Device for operation of a high pressure discharge lamp and a projector device

Projector device which comprises:

• a rotary filter having color regions of at least R(ed)G(reen)B(lue);
• a rotary drive means for the rotary filter;
• a space modulation element which receives light which has passed through the rotary filter;
• and
• an operation device for operating a high pressure discharge lamp,
• wherein the operation device has a high pressure discharge lamp with a silica glass discharge vessel in which a pair of opposed electrodes are located and on which a trigger electrode is located, and a feed device which supplies an alternating discharge current to the high pressure discharge lamp, said feed device comprising:
• a starter circuit which produces a high voltage with respect to the trigger electrode when operation is started;
• an inverter circuit which has at least two switching devices;
• a coil which is located downstream of this inverter circuit, which is series-connected to the discharge lamp and which has an inductance of at most 210 μH;
• and
• a control element which subjects the switching devices to on/off driving in alternation with a dead time, and
• wherein the control element subjects the switching devices to on/off driving asynchronously to the rotary filter and the space modulation element.

Device for operating a high pressure discharge lamp which comprises the following:

• a high pressure discharge lamp having a silica glass discharge vessel in which a pair of opposed electrodes are located;
• and
• a feed device which supplies an alternating discharge current to the high pressure discharge lamp,
• wherein the feed device comprises:
• a starter circuit which applies a direct current high voltage to the electrodes when operation is started;
• an inverter circuit which has at least two switching devices;
• a coil which is located downstream of the inverter circuit and is series-connected to the discharge lamp;
• and
• a control element which subjects the switching devices to on/off driving in alternation with a dead time, and
• wherein the starter circuit comprises:
• a capacitor which applies a direct current high voltage to the discharge lamp;
• a charging circuit for the capacitor;
• a diode for preventing a reverse current with respect to the high voltage direct discharge current of the capacitor and which is series-connected to the discharge lamp;
• and
• a circuit which short circuits the diode to prevent a reverse current during rated operation, and
• wherein the inductance of the coil is less at most 210 μH.

Projector device which comprises:

• a rotary filter having color regions of at least R(ed)G(reen)B(lue);
• a rotary drive means for the rotary filter;
• a space modulation element which receives light which has passed through the rotary filter;
• and
• an operation device for operating a high pressure discharge lamp,
• wherein the operation device has a high pressure discharge lamp with a silica glass discharge vessel in which a pair of opposed electrodes are located, and a feed device which supplies an alternating discharge current to the high pressure discharge lamp, the feed device comprising:
• a starter circuit which applies a direct current high voltage to the electrodes when operation is started;
• an inverter circuit which has at least two switching devices;
• a coil which is located downstream of this inverter circuit, which is series-connected to the discharge lamp, and which has an inductance of at most 210 μH;
• and
• a control element which subjects the switching devices to on/off driving in alternation with a dead time, and
• wherein the starter circuit comprises:
• a capacitor which applies a high voltage direct discharge current to the discharge lamp;
• a charging circuit for the capacitor;
• a diode for preventing a reverse current with respect to the direct current of said capacitor and which is series-connected to the discharge lamp;
• and
• a circuit which short circuits said diode to prevent a reverse current during rated operation, and
• wherein the control element subjects the switching devices to on/off driving asynchronously to the rotary filter and to the space modulation element.