CN104768268A - LED signal lamp and constant-current driving circuit thereof - Google Patents
LED signal lamp and constant-current driving circuit thereof Download PDFInfo
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- CN104768268A CN104768268A CN201410002171.8A CN201410002171A CN104768268A CN 104768268 A CN104768268 A CN 104768268A CN 201410002171 A CN201410002171 A CN 201410002171A CN 104768268 A CN104768268 A CN 104768268A
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Abstract
A constant-current driving circuit for LED signal lamps is connected with an LED lamp group, and comprises a constant-current driving module provided with more than two constant-current output ends. The constant-current driving circuit further comprises a dimming module connected with the constant-current driving module. The diming module outputs at least two levels of dimming signals to the constant-current driving module to adjust the current output by the constant-current driving module from the constant-current output ends. An LED signal lamp is further disclosed. The constant-current driving circuit of the invention has a dimming function and can meet the needs of different distances.
Description
Technical field
The present invention relates to field of electronic illumination, particularly relate to a kind of LED signal lamp and constant-current drive circuit thereof.
Background technology
Signal lamp is in order to a kind of important tool strengthening control of traffic and road, reduce the generation of traffic accident, improve road occupation efficiency, improve traffic.For mine locomotive, often need operation in tunnel in evening, higher to the requirement of signal lamp.LED, as the chief component of signal lamp, needs special drive circuit to provide constant electric current for it during work.
But traditional constant-current drive circuit is not special designs for mine locomotive supplied character, the luminosity of LED is nearly all fixing, and remote signal lamp possibly cannot by clear identification.
Summary of the invention
Based on this, be necessary to provide a kind of constant-current drive circuit that can adjust the LED signal lamp of brightness for locomotive power supply characteristic.
In addition, a kind of signal lamp is also provided.
A kind of constant-current drive circuit of LED signal lamp, be connected with LED group, comprise the constant-current driven module with two or more constant current output end, also comprise the light-adjusting module be connected with described constant-current driven module, described light-adjusting module exports the electric current that at least two-stage dim signal to described constant-current driven module exports from constant current output end to regulate described constant-current driven module.
Wherein in an embodiment, described constant-current driven module comprises the constant current chip according to pulse-width signal determination output current size, and described light-adjusting module comprises the micro-control unit of the pulse-width signal of exportable different duty.
Wherein in an embodiment, the model of described constant current chip is MBI1816.
Wherein in an embodiment, described micro-control unit comprises micro-chip processor, the first resistance that model is 8052; The earth terminal ground connection of described micro-chip processor, the pulse-width signal output of described micro-chip processor inputs pulse-width signal input with the pulse-width signal of described constant current chip and is connected, the reset terminal of described micro-chip processor is connected with the power source supply end of described constant current chip together by the power source supply end of described first resistance, described micro-chip processor, described micro-control unit also comprises the crystal oscillator for providing work clock, and described crystal oscillator is connected to the input of system crystal oscillating circuit, the output of described micro-chip processor.
Wherein in an embodiment, described light-adjusting module also comprises selected cell, first stiff end of described selected cell is connected with the power source supply end of described constant current chip by the second resistance, and the selecting side of described selected cell is connected with the pulse width control end of described micro-chip processor.
Wherein in an embodiment, described selected cell is single-pole single-throw switch (SPST), and the moved end of described single-pole single-throw switch (SPST) is the selecting side of described selected cell, and the not moved end of described single-pole single-throw switch (SPST) is the first stiff end of described selected cell.
Wherein in an embodiment, described micro-control unit also comprises the 3rd resistance, and the second stiff end of described selected cell is connected with the power source supply end of described constant current chip together by described 3rd resistance.
Wherein in an embodiment, described selected cell is single-pole double-throw switch (SPDT), the moved end of described single-pole double-throw switch (SPDT) is the selecting side of described selected cell, described single-pole double-throw switch (SPDT) first not moved end be the first stiff end of described selected cell, described single-pole double-throw switch (SPDT) second not moved end be the second stiff end of described selected cell.
Wherein in an embodiment, the constant-current drive circuit of described LED signal lamp also comprises the divider resistance of the light-emitting diodes tube anode being connected on described LED Zu Zhongmei road end.
A kind of LED signal lamp, comprise LED group, also comprise the constant-current drive circuit of above-mentioned LED signal lamp, described LED group is connected with the constant current output end of described main control chip.
