JPH0321036Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention has lamp voltages of 6 volts, 12 volts,
Or it relates to so-called low-volt mini halogen light fixtures of about 24 volts.

Low voltage mini halogen lamps have a lamp voltage of
Compared to regular 100-volt incandescent bulbs and 100-volt halogen bulbs, they are smaller, have a longer lifespan, and are more economical, so they are widely used as a light source for spot lighting equipment. However, in appliances using such low-volt mini halogen lights,
A transformer is required to step down the distribution voltage, and conventionally, this transformer uses an external iron type transformer whose primary winding and secondary winding are completely insulated. Therefore, there are problems such as the high cost and large volume of the transformer, making it difficult to integrate it into a lighting fixture.

This invention solves the problems of conventional low-voltage mini halogen lamps as described above, and is compact and
It is an object of the present invention to provide a mini halogen lamp that is easy to manufacture and can be made at low cost.

This invention uses an autotransformer, its series winding and shunt winding (primary/secondary common winding) are each divided into two parts, the iron core is an inner iron type, and each of the two leg irons is divided into two parts. The series winding and the shunt winding divided into two are wound with the shunt winding in the lower layer, and each of these windings is connected in series so that the shunt winding is in the center of the total winding, A mini halogen lamp is connected between both ends of the shunt winding of the autotransformer constructed in this manner.

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows an equivalent circuit of a transformer used in the present invention, and FIG. 2 shows a longitudinal sectional view thereof. As shown in Figure 1, the winding of the transformer 1 is divided into two series windings 2 and 2' with a relatively thick wire diameter, and a series winding 2 with a relatively thin wire diameter.
It consists of divided shunt windings (common windings) 3 and 3', and these two divided series windings 2 and shunt windings 3, and series windings 2' and shunt windings 3'. As shown in FIG. 2, these two
The four bobbins 6, 6' are fitted into the two leg irons 8, 8' of the square-shaped inner iron core 7, and the shunt windings 3, 3' are placed in the center of the total winding. The windings are connected in series at the end of each winding to form an autotransformer 1, whose primary terminals 4 and 4' are connected to the power supply, and whose secondary low-voltage terminals 5 and 5' are connected to the mini-halogen lamp. connected to.

Fig. 3 is a sectional view of an example of a spot lighting device according to the present invention in which the above-mentioned transformer and halogen lamp socket are integrated into one container, Fig. 4 is its circuit diagram, and Fig. 5 is its external appearance. FIG. In these figures, 1 is an autotransformer configured as explained in connection with FIGS. 1 and 2, 9 is a terminal plate, and two divided shunt windings 3, 3 of the autotransformer 1 are connected. A protective device 10 such as a temperature fuse is connected between the transformer 1 and the halogen lamp socket 11 connected between the low voltage side terminals 5 and 5 of the transformer 1, and the halogen lamp socket 11 is housed in a cylindrical container 12. , the whole is assembled into one piece by filling with an insulating filler 13 having good thermal conductivity such as polyester compound. This filler 13 serves to quickly dissipate the heat of the transformer 1 and the socket 11 to the outside, thereby preventing the temperature of the transformer and the socket from rising. In addition, 14 is a low-pressure mini halogen lamp, 15 is a heat insulating material provided surrounding the halogen lamp to prevent the heat of the mini halogen lamp 14 from being transmitted to the socket or transformer, 16 is a light condensing reflector, and 17 is a The legs 18 that support the container 12 are pedestals.

The present invention is constructed as described above and provides the following effects.

1 Because the transformer is an inner iron type, the diameter of the winding is smaller than that of an outside iron type, in which the series winding and shunt winding are all wound on one leg iron, so the winding The length of copper wire needed to connect the wires can be shortened.

2. Since the shunt winding is located in the center of the total winding, even if one line of the distribution line is grounded, the voltage to ground on the low voltage side is always approximately 1/2 of the power supply voltage, so the insulation on the low voltage side is Easy and low insulation cost.

3. Even if the shunt winding is located in the center of the total winding, the shunt winding and series winding are each divided into two parts and wound on separate bobbins, so the two low-voltage sides can be connected from the middle of the total winding. When taking out the terminal, 1 from one bobbin
Since it is only necessary to pull out one terminal, it is easy to pull out.

4 Series windings that often cause electrical loss are 2
In addition, it is located outside the shunt winding and has a large area in contact with the outside air, allowing for good heat dissipation.

5. From the above, the transformer as a whole can be made small, and it can be easily incorporated into lighting equipment, and the cost can be reduced.

[Brief explanation of the drawing]

Figure 1 is an equivalent circuit of the transformer portion of the low-voltage mini halogen lamp of the present invention, Figure 2 is a longitudinal cross-sectional view of the transformer, and Figure 3 is a longitudinal cross-section of an embodiment of the low-voltage mini-halogen lamp of the present invention. Figure 4 is the circuit diagram, Figure 5 is the circuit diagram.
The figure is an external perspective view. 1...Auto transformer, 2, 2'...Series winding, 3,
3'...Shunt winding, 4, 4'...Power terminal, 5,
5'...Low voltage terminal, 6,6'...Bobbin, 7...Inner iron core, 8,8'...Leg iron, 10...Protective device,
11...Lamp socket, 12...Container, 13...
...Filling material, 14...Low pressure mini halogen lamp, 15...
...insulation material.

Claims (1)

[Scope of utility model registration request] Each of the series winding and shunt winding of the autotransformer is divided into two parts, and each of the series winding and shunt winding divided into two parts is connected to each of the two leg irons of the core type iron core as a shunt winding. The windings are connected in series so that the two divided shunt windings are in the center of the total winding, and a halogen lamp is connected between both ends of the shunt windings connected in series. A low-pressure mini halogen light fixture that is connected.