JPH04306591A - Discharge lamp lighting device - Google Patents

Abstract

PURPOSE:To inform that the battery to supply power in the event of power interruption to an emergency lighting circuit is in normal operation and that a discharge lamp has launched in the final period of its lifetime by furnishing a circuit to sense the charging current for the battery and another circuit to sense the final life period of the discharge lamp. CONSTITUTION:When AC power supply 1 is interrupted, a relay 3 is deactuated with its normally closed contact 3b turned on, and a battery 12 operates an inverter circuit 13 for lighting up a fluorescent lamp 18. This lamp 18 is lighted by the power supply 1 when it operates normally, and the discharge current flows from a rectifier circuit 6 to the battery 12 through a diode 11, and a transistor 7 is turned on to actuate a light emitting diode 9. If the lamp 18 is in final life period when the power fails, the condition near no load is generated to cause large voltage generation in a winding 19, and a constant voltage diode 20 is turned on to light up a light emitting diode 15D, and a photo-transistor 15T receives light therefrom and is turned on, and the abovementioned light emitting diode 9 is actuated, which thus informs that the battery 12 is in normal operation and that the lamp 18 is in the final period of its lifetime.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device for a discharge lamp used, for example, as an emergency light or guide light.

0002

[Prior Art] For example, a discharge lamp lighting device used for emergency lights is equipped with a battery, and when there is no commercial AC power outage, the discharge lamp is lit via a ballast, and when the commercial AC power outage is interrupted, the discharge lamp is turned on by the battery. The lighting circuit operates to light the discharge lamp. In such a discharge lamp lighting device, the battery is charged during a non-interruption of the commercial AC power supply, and a display monitor indicates the state in which the battery is normally charged.

0003

[Problems to be Solved by the Invention] By the way, in this type of discharge lamp lighting device, when the discharge lamp reaches the end of its life, even if it is lit normally with normal lighting via a ballast, a power outage occurs and emergency use by battery is required. When switching to the lighting circuit, dimming starts, which may cause problems. For this reason, it is desirable to notify when a discharge lamp reaches the end of its life. However, the conventional device uses a display monitor to notify that the battery is being charged normally, but cannot detect and notify the end of the discharge lamp's life.

[0004] Accordingly, the present invention is an apparatus for lighting a discharge lamp by operating an emergency lighting circuit using a battery during a power outage, and is capable of informing that the battery is being charged normally and also when the discharge lamp is at the end of its life. The present invention aims to provide a discharge lamp lighting device which can notify the user of the current condition and which can share the notification means used for both devices.

[0005]

[Means for Solving the Problems] The present invention provides a commercial AC power source, a ballast connected to the power source via a check switch, an emergency lighting circuit connected to the power source via a check switch, and a ballast connected to the power source via a check switch. A switching means that connects the electric light, the discharge lamp during a power outage to a ballast, and the discharge lamp during a power outage to an emergency lighting circuit; The battery to be supplied, the charging current detection circuit that detects the charging current to this battery, the end-of-life detection circuit that detects the end of the discharge lamp's life, the charging current detection output of the charging current detection circuit, and the life of the end-of-life detection circuit. This device is provided with a notification means that performs a notification operation in response to either one of the terminal stage detection outputs.

[0006]

[Operation] In the present invention having such a structure, the discharge lamp is connected to the ballast and turned on when the commercial AC power supply is not interrupted. Further, the battery is charged, the state of charge is detected by the charging current detection circuit, and the notification means performs a notification operation. Further, when the commercial AC power supply fails, power is supplied from the battery to the emergency lighting circuit, and the discharge lamps connected to this emergency lighting circuit are lit.

Furthermore, if the discharge lamp is turned on by a commercial AC power supply via a ballast and the inspection switch is turned off to check the operation of the emergency lighting circuit, the situation will be the same as that at a power outage, and the battery will not work properly. The lighting circuit operates and the discharge lamp is lit. At this time, if the discharge lamp is at the end of its life,
It is detected by the end-of-life detection circuit, and the notification means operates to notify.

