CN202310246U - Light-emitting diode (LED) driver circuit - Google Patents
Light-emitting diode (LED) driver circuit Download PDFInfo
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- CN202310246U CN202310246U CN2011204532057U CN201120453205U CN202310246U CN 202310246 U CN202310246 U CN 202310246U CN 2011204532057 U CN2011204532057 U CN 2011204532057U CN 201120453205 U CN201120453205 U CN 201120453205U CN 202310246 U CN202310246 U CN 202310246U
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Abstract
The utility model discloses a light-emitting diode (LED) driver circuit, which comprises an electromagnetic interference suppression circuit, a bridge rectifying and filtering circuit, a high-frequency transformer, an output rectifying circuit, a switching tube, a current detection circuit, a sampling feedback circuit and an LED driver module integrated circuit, wherein an input end of the electromagnetic interference suppression circuit is connected with an alternating current power supply, and an output end of the electromagnetic interference suppression circuit is connected with an input end of the bridge rectifying and filtering circuit; the input end of the bridge rectifying and filtering circuit is connected with the output end of the electromagnetic interference suppression circuit, and an output end of the bridge rectifying and filtering circuit is connected with an input end of the high-frequency transformer; the input end of the high-frequency transformer is connected with the output end of the bridge rectifying and filtering circuit, and an output end of the high-frequency transformer is connected with an input end of the switching tube and an input end of the output rectifying circuit; and the input end of the output rectifying circuit is connected with the output end of the high-frequency transformer, and an output end of the output rectifying circuit is connected with an LED lamp which serves as a load.
Description
Technical field
The utility model relates to circuit field, relates more specifically to a kind of led driver circuit.
Background technology
Under the background that global energy shortage, environmental consciousness improve constantly, the green energy conservation illumination is all being greatly developed in countries in the world.Light-emitting diode (LED) illumination receives the great attention of country and governments at all levels, just in develop rapidly as the strategic new industry of energy-conserving and environment-protective.Therefore, the requirement of led driver circuit is also improving constantly, and high reliability, high efficiency, high constant current accuracy, low system cost, little circuit size and safety isolation etc. become the guardian technique index of led driver circuit.Led driver circuit originally adopts secondary side constant current controlling schemes, complex structure, and components and parts are many, and system cost is high, is unfavorable for dwindling the volume of led driver.
The utility model content
Problem in view of the above, the utility model provide a kind of led driver circuit of novelty.
Led driver circuit according to the embodiment of the utility model comprises electromagnetic interference suppression circuit, bridge rectifier filter circuit, high frequency transformer, output rectification circuit, switching tube, power supply circuits, sampling feedback circuit, led driver modular integrated circuit and current detection circuit.Wherein, the input of electromagnetic interference suppression circuit is connected with AC power, and output is connected with the input of bridge rectifier filter circuit; The input of bridge rectifier filter circuit is connected with the output of electromagnetic interference suppression circuit, and output is connected with the input of high frequency transformer, the input of power supply circuits and the input of led driver modular integrated circuit; The input of high frequency transformer is connected with the output of bridge rectifier filter circuit, and output is connected with the input of output rectification circuit, the input of switching tube and the input of power supply circuits; The input of output rectification circuit is connected with the output of high frequency transformer, and output is connected with LED lamp as load; The input of switching tube is connected with the output of the output of high frequency transformer with the led driver modular integrated circuit, and output is connected with the input of current detection circuit; The input of power supply circuits is connected with the output of the output of bridge rectifier filter circuit and high frequency transformer, and output is connected with the input of sampling feedback circuit and the input of led driver modular integrated circuit; The input of sampling feedback circuit is connected with the output of power supply circuits, and output is connected with the input of led driver modular integrated circuit; The input of led driver modular integrated circuit is connected with the output of the output of bridge rectifier filter circuit, power supply circuits, the output of sampling feedback circuit and the output of current detection circuit, and output is connected with switching tube; And the input of current detection circuit is connected with output end of switching tube, and output is connected with the input of led driver modular integrated circuit.The output rectification circuit output rectification circuit
