An electronic ballast for an HID lamp

External appearance of an HID spotlight fitted with an electronic ballast

Fig.1 External appearance of an HID spotlight fitted with an electronic ballast

External appearance of an electronic ballast for a 70-W HID lamp

Fig.2 External appearance of an electronic ballast for a 70-W HID lamp

  A compact HID lamp at low power output needs to be fitted with a ballast. As for conventional copper/iron ballasts , since they are big and heavy, electrification of a stabilizer has long coveted.

  The electronic ballast for a fluorescent lamp already in widespread use is a method of operating at high frequencies of several tens of kilohertz. At such high frequency, when a HID lamp is switched on, the phenomenon of “acoustic resonance” occurs, and the lamp could fade out or fail. In August 1986, a compact HID lamp (“sky-beam spotlight”)—incorporating a compact and light all-electronic stabilizer—for general lighting use was finally put into practical use.

  In regards to this new electronic ballast for an HID lamp, a low-frequency rectangular-wave lighting method is adopted. If a commercial power source is rectification smoothed, and a high-frequency voltage is generated, it is converted to a rectangular-wave voltage of several tens to several hundred hertz. In concrete terms, a double step-down chopper inverter is realized.

  The engineers at Matsushita Electric Works, Ltd. Who advanced this research and development—Minoru Fukuhara, Haruo Nagase, Tsutomu Shiomi, Kouji Nishimura, Takaaki Uchihashi, and Akiko Okuide—received the “Japan Lighting Award” from the Illuminating Engineering Institute of Japan in 1987. Even today, this low-frequency rectangular-wave lighting method is still the mainstream method for HID-lamp electronic ballasts and in production around the world. In recent years, a compact HID lamp has been used in applications such as car headlamps and data projectors, and the low-frequency rectangular-wave lighting method is also being used for lighting control in these applications.


Related Researches

Category

Illuminating
(Ballast)

Events in World

1987
Great Crash in New York Stock Exchange (Black Monday) happened.
1987
The Japanese National Railways was privatized and split up, and JR was inaugurated.
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