CN102480824A - Cascading LED driving circuit - Google Patents
Cascading LED driving circuit Download PDFInfo
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- CN102480824A CN102480824A CN2010105650008A CN201010565000A CN102480824A CN 102480824 A CN102480824 A CN 102480824A CN 2010105650008 A CN2010105650008 A CN 2010105650008A CN 201010565000 A CN201010565000 A CN 201010565000A CN 102480824 A CN102480824 A CN 102480824A
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Abstract
The invention relates to a cascading LED driving circuit which can lighten different quantities of the LEDs according to voltage variation. By using the cascading LED driving circuit, efficiency can be improved. The circuit mainly comprises: a power supply module, a plurality of LED modules and a constant current assembly. The each LED module comprises: a constant current bypass circuit and at least one LED. The LED is connected in series between a first terminal and a second terminal of the constant current bypass circuit. The first terminal of the each constant current bypass circuit is connected with the power supply module or a third terminal of a higher-level constant current bypass circuit and is connected in series with the constant current assembly in the circuit. Therefore, different quantities of the LEDs can be lightened according to the different voltages and the energy usage efficiency can be improved.
Description
Technical field
The invention relates to a kind of tandem type LED driving circuit, refer to a kind of light-emitting diode that can light varying number according to change in voltage especially, the tandem type LED driving circuit that can raise the efficiency.
Background technology
See also Fig. 1, Fig. 1 is the sketch map of existing light-emitting diode (LED) drive circuit.For reduction circuit volume and saving cost, part manufacturer utilizes transistor control circuit in specific voltage range conducting, uses the assembly that omits big volume such as transformer and filter capacitor.
Its led drive circuit 10 mainly is after an AC power 12 is carried out rectification with the bridge rectifier 14 that includes a plurality of diodes 141, to form a direct current power supply.In the led drive circuit 10, with the conducting of N type gold oxygen half-power transistor 16 Control current with close, with the electric current of a first transistor 151 restricted passage LED 18, and with time of a transistor seconds 153 Control current conductings.
Wherein, the drain of power transistor 16 connects bridge rectifier 14, and source electrode connects the base stage of the first transistor 151, and gate connects the collection utmost point of the first transistor 151.18 of LED are series between the emitter-base bandgap grading and bridge rectifier 14 of the first transistor 151.Also include between the drain and gate that one first resistance 171 is connected in power transistor 16, the 5th resistance 175 is connected between the base stage and emitter-base bandgap grading of the first transistor 151, and the 6th resistance 176 is connected between the collection utmost point and base stage of the first transistor 151.
According to above-mentioned configuration; When the voltage of bridge rectifier 14 outputs raises by zero gradually; The gate current potential of power transistor 16 is also along with rising; When the potential difference between gate and the source electrode during greater than its starting voltage, power transistor 16 beginning conductings, and the electric current of the 5th resistance 175 of flowing through begins to increase.Flow through the potential difference of the 5th resistance 175 during greater than the starting voltage of the first transistor 151 when electric current, and the first transistor 151 also begins conducting, and the gate voltage of power transistor 16 pulled down to lower current potential and the conducting electric current was diminished this moment.Power transistor 16 conducting electric currents diminish and can make the potential difference of the 5th resistance 175 of flowing through diminish, and cause the conducting degree of the first transistor 151 to diminish, and the drop-down degree of power transistor 16 gate voltage also can diminish.So, the conducting electric current of power transistor 16 increases once again, so pin down the electric current that limits the 5th resistance 175 of flowing through each other, makes it become a fixed value.
When bridge rectifier 14 output voltages increased, the electric current of flow through second resistance 172 and the 3rd resistance 173 also became greatly gradually, made transistor seconds 153 conductings at last and the gate current potential of power transistor 16 is drop-down, caused power transistor 16 to be closed.
When the voltage of bridge rectifier 14 output was descended by high potential gradually, the 3rd resistance 173 electric currents were few by reprieving, and after electric current was flowed through the starting voltage of potential difference less than transistor seconds 153 of the 3rd resistance 173, transistor seconds 153 was closed.And the gate voltage of power transistor 16 improves, and makes power transistor 16 conductings, and LED is provided 18 drive currents once again.At last, the voltage of bridge rectifier 14 outputs is reduced to zero-bit, and entire circuit returns zero current condition and forms a circulation.
