CN103124451A - LED driving circuit and LED taxiway edge light - Google Patents
LED driving circuit and LED taxiway edge light Download PDFInfo
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- CN103124451A CN103124451A CN201110369178XA CN201110369178A CN103124451A CN 103124451 A CN103124451 A CN 103124451A CN 201110369178X A CN201110369178X A CN 201110369178XA CN 201110369178 A CN201110369178 A CN 201110369178A CN 103124451 A CN103124451 A CN 103124451A
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Abstract
The invention is applicable to the field of LED lamps, and particularly relates to an LED driving circuit and an LED taxiway edge light. The current of the LED driving circuit is transformed from high to low by an industrial frequency transformer, the LED driving circuit is simple in structure, the current and voltage are efficiently transformed by charge and discharge of an energy-storage capacitor, accordingly, energy consumption of the LED driving circuit is reduced, the adaptability of the driving circuit is higher by the aid of a voltage limiting protection circuit, and the driving circuit is protected from damage.
Description
Technical field
The invention belongs to the LED field of light fittings, relate in particular to a kind of LED drive circuit and LED taxiway edge light.
Background technology
At present, the navaid light fixture of most domestic airport use is still the light fixture of conventional light source, as metal halid lamp.Use the light fixture of this kind light source, have simple, the safe and reliable advantage of circuit, but the halogen light source life-span is short, generally about 1000 hours, so use the light fixture of Halogen lamp LED to need often to change light source, maintenance cost is high.
Along with solid state light emitter LED technology development, the LED lighting technology is applied in aviation lighting field, airport has become possibility.It is long that LED light source has the life-span, and energy-conservation advantage be the more important thing is in use procedure afterwards, can avoid often changing light source and cause the high problem of maintenance cost.
For the airport electric power system, halogen light source is pure resistive load, and LED light source is non-resistive load, need to seal in special driving power, the load of driving power constant current output driving LED.Because the constant current source supply of effective value is adopted in the airfield aid power supply, current value is larger, direct driving LED otherwise will burn the LED load, or therefore needing a kind of part flow arrangement be constant-voltage equipment, first will input large current conversion and become constant voltage, then convert constant voltage to constant current and light LED.
But the driving circuit structure of existing LED taxiway edge light is complicated, and particularly in the current conversion part, in addition, the drive circuit of existing LED taxiway edge light adopts resistance to realize when current conversion is become constant voltage, can have like this problem of power consumption.
Summary of the invention
The object of the present invention is to provide a kind of LED drive circuit, there is the problem of complex structure and power consumption in the drive circuit that is intended to solve present LED taxiway edge light.
The present invention is achieved in that a kind of LED drive circuit, connects respectively power supply and LED load, and described LED drive circuit comprises:
Be connected to power pack, rectification circuit and isolating diode between the input of described power supply and LED load in turn, described power pack is the silicon steel sheet Industrial Frequency Transformer, the armature winding of described silicon steel sheet Industrial Frequency Transformer connects described power supply, and the secondary winding of described silicon steel sheet Industrial Frequency Transformer connects described rectification circuit;
Described LED drive circuit also comprises:
Be connected to the public connecting end of anode of described rectification circuit and isolating diode and the pressure limited protection circuit between ground;
Be connected to the public connecting end of input of the negative electrode of described isolating diode and LED load and the storage capacitor between ground; And
Be connected to the output of described LED load and the constant-current circuit between ground.
Another object of the present invention is to provide a kind of LED taxiway edge light, comprise the LED load, described LED taxiway edge light also comprises above-mentioned LED drive circuit.
In the present invention; LED drive circuit adopts Industrial Frequency Transformer to realize electric current conversion from large to small; make LED drive circuit simple in structure; utilize discharging and recharging of storage capacitor to realize the efficient conversion of current/voltage; thereby reduced the power consumption of LED drive circuit; and adopt pressure limited protection circuit to make the circuit adaptive capacity stronger, protective circuit is not damaged.
Description of drawings
Fig. 1 is the circuit structure diagram of the LED drive circuit that provides of first embodiment of the invention;
Fig. 2 is the circuit structure diagram of the LED drive circuit that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, is not intended to limit the present invention.
Fig. 1 shows the circuit structure of the LED drive circuit that first embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
A kind of LED drive circuit connects respectively power supply 100 and LED load 200, and LED drive circuit comprises:
Be connected to power pack 300, rectification circuit 400 and isolating diode D2 between the input of power supply 100 and LED load 200 in turn, power pack 300 is silicon steel sheet Industrial Frequency Transformer T1, the armature winding of silicon steel sheet Industrial Frequency Transformer T1 connects power supply 100, and the secondary winding of silicon steel sheet Industrial Frequency Transformer T1 connects rectification circuit 400;
LED drive circuit also comprises:
Be connected to public connecting end and the pressure limited protection circuit between ground 500 of the anode of rectification circuit 400 and isolating diode D2;
Be connected to public connecting end and the storage capacitor between ground 600 of the input of the negative electrode of isolating diode D2 and LED load 200; And
Be connected to output and the constant-current circuit between ground 700 of LED load 200.
