CN201682670U - Controllable LED load current driving device - Google Patents
Controllable LED load current driving device Download PDFInfo
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- CN201682670U CN201682670U CN201020181368XU CN201020181368U CN201682670U CN 201682670 U CN201682670 U CN 201682670U CN 201020181368X U CN201020181368X U CN 201020181368XU CN 201020181368 U CN201020181368 U CN 201020181368U CN 201682670 U CN201682670 U CN 201682670U
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Abstract
The utility model belongs to the power supply of illuminating light source, especially to a controllable LED load current driving device, which is characterized in that an over-current, over-voltage, over-heating and under-voltage signal sampling circuit and an over-current, over-voltage, over-heating and under-voltage protection circuit are connected between a constant current and constant voltage output circuit and a single-ended flyback DC/DC power converter, a voltage fluctuation signal extracted by the over-current, over-voltage, over-heating and under-voltage signal sampling circuit is used for controlling the output of the single-ended flyback DC/DC power converter after passing through the over-current, over-voltage, over-heating and under-voltage protection circuit, thereby leading the constant current and constant voltage output circuit to output stable voltage and current, and the over-current, over-voltage, over-heating and under-voltage protection circuit adopts a current control mode PWM/PFM generator. The utility model provides a controllable LED load current driving device which has high power, good reliability, and small changes with the factors, such as input voltage, temperature, and the like.
Description
Technical field
The utility model belongs to the drive unit of the power supply of lighting source, particularly a kind of controllable LED load current.
Background technology
LE
DBe a kind of solid light source, when its two ends adds forward voltage, minority carrier in the semiconductor and majority carrier take place compound, and the excess energy of emitting will cause photo emissions.Adopt different materials, can be made into the light-emitting diode of different colours.As a kind of new light source, each major company and research institution are in the ascendant to the research of LED in recent years, and its light efficiency is greatly improved, and Lumiled company has researched and developed and produced the White LED that light efficiency reaches 90Lm/W at present, have reached the level of incandescent lamp.
With comparing of incandescent lamp, LED has lot of advantages on performance:
See the following form:
The performance of table 1 incandescent lamp and White LED relatively
New light source is called new high-power LED drive circuit, and different with the electric ballast of fluorescent lamp, the major function of led drive circuit is that alternating voltage is converted to constant-current supply, and finishes the coupling with the voltage and current of LED simultaneously.
In practice, connection in series-parallel LED forming array is often adopted in load, this can make output current more remarkable with the variation that factors such as input voltage and ambient temperature take place, and array format or LED number change, current-limiting resistance is also answered respective change, so it is fixing to adopt the led drive circuit of this simple structure generally only to be suitable for driving array format, and lamp number less LED display.
The mathematical model of LED voltage-current characteristic can be represented by the formula
VF=Vturn-on+RsIF+（ΔVF/ΔT）（T-25℃）
Wherein, Vturn-on is the starting resistor of LED.
Rs represents the slope of volt-ampere curve.The T ambient temperature, Δ VF/ Δ T is the temperature coefficient of LED forward voltage, representative value is-2V/ ℃ for most LED.
From volt-ampere curve and the mathematical model of LED, the great changes of the LED tiny change of its forward voltage behind forward conduction will causing LED electric current, and, ambient temperature, factors such as LED ageing time also will change the electric property that influences LED.And the output of the light of LED is directly relevant with the LED electric current, so led drive circuit is under the situation of factor changes such as input voltage and ambient temperature, the light output of LED will change with factors vary such as input voltage and temperature, and, if the LED electric current is out of control, the LED long-term work will influence reliability and the life-span of LED under big electric current, and might lose efficacy.
Summary of the invention
The purpose of this utility model provides big, the good reliability of a kind of power, with the drive unit of the little controllable LED load current of factors vary such as input voltage and temperature.
