CA2950632A1 - Dual 0-10v/dali streetlighting controller - Google Patents
Dual 0-10v/dali streetlighting controller Download PDFInfo
- Publication number
- CA2950632A1 CA2950632A1 CA2950632A CA2950632A CA2950632A1 CA 2950632 A1 CA2950632 A1 CA 2950632A1 CA 2950632 A CA2950632 A CA 2950632A CA 2950632 A CA2950632 A CA 2950632A CA 2950632 A1 CA2950632 A1 CA 2950632A1
- Authority
- CA
- Canada
- Prior art keywords
- dimming
- dali
- signal
- control
- streetlight
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/175—Controlling the light source by remote control
- H05B47/18—Controlling the light source by remote control via data-bus transmission
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
A streetlight controller for a streetlight is provided. An isolation section coupled to a receptacle of the streetlight for receiving a control signal that is either 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal. A processor is connected to the isolation section, the processor detects if the control signal is a 0-10V dimming signal or DALI dimming signal and generates a control output to a light driver of the streetlight based on the detected control signal.
Description
2 TECHNICAL FIELD
[0001] The present disclosure relates to streetlight controllers and in particular to dimming controllers for streetlight fixtures.
BACKGROUND
[0002] There is a new mechanical interface for streetlight controls called ANSI 0136.41. A receptacle for streetlight fixtures is defined where there are two contact pads, one is a positive dimming contact, and one is a negative dimming contact, for interfacing with an external controller to control dimming of the light fixture. The dimming contacts can be wired to either 0-10V or Digital Addressable Lighting Interface (DALITM) such as defined in IEC 62386, however, this leads to the challenge that a streetlight manufacturer has to select if the driver will be wired to the receptacle for DALI or 0-10y at time of manufacture, even though it does not know if a the future controller applied to the streetlight will be DALI or 0-10V.
[0001] The present disclosure relates to streetlight controllers and in particular to dimming controllers for streetlight fixtures.
BACKGROUND
[0002] There is a new mechanical interface for streetlight controls called ANSI 0136.41. A receptacle for streetlight fixtures is defined where there are two contact pads, one is a positive dimming contact, and one is a negative dimming contact, for interfacing with an external controller to control dimming of the light fixture. The dimming contacts can be wired to either 0-10V or Digital Addressable Lighting Interface (DALITM) such as defined in IEC 62386, however, this leads to the challenge that a streetlight manufacturer has to select if the driver will be wired to the receptacle for DALI or 0-10y at time of manufacture, even though it does not know if a the future controller applied to the streetlight will be DALI or 0-10V.
[0003] Accordingly, an apparatus, system and method that enable an interchangeable dimming control of streetlights remain highly desirable.
BRIEF DESCRIPTION OF THE DRAWINGS
BRIEF DESCRIPTION OF THE DRAWINGS
[0004] Further features and advantages of the present disclosure will become apparent from the following detailed description, taken in combination with the appended drawings, in which:
FIG. 1 shows a block diagram a streetlight controller with 0-10V and DALI
interfaces;
FIG. 2 shows a system diagram of a 0-10V/DALI controller;
FIG. 3 shows a data flow diagram of 0-10V/DALI selection;
FIG. 4 shows a method of automatic detection 0-10V and DALI interfaces; and FIG. 5 shows another method of automatic detection 0-10V and DALI interfaces.
FIG. 1 shows a block diagram a streetlight controller with 0-10V and DALI
interfaces;
FIG. 2 shows a system diagram of a 0-10V/DALI controller;
FIG. 3 shows a data flow diagram of 0-10V/DALI selection;
FIG. 4 shows a method of automatic detection 0-10V and DALI interfaces; and FIG. 5 shows another method of automatic detection 0-10V and DALI interfaces.
[0005] It will be noted that throughout the appended drawings, like features are identified by like reference numerals.
