CN108124344A - Constant current led drive circuit - Google Patents
Constant current led drive circuit Download PDFInfo
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- CN108124344A CN108124344A CN201611086010.7A CN201611086010A CN108124344A CN 108124344 A CN108124344 A CN 108124344A CN 201611086010 A CN201611086010 A CN 201611086010A CN 108124344 A CN108124344 A CN 108124344A
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- 230000033228 biological regulation Effects 0.000 claims abstract description 7
- 238000004806 packaging method and process Methods 0.000 claims abstract description 3
- 239000004065 semiconductor Substances 0.000 claims description 36
- 230000005669 field effect Effects 0.000 claims description 21
- 230000005611 electricity Effects 0.000 claims description 2
- 230000009977 dual effect Effects 0.000 description 5
- 238000005538 encapsulation Methods 0.000 description 5
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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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]
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Abstract
The present invention relates to a kind of constant current LED drive circuits, low-voltage driving chip module and power mos chip module including integral packaging, wherein low-voltage driving chip module has low-voltage power supply end VDD, drain terminal Drain, ground terminal GND and grid end GD, low-voltage power supply end VDD is grounded by electric capacity of voltage regulation, ground terminal GND passes through resistance eutral grounding, drain electrode, source electrode and the grid of power mos chip module connect one to one respectively with low-voltage driving chip module drain terminal Drain, ground terminal GND and grid end GD, and drain terminal Drain is the output terminal of the constant current LED drive circuit.Using the constant current LED drive circuit of the structure, output current is more stable, reliability higher, and circuit inner structure is simple, cost-effective, and the product is enabled to be suitable for large-power occasions, and the scope of application of product greatly increases.
Description
Technical field
The present invention relates to LED drive circuit field, more particularly to driving chip and high-voltage power MOS dual chips encapsulates
Field of LED drive, in particular to a kind of constant current LED drive circuit.
Background technology
The application range of LED drive circuit is very extensive in the prior art, and species is also very various.Wherein,
Chinese patent literature 1 (CN201210540481.6, denomination of invention：The LED drive circuit controlled using parallel high voltage metal-oxide-semiconductor) it is public
A kind of LED drive circuit controlled using parallel high voltage metal-oxide-semiconductor is opened, cost can not be taken into account by mainly solving existing driving circuit
It is low, efficient, the problem of power factor is high.As shown in Figure 1, it includes rectifier bridge, control circuit, N string loads, N number of high-pressure MOS
Pipe and N number of voltage reference circuit:Rectifier bridge is used to carry out AC signal full-wave rectification, and N string loads single group is connected in series, and across
It is connected to the drain electrode of rectifier bridge and n-th high-voltage MOS pipe:The common port of adjacent two strings load is connected respectively to corresponding high-voltage MOS pipe
Drain electrode；The grid of N number of high-voltage MOS pipe connects N number of voltage reference respectively, and source electrode is connected, and is connected to control circuit:Control
Circuit adjusts the source voltage of high-voltage MOS pipe by detecting load current, to control the working condition of high-voltage MOS pipe, realization pair
Access the adjusting of circuit load.The invention has the advantages that few peripheral components, long lifespan, efficiency and power factor are high, can be direct
Be integrated in be loaded with LED string order on plate.
Chinese patent literature 2 (CN201610307576.1, denomination of invention：A kind of both-end constant-current LED driving chip) it is open
Another both-end constant-current LED driving chip, as shown in Fig. 2, being adjusted including power supply module 10, constant flow module 50, excess temperature
Module 30, chip input port 70 and chip output mouth 80；Chip input port connects the cathode of chip exterior LED light group,
Chip output mouth is used to connect the ground terminal of chip exterior circuit.Constant flow module includes drive circuit module 20, power tube 60
With current control module 40, drive circuit module connection power tube and current control module, for the driving on sampled power pipe
Size of current, and according to the conducting state of driving current control power tube.The invention can be according to the temperature of chip to the electricity of LED
Stream is simultaneously and dynamically adjusted, and using double-ended structure, current-limiting circuit is integrated in chip internal, simplifies LED current control
The structure of chip, reduces cost, and circuit is facilitated to connect.