Though above-mentioned circuit arrangement can reach the purpose of omitting transformer and filter capacitor, yet, in the waveform of whole voltage; In order to prevent that LED 18 from burning; This circuit can only conducting in very little voltage range, and remaining voltage range circuit is all for closing, and is too low for utilization efficiency of energy.
In order to improve energy use efficiency, open case US 2009/0230883 A1 of United States Patent (USP) discloses a kind of stacking-type led controller, and each led controller in order to drive one or more LED, can be series at a plurality of led controllers between power supply and the earth potential respectively.In the time of can't driving its upper level led controller when a led controller its input voltage subcritical value of detecting, then the bypass of upper level led controller is walked around by a by-pass switch.When input voltage is higher than critical value, then close its by-pass switch, the upper level led controller is started.
Though above-mentioned led controller can improve utilization efficiency of energy, however the circuit too complex, and cost of manufacture is too high.And before voltage do not reach the critical voltage of one-level led controller, its energy still had been wasted.
Summary of the invention
A purpose of the present invention is to provide a kind of tandem type LED driving circuit, refers to a kind of light-emitting diode that can light varying number according to change in voltage especially, the tandem type LED driving circuit that can raise the efficiency.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, and it mainly is to utilize a constant current bypass circuit to connect light-emitting diode, can supply cascade to use.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, and wherein this constant current bypass circuit is to be implemented by a pressurizer.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, and its light-emitting diode can be connected between the input and output of pressurizer, by the input input voltage, and connects the next stage circuit by earth terminal.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, can adjust the sensing resistor value and changes the specified by-pass current value of constant current bypass circuit.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, and a constant current assembly is set in cascade circuit, uses each light-emitting diode of protection.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, and wherein the specified by-pass current value of each constant current bypass circuit is the rated current that is slightly less than the constant current assembly.
Another purpose of the present invention is to provide a kind of tandem type LED driving circuit, its power supply can be unsettled direct current or only need with AC power in addition rectification can use.
For reaching above-mentioned purpose, the present invention provides a kind of tandem type LED driving circuit, comprising: a power module, in order to a direct current voltage and an earth potential to be provided; A plurality of light-emitting diode (LED) modules; Be series between direct voltage and the earth potential; Each light-emitting diode (LED) module includes a constant current bypass circuit and a light-emitting diode respectively; Wherein each constant current bypass circuit includes one first end, one second end and one the 3rd end respectively, and each light-emitting diode is connected between first end and second end of corresponding constant current bypass circuit, and first end of each constant current bypass circuit connects the 3rd end of direct voltage or upper level constant current bypass circuit; And a constant current assembly, be series between these a plurality of light-emitting diode (LED) modules and the power module.
Above-mentioned tandem type LED driving circuit, wherein each constant current bypass circuit includes respectively:
One first end, one second end and one the 3rd end;
One reference voltage source connects said first end and the 3rd end, in order to produce a reference voltage;
One current limliting transistor is connected between said first end and second end, the by-pass current that passes through in order to adjustment;
One error amplifier, its positive input terminal connects reference voltage source, and negative input end connects second end,
The output of said error amplifier connects transistorized gate of current limliting or base stage; And
One sensing resistor connects said second end and the 3rd end.
Above-mentioned tandem type LED driving circuit, wherein each constant current bypass circuit can be implemented with a pressurizer respectively, and wherein the input of each pressurizer, output and earth terminal are respectively first end, second end and the 3rd end of said constant current bypass circuit.
Above-mentioned tandem type LED driving circuit, wherein the constant current bypass circuit can be integrated in the chip.
Above-mentioned tandem type LED driving circuit, wherein the reference voltage source of this constant current bypass circuit, current limliting transistor and error amplifier can be integrated in the chip, and said sensing resistor then is located at chip exterior.
Above-mentioned tandem type LED driving circuit, wherein said sensing resistor are adjustable resistance value or the sensing resistor of changing different resistance values.
