JP2007207445A - Power supply device for external electrode fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To materialize a compact power supply device by integrating a converter with an inverter, forming a slender substrate corresponding to the slender tube of an EEFL lamp, and optimizing heat dissipation balance. <P>SOLUTION: A substrate 40 is slenderly formed, and the width dimension of the substrate 40 is almost matched to the width dimensions of smoothing capacitors C4, C8, C9, a high voltage transformer 4, and choke coils L2, L3. In addition, a rectifying part 32 where a large amount of heat is generated, a switching power supply part 34, switching transistors Q1, Q2, and the high voltage transformer L4 are disposed with spaces kept between them, and capacitors C4, C8, C9 where a small amount of heat is generated, and the choke coils L2, L3 are disposed between the components disposed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a power supply device for an external electrode fluorescent lamp for lighting an external electrode fluorescent lamp in which an electrode is provided outside a glass tube.

Figure 5 is a conventional general hot-cathode tube is a fluorescent lamp is a graph showing an emission principle (hereinafter referred HCFL lamp. Ho t Ca thode Fl ourescent La mp). As is well known, the HCFL lamp 1 includes a glass tube 2, a phosphor 3 applied over the entire inner peripheral surface of the glass tube 2, and a pair of filaments provided inside both ends of the glass tube 2. 4. The glass tube 2 contains an inert gas atom and a small amount of mercury atom.

  In the HCFL lamp 1, inert gas atoms and thermoelectrons enclosed in the glass tube 2 are similarly encapsulated by thermionic radiation generated by energizing and heating the filament 4 in the glass tube 2. It collides with a small amount of mercury atoms and is excited to generate ultraviolet rays. This ultraviolet light causes the phosphor 3 on the tube wall to emit light.

In contrast the cold cathode tube (hereinafter, CCFL lamp that. Co ld C athode F lourescent L amp), the filaments without a method to discharge by applying a high voltage to the electrode.
FIG. 6 is a diagram showing a light emission principle of the CCFL lamp 6, and a pair of electrodes 7 are provided inside both ends of the glass tube 2. By applying a voltage to the electrodes 7 at both ends, a discharge is performed at the tip of the electrode 7, and a current flows in the glass tube 2. Further, the cathode fall voltage is large in a portion in the glass tube 2 near the electrode 7 (portion drawn in gray).

  The CCFL lamp 6 can have a smaller electrode structure than the HCFL lamp 1, is thin, has a long lamp life, and has a wide range of uses. However, the CCFL lamp 6 is inferior to the HCFL lamp 1 in terms of luminous efficiency because the cathode fall voltage in the vicinity of the electrode 7 is large as described above.

Figure 7 is an external electrode fluorescent lamp has been attracting attention recently is a graph showing an emission principle (hereinafter referred EEFL lamps. Ex ternal E lectrode F lourescent L amp). In the EEFL lamp 10, electrodes are not provided in the glass tube 2, but electrodes 11 are provided outside both sides of the glass tube 2.
The EEFL lamp 10 is the same cold cathode tube as the CCFL lamp 6 described above, and the principle of light emission is the same. The difference between the two is that the electrode 7 of the CCFL lamp 6 is in the glass tube 2 and electrons also run in the glass tube 2, whereas in the EEFL lamp 10, the electrode 11 is installed outside the glass tube 2, and the glass tube The electrons run outside of 2. As a result, the EEFL lamp 10 is characterized in that the cathode fall voltage is reduced, light is emitted with low power consumption, and the heat generation of the lamp is also extremely reduced.

  As shown in FIG. 8, the CCFL lamp 6 has a negative resistance characteristic that the resistance value decreases as the current increases, as shown in FIG. 8, and therefore, a plurality of CCFL lamps 6 are connected in parallel. However, there is a problem that only one of them is lit.

On the other hand, the EEFL lamp 10 has a positive resistance characteristic as shown in FIG. 9, so that it can be lit even when a plurality of EEFL lamps 10 are connected in parallel. However, the EEFL lamp 10 requires a high-frequency power source of about 60 KHz and a high voltage of about 1.6 KV for driving due to its characteristics.
Therefore, when using AC100V / 200V, which is a commercial power supply, this AC power supply must first be converted into a DC power supply, and further converted into a high voltage and high frequency as a power supply for lighting the EEFL lamp 10.

  In such a case, a loss occurs in each conversion portion, the efficiency is deteriorated, and since this loss becomes heat, a large radiator is required. Originally, since the EEFL lamp 10 has no filament, the tube diameter can be made thinner than that of the HCFL lamp 1 and has various advantages in construction. I didn't make use of the features.

