CN201063915Y - LED driving terminal - Google Patents
LED driving terminal Download PDFInfo
- Publication number
- CN201063915Y CN201063915Y CNU2007201697193U CN200720169719U CN201063915Y CN 201063915 Y CN201063915 Y CN 201063915Y CN U2007201697193 U CNU2007201697193 U CN U2007201697193U CN 200720169719 U CN200720169719 U CN 200720169719U CN 201063915 Y CN201063915 Y CN 201063915Y
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- emitting diode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model relates to a light emitting diode driving terminal. A LED driving terminal can simultaneously drive a plurality of serially connected LEDs; the driving terminal mainly comprises a driving module, a signal acquisition module and an intelligent control module; the sampling voltage converted from LED working current is acquired through the signal acquisition module; the intelligent control module compares the sampling voltage with the output control voltage, and then regulates the control voltage value output to the driving module according to comparison results, so as to realize real-time closed-loop control. The utility model realizes the closed-loop control of LED output current, leads the LED output current to have high stability, and reaches the adjustable constant-current output of current.
Description
Technical field
The utility model relates to a kind of driving terminal of light-emitting device, especially for the driving terminal of adjustable constant-flow output light emitting diode, belongs to the light-emitting diode Driving technique field of power management class.
Background technology
Light-emitting diode (Light Emitting Diode is hereinafter to be referred as LED) is a kind of energy-saving and environmental protection and long new type light source of life-span, and its fundamental characteristics is: brightness changes with electric current; Except that above-mentioned fundamental characteristics, LED also has following electrology characteristic: when the voltage on being applied to LED has a small variation, will cause that the electric current on the LED that flows through produces bigger variation.In order to solve the problem that above-mentioned LED electric current is subject to apply on it voltage influence, current-limiting mode commonly used at present is: series limiting resistor on the LED current loop, change through the electric current of LED in order to control flows, perhaps adopt the PWM technology of IC chip to be used to regulate to flow through the electric current of LED.
In said method, the method for series limiting resistor exists many deficiencies on the LED current loop, mainly shows: behind the polyphone current-limiting resistance, and the LED job insecurity.Its reason is and the current-limiting resistance of LED polyphone has only played the effect of dividing potential drop, but can't produce constant electric current, and the operating current that has both made the LED that flows through is safe, and LED will follow the variation of the electric current of flowing through and flickering; And when the operating current of LED surpasses safety value, more can burn LED.In order to address the above problem, adjust the current value of the LED that flows through, the adjustment mode is: the resistance of the current-limiting resistance of connecting of known access with LED, measure the potential difference between the resistance two ends again, utilize Ohm's law to calculate the detection current value; Use FEEDBACK CONTROL and come the current value of stable flow, to reach the purpose of LED working stability through LED.The characteristic of this FEEDBACK CONTROL is, the more little control effect of controlled variable is good more, and the current value of the LED that promptly flows through small voltage difference more is just more little, and the control effect is just good more.Yet the current value of the LED that flows through in order to reach control precision becomes very hour, and the brightness of LED will variation, and is subjected to the influence of noise etc. easily.
Therefore,, also have a kind of scheme in the prior art, promptly use the LED drive unit of PWM control mode in order in big dynamic range, still to stablize the brightness of adjusting LED.The PWM control mode is: with the electric current that flows through among the constant timing on/off LED that sets, and recently regulate the brightness of LED according to regulating duty.But the moment of the electric current that flows through in disconnecting LED, its brightness regulation still can not realize stable regulation.
And above-mentioned two kinds of LED drive terminal when regulating electric current, all need manual adjustments, use survey tool to measure output current at any time, and it is also very inconvenient to operate.
The utility model content
Embodiment more of the present utility model provide a kind of light-emitting diode to drive terminal, make LED can realize stable constant current output, have improved the stability of LED brightness.
To achieve these goals, each embodiment of the present utility model comprises: driver module, signal acquisition module and intelligent control module, wherein:
Signal acquisition module is electrically connected with one or more mutual LED that connect, and is used for the electric current of the LED of the described one or more mutual series connection of real-time detection, is voltage with described current conversion, and the output sampling voltage value;
Intelligent control module is used for the described sampling voltage value of signal acquisition module output is compared with the control magnitude of voltage that outputs to driver module, regulates the control magnitude of voltage that outputs to driver module according to comparative result;
Driver module is electrically connected with described one or more mutual LED that connect, and is used to export constant current, drives the LED of described one or more mutual series connection.
