JP2002231040A - High pressure mercury lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact high pressure mercury lamp device with low cost which is effective for prevention of crimes due to a lighted feeling. SOLUTION: The high pressure mercury lamp comprises a current limiting circuit 2, having a choke coil 2a through which, a lighting circuit 1 is connected to a power source of the high pressure mercury lamp, and a phase advancer capacitor 2b, a rectifier circuit 3, a voltage doubler circuit 4, and a smoothing circuit 5. A loss of light is prevented by vertically mounting the high pressure mercury lamp 7 connected to the lighting circuit 1 inside a conical hood, and by making a part of a brightness of the light source expose from the conical hood, and by making the light emitted from the high pressure mercury lamp return to the high pressure mercury lamp by the reflection of the conical hood by shifting the mounting position of the high pressure mercury lamp from the center of the conical hood.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure mercury lamp used for a security light such as a street light.

[0002]

2. Description of the Related Art A lighting circuit for lighting a high-pressure mercury lamp used for a security light such as a street light is called a ballast, and has a current limiting function for starting the mercury lamp and lighting it stably after lighting. As a conventional lighting circuit, for example, as described in JP-A-10-144483,
There is a voltage doubler rectifier circuit, which is configured by a combination of a diode bridge connection and a capacitor, or a diode and capacitor bridge connection in order to double the rectified voltage. In addition, there is an inverter-based method for boosting the rectified DC voltage. Further, the current limiting element includes a resistor, a choke coil, and a choke coil + capacitor. Current limiting by a resistor is not generally used because efficiency becomes extremely poor, and current limiting is performed by a choke coil.

[0003] In general, 20 W fluorescent lamps are generally used as security lights, such as street lights, which are installed outdoors. When they are installed on roads, most of them are installed on telephone poles. In general, the shape of the lighting equipment is made of milky white acrylic so as to cover the light source light emitting part of the lighting equipment in order to suppress glare (the surroundings of the light source become difficult to see if there is a high brightness light source in the viewpoint). By attaching a plate or a glass plate, it is designed so that the luminance does not increase more than necessary.

[0004]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 10-14 / 1998
The lighting circuit described in Japanese Patent No. 4483 is realized by attaching one capacitor between the output (+) side of the bridge and the input (AC) in order to double the voltage after rectification. However, when the load side is viewed from the power supply side, the circuit is not balanced, and the current is distorted due to the non-linear load of the mercury lamp as the load, and harmonics are generated. In particular, when the circuit is not balanced, harmonics of even harmonics are generated, and the harmonic suppression guideline (level C) is not cleared. As described above, in the conventional voltage doubler circuit, it was difficult to keep harmonics within the guidelines. In addition, the efficiency of current limiting is reduced when a capacitor is used, and the efficiency is reduced and expensive when a choke coil is used.

[0005] Further, when a street light is mounted on a utility pole, the installation interval of the utility pole is about 40 m, and even if a 20 W fluorescent lamp type security light is installed at that interval, only the area directly below the utility pole is bright, and the brightness on the road surface is low. It is sparse and not bright enough to distinguish human faces, and is far from the "public outdoor lighting standard for pedestrians" proposed by the Illuminating Engineering Institute of Japan. On the other hand, the crime deterrent effect of the crime prevention light is to suppress crime by a psychological effect that a person who is going to commit a crime is seen from the other party by the illumination light. Therefore, it is desirable to install a large number of security lights and to be able to distinguish the face of a person who is committing a crime from a distance, but the main body of the security lights is the local residents' association,
Municipal subsidies for security light installations are also limited,
The actual state of security light installation is not such. However, it is said that the conventional 20 W fluorescent lamp is insufficient in brightness and induces crime, and it is said that a mercury lamp is most suitable as a security light. However, mercury lamps are large and expensive, and further increase the electricity contract fee. For this reason, it is rarely used in humanitarian areas, except where a mercury lamp is installed.

Accordingly, the present invention is to provide a compact and inexpensive high-pressure mercury lamp device which has a sense of brightness and can improve the security effect.

[0007]

The high-pressure mercury lamp device according to the present invention is a high-pressure mercury lamp device in which a high-pressure mercury lamp is vertically mounted in a trapezoidal conical hood having a divergent vertical section. A lighting circuit is a current limiting circuit including a choke coil and a phase-advancing capacitor connected to a power supply, a rectifying circuit including a diode bridge connected to the current limiting circuit, and connected to an input side and an output side of the diode bridge, respectively. A high voltage mercury lamp, which is composed of a voltage doubler circuit composed of a capacitor and a smoothing circuit connected to the voltage doubler circuit and connected to the lighting circuit, partially exposes the brightness of the light source from the conical hood, The light emitted from the high-pressure mercury lamp is reflected by the hood by shifting the mounting position of the lamp from the center of the Characterized in that it prevented the loss of light due to return to the mercury lamp.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a circuit which is symmetrical by adding a new capacitor between the output side of a bridge and the input (AC), thereby suppressing harmonics of even harmonics. Regarding the current limitation, in the case of a 40 W mercury lamp, it takes 2 to 5 minutes from the start of lighting to stable lighting. During that time, about 2 A of current flows and only about 0.5 A flows in the stable lighting state. Therefore, the current limitation was limited to only the stable lighting state, and the efficiency of the current limitation was ignored immediately after the start of lighting.

