CN103079307B - Constant voltage and constant current circuit for LED (light emitting diode) power supply - Google Patents
Constant voltage and constant current circuit for LED (light emitting diode) power supply Download PDFInfo
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a constant voltage and constant current circuit for an LED (light emitting diode) power supply, and belongs to the technical field of the LED driving power supply circuit. The technical key point for the constant voltage and constant current circuit is that the constant voltage and constant current circuit comprises an LLC (logical link control) resonance circuit, an output rectifying circuit and a load, wherein the LLC resonance circuit, the output rectifying circuit and the load are in circuit connection in sequence; a circuit between the LLC resonance circuit and the load is provided with a detection resistor Rsense; a circuit between the detection resistor Rsense and the LLC resonance circuit is provided with a voltage amplification circuit and a comparison amplifier IC103A which are connected in sequence; the forward direction input end of the comparison amplifier IC103A is respectively in circuit connection with one end of a resistor R105 and a shunt regulator IC104; the other end of a resistor R105 is connected with a comparator power supply VD; and the output end of the comparison amplifier IC103A is connected with a field-effect tube Q101, a resistor R108, an integrated regulator IC102 and a photoelectric coupler IC101 in sequence through a circuit. The invention aims to provide the constant voltage and constant current circuit for the LED power supply, which has the advantages of compact structure, low loss and high efficiency and is used for LED driving.
Description
Technical field
The present invention relates to a kind of LED power circuit, more particularly, particularly relate to a kind of LED power power-supply and determine constant-voltage current circuit.
Background technology
Along with the raising of semi-conducting material and packaging technology, luminous flux and the light extraction efficiency of LED are improved, and as a kind of solid state light emitter, have been widely used in street lamp, automotive lighting, traffic lighting, and gradually to public illumination and general lighting transition.Because LED has obvious light efficiency, meet the industrial policy of energy-saving and emission-reduction, be more and more widely used.
LED requires that forward voltage drives, because the light characteristic of LED is described as current function usually, instead of function of voltage, therefore adopt constant-current source to drive and better can control brightness.In addition, when LED forward voltage drop excursion is large, by the relation curve of forward voltage VF and forward current IF, the minor variations of VF can cause the larger change of IF, thus causes the larger change of brightness.Adopt constant voltage to drive the consistency being not easy guarantee LED luminance, and affect LED reliability, brightness, the life-span.Therefore LED light source all drives with constant-current source.
General large power supply is divided into two-stage circuit framework, the first order is power factor correcting apparatus, this partial circuit adopts booster circuit (Boost transducer), commercial power rectification is exported the output voltage boosting to 390V, power factor circuit reaches same-phase by input current and input voltage, make power factor close to 1, meet international norm.The second level is DC-DC converter, and 390V voltage good for power factor correction is changed into required voltage.
Current DC-DC converter adopts hard switching design, the switch hardware of hard switching DC-DC converter turns on and off circuit when bearing voltage or flow through electric current, therefore produce switching loss when opening or turn off, switching frequency is higher, and switching loss is larger.Therefore the switching frequency of hard switching direct current transducer can not be too high.This will diminish by changes persuing depressor further, also just constrains the size of power supply, and switching loss is large, and efficiency is also just poor.
In order to overcome the technology of hard switching, expedite the emergence of soft switch technique, the switching tube of Sofe Switch DC converter, to open or in turn off process, adopt zero voltage switching or zero current switching, this on-off mode reduces the vibration evoked of switching loss and switching process significantly, significantly can improve switching frequency, for the miniaturization of converter and modularization create conditions.
Meanwhile, in actual use, also there is many deficiencies in existing constant current circuit: (1) inductive reactance requires that value is comparatively large, and loss is comparatively large, affects efficiency.(2) off-line of transformer is very large, and the leakage inductance of each transformer, parasitic capacitance differs greatly, and causes control precision poor.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of compact conformation is provided, loss is low, LED power power-supply that efficiency is higher determines constant-voltage current circuit.
