CN207443184U - A kind of super long type constant current lamp bar of brightness uniformity - Google Patents
A kind of super long type constant current lamp bar of brightness uniformity Download PDFInfo
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- CN207443184U CN207443184U CN201721686155.0U CN201721686155U CN207443184U CN 207443184 U CN207443184 U CN 207443184U CN 201721686155 U CN201721686155 U CN 201721686155U CN 207443184 U CN207443184 U CN 207443184U
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- module
- transistor
- lamp bar
- brightness uniformity
- biasing
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
Abstract
The utility model provides a kind of super long type constant current lamp bar of brightness uniformity, is related to LED light bar, including LED light string, the current adjusting module being connected with LED light string, the biasing module being connected with current adjusting module and sampled reference module；The biasing module provides the bias current of normal work for current adjusting module, and after comparing amplification, biasing module is adjusted with negative feedback mode, LED operation electric current is adjusted by adjusting module for the sampled reference module real-time sampling LED operation electric current.Compared with prior art, a kind of super long type constant current lamp bar of brightness uniformity of the utility model, if it is arranged in by the driving circuit rectilinear direction of main line parallel connection on lamp bar product, all electric currents for flowing through LED element are all that controllable and size of current is consistent, realize that lamp bar brightness uniformity is consistent, promote the experience sense of user, solves the factor due to line impedance, lamp bar is in the case where series connection length is longer, and voltage will progressively decay, so the problem of causing two ends luminance difference larger.
Description
[technical field]
The utility model is related to LED light bars, and in particular to a kind of super long type constant current lamp bar of brightness uniformity.
[background technology]
LED is light emitting diode, is a kind of solid state semiconductor devices that can convert electrical energy into visible ray, it can be with
Electricity is directly converted into light.The heart of LED is the chip of a semiconductor, and one end of chip is attached on a stent, and one end is
Cathode, the other end connect the anode of power supply, make entire chip by epoxy encapsulation.
At present, RGB/RGBW, the LED light bar circuit majority of double-colored mild monochrome are based on resistance current limliting in the market, work
Make that electric current influence by voltage is larger, due to the factor of line impedance, for lamp bar in the case where series connection length is longer, voltage will progressively
Attenuation, so causing two ends luminance difference larger.
[utility model content]
To overcome the problems of prior art, the utility model provides a kind of super long type constant current lamp of brightness uniformity
Item solves the factor due to line impedance, and lamp bar is in the case where series connection length is longer, and voltage will progressively decay, so causing
The problem of two ends luminance difference is larger.
The scheme of the utility model solution technical problem is to provide a kind of super long type constant current lamp bar of brightness uniformity, including
LED light string, the current adjusting module being connected with LED light string, the biasing module being connected with current adjusting module and sampled reference mould
Block；The biasing module provides the bias current of normal work, the sampled reference module real-time sampling for current adjusting module
LED operation electric current, after comparing amplification, biasing module is adjusted with negative feedback mode, and LED operation electricity is adjusted by adjusting module
Stream.
Preferably, the biasing module is biasing resistor R1.
Preferably, another termination electric current of the first termination feeder ear V+, the biasing resistor R1 of the biasing resistor R1
Adjust the base stage of module and the collector of sampled reference source module.
Preferably, the current adjusting module is transistor Q2.
The transistor Q2 is metal-oxide-semiconductor.
Preferably, the base stage of the transistor Q2 connects one end of biasing resistor R1 in biasing module, and connects sampled reference
The collector of transistor Q1 in source module；The collector of the transistor Q2 is connected with the LED light string；The transistor Q2's
Emitter is connected with one end of sampling resistor R2 in sampled reference source module.
Preferably, the sampled reference module is made of transistor Q1 and sampling resistor R2, the transistor Q1 and sampling
Resistance R2 connects.
Preferably, the collector of the transistor Q1 is connected with biasing resistor R1, and connects transistor Q2 base stages；Transistor
Q1 base stages are connected with the first end of sampling resistor R2, and connect transistor Q1 emitters；Transistor Q1 emitters meet feeder ear V-；
Another termination feeder ear V- of sampling resistor R2.
Compared with prior art, the super long type constant current lamp bar of a kind of brightness uniformity of the utility model, if in parallel by main line
Driving circuit rectilinear direction be arranged on lamp bar product, all electric currents for flowing through LED element are all controllable and size of current
Unanimously, realize that lamp bar brightness uniformity is consistent, promote the experience sense of user, solve the factor due to line impedance, lamp bar exists
In the case that length of connecting is longer, voltage will progressively decay, so the problem of causing two ends luminance difference larger.
