CN202103886U - LED driver circuit - Google Patents
LED driver circuit Download PDFInfo
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- CN202103886U CN202103886U CN2011200440395U CN201120044039U CN202103886U CN 202103886 U CN202103886 U CN 202103886U CN 2011200440395 U CN2011200440395 U CN 2011200440395U CN 201120044039 U CN201120044039 U CN 201120044039U CN 202103886 U CN202103886 U CN 202103886U
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Abstract
The utility model discloses an LED driver circuit, comprising an electromagnetic interference suppression circuit, a bridge-type rectification filter circuit, a high-frequency transformer, an output rectification circuit, a power supply circuit, a sampling feedback circuit, an LED driver module integrated circuit and a current detection circuit; wherein, the input end of the electromagnetic interference suppression circuit is connected with an AC power supply, and the output end is connected with the input end of the bridge-type rectification filter circuit; the input end of the bridge-type rectification filter circuit is connected with the output end of the electromagnetic interference suppression circuit, and the output end is connected with the input ends of the high-frequency transformer, the power supply circuit and the LED driver module integrated circuit; the input end of the high-frequency transformer is connected with the output end of the bridge type rectification filter circuit, and the output end is connected with the input ends of the output rectification circuit, the power supply circuit and the LED driver module integrated circuit; and the input end of the output rectification circuit is connected with the output end of the high-frequency transformer, and the output end is connected with an LED lamp which is considered 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 an embodiment of utility model comprises electromagnetic interference suppression circuit, bridge rectifier filter circuit, high frequency transformer, output rectification circuit, 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 power supply circuits and the input of led driver modular integrated circuit; 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 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; Led driver modular integrated circuit bipolar transistor (BJT), the output of output and high frequency transformer is connected; And current detection circuit is connected with the input of led driver modular integrated circuit.
Led driver circuit according to another embodiment of the present invention comprises bridge rectifier filter circuit, electromagnetic interference suppression circuit, high frequency transformer, output rectification circuit, 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 power supply circuits and the input of led driver modular integrated circuit; 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 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, high frequency transformer, the output of power supply circuits, the output of sampling feedback circuit and the output of current detection circuit, and output is connected with the output of high frequency transformer; And current detection circuit 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, 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 bridge rectifier filter circuit back, 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 led driver volume; Current detection circuit 3 connects 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 and given 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, this 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 constant current offers the 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, and the output of bridge rectifier filter circuit 2 connects elementary winding (the being also referred to as former limit winding) Np of high frequency transformer T; High frequency transformer T comprises three windings: elementary winding Np, secondary winding (being also referred to as secondary side winding) Ns and feedback winding N
AUXThe end of elementary winding Np connects bridge rectifier filter circuit 2, one ends and connects led driver module I C circuit 6; 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 module I C circuit 6 provides feedback signal) and power supply circuits 7 (these power supply circuits are that led driver module I C circuit 6 provides supply power voltage), other end ground connection; One end of current detection circuit 3 connects led driver module I C circuit 6, one end ground connection.
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 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 the EMI inhibition circuit of PI type filtering to comprise capacitor C X, inductance L 1, capacitor C 1 and inductance L 2.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; The input of the high-pressure side connection high frequency transformer T of capacitor C 1 (if less demanding, thereby inductance L 2 can be omitted the reduction system cost).
In the embodiment shown in Figure 2, high frequency transformer T comprises former limit winding Np, secondary side (secondary winding) Ns and feedback winding (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 need bear certain high pressure stress, and the different coiling modes of high frequency transformer T transformer can reduce the requirement of switching tube stress.The feedback winding adopts two parallelly connected coilings among the high frequency transformer T, and a feedback winding is adjacent with former limit winding, and a feedback winding is adjacent with the secondary winding; Can suppress EMI; Reduce the requirement of switching tube stress simultaneously, 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 feedback winding one end of high frequency transformer T, 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 tie point of resistance R 4 and current detection circuit 3 is connected the E pin of LED driver module IC circuit 6.
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 the end of the secondary winding Ns of high frequency transformer T; The other end of diode D2 is connected with the end of capacitor C o and the positive pole of load LED, the end of the secondary winding Ns of the other end connection high frequency transformer T of capacitor C o and the negative pole of load LED.
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 OB3391 or similar functions, this chip is totally 8 function pin, is respectively:
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 high-low pressure offset current 8;
Two collector electrode pin C of built-in chip type bipolar transistor (BJT): the collector electrode of built-in bipolar transistor is connected with the elementary winding Np of high frequency transformer T;
The emitter pin (E) of built-in chip type bipolar transistor (BJT): with the collocation of current detecting pin, be used to detect the output current of led driver circuit, be connected with high-low pressure compensating circuit 8 with current detection circuit 3; And
Two chip grounding legs (GND): be used for ground connection;
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.