Technical scheme of the present invention is achieved in that a kind of LED power power-supply determines constant-voltage current circuit, comprise the LLC resonant circuit of sequentially circuit connection, output rectification circuit and load, circuit between wherein said LLC resonant circuit and load has been provided with detecting resistance Rsense, and the circuit between detecting resistance Rsense and LLC resonant circuit is sequentially connected with voltage amplifier circuit and comparison amplifier IC103A; The positive input of described comparison amplifier IC103A respectively circuit is connected with one end and the parallel voltage-stabilizing IC104 of resistance R105; The other end of described resistance R105 connects comparator power vd; The output of described comparison amplifier IC103A sequentially circuit is connected with field effect transistor Q101, resistance R108, integrated regulator IC102 and photoelectric coupling IC101; The G pole of described field effect transistor Q101 is connected with comparison amplifier IC103A, the reverse input end of comparison amplifier IC103A is connected with the output of comparison amplifier IC103B by resistance R103, the G pole of field effect transistor Q101 is connected with the output of comparison amplifier IC103A, D pole is connected with resistance R108, D pole is connected with resistance R108, and S pole is connected with power cathode; Be connected with resistance R109 between described integrated regulator IC102 and out-put supply positive pole, between described integrated regulator IC102 and out-put supply negative pole, be connected with resistance R110.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, and described voltage amplifier circuit is made up of comparison amplifier IC103B, resistance R101 and resistance R102; Described resistance R101 is arranged on the circuit between detecting resistance Rsense and comparison amplifier IC103B reverse input end; Described resistance R101 is arranged on the circuit between comparison amplifier IC103B reverse input end and output.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, circuit between the reverse input end of described comparison amplifier IC103A and output is sequentially in series with resistance R106 and electric capacity C101, the circuit between the reverse input end of described comparison amplifier IC103A and the output of comparison amplifier IC103B is provided with resistance R103.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, and described comparison amplifier IC103B is connected with electric capacity C102; Described electric capacity C102 one end is connected with the output of comparison amplifier IC103B, and the other end connects power cathode.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, and the circuit between described resistance R105 and photoelectric coupling IC101 is provided with current limliting divider resistance R104.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, and the circuit between described photoelectric coupling IC101 and positive source is provided with resistance R111.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, and described comparison amplifier IC103A circuit is connected with electric capacity C103; Described electric capacity C103 one end is connected with the positive input of comparison amplifier IC103A, other end ground connection.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, and described comparison amplifier IC103A circuit is connected with resistance R107, and described R107 one end is connected with the output of comparison amplifier IC103A, and the other end connects power cathode.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, described LLC resonant circuit is primarily of power switch tube S W1, power switch tube S W2, electric capacity C1, resonant capacitance Cr and transformer T101 primary coil composition, the emitter of described power switch tube S W1 is connected with the collector electrode of power switch tube S W2, and described electric capacity Cr one end is connected with the emitter of power switch tube S W1 and the collector electrode of power switch tube S W2; The two ends of described transformer T101 primary coil connect emitter and the electric capacity Cr other end of power switch tube S W2 respectively.
Above-mentioned a kind of LED power power-supply is determined in constant-voltage current circuit, described output rectification circuit is made up of transformer T101 secondary coil and diode group D3 parallel with one another and diode group D4, described transformer T101 secondary coil is made up of the coil of two group switching centre taps, and described diode group D3 and diode group D4 is separately positioned on corresponding coil; Described diode group D3 and diode group D4 is by two diode compositions in parallel.
After the present invention adopts said structure, by the voltage amplifier circuit of comparison amplifier IC103B, resistance R101 and resistance R102 composition, the resistance of detecting resistance significantly can be reduced, reach m Ω (milliohm) level, resistance loss almost can be ignored, and improves efficiency; Such detecting resistance Rsense is original 1/100.Simultaneously, the power supply of comparison amplifier IC103A is provided through resistance R105 by Voutput, the external parallel voltage-stabilizing IC104 of comparison amplifier IC103A, current potential is made to be stabilized in 2.5V, as reference potential, when the voltage that comparison amplifier IC103B amplifies is less than 2.5V, determine voltage status start, the voltage amplified as comparison amplifier IC103B is greater than 2.5V, to determine the state of electric current.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is circuit structure schematic diagram of the present invention.
In figure: LLC resonant circuit 1, output rectification circuit 2, load 3, voltage amplifier circuit 4.
