JPH0329917Y2 - - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a discharge lamp lighting device.

In this type of device, two transformers forming a ballast with primary coils connected to a common power source are prepared, and a first transformer is connected between one end of each of the secondary coils.
A discharge lamp is connected, a second discharge lamp is connected between the other ends of each secondary coil, and a capacitor for sequential lighting is connected in parallel to one of the discharge lamps, and each of the transformers is connected. A configuration in which each device is housed in an independent case is already well known. In this case, when connecting the capacitor for sequential lighting directly in parallel with one discharge lamp, a crossover wire is required between the cases housing each transformer, so to avoid this, connect the capacitor via the power supply wire. A configuration is being considered in which the discharge lamp is connected in parallel with the discharge lamp.

Figure 1 shows a circuit diagram for this purpose, where 1 is a power source for lighting, 2A and 2B are power lines, 3 and 4 are transformers that constitute ballasts each housed in a separate case, and 5 and 6 are radiation sources. 7 is a capacitor for stabilizing discharge, and 8 is a capacitor for sequential lighting.
Each primary coil 3A, 4A of transformer 3, 4 is wire 1
Power line 2 via 1A, 11B, 12A, 12B
Connected to A and 2B. Also, the secondary coil 3B,
Among the ends a to d of 4B, discharge lamps 5 and 6 are connected between ends a and d and between ends b and c.
A power supply line 2A is used to connect the capacitor 8 for sequential lighting to the discharge lamp 6 in parallel. That is, the wire 11A connected to the power supply line 2A is connected to the end b of the secondary coil 3B via the wire 13, and also the power supply line 2A
The wires 12A connected to the secondary coil 4B are connected to the ends c of the secondary coil 4B via the capacitor 8, respectively.

According to the above configuration, the capacitor 8 is connected to the discharge lamp 6.
In order to connect the transformers 3 and 4 in parallel, it is no longer necessary to connect the transformers 3 and 4 directly between the cases housed separately. And when starting,
Secondary coil 3B, wires 13, 11A, power line 2A,
The circuit that leads to the secondary coil 3B via the wire 12A, the capacitor 8, the secondary coil 4B, the capacitor 7, and the discharge lamp 5 connects the secondary coils 3B and 4B to the discharge lamp 6.
A voltage that is the sum of the induced voltages is applied, and thereby the discharge lamp 5 starts discharging. Then, the impedance of the discharge lamp 5 decreases, so the secondary coil 3
B, discharge lamp 5, capacitor 7, secondary coil 4B,
A voltage that is the sum of the induced voltages of the secondary coils 3B and 4B is applied to the discharge lamp 6 by a circuit that passes through the discharge lamp 6 and reaches the secondary coil 3B, and the discharge lamp 6 also starts discharging. As a result, both discharge lamps 5 and 6 shift to the lighting state.

However, in such a configuration, a problem arises when mounting the discharge lamp 6 in the socket. That is, for example, one pin of the discharge lamp 6 is connected to the secondary coil 3B.
After first inserting it into the socket on the end b side of
Suppose that the other pin accidentally touches the case housing the transformer 4 before inserting the other pin into the socket on the end c side of the secondary coil 4B. Generally, this type of case is grounded, so the discharge lamp 6 is directly connected to the power supply 1 through a circuit that leads to the power supply line 2A, the lines 11A and 13, the discharge lamp 6, the case, and the ground. In such a state, an excessive current may flow through the discharge lamp 6 and the discharge lamp 6 may be damaged. Note that first insert one pin of the discharge lamp 6 into the socket on the end c side of the secondary coil 4B, and then insert the other pin into the socket on the end b side of the secondary coil 3B before inserting the transformer 3 into the socket. If the other pin mentioned above touches the case storing the
This prevents excessive current from flowing to the Therefore, in this case, damage to the discharge lamp 6 is avoided.

The purpose of this invention is to ensure that the discharge lamp is not damaged even if one pin is accidentally grounded when the discharge lamp is installed in a circuit that does not include a crossover wire that directly crosses the discharge lamp. .

The capacitor for sequential lighting of this invention is divided into two parts,
Each of these is connected between each end of the discharge lamp and the same power line.

An embodiment of this invention will be explained with reference to FIG.
Note that parts given the same reference numerals as in FIG. 1 indicate the same or corresponding parts. As can be understood from the diagram, capacitors 8A and 8B are used as capacitors for sequential lighting.
Use. The capacity of each capacitor is twice that of capacitor 8 in FIG. and power line 2
A and each end of the discharge lamp 6. Specifically, capacitor 8B is connected to the same location as capacitor 8 in FIG.
A is connected to line 13 in FIG.

In the above configuration, when starting, the secondary coil 3
A circuit including B, capacitor 8A, wire 11A, power supply wire 2A, wire 12A, capacitor 8B, secondary coil 4B, capacitor 7, discharge lamp 5, and secondary coil 3B is completed in the same manner as shown in FIG. capacitor 8
Since the series combined capacitance of A and 8B is the same as the capacitance of the capacitor 8, the discharge lamp 5 starts discharging first as in FIG. After this, the discharge lamp 6 starts discharging, and both the discharge lamps 5 and 6 shift to a lighting state. That is, in this configuration as well, both discharge lamps can be turned on sequentially without using a crossover wire that directly straddles the discharge lamps, as in FIG. 1.

Next, when installing the discharge lamp 6, suppose that one pin is first inserted into the socket on the side of the secondary coil 3B, and then the other pin is touched to the case housing the transformer 4. At this time, the discharge lamp 6 will be connected to the power source 1 via the capacitor 8A. Therefore, the impedance of the capacitor 8A acts to prevent excessive current from flowing into the discharge lamp 6 from the power supply 1, thereby avoiding damage to the discharge lamp 6. discharge lamp 6
When the capacitor 8B is inserted from the opposite pin, the capacitor 8B is connected between the discharge lamp 6 and the power source 1.
This is the same as in the case of FIG. 1, and needless to say, damage to the discharge lamp 6 can be avoided in this case as well.

As detailed above, according to this invention, even if the crossover wire is omitted and the power line is used, damage to the discharge lamp can be reliably prevented even if the discharge lamp is accidentally grounded when installed. It produces the desired effect.

[Brief explanation of the drawing]

FIG. 1 is a conventional circuit diagram, and FIG. 2 is a circuit diagram showing an embodiment of this invention. 1...Power supply, 2A, 2B...Power line, 3, 4...
...Transformer, 3A, 4A...Primary coil, 3B,
4B...Secondary coil, 5,6...Discharge lamp, 8A,
8B...Capacitor for sequential lighting.

Claims (1)

[Claims for Utility Model Registration] A pair of transformers constituting a pair of ballasts each having a primary coil connected to the same power line, and a transformer connected between one end of each secondary coil of each transformer. a certain first discharge lamp; a second discharge lamp connected between each other end of each of the secondary coils; and between each end of the first discharge lamp and the same power supply line. A discharge lamp lighting device comprising a sequential lighting capacitor connected to each of the capacitors and having a series combined capacitance twice the capacitance required for sequential lighting.