Above-mentioned tandem type LED driving circuit is characterized in that, wherein said constant current assembly can be a current regulator diode.
Above-mentioned tandem type LED driving circuit, wherein each light-emitting diode (LED) module can include most light-emitting diodes respectively, is series between first end and second end of corresponding constant current bypass circuit.
Above-mentioned tandem type LED driving circuit comprises that also most light-emitting diodes are series between a said majority light-emitting diode (LED) module and power module.
Above-mentioned tandem type LED driving circuit, wherein said constant current assembly can replace by a current-limiting resistance.
Description of drawings
Fig. 1: the sketch map that is an existing LED driving circuit.
Fig. 2: the circuit diagram that is the preferred embodiment of the present invention.
Fig. 3: the circuit diagram that is light-emitting diode (LED) module preferred embodiment of the present invention.
Fig. 4: the circuit diagram that is another embodiment of the present invention.
Fig. 5: the circuit diagram that is further embodiment of this invention.
Fig. 6: the circuit diagram that is another embodiment of light-emitting diode (LED) module of the present invention.
Embodiment
At first, see also Fig. 2, Fig. 2 is the circuit diagram of the preferred embodiment of the present invention.As shown in the figure, the tandem type LED driving circuit 20 of present embodiment consists predominantly of a power module 22, a plurality of light-emitting diode (LED) module 26 and certain electric current assembly 28.
Wherein, power module 22 mainly in order to a direct current voltage and an earth potential to be provided, can add that a rectification unit 24 provides by an AC power 221.Rectification unit 24 is that the bridge rectifier of forming with diode 241 is preferable.
Each light-emitting diode (LED) module 26 includes a constant current bypass circuit 260 and a light-emitting diode 267 respectively.In each light-emitting diode (LED) module 26, constant current bypass circuit 260 has one first end 261, one second end 263 and one the 3rd end 265, and 267 of light-emitting diodes are connected between first end 261 and second end 263.
The output voltage of direct voltage or upper level light-emitting diode (LED) module 26 connects first end 261 of constant current bypass circuit 260; 265 first ends 261 that connect the constant current bypass circuit 260 of next stage light-emitting diode (LED) module 26 of the 3rd end of constant current bypass circuit 260 form a cascade circuit by a plurality of light-emitting diode (LED) module 26 series connection.
Constant current assembly (current regulative device; CRD) 28 can be connected between power module 22 and a plurality of light-emitting diode (LED) module 26; Or between the light-emitting diode (LED) module 26 of cascade,, prevent that light-emitting diode 267 from burning because of the electric current that passes through is excessive in order to final current-limiting function to be provided.This constant current assembly 28 can current regulator diode (current regulative diode, CRD) enforcement.
See also Fig. 3, Fig. 3 is the circuit diagram of light-emitting diode (LED) module preferred embodiment of the present invention.As shown in the figure, in the present embodiment, constant current bypass circuit 30 includes an error amplifier (error amplifier, EA) 34, one reference voltage source 32, a current limliting transistor 36 and a sensing resistor 38.
Wherein, reference voltage source 32 connects first end 301 and the 3rd end 305 of constant current bypass circuit 30, in order to produce a reference voltage.Current limliting transistor 36 is connected between first end 301 and second end 303, the by-pass current that passes through in order to adjustment.The positive input terminal of error amplifier 34 connects reference voltage source, receives this reference voltage, and negative input end connects second end 303 of constant current bypass circuit 30; The output of error amplifier 34 then connects the gate or the base stage of current limliting transistor 36.Sensing resistor 38 is connected between second end 303 and the 3rd end 305.Light-emitting diode 307 is connected between first end 301 and second end 303.
Suppose that light-emitting diode 307 is desirable component, no current passes through when promptly supplying voltage subcritical voltage.Then according to above-mentioned configuration; When the voltage by 301 inputs of first end is lower than the critical voltage of light-emitting diode 307; Light-emitting diode 307 is for opening circuit; All electric currents flow through the current limliting transistor 36 of constant current bypass circuit 30 form a bypass electric current (bypass current, IP) 311, flow to the next stage light-emitting diode (LED) module through sensing resistor 38 by the 3rd end 305.