DETAILED DESCRIPTION
DETAILED DESCRIPTION
[0006]
Embodiments are described below, by way of example only, with reference to Figs. 1-5.
Embodiments are described below, by way of example only, with reference to Figs. 1-5.
[0007] In accordance with an aspect of the present disclosure there is provided a method of streetlight control, the method comprising detecting a dimming control signal at a streetlight fixture; determining if the dimming control signal is a 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal; and converting the dimming control signal to a control output to control a light driver of the streetlight fixture based upon a determined type of the dimming control signal.
[0008] In accordance with another aspect of the present disclosure there is provided a streetlight controller for a streetlight comprising an isolation section coupled to a receptacle of the streetlight for receiving a control signal that is either 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal; and a processor connected to the isolation section, the processor for detecting if the control signal is a 0-10V dimming signal or DALI dimming signal and generating control output to a light driver of the streetlight based on the detected control signal.
[0009] The ANSI 0136.41 interface for streetlight receptacles allows either 10y or DALI dimming interfaces to be utilized. However the associated light fixture needs to be pre-configured for the specific interface. The light fixtures can accept lighting control modules such as light sensors, motion sensors, wireless control modules, photo electric (PE) sensors or environmental sensors. In order to avoid having to pre-configure a fixture, an intelligent controller is provided that allows either DALI or 0-10V (or 1-10y) controllers to be used with a fixture without pre-configuring. The controller, or daughter board, or driver provides automatic detection of the controller type and operates accordingly based on the signals coming across the DIM+ and DIM- lines of the ANSI 0136.41 receptacle. The control signals can be provided from a control interface or device such as a sensor or streetlight control system. The control interface may be a wireless interface receiving commands for controlling the light driver.
[0010] Figure 1 shows a block diagram of controller with 0-10V and DALI
interfaces. The controller 150 which may be implemented in a daughter board of a main controller, integrated in a controller, or integrated in a power supply.
The controller 150 is provided to interface between a receptacle and a power supply of a streetlight. The receptacle 100 has pads DIM+ 102 and DIM- 104 for interfacing with photo control cell or control interface which is inserted into the interface 100.
The connections from the receptacle are provided to a controller 150. An isolation circuit and signal conditioning section 152 is connected to common input connector and provides the isolation for both 0-10V and DALI control signals. An auto detection circuit 154 consists of a microcontroller, detects which control signals that are connected to DIM+ 102 and DIM- 104 contact points. DIM output controlling section (0-10y) 156 generates the reference analog voltage based on detected control signals (0-10y or DALI) which is provided to light driver 160. The controller 150 may alternatively be incorporated in the light driver or part of a control module.
interfaces. The controller 150 which may be implemented in a daughter board of a main controller, integrated in a controller, or integrated in a power supply.
The controller 150 is provided to interface between a receptacle and a power supply of a streetlight. The receptacle 100 has pads DIM+ 102 and DIM- 104 for interfacing with photo control cell or control interface which is inserted into the interface 100.
The connections from the receptacle are provided to a controller 150. An isolation circuit and signal conditioning section 152 is connected to common input connector and provides the isolation for both 0-10V and DALI control signals. An auto detection circuit 154 consists of a microcontroller, detects which control signals that are connected to DIM+ 102 and DIM- 104 contact points. DIM output controlling section (0-10y) 156 generates the reference analog voltage based on detected control signals (0-10y or DALI) which is provided to light driver 160. The controller 150 may alternatively be incorporated in the light driver or part of a control module.
