EP3879934A1 - Circuit de commande de del, dispositif de commande de del et lampe - Google Patents
Circuit de commande de del, dispositif de commande de del et lampe Download PDFInfo
- Publication number
- EP3879934A1 EP3879934A1 EP21155270.8A EP21155270A EP3879934A1 EP 3879934 A1 EP3879934 A1 EP 3879934A1 EP 21155270 A EP21155270 A EP 21155270A EP 3879934 A1 EP3879934 A1 EP 3879934A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- module
- capacitor
- constant current
- diode
- current drive
- 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
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- 239000003990 capacitor Substances 0.000 claims abstract description 85
- 230000000694 effects Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Images
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]
- H05B45/30—Driver circuits
-
- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
- H05B45/59—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits for reducing or suppressing flicker or glow effects
-
- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
- H05B45/3725—Switched mode power supply [SMPS]
- H05B45/385—Switched mode power supply [SMPS] using flyback topology
Definitions
- the present invention relates to the technical field of LED driving, and more particularly to an LED drive circuit, an LED drive device and a lamp.
- LED light sources in lighting applications have gradually become prominent.
- traditional light sources such as incandescent lamps and gas discharge fluorescent lamps.
- adjustable ability has more space for development than the traditional light sources and is especially suitable for the general lighting field such as modern household and commerce.
- the lamps realized by the LED light source also have obvious defects. Considering the semiconductor device with LED light source output, the driving power supply of which usually requires low voltage, thus a corresponding driver will be provided to the LED lamp.
- embodiments of the present application provide an LED drive circuit, an LED drive device, and a lamp, aiming to solve the problem of afterglow effect of the light source module caused by the current leakage in the current LED drive circuit during a standby state.
- the first aspect of the present application provides an LED drive circuit, the LED drive circuit includes:
- the LED drive circuit further includes a filter module, which is connected to the constant current drive module, and is configured to receive the constant current drive signal and filter the constant current drive signal.
- a filter module which is connected to the constant current drive module, and is configured to receive the constant current drive signal and filter the constant current drive signal.
- the switch module is any one of a MOS transistor, a triode, and a relay.
- the rectifier module includes a fuse, a first capacitor, a first diode, a second diode, a third diode and a fourth diode; where a first end of the fuse serves as a first input end of the rectifier module, a second end of the fuse, a cathode of the first diode and an anode of the third diode are connected in common, a cathode of the third diode, a cathode of the fourth diode and a first end of the first capacitor are connected in common and serves as a first output end of the rectifier module, a cathode of the second diode and an anode of the fourth diode are connected in common and serves as a second input end of the rectifier module, and an anode of the second diode, an anode of the first diode, and a second end of the first capacitor are connected in common and serves as a second output end of the rectifier module.
- the constant current drive module includes a first switch tube and a transformer, where a first input end of the transformer serves as a first input end of the constant current drive module and is connected to a first output end of the rectifier module, a second input end of the transformer is connected to a current input end of the first switch tube, a current output end of the first switch tube serves as a second input end of the constant current drive module and is connected to a second output end of the rectifier module, a control end of the first switch tube serves as a control end of the constant current drive module, a first output end of the transformer serves as a first output end of the constant current drive module, and a second output end of the transformer serves as a second output end of the constant current drive module.
- the filtering module includes a fifth diode and a second capacitor, where an anode of the fifth diode severs as a first end of the filter module and is connected to a first output end of the constant current drive module, a cathode of the fifth diode and a first end of the second capacitor are connected in common and serves as a second end of the filter module, and a second end of the second capacitor serves as a third end of the filter module and is connected to a second output end of the constant current drive module.
- the switch control module includes a sixth diode, a third capacitor, a first resistor and a second resistor; where an anode of the sixth diode serves as a first end of the switch control module and is connected to a first output end of the constant current drive module, a cathode of the sixth diode, a first end of the third capacitor and a first end of the first resistor are connected in common, a second end of the third capacitor and a first end of the second resistor are connected in common to serve as a second end of the switch control module and is further connected to a second output end of the constant current drive module, a second end of the first resistor and a second end of the second resistor are connected in common to serve as a third end of the switch control module and is further connected to a control end of the switch module.
