CN209472806U - A kind of LED lamp decompression of low-voltage DC supply and constant-current drive circuit - Google Patents
A kind of LED lamp decompression of low-voltage DC supply and constant-current drive circuit Download PDFInfo
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- CN209472806U CN209472806U CN201920022480.XU CN201920022480U CN209472806U CN 209472806 U CN209472806 U CN 209472806U CN 201920022480 U CN201920022480 U CN 201920022480U CN 209472806 U CN209472806 U CN 209472806U
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Abstract
A kind of LED lamp decompression of low-voltage DC supply and constant-current drive circuit, are made of DC/DC voltage-dropping power supply circuit 1, LED light string 2 and linear constant current driving circuit 3；Voltage needed for the voltage of by power input anode E1 and power sharing the GND of DC/DC voltage-dropping power supply circuit 1 is converted into stable LED light string 2 and linear constant current driving circuit 3；The operating current of LED light string 2 set by 3 automatic constant of linear constant current driving circuit；The sum of voltage drop when the output voltage of DC/DC voltage-dropping power supply circuit 1 is the minimum initial constant current operation for working normally maximum voltage drop and linear constant current driving circuit 3 of LED light string 2, when ensureing 2 constant current operation of LED light string, linear constant current driving circuit 3 is low in energy consumption, and circuit efficiency is high；Every LED light string 2 is serially connected on linear constant current driving circuit 3 respectively, and every LED light string 2 has ensured the service life of LED light string 2 all in constant current operation state.
Description
Technical field
The present invention relates to the LED lamp driving circuits for one of Landscape Lighting field low-voltage DC supply.
Background technique
At present in LED landscape lighting luminaire circuit system, LED illumination lamp driving circuit is essential link, city
Electricity is converted by power supply, is changed into direct current by exchange and is reduced voltage, can greatly reduce system failure point, reduce LED light
Failure rate improves the safety of system；Since the electrical characteristic of LED lamp bead could ensure lamp using constant-current driving LED lamp bead
The steady working condition of pearl guarantees the long-life of LED lamp bead；Indoor illumination light fitting often uses high pressure 220V power supply driver at present, driving
Device circuit directly converts direct current and constant-current driving LED lamp bead；But for Landscape Lighting, this scheme is endless in all lamps and lanterns
Complete feasible, because there is the lamp power of most Landscape Lighting small, quantity is more, and single loop distribution has control in professional standard
It is more to be such as bound to cause distribution loop by indoor solution execution for the limitation of quantity processed, and wiring and distribution are difficult；So using high-power
Switching Power Supply be depressured at low-voltage direct, then concentrate give LED lamp power supply；Low-voltage DC supply is safer, but crosses low-voltage
The supply current of equal-wattage certainly will increase afterwards, line loss reason will also result in head end lamps and lanterns and tail end lamps and lanterns in route have it is certain
Voltage difference, therefore LED lamp needs driving circuit to ensure the constant current operation of LED lamp bead；LED lamp on market today drives electricity
Road is matched in energy conservation and lamp system has some defects；Now innovate the LED lamp decompression and perseverance of a kind of low-voltage DC supply
Driving circuit is flowed, some defects that current Landscape Lighting applies the LED lamp driving circuit of upper low-voltage DC supply can be solved,
LED lamp is set to have the advantages that energy conservation and system matches, the service life is long, economy is high.
Main innovation point of the present invention:
The LED lamp for researching and developing a kind of low-voltage DC supply is depressured and constant-current drive circuit, cancels landscape lighting luminaire circuit
Balance of voltage resistance, current balancing resistors used in middle usual manner reduce its ohmically power loss, improve constant current essence
Degree improves lamps and lanterns whole efficiency, extends the lamp bead service life, lamps and lanterns fever is reduced, to improve lamps and lanterns reliability.
Summary of the invention
A kind of LED lamp decompression of low-voltage DC supply of the invention and constant-current drive circuit principle are: in lamp power
It is inserted into a DC/DC decompression driving at introducing, is inserted into linear constant current integrated package in every string LED lamp bead；DC/DC is depressured drive control
Its output voltage is homeostasis voltage, and voltage value is that the normal work maximum voltage drop of selected LED light bead string and linear constant current integrate
The sum of voltage drop, in this way minimizes the power consumption of linear constant current integrated package when block minimum initial constant current operation, without being flat
Weighing apparatus circuit and seal in resistance increase reactive loss, simultaneously because the voltage change of power input caused by line loss is to lamps and lanterns
Also it does not have an impact.