Led driver circuit according to another embodiment of the utility model comprises bridge rectifier filter circuit, electromagnetic interference suppression circuit, high frequency transformer, output rectification circuit, switching tube, power supply circuits, sampling feedback circuit, led driver modular integrated circuit and current detection circuit.Wherein, the input of bridge rectifier filter circuit is connected with AC power via fusing resistor, and output is connected with the input of electromagnetic interference suppression circuit; The input of electromagnetic interference suppression circuit is connected with the output of bridge rectifier filter circuit, and output is connected with the input of high frequency transformer, the input of power supply circuits and the input of led driver modular integrated circuit; The input of high frequency transformer is connected with the output of electromagnetic interference suppression circuit, and output is connected with the input of output rectification circuit, the input of switching tube and the input of power supply circuits; The input of output rectification circuit is connected with the output of high frequency transformer, and output is connected with LED lamp as load; The input of switching tube is connected with the output of the output of high frequency transformer with the led driver modular integrated circuit, and output is connected with the input of current detection circuit; The input of power supply circuits is connected with the output of the output of electromagnetic interference suppression circuit and high frequency transformer, and output is connected with the input of sampling feedback circuit and the input of led driver modular integrated circuit; The input of sampling feedback circuit is connected with the output of power supply circuits, and output is connected with the input of led driver modular integrated circuit; The input of led driver modular integrated circuit is connected with the output of the output of electromagnetic interference suppression circuit, power supply circuits, the output of sampling feedback circuit and the output of current detection circuit, and output is connected with switching tube; And the input of current detection circuit is connected with output end of switching tube, and output is connected with the input of led driver modular integrated circuit.
The utility model has overcome the defective of prior art and provides a kind of high efficiency, high reliability, full voltage input range and system cost low isolated form constant-current LED driver circuit, has that circuit is simple, components and parts are few, volume is little and characteristics such as efficient height.
Description of drawings
From below in conjunction with accompanying drawing to understanding the utility model better the description of the embodiment of the utility model, wherein:
Fig. 1 shows the block diagram according to the led driver circuit of an embodiment of the utility model;
Fig. 2 shows the schematic diagram according to the led driver circuit of an embodiment of the utility model;
Fig. 3 shows the schematic diagram according to the led driver circuit of another embodiment of the utility model; And
Fig. 4 shows the schematic diagram according to the led driver circuit of another embodiment of the utility model.
Embodiment
To describe the characteristic and the exemplary embodiment of the utility model various aspects below in detail.Many details have been contained in following description, so that the complete understanding to the utility model is provided.But, it will be apparent to one skilled in the art that the utility model can implement under the situation of some details in not needing these details.Description in the face of embodiment only is in order to provide the clearer understanding of the utility model through the example that the utility model is shown down.Any concrete configuration that is proposed below the utility model never is limited to, but any modification, replacement and the improvement that under the prerequisite of the spirit that does not break away from the utility model, have covered coherent element or parts.
Fig. 1 shows the block diagram according to the led driver circuit of an embodiment of the utility model.As shown in Figure 1, this led driver circuit comprises that electromagnetic interference (EMI) suppresses circuit 1, bridge rectifier filter circuit 2, high frequency transformer T, switching tube Q1, current detection circuit 3, output rectification circuit 4, sampling feedback circuit 5 and led driver modular integrated circuit (IC) 6.The transmission direction of the line of arrow shown in Fig. 1 representation signal.
In led driver circuit shown in Figure 1, EMI suppresses the front that circuit 1 can be placed on bridge rectifier filter circuit 2, also can be placed on the back of bridge rectifier filter circuit 2, perhaps can adopt the form of PI type filtering directly to connect high frequency transformer T; High frequency transformer T has former limit winding, secondary side winding and three windings of feedback winding; Its limit, Central Plains winding connects bridge rectifier filter circuit 2 or EMI suppresses circuit 1, and secondary side winding connects output rectification circuit 4, and the feedback winding connects bridge rectifier filter circuit 2 through high voltage startup resistance; Give led driver module I C circuit 6 power supplies simultaneously; The feedback winding circuit also connects sampling feedback circuit 5, thereby the input AC electricity is isolated with output DC fully, so does not use optocoupler and optocoupler peripheral circuit in this led driver circuit; Reduce system cost, dwindled the circuit volume; Current detection circuit 3 connects switching tube Q1 and led driver module I C circuit 6, and the electric current of the former limit winding through detecting high frequency transformer T is controlled output rectification circuit 4 output constant currents to the LED lamp.
