JPS589558B2 - tatouyohodentoadoutentouchi - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multiple discharge lamp lighting device.

Fig. 1 shows an example of a conventional two-lamp discharge lamp lighting device, in which power supply windings 1a and 2a of auto-leakage transformers 1 and 2 are connected to an AC power supply E, and the output side of the transformer is Discharge lamps L1 and L2 are respectively connected as loads.

In this case, the output voltage V21 of the autovolume leaky transformers 1 and 2,
Since V22 must be selected at a relatively high voltage that can sufficiently start the discharge lamps L1 and L2, the transformer becomes large and the entire device becomes large.

Therefore, an object of the present invention is to provide a multiple discharge lamp lighting device that can be made smaller and lighter.

FIG. 2 is a circuit diagram of an embodiment of the multi-discharge lamp lighting device of the present invention. The difference from FIG. In addition, a voltage transfer impedance Z is connected between the output end of the leaky transformer 1 and the starting end (switch S side) of the output winding 3b of the leaky transformer 3.

Since the other parts are the same, the same or corresponding parts are given the same reference numerals.

In operation, the leaky transformer 1 is exactly the same as that shown in Fig. 1, so it has enough voltage to start the discharge lamp L1, and when the AC power supply E is supplied, it starts and lights up normally. leading to.

Next, considering the voltage applied across the discharge lamp L2, if the switch S is open, the voltage induced in the output voltage V21 of the transformer 1 and the output winding 3b of the transformer 3 will be will be applied via impedance Z.

In this case, since the voltage V21 is high enough to start the discharge lamp L, it is clear that since a voltage equal to or higher than the voltage V21 is applied to the discharge lamp L2 of the same type as the discharge lamp L1, it will surely start. .

Then, if the switch S is closed after the discharge lamp L2 is started,
The discharge lamp circuit is the same as the one in Figure 1, and the discharge lamp L
2 can be switched to normal lighting using a transformer 3.

Here, since the voltage transmission impedance Z only transmits voltage to the discharge lamp L2 and starts the discharge lamp L2, it is sufficient to have a relatively high impedance value. Therefore, after the switch S is closed, the discharge lamp L1 , L2, mutual electrical interference can be ignored.

In this manner, in the embodiment of FIG. 2, the discharge lamp L2 can be started using the output voltage V21 of the transformer 1, so the output voltage V22 of the transformer 3 can be sufficiently reduced.

That is, the transformer 3 changes the number of turns of the output winding 3b to the discharge lamp L2.
Since the light can be reduced to the minimum value that can maintain the lighting, the device can be made smaller and lighter, and power loss can also be reduced.

In addition, since the voltage V21 after lighting of the discharge lamp L1 decreases to the lamp voltage of the discharge lamp L1, the voltage applied to the discharge lamp L2 is also equal to the lamp voltage of the discharge lamp L1 and the output winding 3 of the transformer 3.
If it is possible that the voltage will drop to the sum of the voltages b, and if it is difficult to start the discharge lamp L2 due to this reduced voltage, connect a capacitor (not shown) in series with the discharge lamp circuit including the discharge lamp L1. In addition to being able to hold the voltage V21 by inserting the transformer into a phase advance circuit, the transformer 1 is not a single-turn leaky transformer, but a simple single-turn transformer, and a current-limiting element such as a choke coil (not shown) is used. ), the above-mentioned concerns can be easily resolved.

Furthermore, it is natural that the switch S can be automatically opened and closed by using a semiconductor switching element such as a triac, and after the discharge lamps L1, L, and 2 are turned on, the impedance Z can be adjusted as necessary. It is also possible to remove it from the circuit.

Furthermore, when starting the discharge lamp L2, a high voltage corresponding to the sum of the output voltage V21 of the transformer 1 and the voltage of the output winding 3b of the transformer 3 is applied to the discharge lamp L2 as described above. Its starting ability is extremely large, and in some cases it is possible to start a discharge lamp L2 that is longer in size than the discharge lamp L1, and this invention is applicable not only to discharge lamps of the same type but also to combinations of discharge lamps of different types. I understand that.

Fig. 3 shows an embodiment in which the present invention is applied to a multi-lamp system with three or more lamps.The difference from Fig. 2 is that the power supply windings of the transformers are collectively shared by the transformer 4, and the output windings 4 , 5... are made into multi-winding wires, respectively, and switches S4, S5,...
...and impedance 24, 2, ...
It has the same operation and effect as the one shown in Fig. 2.

As described above, according to the multiple discharge lamp lighting device of the present invention, it is possible to reduce the size and weight, and it is possible to reduce power loss.

[Brief explanation of drawings]

Figure 1 is a circuit diagram of a conventional two discharge lamp lighting device, Figure 2 is a circuit diagram of an embodiment of a multiple discharge lamp lighting device of the present invention, and Figure 3 is another embodiment of the present invention. FIG. 1, 3...Leaky transformer, L1, L2...
・Discharge lamp, S...Switch, Z...Voltage transfer impedance.

Claims (1)

[Claims] 1 a first autotransformer that generates an output voltage that can start the first discharge lamp; a second autotransformer that generates an output voltage that can keep the second discharge lamp lit; A voltage transfer impedance connected between the starting end of the output winding of the second autotransformer and the terminal end of the output winding of the first autotransformer, and the output of the second autotransformer. A multiple discharge lamp lighting device comprising: a switch connected between a starting end of a winding and a terminal end of a power supply winding and closed after the second discharge lamp is started.