TWI425869B - Illumination device - Google Patents

Description

Lighting device

The present invention relates to a lighting device, and more particularly to a lighting device having a light emitting diode.

With the evolution of the times, various lighting devices have become one of the indispensable electrical appliances in daily life. Most of the current lighting devices still use a hot cathode fluorescent lamp as their light-emitting unit.

Please refer to FIG. 1 , which is an equivalent circuit diagram of a lighting device 1 using a hot cathode fluorescent lamp. The lighting device 1 is connected to an AC power source AC and has a ballast 11, a starter 12 and a hot cathode fluorescent lamp 13. Therefore, the operating voltage of the hot cathode fluorescent lamp 13 can be stabilized by the ballast 11 as a current limiting element, and the starter 12 is preheated to the both ends of the hot cathode fluorescent lamp 13.

However, with the advantages of high brightness, power saving, and environmental protection of LEDs, LEDs are gradually being applied to various types of lighting devices.

Please refer to Taiwan New Patent Bulletin No. M345182, which directly sets the LED and its driving circuit in a lamp tube, and directly connects the LED tube to the current hot cathode fluorescent lamp holder. However, in the new patent, the LED drive circuit is driven by one side. In other words, although the LED tube has electrode pins at both ends, only one end of the electrode pins is a passage.

However, in the current drive circuit of the hot cathode fluorescent lamp holder (as shown in FIG. 1), the electrode pins at both ends of the lamp tube must be a passage to be a complete circuit. Therefore, the LED lamp of the new patent is not directly compatible with the current hot cathode fluorescent lamp holder. In other words, the user must modify the drive circuit of the hot cathode fluorescent lamp holder to use it. In this way, not only the user's troubles, but also the cost of use.

Therefore, how to design a lighting device with a light-emitting diode that is compatible with the current hot cathode fluorescent lamp holder has gradually become one of the important topics.

In view of the above problems, it is an object of the present invention to provide an illumination device having a light-emitting diode that is compatible with current hot cathode fluorescent lamp holders.

To achieve the above object, an illumination device according to the present invention comprises a light transmissive tube body, a circuit substrate and a plurality of light emitting diodes. The light-transmitting tube body has a receiving portion and two first electrode portions, and the first electrode portions are respectively located at two ends of the receiving portion. The circuit board is disposed in the receiving portion and has a rectifying circuit, and the rectifying circuit is electrically connected to the first electrode portions. The light emitting diodes are disposed on the circuit substrate and are directly electrically connected to the rectifying circuit.

To achieve the above objective, an illumination device according to the present invention comprises a light transmissive tube body, a circuit substrate, a plurality of light emitting diodes and a lamp holder. The light-transmitting tube body has a receiving portion and two first electrode portions, and the first electrode portions are respectively located at two ends of the receiving portion. The circuit board is disposed on the accommodating portion, and the illuminating diodes are disposed on the circuit board and electrically connected to the first electrode portions. The lamp holder has two second electrode portions, and the first electrode portions of the light-transmitting tube body are respectively connected to the second electrode portions.

As described above, the light-emitting diode system of the illumination device according to the present invention can be electrically connected to the two first electrode portions at both ends of the light-transmitting tube body. Therefore, when the first electrode portions of the light-transmitting tube body of the illumination device are respectively connected to the second electrode portions of the lamp holder (for example, the current hot cathode fluorescent lamp holder), the light-emitting diodes, The first electrode portion and the second electrode portions form a complete loop. Thereby, the illumination device of the present invention can be directly compatible with the current hot cathode fluorescent lamp holder without modifying the drive circuit in the lamp holder.

Hereinafter, a lighting device according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings, in which the same elements will be described with the same reference numerals.

First embodiment

Please refer to FIG. 2, which is a block diagram of a lighting device 2 according to a first embodiment of the present invention. The illuminating device 2 includes a light transmitting tube body 21, a circuit board 22, and a plurality of light emitting diodes 23.

The material of the light-transmitting tube body 21 is, for example, at least one of a polymer material, a glass or a quartz, and has a receiving portion 211 and two first electrode portions 212, and the first electrode portions 212 are respectively located Both ends of the portion 211. In addition, in the present embodiment, each of the first electrode portions 212 has two electrode pins T and a sealing member S, and the electrode pins T of the first electrode portions 212 are short-circuited to each other and fixed to the sealing member S, and The material of the sealing member S can be metal or plastic.

The circuit board 22 is disposed in the accommodating portion 211 and has a rectifying circuit 221, and the rectifying circuit 221 can be, for example, a half bridge rectifying circuit or a full bridge rectifying circuit, and the first electrodes at opposite ends of the accommodating portion 211, respectively. The portion 212 is electrically connected.

The light-emitting diodes 23 are disposed on the circuit board 22 and are directly electrically connected to the rectifier circuit 221 . The light-emitting diodes 23 can be connected in series, in parallel, or in series and in parallel. In the present embodiment, the series-parallel connection in which the partial light-emitting diodes 23 are connected in series and then connected in parallel in the same direction is taken as an example, but it is not limited.

