CN2884779Y - LED driving circuit for industrial instrument - Google Patents
LED driving circuit for industrial instrument Download PDFInfo
- Publication number
- CN2884779Y CN2884779Y CN200520121063.9U CN200520121063U CN2884779Y CN 2884779 Y CN2884779 Y CN 2884779Y CN 200520121063 U CN200520121063 U CN 200520121063U CN 2884779 Y CN2884779 Y CN 2884779Y
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- circuit
- output
- bus
- resistance
- led driving
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Abstract
The utility model relates to a LED drive circuit for industrial instruments, comprising a booster circuit connected between the constant current output bus-bars of the instrument and a buck-oriented circuit connected with the output in said boost circuit; the output of said buck-oriented circuit is connected and outputs the voltage to the LED of the industrial instrument. The current provided in the bus-bars is constant, according to the energy conservation theorem, therefore the current output to the LED is the ratio value of the output voltage value of the boost circuit and of the output voltage value of the buck-oriented circuit and the product of the current value of the bus-bars, thus obtaining the greater drive current, thereby raising the brightness of the LED effectively and enhancing its display effect.
Description
Technical field
The utility model relates to industrial instrument, more particularly, relates to the drive circuit of the light-emitting diode of industrial instrument.
Background technology
Existing light-emitting diode (LED) is the luminescent device that belongs to current drives, and the electric current that flows through LED by adjusting is regulated the brightness of LED.
At present, going up more and more at some industrial instruments (for example digital voltmeter, ammeter etc.), use LED indicates as signal or caution, numeral demonstration etc.Usually LED directly is serially connected on the bus of instrument, yet because the requirement of industrial design and the restriction of technical merit, LED often can only obtain the driving energy of 2mA on the bus of instrument.Cause when practical application, often because of the deficiency of drive current, the defective that the LED display effect is not good enough.
The utility model content
The technical problems to be solved in the utility model is, the drive current defect of insufficient at the led drive circuit of the industrial instrument of prior art provides a kind of LED driving circuit that is used for industrial instrument that can effectively improve the drive current of LED.
The technical scheme that its technical problem that solves the utility model adopts is: construct a kind of LED driving circuit that is used for industrial instrument, the step-down guiding circuit that is included in the booster circuit that connects between the constant current output bus of instrument, connects at the output of described booster circuit; The output connection of described step-down guiding circuit and output voltage are to the light-emitting diode of industrial instrument.
In the LED driving circuit that is used for industrial instrument of the present utility model, described output bus comprises malleation bus L_ and earth bus S_.
In the LED driving circuit that is used for industrial instrument of the present utility model, described booster circuit comprises adjustable shunting benchmark device, first resistance and second resistance; After described first resistance and second resistance are connected in series, again and described adjustable shunting benchmark device be attempted by between the described output bus; Described adjustable shunting benchmark device comprises and is connected cathode terminal, the anode tap that is connected with described malleation bus with described earth bus and is connected reference edge between described first resistance and second resistance.
In the LED driving circuit that is used for industrial instrument of the present utility model, described adjustable shunting benchmark device is TL431.
In the LED driving circuit that is used for industrial instrument of the present utility model, described step-down guiding circuit is the MAX1044 chip; The voltage input end of described MAX1044 chip is connected with the output of described booster circuit, and the output of described MAX1044 chip is connected with described light-emitting diode.
In the LED driving circuit that is used for industrial instrument of the present utility model, the constant current of exporting between described malleation bus L_ and earth bus S_ is 2mA; The ratio of described first resistance and second resistance is 0.68; Described booster circuit output is the anode tap of described TL431, and its output potential is 4.2V; The output potential of the output of described booster circuit is 2.1V.
In the LED driving circuit that is used for industrial instrument of the present utility model, between described booster circuit and described step-down guiding circuit, also be provided with voltage stabilization delay circuit.
In the LED driving circuit that is used for industrial instrument of the present utility model, on bus, be connected with the filter circuit of pressure-stabilizing in parallel with described booster circuit.
Implement the LED driving circuit that is used for industrial instrument of the present utility model, has following beneficial effect: by between the output bus of instrument, inserting booster circuit, make the output voltage between bus raise, and then by the high voltage guiding reduction of step-down guiding circuit falling-rising, output in the light-emitting diode, because the electric current on the bus is constant, according to principle of conservation of energy, the electric current that outputs to light-emitting diode is the product of the current value of the ratio of the magnitude of voltage exported of magnitude of voltage and the step-down guiding circuit of booster circuit output and bus, thereby obtain bigger drive current, thereby effectively improve the brightness of light-emitting diode, improve its display effect.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the schematic block diagram that the utility model is used for the LED driving circuit of industrial instrument.