Fig. 2 shows the schematic diagram according to the led driver circuit of an embodiment of the utility model.As shown in Figure 2, in the present embodiment, the led driver circuit comprises two power inputs (these two power inputs are connected with AC power AC) and a power output end (this power output end output offers the constant current of LED lamp); EMI suppresses circuit 1 one ends and is connected with AC power, and an end connects the input of bridge rectifier filter circuit 2; The output of bridge rectifier filter circuit 2 connects the elementary winding Np of high frequency transformer T; High frequency transformer T comprises three windings: elementary winding Np, secondary winding Ns and feedback winding N
AUXThe end of elementary winding Np connects bridge rectifier filter circuit 2, one ends and connects switching tube Q1; Secondary winding Ns connects output rectification circuit 4 to provide constant current to the LED lamp; Feedback winding N
AUXOne end connects sampling feedback circuit 5 (this sampling feedback circuit is that led driver circuit module IC circuit 6 provides feedback signal) and power supply circuits 7 (these power supply circuits are that led driver circuit module IC circuit 6 provides supply power voltage), other end ground connection; Switching tube Q1 one end connects the elementary winding Np of high frequency transformer T, and an end connects the driving pin of current detection circuit 3 and high-low pressure compensating circuit 8, one ends connection led driver module I C circuit 6; One end of current detection circuit 3 connects switching tube Q1 and high-low pressure compensating circuit 8, one end ground connection.
That is to say, except comprising the circuit shown in Fig. 1, can also comprise the high-low pressure compensating circuit according to the led driver circuit of the utility model embodiment.Wherein, the input of this high-low pressure compensating circuit is connected with the output of power supply circuits, and output is connected with the input of led driver modular integrated circuit and the input of current detection circuit.
In the embodiment shown in Figure 2; EMI suppresses circuit 1 and comprises inductance L 1 and capacitor C X; One end of inductance L 1 connects AC power AC, and the other end connects the input of capacitor C X and bridge rectifier filter circuit 2, and the other end of capacitor C X connects the other end and the bridge rectifier filter circuit 2 of AC power AC.EMI inhibition circuit 1 and bridge rectifier filter circuit 2 also have connected mode II and connection side's formula III except above-mentioned connected mode (being designated as connected mode I).In connected mode II, the input of bridge rectifier filter circuit 2 connects AC power AC through fusing (Fuse) resistance R F, and output connects EMI and suppresses circuit 1, and the output that EMI suppresses circuit 1 connects high frequency transformer T and power supply circuits 7.In connection side's formula III, adopt PI type filtering EMI to suppress circuit, comprise capacitor C X, inductance L 1, capacitor C 1 and inductance L 2; Wherein capacitor C X is connected in parallel on the output of bridge rectifier filter circuit 2; Connect inductance L 1 and inductance L 2 simultaneously, inductance L 1 and the other end of inductance L 2 are connected the two ends of capacitor C 1 respectively, and the input of the high-pressure side connection high frequency transformer T of capacitor C 1 is (if less demanding; Inductance L 2 can be omitted, to reduce system cost).
In the embodiment shown in Figure 2, high frequency transformer T comprises former limit winding (being also referred to as elementary winding) Np, secondary side winding (being also referred to as secondary winding or secondary winding) Ns, feedback winding (being also referred to as auxiliary winding) N
AUXThe model that high frequency transformer T can adopt according to power has EE10, EE13, EFD12.6, EFD15, EE16 etc.Do not adopt in the present embodiment to absorb circuit (RCD snubber), switching tube Q1 need bear certain high pressure stress, and high frequency transformer T adopts different coiling modes can reduce the stress requirement to switching tube.Feedback winding among the high frequency transformer T adopts two parallelly connected coilings; A feedback winding is adjacent with former limit winding, and a feedback winding is adjacent with the secondary winding, can suppress EMI and can reduce the requirement of switching tube stress simultaneously again; Adopt the switching tube of common stress promptly can satisfy, save system cost.