The invention has the advantages that LED lamp decompression and the constant current driving electricity of a kind of low-voltage DC supply of the invention
The reactive loss of lamps and lanterns is reduced and energy saving, raising constant current accuracy in road, and circuit is simple and reliable, extends the LED lamp bead service life.
The purpose of the present invention is realized by following technical proposals:
1, a kind of low-voltage DC supply LED lamp decompression and constant-current drive circuit, by DC/DC voltage-dropping power supply circuit 1,
LED light string 2 and linear constant current driving circuit 3 form；DC/DC voltage-dropping power supply circuit 1 is by power input anode E1 and power sharing
Voltage needed for the voltage of ground GND is converted into stable LED light string 2 and linear constant current driving circuit 3；Linear constant current driving circuit 3
The operating current of LED light string 2 set by automatic constant.
2, by a kind of LED lamp decompression of low-voltage DC supply described in upper 1 and constant-current drive circuit, DC/DC decompression
The output voltage of power circuit 1 is that the minimum of the normal work maximum voltage drop and linear constant current driving circuit 3 of LED light string 2 opens
The sum of voltage drop when beginning constant current operation, when ensureing 2 constant current operation of LED light string, linear constant current driving circuit 3 is low in energy consumption, circuit effect
Rate is high.
3, by a kind of LED lamp decompression of low-voltage DC supply described in upper 1 and constant-current drive circuit, every LED light
String 2 is serially connected on linear constant current driving circuit 3 respectively, and every LED light string 2 has ensured LED light all in constant current operation state
The service life of string 2.
The application of the LED lamp driving circuit of common low-voltage DC supply is summarized:
A, a kind of LED lamp driving circuit of low-voltage DC supply is as shown in Fig. 4, there is tetra- lamp string branch electricity of W1-W4
Road is analyzed below with 1 branch W1 of lamp string；There is 1 resistance Rp1 of balance to carry out current limliting in LED light string 2, due to the electricity of LED lamp bead
Pressure and current characteristics, the voltage change of power input E1 can cause the variation of the 1 electric current I1 of branch of LED light string 2, when 1 electricity of balance
Design voltage drop on resistance Rp1 becomes apparent when smaller, therefore the electric current I1 variation that reach LED light string 2 is small, it is desirable that 1 electricity of balance
The design voltage drop hindered on Rp1 is higher, and ohmically invalid loss also increases, and circuit does not have constant current accuracy, and Luminaire efficiency is low.
B, a kind of LED lamp driving circuit of low-voltage DC supply is as shown in Fig. 5, there is tetra- lamp string branch electricity of W1-W4
Road is analyzed below with 1 branch W1 of lamp string；Linear constant current integrated circuit 3 is sealed in LED light string 2, and has Rp1 to carry out power consumption
Balance, the voltage change of power input anode E1 are adjusted by linear constant current integrated circuit 3,1 electric current of branch of LED light string 2
I1's is basically unchanged, balance 1 resistance Rp1 design voltage drop be balance routine AC high pressure turn DC low pressure switching output voltage and
The difference of LED light string 2 plus linear constant current integrated circuit 3 avoids linear constant current driving integrated package U1 fever from transfiniting, therefore circuit constant current
Precision is higher, but balances the efficiency for being lost and reducing integrated circuit that designs on 1 resistance Rp1, and the electricity of power input anode E1
Pressure can cause linear constant current driving integrated package U1 power consumption big and generate heat when being changed to maximum value, the circuit efficiency of this programme is relatively
It is low.
C, a kind of LED lamp driving circuit of low-voltage DC supply is as shown in Fig. 6, and there is switch constant-current circuit 4 to drive
Dynamic LED light string 2,1 branch W1 of only one lamp string；Have in switch constant-current circuit 4 and detect partial pressure A resistance Rf1, in LED light string 2
1 electric current I1 of branch variation when, the upper voltage follow variation of detection partial pressure A resistance Rf1, switch control constant current ic chip 2 is in time
Adjustment output keeps the voltage change of power input anode E1 not cause the variation of 1 electric current I1 of branch of LED light string 2, therefore
1 electric current I1 of the branch variation of LED light string 2 is small, and Luminaire efficiency is high；But for the lamps and lanterns of multiple branch circuit LED light string 2, every paths of LEDs lamp string
2 must be equipped with a switch constant-current drive circuit 4, and for the lamps and lanterns of more lamp strings, switch constant-current drive circuit is more, and circuit design is multiple
It is miscellaneous, interference is also easily caused between each switch constant-current drive circuit, because conventional low voltage direct current supply voltage is DC24V, often at present
It is 3.3V with the voltage drop of white light LEDs, therefore common at most every string LED lamp bead is 6, and conventional large-power LED light bead 3W is selected,
Every string is at most also 18W, then the lamps and lanterns of bigger power must be made of multi-string LED lamp bead, and landscape lighting luminaire many is answered
With being to require lamp bead quantity more and the control mostly every cluster of lamps, ornamental pearl quantity of number of segment generates the visual effect of high-quality less, therefore use
Switch 4 quantity of constant-current drive circuit is more when this programme, and circuit is increasingly complex.
