CN108811230B - Lamp driver for an LED lamp and LED lamp for arrangement in a fluorescent lamp fixture - Google Patents
Lamp driver for an LED lamp and LED lamp for arrangement in a fluorescent lamp fixture Download PDFInfo
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- CN108811230B CN108811230B CN201710311536.9A CN201710311536A CN108811230B CN 108811230 B CN108811230 B CN 108811230B CN 201710311536 A CN201710311536 A CN 201710311536A CN 108811230 B CN108811230 B CN 108811230B
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- led
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- 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
- H05B45/357—Driver circuits specially adapted for retrofit LED light sources
- H05B45/3578—Emulating the electrical or functional characteristics of discharge lamps
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- 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
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention provides a lamp driver (10) for an LED lamp (1), comprising: an LED driver (11) for driving the LEDs (21); a voltage input (15) adapted to connect the LED driver (11) to an electronic ballast of a fluorescent lamp fixture as a power supply; a voltage output (16) adapted to connect the LED (21) to the LED driver (11); and a ripple current suppression circuit (12) connected in series between the LED driver (11) and the voltage output terminal (16) and configured to suppress a ripple current.
Description
Technical Field
The invention relates to a lamp driver for an LED lamp and to an LED lamp for arrangement in a fluorescent lamp fixture.
Background
As an effective alternative to incandescent light bulbs, fluorescent lamps have become a well-known and widely used lighting device. However, with the advent of LED lamps (LEDs are an abbreviation for light emitting diodes), more efficient and long-lived lighting devices are available. Furthermore, the material of LED lamps is safer compared to fluorescent lamps, since for example mercury is not needed. There is therefore a need to replace existing fluorescent lamps with LED lamps, preferably without the need to change the entire luminaire or luminaire.
Currently available fluorescent lamp fixtures typically comprise a so-called electronic ballast (also called electronic control means, ECG) for regulating and limiting the current supplied to the fluorescent lamp. Electronic ballasts typically operate lamps at high frequencies up to 50 kHz. The frequency of the electronic ballast is selected such that the resonant frequency of the fluorescent gas is met, thereby enabling active control of the current through the fluorescent lamp and thereby increasing the efficiency of the fluorescent lamp.
However, some electronic ballasts have unstable outputs, and therefore, unstable ripples may occur in the ballast output, particularly if a general fluorescent lamp has been replaced with a replacement LED. Ripple is typically caused by the unstable performance of the PFC circuit (power factor correction circuit) of the ECG, and in some embodiments, the ripple may be in, but is not limited to, the 350Hz frequency region. This ripple will then be transmitted directly to the LED, especially if a passive linear LED driver is used.
In case a normal fluorescent lamp is connected to the electronic ballast, these ripples will not flicker the fluorescent lamp, since the fluorescent lamp is not particularly sensitive to ripples. However, in case the LED lamp (in particular the passive LED tube) is connected to an electronic ballast, these ripples may cause undesired flickering and/or flashing of the LED lamp.
To connect a replacement LED lamp to a conventional fluorescent lamp fixture, including an electronic ballast, the LED lamp typically includes an LED lamp driver that regulates the voltage and/or current provided by the electronic ballast to the voltage and/or current required by the LED. Virtual loads and LC passive loads are used to meet these needs. The LC passive load is intended to change the resonance characteristics of the ECG to increase the constant output current of the ECG and to increase the loading of the ECG in order to avoid light loaded modes of the ECG. However, LC passive loads can cause undesirable losses in high efficiency LED lamps.
Thus, currently available lamp drivers do not address the problem of flickering and/or flashing of LED lamps due to ripple.
Disclosure of Invention
In view of the above-mentioned drawbacks of the presently known lamp drivers, it is an object of the present invention to provide a lamp driver which reduces, preferably eliminates, flickering of LED lamps. It is another object of the present invention to provide an LED lamp with these characteristics to be arranged into a fluorescent lamp fixture.