Behind the critical voltage of voltage greater than light-emitting diode 307 of first end 301, light-emitting diode 307 beginning conductings form a load current (load current, IL) 313.Because configuration of the present invention when load current 313 increases, will cause by-pass current 311 to reduce.When load current 313 during more than or equal to the specified by-pass current of constant current bypass circuit 30; Load current 313 pressure drop that sensing resistor 38 produced of flowing through will make error amplifier 34 that current limliting transistor 36 is closed fully, and all electric currents flow to the next stage light-emitting diode (LED) module via light-emitting diode 307 and sensing resistor 38 by the 3rd end 305.
In fact, entity light-emitting diode 307 is before supply voltage reaches critical voltage, and promptly beginning has electric current to pass through.Yet under configuration of the present invention, produce as long as have through the load current of light-emitting diode 307 313, the by-pass current 311 through current limliting transistor 36 will reduce, and closes fully up to current limliting transistor 36, so do not have the situation generation that wastes energy.
After the current limliting transistor 36 of pressurizer 30 was closed fully, load current 313 might increase because the voltage of input 301 continues to raise.So for preventing that light-emitting diode 307 from burning, need in drive circuit, be provided with certain electric current assembly (as Fig. 2 28).
Constant current bypass circuit 30 of the present invention can be integrated in the chip, can be beneficial to follow-up relevant utilization.
See also Fig. 4, Fig. 4 is the circuit diagram of another embodiment of the present invention.The structure of the tandem LED driving circuit 40 of present embodiment and embodiment illustrated in fig. 2 roughly the same, only present embodiment is to combine light-emitting diode 427 to implement the function of light-emitting diode (LED) module 42 with pressurizer 420.
Wherein, the input 421 of pressurizer 420 is corresponding to first end of constant current bypass circuit, and the output 423 of pressurizer 420 is corresponding to second end of constant current bypass circuit, 425 the 3rd ends corresponding to the constant current bypass circuit of the earth terminal of pressurizer 420.
Because pressurizer 420 has and the similar circuit structure of constant current bypass circuit of the present invention, so via above-mentioned configuration mode, the effect of the constant current bypass of attainable cost invention.
In addition, in the light-emitting diode (LED) module 42 of the present invention, its pressurizer 420 is that (low dropout regulator is preferable LDO) with low-dropout regulator.
See also Fig. 5, Fig. 5 is the circuit diagram of further embodiment of this invention.The structure of present embodiment and embodiment illustrated in fig. 2 roughly the same; Only in the tandem LED driving circuit 50 of present embodiment, the constant current bypass circuit 521,541,561 of each light-emitting diode (LED) module 52,54,56 can have the specified by-pass current of difference slightly.
The specified by-pass current of supposing constant current bypass circuit 541 is maximum, secondly is constant current bypass circuit 561, constant current bypass circuit 521 minimums.When the direct voltage zero of power module 22 outputs begins to raise; Because the specified by-pass current of constant current bypass circuit 521 is minimum; The load current of light-emitting diode 523 can be closed the current limliting transistor of constant current bypass circuit 521 the earliest fully so flow through, and makes electric current fully through light-emitting diode 523.Comparatively speaking, promptly light-emitting diode 523 is lighted the earliest fully, is light-emitting diode 563 secondly, and 543 of light-emitting diodes are lighted at last fully.
So, via the output voltage of constant current bypass circuit 521,541,561 in each light-emitting diode (LED) module 52,54,56 of proper arrangement, i.e. the order lighted of each light-emitting diode 523,543,563 of may command.
In addition, in the tandem type LED driving circuit 50 of the present invention, a plurality of light-emitting diodes 58 of also can directly connecting.Use this structure, when the direct voltage of power module 22 outputs began to rise by zero, directly the light emitting transistor 58 of series connection will at first be lighted, and the time of lighting simultaneously is also the longest, can use as the central illumination of light fixture.Before direct voltage is higher than the pressure drop that these a plurality of light-emitting diodes 58 are caused; Electric current is to pass through via the current limliting transistor bypass of each light-emitting diode (LED) module 52,54,56 constant current bypass circuit 521,541,561, and each light-emitting diode 523,543,563 will can not lighted.
