CN201331030Y - LED circuit - Google Patents
LED circuit Download PDFInfo
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- CN201331030Y CN201331030Y CNU2009201301458U CN200920130145U CN201331030Y CN 201331030 Y CN201331030 Y CN 201331030Y CN U2009201301458 U CNU2009201301458 U CN U2009201301458U CN 200920130145 U CN200920130145 U CN 200920130145U CN 201331030 Y CN201331030 Y CN 201331030Y
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to a LED circuit, a serial communication port, including resistance-capacitance step-down circuit unit, rectifier circuit unit and the LED circuit unit who establishes ties in proper order and with the parallelly connected filter circuit unit of LED circuit unit, wherein: the LED circuit unit is composed of an LED series branch or at least two parallel LED series branches (2), the LED series branch (2) is composed of LEDs in series or LEDs and a current-limiting resistor in series, and the number X of the LED lamp beads in series meets the following requirements: x is not less than √2U/V, wherein: u is mains voltage, and V is limit forward pulse voltage of the LED when the LED is in limit pulse current. The LED circuit has the advantages of simple structure, low cost, good reliability, high stability and convenience for realizing centralized control.
Description
Technical field
The utility model relates to electronic circuit, relates generally to the LED application circuit, specifically is that a kind of simple in structure, with low cost, good stability, reliability are high, is particluarly suitable for the led circuit of applying in the LED lighting technical field.
Background technology
LED applied technical field in current develop rapidly, LED lighting technical field particularly, no matter be great power LED or middle low power LED, its drive circuit generally all adopts the constant current switch power supply, to guarantee that LED does not shorten and damages because of current overload causes the LED life-span.The LED actuation techniques that adopts the constant current switch power supply is comparative maturity, be used for the constant current switch power supply the IC circuit application also more and more widely.But, because the circuit more complicated of constant current switch power supply, constant current IC circuit having relatively high expectations to working environment, and be operated in the high-frequency impulse state, its stability and reliability are all unlike LED element itself, therefore, the long-life advantage of LED is had a greatly reduced quality in this link of constant current switch power supply, and the fault majority of LED product is because the cause for quality of constant current switch power supply causes at present.Secondly, the load of constant current switch power supply can only be single led series arm, to the led circuit of multiple branch circuit parallel connection, require every branch road all to design independent constant current switch power supply, otherwise, when one or more branch road in the multiple branch circuit led circuit is opened a way, the corresponding increase of electric current meeting of residue branch road forms avalanche effect, and the whole LED circuit can quicken to damage, and adopt a plurality of constant current switch power drives multiple branch circuit led circuits certainly will increase cost, also bring difficulty simultaneously to structural design.
In order to make forward voltage have only LED about 3V to be adapted to the line voltage of all size, except adopting the constant current switch power drives, the many colleagues of industry attempt adopting simple resistance-capacitance depressurization drive circuit to come driving LED.The resistance-capacitance depressurization circuit can drive the LED series circuit of long string, and the LED series circuit operating current of long string is little, can effectively improve circuit reliability and stability, reduces circuit power consumption and cost; Simultaneously, the input ac voltage of control resistance-capacitance depressurization drive circuit can be easy to reach the operating current of effective control LED, so that realize centralized Control such as brightness and switch.But resistance-capacitance depressurization drive circuit itself does not possess voltage stabilizing and constant current function, and simple application is easy to cause LED overvoltage, overcurrent in the LED load and causes the LED lost of life even damage; Secondly, the spike that capacitor charge and discharge is produced when frequent starting of resistance-capacitance depressurization drive circuit also can directly influence the life-span of LED; Moreover single led damage open circuit can cause all the other LED dead electricity " dead lamp cutout " phenomenon to occur in the LED series arm; Also have the power factor (PF) of resistance-capacitance depressurization drive circuit lower.Many technology barriers that above resistance-capacitance depressurization drive circuit exists, directly influence its popularization and application at the LED applied technical field, so that generally acknowledge in LED industry circle and sphere of learning, LED drives and must use constant-current source circuit, it is unprofessional using resistance-capacitance depressurization circuit drives LED, or even infeasible.In fact, the accidental employing resistance-capacitance depressurization that occurs drives on the market led circuit and product are extremely immature, and various technical indicators and quality standard all are difficult to reach industry standard, and LED light decay and dead lamp phenomenon very easily appear in product in use, and the life-span does not guarantee.