  Examples of the already commercialized power supply unit for driving and lighting the EEFL lamp include Non-Patent Documents 1 and 2 shown below, which are inquired on a homepage.

http://i-front.sekisui.co.jp/sign/html/products/eefl/index.html http://www.lussstation.co.jp/eefl.html

These Non-Patent Documents 1 and 2 are configured by a power supply portion (converter portion) that converts AC100V to DC24V, and an inverter portion that oscillates the DC24V DC power supply to high frequency and converts it to high voltage high frequency. .
That is, in the power supply devices shown in these Non-Patent Documents 1 and 2, the converter part and the inverter part are configured independently, and furthermore, the heat radiation balance of each element is not taken, and it is enlarged. It has become a size configuration.

  This makes it possible to reduce the thickness of lighting fixtures. For example, LCD panels can be designed to be thinner when used in LCD backlights. General lighting, advertising towers, billboards, etc. have the same advantages. It is not possible to make full use of the features of the narrow tube.

  The present invention has been provided in view of the above-mentioned problems, and in order to take advantage of the characteristics of the narrow tube of the EEFL lamp, the power supply circuit is devised to integrate the converter and the inverter, and the EEFL lamp. The present invention is to provide a power supply device for an external electrode fluorescent lamp aiming at realizing a compact power supply device by optimizing a slender substrate and heat radiation balance suitable for the thin tube.

  Therefore, in the power supply device for an external electrode fluorescent lamp according to claim 1 of the present invention, the power supply device 20 used for driving the external electrode fluorescent lamp 10 includes an AC power input unit 31, a rectifying unit 32, and a first Smoothing capacitor C4, switching power supply 34, first choke coil L2, second smoothing capacitor C8, switching transistors Q1, Q2, second choke coil L3, resonant capacitor C9, and high-voltage transformer L4 The above-mentioned components are arranged in a line on the substrate 40.

  3. The power supply device for an external electrode fluorescent lamp according to claim 2, wherein the substrate 40 is formed in an elongated shape, and the width of the substrate 40 is set to smooth capacitors C4, C8, C9, a high voltage transformer L4, and a choke coil. It is characterized by being approximately matched to the width dimensions of L2 and L3.

  In the power supply device for an external electrode fluorescent lamp according to claim 3, the rectifying unit 32, the switching power supply unit 34, the switching transistors Q1 and Q2, and the high-voltage transformer L4 that generate a large amount of heat are arranged at intervals, and each component is It is characterized in that capacitors C4, C8, C9 and choke coils L2, L3 having a small calorific value are arranged between the arrangements.

  In the power supply device for an external electrode fluorescent lamp according to claim 4, the substrate unit 41 in which each of the components is mounted on the substrate 40 is resin-molded, and the substrate unit 41 is mounted and disposed on the surface of the molded resin. It is characterized by being in contact with or in close contact with the inner surface of the metal case 42.

  In the power supply device for an external electrode fluorescent lamp according to claim 5, the power supply device 20 configured in any one of claims 1 to 4 and the external electrode fluorescent lamp 10 driven by the power supply device 20. The lighting fixture main body 51 is comprised, and the thickness of the power supply device 20 and the size of the socket 53 for the external electrode fluorescent lamp 10 are substantially equal.

  According to the power supply apparatus for an external electrode fluorescent lamp according to claim 1 of the present invention, the power supply apparatus 20 used for driving the external electrode fluorescent lamp 10 includes an AC power input section 31, a rectifying section 32, and a first Smoothing capacitor C4, switching power supply 34, first choke coil L2, second smoothing capacitor C8, switching transistors Q1, Q2, second choke coil L3, resonant capacitor C9, and high-voltage transformer L4 The above-described components are arranged approximately in a row on the substrate 40, so that an elongated substrate 40 with a narrow width can be manufactured, and the converter unit 21 constituting the power supply device 20 can be manufactured. And the inverter unit 22 can be integrated, and the substrate 40 corresponding to the thin tube of the EEFL lamp 10 can be provided.

  According to the power supply device for an external electrode fluorescent lamp according to claim 2, the substrate 40 is formed in an elongated shape, and the width dimension of the substrate 40 is set to the capacitors C4, C8, C9, the high-voltage transformer L4, Since the width dimensions of the choke coils L2 and L3 are substantially matched with each other, the width dimension of the substrate 40 is substantially equal to the width dimension of the mounted element, and the width dimension of the substrate 40 can be further reduced. The device 20 can be further miniaturized.

  According to the power supply device for an external electrode fluorescent lamp according to claim 3, the rectifying unit 32, the switching power supply unit 34, the switching transistors Q1 and Q2, and the high-voltage transformer L4 that generate a large amount of heat are arranged at intervals. By disposing the capacitors C4, C8, C9 and choke coils L2, L3 with a small amount of heat generated between the parts, the heat generated from the elements with a large amount of heat can be dispersed, and the optimum heat dissipation design It is possible to prevent thermal adverse effects on other elements. As described above, the converter unit 21 and the inverter unit 22 can be integrated, and the power supply device 20 can be made compact by optimizing the elongated substrate and the heat radiation balance corresponding to the narrow tube of the EEFL lamp 10.

