this paper all is called feedback circuit) 142 and one change-over circuit 143 at least.Change-over circuit 143 is to raise or to reduce output voltage 15 by comparison circuit 141 controls, and feedback circuit 142 is the outputs that connect change-over circuit 143, input to comparison circuit 141 to receive output voltage 15 and to produce a feedback signal 144, the magnitude of voltage that comparison circuit 141 comparison feedback circuits 142 are returned is adjusted change-over circuit 143.
Yet, in the luminescent system of above-mentioned known techniques, behind light circuit for detecting 12 feedback light intensity levels, control voltage transformation module 14 again to change output voltage 15, and voltage transformation module 14 inside also have a feedback circuit 142 to come control output voltage 15, and this circuit design has the shortcoming that power usefulness is not high and consume unnecessary electric energy.
This shows that above-mentioned existing luminescent system obviously still has inconvenience and defective, and demands urgently further being improved in structure and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product does not have appropriate structure to address the above problem, this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of switch type converter of new structure and use its light-emitting device with light intensity signal feedback, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing luminescent system exists, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of the switch type converter of founding a kind of new structure and the light-emitting device that uses it with light intensity signal feedback, can improve general existing luminescent system, make it have more practicality.Through constantly research, design, and, create the present invention who has practical value finally through after studying sample and improvement repeatedly.
Summary of the invention
The objective of the invention is to, overcome the defective that existing luminescent system exists, and a kind of switch type converter with light intensity signal feedback of new structure is provided and uses its light-emitting device, technical problem to be solved is to make it improve the power usefulness of light-emitting device and avoid unnecessary power consumption.
Another object of the present invention is to, overcome the defective that existing luminescent system exists, and a kind of switch type converter with light intensity signal feedback of new structure is provided and uses its light-emitting device, to prolong the useful life of light-emitting component.
A further object of the present invention is, overcome the defective that existing luminescent system exists, and a kind of switch type converter with light intensity signal feedback of new structure is provided and uses its light-emitting device, technical problem to be solved is to make it control the luminous intensity of light-emitting component exactly.
The object of the invention to solve the technical problems realizes by the following technical solutions.According to a kind of switch type converter with light intensity signal feedback that the present invention proposes, it comprises: a change-over circuit is that conversion one work electrical signals is to produce an output electric property signal; One feedback circuit is to comprise at least one smooth detecing element, and this light detecing element is that detecting one exterior light is to produce a feedback signal; And a control circuit, be to receive this feedback signal, and compare this feedback signal and, and control this change-over circuit to adjust this output electric property signal according to comparison result with reference to electrical signals.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid switch type converter is to be a voltage-current converter, and this work electrical signals is to be a voltage signal, and this output electric property signal is to be a current signal.
Aforesaid switch type converter is to be an electric pressure converter, and this work electrical signals and this output electric property signal are to be voltage signal.
Aforesaid switch type converter, wherein said control circuit are to comprise a pulse-width modulation (Pulse Width Modulation, PWM) signal generating circuit and a switching element at least.
Aforesaid switch type converter, wherein said smooth detecing element are a silicon photoelectric diode (silicon photodiode) or a cadmium sulphide photoconductive cell (CdS photoresistor).
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of light-emitting device that the present invention proposes, it comprises: at least one light-emitting component is to receive one to drive electrical signals and luminous; And a switch type converter, be to comprise: a change-over circuit is that conversion one work electrical signals is to produce this driving electrical signals; One feedback circuit is to comprise at least one smooth detecing element, and this light detecing element is the luminous luminous intensity of this light-emitting component of detecting and produces a feedback signal; And a control circuit, be to receive this feedback signal, and compare this feedback signal and, and control this change-over circuit to adjust this driving electrical signals according to comparison result with reference to electrical signals.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid light-emitting device, wherein said switch type converter are voltage-current converters, and this work electrical signals is a voltage signal, and this driving electrical signals is a current signal.
Aforesaid light-emitting device, wherein said switch type converter are electric pressure converters, and this work electrical signals and this driving electrical signals are voltage signals.
Aforesaid light-emitting device, wherein said control circuit are to comprise a pulse-width modulation (PulseWidth Modulation, PWM) signal generating circuit and a switching element at least.