Above-mentioned LED signal lamp and constant-current drive circuit thereof export by described light-adjusting module electric current that at least two-stage dim signal to described constant-current driven module regulates described constant-current driven module to export from constant current output end thus the luminosity of light-emitting diode control LED group, make the brightness of LED group adjustable, be applicable to the needs of different distance.
Accompanying drawing explanation
Fig. 1 is the constant-current drive circuit module map of the LED signal lamp of an embodiment;
Fig. 2 is the constant-current drive circuit schematic diagram of the LED signal lamp of an embodiment.
Embodiment
As shown in Figure 1, be the constant-current drive circuit module map of LED signal lamp of an embodiment.
The constant-current drive circuit 20 of this LED signal lamp is connected with LED group 10, comprises the constant-current driven module 210 with two or more constant current output end and the light-adjusting module 220 be connected with constant-current driven module 210.Light-adjusting module 220 exports the electric current that at least two-stage dim signal exports from constant current output end to constant-current driven module 210 to regulate constant-current driven module 210.
Wherein, constant-current driven module 210 is according to the constant current chip 211 of pulse-width signal determination output current size, and light-adjusting module 220 comprises the micro-control unit 221 of the pulse-width signal of exportable different duty and the selected cell 222 for selecting to export dim signal not at the same level.
As shown in Figure 2, be the constant-current drive circuit schematic diagram of LED signal lamp of an embodiment.
The constant-current drive circuit 40 of this LED signal lamp comprises the constant-current driven module 410 with 16 constant current output ends and the light-adjusting module 420 be connected with constant-current driven module 410.Light-adjusting module 420 exports the electric current that three grades of dim signals export from constant current output end to constant-current driven module 410 to regulate constant-current driven module 410.
Wherein, constant-current driven module 410 is according to the constant current chip U1 of pulse-width signal determination output current size, and light-adjusting module 420 comprises the micro-control unit 421 of the pulse-width signal of exportable different duty and the selected cell 422 for selecting to export dim signal not at the same level.In the present embodiment, the model of constant current chip U1 is MBI1816.
Micro-control unit 421 comprises micro-chip processor U2, the first resistance R1, the second resistance R2, the 3rd resistance R3.
Micro-chip processor U2 to be model be 8052 programmable chip.The earth terminal GND ground connection of micro-chip processor U2, the pulse-width signal output SDO of micro-chip processor U2 and the pulse-width signal input of micro flow chip U1
connect, the reset terminal RST of micro-chip processor U2 is connected with the power source supply end VDD of constant current chip U1 by the power source supply end VCC of the 3rd resistance R3, micro-chip processor U2 by the second stiff end of the second resistance R2, selected cell 422 together by the first stiff end of the first resistance R1, selected cell 422.The selecting side of selected cell 422 is connected with the serial ports outputting communication end RSO of micro-chip processor U2.
In the present embodiment, selected cell 421 is a single-pole double-throw switch (SPDT) K1.The moved end of single-pole double-throw switch (SPDT) K1 is the selecting side of selected cell 221, single-pole double-throw switch (SPDT) K1 first not moved end be the first stiff end of selected cell 421, single-pole double-throw switch (SPDT) K1 second not moved end be the second stiff end of selected cell 421.
Micro-chip processor U2 is by program control, acquiescence light modulation 50%(output current 30mA), now single-pole double-throw switch (SPDT) K1 mediates, namely namely the moved end of single-pole double-throw switch (SPDT) K1 both not with first not moved end is connected and also exports less than light modulation when moved end is not connected with second.
When single-pole double-throw switch (SPDT) K1 moved end with its first moved end is not connected time, light modulation exports 100%(output current 60mA); When single-pole double-throw switch (SPDT) K1 moved end with its second moved end is not connected time, light modulation exports 25%(output current 15mA).The essence of this light modulation i.e. the pulse-width signal output SDO of micro-chip processor U2 export the pwm signal of different duty to the pulse-width signal input OE of main control chip U1.
Light modulation exports percentage and sets primarily of micro-chip processor U2.In the present embodiment, three grades of outputs are respectively 100%, 50%, 25%, in other embodiments, and can by being set as any non-standard output signal to micro-chip processor U2 programming.
Be appreciated that single-pole double-throw switch (SPDT) K1 can also use single-pole single-throw switch (SPST), SP3T switch to replace, then exported by program control light modulation.Be appreciated that in other embodiments, other modes can also be adopted to coordinate micro-chip processor U2 to control light modulation and export, as relay etc., and be not limited to the mode that the present embodiment provides.
