GB2617992A - Method and device of detecting open load for dimmable constant voltage driver - Google Patents

Method and device of detecting open load for dimmable constant voltage driver Download PDF

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Publication number
GB2617992A
GB2617992A GB2311409.3A GB202311409A GB2617992A GB 2617992 A GB2617992 A GB 2617992A GB 202311409 A GB202311409 A GB 202311409A GB 2617992 A GB2617992 A GB 2617992A
Authority
GB
United Kingdom
Prior art keywords
detection signal
dimmable
constant voltage
voltage driver
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.)
Pending
Application number
GB2311409.3A
Other versions
GB202311409D0 (en
Inventor
Li Xinhai
Wu Zongjie
Xiong Kun
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.)
Tridonic GmbH and Co KG
Original Assignee
Tridonic GmbH and Co KG
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 Tridonic GmbH and Co KG filed Critical Tridonic GmbH and Co KG
Publication of GB202311409D0 publication Critical patent/GB202311409D0/en
Publication of GB2617992A publication Critical patent/GB2617992A/en
Pending legal-status Critical Current

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]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective 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]
    • H05B45/10—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]
    • H05B45/30—Driver circuits
    • H05B45/32—Pulse-control circuits
    • H05B45/325—Pulse-width modulation [PWM]
    • 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

Abstract

A method and device of detecting open load for a dimmable constant voltage driver, and a dimmable constant voltage driver. A voltage on a switch for dimming at a dimming condition is detected and a detection signal is obtained, the open load condition could be determined according to the detection signal. The reason is that when current flows through a load the load would act as a pull up element at a dimming condition, and a voltage could be detected. Therefore, the shunt resistor or the current sensing transformer is not needed, and a low cost and high efficiency could be achieved for open load detection.

Claims (18)

1. A method of detecting open load for a dimmable constant voltage driver, comprising: detecting a voltage on a switch for dimming at a dimming condition to obta in a detection signal; and determining an open load condition according to the detection signal.
2. The method according to claim 1, wherein, the determining an open load condition according to the detection signal comprises: it is determined that there is a load on the output of the dimmable consta nt voltage driver when the detection signal is a periodic signal; and it is determined that there is no load on the output of the dimmable const ant voltage driver when the detection signal is always low.
3. The method according to claim 2, wherein, the periodic signal is a PWM signal.
4. The method according to claim 1, wherein, the switch is a switching MOSFET.
5. The method according to claim 1, wherein, the method further comprises: transferring the detection signal to a primary side of the dimmable consta nt voltage driver.
6. The method according to claim 5, wherein, the detection signal is transferred to the primary side via an opto-couple r.
7. The method according to claim 1, wherein, the method further comprises: detecting a power or current on a primary side of the dimmable constant vo ltage driver at no dimming condition; and determining an open load condition according to a detected power or curren t.
8. The method according to any one of claims 1-7, wherein, the switch is connected to the output of the dimmable constant voltage dri ver.
9. A device of detecting open load for dimmable constant voltage driver, comprising: a first detection unit configured to detect a voltage on a switch for dimm ing at a dimming condition to obtain a detection signal; and a first determining unit configured to determine an open load condition ac cording to the detection signal.
10. The device according to claim 9, wherein, the first determining unit determines that there is a load on the output o f the dimmable constant voltage driver when the detection signal is a peri odic signal; and determines that there is no load on the output of the dimmable consta nt voltage driver when the detection signal is always low.
11. The device according to claim 10, wherein, the periodic signal is a PWM signal.
12. The device according to claim 9, wherein, the switch is a switching MOSFET.
13. The device according to claim 9, wherein, the device further comprises: a transferring unit configured to transfer the detection signal to a prima ry side of the dimmable constant voltage driver.
14. The device according to claim 13, wherein, the detection signal is transferred to the primary side via an opto-couple r.
15. The device according to claim 9, wherein, the device further comprises: a second detection unit configured to detect a power or current on a prima ry side of the dimmable constant voltage driver at no dimming condition; and a second determining unit configured to detect an open load condition acco rding to a detected power or current.
16. The device according to any one of claims 9-15, wherein, the switch is connected to the output of the dimmable constant voltage dri ver.
17. A dimmable constant voltage driver, comprising: the device according to any one of claims 9-16.
18. The driver according to claim 17, wherein, the dimmable constant voltage driver is a LED driver.
GB2311409.3A 2021-02-10 2021-02-10 Method and device of detecting open load for dimmable constant voltage driver Pending GB2617992A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2021/076569 WO2022170580A1 (en) 2021-02-10 2021-02-10 Method and device of detecting open load for dimmable constant voltage driver

Publications (2)

Publication Number Publication Date
GB202311409D0 GB202311409D0 (en) 2023-09-06
GB2617992A true GB2617992A (en) 2023-10-25

Family

ID=82838122

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2311409.3A Pending GB2617992A (en) 2021-02-10 2021-02-10 Method and device of detecting open load for dimmable constant voltage driver

Country Status (2)

Country Link
GB (1) GB2617992A (en)
WO (1) WO2022170580A1 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101247695A (en) * 2008-03-03 2008-08-20 大连交通大学 Filament open-circuit protector for constant-current light modulation system of air station navigation light
US8310171B2 (en) * 2009-03-13 2012-11-13 Led Specialists Inc. Line voltage dimmable constant current LED driver
CN104507243A (en) * 2014-12-04 2015-04-08 中国船舶重工集团公司第七一七研究所 Light-emitting diode and laser diode open circuit fault detection circuit
US20190098711A1 (en) * 2017-09-28 2019-03-28 Ledvance Gmbh Eliminating Flicker and Open Load Protection for Driver Compatible with NAFTA Dim ECG

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101247695A (en) * 2008-03-03 2008-08-20 大连交通大学 Filament open-circuit protector for constant-current light modulation system of air station navigation light
US8310171B2 (en) * 2009-03-13 2012-11-13 Led Specialists Inc. Line voltage dimmable constant current LED driver
CN104507243A (en) * 2014-12-04 2015-04-08 中国船舶重工集团公司第七一七研究所 Light-emitting diode and laser diode open circuit fault detection circuit
US20190098711A1 (en) * 2017-09-28 2019-03-28 Ledvance Gmbh Eliminating Flicker and Open Load Protection for Driver Compatible with NAFTA Dim ECG

Also Published As

Publication number Publication date
GB202311409D0 (en) 2023-09-06
WO2022170580A1 (en) 2022-08-18

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