The utility model content
The utility model technical issues that need to address are, how to provide a kind of simple in structure, with low cost, good reliability, stability high, be convenient to realize central controlled resistance-capacitance depressurization driving LED circuit, can especially in the LED illuminating product, replace the constant current switch power drives at the LED product, reach effectively and reduce cost, improve the stability and the reliability of LED product, prolong the comprehensive service life of LED product, and obtain the energy conversion efficiency higher than constant current switch power driving circuit.
Technical problem of the present utility model solves like this: make up a kind of led circuit, it is characterized in that, comprise resistance-capacitance depressurization circuit unit, rectification circuit unit and the led circuit unit of series connection successively and the filter circuit unit in parallel with the led circuit unit, wherein: described led circuit unit is made up of a LED series arm or two LED series arms in parallel at least, described LED series arm is composed in series by the LED series connection or by LED and current-limiting resistance, and the LED lamp pearl number X of its series connection satisfies:
In the formula: U is a line voltage, and V is the limit direct impulse voltage of LED when limit pulse current.
According to the led circuit that the utility model provides, described resistance-capacitance depressurization circuit unit is composed in parallel by at least one electric capacity and resistance; Described rectification circuit unit is made up of bridge rectifier; Described filter circuit unit is connected by an electric capacity or two electric capacity form at least; The negative pole end of described led circuit unit is connected respectively with publicly with the negative pole of output end of rectification circuit unit.
Led circuit according to the utility model provides is in series with impedance matching circuit between rectification circuit unit and filter circuit unit.
According to the led circuit that the utility model provides, described impedance matching circuit unit is set up jointly with resistor group by at least one inductance or by at least one inductance.
According to the led circuit that the utility model provides, (one) is in series with the control circuit unit between the negative pole end and public ground of led circuit unit, and described control circuit unit is intelligent switch control circuit, smart brightness control circuit or constant-current control circuit; (2) between the negative pole end and public ground of LED series arm, be in series with the control circuit unit; Described control circuit unit is intelligent switch control circuit, smart brightness control circuit or constant-current control circuit.
The led circuit that provides according to the utility model, single or continuous at least two LED two ends of described LED series arm are in parallel with the combinational circuit of Zener diode or Zener diode, the positive terminal of the combinational circuit of described Zener diode or Zener diode connects the LED negative pole end, and negative pole end connects the LED positive terminal.
The led circuit that the utility model provides, adopt impedance match technique and near-earth intelligence control circuit technology, provide a kind of simple in structure, with low cost, good reliability, stability high, be convenient to realize central controlled resistance-capacitance depressurization driving LED circuit, especially in the LED illuminating product, to replace the constant current switch power drives at the LED product, reach effectively and reduce cost, improve the stability and the reliability of LED product, prolong the comprehensive service life of LED product, and obtain the energy conversion efficiency higher than constant-current drive circuit.The beneficial effect of this scheme more is: the led circuit that a kind of power factor (PF) height, brightness and switch intelligence are controlled, the LED stable working state reliable, the integrated circuit comprehensive life is long is provided, make LED application circuit technology break the technical monopoly of constant current switch power drives, start the LED resistance-capacitance depressurization and drive precedent, be that LED application technology, the particularly penetration and promotion of LED lighting engineering opened up the road of a convenient feasible technology.
Description of drawings
Further the utility model is elaborated below in conjunction with the drawings and specific embodiments.
Fig. 1 is the basic electric theory diagram of the utility model optimal technical scheme;
Fig. 2 is the embodiment circuit theory diagrams of the utility model optimal technical scheme;
The technical scheme circuit theory diagrams that Fig. 3 is composed in parallel by three LED series arms for led circuit described in the utility model;
Fig. 4 is the circuit theory diagrams of a kind of LED lamp device of application the utility model optimal technical scheme;
But the embodiment electricity theory diagram of the centralized Control brightness that Fig. 5 is application the utility model optimal technical scheme to be designed and the LED street lamp illumination system device of switch;
Fig. 6 for use the design of the utility model optimal technical scheme can central controlled LED emergency lighting system device embodiment electricity theory diagram.
