CN103547031A - Lamp of wide voltage input LED (light emitting diode) driving circuit - Google Patents
Lamp of wide voltage input LED (light emitting diode) driving circuit Download PDFInfo
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- CN103547031A CN103547031A CN201310479890.4A CN201310479890A CN103547031A CN 103547031 A CN103547031 A CN 103547031A CN 201310479890 A CN201310479890 A CN 201310479890A CN 103547031 A CN103547031 A CN 103547031A
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Abstract
The invention discloses a lamp of a wide voltage input LED (light emitting diode) driving circuit. The lamp comprises a filtering circuit, a PWM (pulse-width modulation) light dimming circuit, a control circuit, an output driving circuit, a high-frequency rectifier circuit and an LED array, wherein a direct-current power module is connected with the control circuit via the filtering circuit and the PWM light dimming circuit; and the control circuit is connected with the LED array via the output driving circuit and the high-frequency rectifier circuit. By using a closed-loop constant-current control technology, high-precision current output can be realized under the condition of loose peripheral inductance parameters. The lamp of the wide voltage input LED driving circuit has the advantages that the voltage input range is wide, circuits are simple, the cost is reduced, the production process is simple, and the like. The voltage input range is wide; the driving circuit is efficient, safe and reliable; and the lamp can be widely used for driving various LED products.
Description
Technical field
The present invention relates to a kind of light fixture, specifically say a kind of light fixture of wide voltage input LED drive circuit, belong to electronic technology field.
Background technology
LED, due to environmental protection, the many merits such as the life-span is long, photoelectric efficiency is high, is able to fast development in all trades and professions application in recent years, and LED power supply also becomes the focus that people pay close attention to.LED power drives is that power supply supply is converted to specific electric current and voltage with the luminous electric pressure converter of driving LED, generally: the input of LED driving power comprises high pressure industrial frequency AC (being civil power), low-voltage direct, high voltage direct current, low pressure high-frequency ac (as the output of electronic transformer) etc.
Adopted pulsed drive LED in the past, its luminosity is improved, but the prerequisite necessary condition of the residing working power of LED is voltage stabilizing, secondly, when voltage is higher, the connection in series-parallel of LED all should be taked all to press or current-sharing measure, brings great trouble and restriction to thus the application of LED, and corresponding maintenance, maintenance work are also complicated.Operating voltage, drive current difference that different LED is required, and LED generally need guarantee that its output intensity is relatively stable, therefore, requires to have the LED driving power of adaptation function, so that suitable operating voltage, drive current to be provided.
The DC input voitage of the low-power equipment of present most use is an accumulator battery voltage grade often, as 12V electric pressure: 9～16V, 24V electric pressure 18～32V, 36V electric pressure 27V～48V etc., direct current input power supply can be processed, directly deliver to load and use, electric main is input to the equipment that electric pressure is identical after interchange being become to direct current after the step-downs such as Switching Power Supply.But having a lot of application is that expectation DC converter can be processed wider input voltage range, such as, in some system applies, distributed input voltage has very large transient state and surge, and the duration is very long, need under normal circumstances filter to filter, if the words of wide region input can meet the variation of its voltage, some military vehicle design specification also needs similar wide input voltage range.Using the another one reason of wide input voltage range DC converter is to set up " general " product that can be used to different direct current systems, for nominal value, be 12V, the battery system of 24V and 48V, three different input voltage versions generally need to be provided, so just increase production cost.
It is more than the state when short distance supplies electrical transmission, if supply lines is longer, and the duty ratio of band is more, voltage on transmission line will reduce too large so, cause load below to work, if load is wide region input, can adapt to longer transmission distance, band carries power adjustments more flexibly.
Summary of the invention
The deficiency existing for overcoming above-mentioned prior art, technical problem to be solved by this invention has been to provide a kind of light fixture of wide voltage input LED drive circuit, and LED light fixture can be worked in wide range input voltage, has saved production cost.
The present invention solves the technical scheme that its technical problem takes: the light fixture of wide voltage input LED drive circuit, it is characterized in that, comprise filter circuit, PWM light adjusting circuit, control circuit, output driving circuit, high-frequency rectification circuit and LED array, described DC power supplier after filtering circuit is connected with control circuit with PWM light adjusting circuit, and described control circuit is connected with LED array with high-frequency rectification circuit through output driving circuit.
