JPH0513189A - Power source for discharge lamp - Google Patents

Abstract

PURPOSE:To realize instantaneous re-lighting, stable instantaneous lighting and light dimming by connecting switching elements respectively in parallel to a bypass and sub choke coils connected in series to a pulse choke coil, so as to regulate the elements. CONSTITUTION:Upon turning-on of TRIACc 26, 28, a current flows in the TRIACs 26, 28 and a pulse choke coil 20 so that a discharge lamp 12 is lighted at electric power larger than a rated value, for instantaneous stable lighting and instantaneous re-lighting. When the TRIAC 28 is turned off with the TRIAC 26 turned on, the current flows in the TRIAC 26, a sub choke coil 24 and the pulse choke coil 20 so that rated lamp electric power is supplied to the discharge lamp 12. Furthermore, when the TRIAC 26 is phase-controlled with the TRIAC 28 turned off, a quantity of the current flowing in a bypass choke coil 22 is regulated, thereby dimming light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp power supply device, and more particularly, to an improvement of a discharge lamp power supply device capable of performing re-flashing and dimming.

[0002]

2. Description of the Related Art For example, ultraviolet rays are used for curing a resin, and a metal vapor high pressure discharge lamp is used as a light source of the ultraviolet rays. As a power supply device for this metal vapor high pressure discharge lamp,
Some include a choke coil connected in series with a discharge lamp and a capacitor connected in parallel with the discharge lamp, and perform lighting by pulse oscillation thereof.

[0003]

However, in such a conventional power supply device, there is a limit in increasing the secondary current at the time of the secondary short circuit and shortening the time required for stable lighting. Therefore, it has been difficult to provide a power supply device that satisfies the three requirements of re-flashing, instantaneous stable lighting, and dimming. Especially when using a discharge lamp for resin curing as described above, instantaneous stable lighting and dimming are indispensable in order to adjust the amount of ultraviolet rays and shorten the curing time. In such cases, it is necessary to temporarily turn off the discharge lamp and perform another blink. Therefore, from the past, re-flashing, instant stable lighting,
There has been a strong demand for a discharge lamp power supply device that meets the three requirements for dimming.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a discharge lamp power supply device capable of performing re-flashing, instantaneous stable lighting, and dimming.

[0005]

In order to achieve the above object, a discharge lamp power supply device according to the present invention comprises a capacitor connected in parallel with the discharge lamp, a pulse choke coil connected in series with the discharge lamp. A bypass choke coil and a sub choke coil connected in series with the pulse choke, a dimming switching element connected in parallel with the bypass choke coil, and a starting switching element connected in parallel with the sub choke coil. And are included.

[0006]

In the discharge lamp power supply device according to the present invention, first, the dimming switching element and the starting switching element are turned on at the time of lighting, and are connected in parallel to the respective coils without passing through the bypass choke coil and the sub choke coil. A current is caused to flow through the switching element, and only the pulse choke coil is used to start and light the discharge lamp at a power higher than the rated value. Therefore, instantaneous stable lighting and re-flashing are possible. After that, the switching element for starting is turned off.
When the F operation is performed, a current flows through the dimming switching element, the bypass choke coil, and the pulse choke coil to light the discharge lamp at the rated power. Further, when the dimming switching element is operated to cause a predetermined current to flow through the sub choke coil, the current flows through the sub choke coil, the bypass choke coil and the pulse choke coil, and the discharge lamp can be dimmed and lit. ..

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a circuit configuration of a discharge lamp power supply device according to the present invention. In the figure, a metal vapor high pressure discharge lamp 12 is connected to an AC power supply 10. Then, capacitors 14 and 16 are connected in parallel to the discharge lamp 12, and a discharge resistor 18 is connected in parallel to the capacitor 14.

A feature of the present invention is that a bypass choke coil and a sub choke coil are provided and a switching element is connected in parallel to each coil. Therefore, in the present embodiment, the bypass choke coil 22 and the sub choke coil 24 are further connected in series to the pulse choke coil 20 connected in series to the discharge lamp 12, and the dimming switching is performed in parallel with the bypass choke coil 22. That is, a triac 26 as an element and a triac 28 as a switching element for starting are provided in parallel with the sub choke coil 24.

The discharge lamp power supply device according to this embodiment is configured as described above, and its operation will be described below. First, when lighting the discharge lamp 12, the triac 26
Both the triacs 28 are turned on. Then, the current is higher than the rated value through the triacs 26 and 28 and the pulse choke coil 20, for example, 1.5.
The discharge lamp is turned on with about twice the power, and the lamp is instantly turned on stably and re-flashed.

Next, when the triac 28 is turned off while the triac 26 is turned on, current flows through the triac 26, the sub choke coil 24, and the pulse choke coil 28, and the rated lamp power is supplied to the discharge lamp 12.

Further, when the phase of the triac 26 is controlled with the triac 28 turned off, the amount of current flowing through the bypass choke coil 22 is adjusted, and dimming is performed, for example, between 0.5 and 0.75 times the rated power. Be done.

As described above, according to the discharge lamp power supply device of the present invention, it is possible to perform re-flashing, instant stable lighting, and dimming with a simple structure. As a result, when the discharge lamp power supply device according to the present embodiment is used for ultraviolet curing of resin, the ultraviolet curing can be adjusted by setting the rated lighting time and the dimming lighting time, and the rise of the ultraviolet radiation amount becomes faster. Therefore, it becomes possible to shorten the curing time of the resin and perform uniform curing.

[0013]

As described above, according to the discharge lamp power supply device of the present invention, the bypass choke coil and the sub choke coil are connected in series with the pulse choke coil, and the bypass choke coil and the sub choke coil respectively have switching elements. Since it was connected in parallel, by adjusting the switching element, re-flashing, instant stable lighting,
Dimming can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a circuit configuration of a discharge lamp starting device according to an embodiment of the present invention.

[Explanation of symbols]

 12 discharge lamp 20 pulse choke coil 22 bypass choke coil 24 sub choke coil 26 triac (dimming switching element) 28 triac (starting switching element)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ishikawa Definition 212-10 Akagidai, Kawasato-mura, Kita-Saitama-gun, Saitama Prefecture Eye Lighting System Saitama Manufacturing Co., Ltd.

Claims (1)

Claim: What is claimed is: 1. A capacitor connected in parallel with a discharge lamp, a pulse choke coil connected in series with the discharge lamp, a bypass choke coil and a sub-choke connected in series with the pulse choke. A discharge lamp power supply device comprising: a coil; a dimming switching element connected in parallel with the bypass choke coil; and a starting switching element connected in parallel with the sub choke coil.