EP3813489A1 - Mehrwege-led-treiberschaltung - Google Patents

Mehrwege-led-treiberschaltung Download PDF

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Publication number
EP3813489A1
EP3813489A1 EP19205522.6A EP19205522A EP3813489A1 EP 3813489 A1 EP3813489 A1 EP 3813489A1 EP 19205522 A EP19205522 A EP 19205522A EP 3813489 A1 EP3813489 A1 EP 3813489A1
Authority
EP
European Patent Office
Prior art keywords
circuit
voltage
electrode
current
led driver
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.)
Withdrawn
Application number
EP19205522.6A
Other languages
English (en)
French (fr)
Inventor
Wenbo Ma
Yu Li
Qiurong Liao
Chiang Li
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Graphene Lighting Plc
Original Assignee
Graphene Lighting Plc
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Graphene Lighting Plc filed Critical Graphene Lighting Plc
Priority to EP19205522.6A priority Critical patent/EP3813489A1/de
Publication of EP3813489A1 publication Critical patent/EP3813489A1/de
Withdrawn legal-status Critical Current

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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
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/40—Details of LED load circuits
    • H05B45/44—Details of LED load circuits with an active control inside an LED matrix
    • H05B45/46—Details of LED load circuits with an active control inside an LED matrix having LEDs disposed in parallel lines

Definitions

  • the invention relates to LED lamps, particularly to drivers of LED lamps.
  • LEDs Light emitting diodes
  • LEDs have widely replace conventional lighting because of high lighting luminous efficiency.
  • a filament bulb in various kinds of LED lamps.
  • Such a filament bulb possesses both shape characteristics and illuminating characteristics of incandescent bulbs, so it has become a rising product.
  • an LED filament bulb multiple tiny LED chips are connected into a linear or curved shape to imitate a filament of a traditional incandescent bulb and one or more filaments are disposed in a bulb shell.
  • a multi-path output driver as shown in FIG. 1 is available. It integrates two or more independent driver circuits into a single circuit board. In fact, it just combines two or more driver circuits together, but it has drawbacks of high cost and large volume.
  • Such a design can only be used in externally driving lamps (for example, LED fluorescent lamps).
  • LED fluorescent lamps for example, LED fluorescent lamps.
  • an LED filament lamp is very similar to a traditional incandescent bulb in shape, so its driver can only be received in the base (cap). A space in the base is so limited, so a conventional multi-path output driver as shown in FIG. 1 cannot be received in the base.
  • An object of the invention is to provide a multi-path LED driver circuit, whose volume can be effectively shrunk to be received in a base of an LED filament bulb.
  • the invention provides a multi-path LED driver circuit, which includes a rectifier circuit, a filter circuit, a constant voltage circuit, a first constant current circuit and a second constant current circuit.
  • the rectifier circuit connects an AC power source for converting an AC power into a DC power.
  • the filter circuit connects the rectifier circuit for filtering an AC component.
  • the constant voltage circuit connects the filter circuit for generating a fixed voltage and outputting the fixed voltage via a voltage output end. The voltage output end is used for connecting a first electrode of each of two LEDs.
  • the first constant current circuit connects both the constant voltage circuit and a second electrode of one of the two LEDs.
  • the second constant current circuit connects both the constant voltage circuit and a second electrode of another one of the two LEDs.
  • the first and second constant current circuits make currents flowing through the two LEDs independently controllable.
  • the multi-path LED driver circuit of the invention includes an anti-surge circuit 1, a rectifier circuit 2, a filter circuit 3, a constant voltage circuit 4, a first constant current circuit 51 and a second constant current circuit 52.
  • the anti-surge circuit 1 is a protection circuit for additionally resisting lightning strokes or voltage spikes from external alternating current (AC) power source.
  • the anti-surge circuit 1 is not directly relative to the operation of the LED driver circuit of the invention, so it is not a necessary element.
  • the rectifier circuit 2 is either connected to the anti-surge circuit or directly connected to an AC power source for converting AC power from the AC power source into a direct current (DC) power.
  • the filter circuit 3 is connected to the rectifier circuit 2 for filtering an AC component (i.e. ripple) of the AC power output from the rectifier circuit 2.
  • the constant voltage circuit 4 is connected to the filter circuit 3 for generating a fixed voltage output. The fixed voltage is output via a voltage output end 41.
  • the voltage output end 41 is used for connecting a first electrode of each of two LEDs 61, 62 as a load.
  • the first electrode is a positive electrode.
  • the first constant current circuit 51 is connected to both the constant voltage circuit 4 and a second electrode of one of the two LEDs 61, 62.
  • the second constant current circuit 52 is connected to both the constant voltage circuit 4 and a second electrode of the other one of the two LEDs 61, 62.
  • the second electrode is a negative electrode.
  • the first and second constant current circuits 51, 52 make currents flowing through the two LEDs 61, 62 independently controllable.
  • the embodiment shown in the figures is just an example. And a single LED in each load path is also shown as an example. Three or more load paths may be used according to actual demands. There may be multiple LEDs connected in series and/or parallel in each load path.
  • the LED driver circuit of the invention adopts the Boost framework.
  • the constant voltage circuit 4 includes a voltage controller IC3.
  • the voltage controller IC3 adopts the BP2606D made by Bright Power Semiconductor Co., Ltd. in China.
  • the fixed voltage is output to the first (positive) electrodes of the two load LEDs 61, 62 via a voltage output end 41.
  • Each of the first and second constant current circuits 51, 52 forms an individual branch.
  • Each branch includes a current controller IC1, IC2.
  • BP5616C made by Bright Power Semiconductor Co., Ltd. is adopted to serve as each of the current controllers IC1, IC2.
  • the driver circuit of the invention is received in a lamp base 7.
  • a positive electrode of a first set of filaments 61' is electrically connected to the positive terminal LED+ as shown in FIG. 3 , and a negative electrode thereof is electrically connected to the first negative terminal LED1-.
  • a positive electrode of a second set of filaments 62' is electrically connected to the positive terminal LED+, and a negative electrode thereof is electrically connected to the second negative terminal LED2-.
  • Each set of filaments 61', 62' of the embodiment shown in FIG. 4 is composed of two filaments. Of course, one filament is also available.
  • Each of the first set of filaments 61" and the second set of filaments 62" may be individually composed of multiple filaments connected in series and/or parallel, and the number of the filaments connected in series and/or parallel may be identical or different.