However it is how simple in circuit inner structure, on the premise of at low cost, further solve constant current LED drive circuit
The problem of application range of products is too small becomes the technical issues of this field one is urgently to be resolved hurrily.
The content of the invention
The purpose of the present invention is overcome it is above-mentioned in the prior art the shortcomings that, provide that a kind of circuit structure is simple, it is big to be applicable in
Power occasion manufactures the relatively broad constant current LED drive circuit of relatively low cost, stable and reliable working performance, the scope of application.
In order to realize above-mentioned purpose, constant current LED drive circuit of the invention has following form：
The constant current LED drive circuit, low-voltage driving chip module and power mos chip mould including integral packaging
Block is mainly characterized by, the low-voltage driving chip module have low-voltage power supply end VDD, drain terminal Drain, ground terminal GND and
Grid end GD, the low-voltage power supply end VDD are grounded by electric capacity of voltage regulation, and the ground terminal GND is described by resistance eutral grounding
Drain electrode, source electrode and the grid of power mos chip module respectively with the low-voltage driving chip module drain terminal Drain, ground terminal
GND and grid end GD connect one to one, and the drain terminal Drain is the output terminal of the constant current LED drive circuit.
The low-voltage driving chip module is built-in with high-voltage starting circuit unit, the high-voltage starting circuit unit bag
JFET field-effect tube, the first high-voltage power metal-oxide-semiconductor are included, low-voltage control circuit list is further included in the low-voltage driving chip module
Member, the grounded-grid of the JFET field-effect tube, the JFET field-effect tube are total to the first high-voltage power metal-oxide-semiconductor
It drains and is connected to the drain terminal Drain.The source electrode of the JFET field-effect tube passes sequentially through the low-voltage control circuit
Unit, low-voltage power supply end VDD are connected with the electric capacity of voltage regulation.The grid and source electrode of the first high-voltage power metal-oxide-semiconductor
It is connected with the low-voltage control circuit unit, the grid of the first high-voltage power metal-oxide-semiconductor is connected to the grid end
GD, and the source electrode of the first high-voltage power metal-oxide-semiconductor is connected to the ground terminal GND.
The JFET field-effect tube is N-channel JFET field-effect tube.
The first high-voltage power metal-oxide-semiconductor is the first NMOS tube.
The power mos chip module includes the second high-voltage power metal-oxide-semiconductor.The second high-voltage power metal-oxide-semiconductor
Drain electrode be connected to the drain terminal Drain of the low-voltage driving chip module, the grid of the second high-voltage power metal-oxide-semiconductor is connected to
The grid end GD of the low-voltage driving chip module, and the source electrode of the second high-voltage power metal-oxide-semiconductor is connected to the low pressure
The ground terminal GND of driving chip module.
The second high-voltage power metal-oxide-semiconductor that the power mos chip module includes is the second NMOS tube.
The constant current LED drive circuit of the invention is employed, the low of high-voltage starting circuit is carried due to which using
Press driving chip so that output current is more stable, reliability higher, while uses low-voltage driving chip and power mos chip again
Dual chip encapsulation is carried out, so as to enormously simplify circuit inner structure, manufacture cost has been saved, and product is suitable for
Large-power occasions, the scope of application of product greatly increase.
Description of the drawings
Fig. 1 is the power supply circuit schematic diagram of low-voltage driving chip of the prior art.
Fig. 2 is the structure principle chart of another LED drive circuit of the prior art.
Fig. 3 is the integrated circuit principle schematic of the constant current LED drive circuit of the present invention.
Reference numeral
AC bridge heap motor-generator sets
C1, C2 capacitance
JFET N-channel JFET field-effect tube
VDD low-voltage power supplies end
Drain drain terminals
MN1 the first high-voltage power metal-oxide-semiconductors
MN2 the second high-voltage power metal-oxide-semiconductors
GD grid ends
D drains
G grids
S source electrodes
Specific embodiment
In order to be more clearly understood that the technology contents of the present invention, spy lifts following embodiment and is described in detail.
