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US 7,138,769 B2Granted
Device for operation of a high pressure discharge lamp and a projector device
AssigneeUshiodenki Kabushiki Kaisha
InventorsYoshikazu Suzuki, Katumi Sugaja, Tomoyoshi Arimoto
Life of this patent
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Abstract
A device for operating a discharge lamp of the alternating current operating type 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, a feed device which supplies an alternating discharge current to the high pressure discharge lamp, the feed device having a starter circuit, an inverter circuit with 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 produces on/off driving in alternation with a dead time, and in which the inductance of the coil is at most 210 μH.
Claims6
Device for operating a high pressure discharge lamp which comprises:
- a high pressure discharge lamp having a silica glass discharge vessel, a pair of opposed electrodes located in the discharge vessel and a trigger electrode located outside of the discharge vessel;
- and
- a feed device which supplies an alternating discharge current with a rectangular waveform to the high pressure discharge lamp,
- wherein the feed device comprises:
- 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 the inverter circuit and which is series-connected to the discharge lamp;
- and
- a control element which subjects the switching devices to on and off driving in alternation, with a dead time, and
- wherein the inductance of the coil is at most 210 μH;
- and
- wherein the feed device subjects the discharge lamp to operating control with a rated operating frequency in the range of from 60 Hz to 1000 Hz.
9 more elements
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 with a rectangular waveform 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;
- and
- wherein the feed device subjects the discharge lamp to operating control with a rated operating frequency in the range of from 60 Hz to 1000 Hz.
15 more elements
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 with a rectangular waveform 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;
- and
- wherein the feed device subjects the discharge lamp to operating control with a rated operating frequency in the range of from 60 Hz to 1000 Hz.
11 more elements
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 with a rectangular waveform 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;
- and
- wherein the feed device subjects the discharge lamp to operating control with a rated operating frequency in the range of from 60 Hz to 1000 Hz.
17 more elements
Dependencies are inferred from the claim text.