The purpose of this utility model realizes like this, a kind of drive unit of controllable LED load current, at least comprise: EMC and surge current control circuit, a rectification and filter circuit, single-ended flyback DC/DC power inverter, secondary rectification and filter circuit and constant current, constant voltage outputting circuit, constant current, constant voltage outputting circuit is electrically connected with two electrodes of LED battle array example, it is characterized in that: constant current, be connected with overcurrent between constant voltage outputting circuit and the single-ended flyback DC/DC power inverter, overvoltage, overheated and under-voltage signal sample circuit and overcurrent, overvoltage, overheated and under-voltage protecting circuit, overcurrent, overvoltage, the voltage fluctuation signal of the extraction of overheated and under-voltage signal sample circuit is through overcurrent, overvoltage, the output of control single-ended flyback DC/DC power inverter makes constant current behind the overheated and under-voltage protecting circuit, the voltage and current that constant voltage outputting circuit output is stable; Overcurrent, overvoltage, overheated and under-voltage protecting circuit employing current control mode PWM/PFM generator.
Described single-ended flyback DC/DC power inverter is the wide dynamic range isolated form, it comprises the voltage stabilizing circuit that voltage-stabiliser tube P6KE200A and diode IN4007 constitute, transformer T2 and TOP245 and peripheral circuit, convert the low pressure high frequency to by transformer T2 and TOP245 and the peripheral circuit high pressure low frequency that transformer T2 is elementary, the secondary of transformer T2 comprises two groups, one group offers the load led array through secondary rectification and filter circuit rectification and filtering, another group is voltage sample output, voltage sample output and IN4148/ES1D, ZMM5243B-7 and capacitor C 9 constitute overcurrent, overvoltage, overheated and under-voltage signal sample circuit.
Described voltage sample output one end arrives negative supply through IN4148/ES1D and capacitor C 9, and the other end directly arrives negative supply.
The output end of pressure-stabilizing of described IN4148/ES1D is connected with the positive terminal of electrochemical capacitor C9, its link is input to the control end C of TOP245 behind ZMM5243B-7 and resistance, feed back to the control end C of TOP245 by the output of voltage sample coil, regulate the frequency of oscillation of transformer T2 by TOP245.
Have less than the resistance of 10 Ω and the electrochemical capacitor that is connected in series between the control end C of described TOP245 and the negative supply.
The in-phase end of first group of coil of a described rectification and filter circuit output and transformer T2 is connected with capacitor C 4, and C4 selects 2.2nF/1kV for use.
The utility model has the advantages that: because the utility model has been introduced voltage or Current Feedback Control link.The user can change load led array form and LED number as required, obtains different power outputs.This drive circuit has also overcome because of input voltage simultaneously; the color of factor such as ambient temperature and LED light is drawback such as change easily; power factor reaches more than 0.9; THD can accomplish below 20%; life-span can reach more than 50000 hours; also can finish from 100% to 1% dimming function simultaneously, and these series of products also possess overvoltage and overcurrent protection function.
Description of drawings
The utility model is described in further detail below in conjunction with the embodiment accompanying drawing:
Fig. 1 is the utility model embodiment schematic block circuit diagram;
Fig. 2 is the utility model embodiment circuit diagram.
Among the figure: 1, AC220V input; 2, EMC and surge current control circuit; 3, a rectification and filter circuit; 4, single-ended flyback DC/DC power inverter; 5, secondary rectification and filter circuit; 6, constant current, constant voltage outputting circuit; 7, LED battle array example; 8, overcurrent, overvoltage, overheated and under-voltage signal sample circuit; 9, overcurrent, overvoltage, overheated and under-voltage protecting circuit.
Embodiment
As shown in Figure 1; a kind of drive unit of controllable LED load current; at least comprise: EMC and surge current control circuit 2; a rectification and filter circuit 3; single-ended flyback DC/DC power inverter 4; secondary rectification and filter circuit 5 and constant current; constant voltage outputting circuit 6; constant current; constant voltage outputting circuit 6 is electrically connected with two electrodes of LED battle array example 7; constant current; be connected with overcurrent between constant voltage outputting circuit 6 and the single-ended flyback DC/DC power inverter 4; overvoltage; overheated and under-voltage signal sample circuit 8 and overcurrent; overvoltage; overheated and under-voltage protecting circuit 9; overcurrent; overvoltage; the voltage fluctuation signal of the extraction of overheated and under-voltage signal sample circuit 8 is through overcurrent; overvoltage; overheated and under-voltage protecting circuit 9 back control single-ended flyback DC/DC power inverters 4 are exported, and make constant current; the stable voltage and current of constant voltage outputting circuit 6 outputs.Overcurrent, overvoltage, overheated and under-voltage protecting circuit 9 employing current control mode PWM/PFM generators.
