JPS60202698A - Device for dimming discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a discharge lamp dimming device that keeps the filament preheating power of a discharge lamp constant regardless of the degree of dimming.

(Background of the Invention) As shown in FIG. 1, a conventional discharge lamp dimmer device includes an AC power source 1, a phase controller 2 that generates a phase-controlled output from the AC power source 1, and this phase controller. A lighting circuit 4 that lights a discharge lamp (lamp) 3 by means of an output point 2, and a filament l-1 lance 5 that supplies the output of the phase controller 2 to the filament of the lamp 3 are known. .

When the lamp 3, the lighting circuit 4, and the filament transformer 5 are assembled as a lighting device, such a discharge pair dimmer device consists of a phase controller 2 and is usually placed near a wall between two dimmer control panels. It can be connected to wiring.

By the way, in such a discharge lamp dimmer, when the dimming is turned down deeply, the filament preheating power is also reduced, making it impossible to stably light the lamp, and if the lamp continues to be lit unstablely, the life of the lamp will be shortened. There was this inconvenience. On the other hand, in order to prevent such a situation, increasing the electric power of the filament 1 to allow sufficient preheating during dimming, especially deep dimming, will cause the inconvenience of increased power loss during full brightness. be.

(Object of the Invention) The present invention has been made in view of the above-mentioned problems, and provides a discharge lamp dimmer device including a phase controller and a discharge lamp lighting device, in which the C. Based on the concept of supplying the filament power of the discharge lamp through a switching element that is always conductive only in the range where the output from the phase controller exists, the preheating power of the filament is supplied regardless of whether it is at full light or dimming. The purpose is to keep it constant.

(Structure of the Invention) The present invention comprises an AC power supply, a phase controller that generates a phase-controlled output from the AC power supply, a lighting circuit that lights a discharge lamp using the phase-controlled output, and a lighting circuit that lights a discharge lamp using the phase-controlled output. In a discharge lamp dimmer device equipped with a filament transformer that supplies filament power of the discharge lamp from the output of the filament transformer, a switch element is inserted in series with the filament transformer, and this switch element is connected to the minimum The feature is that conduction occurs within a conduction section.

(Explanation of Examples) Hereinafter, the present invention will be described in detail with reference to the drawings.

Note that parts common to or corresponding to those of the conventional example are denoted by the same reference numerals.

The device shown in FIG. 1 has a filament transformer 501 connected between the output terminals of the phase controller 2.
A switch element such as a triac 6 is connected in series with the next winding 5p.
is inserted. Furthermore, a so-called high frequency superimposition type lighting circuit is shown as a specific example of the discharge lamp lighting circuit 4.

In this discharge lamp dimmer, the phase controller 2 has a phase (
In FIG. 3 φ1), ignition is performed every half cycle of alternating current by an ignition pulse supplied to the gate from a control circuit (not shown). As a result, power is supplied to the lighting circuit 4, and the lighting circuit 4 applies a superimposed voltage of the low frequency voltage output from the phase controller 2 and the high frequency voltage output from the high frequency generator 41 to the lamp 3. However, the two chokes 42 that relight the lamp 3 prevent the high frequency current from flowing into the low frequency circuit side and act as a current limiting element for the low frequency current, and the capacitor 43 prevents the low frequency current from flowing into the high frequency circuit. It prevents the current from flowing into the output end of the device 41 and acts as a current limiting element for high frequency current.

Subsequently, when the phase of the AC power supply 1 exceeds π and the lamp current becomes O (φ2), the switch element 21 of the phase controller 2 turns A off. This causes the phase controller 2 to conduct only between phases φ1 and φ2. This conduction section is determined by the firing phase φ1, which is set by the aforementioned setting volume.

However, as the firing phase φ1 becomes larger, the voltage (peak value) output from the phase controller 2 becomes lower. Therefore, at a certain phase φ3 or more, the output of the lighting circuit 4 becomes lower than the re-ignition power of the lamp 3, and the lamp 3 is no longer lit.

Therefore, this phase φ3) or smaller phase φm is the maximum phase that can be used in this dimming device, and φ■
The minimum conduction section is between and φ2.

This discharge lamp dimmer is characterized in that the switch 6 is made conductive only within the minimum conduction section. That is, the conduction section of the switch 6, for example φ4 to φ5, is the conduction section of the switch 21, regardless of whether the lamp 3 is in full brightness or dimming (excluding defective points).
The filament is always supplied with electric power determined by the conduction section of the switch 6.

In addition, in the above-mentioned embodiment, an example was shown in which a so-called high-frequency superimposition type was used as the stipple circuit, but this lighting circuit also uses a so-called electronic ballast with a built-in inverter, a ballast I- or a step-up leakage transformer. It can be of any format.

(Effects of the Invention) As described above, according to the present invention, the filament preheating power is supplied only in a predetermined section within the section where the phase controller is always on! Appropriate filament preheating can be performed regardless of whether the light is dimmed, full light, or dimmed.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional discharge lamp dimmer, Fig. 2 is a circuit diagram of a discharge/lamp dimmer according to an embodiment of the present invention, and Fig. 3 is a circuit diagram of a discharge lamp dimmer shown in Fig. 2. J3GJ for dimmer
There are waveform diagrams for each part. 1... AC power supply, 2... Iil phase controller, 3...
Lamp, 4... point KJ circuit, 5... ficimen 1~
1-Lance, 6...Switch. Patent Applicant Toshiba Electric Materials Co., Ltd. Agent Patent Attorney Tatsuo Ito Agent Patent Attorney Tetsuya Ito Figure 1 Figure 3

Claims (1)

[Claims] An AC power supply, a phase controller that generates a phase-controlled output from the AC power supply, a lighting circuit that lights a discharge lamp using the phase-controlled output, and a lighting circuit that lights a discharge lamp using the phase-controlled output. A switch element is installed in series with the J5-C1 filament transformer, which is equipped with a filament transformer that supplies the filament power of the discharge lamp.
A discharge pair dimming device characterized in that when LrI is turned on, this switch element becomes conductive within a minimum conduction section of the phase controller.