By above technical scheme as can be known, a kind of light-emitting diode that embodiment more of the present utility model provide drives terminal, remedied the drawback that present LED drives terminal open loop output and output current shakiness by good data collection and Based Intelligent Control, realized that LED is operated under the constant current state, by being provided with and regulating the size of electric current output, the light and shade that has reached the LED luminous intensity is adjustable.
Also in conjunction with the accompanying drawings the utility model is described in further detail below by specific embodiment.
Description of drawings
Fig. 1 is the utility model embodiment 1 schematic diagram;
Fig. 2 is the utility model embodiment 2 schematic diagrames.
Embodiment
Some embodiment that light-emitting diode of the present utility model drives terminal are based on the D/A switch module, the driver module that boosts, amplifier, mould/number conversion module, intelligent control module and function button, display module, interface etc. constitute, closed-loop control that is connected to form the driving terminal between each module, thus realize that the constant current of LED output current is adjustable.
Embodiment 1
Drive terminal as shown in Figure 1, this drives terminal and powers on, and the LED output current is zero when being defaulted as beginning, and electric current is set, and the size that current value is set should be in the safety value scope of LED operating current; Intelligent control module 3 reads current value is set; The current value that is provided with that intelligent control module 3 will read is converted to the control magnitude of voltage through proportional algorithm, exports to driver module 4; Behind driver module 4 input control voltages, output current signal is used to drive the LED5 of the one or more mutual series connection that are connected with driver module; Gather in real time by the output current of 6 couples of LED of signal acquisition module again, be converted to sampling voltage value; Intelligent control module 3 reads sampling voltage value, and compares with the control magnitude of voltage, if sampling voltage value is higher than the control magnitude of voltage, then reduces the control magnitude of voltage that outputs to driver module; If sampling voltage value is lower than the control magnitude of voltage, then raising outputs to the control magnitude of voltage of driver module.
Present embodiment is by setting input current value in advance; Current value will be set again be converted to the control magnitude of voltage, by in intelligent control module to sampling voltage value and control magnitude of voltage comparison; According to comparative result the control magnitude of voltage is regulated, realized the closed-loop control of LED output current, thereby can realize the constant current output of LED.
It should be noted that the function button 1 that passes through that electric current can be artificial is set in the present embodiment to be provided with, for the ease of observing and monitoring in real time, can also in display module 2, show by the size that display routine will be provided with current value.
Embodiment 2
The driving terminal of present embodiment adopts 220V to exchange input transforms output through the AC-DC Switching Power Supply positive and negative 5V analog power and positive 5V digital power work as shown in Figure 2.Present embodiment all is arranged on function button 1, display module 2 and interface 7 on the control panel A, function button 1 is the button of four " MENU ", " UP " by name, " DOWN " and " ESC ", " MENU " is used to select the amount (as electric current) of needs setting, " UP " is used for increasing the value (as the rising current value) of the amount of setting, " DOWN " is used for reducing the value (as reducing current value) of the amount of setting, and " ESC " is used to withdraw from choice menus; Display module 2 is used for showing current value is set; Also comprise an interface 7 in this control panel, can connect remote control equipment, be used for by remote control equipment current value being set, this interface is connected with intelligent control module.
The driving terminal powers on, the LED output current is zero when being defaulted as beginning, (this operating current is 0～20mA) by control panel A the required output current value of LED work to be set, the output current value of LED perhaps is set by remote control equipment (as computer), the process intelligent control module is (as single-chip microcomputer, the following content of present embodiment all is example with the single-chip microcomputer) reception of 3 first functional module 31, this current value passing ratio algorithm (y=kx) is converted to the control magnitude of voltage, and (this control magnitude of voltage is 0～2.5V);
To control magnitude of voltage and be input in D/A (D/A) modular converter 41, be the driver module 42 corresponding driving magnitudes of voltage that boost.This driver module 42 that boosts is that output current can change with the variation of input voltage, and when the voltage of input driver module raise, described current signal raise with input voltage; When the voltage of the described driver module of input reduced, described current signal reduced with input voltage.As shown in Figure 2, shared two D/A modular converters in the present embodiment, two driver modules that boost, the every driver module that boosts drives two paths of LED 5, and every driver module two-way that boosts is minimum meets 6 LED, can drive two-way totally 20 LED at most.
