CN201616931U - LED light driving circuit - Google Patents
LED light driving circuit Download PDFInfo
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- CN201616931U CN201616931U CN2009202046358U CN200920204635U CN201616931U CN 201616931 U CN201616931 U CN 201616931U CN 2009202046358 U CN2009202046358 U CN 2009202046358U CN 200920204635 U CN200920204635 U CN 200920204635U CN 201616931 U CN201616931 U CN 201616931U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model relates to an LED light driving circuit, comprising a voltage-stabilizing circuit, a current-stabilizing circuit and a feedback circuit, wherein the voltage-stabilizing circuit provides and adjusts the driving voltages of an LED light; the current-stabilizing circuit provides stable driving current for the LED light; and the feedback circuit is respectively connected with the voltage-stabilizing circuit and the current-stabilizing circuit so as to collect electric signals of the current-stabilizing circuit and generate feedback signals, thus facilitating of the adjustment on the output voltage of the voltage-stabilizing circuit. The LED light driving circuit leads the voltage-stabilizing circuit and the current-stabilizing circuit to make synchronization adjustment by the feedback circuit, thus achieving the purposes of simultaneously adjusting and stabilizing the working current and working voltage of the LED light, improving the working efficiency of an illumination system and prolonging the service life of the illumination system.
Description
Technical field
The utility model relates to the drive circuit technical field, particularly a kind of LED lamp drive circuit.
Background technology
Along with intensifying of world energy sources crisis, cut down the consumption of energy, the protection environment has become common recognition.The LED illumination will replace the low first generation of efficiency and second generation lighting technology.During use, high-power LED illuminating lamp all adopts many LED lamp series connection, the mode of each cluster of lamps, ornamental individual drive.Because the characteristic of LED lamp requires constant pressure and flow to drive, so require the power supply of LED lamp all will provide several roads independent constant voltage constant current power simultaneously, and the design of LED lamp is target with energy-conservation, also requires the constant pressure and flow precision height of power supply, the efficient height, the life-span is long.Out of doors-condition of work of 40C-50C under, the LED lamp 3-5 that can work.
Fig. 4 is the circuit structure of the LED lamp drive circuit of prior art.With reference to Fig. 4, the drive circuit of existing LED illuminating lamp adopts operating voltage and the electric current of Voltage stabilizing module and current stabilization module controls LED respectively.
Fig. 5 is the LED lamp drive circuit structure of the linear current stabilization circuit of available technology adopting.With reference to Fig. 5, the output voltage of Voltage stabilizing module is the fixed value greater than series LED maximum forward conducting voltage, and promptly the input voltage of LED is not with the operating state adjustment of LED.The linear current stabilization technology of current stabilization module utilization is controlled the operating current of LED, by the electric current of Direct Sampling series LED, compares with reference data voltage, adjusts the conduction impedance of barretter, thus the operating current of control LED.Because the operating current of LED is along with its input voltage and temperature change, if adopting Switching Power Supply output galvanic current presses, again through too much organizing the linear circuit stabling current of adjusting, the output of realization multiple constant current, out of doors-condition of work of 40C-50C under, can not satisfy function, the requirement in efficient and life-span.And, press under the situation about setting at input voltage greater than series LED maximum forward conducting voltage, when working temperature reaches 50 ℃, LED reaches the forward conduction voltage minimum, the power consumption of linear barretter will reach maximum, the efficient of LED lamp system also can descend this moment, and the temperature of linear voltage-stabiliser tube raises simultaneously, makes shorten the useful life of LED lamp.
Fig. 6 is the LED lamp drive circuit structure of available technology adopting PWM current stabilization circuit.With reference to Fig. 6, the output voltage of Voltage stabilizing module is the fixed value greater than series LED maximum forward conducting voltage, and promptly the input voltage of LED is not with the operating state adjustment of LED.The current stabilization module utilizes current mode PWM to control the LED operating current.Press under the situation about setting at the input voltage of LED lamp greater than series LED maximum forward conducting voltage, when working temperature reaches 50 ℃, the LED lamp reaches the minimum value of forward conduction magnitude of voltage, and the duty ratio of BOOST converter will be retracted to minimum value, and the LED light fixture will reach best operating efficiency.But when working temperature reached-40 ℃, the LED lamp reached the maximum of forward conduction voltage, and the duty ratio of BOOST converter will reach maximum, and the efficient of LED lamp system will descend.And though this drive circuit can satisfy the driving requirement of LED lamp, the device of its use is more, and circuit is also complicated, makes cost higher.
