JPS5820480B2 - Houdentunotentouchouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting device for a discharge lamp, and is suitable for guide light fixtures installed in movie theaters, hotel lobbies, and the like.

Originally, guide light equipment had its built-in discharge lamp turned on at all times (10
By turning on the guide light sign board j (0% lighting), the brightness of the guide light sign board j is increased, allowing passersby or those in the room to recognize the guide light sign board, and informing them of the exit in case of an emergency.

However, if the brightness of the guide light sign boards installed in movie theaters, hotel lobbies, etc. is high, it will interfere with movie viewing and spoil the atmosphere.In such cases, it is necessary to lower the brightness of the guide light sign boards. be.

However, in the event of an emergency, it is necessary to increase the brightness of the guide light sign board so that passersby or occupants can recognize the guide light sign board.

The present invention was invented focusing on this point, and since
An embodiment of the present invention will be described based on the drawings.

A discharge lamp 1 is connected in series to a ballast 2 to form a normal discharge lamp lighting circuit, and this circuit is connected to a dimming choke coil 3.
, 4 to an AC power supply terminal 5.6.

A starting device 10 consisting of a glow prize 8 and a noise-proof IE capacitor 9 is provided between the filaments 7 and 7 on the non-power supply side of the discharge lamp 1.

The starting device 10 may be one using a conventionally known semiconductor circuit mainly composed of silicon symmetrical switching elements, for example.

11 is a capacitor, one end of which is a choke coil 3,
The capacitor 11 and the choke coil 4 form a series resonant circuit.

Reference numeral 13 is a relay that opens and closes the short-circuit switch 14 of the choke coils 3 and 4, and is connected to the starting device 1 via the operating switch 15.
0 in parallel.

This operation switch 15 is linked to a fire detector, for example,
It is designed to open when a fire is detected.

Further, an emergency lighting device 16 is provided that lights the discharge lamp 1 in the event of a power outage.

That is, the device 16 has an inverter 18 that uses a secondary battery 17 as a power source, and the output end of the inverter 18 is connected to the discharge lamp 1 via a capacitor 19 that blocks low frequencies of the AC power source and passes high frequencies from the inverter 18. filament 7゜7
The input end of the inverter 18 is connected to the secondary battery 17 via a relay switch 20.

This secondary battery 17 is connected to AC power supply terminals 22 and 22 via a charging circuit 21, and a relay 23 is connected between the terminals 22 and 22 to keep the relay switch 20 open at all times.

Next, the operation will be explained.

When AC power is applied to the AC power terminals 5 and 6, the glow tube 8 glow discharges via the short-circuit switch 14, and the glow tube 8 is short-circuited by the activation of the pi-metal of the glow tube 8, and the filament is discharged via the short-circuit switch 14. A preheating current flows,
When the filament 7.7 is sufficiently preheated, the discharge lamp 1 is lit by the kick voltage generated in the ballast 2 upon return contact and separation of the bimetal.

In this case, the discharge lamp 1 is in a fully lit state due to the closing of the short-circuit switch 14.

After the discharge lamp 1 is lit, the tube voltage of the discharge lamp 1 is applied to the glow tube 8, but the glow tube 8 does not operate.

On the other hand, since the constant operation switch 15 is closed and the relay 13 is activated by this tube voltage, the short circuit switch 14
is opened, and the discharge lamp 1 shifts to dimming (dimming) lighting by the choke coils 3 and 4.

Further, at this time, the potential of the connection point 12 is raised by the series resonant circuit of the capacitor 11 and the choke coil 4, and the lighting maintenance current of the discharge lamp 10 is maintained, so that the discharge lamp 1 is dimmed and lit stably.

When the operation switch 15 is opened due to activation of the fire detector, the relay 13 is no longer energized and the short-circuit switch 14 is closed, so that the choke coil 3. .

4 is short-circuited, and the discharge lamp 1 becomes fully lit.

Also, if the fire gets worse and there is a power outage, the power outage detection relay 2
3 is de-energized, the inverter 18 is activated by closing the relay switch 20, and the discharge lamp 1 is lit at high frequency.

In the following explanation, the case where the operation switch 15 responds to the activation of the fire detector has been explained, but the emergency lighting device 16
If it is removed and the operation switch 15 is manually switched, it can be used as a discharge lamp dimming device for general lighting equipment.

In the above embodiment, one end of the capacitor 11 is connected to the intermediate connection point 12! lc connection, but instead of this point 12, it may be connected to an intermediate connection point 24 between the choke coil 3 and the ballast 2.

As described above, according to the present invention, the series circuit of the operating switch and the operating device for opening and closing the short-circuit switch of the dimming series reactance element inserted in the discharge lamp lighting circuit is connected in parallel with the discharge lamp starting device. , the discharge lamp can be started with full light lighting based on the fluctuation of the voltage across the starting device at the time of starting the discharge lamp, and then can be automatically dimmed, and can be turned on with full light by opening the operation switch. Therefore, a dimming lighting device can be obtained with a simple configuration.

[Brief explanation of the drawing]

The drawing is an electric circuit diagram of a lighting device for a discharge lamp showing an embodiment of the present invention. 3.4...Series reactance element, 1...Discharge lamp,
DESCRIPTION OF SYMBOLS 11... Parallel reactance element, 10... Starting device, 14... Short circuit switch, 13... Actuating device, 15
...Operation switch.

Claims (1)

[Claims] 1 A series resonant circuit is formed by a dimming series reactance element inserted in the discharge lamp circuit and a parallel reactance element connected in parallel to the discharge lamp, and the series reactance element is connected in parallel with the starting device between the discharge lamp filaments. A series circuit of an operating device and an operating switch is provided for opening and closing the shorting switch of the element, and when the operating switch is closed when starting the discharge lamp, the shorting switch is temporarily closed, and the discharge lamp is fully lit. 1. A lighting device for a discharge lamp, characterized in that a series reactance element and a series resonant circuit are used to shift to dimming lighting.