Aforesaid light-emitting device, wherein said smooth detecing element are a silicon photoelectric diode (siliconphotodiode) or a cadmium sulphide photoconductive cell (CdS photoresistor).
Aforesaid light-emitting device, wherein said light-emitting component are a light-emitting diode or a cold-cathode fluorescence lamp.
The object of the invention to solve the technical problems also realizes by the following technical solutions.According to a kind of light-emitting device that the present invention proposes, it comprises: at least one light-emitting component is to receive one to drive electrical signals and luminous; And a switch type converter, be to comprise: a change-over circuit is that conversion one work electrical signals is to produce this driving electrical signals; One feedback circuit is to comprise at least one smooth detecing element, and this light detecing element is the luminous intensity of detecting one surround lighting and produces a feedback signal; And a control circuit, be to receive this feedback signal, and compare this feedback signal and, and stop or starting this change-over circuit according to comparison result and export this driving electrical signals with reference to electrical signals.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid light-emitting device, wherein said switch type converter are voltage-current converters, and this work electrical signals is a voltage signal, and this driving electrical signals is a current signal.
Aforesaid light-emitting device, wherein said switch type converter are electric pressure converters, and this work electrical signals and this driving electrical signals are voltage signals.
Aforesaid light-emitting device, wherein said control circuit are to comprise a pulse-width modulation (PulseWidth Modulation, PWM) signal generating circuit and a switching element at least.
Aforesaid light-emitting device, wherein said smooth detecing element are a silicon photoelectric diode (siliconphotodiode) or a cadmium sulphide photoconductive cell (CdS photoresistor).
Aforesaid light-emitting device, wherein said light-emitting component are a light-emitting diode or a cold-cathode fluorescence lamp.
The present invention compared with prior art has tangible advantage and beneficial effect.By technique scheme, of the present invention have the switch type converter of light intensity signal feedback and use its light-emitting device to have following advantage and beneficial effect at least:
(1) compare with known techniques, light-emitting device of the present invention only with luminous intensity as the feedback signal source, and need not use other voltages or electric current as the feedback signal source.
(2) compare with known techniques, light-emitting device of the present invention can have higher power usefulness (powerefficiency), and can reduce power consumption.
(3) compare with known techniques, light-emitting device of the present invention can be adjusted the luminous intensity and the color of light-emitting component more accurately.
(4) compare with known techniques, light-emitting device of the present invention can prolong the useful life of light-emitting component.
In sum, the invention relates to a kind of light-emitting device that has the switch type converter of light intensity signal feedback and use it.At an embodiment, light-emitting device comprises a light-emitting component and a switch type converter.Light-emitting component is to receive one to drive electrical signals and luminous, and the electrical signals transducer comprises a change-over circuit, a feedback circuit and a control circuit.Change-over circuit is that conversion one work electrical signals drives electrical signals to produce this, and feedback circuit comprises a smooth detecing element, this light detecing element is that the luminous luminous intensity of detecting light-emitting component is to produce a feedback signal, and control circuit is to receive this feedback signal, and compare feedback signal and, and drive electrical signals to adjust this according to comparison result control transformation circuit with reference to electrical signals.At another embodiment, the light detecing element is detecting one surround lighting, and control circuit is to stop or starting change-over circuit according to comparison result to export this driving electrical signals.The present invention can improve the power usefulness of light-emitting device and avoid unnecessary power consumption.The present invention has obvious improvement technically, and has tangible good effect, really is a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is the block diagram of the luminescent system of known techniques.
Fig. 2 is the block diagram of light-emitting device of the present invention;
Fig. 3 is the schematic diagram of first embodiment of light-emitting device of the present invention.
Fig. 4 is the schematic diagram of second embodiment of light-emitting device of the present invention.
Fig. 5 to Fig. 7 is the schematic diagram of various signal waveforms of second embodiment of light-emitting device of the present invention.
Fig. 8 is the block diagram of the 3rd embodiment of light-emitting device of the present invention.
