JP2000348878A - Incandescent bulb lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an incandescent bulb lighting device without shortening a contact life even a contact capacity for blinking the incandescent bulb is reduced. SOLUTION: In this device, a timer circuit 3 is placed in parallel in a relay 2 operated by operating a lighting switch 1 of an incandescent bulb 5 and a timer contact 4 delay-operated by the timer circuit 3 and the incandescent bulb 5 are serially connected to a power source 8. Then, a relay contact 6 and a feeble current carrying circuit 7 are disposed in the timer contact 4 in parallel. The feeble current carrying circuit 7 is operated by interlocking the lighting switch 1 and then the timer contact 4 is delay-operated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incandescent bulb lighting device for lighting an incandescent bulb.

[0002]

2. Description of the Related Art Conventionally, as a lighting device for lighting an incandescent bulb, there is no device that performs a special operation at the time of lighting, and an on / off operation is performed using a contact point such as a relay or a magnet contactor. FIG. 4 shows a lighting circuit (blinking circuit) using a relay, 8 is a power supply, 5 is an incandescent bulb, and the relay 14 is operated by the lighting switch 1 to turn on and off the incandescent bulb 5 by the relay contact 15. Was.

[0003]

In the case of an incandescent bulb, the filament resistance before lighting is small and the resistance value rises due to a rise in temperature after lighting, and the rated value is reached.
A rush current of 10 to 10 times flows. Therefore, using a relay with a contact capacity that matches the rated value of the incandescent bulb shortens the life of the contacts and requires frequent replacement of the contacts. There are many. That is, when the incandescent bulb of 100 watts is turned on and off, a contact capacity of 100 volts and 1 ampere may be used as long as the resistance value does not change, but a contact capacity of about 100 volts and 10 amperes is actually used. I was For this reason, relays and the like have become large, requiring a large installation space, and have become expensive.

Accordingly, an object of the present invention is to provide an incandescent bulb lighting device that does not shorten the contact life even if the contact capacity for turning on and off the incandescent bulb is reduced.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 has a timer circuit and a weak current supply circuit, and when the incandescent bulb is turned on, the timer circuit and The weak current supply circuit is activated, the weak current supply circuit continues to supply a weak current to the incandescent bulb until the timer circuit times out, and thereafter the power supply voltage is directly applied.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram of an incandescent ball lighting device according to the present invention. A timer circuit 3 is provided in parallel with a relay 2 operated by operating a lighting switch 1, and a timer contact 4 controlled by the timer circuit 3 is connected to an incandescent ball. 5, a relay contact 6 and a weak current supply circuit 7 are provided in series with the timer contact 4 in parallel. The timer circuit 3 starts counting by turning on the lighting switch 1 and turns on the timer contact 4 when a predetermined time has elapsed. The timer circuit 3 delays the timer contact 4 with respect to the lighting operation of the lighting switch 1. It has become.

FIG. 2 shows an example of the weak current supply circuit 7.
This is a circuit generally known as a dimming circuit, in which the triac 10 is operated by a trigger diode 11 to control the current, and the trigger cycle is determined by the time constant of CR.

The operation when the incandescent bulb is turned on will be described below. 1. The lighting switch 1 is turned on. 2. When the relay 2 is turned on, the weak current energizing circuit 7 operates, a current whose phase is controlled flows through the incandescent bulb 5, and the timer circuit 3 starts operating. 3. The filament of the incandescent bulb 5 is heated by this current, and the resistance value increases. 4. When the timer circuit 3 elapses a predetermined time, the timer contact 4 is turned on. 5. When the timer contact 4 is turned on, the operation of the weak current supply circuit 7 ends, and the voltage of the power supply 8 is applied to the incandescent bulb 5 as it is.

The operation of the weak current supply circuit 7 will be further described. As shown in the voltage waveform diagram of FIG. 3, a part of the voltage waveform is cut and output. Then, the current value can be suppressed to about 30%. Then, after the filament is heated by the current and the resistance value rises, the timer contact 4 performs a delay operation to apply the voltage of the entire waveform, that is, the power supply voltage. Therefore, it is possible to suppress the inrush current when the power supply voltage is applied as well as when the operation of the weak current supply circuit 7 starts. The operation delay time of the timer contact 4 by the timer circuit 3 is, for example, about 1 second, so that a good rush current suppressing effect can be obtained.

As described above, after the lighting switch is operated, a phase-controlled current is applied to heat the filament, so that the power supply voltage is prevented from being applied to one unit. The power supply voltage is applied after the voltage rises, the rush current can be suppressed, and the contact capacity of a relay or the like can be reduced.
The size can be reduced. In addition, the space for installing the contacts and the like can be saved, and the contacts can be made inexpensive. Note that the incandescent ball lighting device is not limited to the incandescent ball, and a load having resistance-temperature characteristics such as a tungsten filament can suppress an inrush current and can be used advantageously.

[0011]

As described above, according to the first aspect of the present invention, the inrush current can be suppressed, so that the contact capacity of a relay for turning on and off the incandescent bulb can be reduced. Therefore, the size of the relay can be reduced, the cost can be reduced, and the space can be reduced.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of an incandescent ball lighting device showing an example of an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of the weak current supply circuit of FIG.

FIG. 3 is an explanatory diagram of an output waveform of the weak current passing circuit of FIG. 2;

FIG. 4 is a circuit diagram showing a conventional incandescent ball lighting device.

[Explanation of symbols]

1. Lighting switch, 2 relay, 3 timer circuit, 4 timer contact, 5 incandescent bulb, 6 relay contact, 7, weak current supply circuit.

Claims (1)

[Claims] 1. A timer circuit and a weak current energizing circuit, wherein when the incandescent ball is turned on, the timer circuit and the weak current energizing circuit are activated, and the weak current energizing circuit is operated until the timer circuit times out. Characterized in that a weak current continues to flow through the incandescent bulb, and then the power supply voltage is directly applied.