CN103619094B - A kind of LED module, LED drive circuit and driving method - Google Patents
A kind of LED module, LED drive circuit and driving method Download PDFInfo
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- CN103619094B CN103619094B CN201310548967.9A CN201310548967A CN103619094B CN 103619094 B CN103619094 B CN 103619094B CN 201310548967 A CN201310548967 A CN 201310548967A CN 103619094 B CN103619094 B CN 103619094B
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Abstract
The invention discloses a kind of LED module, LED drive circuit and driving method, LED module includes the first field effect transistor, the second field effect transistor and the resistance being connected with two field effect transistor and LED；Two field effect transistor are N-type field effect transistor, the grid of the first field effect transistor and the source electrode of the second field effect transistor connect, the drain electrode of the first field effect transistor is connected with the grid of the second field effect transistor, and the grid of the second field effect transistor and the drain electrode of the first field effect transistor receive pwm signal；The drain electrode of LED and the second field effect transistor connects, and one end of described resistance is connected with the grid of the first field effect transistor and the source electrode of the second field effect transistor, the other end ground connection of resistance.Compared to prior art, the present invention uses field effect transistor to replace NPN transistor, the driving voltage threshold values temperature influence of field effect transistor is much smaller compared with NPN transistor, so the LED current size identical property limited and stability are wanted more preferably, to keep flow through the current constant of LED under various state of temperatures.
Description
Technical field
The present invention relates to technical field of LED illumination, particularly to a kind of LED module, LED drive circuit
And driving method.
Background technology
LED due to have energy-saving and environmental protection, can the lot of advantages such as light-operated, solidification, long-life, low advocating
Today of carbon life has been widely used for various lighting field.
Fig. 1 show a kind of traditional LED current control circuit, and pwm signal controls the first transistor 11
Conducting controls to flow through the size of current of LED with turning off, and resistance 12 coordinates with transistor seconds 13 to be affected
The power of pwm signal, thus determine that the conducting degree of the first transistor 11 i.e. flows through electric current, namely flow
Cross the size of LED current.
But, use general NPN transistor to control, the valve opened due to the base stage of transistor seconds 13
Threshold voltage is influenced by temperature very big, so the electric current flowing through LED can be caused to become along with the temperature of transistor
Change, and the biggest fluctuation occurs.
Summary of the invention
Instant invention overcomes above-mentioned the deficiencies in the prior art, it is provided that one can be at various temperature shapes
LED module, LED drive circuit and the driving method of the current constant of LED is kept flow through under state.
The technical scheme is that and be achieved in that:
A kind of LED module, including the first field effect transistor, the second field effect transistor and with the first field effect transistor and
The resistance of the second field effect transistor connection and LED；Described first field effect transistor and the second field effect transistor are N-type field
Effect pipe, all includes grid, drain electrode and source electrode；The grid of described first field effect transistor and the second field effect transistor
Source electrode connect, the drain electrode of the first field effect transistor is connected with the grid of the second field effect transistor, the second field effect transistor
Grid and the first field effect transistor drain electrode receive pwm signal；Described LED and the drain electrode of the second field effect transistor
Connecting, one end of described resistance is connected with the grid of the first field effect transistor and the source electrode of the second field effect transistor, electricity
The other end ground connection of resistance.
A kind of LED drive circuit, including alternating current power supply, filter unit, rectification unit and rectification unit even
The transformer unit that connects, flyback converting unit, transistor switch, color control unit and with color control
The LED module as claimed in claim 1 that unit connects, the grid and the of the second field effect transistor in LED module
The drain electrode of one field effect transistor connects color control unit and receives the pwm signal from color control unit, institute
State transformer unit and include primary and secondary, described alternating current power supply input AC alternating current, after filtering unit
With obtain DC voltage after rectification unit, flyback converting unit control transistor switch, such that it is able to control defeated
Go out the voltage levels to transformer unit secondary.
As preferably, described LED module includes a LED module, the 2nd LED module that color is different
With the 3rd LED module.
The driving method of a kind of LED drive circuit, constant-voltage is added in anode and the ginseng of LED in LED module
Examine between ground, when color control unit does not has pwm signal output to the second field effect transistor, the second field effect
Pipe is not turned on signal, then loop is obstructed, and LED is to extinguish；When color control unit has pwm signal to export
During to the second field effect transistor, LED has electric current and flows through, and lamp is lit, and the dutycycle of pwm signal directly affects
LED current size, thus affect the bright dark change of lamp bead.
As preferably, when flowing through the electric current of LED, also flowing through is that the voltage that the maximum current of resistance is formed reaches
To or exceed be connected to ohmically first field effect transistor drive foot threshold voltage time, the first field effect transistor quilt
Open, and then drag down the amplitude of pwm signal, limit the opening degree of the second field effect transistor, the second field effect
Portion voltage shared by pipe, limits the size of LED voltage, and then affects LED current size.