  According to the power supply device for an external electrode fluorescent lamp according to claim 4, the substrate unit 41 in which the respective components are mounted on the substrate 40 is resin-molded, and the surface of the molded resin is mounted on the substrate unit 41. Since it is in contact with or in close contact with the inner surface of the metal case 42 to be disposed, heat from the element having a large heat generation amount is conducted to the case 42 through the resin, and heat dissipation can be promoted efficiently. .

  According to the power supply device for an external electrode fluorescent lamp according to claim 5, the power supply device 20 configured in any one of claims 1 to 4 and the external electrode fluorescence driven by the power supply device 20. Since the lighting fixture body 51 is constituted by the lamp 10 and the thickness of the power supply device 20 and the size of the socket 53 for the external electrode fluorescent lamp 10 are substantially equal, the size of the socket 53 of the external electrode fluorescent lamp 10 A substantially equivalent power supply device 20 can be configured, and the luminaire main body 51 can be made thin, and the installation space can be made slim and compact.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a specific circuit diagram of a power supply device 20 for starting and lighting an EEFL lamp according to the present invention. The power supply device 20 is roughly divided into a converter unit 21 for converting AC100V or AC200V into direct current, and the converter unit. And an inverter unit 22 that converts a direct current power source, which is an output of 21, into a high voltage and high frequency.

As shown in FIG. 1, the main elements of the converter unit 21 are an AC power input unit 31 including a fuse F1, a surge absorber Z1 and an input capacitor C1, and a rectifier including a coil L1, capacitors C2 and C3, and a diode bridge BD1. It comprises a part 32, a smoothing capacitor C4, a switching power supply part 34 comprising a power supply IC, a choke coil L2, and a smoothing capacitor C8.
The main element of the inverter unit 22 includes a pair of switching transistors Q1 and Q2 that oscillate at high frequency, a choke coil L3, a resonant capacitor C9, a high-voltage transformer L4, and an output unit 35.

Among the main elements, the capacitors of the smoothing capacitor C4, the smoothing capacitor C8, and the resonance capacitor C9, and the coil / transformer parts of the choke coil L2, the choke coil L3, and the high-voltage transformer L4 are components having the largest size in terms of configuration. As a substrate for mounting components, an elongated substrate having a size smaller than these components cannot be used. Further, when two of the above elements are arranged in parallel, the substrate becomes twice as wide, and it becomes impossible to form an elongated substrate.
Therefore, in the present invention, in order to set the width of the board to the limit size of these parts, the circuit board is designed so that the respective parts are arranged in an approximate line. Thereby, the width dimension of the substrate 40 becomes substantially equal to the width dimension of the mounted element, and the width dimension of the substrate 40 can be further narrowed, and thus the power supply device 20 can be further miniaturized.

From the point of heat generation of the element, it is necessary to consider heat dissipation because the heat generation amount of the rectifier 32, switching power supply 34, switching transistors Q1, Q2 and high voltage transformer L4 is large. If these elements with large calorific values are arranged close to each other, other elements may be thermally adversely affected. In order to achieve optimal heat dissipation, it is important to arrange the heat source uniformly (equally spaced) within the shape (on the substrate).
Therefore, in the present invention, the rectifier 32, the switching power supply 34, the switching transistors Q1 and Q2, and the high-voltage transformer L4 are each composed of a smoothing capacitor C4, a choke coil L2, a smoothing capacitor C8, a choke coil L3, and a resonance capacitor that generate less heat. C9 is disposed between them to disperse the heat generation. As a result, the heat generated from the element having a large heat generation amount can be dispersed, and the optimum heat radiation design can be achieved, and the thermal adverse effect on other elements can be prevented. As described above, the converter unit 21 and the inverter unit 22 can be integrated, and the power supply device 20 can be made compact by optimizing the elongated substrate and the heat radiation balance corresponding to the narrow tube of the EEFL lamp 10.

FIG. 2 is a plan view when the above components are mounted on the substrate 40. From the left side of the substrate 40, the rectifying unit 32, the switching power supply unit 34, the switching transistors Q1 and Q2, and the high-voltage transformer L4 that generate a large amount of heat are substantially equal. Arranged at intervals, other parts with a small amount of heat generation are arranged between these parts.
The small symbols on the surface of the substrate 40 are silk-printed for component placement.

  As shown in FIG. 3, when each element is mounted on the substrate 40, the size of the substrate unit 41 was about 10 mm in thickness, about 18.5 mm in width, and about 200 mm in length. . The case 42 accommodating the board unit 41 can be formed to have a thickness of about 15 mm, a width of about 22 mm, and a length of about 220 mm. The board unit 41 can be mounted on the board.

