CN208337943U - A kind of integrated chip driving LED expansion current circuit - Google Patents
A kind of integrated chip driving LED expansion current circuit Download PDFInfo
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- CN208337943U CN208337943U CN201820760884.4U CN201820760884U CN208337943U CN 208337943 U CN208337943 U CN 208337943U CN 201820760884 U CN201820760884 U CN 201820760884U CN 208337943 U CN208337943 U CN 208337943U
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Abstract
The utility model relates to a kind of integrated chip driving LED to expand current circuit, it includes LED light group, driving chip and the expansion stream unit being connected between LED light group and driving chip, and the expansion stream unit 2 is to realize the control of the driving chip of small driving current to the LED light of high current.The utility model can be by adjusting adjusting of the prevention realization of resistance R3 to LED light to earth-current, so that the brightness of LED light is controlled, so that LED can work on rated power, issue maximum brightness on the basis of increasing smaller cost.
Description
Technical field
The utility model relates to field of LED illumination, and in particular to a kind of integrated chip driving LED expansion current circuit.
Background technique
Battery powered LED mainly possesses diversified bright light mode currently on the market, sets off the function of atmosphere by contrast, and
The driving chip of LED is directly connected on LED generally by resistance and realizes the driving to LED, due to cost considerations,
LED can be generally driven using the lesser driving chip of driving current, but the driving current of driving chip is small, will lead to LED
There is no enough brightness, not can enter sos mode, can not accomplish the function of emergency.It needs to adopt to improve the brightness of LED light
With the bigger driving chip of driving current, this will increase cost again.
In view of this, the present inventor is directed to the problem of above-mentioned LED drive circuit, and deeply conceive, and then develops
The utility model out.
Utility model content
The purpose of this utility model is to provide a kind of integrated chip driving LED to expand current circuit, can guarantee that LED is bright
The LED of the driving chip driving high current of small driving current is realized in the case where degree.
In order to achieve the above purposes, the technical solution adopted by the utility model is:
A kind of integrated chip driving LED expansion current circuit comprising LED light lamp group and driving chip U1, the LED light group packet
An at least LED light is included, each LED light is connect by expanding stream unit with a driving port OUT of driving chip U1；The expansion stream is single
Member includes triode Q1, PMOS tube M1, resistance R1, resistance R2 and resistance R3, and the base stage of triode Q1 passes through resistance R3 connection LED
The cathode of lamp, and the anode of LED light connects power vd D；The cathode of the emitter connection LED light of triode Q1, meanwhile, emitter
Also pass through a driving port OUT of resistance R1 connection driving chip U1, the collector of triode Q1 then passes through resistance R2 and connects
The driving port OUT of driving chip U1；The collector of the grid connecting triode Q1 of PMOS tube M1, the source electrode connection of PMOS tube M1
The drain electrode of the base stage of triode Q1, PMOS tube M1 is then grounded.
After adopting the above scheme, the utility model can be realized to LED light over the ground by adjusting the prevention of resistance R3
The adjusting of electric current, so that the brightness of LED light is controlled, so that LED can work in volume on the basis of increasing smaller cost
Determine on power, issue maximum brightness, so that LED light is able to enter sos mode, realizes emergency function.
Detailed description of the invention
Fig. 1 is one circuit diagram of the utility model embodiment；
Fig. 2 is two circuit diagram of the utility model embodiment.
Specific embodiment
The utility model discloses a kind of integrated chip driving LED and expands current circuit comprising LED light group 1, driving chip with
And it is connected to the expansion stream unit 2 between LED light group 1 and driving chip, the driving of the expansion stream unit 2 to realize small driving current
Control of the chip to the LED light of high current.For the technology contents of detailed the utility model, embodiment one will be enumerated below and will be implemented
Example two is described in detail.