[0011] Figure 2 shows a block diagram of interfaces of a 0-10V/DALI
streetlight controller. The controller has a processor or micro controller unit (MCU) 210, an input isolation section 230 for receiving a control signal, and 0-10V
generation section 240 for controlling light driver 260. The input isolation section 230 has a DALI transmit and receive circuit 232 which provides optical isolation of the control signal. The DALI interface requires isolation, which can be achieved using an opto-coupler. The DALI TX/RX circuit 232 interfaces with the DALI
stack 216 executed on the processor 210. An isolation transformer used for 0-10V
signal 222 of the input isolation circuit 230. DALI signal is detected using a receive pin of micro controller using DALI stack. 0-10y interface signal is detected with help of PWM 214 and ADC module 212 connected to 0-10V coupled to an isolator 234.
streetlight controller. The controller has a processor or micro controller unit (MCU) 210, an input isolation section 230 for receiving a control signal, and 0-10V
generation section 240 for controlling light driver 260. The input isolation section 230 has a DALI transmit and receive circuit 232 which provides optical isolation of the control signal. The DALI interface requires isolation, which can be achieved using an opto-coupler. The DALI TX/RX circuit 232 interfaces with the DALI
stack 216 executed on the processor 210. An isolation transformer used for 0-10V
signal 222 of the input isolation circuit 230. DALI signal is detected using a receive pin of micro controller using DALI stack. 0-10y interface signal is detected with help of PWM 214 and ADC module 212 connected to 0-10V coupled to an isolator 234.
[0012] For driving the 0-10V input, the input voltage, i.e., 0-10V is passed through a transformer which is driven by a 100 KHz PWM 214. This transformer steps down the 0-10V input voltage to almost around 1.2V (for 10V) which is in turn given to the ADC pin 212 of the processor 210. If DALI data is detected, then 100KHz PWM 214 is not generated, and therefore will not drive the transformer which in turn will not give any voltage reading on the ADC pin 214, thus indicating that the board is operating in DALI mode.
[0013] In the auto detection of DALI or 0-10V, the DALI Tx/Rx circuit is continuously monitored by the processor 210 for valid DALI signal. If valid DALI
signal is captured, then the mode is fixed to DALI mode and the 100 KHz PWM
generation is stopped. If valid DALI data is not captured, then the mode is switched to 0-10V mode and the 100 KHz PWM 214 is generated continuously.
signal is captured, then the mode is fixed to DALI mode and the 100 KHz PWM
generation is stopped. If valid DALI data is not captured, then the mode is switched to 0-10V mode and the 100 KHz PWM 214 is generated continuously.
[0014] 0-10V generation circuit 240 provides 0-10V using PWM 218 which may be part of the processor 210. The PWM 218 is converted to analog voltage and can be fed-back to processor 210 to provide a closed-loop system. This closed loop enables the processor 210 to understand whether required output is generated, otherwise it adjusts the duty cycle. The corresponding output is generated based on dimming input. The PWM 218 converts control output to analog voltage using digital to analog converter (DAC) 238 which drives the light driver 240. If control signal is DALI, the control output is mapped to DALI Arc levels. If its 0-10y input, the control output output will be mapped to input voltage. The control output may be an analog voltage or a digital command or voltage level for controlling the driver.
[0015] FIG. 3 is a dataflow diagram of the controller. An input 310 is received by the processor 210. The DALI tx/rx circuit 232 passes the control signal to the processor 210 if a DALI signal is present by detecting a DALI interrupt service routine 320. If a DALI signal is detected return DALI communication can be provided 322 back to the command source. If a DALI signal is not detected PWM
driver generates an 100KHZ PWM 326 to drive the transformer in isolator 234 to generate a voltage reading on the ADC pin 212 via ADC driver 324, thus indicating that operation is 0-10y dimming. The DALI command or the voltage reading can then be converted by DAC 330 to LED driver 340.
driver generates an 100KHZ PWM 326 to drive the transformer in isolator 234 to generate a voltage reading on the ADC pin 212 via ADC driver 324, thus indicating that operation is 0-10y dimming. The DALI command or the voltage reading can then be converted by DAC 330 to LED driver 340.