- the capacitor module includes a first safety capacitor and a second safety capacitor; where a first end of the first safety capacitor serves as a first end of the capacitor module and is connected to a first output end of the rectifier module, a first end of the second safety capacitor serves as a second end of the capacitor module and is connected to a second output end of the rectifier module, a second end of the first safety capacitor and a second end of the second safety capacitor are connected in common to serve as a third end of the capacitor module and is further connected to a first end of the switch module.
- the second aspect of the embodiments of the present application also provides an LED drive device, which includes the LED drive circuit described in any one of the above solutions.
- the third aspect of the embodiments of the present application also provides a lamp, and the lamp includes:
- the embodiments of the present application provide an LED drive circuit, an LED drive device, and a lamp.
- the AC voltage is converted into a DC voltage through a rectifier circuit
- a constant current drive module is provided to receive the drive control signal and the DC voltage, and generate a constant current drive signal according to the drive control signal and the DC voltage
- a switch control module is provided to generate a switch control signal according to the constant current drive signal to control On or Off of the switch module, so that a leakage current of the capacitor loop formed by the capacitor module is reduced, thereby solving the problem of afterglow effect of the light source module caused by the current leakage in the current LED drive circuits during a standby state.
- first and second are merely used for illustration purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of these features. In the description of this application, “multiple” or “a plurality of' means two or more than two, unless otherwise specifically defined.
- the LED drive circuit in the embodiment of the present application includes a rectifier module 40, a constant current drive module 50, a switch control module 60, a switch module 70 and a capacitor module 80.
- the rectifier module 40 is configured to convert a received AC voltage into a DC voltage
- the constant current drive module 50 is connected to the rectifier module 40, and is configured to receive the drive control signal and the DC voltage, and generate a constant current drive signal based on the drive control signal and the DC voltage.
- the switch control module 60 is connected to the constant current drive module 50 and is configured to collect the constant current drive signal and generate a switch control signal according to the constant current drive signal.
- the switch module 70 is connected to the switch control module 60 is configured to receive the switch control signal and turn on or off according to the switch control signal.
- the capacitor module 80 is connected to the switch module 70 and the rectifier module 40 respectively.
- the switch control module 60 is configured to detect the constant current drive signal output from the constant current drive module 50, and generate a corresponding switch control signal based on the detection result.
- the switch control signal is configured to control the On and Off of the switch module so as to control the On and Off of the capacitor loop formed by the capacitor module 80, so that the leakage current of the capacitor circuit can be reduced by turning off the switch module 70 when the constant current drive module enters the standby state, which solves the problem of afterglow effect of the light source module during a standby state.
- the rectifier module 40 two input ends of which are respectively connected to two output ends of the power supply 20, and is configured to convert the AC voltage provided by the power supply 20 into a DC voltage
- the constant current drive module 50 is configured to receive the drive control signal provided by the control module 10 to control the output current of the constant current drive signal.
- the drive control signal is a standby signal
- the constant current drive module 50 enters a standby mode.
- the constant current drive module 50 stops output, the switch control module 60 collects a low level signal, and sends the corresponding switch control signal to the switch module 70 to control the switch module 70 to be switched off so as to turn off the capacitor circuit formed by the capacitor module 80, thereby reducing the leakage current of the capacitor circuit, and solving the problem of afterglow effect of the light source model 30 during the standby state.
- the LED drive circuit further includes a filter module 90, which is connected to the constant current drive module 50, and configured to receive the constant current drive signal and filter the constant current drive signal.
- the switch module 70 may be one of a MOS transistor, a triode and a relay.
- the switch module 70 is a MOS transistor Q2.
- a first end and a second end of the MOS transistor Q2 are respectively connected to the capacitor module 80 and the constant current drive module 50, and a control end of the MOS transistor Q2 is connect to the switch control module 60.
- the MOS transistor Q2 may be a P-type MOS transistor.
- the rectifier module 40 includes a fuse FR1, a first capacitor C1, a first diode D1, a second diode D2, a third diode D3 and a fourth diode D4.
