CN202634794U - Automobile dimming LED reading lamp - Google Patents
Automobile dimming LED reading lamp Download PDFInfo
- Publication number
- CN202634794U CN202634794U CN 201220203016 CN201220203016U CN202634794U CN 202634794 U CN202634794 U CN 202634794U CN 201220203016 CN201220203016 CN 201220203016 CN 201220203016 U CN201220203016 U CN 201220203016U CN 202634794 U CN202634794 U CN 202634794U
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- reading lamp
- chip microcomputer
- automobile
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Abstract
The utility model relates to an application circuit, and especially relates to an automobile dimming LED (Light Emitting Diode) reading lamp; wherein a power supply circuit and a button circuit of the application circuit are respectively connected to a single-chip microcomputer, the single-chip microcomputer is connected with a switching circuit, and the switching circuit is connected with a constant-current drive circuit. The automobile dimming LED reading lamp of the utility model outputs a PWM (Pulse Width Modulation) signal to control an LED lamp group through button control to the single-chip microcomputer, thereby realizing a dimming function of an automobile LED reading lamp. The automobile dimming LED reading lamp of the utility model has the advantages of no chromatogram deviation, high dimming accuracy, and no scintillation, thereby bringing conveniences to users.
Description
Technical field
The utility model relates to a kind of application circuit, is specifically related to the automobile light-modulating led drive circuit.
Background technology
The Halogen lamp LEDs of the two points of a lot of employings of automobile reading lamp in the past, not only brightness is low but also not energy-conservation.LED is a kind of energy-saving and environmental protection, long-life new type light source.LED is extensively adopted in the reading lamp of automobile recently.And existing automobile LED reading lamp is generally directly connected the LED lamp with current-limiting resistance, is connected with storage battery then, is not to adopt constant-current source to drive; Cause the color of light to change easily, poor stability, and do not possess dimming function; Both wasted energy, and brought influence for again user's eyesight.
Summary of the invention
The purpose of the utility model is to propose a kind of scheme of practicality, overcomes the unstable and nonadjustable shortcoming of existing automobile LED reading lamp brightness.
Existing automobile LED reading lamp brightness is non-adjustable, makes troubles to the user.The brightness of LED is almost directly proportional with its drive current, and what generally adopt is to change its drive current to carry out light modulation, can in degree of lightening, change its spectrum and colour temperature like this, and can produce the serious problems that constant-current source can't be worked.
The purpose of the utility model realizes through following approach: a kind of automobile light-modulating LED reading lamp, and the power circuit of this reading lamp, key circuit connect single-chip microcomputer respectively, and single-chip microcomputer connects switching circuit, and switching circuit connects constant current source driving circuit.
Further, described single-chip microcomputer is connected with clock circuit and reset circuit.
Further, described single-chip microcomputer model is 89S2051.
Further, described constant current source driving circuit model is LT3474.
The utility model automobile light-modulating LED reading lamp makes DC power supply into pulsed constant current supply, and the method for utilizing the button control single chip computer to change pulse duration changes its brightness.Thereby reach the purpose of automobile LED reading lamp adjustable brightness.The utlity model has following advantage:
1. can not produce any chromatogram skew.Because LED always works between full amplitude electric current and 0.
2. high light modulation accuracy is arranged.Because impulse waveform can reach very high precision through Single-chip Controlling fully, regulate so be easy to realize high accuracy.
3. even scintillation can not take place in light modulation in very large range yet.Because can not change the constant current source condition, more problems such as overheated can not take place.
Description of drawings
Below in conjunction with accompanying drawing the utility model is done further explain:
Fig. 1 is the utility model structure block diagram;
Fig. 2 is the utility model circuit diagram;
Among the figure, power circuit 1, single-chip microcomputer 2, key circuit 3, switching circuit 4, constant current source driving circuit 5, clock circuit 6, reset circuit 7.
Embodiment
As shown in Figure 1; The utility model automobile light-modulating LED reading lamp, power circuit 1, the key circuit 3 of this reading lamp connect single-chip microcomputer 2 respectively, and single-chip microcomputer 2 connects switching circuit 4; Switching circuit 4 connects constant current source driving circuit 5, and described single-chip microcomputer 2 is connected with clock circuit 6 and reset circuit 7.
As shown in Figure 2, power circuit 1, is obtained+5V voltage through C5 filtering after capacitor C 4 filtering are by three terminal integrated voltage stabilizer 7805 voltage stabilizings by vehicle power U0.
Single-chip microcomputer 2 minimum systems are made up of single-chip microcomputer IC1 (89S2051) and peripheral circuit.Wherein VCC (the 20th pin) forms power supply circuits with GND (the 10th pin); Its main purpose is power supply to single-chip minimum system to be provided.Clock circuit is made up of capacitor C 1, C2 and crystal oscillator Y1; A high postiive gain sign-changing amplifier that is used to constitute oscillator is arranged in the single-chip microcomputer sheet, and pin XTAL1 and XTAL2 are respectively the input and output sides of this amplifier.Reset circuit 7 is made up of C3, R1.Reset circuit 7 can make that miscellaneous part is in a definite initial condition in CPU and the system, and brings into operation from this state.
