CN101986009A - Adaptive alternating current light-emitting diode filament and illuminating lamp - Google Patents

Abstract

The invention provides a spare AC LED filament and an illuminating lamp. The spare AC LED filament includes two parallel columns of light-emitting diode modules with opposite conduction directions. Each light-emitting diode module is first connected in series with a Zener diode and a spare light-emitting diode, and then the series branch and the main light-emitting diode are connected in parallel in the same direction. made. The invention also provides an LED lighting lamp using the filament. In the present invention, Zener diodes and spare LEDs are first connected in series, and then connected in parallel on the main LEDs: once a certain main LED in one group is disconnected, the series branch connected in parallel to it provides a path for it, although the The failed main LED will no longer emit light, the zener diode on the series branch will be turned on, the spare LED will replace the main LED and continue to work normally, and other main LEDs connected in series with the main LED can still continue to work without affecting the overall circuit.

Description

A spare AC LED filament and lighting lamp

technical field

The invention relates to an LED lighting appliance, in particular to a spare AC LED filament and a lighting lamp.

Background technique

For traditional AC LED lights, as shown in Figure 1, after connecting two columns of light-emitting diodes with the same number in series in anti-parallel, they are directly powered by power frequency AC, which can save the DC power drive and reduce costs. In addition, the two columns emit light due to the AC. The diodes are alternately turned on, so that it has a certain time to reduce the junction temperature of the light-emitting diodes, improve the life of the light-emitting diodes, and thus increase the life of the lamp. But there is such a problem in this circuit, once a light-emitting diode in any column in the anti-parallel connection fails in an open circuit, the entire circuit will fail, and the failure rate is several times that of a single LED, and the multiple is the number of series series. Figure 2 is an improved AC LED structure. When the LED lamp in one current direction is open-circuited and damaged, other LEDs in series in this direction will conduct through the reverse leakage current of the LED in the other current direction. Obviously, the reverse leakage current of the LED is very small. , LED luminous brightness is limited. Therefore, a better solution is needed to improve the reliability of the overall circuit.

In order to solve the above problems, the present invention can provide a spare AC LED filament, as shown in Figure 3, by designing a circuit that changes the connection of the LED to directly realize the grid power frequency AC drive.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages caused by the above problems, and provide a spare AC LED filament and lighting lamp. The present invention is realized through the following technical solutions.

A spare AC LED filament, comprising two rows of light-emitting diode modules with opposite conduction directions connected in parallel, each of which is composed of several light-emitting diode modules in the same number in series; each light-emitting diode module consists of A zener diode is connected in parallel with the main light emitting diode in the same direction as a spare light emitting diode in series. the

In addition, in the above-mentioned spare AC LED filament, in the light-emitting diode module, the anode of the zener diode is connected to the anode of the spare light-emitting diode; the cathode of the zener diode is connected to the anode of the main light-emitting diode, and the terminal is the light-emitting diode module The positive terminal of the standby LED; the cathode of the standby LED is connected to the cathode of the main LED, and this terminal is the negative terminal of the LED module.

The standby light emitting diode may include more than one light emitting diode; the main light emitting diode may include more than one light emitting diode.

The present invention also provides an AC LED lighting lamp, comprising an AC input terminal and an AC LED filament connected between the AC input terminals, and the AC LED filament is a spare AC LED filament.

Compared with prior art, advantage and beneficial effect of the present invention are:

Zener diodes and spare light-emitting diodes are used in series first, and then connected in parallel on the main light-emitting diodes: once one of the main LEDs in one group is disconnected, the series branch connected in parallel to it provides a path for it, although the failed main LED The LED no longer emits light, the zener diode on the series branch will be turned on, the spare LED will replace the main LED and continue to work normally, and other main LEDs connected in series with the main LED can still continue to work without affecting the overall circuit.

Description of drawings

Figure 1 is a traditional AC LED filament connection circuit diagram.

Fig. 2 is the connection circuit diagram of the AC LED filament after the improvement of Fig. 1 .

Fig. 3 is a spare AC LED filament according to an embodiment of the present invention. the

FIG. 4 is an AC LED lighting lamp composed of a spare AC LED filament shown in FIG. 3 .

Detailed ways

The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings, but the implementation and protection scope of the present invention are not limited thereto.

Figure 1 is a traditional AC LED filament connection circuit diagram. This circuit has such a problem that once a light-emitting diode in any column in the anti-parallel connection fails in an open circuit, the entire circuit will fail, and the failure rate is several times that of a single LED, and the multiple is the number of series series.

Figure 2 is a diagram of the AC LED filament connection circuit diagram after the improvement of Figure 1, using a grid-like array structure in the LED lamps in the same current direction to deal with the open-circuit damage of individual LEDs.

Figure 3 is a schematic circuit diagram of a spare AC LED filament, including two rows of light-emitting diode modules (1 and 2) connected in parallel with opposite conduction directions. Different from ordinary light-emitting diodes, each light-emitting diode The nano-diode 5 is connected in series with a spare light-emitting diode 4, and then the series branch and the main light-emitting diode 3 are connected in parallel in the same direction.

Figure 4 shows an AC LED lighting lamp according to an embodiment of the present invention, which includes an AC input terminal AC, a capacitor C, and an AC LED filament connected between the AC input terminals. structure. The capacitor C has the function of voltage division, and in addition, when the parameters are selected properly, it can play the role of current limitation.

Working principle: Zener diodes and spare light-emitting diodes are used in series first, and then connected in parallel on the main light-emitting diode: once a certain main LED in one group is disconnected, the series branch connected in parallel to it provides a path for it, although The failed main LED will no longer emit light, the zener diode on the series branch will be turned on, the backup LED will replace the main LED and continue to work normally, and other main LEDs connected in series with the main LED can still continue to work without affecting the overall circuit .

Claims (5)

1. A spare AC LED filament, comprising two rows of light-emitting diode modules (1, 2) connected in parallel with opposite conduction directions, characterized in that each row of light-emitting diode modules consists of several light-emitting diodes of the same number Modules are connected in series; each light emitting diode module is formed by connecting a zener diode (5) in series with a spare light emitting diode (4) and then paralleling the main light emitting diode (3) in the same direction. 2. A spare AC LED filament according to claim 1, characterized in that: in the light-emitting diode module, the anode of the Zener diode (5) is connected to the anode of the spare light-emitting diode (4); the Zener diode (5) ) is connected to the anode of the main light-emitting diode (3), and this terminal is the positive terminal of the light-emitting diode module; the cathode of the spare light-emitting diode (4) is connected to the cathode of the main light-emitting diode (3), and this terminal is the light-emitting diode negative terminal of the module. 3. A spare AC LED filament according to claim 1, characterized in that the spare light emitting diode (4) includes more than one light emitting diode. 4. A spare AC LED filament according to any one of claims 1-3, characterized in that the main light-emitting diode includes more than one light-emitting diode. 5. An AC LED lighting lamp, comprising an AC input terminal and an AC LED filament connected between the AC input terminals, characterized in that: the AC LED filament is the spare AC LED filament described in claim 1.

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