The component names of figure notation representative is as follows in the accompanying drawing:
The 1--control circuit
The 2--LED series arm
The specific embodiment
As shown in Figure 1, the utility model circuit comprises resistance-capacitance depressurization circuit unit, rectification circuit unit, filter circuit unit and led circuit unit, LED number by control LED series arm, effectively solve the technical barrier that the spike that capacitor charge and discharge is produced when the circuit frequent starting of resistance-capacitance depressurization driving LED circuit causes the LED lost of life and damage, specifically: the LED series arm is composed in series by the LED series connection or by LED and current-limiting resistance, and the LED lamp pearl number X of its series connection satisfies:
In the formula: U is a line voltage, and V is the limit direct impulse voltage of LED when limit pulse current, further:
Effectively solve the low technical barrier of resistance-capacitance depressurization driving LED circuit power factor by between rectification circuit and filter circuit, being in series with impedance matching circuit;
Effectively solve the technical barrier that resistance-capacitance depressurization driving LED circuit causes the LED over-voltage and over-current easily by the control circuit unit;
By the single of LED series arm or continuous at least two LED two ends and the combinational circuit of Zener diode or the Zener diode connect technical barrier of " extremely lamp stops " of LED that effectively solves in parallel.
Particularly, for the ease of it will be appreciated by those skilled in the art that principle of the present utility model and design feature are described further below in conjunction with accompanying drawing and preferred embodiment.
(1) embodiment 1:
Fig. 2 is the embodiment circuit theory diagrams of the utility model optimal technical scheme.
In Fig. 2, C1 and R1 form the resistance-capacitance depressurization circuit, VD1-4 forms bridge rectifier, L1 forms impedance matching circuit, connect by the voltage-stabiliser tube V1-25 of 75 forward voltage drops white LED lamp VL1-75 that is 2.9-3.3V and 25 11V and to form led circuit, 1 is control circuit, and R2 is a current-limiting resistance, and R3 is a capacitive bypass resistance.
For all technical schemes of the present utility model, the series lamp pearl number of LED series arm needs to determine in accordance with the following methods:
If the number of LED series lamp pearl is X, the line voltage value is U, and the limit direct impulse voltage of LED when limit pulse current is V, and then the crest voltage behind the commercial power rectification is
Because of capacitor C 1 discharges and recharges the peak-peak voltage that causes the spike that is superimposed upon on the LED series arm be
(being equivalent to capacitor C 1 instantaneous short circuit), can get thus:
In the present embodiment, for the 220V civil power, use the white light LEDs of 0.06W, the direct impulse voltage when limit spike electric current 100mA is 5V, and calculating can get, and the number of LED series lamp pearl should be greater than 62, that is:
Consider the mains fluctuation factor, when actual design is used, under the prerequisite that capacitor C 1 design condition allows, increase the LED number of series LED branch road as far as possible.
For all technical schemes of the present utility model, the selection of all components and parts must guarantee in mains fluctuation 10%, and led circuit can normal illumination, in mains fluctuation 20%, and the led circuit fault-free.
Capacitance size and withstand voltage is mainly considered in the selection of capacitor C 1.
The computing formula of capacitor C 1 capacitance is:
C＝I/(2πf?Uc)
Wherein, Uc is the average voltage that is added on the capacitor C 1.The approximate formula of Uc is:
In the above-mentioned formula, I is an operating current, and f is the power supply power frequency, and U is the line voltage value, and L is the induction reactance value of inductance L 1, and R is the resistance of current-limiting resistance, and X is the number of LED series lamp pearl, V
0Rated operational voltage for single pearl LED.
In the present embodiment, I=20mA, f=50Hz, U=220V, L=0.82H, R=240 Ω, X=75, V
0=3V can get as calculated:
C≈1.25uF
The withstand voltage selection of C1 gets final product greater than 250V.
The inductance value of inductance L 1 can determine that L1 can be made up by many inductance series and parallels and satisfy needed induction reactance through experiment.
Filter capacitor C2 selects 105 ° of above high life electrochemical capacitors of big, the withstand voltage 400V of capacitance as far as possible under the prerequisite of product structure space and product cost permission.C1 and C2 can make up by series and parallel and satisfy needed capacitance and withstand voltage.
It is that 0.06W, forward voltage drop are the white light emitting diode of 2.9-3.3V that VL1-75 adopts power.
VS1-25 adopts the Zener diode of 1/2W, 11V, in the time of can damaging open circuit at 3 LEDs in parallel with it, guarantees to have only these 3 LED not work, but all the other LED operate as normal still, and simultaneously, Zener diode also plays eliminates the damaging action of inverse peak voltage to LED.Also can adopt Zener diode and each LED parallel connection of 3.6-3.9V, like this, when single LED damaged, all the other LED are operate as normal still.
Except Evaluation product of the present utility model, the LED product of the employing 220V resistance-capacitance depressurization drive circuit that chance in the market occurs, the number of LED does not all have to surpass 62, thereby the spike when being difficult to eliminate switching on and shutting down is to the fatal damage of LED, and service life is all very short.