Switching circuit 4 is made up of FET Q1, and the source electrode of FET Q1 is connected to ground.The drain electrode of Q1 links to each other with the 3rd pin of IC2 (LT3474) through diode D1.The grid of FET Q1 links to each other with the 15th pin of single-chip microcomputer IC1.
The 2nd pin of constant current source driving circuit 5 (IC2) is connected with the 5th pin through inductance L 1; And be connected with the 7th pin; (IC2) the 3rd pin is connected to the drain electrode of FET Q1 through diode D1, and the 4th pin (IC2) is connected with the anodal U0 of battery feed, and the 5th pin connects anode to ground through the negative electrode of diode D2; The 6th pin is connected with diode D2 negative electrode through capacitor C 8, and the 7th pin connects capacitor C 7 to ground.The 8th pin is connected with ground, and the 9th pin is connected with ground through resistance R 2, and the 10th pin is connected with the anodal U0 of battery feed, and the 11st pin is connected with the 13rd pin, and the 12nd pin is connected with ground through capacitor C 6.The 14th pin is connected with the grid of FET Q1.
System principle:
The input power supply is provided for the 1st pin of IC3 by automobile storage battery,, offers the 20th pin of single-chip microcomputer IC1 through obtaining after the IC3 voltage stabilizing+direct voltage of 5V.The 1st pin of IC1 and external circuit are realized its reset function.The clock signal of IC1 is provided by the external quartz oscillator Y1 of the 4th, 5 pins.The external button of the 17th, 19 pins of IC1 carries out light modulation.When realizing that through programming button KEY1 presses, the duty ratio of the 15th pin of IC1 output square wave increases, thereby D1 brightness is increased.When button KEY2 pressed, the duty ratio of the 15th pin of IC1 output square wave reduced, thereby D1 brightness is reduced.Constant current source driving circuit is accomplished by IC2, and this chip has the current driving ability of 1A.The 9th pin outer meeting resistance R2 of IC2 produces the switching frequency of 500KHz, and the 4th pin and the 10th pin of IC2 provide power supply by storage battery.The pwm signal that single-chip microcomputer produces is through the 14th pin input of IC2, and the 3rd pin output constant-current driving signal of IC2 is to the anode of LED (D1).Its negative electrode connects the drain electrode of FET Q1, the source ground of Q1.Through adjusting the duty ratio of the grid pwm signal of importing Q1, can adjust the brightness of LED.
Claims (4)
1. automobile light-modulating LED reading lamp; It is characterized in that: the power circuit of this reading lamp (1), key circuit (3) connect single-chip microcomputer (2) respectively; Single-chip microcomputer (2) connects switching circuit (4), and switching circuit (4) connects constant current source driving circuit (5).
2. automobile light-modulating LED reading lamp as claimed in claim 1 is characterized in that: described single-chip microcomputer (2) is connected with clock circuit (6) and reset circuit (7).
3. according to claim 1 or claim 2 automobile light-modulating LED reading lamp, it is characterized in that: described single-chip microcomputer (2) model is 89S2051.
4. automobile light-modulating LED reading lamp as claimed in claim 1 is characterized in that: described constant current source driving circuit (5) model is LT3474.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220203016 CN202634794U (en) | 2012-05-08 | 2012-05-08 | Automobile dimming LED reading lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220203016 CN202634794U (en) | 2012-05-08 | 2012-05-08 | Automobile dimming LED reading lamp |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202634794U true CN202634794U (en) | 2012-12-26 |
Family
ID=47387927
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220203016 Expired - Fee Related CN202634794U (en) | 2012-05-08 | 2012-05-08 | Automobile dimming LED reading lamp |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202634794U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458590A (en) * | 2013-09-29 | 2013-12-18 | 奇瑞汽车股份有限公司 | Control circuit of automobile LED trim atmosphere lamp |
| CN108575031A (en) * | 2017-09-25 | 2018-09-25 | 常州星宇车灯股份有限公司 | A kind of interior reading lamp carrying out brightness regulation using capacitance draw runner |
-
2012
- 2012-05-08 CN CN 201220203016 patent/CN202634794U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103458590A (en) * | 2013-09-29 | 2013-12-18 | 奇瑞汽车股份有限公司 | Control circuit of automobile LED trim atmosphere lamp |
| CN103458590B (en) * | 2013-09-29 | 2015-09-23 | 奇瑞汽车股份有限公司 | A kind of control circuit of automobile LED trim atmosphere lamp |
| CN108575031A (en) * | 2017-09-25 | 2018-09-25 | 常州星宇车灯股份有限公司 | A kind of interior reading lamp carrying out brightness regulation using capacitance draw runner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121226 Termination date: 20130508 |