D, a kind of LED lamp driving circuit of low-voltage DC supply is as shown in Fig. 7, and there is switch constant-current circuit 4 to drive
Dynamic LED light string 2；A resistance Rf1 is divided with detection, there is 2 branch W2 of 1 branch W1 of lamp string and lamp string, two paths of LED lamp string 2 is simultaneously
Join, when the electric current I1+I2 on two branches W1, W2 changes, voltage follow variation on detection partial pressure A resistance Rf1, switch DC constant current
Control integrated package IC2 adjusts output in time, and the voltage change of holding power input anode E1 will not cause two of LED light string 2
The variation of branch current I1+I2, therefore the variation of the total current of LED light string 2 is small, Luminaire efficiency is high；But after 2 parallel connection of two paths of LED lamp string
It is equipped with a switch constant-current drive circuit, since the parameter of every paths of LEDs lamp string 2 cannot be completely the same, electric current distribution is not necessarily equal
It weighs, the situation for having light and shade different between lamp string；When 2 open-circuit fault of LED light string all the way, constant current I1+I2 is added in another way entirely
On, cause another way LED light string 2 to overload and be quickly damaged.
The pros and cons of the LED drive circuit application of above-mentioned four kinds of common low-voltage DC supplies:
1) A scheme is protected without constant current, and the increased reactance capacity of resistance is big, and lamps and lanterns easily generate heat, and lamp life is difficult to protect
Card, Luminaire efficiency are low.
2) B scheme, circuit constant current accuracy is higher, and can cause linear constant current integrated when the variation maximum value of power input E1
1 power consumption of circuit U is big and generates heat, and the power consumption for balancing 1 resistance Rp1 is big, and Luminaire efficiency is lower.
3) C scheme, switchs constant current, and Luminaire efficiency is high；But when being used for Landscape Lighting, for the lamps and lanterns of multiple LED light strings 2,
It is more to switch constant-current drive circuit, complex circuit designs respectively also easily cause interference between switch constant-current drive circuit.
4) D scheme, switchs constant current, and Luminaire efficiency is high；But it is connected in parallel on a constant current loop using two string LED light strings 2, respectively
The branch current distribution of paths of LEDs lamp string 2 is not necessarily balanced, the situation for having light and shade different between lamp string；When wherein LED light string all the way
When 2 open-circuit fault, constant current is added in entirely on other 2 circuits of LED light string, and other paths of LEDs lamp strings 2 is caused to overload and damage quickly
It is bad.
In the LED lamp driving circuit application of low-voltage DC supply, the present invention is compared with existing situation:
1) lamp power end increases DC/DC switch voltage-stabilizing circuit, and 2 supply voltage of LED light string of lamps and lanterns is not by line voltage distribution
The influence of variation, circuit efficiency are high.
2) the linear constant-current drive circuit 3 of each LED light string 2,2 constant current accuracy of LED light string are high；Linear constant current driving electricity
Road 3 is few compared to the element of switch constant-current circuit 4, and circuit is simple, and any 2 open-circuit fault of branch LED light string does not influence other
The normal work of paths of LEDs lamp string 2.
3) each lamp string does not have balance resistance, and lamps and lanterns calorific value is few, improves the efficiency of lamps and lanterns LED light string 2.
Detailed description of the invention
Fig. 1: the circuit diagram of case study on implementation one
Fig. 2: the circuit diagram of case study on implementation two
Fig. 3: the circuit diagram of case study on implementation three
Fig. 4: LED lamp circuit theory Fig. 1 of low-voltage DC supply common at present
Fig. 5: LED lamp circuit theory Fig. 2 of low-voltage DC supply common at present
Fig. 6: LED lamp circuit theory Fig. 3 of low-voltage DC supply common at present
Fig. 7: LED lamp circuit theory Fig. 4 of low-voltage DC supply common at present
Explanation: 1.DC/DC voltage-dropping power supply circuit is marked in attached drawing；2.LED lamp string；3. linear constant current driving circuit；4. opening
Close constant-current circuit；E1. power input anode；GND. power sharing；C1. power input filter capacitor；IC1. switch DC/DC drops
Voltage-controlled integrated package processed；Rf1. detection partial pressure A resistance；Rf2. detection partial pressure B resistance；Cf. capacitor is detected；D1. accumulation of energy release is quick
Diode；B1. accumulation of energy inductance；C2. output filter capacitor；E2. constant pressure driving out-put supply anode；W1. 1 branch of lamp string；W2. lamp
Go here and there 2 branches；W3. 3 branch of lamp string；W4. 4 branch of lamp string；I1. 1 electric current of branch；I2. 2 electric current of branch；I3. 3 electric current of branch；I4.
4 electric current of branch；U1. linear constant current drives A integrated package；U2. linear constant current drives B integrated package；U3. linear constant current driving C is integrated
Block；U4. linear constant current drives D integrated package；R1. constant current value sets A resistance；R2. constant current value sets B resistance；R3. constant current value is set
C resistance；R4. constant current value sets D resistance；Rp1. 1 resistance is balanced；Rp2. 2 resistance are balanced；Rp3. 3 resistance are balanced；Rp4. 4 are balanced
Resistance；IC2. current constant control integrated package is switched；P1. switch constant current driving anode；P2. switch constant current drives cathode.
Specific embodiment
Case study on implementation one
Case study on implementation one of the present invention is described in detail in conjunction with Fig. 1:
1, a kind of LED lamp decompression of low-voltage DC supply and constant-current drive circuit, design lamps lighting power are 24W,
The voltage of power supply is DC12V-36V, is made of DC/DC decompression driving 1, LED light string 2 and linear constant current driving circuit 3；
Supply voltage E1 is converted into stable LED light string 2 and linear constant current through HF switch and filtering and driven by DC/DC decompression driving 1
Voltage needed for circuit 3；The constant LED light string 2 of linear constant current driving circuit 3 works required electric current.
2, by a kind of LED lamp decompression of low-voltage DC supply described in upper 1 and constant-current drive circuit, DC/DC decompression is driven
Dynamic 1 is depressured control integrated package IC1, detection partial pressure A resistance Rf1, detection partial pressure B by power input filter capacitor C1, switch DC/DC
Resistance Rf2, detection capacitor Cf, accumulation of energy release fast diode D1, accumulation of energy inductance B1 and output filter capacitor C2 composition；DC/DC
The output voltage of voltage-dropping power supply circuit 1 is the normal work maximum voltage drop and linear constant current driving circuit 3 of LED light string 2
The sum of voltage drop when minimum initial constant current operation, this programme set 10.9V；Power input filter capacitor C1 is 100uf/50V patch
Piece electrolytic capacitor, switch DC/DC decompression control integrated package IC1 select the DC/DC decompression decompression driving of XL1509-ADJ1 integrated
Block, detection partial pressure A resistance Rf1 are the Chip-R of ± 1% precision of 1K resistance value, detection partial pressure B resistance Rf2 is ± 1% patch of 7.96K
Resistance, detection capacitor Cf are 100Pf mica patch capacitor, accumulation of energy release fast diode D1 is MURS340, accumulation of energy inductance B1 is
10x10xH10 closes magnetic core 100uH/3000mA patch type inductance and output filter capacitor C2 is 150uf/35V patch electrolysis electricity
Hold.
3, by a kind of LED lamp decompression of low-voltage DC supply described in upper 1 and constant-current drive circuit, there are four LED light
String branch W1-W4, every lamp string branch routing LED light string 2 and linear constant current driving circuit 3 form；Lamp bead uses the XLamp of Cree
The high-power patch lamp bead of XB-D, every LED light string 2 are composed in series by three lamp beads, and linear constant current driving circuit 3 is by linear constant current
A-D integrated package, that is, U1-U4 and constant current value setting A-D resistance, that is, R1-R4 is driven to form, linear constant current drives A-D integrated package to select
4 pieces of model SM15106T, constant current value set the Chip-R that A-D resistance selects 4 ± 1% precision of 4.02K resistance value；LED is each
Branch current I1 to I4 is set as 352mA.