In constant-current driven module 410 in the constant-current drive circuit 40 of LED signal lamp, the peripheral circuit of constant current chip U1 comprises the 4th resistance R4, the 5th resistance R5, voltage stabilizing didoe D1.
Constant current chip U1 has 16 the constant current output ends be connected with LED signal lamp group 30
~
the quantity of the LED 1 ~ LED32 in LED signal lamp group 30 is variable, as long as the ceiling voltage needed for the light-emitting diode be chained together is less than input voltage.In addition, in order to reduce the caloric value of circuit, each constant current output end riches all the way optical diode anode connected respectively divider resistance R6 ~ R21, such as LED9 series resistance R6, LED32 series resistance R21 in LED group 30.The resistance R of the divider resistance on each road is determined by following formula: R=(V-V
1-V
2)/Iled.Wherein V is input voltage (i.e. the voltage of VCC), V
1the voltage sum that the light-emitting diode of all series windings in this paths of LEDs signal lamp group normally works required, V
2for the output end voltage of constant current chip U1, Iled is that in this paths of LEDs signal lamp group, all light-emitting diodes normally work required electric current.
The current range of each constant current output end of constant current chip U1 is 5mA ~ 60mA, and namely maximum current is 60mA.The operating voltage of constant current chip U1 is 5V, but its output voltage that can bear can reach 17V.In order to ensure the reliability of product, constant current chip U1 also has overheat protective function.When circuit temperature is more than 165 DEG C, overheat protective function can the output of automatic close current.
The power source supply end VDD of constant current chip U1 is connected with input power VCC by the 4th resistance R4, and the plus earth of voltage stabilizing didoe D1, the negative electrode of voltage stabilizing didoe D1 is connected with the power source supply end VDD of constant current chip U1.The outer meeting resistance input R-EXT of constant current chip U1 is by the 5th resistance R5 ground connection together with the earth terminal GND of main control chip U1.
The main effect of 4th resistance R4 is current limliting, its resistance R
3by formula R
4=(V-5.1)/Idd determines, wherein V is input voltage (i.e. the voltage of VCC), and Idd is that main control chip U1 normally works required electric current, generally gets 6mA.Voltage stabilizing didoe D1 is 5.1V voltage-stabiliser tube.
The drive current Iout of light-emitting diode is by formula Iout=(V
3/ R
5) × 59 are determined, wherein V
3be the voltage at the 5th resistance R5 two ends, generally get 1.24V.R
5it is the resistance of the 5th resistance R5.
Be appreciated that in other embodiments, constant current chip U1 can also replace with the chip that other functions are similar respectively with micro-chip processor U2.
In the present embodiment, the constant-current driven module 410 in the constant-current drive circuit 40 of this LED signal lamp also comprises the first electric capacity C1 and the second electric capacity C2 for preventing input voltage mutation.First electric capacity C1 is connected in parallel on the two ends of voltage stabilizing didoe D1, and the positive pole of the second electric capacity C2 is connected with input power VCC, the minus earth of the second electric capacity C2.Second electric capacity C2 is electrochemical capacitor.
In the present embodiment, the light-adjusting module 420 in the constant-current drive circuit 40 of this LED signal lamp also comprises the crystal oscillator Y1 for providing work clock.Crystal oscillator Y1 is connected to system crystal oscillating circuit input XI, the output XO of micro-chip processor U2.
A kind of LED signal lamp, comprises the constant-current drive circuit of LED group and above-mentioned LED signal lamp.
The operation principle of circuit is described with the circuit diagram shown in Fig. 2 below.
During normal work, the moved end of single-pole double-throw switch (SPDT) K1 with its first not moved end be connected, now the output current of main control chip U1 is 60mA, and the luminosity of LED group reaches the highest, is applicable to the place of needs remote indication signal; When LED group only need closely index signal time, luminosity is too high on the contrary can be dazzling, at this moment can by regulate the moved end of single-pole double-throw switch (SPDT) K1 with second not moved end be connected or make the moved end of single-pole double-throw switch (SPDT) K1 be suspended from centre, the output current of main control chip U1 just can correspondingly diminish, and the luminosity of LED group also can correspondingly step-down.