Fig. 1 show one circuit diagram of the utility model embodiment, as shown in Figure 1, integrated chip is driven in the embodiment
Dynamic LED expands the expansion stream list that current circuit includes a LED light D1, a driving chip U1 and is connected between LED light and driving chip
Member 2, wherein expanding stream unit 2 includes triode Q1, PMOS tube M1, resistance R1, resistance R2 and resistance R3, the base stage of triode Q1
By the cathode of resistance R3 connection LED light, and the anode of LED light connects power vd D；On the one hand the emitter of triode Q1 connects
On the other hand the cathode of LED light passes through a driving port OUT of resistance R1 connection driving chip U1, the current collection of triode Q1
Pole then passes through the driving port OUT of resistance R2 connection driving chip U1；The collector of the grid connecting triode Q1 of PMOS tube M1,
The base stage of the source electrode connecting triode Q1 of PMOS tube M1, the drain electrode of PMOS tube M1 are then grounded.
The maximum operating currenbt of the driving port OUT of driving chip U1 in the embodiment is 40mA, and LED light is specified
Operating current is significantly larger than 40mA.
The working principle of the expansion current circuit of the present embodiment are as follows: the driving port OUT original state of driving chip U1 is high resistant
The grid of state, PMOS tube M1 is height, and source electrode is not turned on drain electrode.When the driving port OUT of driving chip U1 is low, PMOS
The grid of pipe M1 be it is low, source electrode and drain electrode be connected, so that LED light is worked.Meanwhile the base stage of triode Q1 be it is low, collector and
Emitter conducting need to obtain lesser electric current by resistance by the electric current of the driving port OUT of driving chip U1, to realize
Small current control high current.By adjusting the resistance value of resistance R3, impedance of the VDD to GND is adjusted, it is corresponding big to adjust port OUT
Electric current corresponds to LED luminance when to adjusting fixed PWM series.Again by control PWM series, the bright dark duty of LED is adjusted
Than to control the brightness of lamp, LED light being enable to work on rated power, issuing maximum brightness.
Fig. 2 is the circuit diagram of the utility model embodiment two, as shown in Fig. 2, integrated chip driving LED expands current circuit
Including a LED light group 1, a driving chip U1 and the expansion stream unit being connected between LED light group 1 and driving chip U1, LED light
LED light there are three setting in group, three LED light i.e. the first LED light D11, the D12 of the second LED light, third LED light D13 are passed through respectively
Expand the stream expansion stream of unit 21, second unit 22 by first, third expands stream unit 23 and is connected to driving chip U1.
Wherein, the first expansion stream unit 21 includes triode Q11, PMOS tube M11, resistance R11, resistance R21 and resistance R31,
The base stage of triode Q11 passes through the cathode of the first LED light of resistance R31 connection D11, and the anode of the first LED light D11 connects power supply
VDD；On the one hand the emitter of triode Q11 connects the cathode of the first LED light D11, on the other hand driven by resistance R11 connection
The driving port OUT1 of chip U1, the collector of triode Q11 then pass through the driving port of resistance R21 connection driving chip U1
OUT1；The collector of the grid connecting triode Q1 of PMOS tube M1, the base stage of the source electrode connecting triode Q1 of PMOS tube M1, PMOS
The drain electrode of pipe M1 is then grounded.
Second, which expands stream unit 22, includes triode Q12, PMOS tube M12, resistance R12, resistance R22 and resistance R32, triode
The base stage of Q12 passes through the cathode of the second LED light of resistance R32 connection D12, and the anode of the second LED light D12 connects power vd D；Three
On the one hand the emitter of pole pipe Q12 connects the cathode of the second LED light D12, on the other hand pass through resistance R12 connection driving chip U1
Driving port OUT2, the collector of triode Q1 then passes through the driving port OUT2 of resistance R22 connection driving chip U1；PMOS
The collector of the grid connecting triode Q12 of pipe M12, the base stage of the source electrode connecting triode Q12 of PMOS tube M12, PMOS tube M12
Drain electrode be then grounded.