[0016] Figure 4 is a flowchart of a method 400 for automatic detection of 0-10V and DALI interfaces. The system is initialized (402) on start-up of the controller, hardware change or power failure. If a DALI interrupt is detected (YES at 404) the received data is checked for DALI data (YES at 406) then the controller is set for DALI mode (408). Received DALI commands are then processed (410). Control or query commands can be responded to (412) and the received DALI dimming level can be mapped as per arc level to control level for the LED driver (422) by generating PWM output. If DALI data is not received (NO at 406) the data is processed as long as an interrupt it received (404). If a DALI interrupt is not received (NO at 404) 0-10V dimming mode is utilized (414). PWM output is generated (416) to drive a transformer to allow voltage which can then be read at ADC pin (418). The received voltage is mapped to PWM output setting (420) to generate a PWM output (422) and converted by DAC to an analog level to control voltage to adjust the output of the LED driver. Although an analog output is described a digital output may be utilized by a light driver. If digital output is utilized the DALI or 0-10V level would be mapped to a digital value which would be provided to the light driver. The driver may be an light emitting diode (LED) based driver or any light driver which accepts a 0-10V or PWM input for dimming if a daughter board is used to interface with the controller.
[0017] The controller described may be implemented as a standalone component or integrated in a daughter card of a controller, a controller or in an driver. The control signals provided to the driver may be an analog voltage or may be a digital command or level mapped to a light output of the driver.
[0018] Figure 5 shows a method (500) automatic detection 0-10V and DALI
interfaces. A dimming control signal is determined at a streetlight fixture (502). It is then determined if the dimming control signal is a 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal (504). The dimming control signal is converted to a control output to control a light driver of the streetlight fixture based upon the determined type of the dimming control signal (506).
interfaces. A dimming control signal is determined at a streetlight fixture (502). It is then determined if the dimming control signal is a 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal (504). The dimming control signal is converted to a control output to control a light driver of the streetlight fixture based upon the determined type of the dimming control signal (506).
[0019] Each element in the embodiments of the present disclosure may be implemented as hardware, software/program, or any combination thereof.
Software codes, either in its entirety or a part thereof, may be stored in a computer readable medium or memory (e.g., as a ROM, for example a non-volatile memory such as flash memory, CD ROM, DVD ROM, Blu-rayTM, a semiconductor ROM, USB, or a magnetic recording medium, for example a hard disk). The program may be in the form of source code, object code, a code intermediate source and object code such as partially compiled form, or in any other form.
Software codes, either in its entirety or a part thereof, may be stored in a computer readable medium or memory (e.g., as a ROM, for example a non-volatile memory such as flash memory, CD ROM, DVD ROM, Blu-rayTM, a semiconductor ROM, USB, or a magnetic recording medium, for example a hard disk). The program may be in the form of source code, object code, a code intermediate source and object code such as partially compiled form, or in any other form.
[0020] It would be appreciated by one of ordinary skill in the art that the system and components shown in Figures 1-5 may include components not shown in the drawings. For simplicity and clarity of the illustration, elements in the figures are not necessarily to scale, are only schematic and are non-limiting of the elements structures. It will be apparent to persons skilled in the art that a number of variations and modifications can be made without departing from the scope of the invention as defined in the claims.
Claims (22)
1. A method of streetlight control, the method comprising:
detecting a dimming control signal at a streetlight fixture;
determining if the dimming control signal is a 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal; and converting the dimming control signal to a control output to control a light driver of the streetlight fixture based upon a determined type of the dimming control signal.
detecting a dimming control signal at a streetlight fixture;
determining if the dimming control signal is a 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal; and converting the dimming control signal to a control output to control a light driver of the streetlight fixture based upon a determined type of the dimming control signal.
2. The method of claim 1 wherein detecting the dimming control signal comprises determining if a DALI interrupt is received.
3. The method of claim 2 wherein DALI commands are mapped to an arc level which is converted to the control output to be provided to the light driver.
4. The method of claim 1 wherein an analog to digital converter (ADC) receives a 0-10V dimming signal to determine the control output.
