CN204362386U - A kind of two-way LED drive circuit - Google Patents
A kind of two-way LED drive circuit Download PDFInfo
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- CN204362386U CN204362386U CN201520031498.8U CN201520031498U CN204362386U CN 204362386 U CN204362386 U CN 204362386U CN 201520031498 U CN201520031498 U CN 201520031498U CN 204362386 U CN204362386 U CN 204362386U
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Abstract
The utility model relates to a kind of two-way LED drive circuit.Solving two-way LED circuit electric current distributes uneven, affect lamp life and adjusting device consumed power is large, the problem that generation heat is large.Two-way LED drive circuit comprises the reduction voltage circuit, current rectifying and wave filtering circuit, the LED lamp circuit that are in turn connected into loop, also include constant-current drive circuit and shunting circuit, between constant-current drive circuit is held with being connected on LED lamp circuit output and power supply, described shunting circuit is connected between LED input and constant-current drive circuit output.The utility model has the advantages that and respectively two paths of LED lamp group electric current is controlled, avoid and cause circuit to distribute uneven problem because two paths of LED lamp group is inconsistent, increased considerably the life-span of whole lamp.The power consumption controlling constant-current drive circuit raises along with input voltage and reduces, and improves power-efficient, reduces heating, add the fail safe of LED lamp.
Description
Technical field
The utility model relates to LED technology field, particularly relates to a kind of two-way LED drive circuit.
Background technology
Along with the quickening of speed and LED spreading speed eliminated by incandescent lamp, by feat of the exterior structure of class incandescent lamp, both met the love knot of missing old times or old friends of people, and met again the lighting energy saving requirement day by day improved, LED silk bulb lamp arises at the historic moment and develops rapidly.But well-known, LED drive power is one of the decisive unit in LED lamp life-span.But the structure of class white heat, limits the size of driving power largely, so the driving power overwhelming majority of LED silk bulb lamp adopts this of resistance-capacitance depressurization to need fuse, decompression capacitor at present.The small size circuit structure of very few four main elements such as rectifier bridge, output filter capacitor.And resistance-capacitance depressurization power supply has the characteristic that output current follows input voltage change.This also just means if input voltage raises, output current also can raise, and especially in two loads situation, the inconsistent electric current caused of two-way load distributes uneven, the operating current of filament load can exceed its rated current easily, and this is by directly and affect life-span of whole lamp significantly.In addition, current household LED trend is miniaturized, and adopt the LED of resistance-capacitance depressurization to there is Switching Power Supply complex structure, cost is high, and the LED being not suitable for high voltage small area analysis drives; The LED of employing linear power supply there is power adjustment pipe and LED strip joins, and Correctional tube power is large, produces large calorimetric, reduces power-efficient, increases light fixture heat dissipation design difficulty.
If application number is 201210127431.5, name is called a kind of Chinese invention application of the LED daylight lamp not having resistance to consume energy, and it adopts capacitance-resistance voltage reduction circuit to be the drive circuit of LED daylight lamp, finds out from its circuit diagram, multiple LED group is parallel with one another, is then connected on after current rectifying and wave filtering circuit.Just there is above-mentioned shortcoming in the structure of this patent: resistance-capacitance depressurization power supply has the characteristic that output current follows input voltage change.If input voltage raises, output current also can raise, and in multichannel loading situation, the inconsistent electric current caused of multichannel loading distributes uneven, the operating current of filament load can exceed its rated current easily, and this is by directly and affect life-span of whole lamp significantly.
Summary of the invention
The utility model mainly solves two-way LED circuit electric current and distributes uneven, affects the problem of lamp life, provides a kind of two-way LED drive circuit of electric current distributed uniform.
Another goal of the invention of the utility model solves existing LED lamp middle regulator consumed power greatly, produces heat large, reduce the problem of power, provides a kind of reduction consumed power, reduce the two-way LED drive circuit of heating.