[description of the drawings]
Fig. 1 is a kind of super long type constant current lamp bar electrical block diagram of brightness uniformity of the utility model；
Fig. 2 is a kind of 1 color LED lamp circuit diagram of super long type constant current lamp bar embodiment of brightness uniformity of the utility model；
Fig. 3 is a kind of 1 another circuit of color LED lamp of super long type constant current lamp bar embodiment of brightness uniformity of the utility model
Figure；
Fig. 4 is a kind of 2 color LED lamp circuit diagram of super long type constant current lamp bar embodiment of brightness uniformity of the utility model.
[specific embodiment]
To make the purpose of this utility model, technical solution and advantage are more clearly understood, with reference to the accompanying drawings and embodiments,
The utility model is further elaborated.It should be appreciated that specific embodiment described herein is used only for explaining this
Utility model is not used to limit this utility model.
Referring to Fig. 1, a kind of super long type constant current lamp bar of brightness uniformity of the utility model, including LED light string, with LED light
The connected current adjusting module of string, the biasing module being connected with current adjusting module and sampled reference module；The biasing module
The bias current of normal work is provided for current adjusting module, the sampled reference module real-time sampling LED operation electric current, through than
After amplification, biasing module is adjusted with negative feedback mode, LED operation electric current is adjusted by adjusting module.
Fig. 2-3, a kind of super long type constant current lamp bar of brightness uniformity of the utility model, the biasing are referred in embodiment 1
Module is biasing resistor R1.
Another termination current adjusting module of the first termination feeder ear V+, the biasing resistor R1 of the biasing resistor R1
Base stage and sampled reference source module collector.
The current adjusting module is transistor Q2.The transistor Q2 manages for PNP pipe or NPN.
The base stage of the transistor Q2 connects one end of biasing resistor R1 in biasing module, and connects in sampled reference source module
The collector of transistor Q1；The collector of the transistor Q2 is connected with the LED light string；The emitter of the transistor Q2 with
One end connection of sampling resistor R2 in sampled reference source module.
The sampled reference module is made of transistor Q1 and sampling resistor R2, and the transistor Q1 and sampling resistor R2 goes here and there
Connection.
The collector of the transistor Q1 is connected with biasing resistor R1, and connects transistor Q2 base stages；Transistor Q1 base stages
It is connected with the first end of sampling resistor R2, and connects transistor Q1 emitters；Transistor Q1 emitters meet feeder ear V-；Sampling electricity
Hinder another termination feeder ear V- of R2.
In embodiment 2, referring to Fig. 4, a kind of super long type constant current lamp bar of brightness uniformity of the utility model, the biasing mould
Block is biasing resistor R1.
Another termination current adjusting module of the first termination feeder ear V+, the biasing resistor R1 of the biasing resistor R1
The base stage of Q2 and the collector of sampled reference source module Q1.
The current adjusting module is transistor Q2.The transistor Q2 is metal-oxide-semiconductor.
The base stage of the transistor Q2 connects one end of biasing resistor R1 in biasing module, and connects in sampled reference source module
The collector of transistor Q1；The collector of the transistor Q2 is connected with the LED light string；The emitter of the transistor Q2 with
One end connection of sampling resistor R2 in sampled reference source module.
The sampled reference module is made of transistor Q1 and sampling resistor R2, and the transistor Q1 and sampling resistor R2 goes here and there
Connection.
The collector of the transistor Q1 is connected with biasing resistor R1, and connects transistor Q2 base stages；Transistor Q1 base stages
It is connected with the first end of sampling resistor R2, and connects transistor Q1 emitters；Transistor Q1 emitters meet feeder ear V-；Sampling electricity
Hinder another termination feeder ear V- of R2.
Operation logic is：Power supply side V+ provides bias current, electric current tune by biasing module to current adjusting module
Mould preparation block is opened, and the LED light string of series connection is made to generate electric current, after which flows through current adjusting module, the sampling electricity by series connection
Resistance generates sampled current signals, which is amplified by sampled reference source module, adjusts the adjustment module that is attached thereto
Bias current.By this negative feedback process, make LED light string electric current constant.By adjusting the size of sampling resistor value, can adjust
The operating current of LED.
