CN202231900U - LED power supply drive circuit - Google Patents
LED power supply drive circuit Download PDFInfo
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- CN202231900U CN202231900U CN201120285359XU CN201120285359U CN202231900U CN 202231900 U CN202231900 U CN 202231900U CN 201120285359X U CN201120285359X U CN 201120285359XU CN 201120285359 U CN201120285359 U CN 201120285359U CN 202231900 U CN202231900 U CN 202231900U
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Abstract
The utility model discloses an LED power supply drive circuit, which is connected with an external AC current, is used for controlling an LED lamp, and comprises a rectifier bridge used for converting an AC current into a DC current, a drive power module used for outputting a constant current and driving the LED lamp, and a optoelectronic coupler used for isolating, giving a feedback to or correcting the output constant current. The LED power supply drive circuit can automatically detect, give a feedback to or correct the current fluctuation of the LED lamp, enables a stable and efficient constant current to be output through a field effect transistor, can stably and reliably work without producing high frequency switch oscillation and electromagnetic radiation and high frequency interference, is free of oscillation noise, is strong in anti-ripple and anti-interference capabilities, is provided with electric energy efficiency more than 90%, and has the advantages of overload protection and overshoot protection.
Description
Technical field
The utility model relates to the LED field, particularly a kind of LED power driving circuit.
Background technology
Existing LED power driving circuit leads to common used PWM (Pulse Width Modulation; Pulse width modulation) etc. HF switch IC controls constant-current drive circuit; This power driving circuit job stability is not high, produces HF switch concussion, electromagnetic radiation and High-frequency Interference etc., also has vibrating noise, interference resistance strong; Utilization rate of electrical is not high below 80%, and the waste electric energy is unfavorable uses environmental protection.Yet anti-inadequately thunderbolt, do not have shortcomings such as antioverloading, overshoot protection,, working stability, do not have noise, not flicker or the vibrations of other light, no high frequency radiation and special power saving with the constant-current supply driving LED lamp of this circuit production.
Therefore, how solving the problems of the technologies described above is the technical problem that needs to be resolved hurrily in the industry.
Summary of the invention
The technical problem that the utility model solves mainly is: make LED power driving circuit good operating stability, reduce electromagnetic radiation, low noise, increase the utilance of electric energy, strengthen overload protection etc., a kind of LED power driving circuit is provided.
The utility model proposes a kind of LED power driving circuit; Be used for being electrically connected and controlling the LED lamp with external communication; Comprise and be used for converting alternating current into galvanic rectifier bridge; Be used to export the driving power module of constant current and driving LED lamp, be used to isolate, feed back or revise the photoelectrical coupler of output constant current.
Preferably, also comprise the overload protection module that is used for LED lamp overcurrent or overvoltage protection.
Preferably, said photoelectrical coupler comprises photophore and light-receiving device, and an end of said photophore connects with the current output terminal of rectifier bridge, and its other end is connected with an electrode of said overload protection module, LED lamp respectively; Said overload protection module is connected with another electrode of LED lamp, said driving power module respectively; The output of said light-receiving device is connected with said driving power module.
Preferably, said overload protection module is can high voltage bearing NPN type triode, and said driving power module comprises field-effect transistor, rectifier diode, voltage stabilizing didoe and the electrochemical capacitor of may command LED bright time of lamp.
Preferably; The output of said light-receiving device is connected with the G utmost point of said field-effect transistor; The cathode output end of said photophore is connected with the collector electrode of said triode, the positive pole of LED lamp respectively; The base stage of said triode is connected with the negative pole of LED lamp through a current-limiting resistance, and the emitter of said triode is connected with the D utmost point of said field-effect transistor, and the S utmost point of said field-effect transistor is connected with said rectifier bridge.
Preferably, the two ends of said electrochemical capacitor are connected with the S utmost point, the G utmost point of said field-effect transistor respectively, and the G of said field-effect transistor is serially connected with an anti-concussion resistance on extremely.
