JPH0546239Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field This invention relates to a dimmer that changes the illuminance of a lighting fixture by changing the phase angle of an AC voltage, and is particularly applicable to a wall-mounted type that is directly attached to a wall. Regarding a light control device.

(b) Prior art Generally, when changing the illuminance of lighting equipment continuously, a dimmer equipped with a known phase control circuit is used, and for home use or small-scale shops, a wall-mounted dimmer is used. A dimmer is used. The phase control circuit of this dimming device is composed of a thyristor such as a triac and a gate trigger circuit that applies a trigger pulse to the thyristor.The gate trigger circuit includes, for example, a semiconductor element such as a UJT or PUT, a variable resistor It consists of a capacitor.
The gate trigger circuit outputs a trigger pulse at a timing corresponding to the resistance value set by the variable resistor and the capacitance of the capacitor, and the triac is turned on at this timing. Therefore, by changing the resistance value of the variable resistor, the on-timing of the triax can be changed and the power applied to the lighting device can be increased or decreased. Since the above-mentioned gate trigger circuit generates high-frequency radio noise, a filter circuit including a chiyoke coil is generally provided for the purpose of absorbing this radio noise.

(c) Problems to be solved by the invention However, the triax and choke coils constituting the phase control circuit and filter circuit included in the above-mentioned dimmer become a large heat source in a dimmer with a relatively large capacity. In a wall-mounted light control device, the surface panel may become deteriorated or discolored, so it is necessary to effectively dissipate the heat emitted from the triax and choke coil. For this reason, conventional light control devices are equipped with a mounting plate made of a flat plate with high thermal conductivity on the back, and the electrical components that make up the circuit are fixed to the back of this mounting plate. The constructed mounting plate could not provide a large surface area necessary to obtain sufficient heat dissipation effect, and the decorative board on the surface sometimes discolored after long-term use. Further, as the capacity of the light control device increases, it is necessary to increase the size of the chiyoke coil, and increasing the size of the chiyoke coil also causes an increase in the amount of heat generated. Therefore, it has been difficult to increase the capacity with conventional light control devices that cannot obtain a sufficient surface area.

The purpose of this invention is to prevent heat from being conducted to the surface of the device by increasing the heat dissipation effect of the heat generated from the electrical components on the back of the device.
An object of the present invention is to provide a light control device that can realize an increase in capacity by increasing the size of a chiyoke coil that is a heat source.

(d) Means for solving the problem In the light control device of this invention, a phase control circuit including heat-generating electric components is fixed to the back of the mounting plate via a substrate, and the phase angle of the AC voltage applied to the lighting equipment is changed. In a light control device that changes the illuminance of a lighting fixture, heat-generating electrical components of a phase control circuit are fixed to both ends of the board, and heat dissipation fins are fixed to positions near both ends of the board on the back of the mounting plate. It is characterized by what it did.

(e) Effect In this invention, in a phase control circuit that is fixed to the back surface of the circuit via a board, the heat-generating electric components are located at both ends of the board. In the mounting plate, heat dissipation fins are fixed to positions near both side ends of the board. Therefore, the heat generated from the heat-generating electrical components is first conducted to a position on the mounting plate facing both ends of the board, and then to the heat dissipation fins fixed near this position. The heat dissipation fins fixed to the mounting plate expand the surface area of the mounting plate near both ends of the substrate, thereby improving the heat dissipation effect of the mounting plate in this area. Therefore, most of the heat generated by the heat generating electrical components is quickly radiated through the mounting plate and the heat radiation fins.

(f) Embodiment FIGS. 1 and 2 are an assembled view in the rear direction and an external view in the front direction, respectively, of a light control device which is an embodiment of this invention.

The light control device 1 is formed by fixing a frame 4, a decorative panel 5, and a switch panel 6 to a mounting plate 15, and a light control knob 2 and a switch 3 are exposed from the switch panel 6 to the surface. Mounting plate 15
is made of a material with high thermal conductivity such as Al. On the back side of this mounting plate 15 are a switch coil 9, a variable resistor 10, and a switch body 12.
Electrical components constituting the phase control circuit, such as the triax 13 and the like, are fixed via the substrate 11. Among the electrical components constituting these phase control circuits, the chain coil 9 and the triax 13 are the main sources of heat generation. The chiyoke coil 9 is connected to the substrate 11
The triax 13 is fixed to the left side of the substrate 11. Mounting plate 15
In the chain coil 9 and triax 1
Heat dissipation fins 7 are fixed at positions near both sides of the substrate including 3. The heat dissipation fin 7 is made of a material such as Al that has high thermal conductivity.
The surface area of the mounting plate is expanded near both sides of the board.

According to this invention with the above structure, the heat generated by the chain coil 9 and the triax 13 is conducted to a position on the mounting plate 15 facing the chain coil 9 and the triax 13, and is diffused within the mounting plate 15. At this time, the heat dissipation fin 7 is located on the back surface of the mounting plate 15 near the position where the heat of the chain coil 9 and the triax 13 is conducted, and the heat conducted to the mounting plate 15 is mainly transmitted to the heat dissipation fin 7. Therefore, most of the heat generated from the chain coil 9 and the triax 13 is radiated to the atmosphere via the mounting plate 15 and the heat radiation fins 7. Therefore, only a portion of the heat generated from the phase control circuit is conducted to the surface side of the mounting plate 15, and the decorative panel 5 and the switch panel 6 will not deteriorate or discolor even after long-term use. . Further, by improving the cooling effect by the radiation fins 7, it is possible to increase the capacity by increasing the size of the chiyoke coil 9.

Note that the heat radiation effect can be further improved by applying a dark-colored paint to the heat radiation fins 7.
Furthermore, by using this paint as an insulating paint, short circuits due to contact with lead wires can be prevented. Furthermore, the angle of the fins can be blunted by applying paint, thereby preventing damage to the lead wires.

(g) Effects of the invention According to this invention, the heat generated from the heat-generating electrical components constituting the phase control circuit is mainly conducted from the mounting plate to the heat radiation fins, and is effectively radiated at the back surface of the mounting plate. Therefore, only a portion of the heat generated from the heat-generating electrical components is transmitted to the surface side of the mounting plate, and the panel etc. fixed to the surface side of the mounting plate will not undergo deterioration or discoloration. Moreover, the cooling effect can be improved by expanding the surface area by the heat dissipating fins, and the capacity can be increased by increasing the size of the heat-generating electrical components.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are an assembly view of a light control device according to an embodiment of the invention, respectively, showing an assembled view in the rear direction and a front external view. 1... Light control device, 7... Heat dissipation fin, 11...
Board, 13...Triack.

Claims (1)

[Claims for Utility Model Registration] Dimming that changes the illuminance of a lighting device by fixing a phase control circuit including heat-generating electrical components to the back of a mounting plate via a substrate and changing the phase angle of an AC voltage applied to the lighting device. A light control device, characterized in that heat-generating electrical components of a phase control circuit are fixed to both ends of the substrate, and heat dissipation fins are fixed to positions near both ends of the substrate on the back side of the mounting plate.