(2) embodiment 2:
The technical scheme circuit theory diagrams that Fig. 3 is composed in parallel by three LED series arms 2 for led circuit described in the utility model.Present embodiment is not provided with control circuit, is applicable to the general lighting occasion that replaces incandescent lamp and power saving fluorescent lamp etc. to need not constant luminance.
The present embodiment difference from Example 1 is, only increase by two LED series arms, and correspondingly changed the parameter of C1, L1, C2, the also corresponding increase of the power of entire circuit according to total operating current variation, its complementary characteristic is all similar with embodiment 1, no longer repeats at this.
The weak point of present embodiment is, when the LED of one or more branch road in three LED series arms and Zener diode were opened a way simultaneously, the operating current of all the other branch roads can corresponding increase and shorten its service life.
(3) embodiment 3:
Fig. 4 is the circuit theory diagrams of a kind of LED lamp device of application the utility model optimal technical scheme.Be not difficult to find out from this enforcement illustration,, can obtain the LED lamp of different capacity and brightness the basic circuit parallel connection of a plurality of various technical schemes of the present utility model.
Present embodiment has effectively solved the weak point of embodiment 2, is the comparatively ideal application example of the utility model.
(4) embodiment 4:
But the embodiment electricity theory diagram of the centralized Control brightness that Fig. 5 is application the utility model optimal technical scheme to be designed and the LED street lamp illumination system device of switch.
In this embodiment, " resistance-capacitance depressurization driving LED street lamp " is for using the LED street lamp of the utility model similar embodiment 3 technical schemes design, the brightness of this type of street lamp can change along with the change of input voltage, control the input voltage of all street lamps and just can realize concentrating time switch, regularly brilliance control and concentrated solar energy and wind energy power supply easily, very help the management and the maintenance of street lamp.
In this embodiment; " LED street lamp time-delay becomes light and light-operated switch master controller " can the light harvesting control, time-delay, brilliance control (in fact controlling the input voltage of street lamp), overload protection, fault prompting etc. are all multi-functional in one; and its input power supply can be selected civil power; also can select solar electrical energy generation or wind power generation, very help in remote road lighting, concentrating building and use solar energy and wind power station.
Another advantage of centralized Control LED street lamp is that the LED lamp post structure is simple, good stability, and the reliability height can reduce the set out on a journey worry of maintenance of the fault rate of integral illumination system and minimizing greatly.
(5) embodiment 5:
Fig. 6 for use the design of the utility model optimal technical scheme can central controlled LED emergency lighting system device embodiment electricity theory diagram.
In Fig. 6, utilizing the UPS uninterrupted power source is the resistance-capacitance depressurization driving LED lamp power supply that a series of application the utility model are similar to the design of embodiment 1,2,3 technical schemes, at civil power just often, UPS switching civil power is the power supply of LED lamp, during power failure, UPS directly provides the inversion AC power for LED, realizes emergency lighting.
Concentrate the advantage and the embodiment 4 of emergency lighting system similar, no longer repeat at this.
Claims (9)
1, a kind of led circuit, it is characterized in that, comprise resistance-capacitance depressurization circuit unit, rectification circuit unit and the led circuit unit of series connection successively and the filter circuit unit in parallel with the led circuit unit, wherein: described led circuit unit is made up of a LED series arm or two LED series arms (2) in parallel at least, described LED series arm (2) is composed in series by the LED series connection or by LED and current-limiting resistance, and the LED lamp pearl number X of its series connection satisfies:
In the formula: U is a line voltage, and V is the limit direct impulse voltage of LED when limit pulse current.
According to the described led circuit of claim 1, it is characterized in that 2, described resistance-capacitance depressurization circuit unit is composed in parallel by at least one electric capacity and resistance; Described rectification circuit unit is made up of bridge rectifier; Described filter circuit unit is connected by an electric capacity or two electric capacity form at least; The negative pole end of described led circuit unit is connected respectively with publicly with the negative pole of output end of rectification circuit unit.
3, according to the described led circuit of claim 1, it is characterized in that, between rectification circuit unit and filter circuit unit, be in series with impedance matching circuit.
According to the described led circuit of claim 3, it is characterized in that 4, described impedance matching circuit unit is set up jointly with resistor group by at least one inductance or by at least one inductance.
5, according to claim 1 or 3 described led circuits, it is characterized in that, between the negative pole end and public ground of led circuit unit, be in series with control circuit unit (1), described control circuit unit is intelligent switch control circuit, smart brightness control circuit or constant-current control circuit.