Further, described filter circuit is comprised of capacitor C 1 and resistance R 1, described PWM light adjusting circuit is comprised of capacitor C 2 and resistance R 3, described control circuit is comprised of IC chip U1 and resistance R 2, described output driving circuit is comprised of resistance R 4, resistance R 5 and metal-oxide-semiconductor Q1, described high-frequency rectification circuit is comprised of diode D1, inductance L and capacitor C 3, and described LED array is formed by n LED serial connection, wherein, one end of the negative pole of one end of one end of one end of described capacitor C 1, resistance R 1, resistance R 3, diode D1, capacitor C 3 is connected with DC power supply VINDC end respectively with the positive pole of LED array, the other end of described resistance R 1 is connected with the Vin pin of IC chip U1, and the Cs pin of described IC chip U1 is connected with one end of resistance R 5 with the source electrode of metal-oxide-semiconductor Q1 respectively, the GATE pin of described IC chip U1 is connected with one end of resistance R 4 with one end of resistance R 2 respectively, the PWM pin of IC chip U1 with after the parallel connection of VDD pin, be connected with one end of capacitor C 2 with the other end of resistance R 3 respectively, the RT pin of IC chip U1 is connected with the other end of resistance R 2, the other end of described resistance R 4 is connected with the grid of metal-oxide-semiconductor Q1, the drain electrode of described metal-oxide-semiconductor Q1 is connected with the positive pole of diode D1 and one end of inductance L respectively, the other end of described inductance L is connected with the other end of capacitor C 3 and the negative pole of LED array respectively, the other end of described capacitor C 1, the GND pin of IC chip U1, the other end of the other end of resistance R 5 and capacitor C 2 is ground connection respectively.
Preferably, described diode D1 adopts voltage stabilizing didoe.
Preferably, described metal-oxide-semiconductor Q1 adopts N-type MOS transistor.
Preferably, described capacitor C 3 adopts polar capacitor, and described polar capacitor and LED array are connected in parallel.
The invention has the beneficial effects as follows, adopt after said structure, the present invention, by adopting Closed-loop Constant-current control technology, can realize high-precision output current under loose peripheral inductance parameters condition, have wide range input, circuit simple, reduce costs and the feature such as production technology is simple.
The present invention has wide range input voltage, and drive circuit is efficient, safety, reliable, can be widely used in the driving of various LED products.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, the invention will be further described:
Fig. 1 is theory diagram of the present invention;
Fig. 2 is circuit theory diagrams of the present invention.
Embodiment
As shown in Figure 1, the light fixture of a kind of wide voltage input LED drive circuit of the present invention, it comprises filter circuit, PWM light adjusting circuit, control circuit, output driving circuit, high-frequency rectification circuit and LED array, described DC power supplier after filtering circuit is connected with control circuit with PWM light adjusting circuit, and described control circuit is connected with LED array with high-frequency rectification circuit through output driving circuit.
As depicted in figs. 1 and 2, described filter circuit is comprised of capacitor C 1 and resistance R 1; Described PWM light adjusting circuit is comprised of capacitor C 2 and resistance R 3; Described control circuit is comprised of IC chip U1 and resistance R 2, IC chip adopts PWM technology and CMOS technological design, integrated built-in pressurizer, under-voltage protection, temperature protection, the saturated protection of inductance, RC oscillator, light adjusting controller, the modules such as system controller and output driving, work within the scope of 80VDC at input voltage 12VDC; Described output driving circuit is comprised of resistance R 4, resistance R 5 and metal-oxide-semiconductor Q1; Described high-frequency rectification circuit is comprised of diode D1, inductance L and capacitor C 3; Described LED array is formed by n LED serial connection.