Constant current is still kept in order to achieve the effect that concatenate over long distances, the designing impedance matching of circuit is especially heavy on lamp bar PCB
It will.The utility model is by the way of lamp string voltage and line drop attenuation comprehensive matching, by the matching of circuit difference line width,
Reach the purpose for concatenating constant current over long distances.
Double-colored temperature LED light is identical with the circuit structure principle of color LED lamp with the circuit structure of monochromatic warm LED light, colored
LED is three tunnels, and dual-colored LED is two-way, and monochromatic LED is 1 tunnel, is only that way is different, can change the road of circuit according to actual conditions
Number.
Compared with prior art, the super long type constant current lamp bar of a kind of brightness uniformity of the utility model, if in parallel by main line
Driving circuit rectilinear direction be arranged on lamp bar product, all electric currents for flowing through LED element are all controllable and size of current
Unanimously, realize that lamp bar brightness uniformity is consistent, promote the experience sense of user, solve the factor due to line impedance, lamp bar exists
In the case that length of connecting is longer, voltage will progressively decay, so the problem of causing two ends luminance difference larger.
Above-described the utility model embodiment, does not form the restriction to scope of protection of the utility model.It is any
Modifications, equivalent substitutions and improvements made within spirit of the present utility model and principle etc., should be included in the utility model
Claims within.
Claims (8)
1. a kind of super long type constant current lamp bar of brightness uniformity, it is characterised in that：Including LED light string, the electric current being connected with LED light string
Adjustment module, the biasing module being connected with current adjusting module and sampled reference module；The biasing module adjusts mould for electric current
The bias current of block offer normal work, the sampled reference module real-time sampling LED operation electric current, after comparing amplification, with
Negative feedback mode adjusts biasing module, and LED operation electric current is adjusted by adjusting module.
2. a kind of super long type constant current lamp bar of brightness uniformity as described in claim 1, it is characterised in that：The biasing module is
Biasing resistor R1.
3. a kind of super long type constant current lamp bar of brightness uniformity as claimed in claim 2, it is characterised in that：The biasing resistor R1
The first termination feeder ear V+, the biasing resistor R1 the base stage of another termination current adjusting module and sampled reference source mould
The collector of block.
4. a kind of super long type constant current lamp bar of brightness uniformity as described in claim 1, it is characterised in that：The electric current adjusts mould
Block is transistor Q2.
5. a kind of super long type constant current lamp bar of brightness uniformity as claimed in claim 4, it is characterised in that：The transistor Q2 is
Metal-oxide-semiconductor.
6. a kind of super long type constant current lamp bar of brightness uniformity as claimed in claim 4, it is characterised in that：The transistor Q2's
Base stage connects one end of biasing resistor R1 in biasing module, and connects the collector of transistor Q1 in sampled reference source module；It is described
The collector of transistor Q2 is connected with the LED light string；The emitter of the transistor Q2 in sampled reference source module with sampling
One end connection of resistance R2.
7. a kind of super long type constant current lamp bar of brightness uniformity as described in claim 1, it is characterised in that：The sampled reference mould
Block is made of transistor Q1 and sampling resistor R2, and the transistor Q1 connects with sampling resistor R2.
8. a kind of super long type constant current lamp bar of brightness uniformity as claimed in claim 6, it is characterised in that：The transistor Q1's
Collector is connected with biasing resistor R1, and connects transistor Q2 base stages；Transistor Q1 base stages and the first end phase of sampling resistor R2
Even, and transistor Q1 emitters are connected；Transistor Q1 emitters meet feeder ear V-；Another termination feeder ear of sampling resistor R2
V-。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721686155.0U CN207443184U (en) | 2017-12-07 | 2017-12-07 | A kind of super long type constant current lamp bar of brightness uniformity |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721686155.0U CN207443184U (en) | 2017-12-07 | 2017-12-07 | A kind of super long type constant current lamp bar of brightness uniformity |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207443184U true CN207443184U (en) | 2018-06-01 |
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ID=62285842
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721686155.0U Active CN207443184U (en) | 2017-12-07 | 2017-12-07 | A kind of super long type constant current lamp bar of brightness uniformity |
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| CN (1) | CN207443184U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905484A (en) * | 2021-10-12 | 2022-01-07 | 恒亦明（重庆）科技有限公司 | Low-voltage LED lamp strip |
-
2017
- 2017-12-07 CN CN201721686155.0U patent/CN207443184U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113905484A (en) * | 2021-10-12 | 2022-01-07 | 恒亦明（重庆）科技有限公司 | Low-voltage LED lamp strip |
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