Embodiment
Consult shown in Fig. 1, a kind of LED power power-supply of the present invention determines constant-voltage current circuit, comprise the LLC resonant circuit 1 of sequentially circuit connection, output rectification circuit 2 and load 3, circuit between LLC resonant circuit 1 and load 3 is provided with detecting resistance Rsense, the circuit between detecting resistance Rsense and LLC resonant circuit 1 has sequentially been connected with voltage amplifier circuit 4 and comparison amplifier IC103A; The positive input of described comparison amplifier IC103A respectively circuit is connected with one end of resistance R105 and one end of parallel voltage-stabilizing IC104; The other end of described resistance R105 connects comparator power vd; The other end ground connection of described parallel voltage-stabilizing IC104, the model of parallel voltage-stabilizing IC104 is GM431, and parallel voltage-stabilizing IC104 makes the current potential of comparison amplifier IC103A be stabilized in 2.5V, as reference potential.Meanwhile, comparison amplifier IC103A circuit is also connected with electric capacity C103; Described electric capacity C103 one end is connected with the positive input of comparison amplifier IC103A, other end ground connection, for strengthening the reference voltage stability of comparison amplifier IC103A positive input terminal.
Comparison amplifier IC103A is an amplifier IC module, be input as the induced current that comparison amplifier IC103B amplifies, carry out computing, adjustment output voltage, namely adjust the grid voltage Vgs of field effect transistor Q101, the electric current flowing through resistance R108 correspondingly changes, the setting end of integrated regulator IC102 output voltage or reference point voltage, and namely feedback resistance voltage VREF changes, by integrated regulator IC102, photoelectric coupling IC101, power supply IC process, reaches the object of determining electric current.
The output of described comparison amplifier IC103A sequentially circuit is connected with field effect transistor Q101, resistance R108, integrated regulator IC102 and photoelectric coupling IC101; Described field effect transistor Q101 is N-channel MOS pipe, i.e. N-MOS pipe, the G pole of described field effect transistor Q101 is connected with comparison amplifier IC103A, the reverse input end of comparison amplifier IC103A is connected with the output of comparison amplifier IC103B by resistance R103, the G pole of field effect transistor Q101 is connected with the output of comparison amplifier IC103A, D pole is connected with resistance R108, and D pole is connected with resistance R108, and S pole is connected with power cathode; Suppose that the G pole tension of field effect transistor Q101 is Vgate, cut-in voltage VT, saturation conduction voltage Vsat.Now field effect transistor Q101 has three state: as Vout < VT, field effect transistor Q101 is in cut-off state; As VT < Vout < Vsat, field effect transistor Q101 is in low-frequency transconductance state and magnifying state; As Vout > Vsat, field effect transistor Q101 is for being in saturation condition.
Be connected with resistance R109 between described integrated regulator IC102 and out-put supply positive pole, between described integrated regulator IC102 and out-put supply negative pole, be connected with resistance R110.Circuit between photoelectric coupling IC101 and positive source is provided with resistance R111.Particularly, in the present embodiment, resistance R108 one end connects the D pole of field effect transistor Q101, and the other end connects 1 pin of integrated regulator IC102.Resistance R109 one end connects 1 pin of integrated regulator IC102, and the other end connects out-put supply positive pole, and resistance R110 one end connects 1 pin of integrated regulator IC102, and the other end connects out-put supply negative pole (exporting ground connection).The model of integrated regulator IC102 is GM431, and for providing voltage control accurately, its 1 pin is stabilized in 2.5V, 2 pin connect 2 pin of photoelectric coupling IC101,3 pin connect out-put supply negative pole (exporting ground connection), and 1 pin voltage raises a little, and the electric current of 2 pin and 3 pin can raise by straight line.Resistance R111 one end connects 2 pin of photoelectric coupling IC101, and the other end connects out-put supply positive pole, serves the effect of LED current inside restriction photoelectric coupling IC101.Described comparison amplifier IC103A circuit is connected with resistance R107, described R107 one end is connected with the output (1 pin) of comparison amplifier IC103A, the other end connects power cathode, is being biased comparison amplifier IC103A output (1 pin) voltage Vout.