After LED is driven, carry out real-time sampling to the electric current of the LED that flows through.To the real-time sampling of electric current is to seal in the current loop of one or more LED5 that low temperature floats, high-precision sampling resistor 61; By instrumentation amplifier 62 magnitude of voltage at the resistance two ends that measure is carried out difference and amplify, realize sampling the real-time working electric current of the LED that flows through by monitoring to sampling resistor two ends pressure reduction; With sampling voltage value be input to carry out mould/number conversion in mould/number (A/D) modular converter 63 after, by single-chip microcomputer 3 it is read.
Because sampling voltage signal shown in the present embodiment totally four tunnel, then single-chip microcomputer 3 will by different control commands to LED multi-path output read respectively, to realize real-time monitoring to different passage sampling voltages.Second functional module 32 of single-chip microcomputer will be in order to comparing from A/D modular converter 63 sampling voltage value that reads and the control magnitude of voltage that obtains from first functional module 31; Comparative result is sent into the 3rd functional module 33,, then reduce the control magnitude of voltage that is input to driver module by pid algorithm if sampling voltage value is higher than the control magnitude of voltage; If sampling voltage value is lower than the control magnitude of voltage, then be about 5uA by the pid algorithm precision that the control magnitude of voltage that is input to driver module utilizes this algorithm to regulate that raises.The control magnitude of voltage that will regulate is at last exported to driver module 4, realizes the closed-loop control of LED output current.
Drive terminal shown in the present embodiment and can drive four paths of LEDs, and every road there are a plurality of LED series connection; It is open to remote computer control that this drives terminal, therefore also should be taken into account the issue of priority of each control end, by 34 controls of single-chip microcomputer the 4th control module, as being limit priority with the remote control computer, when carrying out Long-distance Control, remind and show that this moment, local function was invalid by key control, had only under the particular case and just can realize local operation by force by special combination button key by lighting red light on the control panel.
It should be noted that to it will be recognized by those skilled in the art that LED shown in the embodiment of the present utility model drives the used D/A modular converter of terminal and the driver module that boosts all is not limited to two, can connect arbitrarily according to the driving force of this terminal; And the every LED that driver module connects that boosts also is not limited to two-way and connects 6～20 altogether, also can connect arbitrarily according to the driving force of this driver module that boosts; Remote control terminal also is not limited to one, can be a plurality of remote control terminals, is connected with single-chip microcomputer by a plurality of interfaces; Above-mentioned control panel also is not limited to shape shown in the figure, as long as can realize above-mentioned functions.
The driving terminal that is based on light-emitting diode that some embodiment of LED driving method of the present utility model describe is carried out the method that output current is adjusted to LED, by Based Intelligent Control, realizes that the constant current of LED output current is adjustable.
It should be noted that at last: above embodiment only in order to the explanation the technical solution of the utility model, is not intended to limit; Although the utility model is had been described in detail with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be made amendment to the technical scheme that aforementioned each embodiment put down in writing, and perhaps part technical characterictic wherein is equal to replacement; And these modifications or replacement do not make the essence of appropriate technical solution break away from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (8)
1. a light-emitting diode drives terminal, it is characterized in that, comprising:
Signal acquisition module is electrically connected with one or more mutual LED that connect, and is used for the electric current of the LED of the described one or more mutual series connection of real-time detection, is voltage with described current conversion, and the output sampling voltage value;
Intelligent control module is used for the described sampling voltage value of signal acquisition module output is compared with the control magnitude of voltage that outputs to driver module, regulates the control magnitude of voltage that outputs to driver module according to comparative result;
Driver module is electrically connected with described one or more mutual LED that connect, and is used to export constant current, drives the LED of described one or more mutual series connection.