1: luminescent system 11: light-emitting diode
12: light circuit for detecting 121: the light intensity value of detecting
13: control module 131: default light intensity value
132: output voltage adjuster 14: voltage transformation module
141: comparison circuit 142: feedback circuit
143: change-over circuit 15: output voltage
2,3,4: light-emitting device 21: light-emitting component
22: switch type converter 221: the input electrical signals
222: drive electrical signals 23: change-over circuit
24: feedback circuit 241: feedback signal
25: control circuit 251: with reference to electrical signals
26: light detecing element 29: exterior light
31: light-emitting diode (LED) module 311: light-emitting diode
312: light beam 32: electric pressure converter
321: driving voltage 33: microprocessor
331,464-466: difference value 341:PWM signal generating circuit
342,431-434: electric crystal 343,471-473: diode
344: corresponding pwm signal 351,451-453: silicon photoelectric diode
353: light circuit for detecting 354: the luminous intensity magnitude of voltage
36: reference parameter 411: red light emitting diodes
412: green LED 413: blue LED
421-424: comparator 431-434: electric crystal
44: adder 451-453: a plurality of silicon photoelectric diodes
454: red light intensity magnitude of voltage 455: the green intensity magnitude of voltage
456: blue light strength magnitude of voltage 461: the ruddiness reference voltage level
462: green glow reference voltage level 463: the blue light reference voltage level
464: ruddiness difference value 465: the green glow difference value
466: blue light difference value 467: add resultant signal
468: serrated signal 469: difference signal
47: the time greeve controller 471-473: diode
481: red light-emitting control signal 482: the green luminescence control signal
483: blue light emitting control signal 49: power supply
491: inductance 51,52: time slot
82: electric pressure converter 891: electric charge mercury charge pump circuit
892: mode selection circuit
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, switch type converter that foundation the present invention is proposed and its embodiment of light-emitting device, structure, feature and the effect thereof of using it with light intensity signal feedback, describe in detail as after.
Seeing also shown in Figure 2ly, is the block diagram of light-emitting device of the present invention.Light-emitting device 2 of the present invention comprises a light-emitting component 21 and a switch type converter 22.
Above-mentioned switch type converter 22 is to receive an input electrical signals 221 and export one to drive electrical signals 222 to give light-emitting component 21 luminous with driven light-emitting element 21.
Above-mentioned switch type converter 22 comprises a change-over circuit 23, a feedback circuit 24 and a control circuit 25.This change-over circuit 23 drives electrical signals 222 in order to conversion input electrical signals 221 to produce; This feedback circuit 24 is to comprise a smooth detecing element 26 at least, and light detecing element 26 is luminous intensities of detecting one exterior light 29 and produces a feedback signal 241; These control circuit 25 receiving feedback signals 241, and compare feedback signal 241 and with reference to electrical signals 251, and according to comparison result control transformation circuit 23.
Wherein, the control model of this control circuit 25 can be different according to the application of light-emitting device 2.For example, when light detecing element 26 is set near the position of light-emitting component 21 with the luminous luminous intensity of detecting light-emitting component 21, be that exterior light 29 is sent light by light-emitting component 21, then control circuit 25 drives electrical signals 222 according to comparison result control transformation circuit 23 to adjust, adjust the luminous intensity of light detecing element 26 by this, make it maintain luminous intensity with reference to electrical signals 251 representatives.In addition, when light detecing element 26 set positions are in order to detect the luminous intensity of light-emitting device 2 surrounding environment, be that exterior light 29 is a surround lighting, then control circuit 25 stops or starting change-over circuit 23 output driving electrical signals 222 according to comparison result, even the luminous intensity of light-emitting device 2 environment of living in is higher than the luminous intensity with reference to electrical signals 251 representatives, represent that then environment is enough bright and light-emitting device 2 does not need luminous, drive electrical signals 222 so stop change-over circuit 23 outputs, be lower than luminous intensity up to the luminous intensity of surround lighting with reference to electrical signals 251 representatives, it is luminous with driven light-emitting element 21 that control circuit 25 is restarted change-over circuit 23 output driving electrical signals 222, so can reach the effect of saving light-emitting device 2 power consumptions.
Wherein, above-mentioned switch type converter 22 can be an electric pressure converter or a voltage-current converter, and when switch type converter 22 was an electric pressure converter, input electrical signals 221 and driving electrical signals 222 were all voltage signal; When switch type converter 22 was a voltage-current converter, input electrical signals 221 was a voltage signal, is current signal and drive electrical signals 222.