6, the led circuit of resistance-capacitance depressurization driving according to claim 5, it is characterized in that, single or continuous at least two LED two ends of described LED series arm are in parallel with the combinational circuit of Zener diode or Zener diode, the positive terminal of the combinational circuit of described Zener diode or Zener diode connects the LED negative pole end, and negative pole end connects the LED positive terminal.
7, according to claim 1 or 3 described led circuits, it is characterized in that, between the negative pole end and public ground of LED series arm, be in series with the control circuit unit; Described control circuit unit is intelligent switch control circuit, smart brightness control circuit or constant-current control circuit.
8, the led circuit of resistance-capacitance depressurization driving according to claim 6, it is characterized in that, single or continuous at least two LED two ends of described LED series arm are in parallel with the combinational circuit of Zener diode or Zener diode, the positive terminal of the combinational circuit of described Zener diode or Zener diode connects the LED negative pole end, and negative pole end connects the LED positive terminal.
9, according to claim 1 or 3 described led circuits, it is characterized in that, single or continuous at least two LED two ends of described LED series arm are in parallel with the combinational circuit of Zener diode or Zener diode, the positive terminal of the combinational circuit of described Zener diode or Zener diode connects the LED negative pole end, and negative pole end connects the LED positive terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201301458U CN201331030Y (en) | 2009-02-11 | 2009-02-11 | LED circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201301458U CN201331030Y (en) | 2009-02-11 | 2009-02-11 | LED circuit |
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| CN201331030Y true CN201331030Y (en) | 2009-10-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2009201301458U Expired - Lifetime CN201331030Y (en) | 2009-02-11 | 2009-02-11 | LED circuit |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155641A (en) * | 2010-12-07 | 2011-08-17 | 刘昌贵 | Light-emitting diode (LED) fluorescent lamp and connecting circuit thereof |
| CN102818141A (en) * | 2011-06-08 | 2012-12-12 | 启耀光电股份有限公司 | light emitting device |
| CN103250467A (en) * | 2011-12-02 | 2013-08-14 | 叶军 | Led drive circuit and led drive chip |
| CN103607812A (en) * | 2013-11-06 | 2014-02-26 | 广西玖典电子新材料有限公司 | Resistance capacitance step-down driving LED energy saving lamp |
| CN105611687A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | LED circuit |
-
2009
- 2009-02-11 CN CNU2009201301458U patent/CN201331030Y/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155641A (en) * | 2010-12-07 | 2011-08-17 | 刘昌贵 | Light-emitting diode (LED) fluorescent lamp and connecting circuit thereof |
| CN102818141A (en) * | 2011-06-08 | 2012-12-12 | 启耀光电股份有限公司 | light emitting device |
| CN103250467A (en) * | 2011-12-02 | 2013-08-14 | 叶军 | Led drive circuit and led drive chip |
| CN103607812A (en) * | 2013-11-06 | 2014-02-26 | 广西玖典电子新材料有限公司 | Resistance capacitance step-down driving LED energy saving lamp |
| CN105611687A (en) * | 2015-11-24 | 2016-05-25 | 芜湖锐芯电子科技有限公司 | LED circuit |
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| GR01 | Patent grant | ||
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Owner name: SHENZHEN HAOJING LIGHTING TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: DONGGUAN LUNG LIXIANG LIGHTING TECHNOLOGY CO., LTD. Effective date: 20101101 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 523705 2/F, BUILDING H, YILI INDUSTRY CITY, GUANJINGTOU VILLAGE, FENGGANG TOWN, DONGGUAN CITY, GUANGDONG PROVINCE TO: 518116 BUILDING 1, HUAFENG SCIENCE AND TECHNOLOGY PARK, BAOQING ROAD, BAOLONG INDUSTRIAL CITY, LONGGANG DISTRICT, SHENZHEN CITY |
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| TR01 | Transfer of patent right |
Effective date of registration: 20101101 Address after: 518116 Shenzhen Baolong Industrial City Baoqing road Longgang District Huafeng Science & Technology Park 1 Patentee after: Haojing (Shenzhen) Lighting Technology Co., Ltd. Address before: 523705, Guangdong City, Dongguan province Fenggang town head village, perseverance industrial city, H building, two floor Patentee before: Dongguan Lung Lixiang Lighting Technology Co., Ltd. |
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| CX01 | Expiry of patent term |
Granted publication date: 20091021 |
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| CX01 | Expiry of patent term |