Although it may be used as it is as the power supply device 20 for lighting the EEFL lamp in a state where the substrate unit 41 is mounted in the case 42, in the present invention, the substrate unit 41 is mounted in the case 42 and integrated. Resin mold.
The surface of the molded resin is brought into contact with or in close contact with the inner surface of the metal case 42 so that the heat from the heating element is conducted to the case 42 through the resin and further radiated from the outer shell of the case 42. I have to. This eliminates the need for a separate heat radiating member, and thus can facilitate the compactness of the power supply device 20.

  As described above, in the present embodiment, the converter unit 21 and the inverter unit 22 are integrated, and the power supply device 20 can be made compact by optimizing the elongated substrate and the heat radiation balance corresponding to the narrow tube of the EEFL lamp 10. it can.

FIG. 4 shows a luminaire main body 51 in which two EEFL lamps 10 are lit using the power supply device 20. Two power supply devices 20 and two EEFL lamps 10 are placed on the ceiling surface of a thin case 52 having an open bottom surface. The lamp is arranged.
Sockets 53 are attached to both ends of the EEFL lamp 10, and a cord 54 is wired to the socket 53 from the power supply device 20. A power cord 55 having a plug at the tip is led out from the power supply device 20.

Thus, as shown in FIG. 4, the power supply device 20 (inverter power supply unit) substantially the same as the size of the socket 53 of the EEFL lamp 10 can be configured, and the luminaire main body 51 is made thin, the installation space is made slim and compact. Is possible.
In FIG. 4, two EEFL lamps 10 are used. However, one EEFL lamp 10 may be used, or about 3 to 10 EEFL lamps 10 may be used.

It is a specific circuit diagram of the power supply device which consists of a converter part and an inverter part in embodiment of this invention. It is a top view of the board | substrate at the time of mounting the components in embodiment of this invention. (A) and (b) are the top views and side views at the time of mounting a board | substrate in the case in embodiment of this invention. (A) (b) It is the bottom view and side sectional drawing of the lighting fixture main body using the EEFL lamp and power supply device in embodiment of this invention. It is a figure which shows the light emission principle of an HCFL lamp. It is a figure which shows the light emission principle of a CCFL lamp. It is a figure which shows the light emission principle of the EEFL lamp (external electrode fluorescent lamp) in embodiment of this invention. It is a figure which shows the characteristic of a CCFL lamp. It is a figure which shows the characteristic of a CCFL lamp and an EEFL lamp.

Explanation of symbols

10 External electrode fluorescent lamp (EEFL lamp)
20 power supply device 31 AC power input unit 32 rectification unit 34 switching power supply unit 40 board 41 board unit 51 lighting fixture body 53 socket C4 first smoothing capacitor C8 second smoothing capacitor C9 resonant capacitor L2 first choke coil L3 second Choke coil L4 High voltage transformer Q1, Q2 Switching transistor

Claims (5)

The power supply device (20) used for driving the external electrode fluorescent lamp (10) includes an AC power supply input section (31), a rectification section (32), a first smoothing capacitor (C4), and a switching power supply section (34). A first choke coil (L2), a second smoothing capacitor (C8), switching transistors (Q1) (Q2), a second choke coil (L3), a resonant capacitor (C9), a high voltage It consists of a transformer (L4),
A power supply device for an external electrode fluorescent lamp, characterized in that the components are arranged in a line on the substrate (40).   The substrate (40) is formed in an elongated shape, and the width dimension of the substrate (40) is set to the front capacitors (C4) (C8) (C9), the high voltage transformer (L4), and the choke coils (L2) (L3). The power supply device for an external electrode fluorescent lamp according to claim 1, wherein the power supply device is approximately matched to the width dimension of the external electrode fluorescent lamp.   The rectifying unit (32), the switching power supply unit (34), the switching transistors (Q1) (Q2), and the high-voltage transformer (L4) that generate a large amount of heat are arranged at intervals, and the amount of generated heat is small between the components. 3. The power supply device for an external electrode fluorescent lamp according to claim 1, wherein capacitors (C4) (C8) (C9) and choke coils (L2) (L3) are arranged.   A substrate unit (41) in which each component is mounted on the substrate (40) is resin-molded, and the surface of the molded resin is the inner surface of a metal case (42) in which the substrate unit (41) is mounted and arranged. The power supply device for an external electrode fluorescent lamp according to any one of claims 1 to 3, wherein the power supply device is in contact with or in close contact with the external electrode. The lighting apparatus main body (51) is comprised with the power supply device (20) comprised in any one of the said Claim 1 to 4, and the external electrode fluorescent lamp (10) driven by this power supply device (20). And the thickness of the said power supply device (20) and the size of the socket (53) for external electrode fluorescent lamps (10) are substantially equivalent, The power supply device for external electrode fluorescent lamps characterized by the above-mentioned.

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