CN206061222U - A kind of LED linear constant-current driving power supply of twin voltage work - Google Patents
A kind of LED linear constant-current driving power supply of twin voltage work Download PDFInfo
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- CN206061222U CN206061222U CN201621032396.9U CN201621032396U CN206061222U CN 206061222 U CN206061222 U CN 206061222U CN 201621032396 U CN201621032396 U CN 201621032396U CN 206061222 U CN206061222 U CN 206061222U
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- led string
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- led
- resistance
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
Abstract
This utility model provides a kind of LED linear constant-current driving power supply of twin voltage work, for driving the first LED string and the second LED string, including：Signal sample circuit, diode, the first constant-current drive circuit and the second constant-current drive circuit；The anode of the first LED string is connected with the second constant-current drive circuit and signal sample circuit, the negative electrode of the first LED string is connected with the anode of the first constant-current drive circuit and diode, the negative electrode of diode is connected with the anode and the second constant-current drive circuit of the second LED string, the negative electrode of the second LED string is connected with the first constant-current drive circuit, and the first constant-current drive circuit is connected with signal sample circuit；The junction point of the first LED string, the first constant-current drive circuit and signal sample circuit is power input.This utility model makes the first LED string and the second LED connection in series-parallel work, when voltage is larger, makes the first LED string and the second LED string tandem working when voltage is less.
Description
Technical field
This utility model is related to electronic technology field, more particularly, it relates to a kind of LED linear constant current of twin voltage work
Driving power supply.
Background technology
At present linear constant current driving power supply on the market is all the scheme of single-point input, according to 120Vac input voltages or
The individually designed corresponding driving power supply of 220Vac input voltages.Circuit such as Fig. 1 institutes of traditional LED linear constant-current driving power supply
Show, voltages of the line voltage AC after rectifier bridge DB1 rectifications is meeting the conducting voltage higher than LED1-LEDn (LED string)
Sum, after reaching the running voltage of constant-current driven chip U, constant-current driven chip output constant current.The output of LED string
Pout=Uled*Iout, wherein Uled are the voltage of LED string, and Iout is lamp string stream.
In general, cannot be operated in 220Vac as the linear constant current driving power supply of input voltage using 120Vac
Under input environment, otherwise driving chip U can cause to damage because input and output pressure reduction is excessive, and final LED string normally cannot make
With；Using 220Vac as input voltage linear constant current driving power supply because the pressure drop of LED string much larger than 120Vac gauzes it is whole
Pulsating dc voltage after stream, causes in 120Vac input ranges, it is impossible to reach LED string pressure drop, and LED string cannot be normal
Work.
Utility model content
The utility model proposes a kind of LED linear constant-current driving power supply of twin voltage work, higher or lower in voltage
In the case of can drive LED operation.
For this purpose, the utility model proposes technical scheme below：
A kind of LED linear constant-current driving power supply of twin voltage work, for driving the first LED string and the second LED string,
Including：Signal sample circuit, diode, the first constant-current drive circuit and the second constant-current drive circuit；
The anode of the first LED string is connected with the second constant-current drive circuit and signal sample circuit, the moon of the first LED string
Pole is connected with the anode of the first constant-current drive circuit and diode, the anode of the negative electrode of diode and the second LED string and
Second constant-current drive circuit connects, and the negative electrode of the second LED string is connected with the first constant-current drive circuit, the first constant-current drive circuit
It is connected with signal sample circuit；The junction point of the first LED string, the first constant-current drive circuit and signal sample circuit is that power supply is defeated
Enter end；
When the voltage of signal sample circuit output is less than first voltage threshold value, the first LED string and the second LED string are simultaneously
Connection, the first constant-current drive circuit drive the work of the first LED string, the second constant-current drive circuit to drive the work of the second LED string；When
The voltage of signal sample circuit output is more than second voltage threshold value, the first LED string and the series connection of the second LED string, the first constant current
Drive circuit drives the first LED string and the work of the second LED string；The first voltage threshold value is less than the second voltage threshold
Value.
Wherein, the LED linear constant-current driving power supply of the twin voltage work also includes rectification circuit, and the rectification circuit connects
Connect civil power and the power input.
Wherein, the first LED string and the second LED string are including the LED that the LED or multiple of multiple series connection is in parallel.
Wherein, the signal sample circuit includes resistance R4, resistance R5 and electric capacity C1；
The first end of the resistance R4 connects the anode of the first LED string, the second end connection resistance R5 of the resistance R4
First end and electric capacity C1 first end, the second end ground connection of second end of the electric capacity C1 and resistance R5.
Wherein, first constant-current drive circuit includes chip U1, resistance R1 and resistance R2, the model of chip U1
SM2095E；
The first end at second end, the first end of electric capacity C1 and resistance R5 of the DIM ports connection resistance R4 of the chip U1,
The REXT1 ports of chip U1 connect the first end of resistance R2, and the REXT2 ports of chip U1 connect the first end of resistance R1, chip
The OUT2 ports of U1 connect the negative electrode of the second LED string, and the OUT1 ports of chip U1 connect negative electrode and two poles of the first LED string
The anode of pipe, the second end ground connection of the GND ports of chip U1, second end of resistance R1 and resistance R2.
Wherein, second constant-current drive circuit includes chip U2 and resistance R3, model SM2082D of chip U2；
The OUT terminal mouth of chip U2 connects the anode of the first LED string, and the GND ports of chip U2 connect the first of resistance R3
End and the anode of the second LED string, the negative electrode of the second end connection diode of resistance R3 and the REXT ports of chip U2.
Wherein, when the voltage of signal sample circuit output is less than first voltage threshold value, chip U1 work, diode are turned off,
First LED string carries out current constant control, OUT terminal of the second LED string through chip U2 through the OUT1 ports that chip U1 is controlled
Mouth carries out current constant control, the first LED string and the second LED connection in series-parallel work；
When the voltage of signal sample circuit output is more than second voltage threshold value, the OUT1 ports of chip U1 quit work, core
The OUT2 port workings of piece U1, diode current flow, the voltage at second end of resistance R3 are built-in higher than the REXT ports of chip U2
Reference voltage, chip U1 cut-offs, the first LED string and the second LED string tandem working, are carried out through the OUT2 ports of chip U1
Current constant control.
The LED linear constant-current driving power supply of twin voltage work of the present utility model, when voltage is less, makes the first LED
String and the second LED connection in series-parallel work, when voltage is larger, make the first LED string and the second LED string tandem working.
Description of the drawings
Fig. 1 is the circuit diagram of the LED linear constant-current driving power supply of prior art.
Fig. 2 is a kind of block diagram of the LED linear constant-current driving power supply of twin voltage work that this utility model is provided.
Fig. 3 is the LED linear constant-current drive circuit figure of the twin voltage work that this utility model is provided.
Specific embodiment
It is to make the purpose of this utility model, technical scheme and advantage clearer, new to this practicality below in conjunction with accompanying drawing
Type embodiment is described in further detail.
As shown in Fig. 2 a kind of LED linear constant-current driving power supply of twin voltage work, for driving the first LED string 101
With the second LED string 102, including：Signal sample circuit 104, diode 103, the first constant-current drive circuit 105 and the second constant current
Drive circuit 106.
The anode of the first LED string 101 is connected with the second constant-current drive circuit 106 and signal sample circuit 104, and first
The negative electrode of LED string 101 is connected with the anode of the first constant-current drive circuit 105 and diode 103, the negative electrode of diode 103
It is connected with the anode and the second constant-current drive circuit 106 of the second LED string 102, the negative electrode and first of the second LED string 102
Constant-current drive circuit 105 connects, and the first constant-current drive circuit 105 is connected with signal sample circuit 104；First LED string 101,
First constant-current drive circuit 105 is power input with the junction point of signal sample circuit 104.
When the voltage of the output of signal sample circuit 104 is less than first voltage threshold value, the first LED string 101 and the second LED
Go here and there 102 in parallel, the first constant-current drive circuit 105 drives the first LED string 101 to work, the second constant-current drive circuit 106 drives the
Two LED strings 102 work；When the voltage of the output of signal sample circuit 104 is more than second voltage threshold value, 101 He of the first LED string
Second LED string 102 is connected, and the first constant-current drive circuit 105 drives the first LED string 101 and the second LED string 102 to work；
The first voltage threshold value is less than the second voltage threshold value.