This object is achieved by a lamp driver and an LED lamp according to the independent claims. Preferred embodiments are given by the dependent claims, the description and the figures.
Thus, the present invention provides a lamp driver for an LED lamp. The lamp driver includes: an LED driver for driving an LED; a voltage input adapted to connect the LED driver to an electronic ballast of a fluorescent lamp fixture as a power supply; a voltage output for connecting the LED to the LED driver; and a ripple current suppression circuit. A ripple current suppression circuit, in particular an electronic circuit for suppressing ripple current, is connected in series between the LED driver and the voltage output.
In particular, this arrangement enables decoupling of the LEDs from the unstable output of the electronic ballast or electronic control device residing in a common fluorescent lamp fixture.
In particular, the ripple current is absorbed using an active circuit, so that effective suppression of the ripple current can be efficiently achieved.
Preferably, the LED driver is an ECG.
The LED driver may comprise passive components, in particular diodes. Further, the LED driver may be an electronic circuit. Preferably, the diodes of the electronic control device or the LED driver are interconnected as a bridge circuit. The bridge circuit may comprise four diodes on two branches, each branch comprising two diodes connected in series.
The ripple current suppression circuit may include active components such as transistors. Preferably, the transistor is adapted to absorb an unstable part of the output of the electronic ballast or the electronic control device, in particular a low frequency ripple current.
For example, in the case where the rated frequency of the power supply is 50Hz, the low-frequency ripple current may exhibit a frequency less than 50Hz, and the high-frequency ripple current may exhibit a frequency at least above 50Hz (preferably, above 100 Hz).
In a particular embodiment of an ECG, the frequency of the ripple current may be 350Hz, but depending on the ECG (in particular the PFC circuitry used by the ECG) and on the performance of other components, the frequency of the ripple may also occur at other frequencies. A ripple current suppression circuit of a lamp driver of the form as proposed herein is adapted to suppress ripple current at frequencies of various situations.
Furthermore, the ripple current suppression circuit may further include passive components for absorbing high frequency current (e.g., ripple current having a frequency in excess of 50 Hz). Preferably, the passive components are resistors and capacitors interconnected as an RC circuit.
Preferably, the lamp driver is adapted to an LED group comprising a plurality of LEDs. Multiple LEDs may be connected in series. In a further preferred embodiment, the lamp driver is adapted for LEDs emitting visible light, in particular LEDs emitting white light.
In a preferred embodiment of the lamp driver, the lamp driver further comprises an electrolytic capacitor connected in parallel to the LED driver and adapted to absorb the high frequency ripple current.
Preferably, the electrolytic capacitor may be an aluminum electrolytic capacitor, a tantalum electrolytic capacitor, or a niobium electrolytic capacitor. Further, the electrolytic capacitor may be connected in parallel to the ripple current suppression circuit and/or the LED. Alternatively, the electrolytic capacitor is an RC circuit with the performance of a high pass filter.
Additionally or alternatively, the electrolytic capacitor may be connected to the LED driver via one or more diodes (e.g., a bridge circuit). Preferably, the electrolytic capacitor is part of the ripple current suppression circuit or may be implemented in the ripple current suppression circuit, for example, as an RC circuit.
According to at least one embodiment of the lamp driver, the ripple current suppression circuit comprises at least one transistor.
Transistors are active components, in particular semiconductors. The transistor is adapted to filter current. The transistor may be a bipolar junction transistor or a darlington transistor. Preferably, the transistor is a field effect transistor such as a MOSFET. Advantageously, the transistor may operate in the variable resistance region, so the transistor may control the ripple voltage output of the electronic control device or the LED driver.
According to at least one embodiment of the lamp driver, the at least one transistor is adapted to control any voltage provided by the LED driver.
Additionally or alternatively, the at least one transistor is adapted to control any voltage provided by the electronic ballast or the electronic control device. The reverse voltage of the transistor is therefore greater than the rated output voltage of the electronic ballast or the electronic control unit or the LED driver.
