CN104754834A - Anti-interference LED pilot lamp drive circuit - Google Patents
Anti-interference LED pilot lamp drive circuit Download PDFInfo
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- CN104754834A CN104754834A CN201510158385.9A CN201510158385A CN104754834A CN 104754834 A CN104754834 A CN 104754834A CN 201510158385 A CN201510158385 A CN 201510158385A CN 104754834 A CN104754834 A CN 104754834A
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- drive circuit
- resistor
- resistance
- pilot lamp
- led pilot
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Abstract
The invention belongs to the field of drive circuit, discloses an anti-interference LED pilot lamp drive circuit and solves the problem that the LED pilot lamp is easily accidentally lighted or in dark light state under action of the drive circuit. The drive circuit comprises a resistor R1, an MOSFET (metal-oxide semiconductor field effect transistor), a capacitor C1, a resistor R2 and a resistor R3. One end of the resistor R1 is connected with a positive electrode of a power supply of a vehicle battery, and the other end of the resistor R1 is connected with an anode of the LED pilot lamp. A drain of the MOSFET is connected with a cathode of the LED pilot lamp, and a source of the MOSFET is connected with a negative electrode of the power supply of the vehicle battery. A grid of the MOSFET is simultaneously connected with one end of the capacitor C1, one end of the resistor R3 and one end of the resistor R2. The other end of the capacitor C1 and the other end of the resistor R3 are simultaneously connected with the negative electrode of the power supply of the vehicle battery. The other end of the resistor R2 is connected with a pin BR of a single-chip microcomputer. The anti-interference LED pilot lamp drive circuit is used for driving the LED pilot lamp.
Description
Technical field
The invention belongs to drive circuit field.
Background technology
Signal lamp many employings bulb on traditional automobile instrument, in recent years along with the raising of technical merit, many employing LED cold light sources are as signal lamp, as direction indicator lamp indicator light, fog-lamp warning light, stop lamp indicator light etc., and the MOSFET that adopts controls LED more in the drive circuit of LED, but use this drive circuit, LED light there will be to be lighted or dark bright state unexpectedly.
Summary of the invention
The object of the invention is easily make LED light surprisingly light to solve LED light drive circuit or in the problem of dark bright state, the invention provides a kind of jamproof LED light drive circuit.
Jamproof LED light drive circuit of the present invention,
Described drive circuit comprises resistance R1, MOSFET pipe, electric capacity C1 and resistance R2, and described drive circuit also comprises resistance R3;
One end of resistance R1 connects the positive source of Vehicular battery, the other end of resistance R1 connects the anode of LED light PL1, the drain electrode of MOSFET pipe is connected with the negative electrode of LED light PL1, the source electrode of MOSFET pipe connects the power cathode of Vehicular battery, the grid of MOSFET pipe is connected with one end of one end of electric capacity C1, resistance R3 and one end of resistance R2 simultaneously, the other end of electric capacity C1 and the other end of resistance R3 connect the power cathode of Vehicular battery simultaneously, and the other end of resistance R2 is for connecting the control pin BR of single-chip microcomputer.
Through test of many times checking,
During tradition employing MOSFET pipe driving LED indicator light, when product entrucking in enormous quantities, the LED light of individual product there will be to be lighted or dark bright state unexpectedly, and this problem can not obtain basic solution always.Present inventor verifies through long-term theory analysis and test of many times, determines to cause the basic reason of this problem to be to control the impact that pin is easily subject to stored charge.MOSFET management and control portvoltage sensitivity and its control electric current are in nA level, when Single-chip Controlling pin is high-impedance state, (this situation easily occurs when Single Chip Microcomputer (SCM) program is run and flown, now Single-chip Controlling pin output can be high-impedance state), the grid of MOSFET pipe can continuous stored charge, pressure reduction is produced over the ground after this stored charge reaches some, make MOSFET pipe can be in the state of conducting, LED light PL1 will be lit or occur secretly bright state.The present invention adopts series resistance R3 between the grid and power supply ground of MOSFET pipe, realizes the release to stored charge, and at this moment MOSFET pipe operation can not be subject to stored charge impact, completely eliminates the generation of the problems referred to above.
