JPS6041673Y2 - lighting circuit - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a lighting circuit.

As shown in FIG. 1, the conventional emergency light lighting circuit normally excites a power failure detection relay 2 using a commercial power source 1 to switch the relay contact 2a to the No side, and also turns on the transformer 3, rectifier 4, and charging resistor 5. During a power outage of the commercial power source 1 and when the inspection switch 7 is opened, the excitation of the power failure detection relay 2 is stopped, the relay contact 2a is switched to the NC side, and the incandescent lamp 8 is turned on in an emergency by the storage battery 6. He was arranging something like this.

Such a conventional emergency light lighting circuit is required to have the ability to reliably turn on the incandescent lamp 8 in an emergency, but since the incandescent lamp 8 is always off, this circuit does not prevent filament breakage of the incandescent lamp 8. Even if there is a malfunction such as disconnection, loosening, or defective socket, it is very difficult to detect the malfunction, and there is a possibility that the incandescent lamp 8 will not turn on in an emergency.

In addition, similar problems occur in ordinary lighting circuits, such as lamp filament breakage, disconnection, loosening, and defective sockets, and these problems cannot be discovered until the lighting switch is turned on.

Therefore, an object of this invention is to provide a lighting circuit that can automatically notify malfunctions such as broken filament, disconnection, loosening of the lamp filament, and defective socket when the lamp is turned off.

An outline of this invention will be explained based on FIG. 2.

That is, this lighting circuit is configured so that power can be supplied from the power supply 9 to the lamp 11 via the switch 10, and is provided with a power supply path 12 that allows a minute current to flow from the power supply 9 to the lamp 11 when the switch 10 is opened. The flowing current value is detected at a plurality of different levels by the current change detection section 13, the switches 14A to 14N are respectively closed by a plurality of corresponding outputs, and the notification sections 15A to 15N corresponding to these switches 14A to 14N are activated. make it work,
Depending on the type of failure of the lamp 11, etc. (filament breakage, lamp disconnection; poor socket connection, poor contact between the socket and lamp, filament wear), the notification unit 15A~
It is designed to operate different types of 15N.

Note that the minute current may be made to flow through the lamp 11 intermittently.

Hereinafter, specific examples will be described based on the drawings.

A first embodiment of this invention is shown in FIG.

In other words, this emergency light lighting circuit consists of the transformer 3 in Fig. 1.
By connecting a series circuit (power supply path) of a diode 16 and a resistor 17 between one end of the secondary winding and the NO terminal of the relay contact 2a, the diode 16 and A small current is passed through the incandescent lamp 8 through the resistor 17, and the first
A series circuit of a Zener diode 18A (current change detection section, switch) having a Zener voltage of
B (current change detection section, switch), a resistor 19B, and a series circuit of a light emitting diode 20B (notification section) are connected in parallel, and the other configuration is the same as that in FIG.

In this emergency light lighting circuit, when the incandescent lamp 8 and the socket etc. are normal, the impedance of the incandescent lamp 8 etc. is low and the voltage across the incandescent lamp 8 is low (VO), so the Zener diodes 18A and 18B are both cut off. When the light-emitting diodes 20A and 20B go out, and a lighting failure occurs such as a poor contact between the incandescent lamp 8 and the socket or a poor connection of the socket, the impedance of the incandescent lamp 8, etc. increases, and the voltage across the incandescent lamp 8 increases. (
V, :Vl〉V.

), the Zener diode 18A becomes conductive, the light emitting diode 20A lights up, the filament of the incandescent lamp 8 is disconnected,
When a malfunction such as disconnection occurs, the impedance of the incandescent lamp 8 etc. becomes infinite, the voltage across the incandescent lamp 8 becomes even higher (V2; "2>Vl"), and both Zener diodes 18A and 18B become conductive. Both light emitting diodes 20A and 20B are turned on.

As a result of this configuration, even when the incandescent lamp 8 is off, lighting failures such as poor contact between the incandescent lamp 8 and the socket or poor socket connection, and malfunctions such as the filament of the incandescent lamp 8 breaking or coming off, are prevented. It is possible to distinguish and automatically notify, preventing malfunctions during power outages, and since it is possible to determine the nature of the failure, it is possible to quickly respond to the failure.

Further, since the incandescent lamp 8 is always energized to preheat the filament, even when the incandescent lamp 8 is turned on during a power outage, the rush current at the initial stage of lighting can be reduced, and the possibility of filament breakage can be reduced.

Furthermore, if this invention is applied to a non-contact type emergency light lighting circuit, the collector loss of the switch transistor can be reduced by reducing rush TIFE, and the circuit can be constructed at low cost.

A second embodiment of this invention is shown in FIG.