As one embodiment of the invention, pressure limited protection circuit 500 comprises:
Fast conducting voltage stabilizing didoe D3, divider resistance R5, divider resistance R6 and switching tube 501;
The negative electrode of fast conducting voltage stabilizing didoe D3 connects the public connecting end of the anode of rectification circuit 400 and isolating diode D2, the anode of fast conducting voltage stabilizing didoe D3 is by divider resistance R5 and the divider resistance R6 ground connection of series connection, the control termination divider resistance R5 of switching tube 501 and the public connecting end of divider resistance R6, the public connecting end of the high potential termination rectification circuit 400 of switching tube 501 and the anode of isolating diode D2, the cold end ground connection of switching tube 501.
As one embodiment of the invention, switching tube 501 adopts N-type metal-oxide-semiconductor Q1, and the grid of N-type metal-oxide-semiconductor Q1 is the control end of switching tube 501, and the drain electrode of N-type metal-oxide-semiconductor Q1 is the hot end of switching tube 501, and the source electrode of N-type metal-oxide-semiconductor Q1 is the cold end of switching tube 501.
As one embodiment of the invention, rectification circuit 400 is rectifier bridge D1, the secondary winding of the input termination silicon steel sheet Industrial Frequency Transformer T1 of rectifier bridge D1, the anode of the output termination isolating diode D2 of rectifier bridge D1.
As one embodiment of the invention, constant-current circuit 700 adopts current regulator diode D10, current regulator diode D11 and current regulator diode D12, and current regulator diode D10, current regulator diode D11 and current regulator diode D12 are connected between the output and ground of LED load 200.
Fig. 2 shows the circuit structure of the LED drive circuit that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention, and details are as follows.
As one embodiment of the invention, switching tube 501 adopts NPN type triode Q2, the base stage of NPN type triode Q2 is the control end of switching tube 501, and the current collection of NPN type triode Q2 is the hot end of switching tube 501 very, and the emission of NPN type triode Q2 is the cold end of switching tube 501 very.
A kind of LED taxiway edge light that the embodiment of the present invention also provides comprises LED load 200, and the LED taxiway edge light also comprises above-mentioned LED drive circuit.
The below adopts N-type metal-oxide-semiconductor Q1 as example take switching tube 501, and the operation principle of the drive circuit of LED taxiway edge light is described:
The large electric current of power supply 100 outputs is after silicon steel sheet Industrial Frequency Transformer T1 is transformed into little electric current, again by becoming direct current after rectifier bridge D1 rectification, direct current charges to storage capacitor 600 through isolating diode D2, the voltage at storage capacitor 600 two ends constantly rises, when voltage rises to operating voltage summation greater than LED load 200 cut-in voltages and constant-current circuit 700, constant-current circuit 700 work, LED is lit, after the LED normal operation, the electric current in whole loop keeps balance, and the voltage at storage capacitor 600 two ends is kept relatively stable.
After LED load 200 open circuits, there is no the loop in circuit, electric current is not consumed, and power supply 100 can only be to storage capacitor 600 chargings, and this moment, storage capacitor 600 both end voltage constantly rose, if do not take measures, will cause that storage capacitor 600 is breakdown or damage circuit.For addressing this problem, we have added pressure limited protection circuit 500, when storage capacitor 600 both end voltage rise to set point 24V, form pressure limited protection circuit 500 work by N-type metal-oxide-semiconductor Q1 and fast conducting voltage stabilizing didoe D3, N-type metal-oxide-semiconductor Q1 conducting, loop current directly flows back to through N-type metal-oxide-semiconductor Q1, and without isolating diode D2 to storage capacitor 600, this moment, loop current was no longer charged to storage capacitor 600, and the effect of isolating diode D2 is exactly the electric current backflow that prevents on electric capacity; After LED load 200 closures, when storage capacitor 600 both end voltage drop to lower than 24V, N-type metal-oxide-semiconductor Q1 cut-off, loop current continues storage capacitor 600 and LED load 200 power supplies, so periodic duty.
In embodiments of the present invention; LED drive circuit adopts Industrial Frequency Transformer to realize electric current conversion from large to small; make LED drive circuit simple in structure; utilize discharging and recharging of storage capacitor to realize the efficient conversion of current/voltage; thereby reduced the power consumption of LED drive circuit; and adopt pressure limited protection circuit to make the circuit adaptive capacity stronger, protective circuit is not damaged.
The above is only preferred embodiment of the present invention, not in order to limiting the present invention, all any modifications of doing within the spirit and principles in the present invention, is equal to and replaces and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a LED drive circuit, connect respectively power supply and LED load, it is characterized in that, described LED drive circuit comprises:
Be connected to power pack, rectification circuit and isolating diode between the input of described power supply and LED load in turn, described power pack is the silicon steel sheet Industrial Frequency Transformer, the armature winding of described silicon steel sheet Industrial Frequency Transformer connects described power supply, and the secondary winding of described silicon steel sheet Industrial Frequency Transformer connects described rectification circuit;
Described LED drive circuit also comprises:
Be connected to the public connecting end of anode of described rectification circuit and isolating diode and the pressure limited protection circuit between ground;
Be connected to the public connecting end of input of the negative electrode of described isolating diode and LED load and the storage capacitor between ground; And
Be connected to the output of described LED load and the constant-current circuit between ground.