Therefore, the first electrode portion 212 is electrically connected to the first electrode portion 212 via the rectifying circuit 221 , and the light emitting diodes 23 are directly electrically connected to the rectifying circuit 221 . When the first electrode portions 212 of the illuminating device 2 are respectively connected to the electrode portions of the socket (not shown, for example, the current hot cathode fluorescent lamp holder), the LEDs 23 are placed. The first electrode portion 212 at the opposite ends of the portion 211 and the drive circuit in the socket can form a complete loop. Thereby, the illuminating device 2 of the embodiment can be directly compatible with the current lamp holder without modifying the driving circuit in the lamp socket, and can be low-powered, low-heating, and quick-starting by the illuminating diode 23 And the advantages of long life, so that the lighting device 2 replaces the current hot cathode fluorescent lamp.

Please refer to FIG. 3 , which is another schematic diagram of the illumination device of the embodiment. The circuit substrate 22a of the illumination device 2a may further have a protection circuit 222. The rectifier circuit 221 is described by taking a full bridge rectifier circuit as an example, but it is not limited.

The protection circuit 222 is connected in parallel with the light-emitting diodes 23, and may have a capacitive element C or a diode element D, or have a capacitor element at the same time. C and a diode element D. The diode element D can be, for example, a Zener diode. In the present embodiment, the protection circuit 222 has both the capacitive element C and the diode element D.

Therefore, the LEDs 23 can be electrostatically discharged (ESD) protected by the protection circuit 222 to further increase the service life of the illumination device 2a. For example, the capacitive element C is adapted to protect against higher frequency electrostatic noise, while the diode element D is adapted to protect lower frequency electrostatic noise, which is not limiting.

Second embodiment

Please refer to FIG. 4, which is a block diagram of a lighting device 3 according to a second embodiment of the present invention. The illuminating device 3 includes a light-transmissive tube body 31, a circuit board 32, a plurality of light-emitting diodes 33, and a lamp holder 34.

The material of the light-transmissive tube body 31 is, for example, at least one of a polymer material, a glass or a quartz, and has a receiving portion 311 and two first electrode portions 312. The first electrode portions 312 are respectively located. Both ends of the portion 311. In addition, in the present embodiment, each of the first electrode portions 312 has two electrode pins T, and the electrode pins T of the first electrode portions 312 are short-circuited to each other.

The circuit board 32 is disposed on the accommodating portion 311. The illuminating diodes 33 are disposed on the circuit board 32 and electrically connected to the first electrode portions 312. The light-emitting diodes 33 can be connected in series, in parallel, or in series and in parallel. In the present embodiment, the series-parallel connection in which the partial light-emitting diodes 33 are connected in series and then reverse-parallel to each other is taken as an example, but it is not limited.

The socket 34 has two second electrode portions 341, and the first electrode portions 312 of the light-transmitting tube body 31 are respectively connected to the second electrode portions 341. In addition, in the present embodiment, the socket 34 is electrically connected to an AC power source AC, and the first electrode portions 312 are electrically connected to the AC power source AC via the second electrode portions 341, respectively.

Moreover, the lamp holder 34 further has a ballast 342 and an actuator 343, which are electrically connected to the second electrode portions 341, but are not intended to limit the present invention.

Therefore, the first electrode portions 312 of the illumination device 3 are electrically connected to the first electrode portions 312 at opposite ends of the accommodating portion 311 by the light-emitting diodes 33, respectively. When the second electrode portions 341 are connected to each other, the light-emitting diodes 33, the first electrode portions 312 located at opposite ends of the accommodating portion 311, and the driving circuit in the socket 34 can form a complete loop. In other words, the lamp holder 34 of the illumination device 3 can be a current hot cathode fluorescent lamp holder without modifying the drive circuit in the lamp holder 34, and can be low-power, low-heat, and fast by the light-emitting diode 33. The advantages of starting and long life make the lighting device 3 replace the current hot cathode fluorescent lamp. Moreover, the series-parallel connection manner in which the light-emitting diodes 33 on the circuit substrate 32 are connected in series and then reverse-parallel to each other is suitable for direct driving by AC driving, and the circuit complexity on the circuit substrate 32 can be further reduced. Degree to further reduce costs.

In addition, in order to stabilize the illumination of the LEDs 33, the actuator 343 can also be removed, thereby reducing the cost of the actuator 343 and avoiding the disadvantage of power loss caused by the high voltage generated by the actuator 343. Moreover, if the lamp holder 34 is in the form of an electronic ballast (not shown) and the electronic ballast is electrically connected to the second electrode portions 341, the conventional ballast 342 is intended The starter 343 is replaced with an electronic ballast. The light-emitting diodes 33, the first electrode portions 312 located at opposite ends of the accommodating portion 311, and the driving circuit in the socket 34 can also form a complete loop. The lighting device 3 can still operate effectively.

