JP5110383B2 - Electrical equipment and lighting equipment - Google Patents

Description

  The present invention relates to an electric device including a switching element and a lighting fixture configured using a discharge lamp lighting device that employs the configuration of the electric device.

  In a lighting circuit of a discharge lamp lighting device, which is an electrical device that lights a discharge lamp, a switching element is used for power conversion or the like. This switching element generates a large amount of heat and is used by being disposed on a heat sink.

  And the mold part of the switching element is arranged on the side wall side in the base case, and the terminal of the switching element is arranged at a position beyond the central part of the circuit board (FIGS. 6, 17, and 18 of Patent Document 1). reference).

When only a main part is shown in a plan view, as shown in FIG. 4, a substantially L-shaped heat radiation plate 92 is screwed and coupled to the side wall 91 of the base case, and the switching element 90 is mounted on the heat radiation plate 92. It is placed and fixed to the heat sink 92 with screws 93. Further, the heat radiating plate 92 is fixed to the circuit board 94 with two screws 95, 95. Further, the terminal 96 of the switching element 90 is disposed at a position beyond the central portion of the circuit board 94.
Japanese Patent Laid-Open No. 2003-197027 (FIGS. 6, 17 to 20, 0038 to 0045)

  As the switching element, a field effect transistor (FET) is generally used, and it is known that heat generation at the drain terminal is particularly high. In consideration of the thermal influence due to the heat generation, other components, wiring patterns, and the like need to be provided at positions away from the terminals 96 by a predetermined distance or more. For this reason, unless the dimension L from the position where the terminal 96 is inserted into the circuit board 94 to the far end edge portion of the circuit board 94 is increased, it is not possible to provide components or wiring patterns here.

  Under such circumstances, in the conventional discharge lamp lighting device, it is difficult to reduce the size (thinning) of the circuit board 94, and eventually a problem arises that the luminaire constructed using the circuit board 94 is increased in size. It was. As a countermeasure, it is considered that the switching elements are vertically arranged on a circuit board (see FIGS. 19 and 20 of Patent Document 1). However, according to such a configuration, it is necessary to increase the height of the base case, and the problem that the lighting fixture becomes large remains.

  The present invention has been made as a solution to the problems in the conventional discharge lamp lighting device as described above, and its purpose is to make it possible to reduce the size of the circuit board on which the switching element is mounted and to reduce the size of the case. It is an object of the present invention to provide an electric device that can appropriately dissipate heat without changing. Furthermore, an object of the present invention is to provide a lighting fixture that is configured using a discharge lamp lighting device that employs the configuration of the electrical device.

An electric device according to the present invention is provided with a circuit board on which a planar shape is formed in a rectangular shape and an electric circuit is mounted; a case that houses the circuit board; and one long side of the circuit board that is erected has a planar portion continuing bent from the standing portion and the standing portion, the heat radiating plate fixing hole in the plane portion between the standing portion and the flat portion is provided, the standing A heat dissipation plate whose portion is fixed to the inner wall surface of the case by a first screw and thermally connected; and a portion of the electric circuit and the direction of the terminal extending from the mold portion coincides with the longitudinal direction of the circuit board And a switching element mounted on a circuit board, and fixed to the heat sink only by the second screw in a state where at least a part of the mold portion is located on the flat portion of the heat sink,
The heat sink fixing hole of the heat sink is between the standing part of the heat sink and the flat part of the heat sink to which the mold part of the switching element is fixed, and is parallel to the longitudinal direction of the circuit board. The heat radiation plate is provided at two places , and the third and fourth screws different from the second screw are connected and fixed to the circuit board via the two heat radiation fixing holes. And

  The direction of the terminal extending from the mold part is made to coincide with the longitudinal direction of the circuit board and is mounted on the heat sink, which means that the switching element is arranged so that the longitudinal direction of the switching element coincides with the longitudinal direction of the circuit board. means. The switching element is not limited to a field effect transistor (FET), but generates heat due to the current flowing through the terminal, and all other components and wiring patterns need to be provided at positions away from the terminal by a predetermined distance or more. Including the elements. Circuit boards include those having wiring patterns on the front and back surfaces and multilayer boards.

