CN101858525A - Integral constant-current driving LED fluorescent lamp - Google Patents
Integral constant-current driving LED fluorescent lamp Download PDFInfo
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- CN101858525A CN101858525A CN201010231625A CN201010231625A CN101858525A CN 101858525 A CN101858525 A CN 101858525A CN 201010231625 A CN201010231625 A CN 201010231625A CN 201010231625 A CN201010231625 A CN 201010231625A CN 101858525 A CN101858525 A CN 101858525A
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- constant
- current driving
- diode
- resistor
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Abstract
The invention discloses an integral constant-current driving LED fluorescent lamp, which belongs to the technical field of electronics. The integral constant-current driving LED fluorescent lamp comprises LED lamp strings D1 to Dn, wherein the LED lamp strings D1 to Dn are connected with a constant-current driving circuit which comprises a constant-current driving module U, the VA end of the constant-current driving module U is connected with a resistor R1, is then connected in series with a resistor R2, and is connected to the VB end of the constant-current driving module U, a connecting point of the resistor R1 and the resistor R2 is connected with the IS end of the constant-current driving module 2, a capacitor C3 is connected in parallel with the resistor R2, the VB end of the constant-current driving module U is the output end and is connected with a positive electrode of the LED lamp string D1, D1 to Dn are connected in series, the negative electrode of the Dn is grounded, the VA end of the constant-current driving module U is the input end, is connected with the positive electrode of an electrolytic capacitor C2 and a resistor R4, and is connected with the second end of a rectifier, the first end of the rectifier is connected with a protector F and is connected to one end of an AC power supply, and the third end of the rectifier is connected in parallel with the resistor R3 through the capacitor C1 and is then connected with the other end of the AC power supply. The invention does not need to isolate a transformer, reduces the volume of the whole system, reduces the design cost, and is mainly applied to family illumination and landscape illumination.
Description
Affiliated technical field
The present invention relates to the LED lamp, especially have the LED fluorescent lamp of constant-current driving power supply, belong to electronic technology field.
Background technology
At present,, have negative temperature characteristic again, thereby in application process, need it is carried out steady-working state and protection, thereby produced the notion that drives because LED is the semiconductor devices of characteristic sensitivity.Near harshness, LED can directly connect the electric main of 220V unlike common incandescent lamp bulb to the LED device to the requirement of driving power.LED is 2～3 volts a low voltage drive, must design complicated translation circuit, and the LED lamp of different purposes will be equipped with different power supply adaptors.Existing constant-current driving power supply is split type, needs to use isolating transformer, and the volume of whole system is big, and design cost is higher.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing LED lamp, the invention provides a kind of integral constant-current driving LED fluorescent lamp.
The technical solution adopted for the present invention to solve the technical problems is: integral constant-current driving LED fluorescent lamp comprises LED lamp string D
1-D
n, LED lamp string D
1-D
nBe connected with constant-current drive circuit, this circuit comprises constant-current driven module U; The V of constant-current driven module U
ATerminating resistor R1, connect with resistance R 2 again, to the V of constant-current driven module U
BEnd; Resistance R 1 and the tie point of resistance R 2 connect the IS end of constant-current driven module 2, and capacitor C 3 and resistance R 2 are with in parallel; The V of constant-current driven module U
BEnd and LED lamp string D
1-D
nPositive pole link, to LED lamp string D
1-D
nNegative pole to ground; The V of constant-current driven module U
AEnd connects with the positive pole of electrochemical capacitor C2, and is in parallel with resistance R 4, and in parallel with the negative pole of diode ZD1 series diode ZD3, diode ZD2 series diode ZD4; The tie point of diode ZD1 and diode ZD3 connects the end of protector F to AC power AC; The tie point of diode ZD2 and diode ZD4 is through capacitor C 1, connects the other end of AC power AC after in parallel with resistance R 3.
The invention has the beneficial effects as follows, need not use isolating transformer, dwindled the volume of whole system, reduced design cost.Be mainly used in domestic lighting and Landscape Lighting.
Description of drawings
Fig. 1 is circuit theory diagrams of the present invention.
The specific embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Fig. 1, integral constant-current driving LED fluorescent lamp comprises LED lamp string D
1-D
n, LED lamp string D
1-D
nBe connected with constant-current drive circuit, this circuit comprises constant-current driven module U; The V of constant-current driven module U
ATerminating resistor R1, connect with resistance R 2 again, to the V of constant-current driven module U
BEnd; Resistance R 1 and the tie point of resistance R 2 connect the IS end of constant-current driven module 2, and capacitor C 3 and resistance R 2 are with in parallel; The V of constant-current driven module U
BEnd and LED lamp string D
1-D
nPositive pole link, to LED lamp string D
1-D
nNegative pole to ground; The V of constant-current driven module U
AEnd connects with the positive pole of electrochemical capacitor C2, and is in parallel with resistance R 4, and in parallel with the negative pole of diode ZD1 series diode ZD3, diode ZD2 series diode ZD4; The tie point of diode ZD1 and diode ZD3 connects the end of protector F to AC power AC; The tie point of diode ZD2 and diode ZD4 is through capacitor C 1, connects the other end of AC power AC after in parallel with resistance R 3.
Constant-current driven module U is LC1920, and the applied voltage scope is 5-90V, and output current is that 10-20mA is adjustable.Because higher is withstand voltage, in the application of many lamp series connection, only need a spot of outer member, just can realize exchanging input and use.LC1920 has very high constant current accuracy under operate as normal, in ± 3%.