Further, circuit between the reverse input end and output of comparison amplifier IC103A is sequentially in series with resistance R106 and electric capacity C101, and the circuit between the reverse input end of described comparison amplifier IC103A and the output of comparison amplifier IC103B is provided with resistance R103.Electric capacity C101; resistance R106 and resistance R103 is the peripheral component of comparison amplifier IC103A; play frequency adjustment and compensating action; adjust corresponding parameter; LED is made to have some time just to arrive setting current value; when coupling LED just starts bright, temperature uprises, and electric current diminishes, and brightness diminishes and reaches the object of brightness stability and protection LED.
Circuit between resistance R105 and photoelectric coupling IC101 is provided with current limliting divider resistance R104.That is to say that resistance R104 one end connects out-put supply positive pole, one end connects comparator power vd, by the current limliting dividing potential drop effect of resistance, is supplied to the rational power supply of comparison amplifier.Certainly, low dropout voltage regulator (LDO) can also be selected as required.
In the present embodiment, LLC resonant circuit 1 is primarily of power switch tube S W1, power switch tube S W2, electric capacity C1, resonant capacitance Cr and transformer T101 primary coil composition, the emitter of described power switch tube S W1 is connected with the collector electrode of power switch tube S W2, and described electric capacity Cr one end is connected with the emitter of power switch tube S W1 and the collector electrode of power switch tube S W2; The two ends of described transformer T101 primary coil connect emitter and the electric capacity Cr other end of power switch tube S W2 respectively.Described output rectification circuit 2 is made up of transformer T101 secondary coil and diode group D3 parallel with one another and diode group D4, described transformer T101 secondary coil is made up of the coil of two group switching centre taps, and described diode group D3 and diode group D4 is separately positioned on corresponding coil; Described diode group D3 and diode group D4 is by two diode compositions in parallel.Described voltage amplifier circuit 4 and comparison amplifier IC103A are sequentially connected between transformer T101 secondary coil and detecting resistance Rsense.
Meanwhile, in the present embodiment, voltage amplifier circuit 4 is made up of comparison amplifier IC103B, resistance R101 and resistance R102; Described resistance R101 is arranged on the circuit between detecting resistance Rsense and comparison amplifier IC103B reverse input end; Described resistance R101 is arranged on the circuit between comparison amplifier IC103B reverse input end and output.β=R102/R101, if R102=100K, R101=1K, multiplication factor is 100 times, and detecting resistance Rsense is original 1/100 like this, and resistance is m Ω (milliohm) level, and resistance loss almost can be ignored, and improves efficiency.Further, electric capacity C102 is connected with at comparison amplifier IC103B; Described electric capacity C102 one end is connected with the output of comparison amplifier IC103B, other end ground connection.Overcome the impact of detecting resistance Rsense noise by electric capacity C102, the signal after comparison amplifier IC103B amplifies is stablized.
When the voltage that comparison amplifier IC103B amplifies is less than 2.5V, determine voltage status start, the voltage amplified as comparison amplifier IC103B is greater than 2.5V, to determine the state of electric current.Now determine the computing formula of electric current:
I constant＝2.5V/(Rsense*β)。(1)
From formula 1, suitably adjustment detecting resistance Rsense and β value, can reach required and determine current value.Now detect resistance Rsense can value very little.
Integrated regulator IC102 by the voltage responded to control the photophore electric current I ak of photoelectric coupling IC101, the change of the receiver electric current I ce of photoelectric coupling IC101 feeds back to power supply IC and carries out computing, the switching frequency of Modulating Power switching tube SW1 and power switch tube S W2, output voltage (or electric current) is change and then, reaches the object exporting and control.The accurate voltage of feedback voltage V ref of integrated regulator IC102 is 2.5V, when voltage is higher than 2.5V, by integrated regulator IC102, photoelectric coupling IC101, power supply IC process, turn down output voltage (or electric current), make the REF voltage of integrated regulator IC102 be precisely 2.5V.When the REF of integrated regulator IC102 is lower than 2.5V, heightens output voltage (or electric current) and make the REF voltage of integrated regulator IC102 be precisely 2.5V.