The utility model solves the technical scheme that its technical problem adopts: a kind of two-way LED drive circuit, comprise the reduction voltage circuit being in turn connected into loop, current rectifying and wave filtering circuit, LED lamp circuit, also include constant-current drive circuit and shunting circuit, between described constant-current drive circuit is held with being connected on LED lamp circuit output and power supply, described LED lamp circuit comprises the first LED group and the second LED group that are in parallel, constant-current drive circuit has first input end, second input, first output, second output, first sampling end, second sampling end, first LED group output connects first input end, second LED group exports two sections and connects the second input, first output and the second output head grounding, first sampling end is by ground connection after connection sampling resistor R5, second sampling end leads to connect and adopts ground connection after resistance R6, described shunting circuit is connected between LED input and constant-current drive circuit output.The utility model adds constant-current drive circuit on two-way LED circuit, this constant-current drive circuit can control two paths of LED lamp group electric current respectively, avoid and cause circuit to distribute uneven problem because two paths of LED lamp group is inconsistent, the operating current of LED group can not exceed its rated current, has directly increased considerably the life-span of whole lamp.Shunting circuit, for controlling constant-current drive circuit power consumption, makes the power consumption of constant-current drive circuit raise along with input voltage and reduce, improves power-efficient, reduce heating, add the fail safe of LED lamp.
As a kind of preferred version of such scheme, described shunting circuit includes input voltage sampling control circuit and output current sampling control circuit, input voltage sampling control circuit is connected between LED lamp circuit input and constant-current drive circuit output, output current sampling control circuit input is connected on input voltage sampling control circuit, and output current sampling control circuit output is connected to constant-current drive circuit output.Input voltage sampling control circuit detects input voltage situation, when input voltage is shunted main circuit current higher than during normal voltage, and reduces the power consumption of constant-current drive circuit.Output current sampling control circuit detects constant-current drive circuit output end current, when output current is excessive, shunts electric current, reduces the power consumption of constant-current drive circuit.
As a kind of preferred version of such scheme, described input voltage sampling control circuit comprises resistance R2, resistance R3, resistance R4, triode Q1, be connected between the input of current rectifying and wave filtering circuit and output after resistance R2 and resistance R4 is in series, triode Q1 base stage is connected between resistance R1 and resistance R2, triode Q1 collector electrode contact resistance R4 one end, the resistance R4 other end is connected on current rectifying and wave filtering circuit input, triode Q1 grounded emitter.When input voltage is normal, triode Q1 base voltage is under conducting required voltage, and triode Q1 ends.When input voltage is higher than normal voltage, triode Q1 conducting, the electric current of constant-current drive circuit is shunted further by this turning circuit, and output current reduces, and constant-current drive circuit power consumption reduces.
As a kind of preferred version of such scheme, described output current sampling control circuit comprises triode Q2 and triode Q3, triode Q2 and triode Q3 collector electrode are connected respectively to triode Q1 collector electrode, triode Q2 and triode Q3 emitter ground connection respectively, triode Q2 base stage is connected between the first sampling end and sampling resistor R5, and triode Q3 base stage is connected between the second sampling end and sampling resistor R6.When electric current on constant-current drive circuit first output rises, pressure drop on the first corresponding sampling resistor is also risen thereupon, when the pressure drop on this sampling resistor reaches the voltage of triode Q2 conducting, triode Q2 conducting, the electric current of constant-current drive circuit first output is shunted further by this turning circuit, output current reduces, and constant-current drive circuit power consumption reduces.
The utility model has the advantages that: on two-way LED circuit, add constant-current drive circuit, respectively two paths of LED lamp group electric current is controlled, avoid and cause circuit to distribute uneven problem because two paths of LED lamp group is inconsistent, the operating current of LED group can not exceed its rated current, has directly increased considerably the life-span of whole lamp.The power consumption controlling constant-current drive circuit raises along with input voltage and reduces, and improves power-efficient, reduces heating, add the fail safe of LED lamp.