In the embodiment shown in Figure 2, power supply circuits 7 comprise resistance R 1, resistance R 2, diode D1 and capacitor C 2.Resistance R 1 is composed in series high-voltage starting circuit with resistance R 2; High-voltage starting circuit one end connects the output of bridge rectifier filter circuit 2; The other end connects the negative pole of capacitor C 2 and diode D1; The positive pole of diode D1 connects an end of sampling feedback circuit 5, the other end ground connection of capacitor C 2, and the tie point of high-voltage starting circuit, capacitor C 2, diode D1 connects the supply pin of LED driver module IC circuit 6.
In the embodiment shown in Figure 2, sampling feedback circuit 5 comprises resistance R 5 and resistance R 6.The negative pole of the feedback winding of resistance R 5 one ends connection high-frequency electrical depressor T and the diode D1 of power supply circuits 7, the other end connects the feedback pin of resistance R 6 and LED driver module IC circuit 6; One end of resistance R 6 connects the feedback pin of resistance R 5 and led driver module I C circuit 6, an end ground connection.
In the embodiment shown in Figure 2, high-low pressure compensating circuit 8 comprises resistance R 3 and resistance R 4.Resistance R 3 one ends connect the series connection point of the resistance R 1 and the resistance R 2 of power supply circuits 7, and an end connects the current detecting pin and the resistance R 4 of LED driver module IC circuit 6, and the other end of resistance R 4 connects the tie point of switching tube Q1 and current detection circuit 3.
In the embodiment shown in Figure 2, output rectification circuit 4 comprises diode D2 and capacitor C o.The positive pole of diode D2 connects secondary winding Ns one end of high frequency transformer T; The other end of diode D2 and the positive pole that meets load LED after the end of capacitor C o is connected, the other end of capacitor C o connect an end and the negative pole of load LED of the secondary winding Ns of high frequency transformer T.
In the embodiment shown in Figure 2; LED driver module IC circuit 6 is pulse width modulation (PWM) control chip and the necessary peripheral auxiliary element that adopt former limit feedback control technology; Such as the control chip of OB3390 or similar functions, this chip is totally 5 function pin:
Drive pin (BASE): be used for driving switch pipe Q1 (Q1 is two-carrier transistor BJT), Q1 is connected with switching tube;
FEEDBACK CONTROL pin (INV): be used to detect the output voltage of led driver circuit, be connected with sampling feedback circuit 5;
Chip power supply pin (VDD): be used for operating voltage being provided, be connected with power supply circuits 7 to chip;
Current detecting pin (CS): be used to detect the output current of led driver circuit, be connected with current detection circuit 3;
Chip grounding leg (GND): be used for linking to each other with the ground of former limit circuit.
Fig. 3 shows the schematic diagram according to the led driver circuit of another embodiment of the utility model.Compare with schematic diagram shown in Figure 2, increased absorption circuit 9 among Fig. 3 and absorbed circuit 10.
That is to say, except comprising the circuit shown in Fig. 1, can also comprise that two absorb circuit according to the led driver circuit of the utility model embodiment, that is, first absorbs circuit and second absorbs circuit.Wherein, first absorbs circuit (corresponding to absorbing circuit 9) across at the two ends of the elementary winding of high frequency transformer, and second absorbs circuit (corresponding to absorbing circuit 10) across the two ends at the output rectifier spare of output rectification circuit.