Suppose that resistance R108 and field effect transistor Q101 is inoperative, now voltage exports
Vmin＝2.5V*(R109+R110)/R110
Vmin＝2.5*R109/R110+2.5 (V) (2)
Suppose to open completely as field effect transistor Q101
Vmax＝2.5V*[R109+(R110//R108)]/(R110//R108)
Vmax＝2.5V*R109/(R110//R108)+2.5 (V) (3)
By formula 2,3 known V output are between V min ~ V max, ensure that LED operating voltage is in working range, when circuit start, when operating current does not reach set point, the G pole tension of field effect transistor Q101 is high voltage, and field effect transistor Q101 is in saturation conduction state, is now operated in constant voltage mode; When electric current reaches predetermined set value, field effect transistor Q101 is in magnifying state, now enters current-mode; When circuit does not reach the state of determining voltage or determining electric current, the voltage of integrated regulator IC102 is less than 2.5V, reception diode (3 inside photoelectric coupling IC101,4 pin) electric current is less, feed back to controller, reduce the frequency of power switch tube S W1 and power switch tube S W2 close to 50% work period, increase effective output; When circuit is greater than the state of determining voltage or determining electric current, the voltage of integrated regulator IC102 is greater than 2.5V, now 2 pin of integrated regulator IC102 and the electric current of 3 pin larger, flow through the light-emitting diode (1 inside photoelectric coupling IC101,2 pin) electric current larger, reception diode (3 inside photoelectric coupling IC101,4 pin) become large, feed back to controller process, increasing power switching tube SW1 and power switch tube S W2, close to the frequency of 50% work period, reduces effective output; When circuit working is determining voltage or determining the state of electric current, now enter dynamic equilibrium.
Claims (10)
1. a LED power power-supply determines constant-voltage current circuit, comprise the LLC resonant circuit (1) of sequentially circuit connection, output rectification circuit (2) and load (3), it is characterized in that, circuit between described LLC resonant circuit (1) and load (3) has been provided with detecting resistance Rsense, and the circuit between detecting resistance Rsense and LLC resonant circuit (1) is sequentially connected with voltage amplifier circuit (4) and comparison amplifier IC103A; The positive input of described comparison amplifier IC103A respectively circuit is connected with one end and the parallel voltage-stabilizing IC104 of resistance R105; The other end of described resistance R105 connects comparator power vd; The output of described comparison amplifier IC103A sequentially circuit is connected with field effect transistor Q101, resistance R108, integrated regulator IC102 and photoelectric coupling IC101; The G pole of described field effect transistor Q101 is connected with comparison amplifier IC103A, the reverse input end of comparison amplifier IC103A is connected with the output of comparison amplifier IC103B by resistance R103, the G pole of field effect transistor Q101 is connected with the output of comparison amplifier IC103A, D pole is connected with resistance R108, and S pole is connected with power cathode; Be connected with resistance R109 between described integrated regulator IC102 and out-put supply positive pole, between described integrated regulator IC102 and out-put supply negative pole, be connected with resistance R110.
2. a kind of LED power power-supply according to claim 1 determines constant-voltage current circuit, it is characterized in that, described voltage amplifier circuit (4) is made up of comparison amplifier IC103B, resistance R101 and resistance R102; Described resistance R101 is arranged on the circuit between detecting resistance Rsense and comparison amplifier IC103B reverse input end; Described resistance R101 is arranged on the circuit between comparison amplifier IC103B reverse input end and output.
3. a kind of LED power power-supply according to claim 2 determines constant-voltage current circuit, it is characterized in that, circuit between the reverse input end of described comparison amplifier IC103A and output is sequentially in series with resistance R106 and electric capacity C101, the circuit between the reverse input end of described comparison amplifier IC103A and the output of comparison amplifier IC103B is provided with resistance R103.
4. a kind of LED power power-supply according to claim 2 determines constant-voltage current circuit, it is characterized in that, described comparison amplifier IC103B is connected with electric capacity C102; Described electric capacity C102 one end is connected with the output of comparison amplifier IC103B, and the other end connects power cathode.
5. a kind of LED power power-supply according to claim 1 determines constant-voltage current circuit, it is characterized in that, the circuit between described resistance R105 and photoelectric coupling IC101 is provided with current limliting divider resistance R104.