Accompanying drawing explanation
Fig. 1 is a kind of structural frames diagram of the present utility model;
Fig. 2 is a kind of electrical block diagram of the present utility model.
1-step-down single channel 2-current rectifying and wave filtering circuit 3-LED circuit for lamp 4-constant current drives single channel 5-shunting circuit 6-input voltage sampling control circuit 7-output current sampling control circuit.
Embodiment
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is further described.
Embodiment:
A kind of two-way LED drive circuit of the present embodiment, as shown in Figure 1, comprise reduction voltage circuit 1, current rectifying and wave filtering circuit 2, LED lamp circuit 3, constant-current drive circuit 4, shunting circuit 5, shunting circuit includes input voltage sampling control circuit 6 and output current sampling control circuit 7.Reduction voltage circuit is connected on power firestreak, reduction voltage circuit is connected on current rectifying and wave filtering circuit, rectification filter circuit output end is connected with LED lamp circuit, and LED lamp circuit is connected with constant-current drive circuit, and constant-current drive circuit is connected with zero-power line through the input of current rectifying and wave filtering circuit.Shunting circuit 5 is connected between LED lamp circuit input and constant-current drive circuit output, wherein input voltage sampling control circuit 6 is connected between LED lamp circuit input and constant-current drive circuit 4 output, output current sampling control circuit 7 input is connected on input voltage sampling control circuit 6, and output current sampling control circuit output is connected to constant-current drive circuit output.
As shown in Figure 2, reduction voltage circuit comprises resistance R1 in parallel and electric capacity C1, and reduction voltage circuit input is also connected with fuse F.Current rectifying and wave filtering circuit is made up of rectifier bridge and filter capacitor C2.LED lamp circuit comprises the first LED group and the second LED group that are in parallel.Constant-current drive circuit has 7 pin first input ends, 5 pin second inputs, 1 pin first output, 3 pin second outputs, 2 pin first sampling ends, 4 pin second sampling ends, first LED group output connects first input end, second LED group exports two sections and connects the second input, first output and the second output head grounding, first sampling end is by ground connection after connection sampling resistor R5, second sampling end leads to connect and adopts ground connection after resistance R6, and namely ground connection connect zero line here.Input voltage sampling control circuit 6 comprises resistance R2, resistance R3, resistance R4, triode Q1, be connected between the input of current rectifying and wave filtering circuit and output after resistance R2 and resistance R4 is in series, triode Q1 base stage is connected between resistance R1 and resistance R2, triode Q1 collector electrode contact resistance R4 one end, the resistance R4 other end is connected on current rectifying and wave filtering circuit input, triode Q1 grounded emitter.Output current sampling control circuit 7 comprises triode Q2 and triode Q3, triode Q2 and triode Q3 collector electrode are connected respectively to triode Q1 collector electrode, triode Q2 and triode Q3 emitter ground connection respectively, triode Q2 base stage is connected between the first sampling end and sampling resistor R5, and triode Q3 base stage is connected between the second sampling end and sampling resistor R6.
Add constant-current drive circuit, this constant-current drive circuit can control two paths of LED lamp group electric current respectively, avoid and cause circuit to distribute uneven problem because two paths of LED lamp group is inconsistent, the operating current of LED group can not exceed its rated current, has directly increased considerably the life-span of whole lamp.The shunting circuit course of work is, when input voltage is normal, triode Q1 base voltage is under conducting required voltage, and triode Q1 ends.When input voltage is higher than normal voltage, triode Q1 conducting, the electric current of constant-current drive circuit is shunted further by this turning circuit.When electric current on constant-current drive circuit first output rises, pressure drop on the first corresponding sampling resistor is also risen thereupon, when the pressure drop on this sampling resistor reaches the voltage of triode Q2 conducting, triode Q2 conducting, the electric current of constant-current drive circuit first output is shunted further by this turning circuit.