Preferably, be serially connected with the polarity free capacitor of an anti-ripple between the base stage of said triode and the collector electrode.
Preferably, said field-effect transistor is a metal-oxide half field effect transistor.
The utility model LED power driving circuit adopts photoelectrical coupler that high-tension electricity district and low voltage control district are carried out the photoelectricity isolation; Be different from the constant-current driving power supply of HF switch IC such as PWM control; Fixable back clamping voltage detects automatically, feeds back or revise the current fluctuation of LED lamp, and through the constant current of field-effect transistor output stability and high efficiency, whole power driving circuit working stability is reliable; Do not produce the HF switch concussion, do not produce electromagnetic radiation and High-frequency Interference; Do not have vibrating noise, anti-ripple, interference resistance are strong, and electric energy efficiency reaches advantages such as also having antioverloading, anti-overshoot protection more than 90%.
Description of drawings
Fig. 1 is the circuit theory diagrams of an embodiment of the utility model LED power driving circuit.
The realization of the utility model purpose, functional characteristics and advantage will combine embodiment, further specify with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
With reference to Fig. 1; One embodiment of a kind of LED power driving circuit of the utility model is proposed; This LED power driving circuit is used for being electrically connected and controlling the LED lamp with external communication, and it comprises and be used for converting alternating current into galvanic rectifier bridge W, is used to export the driving power module of constant current and driving LED lamp; Be used to isolate, feed back or revise the photoelectrical coupler U1 of output constant current, be used for the overload protection module of LED lamp overcurrent or overvoltage protection.Said photoelectrical coupler U1 comprises photophore and light-receiving device, and an end of said photophore connects with the current output terminal of rectifier bridge W, and its other end is connected with an electrode of said overload protection module, LED lamp respectively; Said overload protection module is connected with another electrode of LED lamp, said driving power module respectively; The output of said light-receiving device is connected with said driving power module.
The utility model LED power driving circuit adopts photoelectrical coupler U1 that high-tension electricity district and low voltage control district are carried out the photoelectricity isolation; Be different from the constant-current driving power supply of HF switch IC such as PWM control; Fixable back clamping voltage detects automatically, feeds back or revise the current fluctuation of LED lamp, and through the constant current of field-effect transistor Q1 output stability and high efficiency, whole power driving circuit working stability is reliable; Do not produce the HF switch concussion, do not produce electromagnetic radiation and High-frequency Interference; Do not have vibrating noise, anti-ripple, interference resistance are strong, and electric energy efficiency reaches advantages such as also having antioverloading, anti-overshoot protection more than 90%.
Said overload protection module is can high voltage bearing NPN type triode Q2; High voltage bearing NPN type triode Q2 can play the effect of protective circuit when voltage is very big, said driving power module comprises field-effect transistor Q1, rectifier diode D9, voltage stabilizing didoe D10 and the electrochemical capacitor C3 of may command LED bright time of lamp.The said field-effect transistor of present embodiment adopts metal-oxide half field effect transistor.Be connected with the G utmost point, the S utmost point of field-effect transistor Q1 again after above-mentioned rectifier diode D9, the voltage stabilizing didoe D10 series connection; The output of said light-receiving device is connected with the G utmost point of said field-effect transistor Q1; The cathode output end of said photophore is connected with the collector electrode of said triode Q2, the positive pole of LED lamp respectively; The base stage of said triode Q2 is connected with the negative pole of LED lamp through a current-limiting resistance; The emitter of said triode Q2 is connected with the D utmost point of said field-effect transistor Q1; The D utmost point of field-effect transistor Q1 through one can set the clamp voltage value of overload protection electric current resistance R Y be connected with the negative pole of LED lamp; The current output terminal of said rectifier bridge W through one can set the clamp voltage value of constant output electric current resistance R X be connected with the positive pole of LED lamp, the current output terminal of said rectifier bridge W is connected with the D utmost point of field-effect transistor Q1 through the high-power resistance R2 that a bootstrapping starts, the S utmost point of said field-effect transistor Q1 is connected with another electric current output electrode of said rectifier bridge W.The two ends of said electrochemical capacitor C3 are connected with the S utmost point, the G utmost point of said field-effect transistor Q1 respectively, and the G of said field-effect transistor Q1 is serially connected with an anti-concussion resistance R 4 on extremely.Be serially connected with the polarity free capacitor C4 of an anti-ripple between the base stage of said triode Q2 and the collector electrode.The LED lamp of multiple different capacities such as 5W, 10W, 15W, 20W, 30W or 40W, constant current output all is fit to be applied to the utility model.