Above-mentioned light-emitting component 21 can comprise a light-emitting diode or a cold-cathode fluorescence lamp.When light-emitting component 21 comprises the light-emitting diode of a plurality of different colours, feedback circuit 24 is to comprise a plurality of corresponding smooth detecing elements, and each light detecing element has a filter, the luminous intensity that makes these a little light detecing elements can detect side different colours light respectively, by this, the glow color or the colour temperature of light-emitting component 21 can further be kept or adjust to control circuit 25.
In addition, this feedback circuit 24 can comprise other elements according to different control circuit 25, and for example, if control circuit 25 is a digitial controller, then feedback circuit 24 can increase an analog-digital converter (ADC); If control circuit 25 is an adder, then feedback circuit 24 can increase an inverter (inverter, or be called inverter).
This light detecing element 26 is preferably a silicon photoelectric diode (silicon photodiode) or a cadmium sulphide photoconductive cell (CdS photoresistor).
In addition, switch type converter 22 optionally more can comprise a charge pump (charge pump) circuit and mode selection circuit,
Seeing also shown in Figure 3ly, is the schematic diagram of first embodiment of light-emitting device of the present invention.The light-emitting device 3 of the first embodiment of the present invention comprises a light-emitting diode (LED) module 31 and an electric pressure converter 32.
Above-mentioned light-emitting diode (LED) module 31 comprises a plurality of light-emitting diodes 311, and these a little light-emitting diodes 311 are being connected in series among the figure, but optionally these a little light-emitting diodes 311 can also be connected in parallel.Light-emitting diode (LED) module 31 is to receive the driving voltage 321 that electric pressure converter 32 is exported, and then driven for emitting lights diode 311 sends light beam 312.
Above-mentioned electric pressure converter 32 comprises a microprocessor 33, a pulse-width modulation (PULSE WIDTHMODULATION, PWM) signal generating circuit 341, an electric crystal 342, a diode 343, a silicon photoelectric diode 351, an and smooth circuit for detecting 353.Silicon photoelectric diode 351 1 ends connect an input voltage, and an end connects light circuit for detecting 353.When silicon photoelectric diode 351 received light beam 312, silicon photoelectric diode 351 was corresponding photoelectric currents of luminous intensity of generation and light beam 312, and photoelectric current makes light circuit for detecting 353 outputs one luminous intensity magnitude of voltage 354 to microprocessor 33 by light circuit for detecting 353.
This microprocessor 33 is difference value 331 of calculating reference parameter 36 and luminous intensity magnitude of voltage 354, and transmits difference value 331 to pwm signal generation circuit 341.Pwm signal generation circuit 341 produces corresponding pwm signal 344 according to difference value 331, is in conducting state or closed condition in order to control electric crystal 342.During the low-potential signal of pwm signal 344, electric crystal 342 is in closed condition, and diode 343 conductings, makes light-emitting diode (LED) module 31 receive driving voltage 321 and luminous.On the contrary, during the high potential signal of pwm signal 344, electric crystal 342 is in conducting state, and diode 343 is closed, make light-emitting diode (LED) module 31 can't receive driving voltage 321 and stop luminous, therefore, by adjusting work period (the duty cycle of pwm signal 344, be during the high potential signal with low-potential signal during ratio), the luminous intensity of the just adjustable optical diode module 31 of haircuting.
Seeing also shown in Figure 4ly, is the schematic diagram of second embodiment of light-emitting device of the present invention.The light-emitting device 4 of the second embodiment of the present invention comprises the blue LED 413 of the green LED 412 of the red light emitting diodes 411 of a plurality of series connection, a plurality of series connection, a plurality of series connection, a plurality of comparator 421-424, a plurality of electric crystal 431-434, an adder 44, a plurality of silicon photoelectric diode 451-453, a plurality of diode 471-473 and greeve controller (time slot controller, or be called time slot controller) 47 for the moment.
Part at the driven for emitting lights led lighting, be to control the luminous luminous intensity of light-emitting device 4 by comparator 424, electric crystal 434 and diode 471-473, and the time greeve controller 47 and electric crystal 431-433 be ratio in order to control ruddiness, green glow and blue light, to adjust light-emitting device 4 luminous color or colour temperature.Detailed description is at the back segment content description.Silicon photoelectric diode 451-453 disposes a ruddiness filter, a green glow filter and a blue filter respectively, in order to detect the luminous intensity of ruddiness, blue light and green glow in the light beam that these a little light-emitting diode 411-413 are sent respectively.For easy understanding, above-mentioned filter is not illustrated among Fig. 4.