According to at least one embodiment of the lamp driver, the ripple current suppression circuit comprises at least one resistor connected in parallel to the LED driver.
The resistor may be designed as a filter or as part of a filter to avoid resonance in the ripple current suppression circuit. Alternatively or additionally, the at least one resistor is implemented as a damping resistor.
According to at least one embodiment of the lamp driver, the ripple current suppression circuit comprises at least one capacitor connected in parallel to the LED driver.
The at least one capacitor may be integrated as a filter or filter capacitor. The capacitor may also be used to buffer voltages or as a decoupling capacitor. Thus, the capacitor also smoothes the ripple current.
According to at least one embodiment of the lamp driver, the at least one resistor of the ripple current suppression circuit is connected in parallel to the at least one capacitor of the ripple current suppression circuit.
Preferably, the at least one capacitor and the at least one resistor form an RC circuit having the performance of a low pass filter. The RC circuit may be adapted for resonance of the electronic control device.
According to at least one embodiment of the lamp driver, the ripple current suppression circuit is adapted to any voltage provided by the LED driver.
Additionally or alternatively, the ripple current suppression circuit is applicable to any voltage provided by the electronic ballast or the electronic control device. Therefore, the input operating voltage range of the ripple current suppression circuit is at least as wide as the range of the output voltage of the LED driver or the electronic ballast or the electronic control device.
According to at least one embodiment of the lamp driver, the ripple current suppression circuit can be used for power factors larger than 0.9.
Therefore, the ripple current suppression circuit includes at least one transistor, and a first resistor and a first capacitor that constitute the suppression circuit. Preferably, the parameters of the components and/or the design of the suppression circuit are adapted for a power factor of more than 0.9. Therefore, the ripple current suppression circuit can operate in a wide voltage band.
In addition, the invention provides an LED lamp. The LED lamp comprises a lamp driver as described above and at least one LED. That is, all features disclosed for the LED driver are also disclosed for the LED lamp and vice versa.
The LED lamp is for arrangement in a fluorescent lamp fixture and comprises a lamp driver in the form as described above. The at least one LED is connected to a voltage output of the lamp driver, and the voltage input of the lamp driver is adapted to be connected to an electronic ballast of the fluorescent lamp fixture.
The LED lamp includes: the lamp driver described above having an LED driver for driving an LED; a voltage output for connecting the LED to the LED driver; and a ripple current suppression circuit connected in series between the LED driver and the voltage output terminal and configured to suppress a ripple current.
The LEDs may be included in an LED group having a plurality of LEDs. Multiple LEDs may be connected in series.
During normal operation of the LED lamp, the LED may emit visible light, in particular white light.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.
Fig. 1 shows an exemplary embodiment of an LED lamp according to the present description.
Fig. 2 shows an exemplary embodiment of a ripple current suppression circuit according to the present description.
Detailed Description
Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. Here, elements in the drawings that are the same, similar or have the same or similar effect are provided with the same reference numerals. To prevent redundant description, repeated description of these elements may be omitted.
The drawings of the elements and the dimensional relationships between them shown in the drawings should not be considered to be to scale. Rather, various elements may be shown with exaggerated dimensions to enable better illustration and/or better understanding.
An embodiment of the LED lamp 1 according to the invention is explained in detail with reference to the circuit schematic of fig. 1, the LED lamp 1 having a lamp driver 10 and an LED circuit 20, in particular comprising a set of LEDs 21.
The lamp driver 10 includes an LED driver 11, a ripple current suppression circuit 12, an electrolytic capacitor 13, two filament circuits 14 (each filament circuit 14 has two pins constituting a voltage input terminal 15), a voltage input terminal 15, and a voltage output terminal 16. These components are electrically connected to each other, in particular in series, to form a lamp driver circuit.
The voltage input 15 is adapted to be connected to a conventional fluorescent lamp fixture.