- a first end of the fuse FR1 serves as a first input end of the rectifier module 40.
- a second end of the fuse FR1, a cathode of the first diode D1 and an anode of the third diode D3 are connected in common.
- a cathode of the third diode D3, a cathode of the fourth diode D4 and a first end of the first capacitor C1 are connected in common and serves as a first output end the rectifier module 40.
- a cathode of the second diode D2 and an anode of the fourth diode D4 are connected in common and serves as a second input end of the rectifier module 40.
- An anode of the second diode D2, an anode of the first diode D1 and a second end of the first capacitor C1 are connected in common and serves as a second output end of the rectifier module 40.
- the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 constitute a rectifier bridge, which rectifies the AC voltage provided by the power supply 20, and filter the rectified DC voltage with the voltage capacitor C1.
- the constant current drive module 50 includes a first switch tube Q1 and a transformer T1.
- a first input end of the transformer T1 serves as a first input end of the constant current drive module 50 and is connected to the first output end of the rectifier module 40.
- a second input end of the transformer T1 is connected to a current input end of the first switch tube Q1.
- a current output end of the first switch tube Q1 serves as a second input end of the constant current drive module 50 and is connected to the second output end of the rectifier module 40.
- a control end of the first switch tube Q1 serves as a control end of the constant current drive module 50
- a first output end of the transformer T1 serves as a first output end of the constant current drive module 50
- a second output end of the transformer T1 serves as a second output end of the constant current drive module 50.
- control end of the first switch tube Q1 is configured to receive a drive control signal, which controls the current of the constant current drive signal output by the rectifier drive module 50 by controlling the switch frequency of the first switch tube Q1.
- the first switch tube Q1 maybe an N-type MOS transistor.
- the filter module 90 includes a fifth diode D5 and a second capacitor C2.
- an anode of the fifth diode D5 serves as a first end of the filter module 90 and is connected to the first output end of the constant current drive module 50.
- a cathode of the fifth diode D5 and a first end of the second capacitor C2 are connected in common and serves as the second end of the filter module 90.
- a second end of the second capacitor C2 serves as a third end of the filter module 90 and is connected to the second output end of the constant current drive module 50.
- the constant current drive signal output by the constant current drive module 50 is further filtered through the filter circuit constituted with the fifth diode D5 and the second capacitor C2.
- the switch control module 60 includes a sixth diode D6, a third capacitor C3, a first resistor R1, and a second resistor R2.
- an anode of the sixth diode D6 serves as a first end of the switch control module 60 and is connected to the first output end of the constant current drive module 50.
- a cathode of the sixth diode D6, a first end of the third capacitor C3 and a first end of the first resistor R1 are connected in common.
- a second end of the third capacitor C3 and a first end of the second resistor R2 are connected in common to serve as a second end of the switch control module 60 and is connected to the second output end of the constant current drive module 50.
- a second end of the first resistor R1 and a second end of the second resistor R2 are connected in common to serve as a third end of the switch control module 60 and is connect to a control end of the switch module 70.
- the switch control circuit constituted with the sixth diode D6, the third capacitor C3, the first resistor R1 and the second resistor R2 has an advantage of short response time.
- the first resistor R1 and the second resistor R1 R2 form a voltage divider circuit, which is used to divide the voltage of the constant current drive signal and generate the corresponding switch control signal.
- the switch control signal is a high level signal, and the switch module 70 turns on at this time.
- the switch control signal is a low level signal, and the switch module 70 turns off at this time.
- the capacitor module 80 includes a first safety capacitor CY1 and a second safety capacitor CY2.
- a first end of the first safety capacitor CY1 serves as a first end of the capacitor module 80 and is connected to the first output end of the rectifier module 40.
- a first end of the second safety capacitor CY2 serves as a second end of the capacitor module 80 and is connected to the second output end of the rectifier module 40.
- a second end of the first safety capacitor CY1 and a second end of the second safety capacitor CY2 are connected in common to serve as a third end of the capacitor module 80 and is connected to a first end of the switch module 70.