Similar to the operation principles of silicon photoelectric diode shown in Figure 3, silicon photoelectric diode 451-453 receive the light beam that light-emitting diode 411-413 sent after, just produce a red light intensity magnitude of voltage 454, a green intensity magnitude of voltage 455 and a blue light strength magnitude of voltage 456.The input of comparator 421-423 is to receive a ruddiness reference voltage level 461, a green glow reference voltage level 462 and a blue light reference voltage level 463 respectively, and the other end is to receive red light intensity magnitude of voltage 454, green intensity magnitude of voltage 455 and blue light strength magnitude of voltage 456 respectively.Each comparator is a difference value of calculating the input signal values of two inputs, therefore the output of comparator 421-423 is exported ruddiness difference value 464, green glow difference value 465 and blue light difference value 466 respectively, and these a little difference value 464-466 are sent to adder 44 to add up, and greeve controller 47 when being sent to.Adder 44 outputs one add the input of resultant signal 467 to comparator 424, and another input of comparator 424 is to receive a serrated signal 468, and the output of comparator 424 is that output adds the difference signal 469 of resultant signal 467 and serrated signal 468 to electric crystal 434.Please consult Fig. 5 simultaneously, when adding resultant signal 467 and be lower than serrated signal 468, difference signal 469 is a negative value, shown in time slot 51, otherwise when adding resultant signal 467 and be higher than serrated signal 468, difference signal 469 be on the occasion of, shown in time slot 52.
The time after greeve controller 47 receives ruddiness difference value 464, green glow difference value 465 and blue light difference value 466, be output corresponding red light-emitting control signal 481, green luminescence control signal 482 and blue light emitting control signal 483, its wave mode as shown in Figure 5.Wherein, red light-emitting control signal 481, green luminescence control signal 482 and blue light emitting control signal 483 are all cyclical signal, its cycle is the multiple for the cycle of difference signal 469, and the led control signal 481-483 that Fig. 5 illustrated is for example with the cycle of 12 difference signals 469.When difference signal 469 is in the electronegative potential time slot, diode 471-473 conducting, then make the electric crystal that connect light-emitting diode be in conducting state if led control signal is a high potential this moment, and electric current can be imported light-emitting diode and make lumination of light emitting diode.With Fig. 5 is example, it is luminous that red light-emitting diode 411 has the period of 2 time slots 51 to be driven, and that green light LED 412 has the period of 3 time slots 51 to be driven is luminous, and that blue light-emitting diode 413 has the period of 7 time slots 51 to be driven is luminous, therefore, if the luminous efficiency of each light-emitting diode is identical, then the ratio of the ruddiness, green glow and the blue light that send of light-emitting device 4 is 2: 3: 7.If the light of this color-ratio is compared with preset value, the too strong and green glow of blue light too a little less than, greeve controller 47 can shorten the high potential time of blue light emitting control signal 483 in the time of then, and prolong the high potential time of green luminescence control signal 482, as shown in Figure 6, so can be under the luminous intensity that does not change light-emitting device 4, the ratio of ruddiness, green glow and blue light that adjustment light-emitting device 4 sends is 2: 4: 6, and can repeat in this way, up to ruddiness difference value 464, green glow difference value 465 and blue light difference value 466 near 0.In addition, if the luminous intensity of light-emitting device 4 is low excessively, to make the magnitude of voltage that adds resultant signal 467 rise, as shown in Figure 7, the time shortening that the magnitude of voltage that adds resultant signal 467 rises and causes time slot 51, the time lengthening of time slot 52, therefore, increase owing to connect 491 driven times of inductance of power supply 49, the luminous intensity that causes inductance energy to strengthen with electroluminescent devices 4 increases, and the constant rate of ruddiness, green glow and blue light.Similarly, if during the luminous intensity grow of light-emitting device 4, the magnitude of voltage that then adds resultant signal 467 can descend and cause the time lengthening of time slot 51, and the time of time slot 52 shortens, and then makes the luminous intensity of light-emitting device 4 die down and keep light color.