It refers to shown in Fig. 3, for the whole principle schematic of the constant current LED drive circuit of the present invention, the constant current
LED drive circuit includes low-voltage driving chip module and power mos chip module, and the low-voltage driving chip module is for being
Other module for power supply inside circuit；The power mos chip module is used to carry out dual chip encapsulation with driving chip, increases product
Applicability.
Low-voltage driving chip module includes high-voltage starting circuit unit, low-voltage power supply end VDD, drain terminal Drain, ground terminal
GND and grid end GD, the low-voltage power supply end VDD are grounded by electric capacity of voltage regulation, the ground terminal GND by resistance eutral grounding,
Low-voltage control circuit unit is further included in the low-voltage driving chip module.The high-voltage starting circuit unit includes JFET
Field-effect tube, the first high-voltage power metal-oxide-semiconductor, the grounded-grid of the JFET field-effect tube, the JFET field-effect tube with
The first high-voltage power metal-oxide-semiconductor common drain and be connected to the drain terminal Drain, the source electrode of the JFET field-effect tube according to
Secondary to be connected by the low-voltage control circuit unit, low-voltage power supply end VDD with the electric capacity of voltage regulation, described first is high
The grid and source electrode for pressing power MOS pipe are connected with the low-voltage control circuit unit, the first high-voltage power MOS
The grid of pipe is connected to the grid end GD, and the source electrode of the first high-voltage power metal-oxide-semiconductor is connected to the ground terminal GND.
The JFET field-effect tube is N-channel JFET field-effect tube.The first high-voltage power metal-oxide-semiconductor is the first NMOS tube.
Wherein, the function of the low-voltage control circuit unit is that control JEFT gives capacitance C2 charge and discharge so that vdd voltage
It is constant, and control the turn-on and turn-off of power tube MN1 and MN2 so that it is constant to flow through the electric current of LED, the low-voltage control circuit
Each component in unit is operated on low-pressure state, and entire circuit is under operating on low voltage pattern.Meanwhile the low pressure
Control circuit unit is realizes the conventional func circuit of LED drivings in the prior art, thus details are not described herein.
Meanwhile drain electrode, source electrode and the grid that the power mos chip module includes, the drain electrode, source electrode and grid point
It does not connect one to one with low-voltage driving chip module drain terminal Drain, ground terminal GND and the grid end GD.The power
MOS chip modules further include the second high-voltage power metal-oxide-semiconductor, and the drain electrode of the second high-voltage power metal-oxide-semiconductor is connected to described low
The drain terminal Drain of driving chip module is pressed, the grid of the second high-voltage power metal-oxide-semiconductor is connected to the low-voltage driving chip
The grid end GD of module, and the source electrode of the second high-voltage power metal-oxide-semiconductor is connected to the ground connection of the low-voltage driving chip module
Hold GND.The second high-voltage power metal-oxide-semiconductor is the second NMOS tube.
The specific work process of the constant current LED drive circuit is specific as follows：
(1) alternating voltage input forms DC voltage after bridge heap motor-generator set capacitance C1 filtering；
(2) N-channel JFET field-effect tube is charged by low-voltage control circuit unit in chip to the capacitance C2 of VDD connections,
And pass through internal control by vdd voltage stabilization in certain value, so as to generate an accurately low tension of the voltage value as chip
Source；
(3) driving chip described in can with single-chip package, suitable for small-power occasion, can also and power mos chip
Carry out dual chip encapsulation together, the drain D of power MOS, grid G, source S pin drain terminal Drain, grid with driving chip respectively
GD and ground terminal GND is held, is held together, there are three pin drain terminal Drain, low-voltage power supply end VDD and ground connection for the circuit after encapsulation
GND is held, suitable for large-power occasions；Since N-channel JFET field-effect tube is connected with the drain terminal of power MOS pipe, two devices
Pressure voltage requires that comparison is high, the high tension apparatus being synthesized together in device realization with JEFT and high-voltage power metal-oxide-semiconductor, such two
A public drain region area of device, so as to save chip area；
(4) when being suitable for small-power, during system worked well, the first NMOS tube MN1 conductings, inductance L energy storage, inductive current
Rise, electric current flow through power tube MN1 and Rcs, and low-voltage control circuit unit is become by detecting CS pin voltages and MN1 grid voltages
Change, realize the switch control of power tube.
