Electric discharge lamp lighting device
AssigneeHitachi, Ltd.
InventorsTeruichi Tomura, Mitsuo Akatsuka, Hiroyuki Iyama
Life of this patent
Estimating the term…
Abstract
An electric discharge lamp lighting circuit in which a discharge lamp is lighted by a circuit comprising a semiconductor switching circuit in which the cathode of a first thyristor is connected to the gate of a second thyristor and the first and second thyristors are commonly connected at the respective anodes, an integration circuit consisting of a capacitor and a resistor and connected between the gate of the first thyristor and the cathode of the second thyristor, a resistor connected between the integration circuit and the anode of the first thyristor, and a resistor connected between the gate and cathode of the second thyristor.
Claims31
An electric discharge lamp lighting device comprising a discharge lamp having filaments with terminals, said discharge lamp being connected through an inductive ballast to an A.C. power source between first terminals of said filaments thereof, and to a semiconductor switching circuit between second terminals of said filaments of the discharge lamp, said semiconductor switching circuit including:
- a first thyristor;
- a second thyristor whose anode and cathode are connected to the anode and gate of said first thryistor, respectively;
- and
- an integration circuit including at least a capacitor and connected between the anode and the cathode of said first thyristor, said capacitor, being connected between the gate of said second thyristor and the cathode of said first thyristor.
An electric discharge lamp lighting device comprising a discharge lamp having filaments with terminals, said discharge lamp being connected through an inductive ballast to an A.C. power source between first terminals of said filaments thereof, and to a semiconductor switching circuit between second terminals of said filaments of the discharge lamp, said semiconductor switching circuit including:
- a thyristor with an amplifying gate whose anode and cathode are connected between the second terminals of said filaments of said discharge lamp;
- and
- an integration circuit including at least a capacitor and connected between the anode and the cathode of said thyristor, said capacitor being connected between the gate of said thristor and the cathode of said thristor.
An electric discharge lamp lighting device comprising a discharge lamp having filaments with terminals, said discharge lamp being connected through an inductive ballast to an A.C. power source between first terminals of said filaments thereof, and to a semiconductor switching circuit connected between second treminals of said filaments of the discharge lamp, said semiconductor switching circuit including:
- a thyristor;
- a transistor whose collector and emitter are connected respectively to the anode and the gate of said thyristor;
- an integration circuit connected between the collector of said transistor and the cathode of said thyristor and having at least a capacitor, said capacitor being connected between the base of said transistor and the cathode of said thyristor;
- and
- a diode connected in series with the collector of said transistor.
An electric discharge lamp lighting device comprising a discharge lamp having filaments with terminals, said discharge lamp being connected through an inductive ballast to an A.C. power source between first terminals of said filaments thereof, and to a semiconductor switching circuit between second terminals of said filaments of the discharge lamp, said semiconductor switching circuit including:
- a thyristor with amplifying gate;
- and
- an integration circuit including at least a parallel connection of a capacitor and resistor connected between the amplifying gate and cathode of said thyristor, and another resistor connected between the amplifying gate and anode of said thyristor.
Dependencies are inferred from the claim text.