When running voltage is less, the LED linear constant-current driving power supply of the twin voltage work makes 101 He of the first LED string
Second LED string, 102 parallel operation, when running voltage is larger, the LED linear constant-current driving power supply of twin voltage work makes the
102 tandem working of one LED string 101 and the second LED string.
Optionally, the first LED string 101 and the second LED string 102 including multiple series connection LED or multiple simultaneously
The LED of connection.
Preferably, the LED linear constant-current driving power supply of the twin voltage work also includes rectification circuit, the rectification circuit
Connection civil power and the power input, the electric main to being input into carry out rectification.
In the present embodiment, drive the LED linear of the twin voltage work of the first LED string 101 and the second LED string 102 permanent
As shown in figure 3, wherein, DB2 is rectification circuit to stream drive circuit, and the civil power to being input into carries out rectification；Resistance R4, resistance R5 and electricity
Hold C1 composition signal sample circuits 104, the signal of telecommunication after rectification is sampled and filter shape；Chip U1, resistance R1 and electricity
Resistance R2 constitutes the first constant-current drive circuit 105, model SM2095E of chip U1；Chip U2 and resistance R3 constitutes the second constant current
Drive circuit 106, model SM2082D of chip U2.
The first end of the resistance R4 connects the anode of the first LED string 101, the second end connection resistance of the resistance R4
The first end of the first end and electric capacity C1 of R5, second end of the electric capacity C1 and the second end ground connection of resistance R5, the chip U1
DIM ports connection resistance R4 the second end, the first end of electric capacity C1 and resistance R5 first end, the REXT1 ports of chip U1
The first end of connection resistance R2, the REXT2 ports of chip U1 connect the first end of resistance R1, the OUT2 ports connection of chip U1 the
The negative electrode of two LED strings 102, the OUT1 ports of chip U1 connect the anode of the negative electrode and diode 103 of the first LED string 101,
The second end ground connection of the GND ports of chip U1, second end of resistance R1 and resistance R2, the OUT terminal mouth of chip U2 connect a LED
The anode of lamp string 101, the first end and the anode of the second LED string 102 of the GND ports connection resistance R3 of chip U2, resistance R3
The second end connection diode 103 negative electrode and chip U2 REXT ports.
In the present embodiment, first voltage threshold value and second voltage threshold value are relevant with chip U1, and first voltage threshold value is equal to core
The open signal magnitude of voltage of piece U1, when the DIM ports input voltage of chip U1 is less than this value, chip U1 normal works, second is electric
Shutdown signal magnitude of voltage of the pressure threshold value equal to chip U1, when the DIM ports input voltage of chip U1 is more than this value, chip U1's
OUT1 ports quit work, the OUT2 ports normal work of chip U1.
The operation principle of the circuit is as follows：
The resistance R4 of signal sample circuit 104, resistance R5 sample to the voltage waveform after rectification, through electric capacity C1,
A low-voltage signal Ua is filtered into, this signal follows electrical network amplitude and changes.
When the LED linear constant-current driving power supply is operated in the line voltage under 120Vac inputs, signal sample circuit 104 is defeated
The voltage Ua for going out is less than first voltage threshold value, and chip U1, chip U2 work, diode 103 are turned off, and the first LED string 101 is passed through
The OUT1 ports of chip U1 carry out current constant control, and current value is configured by the REXT1 ports of chip U1, the first LED string
101 output P1=ILEDA*ULEDA, the second LED string 102 carries out current constant control through the OUT terminal mouth of chip U2, and second
The output P2=I of LED string 102LEDB*ULEDB, wherein LEDA refers to the first LED string, and LEDB refers to the second LED string, first
102 parallel operation of LED string 101 and the second LED string, gross output P3=P1+P2=U1REXT1/R2*ULEDA+U2REXT/
R3*ULEDB, wherein, U1REXT1For the reference voltage of the REXT1 ports of chip U1, U2REXTFor the benchmark of the REXT ports of chip U2
Voltage.