Please refer to FIG. 5, which is another schematic diagram of the illumination device 3a of the present embodiment. The circuit board 32a of the illuminating device 3a may have a rectifying circuit 321 and a protection circuit 322, and the illuminating diodes 33 are connected in series and in parallel in parallel with the partial illuminating diodes 33. The rectifier circuit 321 can be, for example, a half bridge rectifier circuit or a full bridge rectifier circuit. The full bridge rectifier circuit is taken as an example for illustration, but it is not limited.

Similarly, the actuator 343 can also be removed for more power saving and more stable illumination. In the present embodiment, the lamp holder 34 of the illumination device 3a can still be applied with the current hot cathode fluorescent lamp holder without modifying the drive circuit in the lamp holder 34.

In summary, the illuminating two-pole system of the illuminating device according to the present invention can be electrically connected to the two first electrode portions at both ends of the light-transmitting tube. Therefore, when the first electrode portions of the light-transmitting tube body of the illumination device are respectively connected to the second electrode portions of the lamp holder (for example, the current hot cathode fluorescent lamp holder), the light-emitting diodes, The first electrode portion and the drive circuit in the socket form a complete loop. Thereby, the illumination device of the invention can be directly compatible with the current hot cathode fluorescent lamp holder without modifying the drive circuit in the lamp holder, and can be low-power, low-heat and fast by the light-emitting diode. The advantages of start-up and long life make the lighting device replace the current hot cathode fluorescent lamp.

In addition, in order to stabilize the illumination of the light-emitting diodes, the starter required for the conventional hot cathode fluorescent lamp holder can also be removed, thereby reducing the cost and avoiding the power loss caused by the high voltage generated by the starter. Disadvantages.

The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.

1, 2, 2a, 3, 3a. . . Lighting device

11. . . Ballast

12. . . Launcher

13. . . Hot cathode fluorescent tube

21, 31. . . Light-transmissive tube

211, 311. . . Housing

212, 312. . . First electrode portion

22, 22a, 32, 32a. . . Circuit substrate

221, 321. . . Rectifier circuit

222, 322. . . Protection circuit

23, 33. . . Light-emitting diode

34. . . Lamp holder

341. . . Second electrode portion

342. . . Ballast

343. . . Launcher

AC. . . AC power

C. . . Capacitive component

D. . . Diode component

S. . . Seals

T. . . Electrode pin

1 is an equivalent circuit diagram of a conventional illumination device using a hot cathode fluorescent lamp;

Figure 2 is a block diagram of a lighting device in accordance with a first embodiment of the present invention;

3 is a schematic diagram showing another equivalent embodiment of a lighting device according to a first embodiment of the present invention;

Figure 4 is a block diagram of a lighting device in accordance with a second embodiment of the present invention;

FIG. 5 is a schematic diagram showing another equivalent embodiment of a lighting device according to a second embodiment of the present invention.

2. . . Lighting device

twenty one. . . Light-transmissive tube

211. . . Housing

212. . . First electrode portion

twenty two. . . Circuit substrate

221. . . Rectifier circuit

twenty three. . . Light-emitting diode

AC. . . AC power

T. . . Electrode pin

S. . . Seals

Claims (10)

An illuminating device comprising: a light-transmissive tube body having a receiving portion and two first electrode portions, wherein the first electrode portions are respectively located at two ends of the accommodating portion; and a circuit substrate is disposed at the accommodating portion a plurality of light-emitting diodes disposed on the circuit substrate and electrically connected to the first electrode portions, wherein the light-emitting diode systems are connected in series and then connected in reverse parallel with each other; and a lamp holder having The two second electrode portions are respectively connected to the first electrode portions of the light-transmitting tube body. The illuminating device of claim 1, wherein the socket is electrically connected to an AC power source, and the first electrode portions are electrically connected to the AC power source via the second electrode portions. The illuminating device of claim 1, wherein the lamp holder further has a ballast electrically connected to the second electrode portions. The illuminating device of claim 3, wherein the lamp holder further has an actuator electrically connected to the second electrode portions. The illuminating device of claim 1, wherein the lamp holder has an electronic ballast electrically connected to the second electrode portions. The illuminating device of claim 1, wherein each of the first electrode portions has two electrode pins, and the electrode pins of each of the first electrode portions are short-circuited to each other. The lighting device of claim 1, wherein the circuit substrate has a rectifying circuit, and the rectifying circuit is respectively connected to the first electric The poles are electrically connected, and the light emitting diodes are directly electrically connected to the rectifier circuit. The lighting device of claim 7, wherein the rectifying circuit is a half bridge rectifying circuit or a full bridge rectifying circuit. The lighting device of claim 1, wherein the circuit substrate has a protection circuit connected in parallel with the light emitting diodes. The lighting device of claim 9, wherein the protection circuit has a capacitive element or a diode element, or the protection circuit has a capacitive element and a diode element.