Present invention employs very simple technological means, and cost does not almost increase, and lights or be the problem of dark bright state with regard to solving accident that is that traditional LED light drive circuit exists and that be not solved always.
Accompanying drawing explanation
Fig. 1 is the circuit theory schematic diagram of the jamproof LED light drive circuit described in embodiment one.
Embodiment
Embodiment one: composition graphs 1 illustrates present embodiment, the jamproof LED light drive circuit described in present embodiment, described drive circuit comprises resistance R1, MOSFET pipe, electric capacity C1 and resistance R2, and described drive circuit also comprises resistance R3;
One end of resistance R1 connects the positive source of Vehicular battery, the other end of resistance R1 connects the anode of LED light PL1, the drain electrode of MOSFET pipe is connected with the negative electrode of LED light PL1, the source electrode of MOSFET pipe connects the power cathode of Vehicular battery, the grid of MOSFET pipe is connected with one end of one end of electric capacity C1, resistance R3 and one end of resistance R2 simultaneously, the other end of electric capacity C1 and the other end of resistance R3 connect the power cathode of Vehicular battery simultaneously, and the other end of resistance R2 is for connecting the control pin BR of single-chip microcomputer.
In present embodiment, when Single-chip Controlling pin BR is high-impedance state, MOSFET control end easily carries out switching manipulation by stored charge affects, even if but have stored charge generation also can be discharged by resistance R3 after adding resistance R3.At this moment MOSFET operation can not be subject to stored charge impact.
Claims (1)
1. jamproof LED light drive circuit, described drive circuit comprises resistance R1, MOSFET pipe, electric capacity C1 and resistance R2, and it is characterized in that, described drive circuit also comprises resistance R3;
One end of resistance R1 connects the positive source of Vehicular battery, the other end of resistance R1 connects the anode of LED light PL1, the drain electrode of MOSFET pipe is connected with the negative electrode of LED light PL1, the source electrode of MOSFET pipe connects the power cathode of Vehicular battery, the grid of MOSFET pipe is connected with one end of one end of electric capacity C1, resistance R3 and one end of resistance R2 simultaneously, the other end of electric capacity C1 and the other end of resistance R3 connect the power cathode of Vehicular battery simultaneously, and the other end of resistance R2 is for connecting the BR pin of single-chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510158385.9A CN104754834A (en) | 2015-04-03 | 2015-04-03 | Anti-interference LED pilot lamp drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510158385.9A CN104754834A (en) | 2015-04-03 | 2015-04-03 | Anti-interference LED pilot lamp drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104754834A true CN104754834A (en) | 2015-07-01 |
Family
ID=53593758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510158385.9A Pending CN104754834A (en) | 2015-04-03 | 2015-04-03 | Anti-interference LED pilot lamp drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104754834A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6392936A (en) * | 1986-10-08 | 1988-04-23 | Canon Inc | Stroboscopic device |
| CN201804534U (en) * | 2010-09-04 | 2011-04-20 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) drive circuit and television having same |
| CN104405557A (en) * | 2014-12-05 | 2015-03-11 | 重庆瑜欣平瑞电子有限公司 | Ignition monitoring circuit structure of general gasoline engine igniter |
| CN204442809U (en) * | 2015-04-03 | 2015-07-01 | 航天科技控股集团股份有限公司 | Jamproof LED light drive circuit |
-
2015
- 2015-04-03 CN CN201510158385.9A patent/CN104754834A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6392936A (en) * | 1986-10-08 | 1988-04-23 | Canon Inc | Stroboscopic device |
| CN201804534U (en) * | 2010-09-04 | 2011-04-20 | 青岛海信电器股份有限公司 | Light-emitting diode (LED) drive circuit and television having same |
| CN104405557A (en) * | 2014-12-05 | 2015-03-11 | 重庆瑜欣平瑞电子有限公司 | Ignition monitoring circuit structure of general gasoline engine igniter |
| CN204442809U (en) * | 2015-04-03 | 2015-07-01 | 航天科技控股集团股份有限公司 | Jamproof LED light drive circuit |
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Legal Events
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20150701 |
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| WD01 | Invention patent application deemed withdrawn after publication |