In the embodiment shown in fig. 3, absorb circuit 9 and comprise resistance R 7, resistance R 8, capacitor C 3 and diode D3.Four components and parts have two kinds to meet method I and II; Wherein I is that resistance R 7 is connected the output of bridge rectifier filter circuit 2 and elementary winding Np one end of high frequency transformer T with capacitor C 3 parallel connection backs one end; The other end is connected with resistance R 8; The other end of resistance R 8 connects the negative pole of diode D3, the end of the elementary winding Np of the positive pole connection high frequency transformer T of diode D3 and the end of switching tube Q1; II is that resistance R 8 is parallelly connected with resistance R 7 with capacitor C 3 series connection backs; Elementary winding Np one end of one termination high frequency transformer T and the output of bridge rectifier filter 2; The other end connects the negative pole of diode D3, the end of the elementary winding Np of the positive pole connection high frequency transformer T of diode D3 and the end of switching tube Q1.Wherein, resistance R among the scheme I 8 and diode D3 can transpositions, and the resistance R 8 among the scheme II can transposition with capacitor C 3.Absorb the V that circuit is used to absorb switching tube Q1
CELast spike, protection switch pipe Q1 also has certain EMI inhibitory action simultaneously.
In the embodiment shown in fig. 3, absorb circuit 10 and comprise resistance R 9 and capacitor C 10.Resistance R 9 is parallelly connected with diode D2 with capacitor C 10 series connection backs, plays the effect of protection diode D2, also has certain EMI inhibitory action simultaneously.
Fig. 4 shows the schematic diagram according to the led driver circuit of another embodiment of the utility model.Compare with schematic diagram shown in Figure 3, Fig. 4 has increased by streaming circuit of power factor correction 11.
That is to say; According to the led driver circuit of the utility model embodiment except comprising the circuit shown in Fig. 1; Can also comprise that its input is connected with the output of bridge rectifier filter circuit by the streaming circuit of power factor correction, output is connected with the input of power supply circuits.
In the embodiment shown in fig. 4, comprise capacitor C 4, C5, diode D4, D5, D6 and resistance R 11 by streaming circuit of power factor correction 11.The elementary winding Np of the positive voltage terminal of the output of the positive pole connection bridge rectifier filter circuit 2 of capacitor C 4, negative pole, power supply circuits 7 and the high frequency transformer T of diode D6; The other end of capacitor C 4 connects the negative pole of diode D4 and the positive pole of diode D5; The positive pole of diode D4 connects the earth terminal of the output of bridge rectifier filter circuit 2; The negative pole of diode D5 connects resistance R 11; The other end of resistance R 11 connects the positive pole of capacitor C 5 and diode D6, the earth terminal of the output of the other end connection bridge rectifier filter circuit 2 of capacitor C 5 and the positive pole of diode D4.Be to increase the angle of flow of bridge rectifier filter circuit 2 by the principle of streaming circuit of power factor correction raising power factor; At input ac voltage greater than crest voltage one half; Rectifier bridge BD1 just can conducting; Avoid near not control rectifying circuit current spike and current distortion problem that only ability moment conducting causes alternating voltage peak of tradition, improve the power factor (PF value) of system, reduce total harmonic distortion (THD).
In each embodiment according to the utility model, the position that EMI suppresses circuit 1 and bridge rectifier filter circuit 2 can exchange, and shown in the circuit among Fig. 4 12, mainly is the different frequency range of considering to suppress EMI.
In addition, absorption circuit in the utility model 9 is effects of considering EMI, protection switch pipe Q1, diode D2 with absorbing circuit 10, under less demanding condition, also can save in these two circuit one or two to save system cost.
In sum, can be used for the isolated form constant-current LED driver according to the led driver circuit of the embodiment of the utility model, circuit is simple, and system cost is low, and volume is little, is specially adapted to Lamp cup GU10, E27 etc.In addition, the utility model has overcome the defective of prior art and provides a kind of high efficiency, high reliability, full voltage input range and system cost low isolated form constant-current LED driver circuit, and it is simple to have a circuit, and components and parts are few, and volume is little, characteristics such as efficient height.
Below the utility model has been described with reference to the specific embodiment of the utility model; But those skilled in the art all understand; Can carry out various modifications, combination and change to these specific embodiments, and can not break away from the spirit and the scope of the utility model that limits accompanying claims or its equivalent.In addition, it only is exemplary that any signal arrows in the accompanying drawing should be considered to, rather than restrictive, only if concrete indication is arranged in addition.Separate or the ability of combination when not knowing when term is also contemplated as to make, the combination of assembly or step also will be considered to put down in writing.
