JPH0629094A - Emergency light lighting device - Google Patents

Abstract

PURPOSE:To provide an emergency lamp lighting device, which does not impose a great burden on a switching circuit and which can prevent generation of a beam of light without increasing the cost to a great extent. CONSTITUTION:When the commercial AC main E is in non-power failure condition, a switching circuit 3 is changed over to a stabilizer 1, and the power from the AC main E is supplied to a discharge lamp FL via the stabilizer 1 to light it up. When the commercial main E is in power failure condition, the switching circuit 3 is changed over to an emergency lighting circuit 2, and the DC power of a battery B is converted by an inverter circuit 5 into high frequency AC to light up the discharge lamp FL. While the discharge lamp FL is lighted, DC is supplied thereto by a diode D1 and resistor R1 of a striation preventive circuit 6 to prevent generation of an apparent beam of light. Because the switching circuit 3 receives only impression of a voltage of an inverter transformer Tr2 and capacitor C1 and not any doubler voltage, the contact is precluded from shortening of the lifetime.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency light lighting device for preventing striation without burdening a switching circuit.

[0002]

2. Description of the Related Art Conventionally, as an emergency lighting device of this type, as shown in FIG. 2, for example, a switch of a switching circuit 3 of an emergency lighting circuit 2 is connected to a commercial AC power source E via a ballast 1.
Connect to 3a, 3b, 3c, 3d, switch 3 of this switching circuit 3
Discharge lamp FL filaments FL1, FL2 on a, 3b, 3c, 3d
Are connected.

A battery B is connected to the commercial AC power source E via a charging circuit 4 of the emergency lighting circuit 2.
An inverter circuit 5 for converting direct current into alternating current is connected to the battery B. In the inverter circuit 5, the primary winding Tr1 of the inverter transformer Tr is connected to the battery B side, and the secondary winding Tr2 of the inverter transformer Tr is connected to the switching circuit 3 via the capacitor C1 serving as a current limiting element. It is connected to the switches 3b and 3c. Similarly, the filament windings Tr3 and Tr4 of the inverter transformer Tr are also
It is connected to the switches 3a, 3b, 3c, 3d of the switching circuit 3.

When the commercial AC power source E is in the non-power failure state, the switching circuit 3 is switched to the ballast 1 side, and the power of the commercial AC power source E is supplied to the discharge lamp FL via the ballast 1 and the switching circuit 3. The battery B is supplied to light the discharge lamp FL, and the charging circuit 4 charges the battery B.

When the commercial AC power source E is in a power failure state, the switching circuit 3 is switched to the emergency lighting circuit 2 side, the DC power of the battery B is converted into a high frequency AC by the inverter circuit 5, and the discharge lamp FL is turned on. Turn on the light.

On the other hand, a structure described in Japanese Patent Application Laid-Open No. 3-25918 is known as a circuit for preventing the generation of striations, that is, striations in a discharge lamp. The striation prevention circuit described in Japanese Patent Laid-Open No. 3-25918 is a circuit in which a series circuit of a resistor and a diode is connected to a discharge lamp to supply a direct current to the discharge lamp.

When a series circuit of the resistor R1 and the diode D1 which becomes the striation prevention circuit 6 is connected in series to the discharge lamp in the circuit shown in FIG.
The configuration shown in can be considered.

In the configuration shown in FIG. 3, a series circuit of a diode D1 and a resistor R1 is connected in parallel with the secondary winding Tr2 and the capacitor C1 of the inverter transformer Tr shown in FIG. An electric current is supplied to apparently prevent the generation of striations.

[0009]

However, in the case of the circuit shown in FIG. 3 described above, when a negative voltage is induced in the secondary winding Tr2 of the inverter transformer Tr, the voltage V ₂ is charged in the capacitor C1. in the next positive half wave, constitute a half-wave voltage doubler circuit is discharged the voltage V ₂ charged in the capacitor C1 in addition to the voltage V _2, the switching circuit 3, 2 times the voltage of the normal Is applied, there are problems that an arc is generated between the contacts of the switches 3b and 3c, the contacts are burned, and the life of the contacts is shortened.

Further, if only the striation prevention circuit 6 is connected to the inverter transformer Tr, when the discharge lamp FL is turned on by the output from the ballast 1, striations are generated, so that on the ballast 1 side. However, it is necessary to add a striation prevention circuit, which has a problem of increasing cost.

The present invention has been made in view of the above problems, and an emergency light lighting device capable of preventing the generation of striations without adding a large load to the switching circuit and significantly increasing the cost. The purpose is to provide.

[0012]

SUMMARY OF THE INVENTION The present invention provides a commercial AC power supply for supplying power from the commercial AC power supply to turn on a lamp and charging a battery when the commercial AC power supply is not in operation. In the event of a power failure, the switching circuit supplies electric power from the battery to an emergency lighting circuit having an inductance element and a capacitance element,
In the emergency light lighting device for lighting the lamp with this emergency lighting circuit, between the switching circuit and the lamp,
A striation prevention circuit composed of a rectifying element and a resistor is connected.

[0013]

In the present invention, since the striation prevention circuit composed of the rectifying element and the resistor is connected between the switching circuit and the lamp, the half-wave voltage doubler is achieved by the inductance element and the capacitance element of the emergency lighting circuit and the rectifying element and the resistor. Even if the circuit is configured, the switching circuit will not be doubled, so the switching circuit will not be damaged.Because the striation prevention circuit is connected between the switching circuit and the lamp, there will be a power failure or non-power failure of the commercial AC power supply. Regardless 1
Since two striation prevention circuits work, there is no significant increase in cost.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an emergency light lighting device of the present invention will be described below with reference to the drawings. The parts corresponding to those of the conventional example shown in FIG.