The voltage input 15, in particular the legs of the two filament circuits 14, are connected in series with the two filament circuits 14. The two filament circuits 14 are each connected in series with an LED driver 11 for driving the LEDs 21. The LED driver 11 is also connected in parallel with an electrolytic capacitor 13, and the electrolytic capacitor 13 is connected in parallel with a ripple current suppression circuit 12 for suppressing a ripple current.
The filament circuit 14 is intended to simulate the behavior of fluorescent lamps on the ECG so that the preheating function of the ECG and in particular the function of the ECG that senses the filaments do not prevent the ECG from supplying voltage to the voltage input 15. In particular, this may be the case in the absence of the filament circuit 14: the ECG of a conventional fluorescent lamp fixture cannot provide voltage to the voltage input 15. It is well known to provide a filament circuit 14 in order to achieve this property of the ECG of a conventional fluorescent light fixture.
The ripple current suppression circuit 12 is connected in series with the voltage output terminal 16 for connecting the LED 21 to the LED driver 11. The voltage output 16 is also connected to an LED circuit 20.
A pin of the voltage input 15, in particular a power supply connection pin of the lamp driver, can be connected to a power supply to receive a supply voltage uin. When a lamp driver (which in combination with other features forms a replacement lamp for replacing a fluorescent lamp fixture) is connected to a conventional fluorescent lamp fixture, a supply voltage uinProvided by the electronic ballast of the fluorescent lamp fixture.
Then, the power supply voltageu inIs itself converted into the LED driver terminal voltage u via the filament circuit 14idr. Thus, the filament circuit 14 is interconnected between the LED driver 11 and a power supply that supplies voltage to the LEDs 21 of the LED lamp 1.
Then, the driver terminal voltage uidrIs converted into an LED driver output voltage u via an LED driver 11 for driving an LED circuit 20, in particular an LED 21 for driving the LED circuit 20odr。
Then, the output power of the LED driver is converted by the ripple current suppression circuit 12Press uodr. In particular, the high-frequency current ripple of the LED driver 11 is suppressed by the ripple current suppression circuit 12.
Preferably, the low-frequency current ripple is suppressed by the electrolytic capacitor 13 connected between the LED driver 11 and the ripple current suppression circuit 12. Alternatively, the electrolytic capacitor may be a part of the ripple current suppression circuit 12 or may be implemented in the ripple current suppression circuit 12. Ripple current suppression circuit 12 is also applicable to any voltage or any current or any frequency provided by LED driver 11, in particular to any LED driver output voltage uodr。
The ripple current suppression circuit 12 provides an output voltage at a voltage output 16 of the lamp driveru out. Output voltage uoutAre provided via electrical connections to terminals of the LED circuit 20, in particular to the power input 22 of the LED circuit. The current supplied to the LED terminals is smoother than the LED driver current itself, after suppressing high frequency current ripples and low frequency current ripples. Therefore, flickering of the LED 21 is avoided.
Furthermore, the LED circuit 20 comprises a plurality of LEDs 21 connected in parallel with the lamp driver 10 via the voltage output 16 (in particular the voltage output of the lamp driver) and a power input 22 (in particular the power input of the LED circuit). Also, the LED circuit 20 is connected in parallel with the LED driver 11. The LEDs 21 of the LED circuit 20 are connected in series and emit visible light, in particular white light, during normal operation of the LED lamp 1.
Fig. 2 shows an exemplary embodiment of the ripple current suppression circuit described above.
The ripple current suppression circuit 12 comprises at least one transistor 121, in particular a MOSFET, a first resistor 122 and a first capacitor 123 for suppressing the LED driver output voltage uodrAnd provides the output voltage u of the lamp driverout。
Preferably, transistor 121 operates in the variable resistance region and controls the LED driver output voltage uodrThe ripple of (3). Thus, the transistor 121 functions like a filter. The first resistor 122 and the first capacitor 123 constitute a parallel connection to the transistor121 to smooth the current, in particular the current of the LEDs, to avoid flicker. The first RC series circuit (i.e. the first resistor 122 and the first capacitor 123) has decoupling properties and will also improve the ECG compatibility, thereby reducing flicker.
