JPH07153581A - Noise reducing device by lighting coil of discharge lamp - Google Patents

Abstract

PURPOSE:To reduce noise by a lighting coil at lighting time in a discharge lamp luminaire. CONSTITUTION:A lighting coil 2 to generate discharge starting voltage is connected between a discharge lamp 1 and in electric power supply device 3. A contactor 4 composed of a switch to bypass the lighting coil 2 is connected in parallel to the lighting coil 2, and the switch of the contactor 4 is opened at starting time, and after discharge is started, the switch of the contactor 4 is closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for reducing noise caused by a lighting coil when lighting a discharge lamp using a mercury lamp, a metal halide lamp, a high pressure sodium lamp or the like.

[0002]

2. Description of the Related Art In a discharge lamp luminaire, it is necessary to apply a voltage higher than a discharge starting voltage between both electrodes of the discharge lamp at the time of starting, so that a discharge starting voltage is generated between the discharge lamp and a power supply device. A lighting coil is connected to the lighting coil, and a predetermined voltage is induced in the lighting coil by the starting power source to superimpose it on the power supply voltage only at startup, so that a voltage higher than the discharge start voltage is applied between both electrodes of the discharge lamp I have to. However, since the lighting coil remains connected even after the start-up power is turned off after the start of discharge, the discharge current flows through this lighting coil, causing a considerable noise called a boon, which is annoying. It was

[0003]

DISCLOSURE OF THE INVENTION An object of the present invention is to improve the drawbacks of the above-mentioned conventional device, and in a discharge lamp lighting fixture, a discharge lamp capable of reducing noise caused by a lighting coil at the time of lighting. It is to provide a noise reduction device using the lighting coil.

[0004]

In order to achieve the above object, a noise reducing device using a lighting coil for a discharge lamp according to the present invention is a lighting device for generating a discharge starting voltage between a discharge lamp and a power supply device. In a discharge lamp lighting fixture with a lighting coil connected, connect a contactor consisting of a switch that bypasses the lighting coil in parallel with the lighting coil, open the contactor switch at startup, and switch the contactor switch after starting discharge. I'm trying to close.

[0005]

When starting, the contactor 4 is opened to operate the starting power supply, and the voltage of the power supply device and the voltage induced in the lighting coil are superimposed and applied between both terminals of the discharge lamp. After the discharge is started, the contactor 4 is closed, both terminals of the discharge lamp are directly connected to the power supply device, and the operation of the starting power supply is stopped so that no current flows in the lighting coil, so that noise is not generated.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described with reference to FIG. Both terminals of the discharge lamp 1 are connected to the power supply device 3 via the lighting coil 2, and the contactor 4 is connected between the power supply device 3 and both terminals of the discharge lamp 1.
The lighting coil 2 is composed of a primary coil 2c wound around an iron core and two secondary coils 2a and 2b.
a and 2b are connected between both terminals of the discharge lamp 1 and the power supply device 3. Further, the primary coil 2a is connected to a starting power source 5 which generates a voltage only when the discharge lamp 1 is started, so that the starting voltage is induced in the secondary coils 2a and 2b at the time of starting.

The contactor 4 comprises two normally-closed interlocking switches 4a and 4b and an electromagnetic mechanism 4c for operating them, and the two switches 4a and 4b are provided between both terminals of the discharge lamp 1 and the power supply device 3. (That is, the secondary coils 2a and 2b
And are each connected in parallel). Two switches 4
The magnets a and 4b are opened by exciting the electromagnetic mechanism 4c only when the discharge lamp 1 is started.

Next, the operation will be described. When the discharge lamp 1 is started, the electromagnetic mechanism 4c of the contactor 4 is excited to open the switches 4a and 4b, and the starting power source 5 is operated to induce a starting voltage in the secondary coils 2a and 2b. Then, the voltage of the power supply device 3 and the voltage induced in the secondary coils 2a and 2b are applied to both terminals of the discharge lamp 1 in a superimposed manner, whereby the discharge lamp 1 starts discharging. After the start of discharge, when the electromagnetic mechanism 4c is turned off, the switches 4a and 4b are closed, and both terminals of the discharge lamp 1 are directly connected to the power supply device 3, and the operation of the startup power supply 5 is stopped,
Since no current flows through the primary coil 2c and the secondary coils 2a, 2b, the noise called a boon generated at the time of startup is stopped.

In the above embodiment, the contactor 4
Although normally closed switches are used as the switches 4a and 4b, the switches are not limited thereto, and normally open switches may be used. In addition, if the operation of the electromagnetic mechanism 4c and the power source for activation 5 are performed in conjunction with each other, the operation becomes easier.

[0010]

As described above, the noise reducing device for the lighting coil of the discharge lamp according to the present invention is generated from the conventional lighting coil by making the contactor bypass the lighting coil after lighting. It has an effect that noise can be completely eliminated.

[Brief description of drawings]

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

[Explanation of symbols]

1 discharge lamp 2 lighting coil 3
Power supply 4 Contactor 5 Power supply for startup

Claims (1)

[Claims] 1. A discharge lamp luminaire comprising a lighting coil connected between a discharge lamp and a power supply device for generating a discharge starting voltage, wherein the lighting coil is bypassed in parallel with the lighting coil. A noise reduction device using a coil for lighting a discharge lamp, in which a contactor consisting of a switch is connected, the switch of the contactor is opened at the time of startup, and the switch of the contactor is closed after the start of discharge.