Fig. 2 is circuit theory diagrams of the present invention.As shown in Figure 2, a kind of concrete implementing circuit of the present invention is by capacitor C 1, resistance R 1, capacitor C 2, resistance R 3, IC chip U1, resistance R 2, resistance R 4, resistance R 5, N-type MOS transistor Q1, voltage stabilizing didoe D1, inductance L, polar capacitor C3 with form LED array by n LED serial connection and form.Wherein, one end of the negative pole of one end of one end of one end of described capacitor C 1, resistance R 1, resistance R 3, voltage stabilizing didoe D1, polar capacitor C3 is connected with DC power supply VINDC end respectively with the positive pole of LED array, the other end of described resistance R 1 is connected with the Vin pin of IC chip U1, and the Cs pin of described IC chip U1 is connected with one end of resistance R 5 with the source electrode of N-type MOS transistor Q1 respectively, the GATE pin of described IC chip U1 is connected with one end of resistance R 4 with one end of resistance R 2 respectively, the PWM pin of IC chip U1 with after the parallel connection of VDD pin, be connected with one end of capacitor C 2 with the other end of resistance R 3 respectively, the RT pin of IC chip U1 is connected with the other end of resistance R 2, the other end of described resistance R 4 is connected with the grid of N-type MOS transistor Q1, the drain electrode of described N-type MOS transistor Q1 is connected with the positive pole of voltage stabilizing didoe D1 and one end of inductance L respectively, the other end of described inductance L is connected with the other end of polar capacitor C3 and the negative pole of LED array respectively, the other end of described capacitor C 1, the GND pin of IC chip U1, the other end of the other end of resistance R 5 and capacitor C 2 is ground connection respectively.
The course of work of the present invention is as follows:
Power up: direct current → LED → L → Q1 → R5, the inductance L after-current that powers on is not undergone mutation, and leave the time of detecting electric current can to resistance R 5, for next process afterflow provides condition yet.The inductance L magnitude of current and sense value must coincidence circuit basic needs, and large electric current suitably increases sense value, and the magnitude of current is chosen actual LED electric current more than 3 times.Resistance R 5 value feedback voltages determine load actual current size, and resistance needs suitably to adjust and choose in conjunction with LED electric current by supply power voltage, is also load LED current regulating resistance.When R5 feedback voltage reaches suitable value, IC chip U1 can close metal-oxide-semiconductor Q1, at this moment the engineering of discharging starts: discharging current direction is by L → D → LED, it is little that D is that Schottky diode is chosen forward voltage, frequency will select actual operating frequency more than 3 times, maximum current is greater than the more than 2 times of LED actual current, withstand voltage the more than 1.5 times of supply power voltage peak value that are greater than.
In specific implementation process of the present invention; the voltage stabilizing IC chip that the model that IC chip U1 can adopt Shenzhen Shuo Xin Science and Technology Ltd. to produce is SX3601; SX3601 is the high withstand voltage 25V-75V voltage dropping power supply chip of a DC-DC; the functions such as inner integrated reference power supply, oscillator, error amplifier, overtemperature protection, current-limiting protection, short-circuit protection are applicable to the above applications of high pressure 60V very much.
The above is the preferred embodiment of the present invention, for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, and these improvements and modifications are also regarded as protection scope of the present invention.
Claims (5)
1. wide voltage is inputted the light fixture of LED drive circuit, it is characterized in that, comprise filter circuit, PWM light adjusting circuit, control circuit, output driving circuit, high-frequency rectification circuit and LED array, described DC power supplier after filtering circuit is connected with control circuit with PWM light adjusting circuit, and described control circuit is connected with LED array with high-frequency rectification circuit through output driving circuit.