After the direct voltage of power module 22 output was higher than the pressure drop that these a plurality of light-emitting diodes 48 are caused, the voltage that continues to raise just can be lighted the light-emitting diode 523,563,543 of each light-emitting diode (LED) module 52,56,54 in regular turn.
When the direct voltage of power module 22 outputs reduced to zero by high potential, each light-emitting diode will be according to extinguishing with above-mentioned opposite order.
Seeing also Fig. 6, is the circuit diagram of another embodiment of light-emitting diode (LED) module of the present invention.As shown in the figure, the light-emitting diode (LED) module of present embodiment structure is with embodiment illustrated in fig. 3 roughly the same, precisely because the light-emitting diode (LED) module of present embodiment can be in a plurality of light-emitting diodes 66 of connecting between first end 601 of constant current bypass circuit 60 and second end 603.
The 3rd end 605 same first end 601 or the earth potentials that connect first end, 601, the three ends, 605 connection next stage light-emitting diode (LED) modules of DC power supply or upper level light-emitting diode (LED) module.
The more light-emitting diode 66 owing to connect between first end 601 and second end 603, the cross-pressure that first end, 601 second ends of constant current bypass circuit 60 are 603 also should have the change of correspondence.The cross-pressure that first end 601 of adjustment constant current bypass circuit 60 and second end are 603 can use different reference source 62, or the resistance value of change sensing resistor 64 is reached.
Adjust cross-pressure and the size of specified by-pass current between first end 601 and second end 603 for ease; The present invention can be integrated in reference voltage 62, error amplifier 34 and the current limliting transistor 36 of constant current bypass circuit 60 in the chip, and sensing resistor 64 then is external between second end 603 and the 3rd end 605.
This sensing resistor 64 can be used variable resistor, is beneficial to adjust resistance value, also can when using, look the resistance that demand is changed different resistance values, to reach the effect of circuit requirements.
The foregoing description only is to explain for ease and give an example, though made amendment arbitrarily by the person of ordinary skill in the field, all can not break away from the scope like institute's desire protection in claims.
Claims (10)
1. a tandem type LED driving circuit is characterized in that, comprising:
One power module is in order to provide a direct current voltage and an earth potential;
A plurality of light-emitting diode (LED) modules; Be series between direct voltage and the earth potential; Each light-emitting diode (LED) module includes a constant current bypass circuit and a light-emitting diode respectively; Wherein each constant current bypass circuit includes one first end, one second end and one the 3rd end respectively, and each light-emitting diode is connected between first end and second end of corresponding constant current bypass circuit, and first end of each constant current bypass circuit connects the 3rd end of direct voltage or upper level constant current bypass circuit; And
One constant current assembly is series between said a plurality of light-emitting diode (LED) module and the power module.
2. tandem type LED driving circuit as claimed in claim 1 is characterized in that, wherein each constant current bypass circuit includes respectively:
One first end, one second end and one the 3rd end;
One reference voltage source connects said first end and the 3rd end, in order to produce a reference voltage;
One current limliting transistor is connected between said first end and second end, the by-pass current that passes through in order to adjustment;
One error amplifier, its positive input terminal connects reference voltage source, and negative input end connects second end, and the output of said error amplifier connects transistorized gate of current limliting or base stage; And
One sensing resistor connects said second end and the 3rd end.
3. tandem type LED driving circuit as claimed in claim 2; It is characterized in that; Wherein each constant current bypass circuit can be implemented with a pressurizer respectively, and wherein the input of each pressurizer, output and earth terminal are respectively first end, second end and the 3rd end of said constant current bypass circuit.
4. tandem type LED driving circuit as claimed in claim 2 is characterized in that wherein the constant current bypass circuit can be integrated in the chip.
5. tandem type LED driving circuit as claimed in claim 2 is characterized in that, wherein the reference voltage source of this constant current bypass circuit, current limliting transistor and error amplifier can be integrated in the chip, and said sensing resistor then is located at chip exterior.
6. tandem type LED driving circuit as claimed in claim 5 is characterized in that, wherein said sensing resistor is adjustable resistance value or the sensing resistor of changing different resistance values.