[0008]

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

In FIG. 1, reference numeral 1 denotes a commercial AC power source. A relay 3, a primary winding 4a of a power transformer 4, and a ballast 5 are connected to this AC power source 1 via a check switch 2, respectively.

An AC input terminal of a full-wave rectifying diode bridge circuit 6 is connected to the secondary winding 4b of the power transformer 4, and a PNP type transistor constituting a charging current detection circuit is connected to the rectifying output terminal of the diode bridge circuit 6. 7 and a resistor 8 are connected in series to a light emitting diode 9 as a notification means. Further, the diode bridge circuit 6
A battery 12 is connected to the rectified output terminal of the relay 3 through a resistor 10 and a diode 11 in the forward direction, and an inverter circuit 13 as an emergency lighting circuit is also connected through the normally closed contact 3b of the relay 3. A connection point between the resistor 10 and the anode of the diode 11 is connected to the base of the transistor 7 via a resistor 14. The light emitting diode 9 is also connected to the battery 12 via a phototransistor 15T of a photocoupler, a resistor 16, and the resistor 8 in series.

A switching contact 31 of the relay 3 constituting a switching means is connected to the output terminal of the ballast 5 and the output part of the inverter circuit 13 to the secondary winding of the transformer 17.
, 32, 33, 34, a discharge lamp, for example a fluorescent lamp 18, is connected. That is, one filament electrode 18a of the fluorescent lamp 18 is connected to the filament winding portion formed at one end of the output terminal of the ballast 5 via the normally open sides of the switching contacts 31 and 32, and the ballast The other filament electrode 18b of the fluorescent lamp 18 is connected to the filament winding portion formed at the other end of the output terminal of the lamp 5 via the normally open sides of the switching contacts 33 and 34. Further, one filament electrode 18a of the fluorescent lamp 18 is connected to the filament winding portion formed on one end side of the secondary winding of the transformer 17 via the normally closed side of the switching contacts 31 and 32. The other filament electrode 18b of the fluorescent lamp 18 is connected to the filament winding portion formed at the other end of the secondary winding of the transformer 17 via the normally closed sides of the switching contacts 33 and 34.

The transformer 17 also includes a fluorescent lamp 18.
A winding 19 is provided for detecting the end of life of the photocoupler, and a light emitting diode 15D of the photocoupler is connected to this winding 19 via a constant voltage diode 20 to form an end of life detection circuit. In an embodiment having such a configuration, the inspection switch 2 is normally in an on state.

[0013] Therefore, during non-power outage when the power supply 1 is on, the relay 3 operates, so its normally closed contact 3b
is off, and each switching contact 31 , 32 , 33 , 3
4, the normally open side is on.

[0014] In this manner, during a non-power outage, the fluorescent lamp 18 is connected to the power source 1 via the ballast 5 and is lit. Also, a resistor 1 is connected from the output terminal of the diode bridge circuit 6.
0, a charging current flows to the battery 12 via the diode 11, and the battery 12 is charged. When charging current is flowing through the battery 12, the transistor 7 turns on and the light emitting diode 9 lights up to notify the user.

[0015] If power supply 1 fails in this state, relay 3
, the normally closed contact 3b is turned on, and each switching contact 31 , 32 , 33 , 34 is turned on.
The normally closed side is switched on. As a result, the battery 12
is connected to an inverter circuit 13, and a fluorescent lamp 18 is connected to a secondary winding of a transformer 17 provided at the output section of the inverter circuit 13. In this way, the inverter circuit 13 starts an oscillating operation, high frequency power is generated in the secondary winding of the transformer 17, and the fluorescent lamp 18 is turned on. Further, in this state, no charging current flows to the battery 12, so the transistor 7 is turned off and the light emitting diode 9 is turned off.