2. wide voltage according to claim 1 is inputted the light fixture of LED drive circuit, it is characterized in that, described filter circuit is comprised of capacitor C 1 and resistance R 1, described PWM light adjusting circuit is comprised of capacitor C 2 and resistance R 3, described control circuit is comprised of IC chip U1 and resistance R 2, described output driving circuit is comprised of resistance R 4, resistance R 5 and metal-oxide-semiconductor Q1, and described high-frequency rectification circuit is comprised of diode D1, inductance L and capacitor C 3, and described LED array is formed by n LED serial connection, wherein, one end of the negative pole of one end of one end of one end of described capacitor C 1, resistance R 1, resistance R 3, diode D1, capacitor C 3 is connected with DC power supply VINDC end respectively with the positive pole of LED array, the other end of described resistance R 1 is connected with the Vin pin of IC chip U1, and the Cs pin of described IC chip U1 is connected with one end of resistance R 5 with the source electrode of metal-oxide-semiconductor Q1 respectively, the GATE pin of described IC chip U1 is connected with one end of resistance R 4 with one end of resistance R 2 respectively, the PWM pin of IC chip U1 with after the parallel connection of VDD pin, be connected with one end of capacitor C 2 with the other end of resistance R 3 respectively, the RT pin of IC chip U1 is connected with the other end of resistance R 2, the other end of described resistance R 4 is connected with the grid of metal-oxide-semiconductor Q1, the drain electrode of described metal-oxide-semiconductor Q1 is connected with the positive pole of diode D1 and one end of inductance L respectively, the other end of described inductance L is connected with the other end of capacitor C 3 and the negative pole of LED array respectively, the other end of described capacitor C 1, the GND pin of IC chip U1, the other end of the other end of resistance R 5 and capacitor C 2 is ground connection respectively.
3. the light fixture of wide voltage input LED drive circuit according to claim 2, is characterized in that, described diode D1 adopts voltage stabilizing didoe.
4. the light fixture of wide voltage input LED drive circuit according to claim 2, is characterized in that, described metal-oxide-semiconductor Q1 adopts N-type MOS transistor.
5. the light fixture of wide voltage input LED drive circuit according to claim 2, is characterized in that, described capacitor C 3 adopts polar capacitor, and described polar capacitor and LED array are connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310479890.4A CN103547031A (en) | 2013-10-14 | 2013-10-14 | Lamp of wide voltage input LED (light emitting diode) driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310479890.4A CN103547031A (en) | 2013-10-14 | 2013-10-14 | Lamp of wide voltage input LED (light emitting diode) driving circuit |
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| CN103547031A true CN103547031A (en) | 2014-01-29 |
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| CN201310479890.4A Pending CN103547031A (en) | 2013-10-14 | 2013-10-14 | Lamp of wide voltage input LED (light emitting diode) driving circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105792455A (en) * | 2014-12-15 | 2016-07-20 | 广东雪莱特光电科技股份有限公司 | LED drive circuit |
| CN106151903A (en) * | 2016-08-20 | 2016-11-23 | 华南理工大学 | A kind of visible light communication LED lamp for PAM modulation |
| CN110235522A (en) * | 2016-07-28 | 2019-09-13 | 亮锐有限责任公司 | Dimming LED (Light Emitting Diode) circuit augmentation DC/DC controller IC |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100213862A1 (en) * | 2009-02-20 | 2010-08-26 | Ampower Technology Co., Ltd. | Light source driving device |
| CN203523106U (en) * | 2013-10-14 | 2014-04-02 | 济南合力达电力科技有限公司 | Wide-voltage input LED drive circuit-based light fixture |
-
2013
- 2013-10-14 CN CN201310479890.4A patent/CN103547031A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100213862A1 (en) * | 2009-02-20 | 2010-08-26 | Ampower Technology Co., Ltd. | Light source driving device |
| CN203523106U (en) * | 2013-10-14 | 2014-04-02 | 济南合力达电力科技有限公司 | Wide-voltage input LED drive circuit-based light fixture |
Non-Patent Citations (1)
| Title |
|---|
| POWTECH: "PT4107改善恒流和EMI特性的通用型高亮度LED", 《百度文库》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105792455A (en) * | 2014-12-15 | 2016-07-20 | 广东雪莱特光电科技股份有限公司 | LED drive circuit |
| CN110235522A (en) * | 2016-07-28 | 2019-09-13 | 亮锐有限责任公司 | Dimming LED (Light Emitting Diode) circuit augmentation DC/DC controller IC |
| CN110235522B (en) * | 2016-07-28 | 2022-01-14 | 亮锐控股有限公司 | Dimming LED circuit amplification DC/DC controller integrated circuit |
| CN106151903A (en) * | 2016-08-20 | 2016-11-23 | 华南理工大学 | A kind of visible light communication LED lamp for PAM modulation |
| CN106151903B (en) * | 2016-08-20 | 2023-02-14 | 华南理工大学 | Visible light communication LED lamp for PAM modulation |
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Application publication date: 20140129 |