5. The method of claim 4 wherein a pulse width modulator (PWM) provides a signal to a transformer to allow the dimming control signal to be received by the ADC.
6. The method of claim 5 wherein the control signal is mapped to a control output and provided to the light driver.
7. The method of claim 3 or 6 wherein the control output is generated by a PWM and converted by a digital to analog converter (DAC) and provided to the light driver.
8. The method of any one of claims 1 to 7 wherein a receptacle providing the control signal is an ANSI C136.41 interface capable of receiving 0-10V or DALI control devices.
9. The method of any one of claims 1 or 8 wherein the light driver is an light emitting diode (LED) light driver.
10. The method of any one of claims 1 or 8 wherein the light driver accepts a 0-10V or PWM input for dimming.
11. The method of any one of claims 1 to 9 wherein a receptacle providing the dimming control signal has pads two or more dimming pads.
12. A streetlight controller for a streetlight comprising:
an isolation section coupled to a receptacle of the streetlight for receiving a control signal that is either 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal; and a processor connected to the isolation section, the processor for detecting if the control signal is a 0-10V dimming signal or DALI dimming signal and generating control output to a light driver of the streetlight based on the detected control signal.
an isolation section coupled to a receptacle of the streetlight for receiving a control signal that is either 0-10V dimming signal or a Digital Addressable Lighting Interface (DALI) dimming signal; and a processor connected to the isolation section, the processor for detecting if the control signal is a 0-10V dimming signal or DALI dimming signal and generating control output to a light driver of the streetlight based on the detected control signal.
13. The streetlight controller of claim 12 further comprising:
a dimmer output controlling section for converting the 0-10V or DALI control signal to a control output to control the light driver.
a dimmer output controlling section for converting the 0-10V or DALI control signal to a control output to control the light driver.
14. The streetlight controller of claims 12 or 13 wherein DALI commands are mapped by the processor to an arc level which is converted to the control output to be provided to the light driver.
15. The streetlight controller of any one of claims 12 to 14 wherein an analog to digital converter (ADC) associated with the processor receives a 0-10V
dimming signal from the isolation section to determine the control output.
dimming signal from the isolation section to determine the control output.
16. The streetlight controller of claim 15 wherein a pulse width modulator (PWM) provides a signal to a transformer in the isolation section to allow the dimming control signal to be received by the ADC for 0-10V dimming signal detection.
17. The streetlight controller of claim 16 wherein the control signal is mapped to a control output and provided to the light driver.
18. The streetlight controller of any one of claims 15 to 17 wherein the control output is generated by a PWM and converted by a digital to analog converter (DAC) and provided to the light driver.
19. The streetlight controller of any one of claims 12 to 18 wherein the receptacle is an ANSI 0136.41 interface capable of receiving 0-10V or DALI
control devices.
control devices.
20. The streetlight controller of any one of claims 12 or 19 wherein the light driver is an light emitting diode (LED) light driver.