7. tandem type LED driving circuit as claimed in claim 1 is characterized in that, wherein said constant current assembly can be a current regulator diode.
8. tandem type LED driving circuit as claimed in claim 1 is characterized in that, wherein each light-emitting diode (LED) module can include a plurality of light-emitting diodes respectively, is series between first end and second end of corresponding constant current bypass circuit.
9. tandem type LED driving circuit as claimed in claim 1 is characterized in that, comprises that also a plurality of light-emitting diodes are series between said a plurality of light-emitting diode (LED) module and the power module.
10. tandem type LED driving circuit as claimed in claim 1 is characterized in that, wherein said constant current assembly can replace by a current-limiting resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010565000.8A CN102480824B (en) | 2010-11-30 | 2010-11-30 | Cascading LED driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010565000.8A CN102480824B (en) | 2010-11-30 | 2010-11-30 | Cascading LED driving circuit |
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| CN102480824A true CN102480824A (en) | 2012-05-30 |
| CN102480824B CN102480824B (en) | 2014-05-14 |
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| CN102826038A (en) * | 2012-08-30 | 2012-12-19 | 中国人民解放军第四军医大学 | Active automobile headlamp capable of improving visibility in rain and snow |
| CN103118464A (en) * | 2013-02-05 | 2013-05-22 | 元烽 | LED alternating-current sectional driven selector switch circuit |
| WO2014121553A1 (en) * | 2013-02-07 | 2014-08-14 | Wu Huai | Led alternating-current drive device with high-power factor |
| CN105472823A (en) * | 2014-08-18 | 2016-04-06 | 欧司朗有限公司 | Driving circuit for lighting device and lighting device |
| CN107734738A (en) * | 2016-08-10 | 2018-02-23 | 株式会社小糸制作所 | Lighting circuit and lamps apparatus for vehicle |
| CN110120197A (en) * | 2019-04-11 | 2019-08-13 | 深圳天源中芯半导体有限公司 | A kind of application of the manystage cascade connection system and its implementation omitted peripheral resistance capacitance and reduce interference |
| CN110381642A (en) * | 2019-08-07 | 2019-10-25 | 深圳市智童乐慧科技有限公司 | A kind of splicing lamp |
| CN111405710A (en) * | 2020-02-21 | 2020-07-10 | 鹰潭阳光照明有限公司 | Intelligence L ED lamp circuit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102826038A (en) * | 2012-08-30 | 2012-12-19 | 中国人民解放军第四军医大学 | Active automobile headlamp capable of improving visibility in rain and snow |
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| CN103118464A (en) * | 2013-02-05 | 2013-05-22 | 元烽 | LED alternating-current sectional driven selector switch circuit |
| WO2014121553A1 (en) * | 2013-02-07 | 2014-08-14 | Wu Huai | Led alternating-current drive device with high-power factor |
| CN105472823A (en) * | 2014-08-18 | 2016-04-06 | 欧司朗有限公司 | Driving circuit for lighting device and lighting device |
| CN107734738A (en) * | 2016-08-10 | 2018-02-23 | 株式会社小糸制作所 | Lighting circuit and lamps apparatus for vehicle |
| CN110120197A (en) * | 2019-04-11 | 2019-08-13 | 深圳天源中芯半导体有限公司 | A kind of application of the manystage cascade connection system and its implementation omitted peripheral resistance capacitance and reduce interference |
| CN110120197B (en) * | 2019-04-11 | 2024-03-08 | 深圳天源中芯半导体有限公司 | Cascade application system capable of omitting peripheral resistance and capacitance to reduce interference and implementation method thereof |
| CN110381642A (en) * | 2019-08-07 | 2019-10-25 | 深圳市智童乐慧科技有限公司 | A kind of splicing lamp |
| CN111405710A (en) * | 2020-02-21 | 2020-07-10 | 鹰潭阳光照明有限公司 | Intelligence L ED lamp circuit |
| CN111405710B (en) * | 2020-02-21 | 2022-06-21 | 鹰潭阳光照明有限公司 | Intelligent LED lamp circuit |
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| CN102480824B (en) | 2014-05-14 |
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