In sum, existing technical scheme all can not be adjusted input voltage and the operating current of LED synchronously, and the power consumption of linear current stabilization technology is higher, and the use cost of PWM current stabilization technology is higher, all can not satisfy the specification requirement of high-power LED outdoor lamp fully.
The utility model content
Main goal of the invention of the present utility model provides a kind of LED lamp drive circuit, is intended to improve the operating efficiency of LED lamp, prolongs the useful life of illuminator.
The utility model LED lamp drive circuit comprises:
Voltage stabilizing circuit provides and regulates the driving voltage of LED lamp;
Current stabilization circuit can be the LED lamp stable drive current is provided;
Feedback circuit can be connected with current stabilization circuit with voltage stabilizing circuit respectively, can gather the signal of telecommunication of current stabilization circuit, and produces feedback signal, adjusts synchronously for voltage stabilizing circuit, current stabilization circuit.
Preferably, above-mentioned feedback circuit comprises:
Acquisition Circuit, the voltage of gathering the current stabilization circuit output be as sampled voltage, and send comparison circuit to;
Comparison circuit is connected with Acquisition Circuit, and produces level signal according to the variation of sampled voltage;
Switching circuit can be connected with comparison circuit and voltage stabilizing circuit respectively, according to the level signal generation feedback signal of comparison circuit output.
Preferably, above-mentioned comparison circuit can comprise voltage comparator and power supply, and the input of voltage comparator is connected with Acquisition Circuit and power supply respectively, the voltage that more described sampled voltage and power supply provide, and produce level signal.
Preferably, said switching circuit can comprise diode wherein the positive pole of diode be connected with the output of described voltage comparator, negative pole is connected with voltage stabilizing circuit.
Preferably, above-mentioned Acquisition Circuit can comprise first resistance-capacitance network and second resistance-capacitance network; The first capacitance-resistance networking can be serially connected in the output of current stabilization circuit and the in-phase input end of comparison circuit; One end ground connection of second resistance-capacitance network, the other end is connected with the in-phase input end of voltage comparator.
Preferably, above-mentioned comparison circuit also can comprise the 3rd resistance-capacitance network, and wherein the two ends of the 3rd resistance-capacitance network can connect the in-phase input end and the output of comparison circuit respectively.
Preferably, above-mentioned voltage stabilizing circuit can comprise at least one voltage-regulation unit, is and the voltage of LED lamp coupling that wherein said voltage-regulation unit can comprise voltage output end and pressure feedback port with input voltage regulation; Pressure feedback port can be connected with the output of described switching circuit, adjusts the voltage of voltage output end according to the change in voltage of switching circuit output.
Preferably, above-mentioned voltage-regulation unit is current mode or voltage type PWM DC/DC converter.
Preferably, above-mentioned current stabilization circuit can comprise operational amplifier, transistor and power supply; The in-phase input end of operational amplifier can be connected with power supply, and inverting input can be connected with transistorized source electrode, and output can be connected with transistorized grid; The resistance of can connecting between transistorized source electrode and the ground, drain electrode can be connected with the LED lamp.
Preferably, above-mentioned current stabilization unit also can comprise the 5th resistance-capacitance network, the 6th resistance-capacitance network, and the 5th resistance-capacitance network can be serially connected between the inverting input of described transistorized source electrode and operational amplifier; One end of the 6th resistance-capacitance network can be connected with the output of operational amplifier, and the other end can be connected with the inverting input of operational amplifier.
The utility model LED lamp drive circuit makes voltage stabilizing, current stabilization circuit adjust synchronously by feedback circuit, reaches to adjust simultaneously and the operating current of stable LED lamp, the purpose of operating voltage.Therefore, the utility model LED lamp drive circuit has solved the high problem of power consumption of prior art neutral line current stabilization circuit, has improved the efficient of illuminator, has prolonged the useful life of illuminator; And the electronic device that uses than the PWM current stabilization circuit is few, has saved cost.