Above-mentioned photoelectrical coupler U1 is to be an a kind of electric light one power conversion device of the media transmission signal of telecommunication with light.It is made up of light emitting source and light-receiving device two parts.Be assembled in photophore and light-receiving device in the same airtight housing, isolate with transparent insulator to each other.The pin of photophore is an input, and the pin of light-receiving device is an output, and common light emitting source is a light-emitting diode, and light-receiving device is photodiode, phototriode Q2 etc.
The circuit structure of the utility model is succinct, and materials used is few, does not have drive IC, does not establish transformer, can become more meticulous, and is easy to large-scale production and controls cost.Utilization rate of electrical is high, and electric energy efficiency can reach more than 90%.The power consumption of power circuit own only accounts in the 5%-15%, can be suitable for various lighting requirements, and can make accommodation according to the voltage characteristics of each department.Circuit working is stable, reliable; This circuit utilizes intrinsic electrical characteristic, the generation back clamping voltage of electronic component; Automatically feedback, controlling filed effect transistor are exported constant current; Low voltage control district and high pressure feedback district carry out photoelectricity and isolate, and element is selected the highest requirement of withstand voltage entirely for use, and entire circuit has only slight temperature to float.
This circuit adopts the automatic control constant current principle of back clamping formula feedback; Current fluctuation to the LED lamp detects, feeds back and be modified to set point automatically; Effective anti-ripple, anti-jam frequency are more than 20KHz; Under the normal situation of supplying power, exhausted flicker free of LED lamp or light vibrations can prolong the useful life of LED lamp pearl.By the direct rectifying and wave-filtering of city electrical network 220V alternating current; With 310V high voltage direct current constant-current driving LED lamp behind the rectifying and wave-filtering; Do not produce HF switch concussion (promptly do not produce electromagnetic radiation, do not make High-frequency Interference), do not produce undesirable conditions such as vibrating noise, no high frequency flicker.This circuit has soft start, when turning on light energising, can play soft protection to whole power supply and circuit for lamp at every turn, avoid the overshoot voltage impact to cause damage, and energising back 0.3-0.5 LED second lamp is bright, and the time is short.Also have overload protection, can avoid because thunderbolt, overshoot voltage and circuit damage the accidental damage to LED lamp pearl overcurrent-overvoltage that is caused, general protection LED lamp to the LED lamp.High pressure constant current design carries occurring that indivedual LED lamps puncture or during bad phenomenon such as lamp plate short circuit, reversal connection, other normal LED lamps being played protection, and current limliting, decompression are played in the short circuit electric leakage, prevents output short-circuit, reverse misconnection and damages the effect of circuit.
The input fluctuation voltage is ± 20%, maximum withstand voltage interchange 283V, and minimum value will be according to the adjustment of LED lamp quantity, and utility grid voltage is lower than the voltage that LED lamp serial number requires, and the LED lamp does not work; Select withstand voltage 450V power filtering capacitor for use, can increase the fluctuation voltage higher limit to+45%.
Rated input power: maximum 50W/field-effect transistor Q1, the power output of power supply can adjust according to the driving power of actual LED needs, and field-effect transistor Q1 selects for use more than the 75W, can connect a plurality of field-effect transistor Q1 parallel connection to increase driving power.
Output driving current: 1 to 200 milliampere/field-effect transistor Q1, output current can adjust according to the drive current of actual LED needs, and many field-effect transistors Q1 parallel connection can increase output driving current.
