CN102333402A - Drive circuit of LED lamp - Google Patents
Drive circuit of LED lamp Download PDFInfo
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- CN102333402A CN102333402A CN201110147721A CN201110147721A CN102333402A CN 102333402 A CN102333402 A CN 102333402A CN 201110147721 A CN201110147721 A CN 201110147721A CN 201110147721 A CN201110147721 A CN 201110147721A CN 102333402 A CN102333402 A CN 102333402A
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- led lamp
- current amplification
- amplification module
- electronic switch
- module
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Abstract
The invention discloses a drive circuit of an LED lamp, wherein the drive circuit enables an average current passing through the LED to be basically constant when the LED lamp is lightened. The drive circuit comprises a current amplification module and an electronic switch module; a control terminal of the current amplification module is connected with a signal source through an input resistance; an output terminal of the current amplification module is connected with a power supply anode of an LED lamp through the LED lamp; an output terminal of the electronic switch module is connected with the control terminal of the current amplification module; a control terminal of the electronic switch module is connected with a negative feedback point of the current amplification module; and earth terminals of the current amplification module and the electronic switch module are both connected with the power supply cathode of the LED lamp. According to the invention, an electronic switch module and a current amplification module are cooperated with each other, so that an oscillation output of the current amplification module is realized, an LED is conductive intermittently, and service life of an LED lamp is substantially improved.
Description
Technical field
The present invention relates to light-emitting diode is LED, refers more particularly to string through a plurality of LED, and the drive circuit of the LED lamp that constitutes.
Background technology
The drive circuit of present LED lamp, employing all be the mode of constant voltage, resistance current limliting.In actual use, LED can generate heat in luminescence process, makes the pressure drop at LED two ends change; Small change in voltage; The electric current that will cause flowing through LED sharply increases, and is very easy to burn out LED, so just greatly reduces the useful life of whole LED lamp.
Summary of the invention
Technical problem to be solved by this invention is: a kind of drive circuit that when lighting the LED lamp, makes the substantially invariable LED lamp of average current flow through LED is provided.
For solving the problems of the technologies described above; The technical scheme that the present invention adopted is: the drive circuit of LED lamp; Comprise: electric current amplification module and electronic switch module, the control end of electric current amplification module links to each other with signal source through input resistance, and the output of electric current amplification module links to each other with LED lamp positive source through the LED lamp; The output of electronic switch module links to each other with the control end of electric current amplification module, and the control end of electronic switch module links to each other with the negative feedback point of electric current amplification module; The earth terminal of electric current amplification module and electronic switch module all links to each other with the negative pole of LED lamp power supply.
The drive circuit of said LED lamp also comprises: output control module after the earth terminal of described electric current amplification module and electronic switch module links to each other, links to each other through the negative pole of output control module with LED lamp power supply.
Described electric current amplification module comprises: fet; The grid of fet is the control end of electric current amplification module; The source electrode of fet is the negative feedback point; This source electrode links to each other with an end of current-limiting resistance, and the other end of current-limiting resistance is the earth terminal of electric current amplification module, and the drain electrode of fet is the output of electric current amplification module; Described electronic switch module is a triode, and the base stage of triode is the control end of electronic switch module, and the current collection of triode is the output of electronic switch module very, and the emission of triode is the earth terminal of electronic switch module very.
The invention has the beneficial effects as follows: electronic switch module among the present invention and electric current amplification module cooperatively interact; Make the vibration output of electric current amplification module, the average current substantially constant of LED is flow through in intermittently conducting of LED; Realized the purpose of constant current control, the useful life of having improved the LED lamp greatly.In addition, the drive circuit has here adopted by discrete devices such as FET and triodes and has constituted, and greatly reduces cost; And taking up room of this drive circuit is less, does not need too big installing space, installs very convenient.
Description of drawings
Fig. 1 is the structural representation that has adopted the LED lamp controller of drive circuit according to the invention.
Embodiment
Below in conjunction with accompanying drawing, describe specific embodiments of the present invention in detail.
As shown in Figure 1; A kind of LED lamp controller that has adopted drive circuit according to the invention; The drive circuit that has comprised three covers LED lamps of the present invention in this controller, this three covers drive circuit is respectively applied for and drives red, blue, green LED lamp, red LED lamp by four strings three and the red LED lamp string constitute; The blue led lamp is made up of four strings three blue led lamp string also, and green LED lamp is made up of four strings three green LED lamp string also; Wherein, Drive the drive circuit of blue led lamp; Comprise: by FET be the electric current amplification module that constitutes of metal-oxide-semiconductor M1, current-limiting resistance R5 and input resistance RA, the electronic switch module and the two-way DC power supply that constitute by small-power high-frequency triode Q1; In this two-way DC power supply; One the tunnel is the LED lamp power supply of giving the 15V of red, blue, green three paths of LEDs lamps power supply; Another road is the working power to the 5V of microprocessor U1 and memory U2 power supply; This two-way DC power supply altogether, the grid of said FET M1 links to each other through the pin PA5 on the I/O port of input resistance RA and the microprocessor U1 that produces signal source as the control end of electric current amplification module, the drain electrode of FET M1 is passed through the blue led lamp as the output of electric current amplification module and is linked to each other with the positive pole of LED lamp power supply; The source electrode of FET M1 is through a current-limiting resistance R5 ground connection; The collector electrode of small-power high-frequency triode Q1 links to each other with the grid of FET M1 as the output of electronic switch module, and the base stage of small-power high-frequency triode Q1 is that the negative feedback point of electric current amplification module links to each other the grounded emitter of small-power high-frequency triode Q1 as the control end of electronic switch module and the source electrode of FET M1.
