CN102333402B - Drive circuit of LED lamp - Google Patents
Drive circuit of LED lamp Download PDFInfo
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- CN102333402B CN102333402B CN 201110147721 CN201110147721A CN102333402B CN 102333402 B CN102333402 B CN 102333402B CN 201110147721 CN201110147721 CN 201110147721 CN 201110147721 A CN201110147721 A CN 201110147721A CN 102333402 B CN102333402 B CN 102333402B
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- current amplification
- led lamp
- electronic switch
- amplification module
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Abstract
The invention discloses a controller for an LED lamp, wherein the controller enables an average current passing through the LED to be basically constant when the LED lamp is lightened. The controller comprises a microprocessor, an output control module and three LED lamp drive circuits. The control terminal of the output control module is connected with the microprocessor. Each LED lamp drive circuit consists of a current amplification module and an electronic switch module. The control terminal of the current amplification module is connected with a signal source through an input resistance. The output terminal of the current amplification module is connected with a power supply anode of an LED lamp through the LED lamp. The output terminal of the electronic switch module is connected with the control terminal of the current amplification module. The control terminal of the electronic switch module is connected with the negative feedback point of the current amplification module. After being connected together, the earth terminals of the current amplification module and the electronic switch module are both connected with the cathode of the power supply of the LED lamp. According to the invention, the oscillation output of the current amplification module is realized and the LED is conductive intermittently. Thus, the average current passing through the LED is ensured to be basically constant. The 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 the string by a plurality of LED, the LED lamp controller that also consists of.
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, so that the pressure drop at LED two ends changes, 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: provide a kind of in lightening LED lamp so that flow through the substantially invariable LED lamp controller of the average current of LED.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the LED lamp controller, comprise: microprocessor, output control module and three paths of LEDs lamp drive circuits, the control end of output control module links to each other with microprocessor, every paths of LEDs lamp drive circuit comprises: the electric current amplification module, electronic switch module, the control end of electric current amplification module links to each other with signal source by input resistance, the output of electric current amplification module links to each other with LED lamp positive source by the LED lamp, the output of electronic switch module links to each other with the control end of electric current amplification module, the control end of electronic switch module links to each other with the negative feedback point of electric current amplification module, after the earth terminal of electric current amplification module and electronic switch module links to each other, link to each other by the negative pole of output control module with LED lamp power supply;
Described electric current amplification module comprises: fet, the grid of fet is that the control end of electric current amplification module links to each other by the pin of input resistance with the I/O port of microprocessor, the source electrode of fet is the negative feedback point, this source electrode links to each other with an end of current-limiting resistance, 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 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;
Described output control module is made of fet and control inputs resistance, the grid of this field effect transistor links to each other with a pin of the I/O port of microprocessor by control inputs resistance, the earth terminal of electronic switch module and the earth terminal of electric current amplification module link to each other in the source ground of field effect transistor, the drain electrode of this field effect transistor and three paths of LEDs lamp drive circuits.
The invention has the beneficial effects as follows: each the paths of LEDs lamp drive circuit among the present invention cooperatively interacts by electronic switch module and electric current amplification module, so that the vibration of electric current amplification module output, intermittently conducting of LED, flow through the average current substantially constant of LED, realized the purpose of constant current control, the useful life of greatly having improved the LED lamp.In addition, the drive circuit has here adopted by discrete devices such as field effect transistor and triodes and has consisted of, and greatly reduces cost; And taking up room of this drive circuit is less, does not need too large installing space, installs very convenient.
Description of drawings
Fig. 1 is the structural representation that has adopted the LED lamp controller of drive circuit of the present 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 of the present 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 to drive red, blue, green LED lamp, red LED lamp is made of four strings three red LED lamp string also, the blue led lamp is made of four strings three blue led lamp string also, and green LED lamp is made of four strings three green LED lamp string also; Wherein, drive the drive circuit of blue led lamp, comprise: be metal-oxide-semiconductor M1 by field effect transistor, the electric current amplification module that current-limiting resistance R5 and input resistance RA consist of, the electronic switch module and the two-way DC power supply that are consisted of by small-power high-frequency triode Q1, in this two-way DC power supply, one the tunnel is to red, blue, the LED lamp power supply of the 15V of 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 described field effect transistor M1 links to each other by 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 field effect transistor M1 links to each other with the positive pole of LED lamp power supply by the blue led lamp as the output of electric current amplification module, the source electrode of field effect transistor M1 is by 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 field effect transistor M1 as the output of electronic switch module, 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 field effect transistor M1.
Above-mentioned drive circuit also includes: the output control module that is made of field effect transistor M4 and control inputs resistance R 4, the source electrode of described field effect transistor 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 field effect transistor M4 by a current-limiting resistance R5, the grid of field effect transistor M4 links to each other the source ground of field effect transistor M4 by the pin PA4 on the I/O port of control inputs resistance R 4 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, so that field effect transistor M4 conducting, and field effect transistor M1 is under the effect of small-power high-frequency triode Q1, intermittent conduction, so that the output of field effect transistor M1 forms vibration, frequency of oscillation is far longer than 75 hertz, intermittently conducting of blue led, the useful life of greatly having improved the LED lamp.
The drive circuit that drives red LED lamp and green LED lamp is just the same with structure and the operation principle of the drive circuit that drives the blue led lamp, does not repeat them here.
Claims (1)
1.LED lamp controller, comprise: microprocessor, it is characterized in that, described controller also comprises: output control module and three paths of LEDs lamp drive circuits, the control end of output control module links to each other with microprocessor, every paths of LEDs lamp drive circuit comprises: the electric current amplification module, electronic switch module, the control end of electric current amplification module links to each other by the pin of input resistance with the I/O port of the microprocessor that produces signal source, the output of electric current amplification module links to each other with LED lamp positive source by the LED lamp, the output of electronic switch module links to each other with the control end of electric current amplification module, 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 links to each other by the negative pole of output control module with LED lamp power supply with after the earth terminal of electronic switch module links to each other;
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, 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 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;
Described output control module is made of fet and control inputs resistance, the grid of this field effect transistor links to each other with a corresponding pin of the I/O port of microprocessor by control inputs resistance, the earth terminal of electronic switch module and the earth terminal of electric current amplification module link to each other in the source ground of field effect transistor, the drain electrode of this field effect transistor and three paths of LEDs lamp drive circuits.
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 CN102333402A (en) | 2012-01-25 |
| CN102333402B true CN102333402B (en) | 2013-03-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110147721 Active CN102333402B (en) | 2011-06-02 | 2011-06-02 | Drive circuit of LED lamp |
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| CN (1) | CN102333402B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112689366B (en) * | 2020-11-03 | 2021-09-07 | 北京显芯科技有限公司 | LED driving system and electronic equipment |
| 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 |
Family Cites Families (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 |
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| CN102333402A (en) | 2012-01-25 |
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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. |