JPS6127120Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Technical Field of the Invention] This invention relates to a lighting device using an unsaturated high pressure discharge lamp. [Prior art] Unsaturated high pressure discharge lamps such as high pressure mercury lamps are
It is used for many purposes both indoors and outdoors. However, due to the need for energy conservation in recent years, in order to save as much power as possible for lighting, some of the lamps that were previously lit are turned off to save power. If the lights are turned on in a thinned-out manner in this way, the illuminance of the illuminated area will be uneven, which will hinder work, and is therefore not a practical method. There is also a way to save lighting power by replacing the lamp with a different type of lamp with higher efficiency.
In this case, work is required to reinstall the lighting equipment, which increases costs, and even if the installation work of the equipment is not necessary and a method of replacing only the lamp is adopted, This often resulted in unnecessary brightness that was higher than before, or the light color of the lamp was significantly different, causing problems with work. [Summary of the invention] This invention uses an unsaturated high-pressure discharge lamp with a higher lamp voltage than conventional lamps to be lit using a Chi-Yoke type slow-phase ballast.
This makes it possible to save power for lighting, and to reduce the power consumption of the lighting device without causing problems such as uneven illuminance caused by thinned lighting. [Example of the invention] This invention will be explained in detail below using the drawings. The figure is for explaining the principle of this invention, and shows the lamp voltage, lamp power, and ballast when 400W high-pressure mercury lamps with various lamp voltages are lit with a general Chiyoke-type slow-phase ballast for 200V. FIG. 3 is a characteristic diagram showing the relationship between input power. In the figure, the horizontal axis represents the lamp voltage, and the vertical axis represents the power, the curve L represents the lamp power, and the curve B represents the input power to the ballast. As is clear from the figure, as the lamp voltage increases, both the lamp power L and the ballast input power B increase, or when the lamp voltage is around 120V, both L and B reach their maximum values, and the lamp voltage increases.
When it exceeds 120V, both L and B decrease. The rated lamp voltage of the conventional 400W high pressure mercury lamp is
130V, the lamp power L at this value is 397W,
Ballast input power B was 436W. The difference between the lamp power L and the ballast input power B is the power consumption of the ballast, and the power consumption of the ballast at the rated lamp voltage of 130V was 436W-397W=39W, which was 39W. This idea focused on the characteristics of the high-pressure mercury lamp shown in the figure, and by lighting a high-pressure mercury lamp with a higher lamp voltage than conventional lamps using a Chiyork-type slow-phase ballast, the power consumption for lamp lighting was significantly reduced. This made the reduction possible. Table 1 shows the ballast input power, input side power reduction rate, and
Shows lamp power, lamp side power reduction rate, and ballast power consumption. As is clear from this table and figure, as the lamp voltage increases, both the ballast input power and the lamp power decrease significantly, and at the same time, the ballast power consumption also decreases. Conventionally, in the case of a 400W high-pressure mercury lamp, the rated lamp voltage is 130V, but in consideration of manufacturing variations, lamps with lamp voltages in the range of 120V to 140V are used.

[Effect of idea]

As mentioned above, this idea was developed by lighting an unsaturated high-pressure discharge lamp with a higher lamp voltage than before using a Chi-Yoke type slow-phase ballast. Since the lamps can be turned on, the power consumption of the lighting device can be easily saved without causing uneven illumination due to thinned-out lighting or adverse effects due to changes in the light color of the lamps. Further, the luminous efficiency of the lamp can be the same as the conventional lamp, or it can be improved by the reduction in the proportion of power consumption of the ballast. Furthermore, in this invention, if a lamp of the same shape as a conventional lamp is used, the load on the lamp will be reduced by the reduction in lamp power, and the life of the lamp can be expected to be extended. Furthermore, when the lamp of this invention is lit, the power consumption of the ballast is reduced compared to conventional lamps, so the life of the ballast itself can be expected to be extended.

[Brief explanation of the drawing]

The figure is a characteristic diagram when 400W high-pressure mercury lamps with various lamp voltages are lit using a general slow-phase ballast for 200W. In the figure, the horizontal axis represents lamp voltage, the vertical axis represents power, curve L represents lamp power, and curve B represents ballast input power.

Claims (1)

[Scope of utility model registration request] The lamp voltage of an unsaturated high pressure discharge lamp is 145V.
180V or less, and the unsaturated high-voltage lamp is lit by a Chi-Yoke type slow-phase ballast whose secondary voltage (voltage on the lamp side) is less than 220V.