Matsushita Electric Works, Ltd.

Tadahiro Kono

Toshiya Kanja

Yukio Yamanaka

Nobukazu Miki

Katsumi Sato

Yoshikazu Kado

Hiroshi Nishimura

Toshihiro Nishida

Minorua Maehara

An electronic ballast for a discharge lamp has a compact arrangement of electric parts. The ballast includes an AC-DC converter and an inverter giving a high frequency output voltage for operating the lamp. The inverter includes switching elements, a control circuit, and an output transformer for connection with the lamp. A single circuit board mounts the electric parts forming the converter and the inverter. The circuit board is accommodated within a tubular casing together with a dielectric sheet which is provided for insulating the circuit board as well as the electric parts from the casing. The output transformer is mounted on a top surface of the circuit board together with some of the other electric parts. The ballast includes chip components forming a detection circuit for lamp condition, and the circuit board mounts the chip components on a bottom surface at a location immediately opposite of the output transformer.

Electronic ballast for a discharge lamp

An electric power source device is provided with a current compensating circuit capable of feeding to switching elements included in an inverter circuit currents substantially mutually anti-phase, the current compensating circuit thus reducing the currents flowing to the switching elements and allowing the switching elements of a small current rating to be utilizable.

Power source device

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Osaka, Japan

Tadahiro Kono