It includes triode Q13, PMOS tube M13, resistance R13, resistance R23 and resistance R33, triode that third, which expands stream unit 23,
The base stage of Q13 passes through the cathode of resistance R33 connection third LED light D13, and the anode of third LED light D13 connects power vd D；Three
On the one hand the emitter of pole pipe Q13 connects the cathode of third LED light D13, on the other hand pass through resistance R1 connection driving chip U1
A driving port OUT3, the collector of triode Q13 then passes through the driving port of resistance R23 connection driving chip U1
OUT3；The collector of the grid connecting triode Q13 of PMOS tube M13, the base stage of the source electrode connecting triode Q13 of PMOS tube M13,
The drain electrode of PMOS tube M13 is then grounded.
The working principle of the expansion current circuit of the embodiment are as follows: the driving port OUT original state of driving chip U1 is high resistant
The grid of state, PMOS tube M11, M12, M13 is height, and source electrode is not turned on drain electrode.When driving chip U1 driving port OU1,
When OUT2, OUT3 are low, the grid of PMOS tube M11, M12, M13 be it is low, source electrode and D drain electrode are connected, and LED light group is made to work.
Meanwhile the base stage of triode Q11, Q12, Q13 be it is low, collector and emitter conducting, the port OUT1, OUT2 that overdrived,
The electric current of OUT3 need to obtain lesser electric current by resistance, to realize Small current control high current.R61, R60 are adjusted, R62's
Resistance value adjusts impedance of the VDD to GND, adjusts the corresponding high current of port OUT, thus corresponding when adjusting fixed PWM series
LED luminance.By controlling PWM series, adjust the bright dark duty ratio of LED enables LED light group to work to control the brightness of lamp
On rated power, maximum brightness is issued.
The above is only the utility model embodiment, not makees any limit to the technical scope of the utility model
System, thus any trickle amendment made by the above technical examples according to the technical essence of the present invention, equivalent variations with repair
Decorations, are still within the scope of the technical solutions of the present invention.
Claims (1)
1. a kind of integrated chip driving LED expands current circuit, it is characterised in that: described including LED light lamp group and driving chip U1
LED light group includes an at least LED light, and each LED light is connect by expanding stream unit with a driving port OUT of driving chip U1；
The expansion stream unit includes triode Q1, PMOS tube M1, resistance R1, resistance R2 and resistance R3, and the base stage of triode Q1 passes through electricity
The cathode of R3 connection LED light is hindered, and the anode of LED light connects power vd D；The cathode of the emitter connection LED light of triode Q1,
Meanwhile emitter also passes through a driving port OUT of resistance R1 connection driving chip U1, the collector of triode Q1 then passes through
The driving port OUT of resistance R2 connection driving chip U1；The collector of the grid connecting triode Q1 of PMOS tube M1, PMOS tube M1
Source electrode connecting triode Q1 base stage, the drain electrode of PMOS tube M1 is then grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820760884.4U CN208337943U (en) | 2018-05-21 | 2018-05-21 | A kind of integrated chip driving LED expansion current circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820760884.4U CN208337943U (en) | 2018-05-21 | 2018-05-21 | A kind of integrated chip driving LED expansion current circuit |
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| Publication Number | Publication Date |
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| CN208337943U true CN208337943U (en) | 2019-01-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201820760884.4U Active CN208337943U (en) | 2018-05-21 | 2018-05-21 | A kind of integrated chip driving LED expansion current circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111642038A (en) * | 2020-06-04 | 2020-09-08 | 歌尔光学科技有限公司 | LED drive circuit and projector |
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2018
- 2018-05-21 CN CN201820760884.4U patent/CN208337943U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111642038A (en) * | 2020-06-04 | 2020-09-08 | 歌尔光学科技有限公司 | LED drive circuit and projector |
| CN111642038B (en) * | 2020-06-04 | 2022-09-20 | 歌尔光学科技有限公司 | LED drive circuit and projector |
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