Please note; in above-mentioned first embodiment and second embodiment; be to adjust the luminous intensity of light-emitting component to change driving voltage; but not as limit; the designer also can conceptual design according to the present invention has the voltage current adapter of optical detector; and export a drive current by voltage current adapter and come the driven for emitting lights led lighting, this kind light-emitting device is also in protection scope of the present invention.
Seeing also shown in Figure 8ly, is the block diagram of the 3rd embodiment of light-emitting device of the present invention.The third embodiment of the present invention is different with other embodiment is in the electric pressure converter 82 of the light-emitting device 8 of the 3rd embodiment and comprises a charge pump circuit 891 and a mode selection circuit 892, when even the pwm signal that causes pwm signal generation circuit 341 output duty cycles 100% a little less than excessively when luminous intensity that light detecing element 26 is detected also can't driven light-emitting element sends default luminous intensity, mode selection circuit 892 is that setting charge pump circuit 891 is 1.5 multiplication die pressing types or 2 times of multiplication die pressing types, increase the amplitude of driving voltage, light-emitting component 21 is driven sends default luminous intensity.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the technology contents that can utilize above-mentioned announcement is made a little change or is modified to the equivalent embodiment of equivalent variations, in every case be not break away from the technical solution of the present invention content, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (17)
1. one kind has the switch type converter that light intensity signal feeds back, and it is characterized in that it comprises:
One change-over circuit is that conversion one work electrical signals is to produce an output electric property signal;
One feedback circuit is to comprise at least one smooth detecing element, and this light detecing element is that detecting one exterior light is to produce a feedback signal; And
One control circuit is to receive this feedback signal, and compares this feedback signal and with reference to electrical signals, and controls this change-over circuit to adjust this output electric property signal according to comparison result.
2. switch type converter according to claim 1 is characterized in that wherein said switch type converter is to be a voltage-current converter, and this work electrical signals is to be a voltage signal, and this output electric property signal is to be a current signal.
3. switch type converter according to claim 1 is characterized in that wherein said switch type converter is to be an electric pressure converter, and this work electrical signals and this output electric property signal are to be voltage signal.
4. switch type converter according to claim 1 is characterized in that wherein said control circuit is to comprise a pulse-width modulation signal generating circuit and at least to switch element.
5. switch type converter according to claim 1 is characterized in that wherein said smooth detecing element is a silicon photoelectric diode or a cadmium sulphide photoconductive cell.
6. light-emitting device is characterized in that comprising:
At least one light-emitting component is to receive one to drive electrical signals and luminous; And
One switch type converter is to comprise:
One change-over circuit is that conversion one work electrical signals is to produce this driving electrical signals;
One feedback circuit is to comprise at least one smooth detecing element, and this light detecing element is the luminous luminous intensity of this light-emitting component of detecting and produces a feedback signal; And
One control circuit is to receive this feedback signal, and compares this feedback signal and with reference to electrical signals, and controls this change-over circuit to adjust this driving electrical signals according to comparison result.
7. light-emitting device according to claim 6 is characterized in that wherein said switch type converter is a voltage-current converter, and this work electrical signals is a voltage signal, and this driving electrical signals is a current signal.
8. light-emitting device according to claim 6 is characterized in that wherein said switch type converter is an electric pressure converter, and this work electrical signals and this driving electrical signals are voltage signals.
9. light-emitting device according to claim 6 is characterized in that wherein said control circuit is to comprise a pulse-width modulation signal generating circuit and at least to switch element.
10. light-emitting device according to claim 6 is characterized in that wherein said smooth detecing element is a silicon photoelectric diode or a cadmium sulphide photoconductive cell.
11. light-emitting device according to claim 6 is characterized in that wherein said light-emitting component is a light-emitting diode or a cold-cathode fluorescence lamp.
12. a light-emitting device is characterized in that comprising:
At least one light-emitting component is to receive one to drive electrical signals and luminous; And
One switch type converter is to comprise:
One change-over circuit is that conversion one work electrical signals is to produce this driving electrical signals;
One feedback circuit is to comprise at least one smooth detecing element, and this light detecing element is the luminous intensity of detecting one surround lighting and produces a feedback signal; And
One control circuit is to receive this feedback signal, and compares this feedback signal and with reference to electrical signals, and stops or starting this change-over circuit according to comparison result and export this driving electrical signals.
13. light-emitting device according to claim 12 is characterized in that wherein said switch type converter is a voltage-current converter, this work electrical signals is a voltage signal, and this driving electrical signals is a current signal.