6. a kind of LED power power-supply according to claim 1 determines constant-voltage current circuit, it is characterized in that, the circuit between described photoelectric coupling IC101 and positive source is provided with resistance R111.
7. a kind of LED power power-supply according to claim 1 determines constant-voltage current circuit, it is characterized in that, described comparison amplifier IC103A circuit is connected with electric capacity C103; Described electric capacity C103 one end is connected with the positive input of comparison amplifier IC103A, other end ground connection.
8. a kind of LED power power-supply according to claim 1 determines constant-voltage current circuit, it is characterized in that, described comparison amplifier IC103A circuit is connected with resistance R107, and described R107 one end is connected with the output of comparison amplifier IC103A, and the other end connects power cathode.
9. determine constant-voltage current circuit according to the arbitrary described a kind of LED power power-supply of claim 1 to 8, it is characterized in that, described LLC resonant circuit (1) is primarily of power switch tube S W1, power switch tube S W2, electric capacity C1, resonant capacitance Cr and transformer T101 primary coil composition, the emitter of described power switch tube S W1 is connected with the collector electrode of power switch tube S W2, and described electric capacity Cr one end is connected with the emitter of power switch tube S W1 and the collector electrode of power switch tube S W2; The two ends of described transformer T101 primary coil connect emitter and the electric capacity Cr other end of power switch tube S W2 respectively.
10. a kind of LED power power-supply according to claim 9 determines constant-voltage current circuit, it is characterized in that, described output rectification circuit (2) is made up of transformer T101 secondary coil and diode group D3 parallel with one another and diode group D4, described transformer T101 secondary coil is made up of the coil of two group switching centre taps, and described diode group D3 and diode group D4 is separately positioned on corresponding coil; Described diode group D3 and diode group D4 is by two diode compositions in parallel.
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| CN201210558354.9A CN103079307B (en) | 2012-12-18 | 2012-12-18 | Constant voltage and constant current circuit for LED (light emitting diode) power supply |
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| CN201210558354.9A CN103079307B (en) | 2012-12-18 | 2012-12-18 | Constant voltage and constant current circuit for LED (light emitting diode) power supply |
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| CN101227778B (en) * | 2008-02-19 | 2011-12-14 | 东南大学 | Self-excited oscillation type high power LED constant-current driving circuit |
| CN201252662Y (en) * | 2008-05-09 | 2009-06-03 | 深圳市东辰科技有限公司 | Constant current drive circuit for realizing high brightness LED lamp through utilizing switch power supply chip |
| CN201682667U (en) * | 2010-04-28 | 2010-12-22 | 罗晓琴 | Control circuit for automatically tracking driving voltage of LED |
| CN102209413B (en) * | 2010-08-16 | 2013-11-13 | 深圳市航嘉驰源电气股份有限公司 | Current feedback circuit and LED (light-emitting diode) lamp drive circuit |
| KR101822067B1 (en) * | 2010-10-28 | 2018-03-08 | 페어차일드코리아반도체 주식회사 | Led emitting device |
| JP5331154B2 (en) * | 2011-04-27 | 2013-10-30 | シャープ株式会社 | LED driving circuit and LED illumination lamp |
| CN102630114A (en) * | 2012-04-17 | 2012-08-08 | 泉芯电子技术(深圳)有限公司 | Closed-loop control LED (Light Emitting Diode) constant-current driving circuit |
| CN102665347B (en) * | 2012-05-09 | 2014-04-16 | 福建捷联电子有限公司 | Highly-efficient drive circuit of light emitting diode (LED) Light Bars |
| CN102802304A (en) * | 2012-07-11 | 2012-11-28 | 合肥华耀电子工业有限公司 | Novel low-cost multi-group constant current output circuit of LED (Light Emitting Diode) lighting power supply |
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Effective date of registration: 20170726 Address after: 528200, Guangdong, Foshan City, Nanhai District, lion Town, Luo village, Guangdong new light industry base, the core area of A District, one of the first floor of the 1 industrial plants Patentee after: FOSHAN RUIFENG LIGHTING CO., LTD. Address before: Yanbu Nanhai Dali 520000 Guangdong city of Foshan province to non-staple food market East Building A No. 1-3 shops Patentee before: Foshan Nanhai Jingyu Photoelectric Technology Co., Ltd. |
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