Description of drawings
Fig. 1 is the structural representation of LED lamp drive circuit in the execution mode of the present utility model;
Fig. 2 is the electrical block diagram of LED lamp drive circuit among the embodiment of above-mentioned execution mode;
Fig. 3 is the structural representation of LED lamp drive circuit among another embodiment of above-mentioned execution mode;
Fig. 4 is the electrical block diagram of the LED lamp drive circuit of prior art;
Fig. 5 is the electrical block diagram of the LED lamp drive circuit of the linear current stabilization circuit of available technology adopting;
Fig. 6 is the electrical block diagram of the LED lamp drive circuit of available technology adopting PWM current stabilization circuit.
The realization of the utility model purpose, functional characteristics and advantage will be in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Fig. 1 shows the structure of the utility model LED lamp drive circuit.With reference to Fig. 1, this drive circuit comprises voltage stabilizing circuit 10, current stabilization circuit 20 and feedback circuit 30.Voltage stabilizing circuit 10 is connected with LED lamp 40, provides and regulate the driving voltage of LED lamp 40, i.e. the input voltage of LED lamp 40.Current stabilization circuit 20, output is connected with LED lamp 40, for LED lamp 40 provides stable electric current.Feedback circuit 30 is connected with voltage stabilizing circuit 10 and current stabilization circuit 20 respectively, gathers the signal of telecommunication of current stabilization circuit 20, and the signal of telecommunication that collects is produced feedback signal after treatment.Voltage stabilizing circuit 10 carries out the adjustment of output voltage according to feedback signal.
In the LED lamp course of work, the operating voltage of LED lamp 40 can reduce along with the rising of ambient temperature and the heating of self, and the electric current that then flows through LED lamp 40 can increase, and promptly the electric current of the output of current stabilization circuit 20 increases.Feedback circuit 30 will collect the variation of the output end current of current stabilization circuit 20, and produce a feedback signal, after voltage stabilizing circuit 10 receives this feedback signal, will reduce output voltage, thereby the electric current that flows through LED lamp 40 also will reduce.Feedback circuit 30 collects the variation of the electric current of LED lamp 40, produces feedback signal again, and voltage stabilizing circuit 10 carries out the adjustment of output voltage again according to feedback signal, thereby adjusts the operating current of LED lamp synchronously.Adjust through circulation repeatedly, make the input voltage of LED lamp 40 and the poised state that operating current reaches a best.
The utility model passes through feedback circuit, the signal of telecommunication of current stabilization circuit in the LED lamp drive circuit is fed back to voltage stabilizing circuit, voltage stabilizing circuit then carries out the adjustment of output voltage according to this feedback signal, thereby can adjust the operating current of LED lamp synchronously, make the input voltage and the operating current of LED lamp to adjust synchronously, and through the circulation adjustment can be so that the input voltage of LED lamp and operating current reach the poised state an of the best repeatedly, both reduce the power consumption of current stabilization circuit, also improved the operating efficiency of LED lamp.
Fig. 2 shows the circuit structure of LED lamp drive circuit among the embodiment of above-mentioned execution mode.With reference to Fig. 2, above-mentioned feedback circuit 30 comprises switching circuit 31, comparison circuit 32 and Acquisition Circuit 33.Comparison circuit 32 comprises voltage comparator U2 and power supply V3.Voltage comparator U2 comprises in-phase input end and inverting input, when the voltage of the in-phase input end voltage greater than inverting input, then exports high level; Otherwise output low level then.Power supply V3 provides a reference voltage, is connected with the inverting input of voltage comparator U2.Switching circuit 31 comprises diode D.The voltage of the output of Acquisition Circuit 33 collection current stabilization circuits 20 comprises the first resistance-capacitance network Z8 as sampled voltage, and the end of this first resistance-capacitance network Z8 is connected with the output of current stabilization circuit 20, and the other end is connected with the in-phase input end of voltage comparator U2.The output of voltage comparator U2 is connected with the positive pole of diode D.When sampled voltage during greater than reference voltage, voltage comparator U2 output high level then, diode D conducting; Otherwise, voltage comparator U2 output low level then, diode D ends.