When the LED linear constant-current driving power supply is operated in the line voltage under 220Vac inputs, signal sample circuit 104 is defeated
The voltage for going out is more than second voltage threshold value, and the OUT1 ports of chip U1 quit work, the OUT2 port workings of chip U1, diode
103 conductings, the voltage at second end of the resistance R3 reference voltage built-in higher than the REXT ports of chip U2, chip U1 cut-offs, the
102 tandem working of one LED string 101 and the second LED string, carries out current constant control through the OUT2 ports of chip U1, and electric current is
I4, gross output P4=I4* (ULEDA+ULEDB)。
Generally, U can be madeLEDA=ULEDB, then P3=ULEDA*(U1REXT1/R2+U2REXT/ R3), P4=2ULEDA*
U1REXT2/ R1, wherein, U1REXT2For the reference voltage of the REXT2 ports of chip U1.
The REXT1 ports of chip U1, the reference voltage U1 of REXT2 portsREXT1、U1REXT2And the REXT ports of chip U2
Reference voltage U2REXTFor fixed value, R1, R2, R3 resistance value is adjusted, P3=P4 can be made, so as to realize the linear perseverance of twin voltage
The luminous flux and light efficiency of stream driving power supply output LED is of substantially equal.
The LED linear constant-current driving power supply of twin voltage work of the present utility model, when voltage is less, makes the first LED
String and the second LED connection in series-parallel work, when voltage is larger, make the first LED string and the second LED string tandem working, and
The output of two kinds of working methods is adjustable to equal.
The above, only this utility model preferably specific embodiment, but protection domain of the present utility model is not
This is confined to, any those familiar with the art can be readily occurred in the technical scope that this utility model is disclosed
Change or replacement, should all cover within protection domain of the present utility model.Therefore, protection domain of the present utility model should
It is defined by scope of the claims.
Claims (7)
1. the LED linear constant-current driving power supply that a kind of twin voltage works, for driving the first LED string and the second LED string, its
It is characterised by, including：Signal sample circuit, diode, the first constant-current drive circuit and the second constant-current drive circuit；
The anode of the first LED string is connected with the second constant-current drive circuit and signal sample circuit, the negative electrode of the first LED string with
The anode and second of the anode connection of the first constant-current drive circuit and diode, the negative electrode of diode and the second LED string
Constant-current drive circuit connects, and the negative electrode of the second LED string be connected with the first constant-current drive circuit, the first constant-current drive circuit and believes
The connection of number sample circuit；The junction point of the first LED string, the first constant-current drive circuit and signal sample circuit is power input
End；
When the voltage of signal sample circuit output is less than first voltage threshold value, the first LED string and the second LED connection in series-parallel, the
One constant-current drive circuit drives the work of the first LED string, the second constant-current drive circuit to drive the work of the second LED string；Work as signal
The voltage of sample circuit output is more than second voltage threshold value, the first LED string and the series connection of the second LED string, the first constant-current driving
Drives the first LED string and the work of the second LED string；The first voltage threshold value is less than the second voltage threshold value.
2. the LED linear constant-current driving power supply that twin voltage as claimed in claim 1 works, it is characterised in that also including rectification
Circuit, the rectification circuit connection civil power and the power input.
3. the LED linear constant-current driving power supply that twin voltage as claimed in claim 1 works a, it is characterised in that LED
Lamp string and the second LED string are including the LED that the LED or multiple of multiple series connection is in parallel.
4. the LED linear constant-current driving power supply that twin voltage as claimed in claim 1 works, it is characterised in that the signal is adopted
Sample circuit includes resistance R4, resistance R5 and electric capacity C1；
The first end of the resistance R4 connects the anode of the first LED string, and the of the second end connection resistance R5 of the resistance R4
One end and the first end of electric capacity C1, second end of the electric capacity C1 and the second end ground connection of resistance R5.
5. the LED linear constant-current driving power supply that twin voltage as claimed in claim 4 works, it is characterised in that described first is permanent
Stream drive circuit includes chip U1, resistance R1 and resistance R2, model SM2095E of chip U1；
The first end at second end, the first end of electric capacity C1 and resistance R5 of the DIM ports connection resistance R4 of the chip U1, chip
The REXT1 ports of U1 connect the first end of resistance R2, and the REXT2 ports of chip U1 connect the first end of resistance R1, chip U1's
OUT2 ports connect the negative electrode of the second LED string, and the OUT1 ports of chip U1 connect the negative electrode and diode of the first LED string
Anode, the second end ground connection of the GND ports of chip U1, second end of resistance R1 and resistance R2.