Specific embodiment described herein is only to the explanation for example of the present invention's spirit.Those skilled in the art can make various amendment or supplement or adopt similar mode to substitute to described specific embodiment, but can't depart from spirit of the present invention or surmount the scope that appended claims defines.
Although more employ the terms such as step-down single channel, current rectifying and wave filtering circuit, LED lamp circuit, constant current driving single channel herein, do not get rid of the possibility using other term.These terms are used to be only used to describe and explain essence of the present invention more easily; The restriction that they are construed to any one additional is all contrary with spirit of the present invention.
Claims (4)
1. a two-way LED drive circuit, comprise the reduction voltage circuit being in turn connected into loop, current rectifying and wave filtering circuit, LED lamp circuit, it is characterized in that: also include constant-current drive circuit (4) and shunting circuit (5), between described constant-current drive circuit is held with being connected on LED lamp circuit output and power supply, described LED lamp circuit (3) comprises the first LED group and the second LED group that are in parallel, constant-current drive circuit has first input end, second input, first output, second output, first sampling end, second sampling end, first LED group output connects first input end, second LED group exports two sections and connects the second input, first output and the second output head grounding, first sampling end is by ground connection after connection sampling resistor R5, second sampling end leads to connect and adopts ground connection after resistance R6, described shunting circuit is connected between LED input and constant-current drive circuit output.
2. a kind of two-way LED drive circuit according to claim 1, it is characterized in that described shunting circuit (5) includes input voltage sampling control circuit (6) and output current sampling control circuit (7), input voltage sampling control circuit is connected between LED lamp circuit (3) input and constant-current drive circuit (4) output, output current sampling control circuit input is connected on input voltage sampling control circuit, and output current sampling control circuit output is connected to constant-current drive circuit output.
3. a kind of two-way LED drive circuit according to claim 2, it is characterized in that described input voltage sampling control circuit (6) comprises resistance R2, resistance R3, resistance R4, triode Q1, be connected between the input of current rectifying and wave filtering circuit and output after resistance R2 and resistance R4 is in series, triode Q1 base stage is connected between resistance R1 and resistance R2, triode Q1 collector electrode contact resistance R4 one end, the resistance R4 other end is connected on current rectifying and wave filtering circuit input, triode Q1 grounded emitter.
4. a kind of two-way LED drive circuit according to claim 3, it is characterized in that described output current sampling control circuit (7) comprises triode Q2 and triode Q3, triode Q2 and triode Q3 collector electrode are connected respectively to triode Q1 collector electrode, triode Q2 and triode Q3 emitter ground connection respectively, triode Q2 base stage is connected between the first sampling end and sampling resistor R5, and triode Q3 base stage is connected between the second sampling end and sampling resistor R6.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520031498.8U CN204362386U (en) | 2015-01-16 | 2015-01-16 | A kind of two-way LED drive circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520031498.8U CN204362386U (en) | 2015-01-16 | 2015-01-16 | A kind of two-way LED drive circuit |
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| CN204362386U true CN204362386U (en) | 2015-05-27 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111556618A (en) * | 2020-05-28 | 2020-08-18 | 青岛亿联客信息技术有限公司 | Multichannel light modulation lamp and multichannel lighting equipment |
| CN112270819A (en) * | 2020-09-25 | 2021-01-26 | 湖南常德牌水表制造有限公司 | M-Bus input micro-power-consumption wireless output parallel converter |
-
2015
- 2015-01-16 CN CN201520031498.8U patent/CN204362386U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111556618A (en) * | 2020-05-28 | 2020-08-18 | 青岛亿联客信息技术有限公司 | Multichannel light modulation lamp and multichannel lighting equipment |
| CN111556618B (en) * | 2020-05-28 | 2023-10-31 | 青岛亿联客信息技术有限公司 | Multichannel dimming lamp and multichannel lighting equipment |
| CN112270819A (en) * | 2020-09-25 | 2021-01-26 | 湖南常德牌水表制造有限公司 | M-Bus input micro-power-consumption wireless output parallel converter |
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