In the foregoing description, above-mentioned Acquisition Circuit 33 also comprises the second resistance-capacitance network Z9.The end ground connection of the second resistance-capacitance network Z9, the other end is connected with the in-phase input end of voltage comparator U2.The first resistance-capacitance network Z8 and the second capacitance-resistance networking Z9 constitute pressure sampling circuit, not only can carry out the dividing potential drop sampling to the output of current stabilization circuit, and the output voltage of current stabilization circuit 20 is played good filter action.
In the foregoing description, above-mentioned comparison circuit 32 also comprises the 3rd resistance-capacitance network Z10.The end of the 3rd resistance-capacitance network Z10 is connected with the output of above-mentioned voltage comparator U2, and the other end is connected with the in-phase input end of above-mentioned voltage comparator U2.And second resistance-capacitance network Z9 and the 3rd resistance-capacitance network Z10 constitute source filter, eliminated the resonance that LC produces in the resistance-capacitance network well.
Above-mentioned voltage comparator U2 also can be other comparator device such as operational amplifier.Above-mentioned diode also can be other a unidirectional breakover element such as voltage-stabiliser tube.
In the foregoing description, voltage stabilizing circuit 10 comprises voltage regulator circuit 11.The voltage that this voltage-regulation unit 11 with input voltage regulation is and the LED lamp mates is connected with the output of switching circuit 31, adjusts the voltage of voltage regulator circuit 11 outputs according to the change in voltage of switching circuit 31 outputs.
In the foregoing description, voltage regulator circuit 11 is preferably voltage-type or current mode DC/DC converter PSU1, the pressure feedback port FB of this DC/DC converter PSU1 is connected with the output of said switching circuit 31, adjusts the voltage of voltage output end Vout according to the change in voltage of the output of switching circuit 31.Voltage output end Vout also is connected with pressure feedback port FB, makes the DC/DC converter can in time adjust the output of voltage according to the change in voltage of voltage output end Vout.For example, when the output voltage instability of DC/DC converter, when fluctuation occurring, this voltage output end Vout feeds back to output voltage values the pressure feedback port FB of DC/DC converter, the DC/DC converter is adjusted the voltage of output according to the change in voltage of pressure feedback port FB, until reaching stable state, thereby realized the purpose of voltage stabilizing.
In the foregoing description, voltage stabilizing circuit 10 also comprises the 4th resistance-capacitance network Z1 and the 5th resistance-capacitance network Z2.The 4th resistance-capacitance network Z1 connects with the 5th resistance-capacitance network Z2, and is serially connected between pressure feedback port FB and the ground, plays the effect of current limliting dividing potential drop and filtering in circuit.Because the magnitude of voltage of the pressure feedback port FB of DC/DC converter is smaller, the 4th resistance-capacitance network Z1, the 5th resistance-capacitance network Z2 can guarantee that the magnitude of voltage of pressure feedback port FB is in normal range (NR).
In the foregoing description, voltage stabilizing circuit 10 also comprises operational amplifier U1.This operational amplifier U1 can make the voltage decreases of voltage output end Vout, makes the voltage of input voltage feedback end FB satisfy normal range value.And this operational amplifier U1 can prevent that also the feedback signal of said switching circuit 31 from flowing into voltage input end and influencing the voltage of voltage output end Vout.The in-phase input end of operational amplifier U1 is connected with voltage output end Vout, and inverting input is connected altogether with the DC/DC converter, and output is connected with pressure feedback port FB.
In the foregoing description, voltage stabilizing circuit 10 can also comprise at least two DC/DC converter PSU1 series connection, make the output of feedback circuit 30 be connected with the pressure feedback port FB of each DC/DC converter respectively, further guaranteed the accurate adjustment of the output voltage of voltage stabilizing circuit 10.
In the foregoing description, current stabilization circuit 20 comprises operational amplifier U3, transistor Q1 and power supply V1.The in-phase input end of operational amplifier U3 is connected with power supply V1; Inverting input is connected with the source electrode of transistor Q1, and the 6th capacitance-resistance networking Z4 that connects between source electrode and the inverting input; Output is connected with the grid of transistor Q1.The resistance R 1 of connecting between the source electrode of transistor Q1 and the ground; Drain electrode is connected with LED lamp 40.