As shown in Figure 2, single-ended flyback DC/DC power inverter 4 is wide dynamic range isolated forms, it comprises the voltage stabilizing circuit that voltage-stabiliser tube P6KE200A and diode IN4007 constitute, transformer T2 and TOP245 and peripheral circuit, convert the low pressure high frequency to by transformer T2 and TOP245 and the peripheral circuit high pressure low frequency that transformer T2 is elementary, the secondary of transformer T2 comprises two groups, one group offers load led array 7 through secondary rectification and filter circuit 5 rectifications and filtering, another group is voltage sample output, voltage sample output and IN4148/ES1D, ZMM5243B-7 and capacitor C 9 constitute overcurrent, overvoltage, overheated and under-voltage signal sample circuit 8.Voltage sample output one end arrives negative supply through IN4148/ES1D and capacitor C 9, and the other end directly arrives negative supply.The output end of pressure-stabilizing of IN4148/ES1D is connected with the positive terminal of electrochemical capacitor C9, and its link is input to the control end C of TOP245 behind ZMM5243B-7 and resistance, and the control end C change in voltage of TOP245 directly influences the D end frequency of oscillation of TOP243.Therefore, the electric current that electric current, change in voltage or the environment that is caused by load causes, change in voltage feed back to the control end C of TOP245 by the output of voltage sample coil, and the frequency of oscillation of regulating transformer T2 by TOP245 reaches the purpose of current stabilization, voltage stabilizing.Between the control end C of TOP245 and negative supply, have, eliminate control end C alternating voltage less than the resistance of 10 Ω and the electrochemical capacitor that is connected in series.Because TOP245 is an integrated circuit, and reliable performance is arranged.Therefore, can guarantee effectively that the electric current of supply load led array and voltage are stabilized on the set point that needs.
In the utility model, in-phase end at first group of coil of a rectification and filter circuit 3 outputs and transformer T2 is connected with capacitor C 4, C4 selects 2.2nF/1kV for use, a rectification and filter circuit 3 exchange the 220V of AC220V input 1 and become direct current, for EMC and the surge current that prevents that AC220V input 1 from producing, before a rectification and filter circuit 3, add EMC and surge current control circuit 2.
The D end one side of TOP245 is connected with the different name end of the primary coil of transformer T2, and this point also is connected to the output end of pressure-stabilizing of voltage-stabiliser tube P6KE200A by the diode IN4007GP of anti-phase connection simultaneously.Output end of pressure-stabilizing at voltage-stabiliser tube P6KE200A is connected the resistance of 100 Ω and the capacitor C 3 of serial connection with a rectification with the filter circuit output, capacitor C 3 is selected 1nF/1kV for use.
Its output current voltage of the circuit that provides among Fig. 2 is: 8V/3A.Power supply indicator is by LM358 rear drive indicator light.
Claims (6)
1. the drive unit of a controllable LED load current; at least comprise: EMC and surge current control circuit (2); a rectification and filter circuit (3); single-ended flyback DC/DC power inverter (4); secondary rectification and filter circuit (5) and constant current; constant voltage outputting circuit (6); constant current; constant voltage outputting circuit (6) is electrically connected with two electrodes of LED battle array example (7); it is characterized in that: constant current; be connected with overcurrent between constant voltage outputting circuit (6) and the single-ended flyback DC/DC power inverter (4); overvoltage; overheated and under-voltage signal sample circuit (8) and overcurrent; overvoltage; overheated and under-voltage protecting circuit (9), overcurrent; overvoltage; overheated and under-voltage protecting circuit (9) is electrically connected with single-ended flyback DC/DC power inverter (4) control end.