2. drive terminal according to the described light-emitting diode of claim 1, it is characterized in that: described intelligent control module comprises:
First functional module is used for and will the control magnitude of voltage that current value is converted to described driver module be set;
Second functional module is used for the control magnitude of voltage of more described sampling voltage value and described driver module, regulates the control magnitude of voltage that outputs to driver module according to comparative result;
3. drive terminal according to the described light-emitting diode of claim 2, it is characterized in that: described intelligent control module also comprises: the 3rd functional module, adopt pid algorithm to regulate the described control magnitude of voltage that outputs to driver module.
4. drive terminal according to the described light-emitting diode of claim 1, it is characterized in that: described driver module comprises:
The D/A switch module, the control magnitude of voltage that is used for described intelligent control module is outputed to driver module carries out D/A switch, outputting drive voltage;
The driver module that boosts is electrically connected with the D/A switch module, and the output constant current signal is used to drive the LED of one or more mutual series connection.
5. drive terminal according to the described light-emitting diode of claim 1, it is characterized in that: described signal acquisition module comprises:
Sample resistance is connected in series with the current loop of described one or more LED;
Amplifier, the described sample resistance both end voltage value that is used to take a sample is carried out difference and is amplified;
A/D converter is used for the sampling voltage of amplifying through difference is carried out mould/number conversion, the output sampling voltage value.
6. drive terminal according to the arbitrary described light-emitting diode of claim 1 to 5, it is characterized in that: described driving terminal also further comprises: function button is used to be provided with electric current with the interface that is used to be connected remote control equipment, described function button and remote control equipment.
7. drive terminal according to the described light-emitting diode of claim 5, it is characterized in that: described intelligent control module also comprises: the 4th functional module is used to be provided with described function button and the described priority that is connected the interface of remote control equipment.
8. drive terminal according to the arbitrary described light-emitting diode of claim 1 to 5, it is characterized in that: described driving terminal also further comprises: with the display module that described function button and/or described interface are connected, be used to show the described current value that is provided with.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201697193U CN201063915Y (en) | 2007-07-13 | 2007-07-13 | LED driving terminal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201697193U CN201063915Y (en) | 2007-07-13 | 2007-07-13 | LED driving terminal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201063915Y true CN201063915Y (en) | 2008-05-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007201697193U Expired - Fee Related CN201063915Y (en) | 2007-07-13 | 2007-07-13 | LED driving terminal |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201063915Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186289A (en) * | 2011-04-18 | 2011-09-14 | 广东科立盈光电技术有限公司 | LED (Light Emitting Diode) driving power supply |
| CN102955137A (en) * | 2012-11-06 | 2013-03-06 | 中山新特丽照明电器有限公司 | Signal control converter plate |
| CN103841712A (en) * | 2012-11-27 | 2014-06-04 | 中国科学院沈阳自动化研究所 | System and method for controlling LED light source |
| CN109637461A (en) * | 2018-12-20 | 2019-04-16 | 深圳创维－Rgb电子有限公司 | A kind of mini LED television control system and method |
| CN112578837A (en) * | 2020-12-07 | 2021-03-30 | 四川富肯斯科技有限公司 | Output voltage linear regulation circuit, method and device |
-
2007
- 2007-07-13 CN CNU2007201697193U patent/CN201063915Y/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102186289A (en) * | 2011-04-18 | 2011-09-14 | 广东科立盈光电技术有限公司 | LED (Light Emitting Diode) driving power supply |
| CN102955137A (en) * | 2012-11-06 | 2013-03-06 | 中山新特丽照明电器有限公司 | Signal control converter plate |
| CN103841712A (en) * | 2012-11-27 | 2014-06-04 | 中国科学院沈阳自动化研究所 | System and method for controlling LED light source |
| CN103841712B (en) * | 2012-11-27 | 2015-09-09 | 中国科学院沈阳自动化研究所 | A kind of LED light source control system and method |
| CN109637461A (en) * | 2018-12-20 | 2019-04-16 | 深圳创维－Rgb电子有限公司 | A kind of mini LED television control system and method |
| US11303842B2 (en) | 2018-12-20 | 2022-04-12 | Shenzhen Skyworth-Rgb Electronic Co., Ltd | Mini LED television control system and method |
| CN112578837A (en) * | 2020-12-07 | 2021-03-30 | 四川富肯斯科技有限公司 | Output voltage linear regulation circuit, method and device |
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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: 20080521 Termination date: 20140713 |
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| EXPY | Termination of patent right or utility model |