When the voltage of transistor Q1 drain electrode raise, operational amplifier U3 was then because the voltage of inverting input raises and the voltage that provides greater than power supply V1, and made the output voltage of operational amplifier U3 reduce, thereby reached the purpose of the electric current that reduces transistor Q1 drain electrode.
Above-mentioned current stabilization circuit 20 also comprises the 7th resistance-capacitance network Z3.The end of the 7th resistance-capacitance network Z3 is connected with the output of operational amplifier U3, and the other end is connected with the inverting input of operational amplifier U3.
Above-mentioned transistor can for metal-oxide semiconductor (MOS) (Metal-Oxide-SemiconductorField-Effect Transistor, MOSFET) or bipolar transistor (BIPOLAR TRANSISTOR).
The value of above-mentioned power supply V1 can be selected according to the characteristic of transistor Q1, makes transistor Q1 be in best operating state.
The above-mentioned first resistance-capacitance network Z8, the second resistance-capacitance network Z9, the 3rd resistance-capacitance network Z10, the 4th resistance-capacitance network Z1, the 5th resistance-capacitance network Z2, the 6th resistance-capacitance network Z4 and the 7th resistance-capacitance network Z3 are the R-C resistance-capacitance network, can determine the value of R and C in the syndeton of R and C and the structure according to the characteristic needs of circuit.
Fig. 3 shows the structure of LED lamp drive circuit among another embodiment of above-mentioned execution mode.With reference to Fig. 3, this LED lamp drive circuit can drive the LED lamp of multiple series series, comprises voltage stabilizing circuit 10, a plurality of current stabilization circuits 20 (1) ... 20 (n) and a plurality of feedback circuit 30 (1) ... 30 (n).A plurality of current stabilization circuit parallel connections, and be connected with voltage stabilizing circuit 10.The corresponding respectively LED lamp that connects a series connection of each current stabilization circuit.For example, current stabilization circuit 20 (1) is connected with LED lamp 40 (1), and feedback circuit 30 (1) is connected with voltage stabilizing circuit 10 and current stabilization circuit 20 (1) respectively, gathers the signal of telecommunication of current stabilization circuit 20 (1), and the generation feedback signal, adjust synchronously for voltage stabilizing circuit 10, current stabilization circuit 20 (1).Current stabilization circuit 20 (n) is connected with LED lamp 40 (n), feedback circuit 30 (n) is connected with voltage stabilizing circuit 10 and current stabilization circuit 20 (n) respectively, gather the signal of telecommunication of current stabilization circuit 20 (n), and produce feedback signal, adjust synchronously for voltage stabilizing circuit 10, current stabilization circuit 20 (n).Whichsoever the operating voltage of Chuan Lian LED lamp 40 has produced variation, feedback circuit 30 all can collect current stabilization circuit 20 outputs voltage variation and feed back to voltage stabilizing circuit 10 and adjust, thereby reach the synchronous adjustment of current stabilization circuit.
Can also be connected a logical circuit 50 between above-mentioned voltage stabilizing circuit 10 and the feedback circuit 30, after the feedback signal that a plurality of feedback circuits 30 are produced is carried out logical operation, import voltage stabilizing circuit 10 again.For example, the feedback signal that a plurality of feedback circuits 30 are produced is got maximum or the computing of averaging.
The voltage stabilizing circuit of above-mentioned LED lamp drive circuit, current stabilization circuit and feedback circuit also can be formed an integrated circuit, to make things convenient for large-scale production, greatly reduce manufacturing cost.
The utility model LED lamp drive circuit makes voltage stabilizing, current stabilization circuit adjust synchronously by feedback circuit, reaches to adjust simultaneously and the operating current of stable LED lamp, the purpose of operating voltage.Therefore, the utility model LED lamp drive circuit solved prior art neutral line current stabilization circuit the high problem of power consumption, improved the efficient of illuminator, prolonged the useful life of illuminator; And the electronic device that uses than the PWM current stabilization circuit is few, has saved cost.