2. the drive unit of a kind of controllable LED load current according to claim 1, it is characterized in that: described single-ended flyback DC/DC power inverter (4) is the wide dynamic range isolated form, it comprises the voltage stabilizing circuit that voltage-stabiliser tube P6KE200A and diode IN4007 constitute, transformer T2 and TOP245 and peripheral circuit, convert the low pressure high frequency to by transformer T2 and TOP245 and the peripheral circuit high pressure low frequency that transformer T2 is elementary, the secondary of transformer T2 comprises two groups, one group is electrically connected with the load led array through secondary rectification and filter circuit (5) rectification and filtering, another group is voltage sample output, voltage sample output and IN4148/ES1D, ZMM5243B-7 and capacitor C 9 are electrically connected.
3. the drive unit of a kind of controllable LED load current according to claim 2 is characterized in that: to negative supply, the other end directly arrives negative supply to described voltage sample output one end through IN4148/ES1D and capacitor C 9.
4. the drive unit of a kind of controllable LED load current according to claim 2, it is characterized in that: the output end of pressure-stabilizing of described IN4148/ES1D is connected with the positive terminal of electrochemical capacitor C9, its link is input to the control end C of TOP245 behind ZMM5243B-7 and resistance, feed back to the control end C of TOP245 by the output of voltage sample coil.
5. the drive unit of a kind of controllable LED load current according to claim 2 is characterized in that: have less than the resistance of 10 Ω and the electrochemical capacitor that is connected in series between the control end C of described TOP245 and the negative supply.
6. the drive unit of a kind of controllable LED load current according to claim 1, it is characterized in that: the in-phase end of first group of coil of a described rectification and filter circuit (3) output and transformer T2 is connected with capacitor C 4, and C4 selects 2.2nf/1KV for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020181368XU CN201682670U (en) | 2010-05-06 | 2010-05-06 | Controllable LED load current driving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020181368XU CN201682670U (en) | 2010-05-06 | 2010-05-06 | Controllable LED load current driving device |
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| CN201682670U true CN201682670U (en) | 2010-12-22 |
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| CN201020181368XU Expired - Fee Related CN201682670U (en) | 2010-05-06 | 2010-05-06 | Controllable LED load current driving device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103379705A (en) * | 2012-04-28 | 2013-10-30 | 福建捷联电子有限公司 | Driving device of LED tube |
| CN105934045A (en) * | 2016-07-01 | 2016-09-07 | 安徽亮亮电子科技有限公司 | Single-ended flyback constant current circuit for light-emitting diode (LED) |
| CN110892323A (en) * | 2017-07-21 | 2020-03-17 | 亮锐控股有限公司 | Method of controlling a segmented flash lamp system |
-
2010
- 2010-05-06 CN CN201020181368XU patent/CN201682670U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103379705A (en) * | 2012-04-28 | 2013-10-30 | 福建捷联电子有限公司 | Driving device of LED tube |
| CN103379705B (en) * | 2012-04-28 | 2015-02-18 | 福建捷联电子有限公司 | Driving device of LED tube |
| CN105934045A (en) * | 2016-07-01 | 2016-09-07 | 安徽亮亮电子科技有限公司 | Single-ended flyback constant current circuit for light-emitting diode (LED) |
| CN110892323A (en) * | 2017-07-21 | 2020-03-17 | 亮锐控股有限公司 | Method of controlling a segmented flash lamp system |
| US11454867B2 (en) | 2017-07-21 | 2022-09-27 | Lumileds Llc | Method of controlling a segmented flash system |
| US11809064B2 (en) | 2017-07-21 | 2023-11-07 | Lumileds Llc | Method of controlling a segmented flash system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: NINGBO LONGYUAN ILLUMINATE APPLIANCE CO., LTD. Free format text: FORMER NAME: NINGBO YINZHOU LONGYUAN ILLUMINATE APPLIANCE CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: Yinzhou Qiuai town private industrial zone 315101 Zhejiang city of Ningbo province (Ningbo Longyuan Lighting Electrical Appliance Co., Ltd.) Patentee after: Ningbo Longyuan Lighting Electric Appliance Co., Ltd. Address before: Private Industrial Park Yinzhou District Qiuai town Zhejiang city Ningbo province 315101 Patentee before: Ningbo Yinzhou Longyuan Illuminated Appliance Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101222 Termination date: 20190506 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |