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

• US 7,138,769 B2
• Filed: 12/16/2004
• Issued: 11/21/2006
• Est. Priority Date: 12/25/2003
• Status: Active Grant

• Current Assignee: Ushio Denki Kabushiki Kaisha
• Original Assignee: Ushio Denki Kabushiki Kaisha
• Inventors: Sugaja, Katumi, Arimoto, Tomoyoshi, Suzuki, Yoshikazu
• Primary Examiner(s): Philogene, Haissa
• Application Number:
  US11/012,176
• Publication Number:
  US 20050140311A1
• Time in Patent Office: 705 Days
• Field of Search: 315 57- 63, 315/246, 315/289, 315/290, 315/224, 315/219, 315/225, 315/282, 315/291, 315/261, 315/263, 315/209.R, 315/307, 315/DIG.5, 315/DIG.7, 353/98, 353/107
• US Class Current: 315/289
• CPC Class Codes: H01J 61/547 using an auxiliary electrode outside the vessel H01J61/544 takes precedence
• CPC Class Codes: H01J 61/86 with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection
• CPC Class Codes: H05B 41/042 using semiconductor devices
• CPC Class Codes: H05B 41/19 for lamps having an auxiliary starting electrode
• CPC Class Codes: H05B 41/2881 Load circuits; Control thereof
• CPC Class Codes: H05B 41/2888 the bridge being commutated at low frequency, e.g. 1kHz
• CPC Class Codes: Y02B 20/00 Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
• CPC Class Codes: Y10S 315/05 Starting and operating circuit for fluorescent lamp

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.

Claims

1. 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 μ

H; 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.

2. Device for operation of the high pressure discharge lamp as claimed in claim 1, wherein the feed device is adapted to operate the discharge lamp intermittently only short time intervals with a frequency which is lower than the rated operating frequency and is in a range of from 5 Hz to 100 Hz.

3. 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 μ

H; 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.

4. Device for operation of the high pressure discharge lamp as claimed in claim 3, wherein the feed device is adapted to operate the discharge lamp intermittently only short time intervals with a frequency which is lower than the rated operating frequency and is in a range of from 5 Hz to 100 Hz.

5. 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 μ

H; 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.

6. 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 μ

H; 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.