The above only is a preferred embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (10)
1. a LED lamp drive circuit is characterized in that, comprising:
Voltage stabilizing circuit provides and regulates the driving voltage of LED lamp;
Current stabilization circuit is for the LED lamp provides stable drive current;
Feedback circuit is connected with voltage stabilizing circuit and current stabilization circuit respectively, gathers the signal of telecommunication of current stabilization circuit, and produces feedback signal, adjusts synchronously for voltage stabilizing circuit, current stabilization circuit.
2. LED lamp drive circuit as claimed in claim 1 is characterized in that, described feedback circuit comprises:
Acquisition Circuit, the voltage of gathering the current stabilization circuit output be as sampled voltage, and send comparison circuit to;
Comparison circuit is connected with Acquisition Circuit, and produces level signal according to the variation of sampled voltage;
Switching circuit is connected with comparison circuit and voltage stabilizing circuit respectively, according to the level signal generation feedback signal of comparison circuit output.
3. LED lamp drive circuit as claimed in claim 2, it is characterized in that described comparison circuit comprises voltage comparator and power supply, the input of voltage comparator is connected with Acquisition Circuit and power supply respectively, the voltage that more described sampled voltage and power supply provide, and produce level signal.
4. LED lamp drive circuit as claimed in claim 3 is characterized in that described switching circuit comprises diode, and wherein the positive pole of diode is connected with the output of described voltage comparator, and negative pole is connected with voltage stabilizing circuit.
5. LED lamp drive circuit as claimed in claim 4 is characterized in that, described Acquisition Circuit comprises first resistance-capacitance network and second resistance-capacitance network; The first capacitance-resistance networking is serially connected in the output of current stabilization circuit and the in-phase input end of comparison circuit; One end ground connection of second resistance-capacitance network, the other end is connected with the in-phase input end of comparison circuit.
6. LED lamp drive circuit as claimed in claim 5 is characterized in that described comparison circuit also comprises the 3rd resistance-capacitance network, and wherein said the 3rd resistance-capacitance network two ends connect the in-phase input end and the output of comparison circuit respectively.
7. as each described LED lamp drive circuit in the claim 1 to 6, it is characterized in that, described voltage stabilizing circuit comprises at least one voltage regulator circuit, is connected with the output of switching circuit, adjusts the voltage of voltage output end according to the change in voltage of switching circuit output.
8. LED lamp drive circuit as claimed in claim 7 is characterized in that, described voltage-regulation unit is the PWM DC/DC converter of current mode or voltage-type.
9. as each described LED lamp drive circuit in the claim 1 to 6, it is characterized in that described current stabilization circuit comprises operational amplifier and transistor and power supply; Wherein, the in-phase input end of operational amplifier is connected with power supply, and inverting input is connected with transistorized source electrode, and output is connected with transistorized grid; The resistance of connecting between transistorized source electrode and the ground, drain electrode is connected with the LED lamp.
10. LED lamp drive circuit as claimed in claim 9 is characterized in that, described current stabilization unit also comprises the 6th resistance-capacitance network and the 7th resistance-capacitance network; Wherein, the 6th resistance-capacitance network is serially connected between the inverting input of described transistorized source electrode and operational amplifier; One end of the 7th resistance-capacitance network is connected with the output of operational amplifier, and the other end is connected with the inverting input of operational amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202046358U CN201616931U (en) | 2009-09-14 | 2009-09-14 | LED light driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202046358U CN201616931U (en) | 2009-09-14 | 2009-09-14 | LED light driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201616931U true CN201616931U (en) | 2010-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009202046358U Expired - Lifetime CN201616931U (en) | 2009-09-14 | 2009-09-14 | LED light driving circuit |
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| CN (1) | CN201616931U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012088903A1 (en) * | 2010-12-30 | 2012-07-05 | 英飞特电子（杭州）有限公司 | Load driving device and system, limiting point control method and device |
-
2009
- 2009-09-14 CN CN2009202046358U patent/CN201616931U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012088903A1 (en) * | 2010-12-30 | 2012-07-05 | 英飞特电子（杭州）有限公司 | Load driving device and system, limiting point control method and device |
| US9185756B2 (en) | 2010-12-30 | 2015-11-10 | Inventronics (Hangzhou), Inc. | Load driving device and system, limiting point control method and device |
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Granted publication date: 20101027 |