Compared to prior art, the present invention use field effect transistor to replace NPN transistor, driving of field effect transistor
Dynamic threshold voltage temperature influence is much smaller compared with NPN transistor, so the LED current limited is in the same size
Property and stability want more preferably, such that it is able to keep flow through the current constant of LED under various state of temperatures.
Accompanying drawing explanation
Fig. 1 is existing LED current control circuit figure；
Fig. 2 is LED drive circuit structure block diagram of the present invention；
Fig. 3 is LED modular circuit figure in LED drive circuit of the present invention.
Detailed description of the invention
The detailed description of the invention of the present invention is as follows:
Embodiment: Fig. 2 is LED drive circuit structure block diagram of the present invention, and Fig. 3 is that LED of the present invention drives electricity
LED modular circuit figure in road, as shown in Figures 2 and 3, LED drive circuit of the present invention include alternating current power supply 1,
Transformer unit 4 that filter unit 2, rectification unit 3 are connected with rectification unit 3, flyback converting unit 5,
Transistor switch 6, color control unit 7 and the LED module being connected with color control unit 7.Described change
Depressor unit 4 includes that primary and secondary, alternating current power supply 1 input AC alternating current, after filtering unit 2 He
Obtaining DC voltage after rectification unit 3, flyback converting unit 5 controls transistor switch 6, such that it is able to control
The height of the voltage exported on the electric capacity 9 of 4 levels of transformer unit, to reach to control output to electric capacity 9
On the purpose of voltage swing.
In the present embodiment, described LED module includes that color is different and in parallel with above-mentioned electric capacity 9
Oneth LED module the 81, the 2nd LED module 82 and the 3rd LED module 83, the such as the oneth LED module 81
Can be red LED module, the 2nd LED module 82 be green LED module, and the 3rd LED module 83 is
Blue led module.Color control unit 7 controls LED module 81, twoth LED in parallel with electric capacity 9
Module 82 and the output of the 3rd LED module 83 3 tunnel, thus reach the lamp output effect wanted.
Described LED module the 81, a 2nd LED module 82 is similar with the 3rd LED module 83 structure, often
Individual LED module 81 all include first field effect transistor the 84, second field effect transistor 85 and with the first field effect transistor
84 and second field effect transistor 85 connect resistance 86 and LED87, LED module the 81, a 2nd LED mould
The difference of group 82 and the 3rd LED module 83 is: the LED in a LED module is red LED, second
LED in LED module 82 is green LED, and the LED in the 3rd LED module is blue led.
Described first field effect transistor 84 and the second field effect transistor 85 are N-type field effect transistor, all include grid,
Drain electrode and source electrode, the grid of described first field effect transistor 84 and the source electrode of the second field effect transistor 85 connect, the
The drain electrode of one field effect transistor 84 is connected with the grid of the second field effect transistor 85, color control unit 7 output
Pwm signal gives grid and the drain electrode of the first field effect transistor 84 of the second field effect transistor 85, LED87 and
The drain electrode of two field effect transistor 85 connects, the grid of one end of described resistance 86 and the first field effect transistor 84 and the
The source electrode of two field effect transistor 85 connects, other end ground connection.
The driving process of LED drive circuit of the present invention is as follows: constant-voltage is added in the anode of LED and with reference to ground
Between, when color control unit 7 does not has pwm signal output to the second field effect transistor 85, the second field effect
Pipe 85 is not turned on signal, then loop is obstructed, and LED is to extinguish；When color control unit 7 has PWM to believe
Number output to the second field effect transistor 85 time, LED has electric current and flows through, and lamp is lit, the duty of pwm signal
Ratio directly affects LED current size, thus affects the bright dark change of lamp bead.
Being typically due on the premise of not having the first field effect transistor 84 impact, LED current can not limit maximum electricity
Stream, namely can not constant current, as long as lamp bead voltage varies slightly, LED current will have more than 50% or be more than
The current error of one times.And due to the fact that in each LED module, add resistance 86 and first respectively
Effect pipe 84, such that it is able to maximum current when limiting LED operation, such as: when flowing through the electric current of LED, also
The voltage flowing through the maximum current formation being resistance 86 meets or exceeds first be connected on resistance 86
When effect pipe 84 drives the threshold voltage of foot, the first field effect transistor 84 is opened, and then drags down pwm signal
Amplitude, limit the opening degree of the second field effect transistor 85, the second field effect transistor 85 shares portion voltage,
Limit the size of LED voltage, and then affect LED current size.
Compared to prior art, the present invention use field effect transistor to replace NPN transistor, therefore first effect
Should the driving voltage threshold values temperature influence of pipe 84 much smaller compared with NPN transistor, so the LED electricity limited
Stream size identical property and stability are wanted more preferably compared to NPN transistor, such that it is able under various state of temperatures
Keep flow through the current constant of LED.