Fig. 2 is the circuit diagram of a specific embodiment of the utility model LED driving circuit of being used for industrial instrument.
Embodiment
As shown in Figure 1 and Figure 2, of the present utility modelly can be used for driving light-emitting diode 60 on the industrial instrument with light-emitting diode 60 drive circuits, it comprises booster circuit 10 between the output bus that is connected instrument and the step-down guiding circuit 20 that connects at the output of described booster circuit 10.
Described output bus comprises malleation bus L_ and earth bus S_.In the present embodiment, described booster circuit 10 comprises adjustable shunting benchmark device, first resistance and second resistance.After described first resistance and second resistance are connected in series, again and described adjustable shunting benchmark device be attempted by between the described output bus.Described adjustable shunting benchmark device comprises and is connected cathode terminal, the anode tap that is connected with described malleation bus with described earth bus and is connected reference edge between described first resistance and second resistance.Described adjustable shunting benchmark device contains a reference voltage, and comes boosted output voltages in conjunction with first resistance and second resistance.And then by the high voltage guiding reduction of step-down guiding circuit 20 falling-risings, output in the light-emitting diode 60, because the electric current on the bus is constant, according to principle of conservation of energy, the electric current that outputs to light-emitting diode 60 is the product of the current value of the ratio of the magnitude of voltage exported of magnitude of voltage and the step-down guiding circuit 20 of booster circuit 10 output and bus, thereby obtain bigger drive current, thereby the brightness that effectively improves light-emitting diode 60 improves its display effect.
In the present embodiment, on described bus, be connected with the filter circuit of pressure-stabilizing 30 in parallel, thereby make that to be input to the electric current of described booster circuit 10 from bus more stable with described booster circuit 10.Also be provided with voltage stabilization delay circuit 40 between described booster circuit 10 and described step-down guiding circuit 20, the output of described voltage stabilization delay circuit 40 is connected among the CPU50 of instrument, is the CPU50 power supply.Being provided with of voltage stabilization delay circuit 40 can guarantee when fluctuation takes place curtage, effectively fluctuation eliminated or stable, thereby guaranteed that CPU50 stably works.
As shown in Figure 2, be the circuit diagram of specific embodiment of the utility model.Described filter circuit of pressure-stabilizing 30 comprises voltage stabilizing didoe DW1, capacitor C 1 and the C2 that is connected in parallel between malleation bus L_ and the earth bus S_.By described filter circuit of pressure-stabilizing 30 to eliminate current fluctuation and the clutter on the output bus.
In order to provide suitable voltage to CPU50, described adjustable shunting benchmark device is selected TL431 for use; And the ratio of described first resistance and second resistance is 0.68.Described first resistance, first end is connected on the described malleation bus, second end is connected with first end of second resistance; Second end of described second resistance is connected on the described earth bus.The a reference source that 2.5V is arranged in the described TL431, its cathode terminal is connected with described earth bus, and its anode tap links to each other with described malleation bus, and its reference edge is connected between described first resistance and second resistance.Work to CPU50 with the terminal voltage of output 4.2V by this booster circuit 10.
Between described CPU50 and booster circuit 10, voltage stabilization delay circuit 40 is set also, to eliminate because of the bus current instability voltage fluctuation that brings and time-delay etc.In the present embodiment, described voltage stabilization delay circuit 40 is selected the MAX810 chip for use, and its first pin is connected with earth bus, and crus secunda connects and is connected with field effect transistor Q1, and its tripod is connected with first end and the field effect transistor Q1 of described first resistance simultaneously.Described field effect transistor Q1 connects capacitor C 3, C4, C5, resistance R 3 and auxiliary circuits such as diode D1, D2, and output end voltage is to CPU50 then.
Described step-down guiding circuit 20 is selected the MAX1044 chip for use.The voltage input end of described MAX1044 chip is connected with the output of described booster circuit 10, and the output of described MAX1044 chip is connected with described light-emitting diode 60.The voltage of the output of booster circuit 10 is led and be depressured to 2.1V by described MAX1044 chip, output to light-emitting diode 60.Because the electric current on the bus is constant, according to principle of conservation of energy, the electric current that outputs to light-emitting diode 60 is the magnitude of voltage and the ratio of the magnitude of voltage of step-down guiding circuit 20 outputs and the product of the current value of bus of booster circuit 10 output, and promptly to hold the acquisition electric current be bus current 2mA to LED
*(4.2V/2.1V)=and 4mA, thus bigger drive current obtained, thus the brightness that effectively improves light-emitting diode 60 improves its display effect.
Claims (8)
1, a kind of LED driving circuit that is used for industrial instrument is characterized in that, the step-down guiding circuit that is included in the booster circuit that connects between the constant current output bus of instrument, connects at the output of described booster circuit; The output connection of described step-down guiding circuit and output voltage are to the light-emitting diode of industrial instrument.
2, the LED driving circuit that is used for industrial instrument according to claim 1 is characterized in that, described output bus comprises malleation bus L_ and earth bus S_.
3, the LED driving circuit that is used for industrial instrument according to claim 2 is characterized in that, described booster circuit comprises adjustable shunting benchmark device, first resistance and second resistance; After described first resistance and second resistance are connected in series, again and described adjustable shunting benchmark device be attempted by between the described output bus; Described adjustable shunting benchmark device comprises and is connected cathode terminal, the anode tap that is connected with described malleation bus with described earth bus and is connected reference edge between described first resistance and second resistance.
4, the LED driving circuit that is used for industrial instrument according to claim 3 is characterized in that, described adjustable shunting benchmark device is TL431.
5, the LED driving circuit that is used for industrial instrument according to claim 4 is characterized in that, described step-down guiding circuit is the MAX1044 chip; The voltage input end of described MAX1044 chip is connected with the output of described booster circuit, and the output of described MAX1044 chip is connected with described light-emitting diode.
6, the LED driving circuit that is used for industrial instrument according to claim 5 is characterized in that, the constant current of exporting between described malleation bus L_ and earth bus S_ is 2mA; The ratio of described first resistance and second resistance is 0.68; Described booster circuit output is the anode tap of described TL431, and its output potential is 4.2V; The output potential of the output of described booster circuit is 2.1V.
7, the LED driving circuit that is used for industrial instrument according to claim 6 is characterized in that, also is provided with voltage stabilization delay circuit between described booster circuit and described step-down guiding circuit.
8, the LED driving circuit that is used for industrial instrument according to claim 7 is characterized in that, is connected with the filter circuit of pressure-stabilizing in parallel with described booster circuit on bus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520121063.9U CN2884779Y (en) | 2005-12-29 | 2005-12-29 | LED driving circuit for industrial instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200520121063.9U CN2884779Y (en) | 2005-12-29 | 2005-12-29 | LED driving circuit for industrial instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2884779Y true CN2884779Y (en) | 2007-03-28 |
Family
ID=37957829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200520121063.9U Expired - Lifetime CN2884779Y (en) | 2005-12-29 | 2005-12-29 | LED driving circuit for industrial instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2884779Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282606B (en) * | 2008-05-05 | 2012-10-03 | 深圳唐微科技发展有限公司 | Control method for power adapter of LED lamp without electrolysis capacitor |
| CN104407543A (en) * | 2014-11-10 | 2015-03-11 | 乐清市杰拉华电器有限公司 | Speed regulating switch of electric tool |
-
2005
- 2005-12-29 CN CN200520121063.9U patent/CN2884779Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282606B (en) * | 2008-05-05 | 2012-10-03 | 深圳唐微科技发展有限公司 | Control method for power adapter of LED lamp without electrolysis capacitor |
| CN104407543A (en) * | 2014-11-10 | 2015-03-11 | 乐清市杰拉华电器有限公司 | Speed regulating switch of electric tool |
| CN104407543B (en) * | 2014-11-10 | 2017-07-07 | 乐清市杰拉华电器有限公司 | A kind of speed-regulating switch of electric tool |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: SHENZHEN FANGDA AUTOMATION SYSTEM CO., LTD. Free format text: FORMER OWNER: FANGDA GROUP CO., LTD. Effective date: 20101119 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 518055 FANGDA INDUSTRY CITY, LONGJING, XILI TOWN, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE TO: 518055 FANGDACHENG, LONGJING, XILI, NANSHAN DISTRICT, SHENZHEN CITY, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20101119 Address after: 518055 Guangdong city of Shenzhen province Nanshan District Xili, Longjing Fangda Patentee after: Shenzhen Fangda Automation System Co., Ltd. Address before: 518055 Guangdong city of Shenzhen province Nanshan District Xili Town, Longjing Fangda industrial city Patentee before: Fangda Group Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070328 |
|
| EXPY | Termination of patent right or utility model |