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)
EP19205522.6A 2019-10-26 2019-10-26 Mehrwege-led-treiberschaltung Withdrawn EP3813489A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP19205522.6A EP3813489A1 (de) 2019-10-26 2019-10-26 Mehrwege-led-treiberschaltung

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19205522.6A EP3813489A1 (de) 2019-10-26 2019-10-26 Mehrwege-led-treiberschaltung

Publications (1)

Publication Number Publication Date
EP3813489A1 true EP3813489A1 (de) 2021-04-28

Family

ID=68382233

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19205522.6A Withdrawn EP3813489A1 (de) 2019-10-26 2019-10-26 Mehrwege-led-treiberschaltung

Country Status (1)

Country Link
EP (1) EP3813489A1 (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001039553A1 (en) * 1999-11-19 2001-05-31 Gelcore Company Method and device for remote monitoring of led lamps
US20120200229A1 (en) * 2011-02-07 2012-08-09 Cypress Semiconductor Corporation Mutli-string led current control system and method
WO2013180500A1 (ko) * 2012-06-01 2013-12-05 서울반도체 주식회사 Ｌｅｄ 백라이트를 구비하는 디스플레이 장치와 그 전원 공급 장치 및 방법

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001039553A1 (en) * 1999-11-19 2001-05-31 Gelcore Company Method and device for remote monitoring of led lamps
US20120200229A1 (en) * 2011-02-07 2012-08-09 Cypress Semiconductor Corporation Mutli-string led current control system and method
WO2013180500A1 (ko) * 2012-06-01 2013-12-05 서울반도체 주식회사 Ｌｅｄ 백라이트를 구비하는 디스플레이 장치와 그 전원 공급 장치 및 방법

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