21. The streetlight controller of any one of claims 12 to 20 wherein the receptacle two or more dimming pads.
22. The streetlight controller of any one of claims 12 to 20 wherein the light driver accepts a 0-10V or PWM input for dimming.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US201562107146P | 2015-01-23 | 2015-01-23 | |
US62/107,146 | 2015-01-23 | ||
PCT/CA2016/050058 WO2016115642A1 (en) | 2015-01-23 | 2016-01-25 | Dual 0-10v/dali streetlighting controller |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2950632A1 true CA2950632A1 (en) | 2016-07-28 |
CA2950632C CA2950632C (en) | 2017-10-17 |
Family
ID=56416235
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2950632A Expired - Fee Related CA2950632C (en) | 2015-01-23 | 2016-01-25 | Dual 0-10v/dali streetlighting controller |
Country Status (2)
Country | Link |
---|---|
CA (1) | CA2950632C (en) |
WO (1) | WO2016115642A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020180841A1 (en) * | 2019-03-05 | 2020-09-10 | Bridgelux, Inc. | Drivers with simplified connectivity for controls |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108696971B (en) * | 2017-04-07 | 2024-02-20 | 上海鸣志自动控制设备有限公司 | Control method of control system compatible with DALI and PWM dimming interface |
WO2023221957A1 (en) * | 2022-05-20 | 2023-11-23 | 苏州欧普照明有限公司 | Lighting system controller, track, and lighting system |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8072164B2 (en) * | 2008-10-28 | 2011-12-06 | General Electric Company | Unified 0-10V and DALI dimming interface circuit |
EP2604095B8 (en) * | 2010-08-12 | 2018-04-25 | eldoLAB Holding B.V. | Interface circuit for a lighting device |
US8319452B1 (en) * | 2012-01-05 | 2012-11-27 | Lumenpulse Lighting, Inc. | Dimming protocol detection for a light fixture |
-
2016
- 2016-01-25 WO PCT/CA2016/050058 patent/WO2016115642A1/en active Application Filing
- 2016-01-25 CA CA2950632A patent/CA2950632C/en not_active Expired - Fee Related
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2020180841A1 (en) * | 2019-03-05 | 2020-09-10 | Bridgelux, Inc. | Drivers with simplified connectivity for controls |
US11006492B2 (en) | 2019-03-05 | 2021-05-11 | Bridgelux, Inc. | Drivers with simplified connectivity for controls |
US11265984B2 (en) | 2019-03-05 | 2022-03-01 | Bridgelux, Inc. | Drivers with simplified connectivity for controls |
US11564294B2 (en) | 2019-03-05 | 2023-01-24 | Bridgelux, Inc. | Drivers with simplified connectivity for controls |
Also Published As
Publication number | Publication date |
---|---|
WO2016115642A1 (en) | 2016-07-28 |
CA2950632C (en) | 2017-10-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
CN102598855B (en) | Lighting apparatus | |
US8604712B2 (en) | LED luminaires power supply | |
EP3261411B1 (en) | Driver system for a light emitting device | |
TWI528856B (en) | Led dimming driver | |
US8779695B2 (en) | Method of configuring an LED driver, LED driver, LED assembly and method of controlling an LED assembly | |
EP2425682B1 (en) | Calibration of lamps using power line communication for sending calibration data | |
JP2009170240A (en) | Dimming device of light-emitting diode | |
JP2014524130A (en) | System and method for performing dimming based on main power signal of solid state lighting module | |
US9345093B2 (en) | Line voltage switch event detection for LED assemblies | |
JP2014110244A (en) | Led lighting apparatus, current regulator for the same, and current regulating method | |
CA2950632C (en) | Dual 0-10v/dali streetlighting controller | |
CN102458014A (en) | Light source control method, device and system | |
US20140125242A1 (en) | Illumination system | |
US9967938B2 (en) | Solid state light source device and dimming circuit thereof | |
CN111918447B (en) | Self-adaptive dimming driving system | |
US9307606B2 (en) | Light emitting device driver circuit and control circuit and control method thereof | |
KR20120010415A (en) | Power supply and lighting system having the same | |
EP3393209B1 (en) | A system for regulating the minimum output current of an led dimming power supply | |
TW201743659A (en) | Modular light control device and dimming control system | |
CN102648663B (en) | For the driver of solid state lamp | |
KR101956724B1 (en) | Apparatus for controlling dimming of led lighting device | |
JP2016058240A (en) | Light emission element lighting device, light emission module and luminaire | |
KR101964628B1 (en) | Apparatus for controlling led lights without supplemental dimming wires and the control method thereof | |
CN204145832U (en) | A kind of LED light modulating device | |
CN103327700A (en) | Power control method for LED (light-emitting diode) drive power supply |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
EEER | Examination request |
Effective date: 20161129 |
|
MKLA | Lapsed |
Effective date: 20210125 |