It addition, in the present embodiment, LED module includes the first, second, and third LED module that color is different,
But the invention is not limited in three LED modules, one or more LED module can be arranged as required to,
And each LED module can be arranged as required to 1 to multiple LED.
The preferred embodiment of the present invention is only intended to help to illustrate the present invention.Preferred embodiment does not has detailed descriptionthe
All of details, is also not intended to the detailed description of the invention that this invention is only described.Obviously, according to this specification
Content, can make many modifications and variations.These embodiments are chosen and specifically described to this specification, be for
Preferably explain the principle of the present invention and actual application, so that skilled artisan can be fine
Utilize the present invention.The present invention is only limited by claims and four corner thereof and equivalent.Above public affairs
The several specific embodiments being only the application opened, but the application is not limited to this, the skill of any this area
What art personnel can think change, all should fall in the protection domain of the application.
Claims (3)
1. a LED drive circuit, is characterized in that: include alternating current power supply, filter unit, rectification unit,
The transformer unit that is connected with rectification unit, flyback converting unit, transistor switch, color control unit with
And the LED module being connected with color control unit, described LED module include the first field effect transistor, second
Field effect transistor and the resistance being connected with the first field effect transistor and the second field effect transistor and LED；Described first effect
Should manage and be N-type field effect transistor with the second field effect transistor, all include grid, drain electrode and source electrode；Described first
The grid of field effect transistor and the source electrode of the second field effect transistor connect, the drain electrode of the first field effect transistor and second effect
Should the grid of pipe connect, the drain electrode of the grid of the second field effect transistor and the first field effect transistor receives pwm signal；
The drain electrode of described LED and the second field effect transistor connects, one end of described resistance and the grid of the first field effect transistor
Connect with the source electrode of the second field effect transistor, the other end ground connection of resistance；The grid of the second field effect transistor in LED module
The drain electrode of pole and the first field effect transistor connects color control unit and receives the PWM letter from color control unit
Number, described transformer unit includes primary and secondary, and described alternating current power supply input AC alternating current, through filtering
Obtaining DC voltage after ripple unit and rectification unit, flyback converting unit controls transistor switch, such that it is able to
Control the output voltage levels to transformer unit secondary.
LED drive circuit the most according to claim 1, is characterized in that: described LED module includes
A LED module, the 2nd LED module and the 3rd LED module that color is different.
3. a driving method for LED drive circuit as claimed in claim 1, is characterized in that: constant voltage electricity
Pressure is added in the anode of LED in LED module and with reference between ground, when color control unit does not has pwm signal defeated
When going out to the second field effect transistor, the second field effect transistor is not turned on signal, then loop is obstructed, and LED is to extinguish；
When color control unit has pwm signal output to the second field effect transistor, LED has electric current and flows through, and lamp is by point
Bright, the dutycycle of pwm signal directly affects LED current size, thus affects the bright dark change of lamp bead；Work as stream
Crossing the electric current of LED, also flowing through is that the voltage that the maximum current of resistance is formed meets or exceeds and is connected to resistance
On first field effect transistor drive foot threshold voltage time, the first field effect transistor is opened, and then drags down PWM
The amplitude of signal, limits the opening degree of the second field effect transistor, and the second field effect transistor shares portion voltage, limit
The size of LED voltage processed, and then affect LED current size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310548967.9A CN103619094B (en) | 2013-11-07 | 2013-11-07 | A kind of LED module, LED drive circuit and driving method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310548967.9A CN103619094B (en) | 2013-11-07 | 2013-11-07 | A kind of LED module, LED drive circuit and driving method |
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| CN103619094A CN103619094A (en) | 2014-03-05 |
| CN103619094B true CN103619094B (en) | 2016-09-14 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103889116A (en) | 2014-03-14 | 2014-06-25 | 浙江生辉照明有限公司 | LED driving circuit composed of discrete devices |
| CN108112129B (en) * | 2018-01-10 | 2023-12-12 | 生迪智慧科技有限公司 | LED constant current driving circuit |
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Denomination of invention: LED module, LED drive circuit and drive method Effective date of registration: 20191123 Granted publication date: 20160914 Pledgee: China CITIC Bank Co.,Ltd. Jiaxing Tongxiang sub branch Pledgor: ZHEJIANG SHENGHUI LIGHTING Co.,Ltd. Registration number: Y2019330000238 |
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Date of cancellation: 20230208 Granted publication date: 20160914 Pledgee: China CITIC Bank Co.,Ltd. Jiaxing Tongxiang sub branch Pledgor: ZHEJIANG SHENGHUI LIGHTING Co.,Ltd. Registration number: Y2019330000238 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: LED module, LED driving circuit and driving method Effective date of registration: 20230210 Granted publication date: 20160914 Pledgee: China CITIC Bank Co.,Ltd. Jiaxing Tongxiang sub branch Pledgor: ZHEJIANG SHENGHUI LIGHTING Co.,Ltd. Registration number: Y2023330000340 |