  A lighting apparatus according to the present invention comprises a discharge lamp lighting device configured using the electrical apparatus according to claim 1, comprising an electric circuit as a lighting circuit for lighting a discharge lamp; and a discharge lit by the discharge lamp lighting device. A lamp; and a discharge lamp lighting device and an appliance main body in which the discharge lamp is arranged.

  According to the electrical device according to the present invention, since the direction of the terminal extending from the mold part in the switching element is made to coincide with the longitudinal direction of the circuit board and is mounted on the heat sink, the circuit board is mounted from the position of the switching element. In order to avoid the influence of heat generation at the terminal, the restriction that other parts and wiring patterns cannot be placed can be almost eliminated, and other parts and wiring patterns etc. can be placed up to the edge on the opposite side. Therefore, it is possible to reduce the size of the circuit board without increasing the size of the circuit board. Further, it is not necessary to increase the height (length) of the case.

  According to the lighting apparatus according to the present invention, the discharge lamp lighting device having a configuration in which the direction of the terminal extending from the mold portion in the switching element is mounted on the heat sink so as to coincide with the longitudinal direction of the circuit board is adopted. Therefore, it is possible to reduce the size of the circuit board without increasing the size of the circuit board. Further, it is not necessary to increase the height (length) of the case.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an illuminating device constituted by using an electric apparatus according to the present invention and a discharge lamp lighting device having the arrangement of the electric apparatus will be described below with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description is omitted. The electric apparatus according to the embodiment of the present invention is realized as the discharge lamp lighting device 1. As shown in the perspective view of FIG. 1, the discharge lamp lighting device 1 has a configuration in which a lighting circuit 2 is provided in a box-like case 10 whose upper side is open.

  The lighting circuit 2 is obtained by mounting the electrical components 12 to 16 and 30 on the circuit board 11 in the illustrated range. The lighting circuit 2 includes a power supply unit for lighting a discharge lamp (not shown), and a necessary voltage. Is generated and the discharge lamp is turned on. The circuit board 11 has a rectangular shape whose longitudinal direction is the horizontal direction in the state of FIG.

  The electrical component indicated by reference numeral 30 is an FET 30 as a switching element, and includes a flat plate-shaped mold portion 31 and three terminals 32 protruding from the mold portion 31. The FET 30 is mounted on the substrate 11 such that the direction of the terminal 32 extending from the mold part 31 is aligned with the longitudinal direction of the circuit board 11 and at least a part of the mold part 31 is located on the heat sink 40. .

  The heat radiating plate 40 is made of, for example, an aluminum plate, and an upright portion 41 that is bent in an L shape is provided with one of the two long sides of the circuit board 21 as a back, with respect to the side wall plate 10 a of the case 10. Screwed by screws 52.

  A plan view of only the FET 30 among the electrical components 12 to 16, 30 shown in FIG. 1 mounted on the circuit board 11 is as shown in FIG. As shown in FIG. 2, since the mounting direction of the FET 30 is different from the conventional example, the two long sides of the rectangular mold portion 31 coincide with the longitudinal direction of the circuit board 11. Therefore, the distance from the long side 22 where the heat radiating plate 40 is not provided to the FET 30 among the two long sides of the circuit board 11 is extremely long. Conventionally, this is greatly different from the arrangement configuration in which the FET 30 occupies a position beyond the center of the circuit board 11.

  From another viewpoint, since the FET 30 is arranged so that the two short sides of the rectangular mold part 31 are orthogonal to the longitudinal direction of the circuit board 11, the heat sink 40 is erected on the long side of the mold part 31. The distance from one long side close to the portion 41 to the standing portion 41 is made larger than in the past. Screw holes 43 and 43 are formed in the flat portion 42 close to the standing portion 41 generated by this configuration, and the circuit board 11 and the heat sink 40 are coupled by screws.

  The flat portion 42 of the heat sink 40 has a substantially flat area of the mold portion 31 of the FET 30 except for the portion where the screw holes 43 and 43 are formed. Furthermore, the size of the standing portion 41 of the heat sink 40 is also shortened in accordance with the width of the joint portion 43 with the flat portion 42, the overall size of the heat sink 40 can be reduced, and the cost can be reduced. it can. The FET 30 is fixed to the heat radiating plate 40 by screws 8 inserted into holes formed in the mold part 31.