(5) when being suitable for high-power, during system worked well, the first NMOS tube MN1 conductings, inductance L energy storage, inductive current
Rise, electric current flow through power tube MN1 and MN2, flow to ground terminal GND finally by Rcs, low-voltage control circuit unit passes through simultaneously
CS pin voltages and grid end GD voltage changes are detected, realizes the switch control of power tube.
The constant current LED drive circuit of the invention is employed, the low of high-voltage starting circuit is carried due to which using
Press driving chip so that output current is more stable, reliability higher, while uses low-voltage driving chip and power mos chip again
Dual chip encapsulation is carried out, so as to enormously simplify circuit inner structure, manufacture cost has been saved, and product is suitable for
Large-power occasions, the scope of application of product greatly increase.
In this description, the present invention is described with reference to its specific embodiment.But it is clear that it can still make
Various modifications and alterations are without departing from the spirit and scope of the present invention.Therefore, specification and drawings should be considered as illustrative
And not restrictive.
Claims (6)
1. a kind of constant current LED drive circuit, low-voltage driving chip module and power mos chip module including integral packaging,
It being characterized in that, the low-voltage driving chip module has low-voltage power supply end VDD, drain terminal Drain, ground terminal GND and grid end GD,
The low-voltage power supply end VDD is grounded by electric capacity of voltage regulation, and the ground terminal GND passes through resistance eutral grounding, the drain terminal
Drain is the output terminal of the constant current LED drive circuit；
Drain electrode, source electrode and the grid of the power mos chip module respectively with the low-voltage driving chip module drain terminal
Drain, ground terminal GND and grid end GD connect one to one.
2. constant current LED drive circuit according to claim 1, which is characterized in that in the low-voltage driving chip module
Built-in high-voltage starting circuit unit and low-voltage control circuit unit are further included, the high-voltage starting circuit unit includes JFET
Field-effect tube, the first high-voltage power metal-oxide-semiconductor；
The grounded-grid of the JFET field-effect tube, the JFET field-effect tube and the first high-voltage power metal-oxide-semiconductor
Common drain and the drain terminal Drain is connected to, the source electrode of the JFET field-effect tube passes through the low voltage control electricity respectively
Road unit, low-voltage power supply end VDD are connected with the electric capacity of voltage regulation, the grid of the first high-voltage power metal-oxide-semiconductor and source
Extremely be connected with the low-voltage control circuit unit, at the same the grid of the first high-voltage power metal-oxide-semiconductor be connected to it is described
Grid end GD, and the source electrode of the first high-voltage power metal-oxide-semiconductor is connected to the ground terminal GND.
3. constant current LED drive circuit according to claim 2, which is characterized in that the JFET field-effect tube is N-channel
JFET field-effect tube.
4. constant current LED drive circuit according to claim 2, which is characterized in that the first high-voltage power metal-oxide-semiconductor is
First NMOS tube.