The selection of R1, R2 resistance:
The output current of LC1920 is to regulate by the R2 in the circuit, and there is a reference source of a 0.6V in portion within it, by IS terminal voltage feedback, reaches the purpose of constant current.If drive the LED of 20mA, the resistance of R2 is so:
R2＝0.6V/20mA＝30Ω
Drive for linear LED, what at first will consider is exactly power problems, and a circuit reasonable in design can make efficient accomplish more than 90%, if but design parameter is not right, will causes chip overheating, and can not normally work, to the application circuit of last figure, suppose that output current is 20mA, V
A-V
BPressure reduction is 70V, if do not consider R1, the loss that consumes so on LC1920 is:
Ploss＝70V×20mA＝1.4W
According to 150 ℃/W of thermal resistance, temperature rise is about 200 ℃ so, adds environment temperature and is higher than maximum 150 ℃ of the junction temperatures that allow far away.Share resistance R 1 so added a power consumption in design, the reasonable distribution by power consumption can make the chip trouble free service.
According to the power consumption that R1=5.1K calculates, the LC1920 maximum power dissipation is about 0.5W, and temperature rise is 75 degree, even be under the condition of 70 degree in environment temperature so, and also can trouble free service.The maximum loss of R1 can reach 1.6W, so select the power resistor of 2W.
The selection of C1 electric capacity:
C1 in the circuit, the effect of R3 mainly is in order to reduce the voltage after the rectification, to make LC1920 be operated in a not too high withstand voltage state, can improve whole efficient on the one hand, also making system more stable on the other hand.But C1 can limit the power output of circuit simultaneously, and this has determined this circuit not too to be fit to do powerful drive scheme.For no other reason than that electric capacity has certain impedance exchanging under the input, if reduce impedance, will increase capacitance, the volume of electric capacity and cost all will increase.
In order to improve the efficient of system, it is very important that the selection of C1 just becomes, and according to the quantity of different lamps, select different parameters, big if the C1 value is selected, and will cause LC1920 withstand voltage too high, and efficient is on the low side; Select for a short time, the LC1920 both end voltage is lower than operating voltage 6V, just can't play the effect of constant current.
Because there is fluctuation in line voltage, when being recommended in input 220V in the time of our design, LC1920 two ends pressure reduction is about 30V, can satisfy like this in ± 10% power network fluctuation scope, and system can constant current work.
Component parameters is in the circuit:
C1 (electric capacity of the dacron): 250V, F:600V/0.5A, R3:100K, R4:1M,
C2 (electrochemical capacitor): 22uF/400V, R1:5.1K/2W, R2:30 Ω, C3:220pF.
Claims (1)
1. an integral constant-current driving LED fluorescent lamp comprises LED lamp string (D
1-D
n), it is characterized in that LED lamp string (D
1-D
n) being connected with constant-current drive circuit, this circuit comprises constant-current driven module (U); The V of constant-current driven module (U)
ATerminating resistor (R1), connect with resistance (R2) again, to the V of constant-current driven module (U)
BEnd; The tie point of resistance (R1) and resistance (R2) connects the IS end of constant-current driven module (2), and electric capacity (C3) and resistance (R2) are with in parallel; The V of constant-current driven module (U)
BEnd and LED lamp string (D
1-D
n) positive pole link, to LED lamp string (D
1-D
n) negative pole to ground; The V of constant-current driven module (U)
AEnd connects with the positive pole of electrochemical capacitor (C2), and (R4) is in parallel with resistance, and in parallel with the negative pole of diode (ZD1) series diode (ZD3), diode (ZD2) series diode (ZD4); Diode (ZD1) connects the end of protector (F) to AC power (AC) with the tie point of diode (ZD3); The tie point of diode (ZD2) and diode (ZD4) is through electric capacity (C1), with the other end that meets AC power (AC) after resistance (R3) is in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010231625A CN101858525A (en) | 2010-07-20 | 2010-07-20 | Integral constant-current driving LED fluorescent lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010231625A CN101858525A (en) | 2010-07-20 | 2010-07-20 | Integral constant-current driving LED fluorescent lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101858525A true CN101858525A (en) | 2010-10-13 |
Family
ID=42944589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201010231625A Pending CN101858525A (en) | 2010-07-20 | 2010-07-20 | Integral constant-current driving LED fluorescent lamp |
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|---|---|
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080779A (en) * | 2010-12-03 | 2011-06-01 | 上海嘉塘电子有限公司 | Efficient energy-saving type LED (light emitting diode) straight pipe lamp |
| WO2017015964A1 (en) * | 2015-07-30 | 2017-02-02 | Tridonic Gmbh & Co Kg | Direct ac driving circuit and luminaire |
-
2010
- 2010-07-20 CN CN201010231625A patent/CN101858525A/en active Pending
Non-Patent Citations (1)
| Title |
|---|
| 《集成电路应用》 20100131 戴雪松 采用线性恒流驱动方案发挥小功率LED在照明应用中的优势 34-35页 1 , 2 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102080779A (en) * | 2010-12-03 | 2011-06-01 | 上海嘉塘电子有限公司 | Efficient energy-saving type LED (light emitting diode) straight pipe lamp |
| WO2017015964A1 (en) * | 2015-07-30 | 2017-02-02 | Tridonic Gmbh & Co Kg | Direct ac driving circuit and luminaire |
| EP3329743A4 (en) * | 2015-07-30 | 2018-10-24 | Tridonic GmbH & Co. KG | Direct ac driving circuit and luminaire |
| US10542594B2 (en) | 2015-07-30 | 2020-01-21 | Tridonic Gmbh & Co Kg | Direct AC driving circuit and luminaire |
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Open date: 20101013 |