CN201623897U - LED current control device - Google Patents
LED current control device Download PDFInfo
- Publication number
- CN201623897U CN201623897U CN2010201235425U CN201020123542U CN201623897U CN 201623897 U CN201623897 U CN 201623897U CN 2010201235425 U CN2010201235425 U CN 2010201235425U CN 201020123542 U CN201020123542 U CN 201020123542U CN 201623897 U CN201623897 U CN 201623897U
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- CN
- China
- Prior art keywords
- led
- pwm
- current
- circuit
- pwm signal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
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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
Abstract
The utility model discloses an LED current control device, comprising a plurality of paths of LED circuits, wherein each path of LED circuit comprises a plurality of LEDs arranged in serial, a PWM current source device used for controlling the current flowing through the LEDs, and a PWM signal input module; and the duty time of the PWM signals input by the PWM signal input modules of the paths of LED circuits is arranged in a staggered manner. The design of the circuit leads the efficiency of the LED illuminating device to be improved, and adopts PWM input signals with staggered duty ratio to control the plurality of LED circuits, thus achieving the brightness effect in entire opening of LED power with less electricity energy output.
Description
Technical field
The utility model relates to a kind of LED current control device.
Background technology
LED (light-emitting diode) has that energy consumption is low, caloric value is lower and the advantage of long service life, and in today of global energy shortage, the above-mentioned environmental protection characteristics of LED have wide application space.A kind of PWM (pulse-width modulation) dimming mode that is is arranged in the regulative mode to LED brightness, pwm signal can be produced by cpu controller, also can produce by other pulse signal, the pwm signal may command changes to the normal current state by the electric current of LED lamp from 0, can make the LED lamp from secretly becoming normal brightness, duty ratio big more (high level time is long), the LED brighter display.
Summary of the invention
The utility model purpose provides a kind of LED current control device, with the efficient of further raising LED lighting device, saves energy.
The technical solution of the utility model is: a kind of LED current control device, comprise the several led circuit, described every paths of LEDs circuit comprises the PWM current-source arrangement and the pwm signal input module of some LED that series connection is provided with, electric current that control flows is crossed LED, the setting of staggering of the duty time of the pwm signal of the pwm signal input module input of each paths of LEDs circuit.Because the frequency of PWM is very high, its duty time is very short, be second level substantially, so the flicker of LED when this duty pulse can not perceived by human eye.The setting because the duty time of the pwm signal of LED multi-path circuit staggers, so the duty time of paths of LEDs circuit PWM signal place therein, other paths of LEDs circuit is with normal power supply.When N paths of LEDs circuit was arranged, at the duty of a certain led circuit during the time, the consumed power of whole led circuits reduced 1/N during than total power, but the brightness of LED lighting device give human eye feel with full power operation the time the same.From the light efficiency angle, such power supply control makes the efficient of LED lighting device further improve.
Further, in above-mentioned LED current control device, the duty time of importing the pwm signal of described LED multi-path circuit respectively is to stagger continuously successively to be provided with.Promptly when the duty time of last paths of LEDs circuit had just finished, the duty time of next paths of LEDs circuit just in time began as relay.So begin this section of finishing to duty time of a last circuit in the continuous period in the duty time from first circuit, power supply lack the electric energy of 1/N when output is than full power operation continuously, the power of power supply is exported also more stable in the period at this section.
Further, in above-mentioned LED current control device, described PWM current-source arrangement comprises the Converter Controlled by Current mode PWM device.This Converter Controlled by Current mode PWM device can be existing Converter Controlled by Current mode PWM device chip on the market.
The utility model advantage is:
1, circuit design of the present utility model makes the efficient of LED lighting device improve, and adopts the PWM input signal of the duty ratio that staggers that the electric current of LED multi-path circuit is controlled, the brightness effects when reaching LED power standard-sized sheet with less electric energy output.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model specific embodiment;
Fig. 2 is the timing chart of the utility model specific embodiment multi-channel PWM control signal.
Wherein: the 1LED circuit; The 2PWM current-source arrangement; 21 Converter Controlled by Current mode PWM devices; The 22PWM pressure unit; The 3PWM signal input module; 4LED.
Embodiment
Below in conjunction with drawings and Examples the utility model is further described:
Embodiment: as depicted in figs. 1 and 2, a kind of LED current control device, comprise five paths of LEDs circuit 1 (two-way only is shown among Fig. 1), described every paths of LEDs circuit 1 comprises that 16 white light LEDs 4, control flows that series connection is provided with cross the PWM current-source arrangement 2 and the pwm signal input module 3 of the electric current of LED4, the setting of staggering of the duty time of the pwm signal of pwm signal input module 3 inputs of each paths of LEDs circuit 1.Wherein the frequency of pwm signal is 10khz.