- the first end of the switch module 70 is connected to the third end of the capacitor module, a second end of the switch module 70 is connected to the light source module 30, and the control end of the switch module 70 is connected to the switch control module 60 configured to receive the switch control signal and control a connection state of the first end and the second end of the switch module 70 based on the switch control signal.
- the second end of the first safety capacitor CY1 and the second end of the second safety capacitor CY2 are connected in common to the first end of the switch module 70.
- An embodiment of the present application also provides an LED drive device, which includes the LED drive circuit described in any one of the above embodiments.
- the embodiment of the present application also provides a lamp.
- the lamp in this embodiment includes a control module 10, a light source module 30 and the LED drive circuit according to any one of the above embodiments, the LED drive circuit is connected to the control module and the light source module, respectively.
- the control module 10 is configured to send a drive control signal to the constant current drive module 50 to adjust the constant current drive signal, so that the light source module 30 is dimmed and toned.
- the light source module 30 may be a light emitting diode string.
- the embodiments of the present application provide an LED drive circuit, an LED drive device and a lamp.
- the AC voltage is converted into a DC voltage through a rectifier circuit.
- a constant current drive module is provided to receive a drive control signal and the DC voltage, and generate a constant current drive signal based on the drive control signal and DC voltage.
- a switch control module is provided to generate a switch control signal according to the constant current drive signal to control On or Off of the switch module, so that the leakage current of the capacitor loop formed by the capacitor module is reduced, thereby solving the problem of afterglow effect of the light source module caused by the current leakage in current LED drive circuit during a standby state.
- the above-mentioned functions can be allocated to different functional units and modules as required. That is, the internal structure of the device may be divided into different functional units or modules to complete all or part of the functions described above.
- the functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist alone physically, or two or more units can be integrated into one unit.
- the above-mentioned integrated units can be realized in the form of hardware, and can also be realized in the form of software functional unit.
- the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments of the present application.
- the functional units in the various embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
- the above-mentioned integrated unit can be realized in the form of hardware or software functional unit.
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN202020292232.XU CN211930917U (zh) | 2020-03-11 | 2020-03-11 | 一种led驱动电路、led驱动装置及灯具 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3879934A1 true EP3879934A1 (fr) | 2021-09-15 |
EP3879934B1 EP3879934B1 (fr) | 2024-01-03 |
Family
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Application Number | Title | Priority Date | Filing Date |
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EP21155270.8A Active EP3879934B1 (fr) | 2020-03-11 | 2021-02-04 | Circuit de commande de del, dispositif de commande de del et lampe |
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EP (1) | EP3879934B1 (fr) |
CN (1) | CN211930917U (fr) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114364097A (zh) * | 2021-09-26 | 2022-04-15 | 杰华特微电子股份有限公司 | 用于led驱动电路的缓冲电路、led驱动电路及其控制方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160073471A1 (en) * | 2013-05-02 | 2016-03-10 | Tridonic Gmbh & Co Kg | Operating Device for Luminous Elements |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
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KR101768179B1 (ko) * | 2017-03-13 | 2017-08-16 | 태석정공 주식회사 | 엘이디 램프의 소등 지연 및 잔광 방지장치 |
CN110213856A (zh) * | 2019-06-06 | 2019-09-06 | 矽力杰半导体技术(杭州)有限公司 | 调光电路和方法 |
-
2020
- 2020-03-11 CN CN202020292232.XU patent/CN211930917U/zh active Active
-
2021
- 2021-02-04 EP EP21155270.8A patent/EP3879934B1/fr active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20160073471A1 (en) * | 2013-05-02 | 2016-03-10 | Tridonic Gmbh & Co Kg | Operating Device for Luminous Elements |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114364097A (zh) * | 2021-09-26 | 2022-04-15 | 杰华特微电子股份有限公司 | 用于led驱动电路的缓冲电路、led驱动电路及其控制方法 |
CN114364097B (zh) * | 2021-09-26 | 2023-10-27 | 杰华特微电子股份有限公司 | 缓冲电路、led驱动电路及其控制方法 |
Also Published As
Publication number | Publication date |
---|---|
EP3879934B1 (fr) | 2024-01-03 |
CN211930917U (zh) | 2020-11-13 |
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