If the fluorescent lamp 18 is at the end of its life during this power outage, a relatively large voltage will be generated in the winding 19 because it will be in a nearly no-load state. This voltage causes the constant voltage diode 20 to conduct, causing the light emitting diode 15D of the photocoupler to emit light. The phototransistor 15T receives this light and turns on.

[0017] As a result, the light emitting diode 9 is connected to the battery 12 and is turned on. In this way, if the fluorescent lamp 18 is at the end of its life during a power outage, the light emitting diode 9 can be turned on to notify the user.

[0018] This makes it possible to replace the fluorescent lamp 18 before it becomes malfunctioning. In addition, the fluorescent lamp 18
When the fluorescent lamp 18 reaches the end of its life, the lamp efficiency decreases and the input current increases, which may shorten the life of the battery 12. However, since the end of the life of the fluorescent lamp 18 is notified, it is recommended to replace the fluorescent lamp 18 early. This makes it possible to prevent the life of the battery 12 from decreasing.

Furthermore, if the inspection switch 2 is turned off during a non-power outage, the battery 12,
If the inverter circuit 13 and the fluorescent lamp 18 are normal, the fluorescent lamp 18 lights up. In this way, inspection can be carried out during non-power outages. Also, during this inspection, the fluorescent lamp 1
8 is normal, no large voltage is generated in the winding 19, so the constant voltage diode 20 is not conductive.

However, when the fluorescent lamp 18 is at the end of its life, a relatively large voltage is generated in the winding 19 because it is close to a no-load state. This voltage makes the constant voltage diode 20 conductive and the light emitting diode 1 of the photocoupler
5D emits light. The phototransistor 15T receives this light and turns on.

[0021] As a result, the light emitting diode 9 is connected to the battery 12 and is turned on. In this way, when the inspection switch 2 is turned off, if the fluorescent lamp 18 is at the end of its life, the light emitting diode 9 lights up to notify the user. Therefore, the same effect as during a power outage can be obtained during inspection.

In this way, the light emitting diode 9 is connected to the battery 1.
It can be used not only as a monitor to notify that the fluorescent lamp 2 is being charged, but also as a monitor to notify the end of the life of the fluorescent lamp 18 during a power outage or when the inspection switch 2 is turned off. Therefore, only one light emitting diode is required.

[0023] In the above embodiment, a light emitting diode was used as the notification means, but the invention is not necessarily limited to this, and other display elements or devices that generate sound may be used as the case may be. .

[0024]

[Effects of the Invention] As detailed above, according to the present invention, in a device that operates an emergency lighting circuit using a battery during a power outage to light a discharge lamp, it is possible to notify that the battery is being normally charged. It is therefore possible to provide a discharge lamp lighting device which can notify the user that the discharge lamp has reached the end of its life, and which can also use notification means for both devices.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

[Explanation of symbols]

1...Commercial AC power supply, 2...Inspection switch, 3...Relay, 3
1 to 34... Relay switching contact, 5... Ballast, 7... P
NP type transistor, 9...Light emitting diode (notification means)
, 12... Battery, 13... Inverter circuit, 15T... Phototransistor of photocoupler, 15D... Light emitting diode of photocoupler, 17... Transformer, 18... Fluorescent lamp, 20... Constant voltage diode.

Claims (1)

[Claims] 1. A commercial AC power source, a ballast connected to the power source via a check switch, an emergency lighting circuit connected to the power source via a check switch, and a discharge lamp.
switching means that connects the discharge lamp to the ballast when the power source is not out of power and connects the discharge lamp to an emergency lighting circuit when the power source is out of power; a charging current detection circuit that detects the charging current to the battery; an end-of-life detection circuit that detects the end of the life of the discharge lamp; a charging current detection output of the charging current detection circuit; A discharge lamp lighting device characterized by being provided with a notification means that performs a notification operation in response to one of the end-of-life detection outputs of the end-of-life detection circuit.