5. constant current LED drive circuit according to any one of claim 1 to 4, which is characterized in that the power MOS
Chip module includes the second high-voltage power metal-oxide-semiconductor, and the drain electrode of the second high-voltage power metal-oxide-semiconductor is connected to the low pressure and drives
The drain terminal Drain of dynamic chip module, the grid of the second high-voltage power metal-oxide-semiconductor are connected to the low-voltage driving chip module
Grid end GD, and the source electrode of the second high-voltage power metal-oxide-semiconductor is connected to the ground terminal of the low-voltage driving chip module
GND。
6. constant current LED drive circuit according to claim 5, which is characterized in that the second high-voltage power metal-oxide-semiconductor is
Second NMOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611086010.7A CN108124344A (en) | 2016-11-30 | 2016-11-30 | Constant current led drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611086010.7A CN108124344A (en) | 2016-11-30 | 2016-11-30 | Constant current led drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108124344A true CN108124344A (en) | 2018-06-05 |
Family
ID=62227218
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611086010.7A Pending CN108124344A (en) | 2016-11-30 | 2016-11-30 | Constant current led drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108124344A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112770449A (en) * | 2019-11-05 | 2021-05-07 | 华域视觉科技(上海)有限公司 | Constant current driving system for automobile signal lamp and driving method thereof |
| CN117082676A (en) * | 2023-10-16 | 2023-11-17 | 深圳市暗能量电源有限公司 | Packaging structure of linear constant current driving chip and preparation method thereof |
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| CN101909376A (en) * | 2009-06-08 | 2010-12-08 | 海洋王照明科技股份有限公司 | High-power LED drive circuit |
| CN101916962A (en) * | 2010-09-02 | 2010-12-15 | 吉林大学 | Equal-current synthetic high-power constant current power supply circuit |
| CN104219855A (en) * | 2014-09-28 | 2014-12-17 | 广东工业大学 | Strobe-free LED constant-flow drive control circuit based on APFC |
| CN204696946U (en) * | 2015-06-30 | 2015-10-07 | 华润矽威科技（上海）有限公司 | High pressure self-powered circuit |
| CN204810620U (en) * | 2015-07-15 | 2015-11-25 | 华润矽威科技（上海）有限公司 | Linear LED drive circuit of segmentation |
| CN204859602U (en) * | 2015-07-23 | 2015-12-09 | 宁波拓扑思科电子科技有限公司 | LED driver chip's zero passage current detection circuit and use thereof |
| CN204859633U (en) * | 2015-06-30 | 2015-12-09 | 蚌埠崧欣电子科技有限公司 | LED driver chip , LED drive circuit and LED lamps and lanterns |
| CN206196098U (en) * | 2016-11-30 | 2017-05-24 | 无锡华润矽科微电子有限公司 | Constant current led drive circuit |
-
2016
- 2016-11-30 CN CN201611086010.7A patent/CN108124344A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101909376A (en) * | 2009-06-08 | 2010-12-08 | 海洋王照明科技股份有限公司 | High-power LED drive circuit |
| CN101916962A (en) * | 2010-09-02 | 2010-12-15 | 吉林大学 | Equal-current synthetic high-power constant current power supply circuit |
| CN104219855A (en) * | 2014-09-28 | 2014-12-17 | 广东工业大学 | Strobe-free LED constant-flow drive control circuit based on APFC |
| CN204696946U (en) * | 2015-06-30 | 2015-10-07 | 华润矽威科技（上海）有限公司 | High pressure self-powered circuit |
| CN204859633U (en) * | 2015-06-30 | 2015-12-09 | 蚌埠崧欣电子科技有限公司 | LED driver chip , LED drive circuit and LED lamps and lanterns |
| CN204810620U (en) * | 2015-07-15 | 2015-11-25 | 华润矽威科技（上海）有限公司 | Linear LED drive circuit of segmentation |
| CN204859602U (en) * | 2015-07-23 | 2015-12-09 | 宁波拓扑思科电子科技有限公司 | LED driver chip's zero passage current detection circuit and use thereof |
| CN206196098U (en) * | 2016-11-30 | 2017-05-24 | 无锡华润矽科微电子有限公司 | Constant current led drive circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112770449A (en) * | 2019-11-05 | 2021-05-07 | 华域视觉科技(上海)有限公司 | Constant current driving system for automobile signal lamp and driving method thereof |
| CN112770449B (en) * | 2019-11-05 | 2024-02-02 | 华域视觉科技(上海)有限公司 | Constant-current driving system for automobile signal lamp and driving method thereof |
| CN117082676A (en) * | 2023-10-16 | 2023-11-17 | 深圳市暗能量电源有限公司 | Packaging structure of linear constant current driving chip and preparation method thereof |
| CN117082676B (en) * | 2023-10-16 | 2024-02-02 | 深圳市暗能量电源有限公司 | Packaging structure of linear constant current driving chip and preparation method thereof |
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