14. light-emitting device according to claim 12 is characterized in that wherein said switch type converter is an electric pressure converter, this work electrical signals and this driving electrical signals are voltage signals.
15. light-emitting device according to claim 12 is characterized in that wherein said control circuit is to comprise a pulse-width modulation signal generating circuit and at least to switch element.
16. light-emitting device according to claim 12 is characterized in that wherein said smooth detecing element is a silicon photoelectric diode or a cadmium sulphide photoconductive cell.
17. light-emitting device according to claim 12 is characterized in that wherein said light-emitting component is a light-emitting diode or a cold-cathode fluorescence lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810177634A CN101742756A (en) | 2008-11-17 | 2008-11-17 | Switching converter capable of feeding back light intensity signal and light-emitting device using same |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810177634A CN101742756A (en) | 2008-11-17 | 2008-11-17 | Switching converter capable of feeding back light intensity signal and light-emitting device using same |
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| CN101742756A true CN101742756A (en) | 2010-06-16 |
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| CN200810177634A Pending CN101742756A (en) | 2008-11-17 | 2008-11-17 | Switching converter capable of feeding back light intensity signal and light-emitting device using same |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469650A (en) * | 2010-11-08 | 2012-05-23 | 登丰微电子股份有限公司 | Conversion control circuit |
| CN102905421A (en) * | 2012-09-14 | 2013-01-30 | 东莞中山大学研究院 | Method and device for realizing automatic adjustment of LED (light-emitting diode) lamps |
| TWI552645B (en) * | 2015-03-18 | 2016-10-01 | 隆達電子股份有限公司 | Dimming circuit |
| CN106163008A (en) * | 2016-08-12 | 2016-11-23 | 苏州加士革电子科技有限公司 | A kind of intelligent optical sensing with an automatic light meter for LED and light adjusting circuit |
| CN110021261A (en) * | 2018-06-28 | 2019-07-16 | 京东方科技集团股份有限公司 | A kind of array substrate and its driving method, display panel |
| CN110730537A (en) * | 2018-06-28 | 2020-01-24 | 法雷奥照明公司 | System for controlling power supply of pixelated light source |
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2008
- 2008-11-17 CN CN200810177634A patent/CN101742756A/en active Pending
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469650A (en) * | 2010-11-08 | 2012-05-23 | 登丰微电子股份有限公司 | Conversion control circuit |
| CN102469650B (en) * | 2010-11-08 | 2014-07-23 | 登丰微电子股份有限公司 | Conversion control circuit |
| CN102905421A (en) * | 2012-09-14 | 2013-01-30 | 东莞中山大学研究院 | Method and device for realizing automatic adjustment of LED (light-emitting diode) lamps |
| TWI552645B (en) * | 2015-03-18 | 2016-10-01 | 隆達電子股份有限公司 | Dimming circuit |
| US9474115B2 (en) | 2015-03-18 | 2016-10-18 | Lextar Electronics Corporation | Dimming circuit |
| CN106163008A (en) * | 2016-08-12 | 2016-11-23 | 苏州加士革电子科技有限公司 | A kind of intelligent optical sensing with an automatic light meter for LED and light adjusting circuit |
| CN106163008B (en) * | 2016-08-12 | 2017-11-28 | 苏州加士革电子科技有限公司 | It is a kind of for LED Intelligent light sensings with an automatic light meter should and light adjusting circuit |
| CN110021261A (en) * | 2018-06-28 | 2019-07-16 | 京东方科技集团股份有限公司 | A kind of array substrate and its driving method, display panel |
| CN110730537A (en) * | 2018-06-28 | 2020-01-24 | 法雷奥照明公司 | System for controlling power supply of pixelated light source |
| US11315479B2 (en) | 2018-06-28 | 2022-04-26 | Boe Technology Group Co., Ltd. | Array substrate and method for driving the same, display panel |
| US11869413B2 (en) | 2018-06-28 | 2024-01-09 | Boe Technology Group Co., Ltd. | Pixel circuit, array substrate comprising the same and display panel |
| CN110730537B (en) * | 2018-06-28 | 2024-01-30 | 法雷奥照明公司 | System for controlling power supply of pixelated light sources |
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Application publication date: 20100616 |