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 an end of LED driver module IC circuit 6; 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 an end of led driver module I C circuit 6.Resistance R 8 and diode D3 can transpositions in scheme I, and resistance R 8 can transposition with capacitor C 3 in scheme II.Absorb the V that circuit is used to absorb switching tube BJT
CELast spike, protection switch pipe BJT 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 C10 series connection back, 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.
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 traditional not control rectifying circuit current spike and current distortion problem that only ability moment conducting causes alternating voltage peak, improve system power factor (PF value), reduce total harmonic distortion (THD).
In each embodiment of the utility model, the position that EMI suppresses circuit 1 and bridge rectifier filter circuit 2 can exchange, and shown in circuit 12, mainly is to suppress EMI to consider.
In the embodiment shown in fig. 3, absorbing circuit 9 is effects of considering EMI, protection built-in switch pipe BJT, diode D2 with absorbing circuit 10, under less demanding condition, also can save in these two circuit one or two, to save system cost.
According to above said, comprise also that according to the led driver circuit of the utility model embodiment high-low pressure compensating circuit, first absorbs circuit and/or second and absorbs circuit referring to figs. 2 to Fig. 4.Wherein, the input of 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.First absorbs circuit across at the two ends of the elementary winding of high frequency transformer, and second absorbs circuit across the two ends at the output rectifier spare of output rectification circuit.
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. a led driver circuit comprises electromagnetic interference suppression circuit, bridge rectifier filter circuit, high frequency transformer, output rectification circuit, 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 power supply circuits and the input of said led driver modular integrated circuit;
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 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; Led driver modular integrated circuit bipolar transistor (BJT), the output of output and said high frequency transformer is connected; And
Said current detection circuit 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 being connected with the output of said power supply circuits to said led driver modular integrated circuit power supply;
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;
The emitter pin of built-in chip type bipolar transistor (BJT) is connected with said current detection circuit;
Two collector electrode pin of built-in chip type bipolar transistor (BJT) are connected with the output of said high frequency transformer; And
Two chip grounding legs are 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. a led driver circuit comprises bridge rectifier filter circuit, electromagnetic interference suppression circuit, high frequency transformer, output rectification circuit, 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 power supply circuits and the input of said led driver modular integrated circuit;
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 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 the output of said electromagnetic interference suppression circuit, said high frequency transformer, said power supply circuits, said sampling feedback circuit and the output of said current detection circuit, and output is connected with the output of said high frequency transformer; And
Said current detection circuit 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 being connected with the output of said power supply circuits to said led driver modular integrated circuit power supply;
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 high-low pressure compensating circuit;
The emitter pin of built-in chip type bipolar transistor is connected with said current detection circuit;
Two collector electrode utmost point pin of built-in chip type bipolar transistor are connected with the elementary winding of said high frequency transformer; And
Two chip grounding legs are 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 |
|---|---|---|---|
| CN2011200440395U CN202103886U (en) | 2011-02-17 | 2011-02-17 | LED driver circuit |
| TW100206250U TWM414050U (en) | 2011-02-17 | 2011-04-08 | LED driver circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200440395U CN202103886U (en) | 2011-02-17 | 2011-02-17 | LED driver circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202103886U true CN202103886U (en) | 2012-01-04 |
Family
ID=45389882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200440395U Expired - Lifetime CN202103886U (en) | 2011-02-17 | 2011-02-17 | LED driver circuit |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN202103886U (en) |
| TW (1) | TWM414050U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517484A (en) * | 2012-06-15 | 2014-01-15 | 深圳市通普科技有限公司 | Spotlight driving circuit and spotlight |
-
2011
- 2011-02-17 CN CN2011200440395U patent/CN202103886U/en not_active Expired - Lifetime
- 2011-04-08 TW TW100206250U patent/TWM414050U/en not_active IP Right Cessation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103517484A (en) * | 2012-06-15 | 2014-01-15 | 深圳市通普科技有限公司 | Spotlight driving circuit and spotlight |
| CN103517484B (en) * | 2012-06-15 | 2016-04-20 | 深圳市通普科技有限公司 | Spotlight drive circuit and shot-light |
Also Published As
| Publication number | Publication date |
|---|---|
| TWM414050U (en) | 2011-10-11 |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120104 |