Above-mentioned drive circuit also includes: the output control module that is made up of FET M4 and control input resistance R4; The source electrode of said FET M1 links to each other with the emitter of small-power high-frequency triode Q1 afterwards, links to each other with the drain electrode of FET M4 through a current-limiting resistance R5; The grid of FET M4 links to each other the source ground of FET M4 through the pin PA4 on the I/O port of control input resistance R4 and microprocessor U1.
As everyone knows, when frequency of oscillation surpasses 75 hertz, people's eyes are with regard to imperceptible flicker.This drive circuit just is being based on this point.When lighting the blue led lamp, microprocessor U1 is set to high level with pin PA4 and PA5, makes FET M4 conducting; And FET M1 is under the effect of small-power high-frequency triode Q1; Intermittent conduction makes the output of FET M1 form vibration, and frequency of oscillation is far longer than 75 hertz; Intermittently conducting of blue led, the useful life of having improved the LED lamp greatly.
The drive circuit that drives red LED lamp and green LED lamp is just the same with the structure and the operation principle of the drive circuit that drives the blue led lamp, repeats no more at this.
Claims (3)
1.LED the drive circuit of lamp; Comprise: the electric current amplification module, the control end of electric current amplification module links to each other with signal source through input resistance, and the output of electric current amplification module links to each other with LED lamp positive source through the LED lamp; It is characterized in that; The drive circuit of this LED lamp also comprises electronic switch module, and the output of electronic switch module links to each other with the control end of electric current amplification module, and the control end of electronic switch module links to each other with the negative feedback point of electric current amplification module; The earth terminal of electric current amplification module and electronic switch module all links to each other with the negative pole of LED lamp power supply.
2. the drive circuit of LED lamp according to claim 1; It is characterized in that; The drive circuit of described LED lamp also comprises: output control module after the earth terminal of described electric current amplification module and electronic switch module links to each other, links to each other through the negative pole of output control module with LED lamp power supply.
3. the drive circuit of LED lamp according to claim 1 and 2; It is characterized in that described electric current amplification module comprises: fet, the grid of fet are the control end of electric current amplification module; The source electrode of fet is the negative feedback point; This source electrode links to each other with an end of current-limiting resistance, and the other end of current-limiting resistance is the earth terminal of electric current amplification module, and the drain electrode of fet is the output of electric current amplification module; Described electronic switch module is a triode, and the base stage of triode is the control end of electronic switch module, and the current collection of triode is the output of electronic switch module very, and the emission of triode is the earth terminal of electronic switch module very.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110147721 CN102333402B (en) | 2011-06-02 | 2011-06-02 | Drive circuit of LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110147721 CN102333402B (en) | 2011-06-02 | 2011-06-02 | Drive circuit of LED lamp |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102333402A true CN102333402A (en) | 2012-01-25 |
| CN102333402B CN102333402B (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110147721 Active CN102333402B (en) | 2011-06-02 | 2011-06-02 | Drive circuit of LED lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102333402B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114267305A (en) * | 2021-12-31 | 2022-04-01 | 广东美的厨房电器制造有限公司 | Integrated control chip and electronic device |
| WO2022095664A1 (en) * | 2020-11-03 | 2022-05-12 | 北京显芯科技有限公司 | Led drive system and electronic device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2826895Y (en) * | 2005-09-16 | 2006-10-11 | 谭泽民 | Constant current driver control circuit of color-changing LED lamp |
| CN201269446Y (en) * | 2008-09-03 | 2009-07-08 | 林原 | Constant-current lamp strip apparatus |
-
2011
- 2011-06-02 CN CN 201110147721 patent/CN102333402B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2826895Y (en) * | 2005-09-16 | 2006-10-11 | 谭泽民 | Constant current driver control circuit of color-changing LED lamp |
| CN201269446Y (en) * | 2008-09-03 | 2009-07-08 | 林原 | Constant-current lamp strip apparatus |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022095664A1 (en) * | 2020-11-03 | 2022-05-12 | 北京显芯科技有限公司 | Led drive system and electronic device |
| CN114267305A (en) * | 2021-12-31 | 2022-04-01 | 广东美的厨房电器制造有限公司 | Integrated control chip and electronic device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102333402B (en) | 2013-03-13 |
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Owner name: SUZHOU RUITENG LIGHTING TECHNOLOGY CO., LTD. Free format text: FORMER NAME: ZHANGJIAGANG RADIANT TECHNOLOGY CO.,LTD. |
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| CP03 | Change of name, title or address |
Address after: 215612, Shuanglong Village, Shuanglong Village, Fenghuang Town, Zhangjiagang, Jiangsu, Suzhou Patentee after: SUZHOU RADIANT LIGHTING TECHNOLOGY CO., LTD. Address before: Zhangjiagang City, the town of Phoenix Valley Village in Suzhou City, Jiangsu province 215600 Patentee before: Zhangjiagang Radiant Technology Co.,Ltd. |