Unloaded output voltage: 305V ± 5V is when input voltage is alternating current 220V.The load output voltage: 0 to 290V, and output voltage can be adjusted to optimum value according to actual LED lamp quantity, and in operating voltage range, electric current output is invariable.No-load power: maximum 0.2W, zero load refers to light at power on circuitry, access failure the situation of LED lamp.Thermal stability factor (temperature is floated the influence to output current): 0.1-0.2%/C degree (temperature becomes reverse value with the change of electric current).
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure transformation that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (8)
1. LED power driving circuit; Be used for being electrically connected and controlling the LED lamp with external communication; It is characterized in that; Comprise being used for converting alternating current into galvanic rectifier bridge, be used to export the driving power module of constant current and driving LED lamp, be used to isolate, feed back or revise the photoelectrical coupler of output constant current.
2. LED power driving circuit according to claim 1 is characterized in that, also comprises the overload protection module that is used for LED lamp overcurrent or overvoltage protection.
3. LED power driving circuit according to claim 2; It is characterized in that; Said photoelectrical coupler comprises photophore and light-receiving device, and an end of said photophore connects with the current output terminal of rectifier bridge, and its other end is connected with an electrode of said overload protection module, LED lamp respectively; Said overload protection module is connected with another electrode of LED lamp, said driving power module respectively; The output of said light-receiving device is connected with said driving power module.
4. LED power driving circuit according to claim 3; It is characterized in that; Said overload protection module is can high voltage bearing NPN type triode, and said driving power module comprises field-effect transistor, rectifier diode, voltage stabilizing didoe and the electrochemical capacitor of may command LED bright time of lamp.
5. LED power driving circuit according to claim 4; It is characterized in that; The output of said light-receiving device is connected with the G utmost point of said field-effect transistor, and the cathode output end of said photophore is connected with the collector electrode of said triode, the positive pole of LED lamp respectively, and the base stage of said triode is connected with the negative pole of LED lamp through a current-limiting resistance; The emitter of said triode is connected with the D utmost point of said field-effect transistor, and the S utmost point of said field-effect transistor is connected with said rectifier bridge.
6. according to each described LED power driving circuit in the claim 1 to 5, it is characterized in that the two ends of said electrochemical capacitor are connected with the S utmost point, the G utmost point of said field-effect transistor respectively, the G of said field-effect transistor is serially connected with an anti-concussion resistance on extremely.
7. LED power driving circuit according to claim 6 is characterized in that, is serially connected with the polarity free capacitor of an anti-ripple between the base stage of said triode and the collector electrode.
8. LED power driving circuit according to claim 7 is characterized in that, said field-effect transistor is a metal-oxide half field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120285359XU CN202231900U (en) | 2011-08-08 | 2011-08-08 | LED power supply drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201120285359XU CN202231900U (en) | 2011-08-08 | 2011-08-08 | LED power supply drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202231900U true CN202231900U (en) | 2012-05-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201120285359XU Expired - Fee Related CN202231900U (en) | 2011-08-08 | 2011-08-08 | LED power supply drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202231900U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238784A (en) * | 2011-08-08 | 2011-11-09 | 张晓华 | Light-emitting diode (LED) power supply driving circuit |
| CN103582228A (en) * | 2012-08-12 | 2014-02-12 | 王济生 | Current stabilizing circuit for 5watt LED environmental-friendly energy-saving lamp |
-
2011
- 2011-08-08 CN CN201120285359XU patent/CN202231900U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102238784A (en) * | 2011-08-08 | 2011-11-09 | 张晓华 | Light-emitting diode (LED) power supply driving circuit |
| CN103582228A (en) * | 2012-08-12 | 2014-02-12 | 王济生 | Current stabilizing circuit for 5watt LED environmental-friendly energy-saving lamp |
| CN103582228B (en) * | 2012-08-12 | 2015-05-20 | 王济生 | Current stabilizing circuit for 5watt LED environmental-friendly energy-saving lamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120523 Termination date: 20140808 |
|
| EXPY | Termination of patent right or utility model |