That is, in this emergency light lighting circuit, when the commercial power supply 21 is normal, the power transformer 22 and the bridge rectifier 2
The storage battery 25 is charged via the power supply line A2.3 and the charging resistor 24, and the power supply line A2. The voltage across A3 excites the power failure detection relay 26 and connects the relu contacts 26a, 26b, 26c.
Turn to the No side, and connect the commercial power supply 21 → switch 27 → feed line A□ → single coil 28 → relay contact 26a → fluorescent lamp 29 → relay contact 26b → parallel circuit of glow starter 30 and noise prevention capacitor 31 → fluorescent lamp 29
→ Inspection switch 32 → Power supply line → Start the fluorescent lamp 29 along the route of commercial power supply 21, and turn on the commercial power supply 21 → switch 27.
→Power line A1 → Single coil 28 → Relay contact 26a
→ Fluorescent lamp 29 → Inspection switch 32 → Power supply line → Commercial power supply 21 to turn on the fluorescent lamp 29 normally.

On the other hand, when the commercial power supply 21 has a power outage, charging of the storage battery 25 is stopped, and the excitation of the power outage detection relay 26 is also stopped, causing the relay contacts 26a, 26b, and 26c to fall to the NC side. Power is supplied to the inverter 33, and the transistor inverter 33 starts high-frequency oscillation, and this high-frequency oscillation output lights up the fluorescent lamp 29 in an emergency through the relay contacts 26a and 26b.

In this case, the transistor inverter 33 includes a transistor 33A, an oscillation transformer 33B, resistors 33C and 33D, and capacitors 33E and 33F.

Then, by opening and closing the switch 27, the fluorescent lamp 29 is
When the light is turned off, the commercial power supply 21-
Power supply line A3 - current change detection section 34 → single coil 28
→ Relay contact 26a → Filament 2 of fluorescent lamp 29
9a → Relay contact 26b → Noise prevention capacitor 31 → Fluorescent lamp 29 filament 29b → Inspection switch 32
→ A small current flows in the path of feeder line A2 → commercial power supply 21,
When a failure such as filament breakage occurs in the fluorescent lamp 29 and the value of the current flowing through the path changes, the current change detection section 34 detects this at a plurality of different levels and activates the notification section 35 having a plurality of display elements. The system uses different display elements to distinguish and notify different types of failures.

For example, a short circuit in the glow starter 30, a short circuit in the noise prevention capacitor 31, a poor contact between the relay contacts 26a and 26b, thinning of the filaments 29a and 29b, and thinning of the filament 2
Disconnection of wires 9a and 29b, poor contact between the fluorescent lamp 29 and the socket, poor connection of the socket, etc. are distinguished and reported.

The effects of this embodiment are similar to those of the first embodiment.

Note that this idea can also be applied to ordinary lighting circuits.

As described above, the lighting circuit of this invention includes a power source, a lamp supplied with power from the power source, a switch interposed between the power source and the lamp, and a minute current flowing from the power source to the lamp during the opening period of the switch. , a current change detection unit that detects the current value flowing through the lamp at a plurality of different levels, and a plurality of notification units that respond to the output of the current change detection unit, so that when the lamp is turned off, It is possible to distinguish and automatically notify malfunctions such as broken, dislodged, loose lamp filaments, and faulty sockets, and also to determine the nature of the malfunction, so that malfunctions can be dealt with quickly.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of a conventional emergency light lighting circuit, Fig. 2 is a circuit diagram showing an outline of this invention, Fig. 3 is a circuit diagram of an emergency light lighting circuit of the first embodiment of this invention, and Fig. 4 is a circuit diagram of a conventional emergency light lighting circuit. The figure is a circuit diagram of an emergency light lighting circuit according to a second embodiment of this invention. 1... Commercial power supply, 2... Power failure detection relay 2a... Relay contact, 3... Transformer, 4... Rectifier, 5... ...Charging resistor, 6...Storage battery, 8...Incandescent lamp,
16...Diode, 17...Resistor (
Power supply line), 18A, 18B... Zener diode (current change detection section), 20A, 20B...
Light emitting diode (notification part).

Claims (2)

[Scope of utility model registration request] (1) A power source, a lamp powered by this power source,
a switch interposed between the power source and the lamp; a power supply line that allows a small amount of current to flow from the power source to the lamp during an open period of the switch; and a current change detection unit that detects a current value flowing through the lamp at a plurality of different levels. and a plurality of notification sections that respond to the output of the current change detection section. (2) The power source is an emergency storage battery that is constantly charged by a commercial power source, and the switch is a power outage detection switch that is normally open and closed when the commercial power source is out of service. ) Lighting circuit described in section.