The ripple current suppression circuit 12 further includes a second RC circuit (specifically, a second resistor 124 and a second capacitor 125) connected in parallel in the terminal direction. The second RC circuit may further reduce ripple. Preferably, the transfer functions of the first and second RC series circuits are different, such as a high pass filter performance and a low pass filter performance. In particular, the ripple current suppression circuit 12 is adapted to solve, for example, a flicker problem caused by a high-frequency ripple, and also to smooth an AC main ripple (particularly, a low-frequency ripple).
The ripple current suppression circuit 12 further includes a diode 126, a first zener diode 127, a second zener diode 128, and a third resistor 129. These components are implemented for safety reasons and to adjust the transfer function of the ripple current suppression circuit 12.
In particular, the ripple current suppression circuit 12 is adapted to solve the flicker or w-ripple problem and also to smooth the AC main ripple.
With the lamp driver described herein, a simple control of the ripple current of the power supply or the electronic ballast is provided and has a good performance. Furthermore, the lamp driver can be manufactured in a cost-effective manner.
In particular, the ECG internal circuitry improves the compatibility of ECGs (including high power factor ECG and low power factor ECG). Furthermore, the reduced current ripple may improve the performance and extend the lifetime of the LED. Furthermore, due to the reduced energy losses in the lamp driver, the lamp driver is suitable for low lumens and low power, while having a low cost compared to other solutions, such as LC passive load solutions.
The present invention is not limited to the description based on the embodiment. Rather, the invention encompasses any novel feature and any combination of features, in particular any combination of features in the patent claims, even if this feature or this combination itself is not explicitly specified in the patent claims or in the exemplary embodiments.
List of reference numerals
1 LED lamp
10 lamp driver
11 LED driver
12 ripple current suppression circuit
121 transistor
122 first resistor
123 first capacitor
124 second resistor
125 second capacitor
126 diode
127 first Zener diode
128 second Zener diode
129 third resistor
13 electrolytic capacitor
14 filament circuit
15 voltage input terminal
16 voltage output terminal
20 LED circuit
21 LED
22 power input
uinSupply voltage
uidrLED driver terminal voltage
uLEDLED terminal voltage
uodrLED driver output voltage
uoutOutput voltage of a lamp driver
Claims (6)
1. A lamp driver (10) for an LED lamp (1), comprising:
an LED driver (11) for driving the LEDs (21),
a voltage input (15) adapted to connect the LED driver (11) to an electronic ballast of a fluorescent lamp fixture as a power supply,
a voltage output (16) adapted to connect the LED (21) to the LED driver (11), an
A ripple current suppression circuit (12) connected in series between the LED driver (11) and the voltage output terminal (16) and configured to suppress a ripple current,
wherein the ripple current suppression circuit (12) comprises:
a series RC circuit of a first resistor (122) and a first capacitor (123), wherein the series RC circuit is connected in parallel to at least one transistor (121), an
A parallel RC circuit provided between the terminals of the series RC circuit and the ripple current suppression circuit (12),
and wherein the transfer functions of the first and second RC series circuits are different.
2. The lamp driver (10) according to claim 1, further comprising an electrolytic capacitor (13) connected in parallel to the LED driver (11), wherein the electrolytic capacitor (13) is adapted to absorb a high frequency ripple current.
3. The lamp driver (10) according to claim 1, wherein the at least one transistor (121) is adapted for controlling any voltage provided by the LED driver (11)
4. The lamp driver (10) according to claim 1 or 2, wherein the ripple current suppression circuit (12) is adapted to any voltage provided by the LED driver (11)
5. The lamp driver (10) according to claim 1 or 2, wherein the ripple current suppression circuit (12) is operable for a power factor larger than 0.9.