2. LED drive circuit as claimed in claim 1, is characterized in that, described pressure limited protection circuit comprises:
Fast conducting voltage stabilizing didoe D3, divider resistance R5, divider resistance R6 and switching tube;
The negative electrode of described fast conducting voltage stabilizing didoe D3 connects the public connecting end of the anode of described rectification circuit and isolating diode, the anode of described fast conducting voltage stabilizing didoe D3 is by described divider resistance R5 and the divider resistance R6 ground connection of series connection, the public connecting end of the described divider resistance R5 of the control termination of described switching tube and divider resistance R6, the public connecting end of the described rectification circuit of high potential termination of described switching tube and the anode of isolating diode, the cold end ground connection of described switching tube.
3. LED drive circuit as claimed in claim 2, it is characterized in that, described switching tube adopts N-type metal-oxide-semiconductor Q1, the grid of described N-type metal-oxide-semiconductor Q1 is the control end of described switching tube, the drain electrode of described N-type metal-oxide-semiconductor Q1 is the hot end of described switching tube, and the source electrode of described N-type metal-oxide-semiconductor Q1 is the cold end of described switching tube.
4. LED drive circuit as claimed in claim 2, it is characterized in that, described switching tube adopts NPN type triode Q2, the base stage of described NPN type triode Q2 is the control end of described switching tube, the hot end of the very described switching tube of current collection of described NPN type triode Q2, the cold end of the very described switching tube of emission of described NPN type triode Q2.
5. LED drive circuit as claimed in claim 1, is characterized in that, described rectification circuit is rectifier bridge, the secondary winding of the described silicon steel sheet Industrial Frequency Transformer of input termination of described rectifier bridge, the anode of the described isolating diode of output termination of described rectifier bridge.
6. LED drive circuit as claimed in claim 1, is characterized in that, described constant-current circuit adopts current regulator diode, and described current regulator diode is connected between the output and ground of described LED load.
7. a LED taxiway edge light, comprise the LED load, it is characterized in that, described LED taxiway edge light also comprises as the described LED drive circuit of claim 1-6 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110369178.XA CN103124451B (en) | 2011-11-18 | 2011-11-18 | LED driving circuit and LED taxiway edge light |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110369178.XA CN103124451B (en) | 2011-11-18 | 2011-11-18 | LED driving circuit and LED taxiway edge light |
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| Publication Number | Publication Date |
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| CN103124451A true CN103124451A (en) | 2013-05-29 |
| CN103124451B CN103124451B (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110369178.XA Active CN103124451B (en) | 2011-11-18 | 2011-11-18 | LED driving circuit and LED taxiway edge light |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959989A (en) * | 2016-10-17 | 2018-04-24 | 国网辽宁省电力有限公司阜新供电公司 | A kind of transforming circuit device based on commutation technique |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081101A (en) * | 1998-09-04 | 2000-06-27 | Yang; Tai-Her | Temperature switch controlled charging circuit |
| CN2892354Y (en) * | 2006-04-14 | 2007-04-25 | 襄樊学院 | Combined circuit of delayed electricity breaking energy saving electric iron support |
| CN101345171A (en) * | 2007-07-12 | 2009-01-14 | 钟汝祥 | Ground fault open circuit temperature controller of self-magnet compensation permanent magnet switch |
| CN101521462A (en) * | 2008-02-29 | 2009-09-02 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN101718408A (en) * | 2009-10-30 | 2010-06-02 | 海洋王照明科技股份有限公司 | Airport pavement warning device |
-
2011
- 2011-11-18 CN CN201110369178.XA patent/CN103124451B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6081101A (en) * | 1998-09-04 | 2000-06-27 | Yang; Tai-Her | Temperature switch controlled charging circuit |
| CN2892354Y (en) * | 2006-04-14 | 2007-04-25 | 襄樊学院 | Combined circuit of delayed electricity breaking energy saving electric iron support |
| CN101345171A (en) * | 2007-07-12 | 2009-01-14 | 钟汝祥 | Ground fault open circuit temperature controller of self-magnet compensation permanent magnet switch |
| CN101521462A (en) * | 2008-02-29 | 2009-09-02 | 群康科技(深圳)有限公司 | Switch power supply circuit |
| CN101718408A (en) * | 2009-10-30 | 2010-06-02 | 海洋王照明科技股份有限公司 | Airport pavement warning device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107959989A (en) * | 2016-10-17 | 2018-04-24 | 国网辽宁省电力有限公司阜新供电公司 | A kind of transforming circuit device based on commutation technique |
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| Publication number | Publication date |
|---|---|
| CN103124451B (en) | 2015-05-13 |
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