Claims (10)
1. led driver circuit; Comprise electromagnetic interference suppression circuit, bridge rectifier filter circuit, high frequency transformer, output rectification circuit, switching tube, power supply circuits, sampling feedback circuit, led driver modular integrated circuit and current detection circuit, wherein:
The input of said electromagnetic interference suppression circuit is connected with AC power, and output is connected with the input of said bridge rectifier filter circuit;
The input of said bridge rectifier filter circuit is connected with the output of said electromagnetic interference suppression circuit, and output is connected with the input of the input of said high frequency transformer, said power supply circuits and the input of said led driver modular integrated circuit;
The input of said high frequency transformer is connected with the output of said bridge rectifier filter circuit, and output is connected with the input of the input of said output rectification circuit, said switching tube and the input of said power supply circuits;
The input of said output rectification circuit is connected with the output of said high frequency transformer, and output is connected with LED lamp as load;
The input of said switching tube is connected with the output of the output of said high frequency transformer with said led driver modular integrated circuit, and output is connected with the input of said current detection circuit;
The input of said power supply circuits is connected with the output of the output of said bridge rectifier filter circuit and said high frequency transformer, and output is connected with the input of said sampling feedback circuit and the input of said led driver modular integrated circuit;
The input of said sampling feedback circuit is connected with the output of said power supply circuits, and output is connected with the input of said led driver modular integrated circuit;
The input of said led driver modular integrated circuit is connected with the output of the output of the output of said bridge rectifier filter circuit, said power supply circuits, said sampling feedback circuit and the output of said current detection circuit, and output is connected with said switching tube; And
The input of said current detection circuit is connected with said output end of switching tube, and output is connected with the input of said led driver modular integrated circuit.
2. led driver circuit according to claim 1 is characterized in that, said led driver modular integrated circuit comprises:
The chip power supply pin is used for operating voltage to said led driver modular integrated circuit being provided, and is connected with the output of said power supply circuits;
Drive pin, be used to drive said switching tube, be connected with the input of said switching tube;
The FEEDBACK CONTROL pin is used to detect the output voltage of said led driver circuit, is connected with the output of said sampling feedback circuit;
The current detecting pin is used to detect the output current of said led driver circuit, is connected with said current detection circuit; And
The chip grounding leg is used for ground connection.
3. led driver circuit according to claim 1; It is characterized in that; Also comprise the high-low pressure compensating circuit; The input of wherein said high-low pressure compensating circuit is connected with the output of said power supply circuits, and output is connected with the input of said led driver modular integrated circuit and the input of said current detection circuit.
4. led driver circuit according to claim 1; It is characterized in that; Comprise that also first absorbs the circuit and/or the second absorption circuit; Wherein said first absorbs circuit across at the two ends of the elementary winding of said high frequency transformer, and said second absorbs circuit across the two ends at the output rectifier spare of said output rectification circuit.
5. led driver circuit according to claim 1 is characterized in that, comprises that also its input is connected with the output of said bridge rectifier filter circuit by the streaming circuit of power factor correction, and output is connected with the input of said power supply circuits.
6. led driver circuit; Comprise bridge rectifier filter circuit, electromagnetic interference suppression circuit, high frequency transformer, output rectification circuit, switching tube, power supply circuits, sampling feedback circuit, led driver modular integrated circuit and current detection circuit, wherein:
The input of said bridge rectifier filter circuit is connected with AC power via fusing resistor, and output is connected with the input of said electromagnetic interference suppression circuit;
The input of said electromagnetic interference suppression circuit is connected with the output of said bridge rectifier filter circuit, and output is connected with the input of the input of said high frequency transformer, said power supply circuits and the input of said led driver modular integrated circuit;
The input of said high frequency transformer is connected with the output of said electromagnetic interference suppression circuit, and output is connected with the input of the input of said output rectification circuit, said switching tube and the input of said power supply circuits;
The input of said output rectification circuit is connected with the output of said high frequency transformer, and output is connected with LED lamp as load;
The input of said switching tube is connected with the output of the output of said high frequency transformer with said led driver modular integrated circuit, and output is connected with the input of said current detection circuit;
The input of said power supply circuits is connected with the output of the output of said electromagnetic interference suppression circuit and said high frequency transformer, and output is connected with the input of said sampling feedback circuit and the input of said led driver modular integrated circuit;
The input of said sampling feedback circuit is connected with the output of said power supply circuits, and output is connected with the input of said led driver modular integrated circuit;
The input of said led driver modular integrated circuit is connected with the output of the output of the output of said electromagnetic interference suppression circuit, said power supply circuits, said sampling feedback circuit and the output of said current detection circuit, and output is connected with said switching tube; And
The input of said current detection circuit is connected with said output end of switching tube, and output is connected with the input of said led driver modular integrated circuit.