6. LED lamp (1) for arrangement in a fluorescent lamp fixture, comprising a lamp driver (10) according to claim 1 or 2, wherein at least one LED (21) is connected to the voltage output (16) of the lamp driver (10), and wherein the voltage input (15) of the lamp driver (10) is adapted to be connected to the electronic ballast of the fluorescent lamp fixture.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710311536.9A CN108811230B (en) | 2017-05-05 | 2017-05-05 | Lamp driver for an LED lamp and LED lamp for arrangement in a fluorescent lamp fixture |
| DE102018110635.1A DE102018110635B4 (en) | 2017-05-05 | 2018-05-03 | Lamp driver for a LED lamp and LED lamp for placement in a fluorescent lamp holder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710311536.9A CN108811230B (en) | 2017-05-05 | 2017-05-05 | Lamp driver for an LED lamp and LED lamp for arrangement in a fluorescent lamp fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108811230A CN108811230A (en) | 2018-11-13 |
| CN108811230B true CN108811230B (en) | 2021-11-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710311536.9A Active CN108811230B (en) | 2017-05-05 | 2017-05-05 | Lamp driver for an LED lamp and LED lamp for arrangement in a fluorescent lamp fixture |
Country Status (2)
| Country | Link |
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| CN (1) | CN108811230B (en) |
| DE (1) | DE102018110635B4 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103442481A (en) * | 2013-08-01 | 2013-12-11 | 梁贵斌 | Full-compatible low-ripper LED fluorescent lamp |
| CN105050262A (en) * | 2015-07-13 | 2015-11-11 | 南宁常萌电子科技有限公司 | All-solid-state low-ripple LED lamp intelligent numerical control power supply |
| CN106304478A (en) * | 2014-10-17 | 2017-01-04 | 东莞泛美光电有限公司 | Illumination driver that ballast is compatible and include its LED light lamp |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282606B (en) * | 2008-05-05 | 2012-10-03 | 深圳唐微科技发展有限公司 | Control method for power adapter of LED lamp without electrolysis capacitor |
| US8310172B2 (en) * | 2008-12-10 | 2012-11-13 | Linear Technology Corporation | Current ripple reduction circuit for LEDs |
| EP2477456B1 (en) * | 2011-01-14 | 2016-04-06 | Ontopx LED GmbH | Drive circuit for light-emitting diode array |
| CN103390993B (en) * | 2012-05-11 | 2017-04-19 | 欧司朗股份有限公司 | Load driving circuit and method and lamp |
| CN104242620B (en) * | 2014-09-01 | 2017-07-28 | 成都芯源系统有限公司 | system with ripple suppression circuit and ripple suppression method thereof |
| CN105138064A (en) * | 2015-08-04 | 2015-12-09 | 广东顺德中山大学卡内基梅隆大学国际联合研究院 | Low differential pressure linear voltage regulator circuit with high bandwidth high power supply ripple inhibition ratio |
| CN106211423A (en) * | 2016-07-05 | 2016-12-07 | 成都中冶节能环保工程有限公司 | A kind of ripple suppressive LED energy-saving driving system based on power amplification circuit |
-
2017
- 2017-05-05 CN CN201710311536.9A patent/CN108811230B/en active Active
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- 2018-05-03 DE DE102018110635.1A patent/DE102018110635B4/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103442481A (en) * | 2013-08-01 | 2013-12-11 | 梁贵斌 | Full-compatible low-ripper LED fluorescent lamp |
| CN106304478A (en) * | 2014-10-17 | 2017-01-04 | 东莞泛美光电有限公司 | Illumination driver that ballast is compatible and include its LED light lamp |
| CN105050262A (en) * | 2015-07-13 | 2015-11-11 | 南宁常萌电子科技有限公司 | All-solid-state low-ripple LED lamp intelligent numerical control power supply |
Also Published As
| Publication number | Publication date |
|---|---|
| DE102018110635A1 (en) | 2018-11-08 |
| DE102018110635B4 (en) | 2019-08-29 |
| CN108811230A (en) | 2018-11-13 |
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