6. the LED linear constant-current driving power supply that twin voltage as claimed in claim 5 works, it is characterised in that described second is permanent
Stream drive circuit includes chip U2 and resistance R3, model SM2082D of chip U2；
The OUT terminal mouth of chip U2 connects the anode of the first LED string, the first end of the GND ports connection resistance R3 of chip U2 and
The anode of the second LED string, the negative electrode of the second end connection diode of resistance R3 and the REXT ports of chip U2.
7. the LED linear constant-current driving power supply that twin voltage as claimed in claim 6 works, it is characterised in that：
When the voltage of signal sample circuit output is less than first voltage threshold value, chip U1 work, diode shut-off, the first LED
Going here and there and current constant control is carried out through the OUT1 ports of chip U1 controls, the second LED string carries out constant current through the OUT terminal mouth of chip U2
Control, the first LED string and the second LED connection in series-parallel work；
When the voltage of signal sample circuit output is more than second voltage threshold value, the OUT1 ports of chip U1 quit work, chip U1
OUT2 port workings, diode current flow, the voltage at second end of the resistance R3 benchmark built-in higher than the REXT ports of chip U2
Voltage, chip U1 cut-offs, the first LED string and the second LED string tandem working, carry out constant current through the OUT2 ports of chip U1
Control.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621032396.9U CN206061222U (en) | 2016-08-31 | 2016-08-31 | A kind of LED linear constant-current driving power supply of twin voltage work |
| PCT/CN2017/070699 WO2018040472A1 (en) | 2016-08-31 | 2017-01-10 | Dual-voltage linear constant-current driving power supply for led |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621032396.9U CN206061222U (en) | 2016-08-31 | 2016-08-31 | A kind of LED linear constant-current driving power supply of twin voltage work |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206061222U true CN206061222U (en) | 2017-03-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621032396.9U Active CN206061222U (en) | 2016-08-31 | 2016-08-31 | A kind of LED linear constant-current driving power supply of twin voltage work |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN206061222U (en) |
| WO (1) | WO2018040472A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846745A (en) * | 2017-10-11 | 2018-03-27 | 杭州士兰微电子股份有限公司 | LED drive circuit and its control method |
| CN108040398A (en) * | 2017-12-28 | 2018-05-15 | 广东晶科电子股份有限公司 | A kind of LED linear constant current illumination module of high reliability |
| CN109561546A (en) * | 2018-12-14 | 2019-04-02 | 普诚创智（成都）科技有限公司 | A kind of linear LED drive circuit of twin voltage |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW201413684A (en) * | 2012-09-17 | 2014-04-01 | Luxul Technology Inc | Full voltage serial and parallel LED lamp |
| CN102905443B (en) * | 2012-10-31 | 2014-12-10 | 上海小糸车灯有限公司 | Linear constant-current and current-sharing LED drive circuit and circuit board structure thereof |
| CN103889111B (en) * | 2014-02-28 | 2016-07-27 | 上海路千电子科技有限公司 | The linear constant current drive circuit of a kind of twin voltage operation and driving method thereof |
| CN205105426U (en) * | 2015-10-20 | 2016-03-23 | 晨辉光宝科技有限公司 | Automatic linear constant current LED drive circuit of full voltage sectional type of switching mode |
-
2016
- 2016-08-31 CN CN201621032396.9U patent/CN206061222U/en active Active
-
2017
- 2017-01-10 WO PCT/CN2017/070699 patent/WO2018040472A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107846745A (en) * | 2017-10-11 | 2018-03-27 | 杭州士兰微电子股份有限公司 | LED drive circuit and its control method |
| CN108040398A (en) * | 2017-12-28 | 2018-05-15 | 广东晶科电子股份有限公司 | A kind of LED linear constant current illumination module of high reliability |
| CN109561546A (en) * | 2018-12-14 | 2019-04-02 | 普诚创智（成都）科技有限公司 | A kind of linear LED drive circuit of twin voltage |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2018040472A1 (en) | 2018-03-08 |
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