FIG. 1 is a lighting circuit diagram of a mercury lamp device according to the present invention. The lighting circuit 1 includes a current limiting circuit 2 including a choke coil 2a and a phase-advancing capacitor 2b, and a diode bridge connected to the current limiting circuit 2. Rectifier circuit 3
And the capacitors 4 on the positive and negative sides of the diode bridge
A voltage doubler circuit 4 composed of a and 4b, a discharge resistor 5, a smoothing circuit 6 composed of an electrolytic capacitor 6a and a choke coil 6b are connected to a high-pressure mercury lamp 7.

Since a capacitor 4a is added between the output side and the input side of the bridge of the voltage doubler circuit 4 to make the circuit symmetrical, the input waveform (AC) of the entire electric circuit is changed between the positive side and the negative side. Have substantially the same waveform, the second harmonic is reduced, and a circuit for suppressing even harmonics is obtained. This makes it possible to clear the harmonic suppression guideline (level C).

Further, in the present invention, the choke coil 2a having an impedance value of only the current limit in a stable state is employed for the current limit, so that the choke coil is 1/3 to 1/2 as compared with the conventional magnetic circuit type ballast. The size is reduced to about the same volume, which reduces copper loss and iron loss, and greatly improves the efficiency.
The degree could be improved. In addition, since the current is applied to the high-pressure mercury lamp by DC lighting, the waveform ratio of the current applied to the high-pressure mercury lamp is close to 1, so that the load on the electrodes is reduced and the deterioration of the lamp can be reduced.

FIG. 2 is a side view of a high-pressure mercury lamp device according to the present invention. The hood to which the high-pressure mercury lamp 7 is attached is a trapezoidal aluminum conical hood 8 having a flared vertical section. In the conical hood 8, choke coils 9 and 10, which constitute a lighting circuit, a rectifier circuit, a voltage doubler circuit,
Electronic components 11 such as a diode, a capacitor, and a resistor constituting a discharging resistor and a smoothing circuit are built in, connected to a power line cord 12, and the conical hood 8 is fixed to a utility pole or the like by a mounting bracket 13.

The mounting position of the high-pressure mercury lamp 7 is shifted not by the center of the conical hood 8 but by about w (10 mm) from the center of the conical hood 8 as shown in FIG. By displacing the high-pressure mercury lamp 7, it is possible to prevent light emitted from the high-pressure mercury lamp 7 from being reflected by the conical hood 8 and returning to the high-pressure mercury lamp 7, thereby preventing loss of light.

If the luminance of the light source is too high, glare (the degree of invisibility) will occur. On the other hand, a certain level of luminance will be a measure of human psychology (brightness). In order to partially improve the brightness of the high-pressure mercury lamp 7, the tip of the mercury lamp is disposed at a position protruding h from the tip of the outer lamp hood as shown in FIG.

The high-pressure mercury lamp is mounted vertically so that light can reach as far as possible from directly below.

As the high-pressure mercury lamp, a small-capacity high-pressure mercury lamp whose illuminance is slightly higher than that of a 20 W fluorescent lamp is used. Can be done.

[0017]

According to the present invention, the high-pressure mercury lamp device is used as a security light and its shape is designed to have a high value within a range that does not cause glare. Become.

Further, the high-pressure mercury lamp device of the present invention is compact, inexpensive and has a bright feeling, and is expected to be used in a wide range.

[Brief description of the drawings]

FIG. 1 is a lighting circuit diagram of a mercury lamp device according to the present invention.

FIG. 2 is a side view of the high-pressure mercury lamp device according to the present invention.

[Explanation of symbols]

 1: lighting circuit 2: current limiting circuit 2a: choke coil 2b: phase-advancing capacitor 3: rectifier circuit 4: voltage doubler 4a, 4b: capacitor 5: discharge resistor 6: smoothing circuit 6a: electrolytic capacitor 6b: choke coil 7 : High pressure mercury lamp 8: Conical hood 9, 10: Choke coil 11: Electronic component 12: Power line cord 13: Mounting bracket

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kosuke Yoshioka 8-17-31 Kasuga Kumamoto-shi Koyo Electric Appliances Co., Ltd. Inside Research Institute Co., Ltd.

Claims (1)

[Claims] 1. A high-pressure mercury lamp device in which a high-pressure mercury lamp is vertically mounted in a trapezoidal conical hood having a flared trapezoidal longitudinal section. A current limiting circuit composed of a capacitor, a rectifier circuit composed of a diode bridge connected to the current limiting circuit, and a voltage doubler circuit composed of capacitors respectively connected to the input side and the output side of the diode bridge;
The high-pressure mercury lamp connected to the lighting circuit comprises a smoothing circuit connected to the voltage doubler circuit. The high-pressure mercury lamp partially exposes the brightness of the light source from the conical hood. A high-pressure mercury lamp device characterized in that light emitted from the high-pressure mercury lamp shifted from the center is reflected by the hood and light loss caused by returning to the high-pressure mercury lamp is prevented.