7. led driver circuit according to claim 6 is characterized in that, said led driver modular integrated circuit comprises:
The chip power supply pin is used for operating voltage to said led driver modular integrated circuit being provided, and is connected with the output of said power supply circuits;
Drive pin, be used to drive said switching tube, be connected with the input of said switching tube;
The FEEDBACK CONTROL pin is used to detect the output voltage of said led driver circuit, is connected with the output of said sampling feedback circuit;
The current detecting pin is used to detect the output current of said led driver circuit, is connected with said current detection circuit; And
The chip grounding leg is used for ground connection.
8. led driver circuit according to claim 6; It is characterized in that; Also comprise the high-low pressure compensating circuit; The input of wherein said high-low pressure compensating circuit is connected with the output of said power supply circuits, and output is connected with the input of said led driver modular integrated circuit and the input of said current detection circuit.
9. led driver circuit according to claim 6; It is characterized in that; Comprise that also first absorbs the circuit and/or the second absorption circuit; Wherein said first absorbs circuit across at the two ends of the elementary winding of said high frequency transformer, and said second absorbs circuit across the two ends at the output rectifier spare of said output rectification circuit.
10. led driver circuit according to claim 6; It is characterized in that; Also comprise by the streaming circuit of power factor correction; Its input is connected with the output of said electromagnetic interference suppression circuit, and output is connected with the input of said power supply circuits, and said electromagnetic interference suppression circuit is a PI type filtering electromagnetic interference suppression circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204532057U CN202310246U (en) | 2011-11-09 | 2011-11-09 | Light-emitting diode (LED) driver circuit |
| TW100224926U TWM429286U (en) | 2011-11-09 | 2011-12-29 | LED driver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204532057U CN202310246U (en) | 2011-11-09 | 2011-11-09 | Light-emitting diode (LED) driver circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202310246U true CN202310246U (en) | 2012-07-04 |
Family
ID=46379052
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204532057U Expired - Lifetime CN202310246U (en) | 2011-11-09 | 2011-11-09 | Light-emitting diode (LED) driver circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202310246U (en) |
| TW (1) | TWM429286U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945655A (en) * | 2012-11-29 | 2013-02-27 | 深圳市华星光电技术有限公司 | Light emitting diode voltage adjusting device and driving system with same |
| WO2014176615A1 (en) * | 2013-05-02 | 2014-11-06 | Tridonic Gmbh & Co Kg | Operating device for luminous elements |
-
2011
- 2011-11-09 CN CN2011204532057U patent/CN202310246U/en not_active Expired - Lifetime
- 2011-12-29 TW TW100224926U patent/TWM429286U/en not_active IP Right Cessation
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102945655A (en) * | 2012-11-29 | 2013-02-27 | 深圳市华星光电技术有限公司 | Light emitting diode voltage adjusting device and driving system with same |
| CN102945655B (en) * | 2012-11-29 | 2015-04-01 | 深圳市华星光电技术有限公司 | Light emitting diode voltage adjusting device and driving system with same |
| WO2014176615A1 (en) * | 2013-05-02 | 2014-11-06 | Tridonic Gmbh & Co Kg | Operating device for luminous elements |
| US9532429B2 (en) | 2013-05-02 | 2016-12-27 | Tridonic Gmbh & Co Kg | Operating device for luminous elements |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM429286U (en) | 2012-05-11 |
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