  Since the structure is provided as described above, the distance from the long side 22 where the heat sink 40 is not provided to the FET 30 among the two long sides of the circuit board 21 is extremely long. Can be arranged with a margin. Further, it is possible to reduce the size by removing the remaining part after arranging other components and wiring patterns in the above part.

  According to the configuration of this embodiment, other components and wiring patterns need to be provided at a position away from the terminal 32 by a predetermined distance or more with respect to the vicinity of the terminal 32 of the FET 30. There is almost no need to make it larger. That is, the length of the heat sink 40 of this embodiment is shorter than the length of the heat sink of the conventional example along the longitudinal direction of the circuit board. Specifically, as apparent from comparison between FIG. 2 and FIG. 4, the length of the heat sink of the conventional example along the longitudinal direction of the circuit board is the head of the mold portion 31 of the FET 30 in the arrangement according to the present embodiment. It is about the length from the portion to the tip of the terminal 32. Therefore, although other parts and wiring patterns cannot be arranged within a certain range from the tip of the terminal 32, instead of this part, the range from the long side 22 where the heat sink 40 is not provided to the FET 30 is provided. The size can be reduced as a whole.

  In FIG. 3, the Example of the lighting fixture which concerns on this invention is shown. The luminaire 3 is a luminaire directly attached to a ceiling surface or the like, and a pair of lamp sockets 18 and 18 are provided at both ends of a substantially frame-like fixture body 17. A straight tube fluorescent lamp 19 as a discharge lamp is mounted on the lamp sockets 18 and 18. In addition, the instrument body 17 is provided with a reflecting plate 20 having a substantially dish-shaped cross section facing the fluorescent lamp 19, and the surface of the reflecting plate 20 is a reflecting surface 20a.

  Moreover, the instrument main body 17 is fixing the discharge lamp lighting device 1 shown in FIG. 1 in the attachment hole provided in the case 10 inside the reflector plate 20 with a through screw. When the discharge lamp lighting device 1 is supplied with power, the fluorescent lamp 19 is lit.

  The lighting fixture 3 can easily secure an installation space by reducing the size of the discharge lamp lighting device 1 and can be formed at low cost by reducing the cost of the discharge lamp lighting device 1.

The perspective view which shows the principal part structure in the Example of the discharge lamp lighting device which is an electric equipment which concerns on this invention. The top view which shows the principal part structure in the Example of the discharge lamp lighting device of FIG. The perspective view which shows the structure of the lighting fixture comprised using the Example which concerns on the discharge lamp lighting device of this invention. The top view which shows the principal part structure in the conventional discharge lamp lighting device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Discharge lamp lighting device 2 Lighting circuit 3 Lighting fixture 10 Case 11 Circuit board 30 FET which is a switching element
31 Mold part 32 Terminal 40 Heat sink

Claims (2)

A circuit board having a rectangular planar shape and an electric circuit mounted thereon;
A case for storing a circuit board;
One provided on the long side of the circuit board, has a planar portion continuing bent from upright the standing portion and the standing portion, the flat portion between the standing portion and the planar portion with heat radiation fixing holes are provided, and thermally connected to the heat radiating plate above standing portion is fixed by the first screw into the case inner wall surface;
The heat radiating plate in a state in which a part of the electric circuit is configured and a direction of a terminal extending from the mold part is aligned with a longitudinal direction of the circuit board and at least a part of the mold part is located on a flat part of the heat radiating plate And a switching element fixed to the circuit board only by a second screw and mounted on the circuit board,
The heat radiation fixing hole of the heat sink is between the standing part of the heat sink and the flat part of the heat sink to which the mold part of the switching element is fixed, and is parallel to the longitudinal direction of the circuit board. Provided,
The heat radiating plate is connected and fixed so that the third and fourth screws different from the second screw are separated from the other long side of the circuit board through the two heat radiating fixing holes. Electrical equipment characterized by that. A discharge lamp lighting device comprising an electric circuit as a lighting circuit for lighting a discharge lamp;
A discharge lamp lit by the discharge lamp lighting device;
A lighting fixture comprising: a discharge lamp lighting device; and a fixture main body on which the discharge lamp is arranged.

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