Other

Kazuhiko Tsugita

Hiroaki Nishikawa

Isamu Ogawa

Kenji Hamazaki

Osamu Takahashi

Osamu Ishikawa

Koji Shibata

Tetsuya Kobayashi

Kouji Shibata

Yasunori Ieki

Moriaki Okuda

Tetuya Kobayashi

Isao Masatika

Naoki Wada

Tadashi Maeda

The discharge lamp lighting apparatus includes: a direct current power supply E; switching elements Q and Q for switching a direct current supplied from the direct current power supply E so as to generate a high frequency current; a discharge lamp load circuit LAC which is constructed in a manner that a discharge lamp LA and a coupling capacitor C are connected in series, and the discharge lamp LA is lit by a high frequency current generated by the switching elements Q and Q ; a switching element control circuit IC for controlling the switching elements Q and Q . The discharge lamp lighting apparatus is further provided with a protective circuit NP which distinguishes a fault of the discharge lamp LA by detecting a voltage generated in the coupling capacitor C , and outputs a control signal to the switching element control circuit IC

Discharge lamp lighting apparatus

A discharge lamp lighting device in which dim control can be performed for a discharge lamp continuously and stably in a wide range, and which is simple in circuit configuration and low in price. The discharge lamp lighting device comprises: an inverter (IV) for turning on/off switching elements (Q,, Q,) by an oscillation output signal of an IV control integrated circuit (IC,) to thereby invert a voltage of a DC power supply (E) into high-frequency electric power, a discharge lamp (LA) capable of being lighted by the high-frequency electric power from the inverter (IV), a feedback circuit (FB) having delay time T (unit: second) expressed by 1/f&lE;T&lE;1/10,000 when the frequency of the high-frequency electric power is f, the feedback circuit (FB) including a reference value setting means (R,) for setting a reference value, the feedback circuit outputting a voltage for controlling the IV control integrated circuit (IC,) to make the high-frequency electric power equal to the reference value.

Discharge lamp lighting device

Growing community of inventors

Kamakura, Japan

Kazuhiko Tsugita