Case study on implementation two
The present invention is described in further detail in conjunction with Fig. 2:
A kind of LED lamp of the low-voltage DC supply different from scheme one is depressured and constant-current drive circuit, compares scheme one
The difference is that design lamps lighting power is 16W, the voltage of power supply is DC15V-36V, DC/DC voltage-dropping power supply circuit 1
Output voltage E2 is set as 14.2V to GND, and every LED light string 2 is composed in series by four 1W great power LED SMD lamp pearls, inspection
Surveying partial pressure B resistance Rf2 is ± 1% Chip-R of 10.5K, and accumulation of energy inductance B1 is that 10x10xH10 closes magnetic core 82uH/3000mA patch
Chip inductor, each branch current I1 to I4 of LED are set as 352mA.
Case study on implementation three
The present invention is described in further detail in conjunction with Fig. 3:
A kind of LED lamp of the low-voltage DC supply different from scheme one is depressured and constant-current drive circuit, compares scheme one
The difference is that design lamps lighting power is 24W, the voltage of power supply is DC22V-36V, DC/DC voltage-dropping power supply circuit 1
Output voltage E2 is set as 21V to GND, and every LED light string 2 is composed in series by six 1W great power LED SMD lamp pearls, detection
Partial pressure B resistance Rf2 is ± 1% Chip-R of 16.0K, and accumulation of energy inductance B1 is 10x10xH10 pot type magnetic core 68uH/3000mA patch
Inductance；Linear constant current driving circuit 3 is made of linear constant current driving A integrated package U1 and constant current value setting A resistance R1, linear permanent
Stream driving A integrated package selects one piece of model SM15125N, and constant current value sets A resistance and selects a piece of ± 1% precision of 953 Ω resistance value
Chip-R；Linear constant current drives A integrated package SM15125N to have four road constant current outputs, is respectively connected to 1 branch W1 of lamp string, lamp
It goes here and there 2 branch W2,3 branch W3 of lamp string and 4 each branch current I1 to I4 of branch W4, LED of lamp string is 350mA.
Claims (3)
1. a kind of LED lamp of low-voltage DC supply is depressured and constant-current drive circuit, it is characterized in that by DC/DC voltage-dropping power supply circuit
(1), LED light string (2) and linear constant current driving circuit (3) composition；DC/DC voltage-dropping power supply circuit (1) is positive by power input
(E1) voltage needed for power sharing the voltage of GND is converted into stable LED light string (2) and linear constant current driving circuit (3)；
The operating current of LED light string (2) set by linear constant current driving circuit (3) automatic constant.
2. a kind of LED lamp of low-voltage DC supply according to claim 1 is depressured and constant-current drive circuit, feature is also
The output voltage for being DC/DC voltage-dropping power supply circuit (1) is the normal work maximum voltage drop and linear constant current of LED light string (2)
The sum of voltage drop when the minimum initial constant current operation of driving circuit (3), when ensureing LED light string (2) constant current operation, linear constant current is driven
Dynamic circuit (3) are low in energy consumption, and circuit efficiency is high.
3. a kind of LED lamp of low-voltage DC supply according to claim 1 is depressured and constant-current drive circuit, feature is also
The every LED light string (2) being is serially connected in respectively on linear constant current driving circuit (3), and every LED light string (2) is all in perseverance
Working condition is flowed, has ensured the service life of LED light string (2).
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| CN201920022480.XU CN209472806U (en) | 2019-01-08 | 2019-01-08 | A kind of LED lamp decompression of low-voltage DC supply and constant-current drive circuit |
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| CN201920022480.XU CN209472806U (en) | 2019-01-08 | 2019-01-08 | A kind of LED lamp decompression of low-voltage DC supply and constant-current drive circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365388A (en) * | 2021-03-18 | 2021-09-07 | 上海可大光电科技有限公司 | Lamp strip and lamp driven by constant-current power supply |
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2019
- 2019-01-08 CN CN201920022480.XU patent/CN209472806U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113365388A (en) * | 2021-03-18 | 2021-09-07 | 上海可大光电科技有限公司 | Lamp strip and lamp driven by constant-current power supply |
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Address after: 518000 Floor 18, Block B, Building 12, Shenzhen Bay Science and Technology Ecological Park, Nanshan District, Shenzhen City, Guangdong Province Patentee after: Lyad Smart Technology Group Co.,Ltd. Address before: 518063 17F, block B, building 12, Shenzhen Bay science and technology ecological park, No. 18, South Keji Road, Nanshan District, Shenzhen City, Guangdong Province Patentee before: LEYARD LIGHTING CO.,LTD. |
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