The above embodiment only have expressed several execution mode of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (10)
1. the constant-current drive circuit of a LED signal lamp, be connected with LED group, comprise the constant-current driven module with two or more constant current output end, it is characterized in that, also comprise the light-adjusting module be connected with described constant-current driven module, described light-adjusting module exports the electric current that at least two-stage dim signal to described constant-current driven module exports from constant current output end to regulate described constant-current driven module.
2. the constant-current drive circuit of LED signal lamp according to claim 1, it is characterized in that, described constant-current driven module comprises the constant current chip according to pulse-width signal determination output current size, and described light-adjusting module comprises the micro-control unit of the pulse-width signal of exportable different duty.
3. the constant-current drive circuit of LED signal lamp according to claim 2, is characterized in that, the model of described constant current chip is MBI1816.
4. the constant-current drive circuit of LED signal lamp according to claim 3, is characterized in that, described micro-control unit comprises micro-chip processor, the first resistance that model is 8052;
The earth terminal ground connection of described micro-chip processor, the pulse-width signal output of described micro-chip processor is connected with the pulse-width signal input of described constant current chip, the reset terminal of described micro-chip processor is connected with the power source supply end of described constant current chip together by the power source supply end of described first resistance, described micro-chip processor, described micro-control unit also comprises the crystal oscillator for providing work clock, and described crystal oscillator is connected to the input of system crystal oscillating circuit, the output of described micro-chip processor.
5. the constant-current drive circuit of LED signal lamp according to claim 4, it is characterized in that, described light-adjusting module also comprises selected cell, first stiff end of described selected cell is connected with the power source supply end of described constant current chip by the second resistance, and the selecting side of described selected cell is connected with the pulse width control end of described micro-chip processor.
6. the constant-current drive circuit of LED signal lamp according to claim 5, it is characterized in that, described selected cell is single-pole single-throw switch (SPST), the moved end of described single-pole single-throw switch (SPST) is the selecting side of described selected cell, and the not moved end of described single-pole single-throw switch (SPST) is the first stiff end of described selected cell.
7. the constant-current drive circuit of LED signal lamp according to claim 5, it is characterized in that, described micro-control unit also comprises the 3rd resistance, and the second stiff end of described selected cell is connected with the power source supply end of described constant current chip together by described 3rd resistance.
8. the constant-current drive circuit of LED signal lamp according to claim 7, it is characterized in that, described selected cell is single-pole double-throw switch (SPDT), the moved end of described single-pole double-throw switch (SPDT) is the selecting side of described selected cell, described single-pole double-throw switch (SPDT) first not moved end be the first stiff end of described selected cell, described single-pole double-throw switch (SPDT) second not moved end be the second stiff end of described selected cell.
9. the constant-current drive circuit of LED signal lamp according to claim 1, is characterized in that, also comprises the divider resistance of the light-emitting diodes tube anode being connected on described LED Zu Zhongmei road end.
10. a LED signal lamp, comprises LED group, it is characterized in that, also comprises the constant-current drive circuit of the LED signal lamp as described in any one of claim 1 ~ 9, and described LED group is connected with the constant current output end of described main control chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410002171.8A CN104768268A (en) | 2014-01-02 | 2014-01-02 | LED signal lamp and constant-current driving circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410002171.8A CN104768268A (en) | 2014-01-02 | 2014-01-02 | LED signal lamp and constant-current driving circuit thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116347706A (en) * | 2023-04-05 | 2023-06-27 | 杭州方千科技有限公司 | Traffic signal lamp power supply and control method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956937A (en) * | 2010-09-26 | 2011-01-26 | 重庆邦桥科技有限公司 | Color temperature adjustable light emitting diode (LED) flat lamp for sickroom |
| CN102595722A (en) * | 2012-02-09 | 2012-07-18 | 重庆邦桥科技有限公司 | Light-emitting diode (LED) color temperature adjusting and controlling device and LED color temperature continuous adjustable control method |
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2014
- 2014-01-02 CN CN201410002171.8A patent/CN104768268A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101956937A (en) * | 2010-09-26 | 2011-01-26 | 重庆邦桥科技有限公司 | Color temperature adjustable light emitting diode (LED) flat lamp for sickroom |
| CN102595722A (en) * | 2012-02-09 | 2012-07-18 | 重庆邦桥科技有限公司 | Light-emitting diode (LED) color temperature adjusting and controlling device and LED color temperature continuous adjustable control method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116347706A (en) * | 2023-04-05 | 2023-06-27 | 杭州方千科技有限公司 | Traffic signal lamp power supply and control method |
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Application publication date: 20150708 |