The duty time of importing the pwm signal of described LED multi-path circuit 1 respectively is to stagger continuously successively to be provided with, as shown in Figure 2.Make like this to begin to account in the continuous time of whole pulse period 50% that power supply is only exported electric energy with 90% of total power power supply to this section that the duty time of the 5th paths of LEDs circuit finishes in the duty time of first via led circuit.
Described PWM current-source arrangement 2 comprises Converter Controlled by Current mode PWM device 21, and it has six effective pins: operating voltage input pin V
DD, ground pin GND, frequency of oscillation be provided with end RI, feedback input end FB, switched-current sampled end Sense and grid drive output Gate.As shown in Figure 1, in the present embodiment, supply voltage U
ABe+48V, it is connected to the operating voltage input pin V of Converter Controlled by Current mode PWM device 21 after through 22 step-downs of PWM pressure unit
DDThe grid drive output Gate of PWM controller 21 connects the grid of a field effect transistor Q1, pwm signal input module 3 also is connected to the source electrode of above-mentioned field effect transistor Q1 simultaneously by switched-current sampled end Sense sampling, the end of the drain electrode of field effect transistor Q1 and LED4 conducts, another termination supply voltage U of LED4
AFor the LED of 1W, be 0.35A by its electric current, the voltage at its two ends is 48-0.35V, the power that every paths of LEDs circuit 1 consumes is 0.35A * 48V=16.8W; Most effective can be (48V-0.35V)/48V=99.3% of L ED4.
Again by the input pwm signal of duty time that staggers to five paths of LEDs circuit 1, make illuminating effect when circuit just reaches the total power power supply with littler electric energy input, further improve the actual illumination efficient of LED lighting device.
For the LED street lamp of 200W, can adopt six road 2W LED, wherein the electric current of 2WLED is 0.7A, the power that every road consumes is 0.7A * 48V=33.6W, needs 16 * 6=96 white light LEDs 4 altogether.
Circuit design of the present utility model makes the efficient of LED lighting device improve, and adopts the PWM input signal of the duty ratio that staggers that the electric current of LED multi-path circuit is controlled, the brightness effects when reaching LED power standard-sized sheet with less electric energy output.
Claims (3)
1. LED current control device, it is characterized in that: comprise several led circuit (1), described every paths of LEDs circuit (1) comprises that some LED (4), control flows that series connection is provided with cross the PWM current-source arrangement (2) and the pwm signal input module (3) of the electric current of LED (4), the setting of staggering of the duty time of the pwm signal of pwm signal input module (3) input of each paths of LEDs circuit (1).
2. LED current control device according to claim 1 is characterized in that: the duty time of importing the pwm signal of described LED multi-path circuit (1) respectively is to stagger continuously successively to be provided with.
3. LED current control device according to claim 1 is characterized in that: described PWM current-source arrangement (2) comprises Converter Controlled by Current mode PWM device (21).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201235425U CN201623897U (en) | 2010-01-29 | 2010-01-29 | LED current control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201235425U CN201623897U (en) | 2010-01-29 | 2010-01-29 | LED current control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201623897U true CN201623897U (en) | 2010-11-03 |
Family
ID=43027349
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201235425U Expired - Fee Related CN201623897U (en) | 2010-01-29 | 2010-01-29 | LED current control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201623897U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113315357A (en) * | 2021-04-20 | 2021-08-27 | 山东奥太电气有限公司 | High-power inverter power supply phase-dislocation control system and method |
| WO2022120677A1 (en) * | 2020-12-07 | 2022-06-16 | 南京奥视威电子科技股份有限公司 | Led lighting circuit, temporal dimmer circuit and control method based on pwm |
-
2010
- 2010-01-29 CN CN2010201235425U patent/CN201623897U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022120677A1 (en) * | 2020-12-07 | 2022-06-16 | 南京奥视威电子科技股份有限公司 | Led lighting circuit, temporal dimmer circuit and control method based on pwm |
| CN113315357A (en) * | 2021-04-20 | 2021-08-27 | 山东奥太电气有限公司 | High-power inverter power supply phase-dislocation control system and method |
| CN113315357B (en) * | 2021-04-20 | 2022-06-14 | 山东奥太电气有限公司 | High-power inverter power supply phase-dislocation control system and method |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20130129 |