As shown in FIG. 1, the switch of the switching circuit 3 of the emergency lighting circuit 2 is connected to the commercial AC power source E via the ballast 1.
Connect to 3a, 3b, 3c, 3d, switch 3 of this switching circuit 3
Discharge lamp FL filaments FL1, FL2 on a, 3b, 3c, 3d
Are connected.

A battery B is connected to the commercial AC power source E via a charging circuit 4 of the emergency lighting circuit 2.
An inverter circuit 5 for converting direct current into alternating current is connected to the battery B. In the inverter circuit 5, the primary winding Tr1 of the inverter transformer Tr is connected to the battery B side, and the secondary winding Tr2 as an inductance element of the inverter transformer Tr is a capacitor as a capacitance element serving as a current limiting element. It is connected to the switches 3b and 3c of the switching circuit 3 via C1. Similarly, the filament windings Tr3 and Tr4 of the inverter transformer Tr are also connected to the switches 3a, 3b, 3c and 3d of the switching circuit 3.

Further, a series circuit of a diode D1 as a rectifying element and a resistor R1 is connected between the filaments FL1 and FL2 between the switching circuit 3 and the discharge lamp FL to supply a direct current to the discharge lamp FL. Prevents the generation of striations called Kakegami Striation.

Next, the operation of the embodiment shown in FIG. 1 will be described.

First, when the commercial AC power source E is in a non-power failure state, the switching circuit 3 is switched to the ballast 1 side, and the power of the commercial AC power source E is supplied to the discharge lamp FL via the ballast 1 and the switching circuit 3. The battery B is supplied to light the discharge lamp FL, and the charging circuit 4 charges the battery B. Then, when the discharge lamp FL is on, direct current is supplied to the discharge lamp FL by the diode D1 and the resistor R1 of the striation prevention circuit 6 to prevent the appearance of apparent striations.

When the commercial AC power source E is in a power failure state, a power failure detection circuit (not shown) detects a power failure of the commercial AC power source E, switches the switching circuit 3 to the emergency lighting circuit 2 side, and the DC power of the battery B is detected. Is converted into high frequency AC by the inverter circuit 5 and the discharge lamp FL is lit. And
In this case as well, when the discharge lamp FL is lit, a direct current is supplied to the discharge lamp FL by the diode D1 and the resistor R1 of the striation prevention circuit 6 to prevent the appearance of apparent striations. To prevent.

According to the above embodiment, the inverter transformer
When a negative voltage is induced in the secondary winding Tr2 of the Tr, the capacitor C1 is charged with the voltage V ₂ , and in the next positive half-wave, the voltage V ₂ is charged with the voltage V ₂ in addition to the voltage V _{2. Even if 2} is discharged to form a half-wave voltage doubler circuit, the voltage of the inverter transformer Tr and the capacitor C1 is only applied to the switching circuit 3, and the voltage doubler is not applied. Since an arc is not generated between the contacts 3 and 3c and the contacts are not burnt out, it is possible to prevent the life of the contacts from being shortened.

Further, by connecting the striation prevention circuit 6 between the switching circuit 3 and the discharge lamp FL,
When the discharge lamp FL is turned on by the output from the ballast 1 and the discharge lamp FL is turned on by the output from the emergency lighting circuit 2 in one striation prevention circuit 6, the generation of the striations is prevented. Since this can be prevented, the generation of striations can be prevented without significantly increasing the cost.

[0023]

According to the emergency lamp lighting device of the present invention, since the striation prevention circuit composed of the rectifying element and the resistor is connected between the switching circuit and the lamp, the inductance element and the capacitance element of the emergency lighting circuit, and the rectifying element. Even if a half-wave voltage doubler circuit is configured with the resistor and the resistor, the voltage doubler is not applied to the switching circuit, so the switching circuit is not damaged and the life is extended, and there is a striation between the switching circuit and the lamp. Since the prevention circuit is connected, one striation prevention circuit operates regardless of the power failure or non-power failure of the commercial AC power source, and thus a large increase in cost can be prevented.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of an emergency light lighting device of the present invention.

FIG. 2 is a circuit diagram showing a conventional emergency light lighting device.

FIG. 3 is a circuit diagram of an emergency light lighting device having the same striation prevention circuit.

[Explanation of symbols]

 2 Emergency lighting circuit 6 Striation prevention circuit B Battery C1 Capacitor as capacitance element D1 Diode as rectifying element E Commercial AC power supply FL Discharge lamp R1 Resistor Tr2 Secondary winding as inductance element

Claims (1)

[Claims] 1. When the commercial AC power supply is not interrupted, power is supplied from the commercial AC power supply to turn on a lamp and a battery is charged by the commercial AC power supply, and when the commercial AC power supply is interrupted, the battery is switched by a switching circuit. In the emergency light lighting device for supplying the power from the electric power source to an emergency lighting circuit having an inductance element and a capacitance element, and lighting the lamp in the emergency lighting circuit, a rectifying element and a resistor are provided between the switching circuit and the lamp. An emergency light lighting device characterized by connecting a striation prevention circuit.