Title:
HIGH-VOLTAGE DISCHARGE LAMP IGNITION DEVICE, PROJECTOR USING THIS HIGH-VOLTAGE DISCHARGE LAMP IGNITION DEVICE, AND HIGH-VOLTAGE DISCHARGE LAMP IGNITION METHOD
Document Type and Number:
WIPO Patent Application WO/2013/114487
Kind Code:
A1
Abstract:
A computational processing unit (11) controls a frequency control unit (13) and a DC-AC conversion circuit (6) so as to repeat: a period (A) in which, after the lapse of a period (a1) in which the current is maintained at one polarity, there is continued for at least two cycles maintenance of the current with inverse polarity to the aforesaid polarity for a period (a2) that is shorter than the length of the period (a1); and a period (B), which is at least the period (a1), in which the polarity is maintained constant. Also, the computation processing unit (11) controls a PWM control unit (12) and a voltage step-down circuit (5) so that, after maintaining the current absolute value at a first current value during the period (A), the absolute value of the current is maintained at a second current value larger than the first current value during the period (B).
Inventors:
MORIMOTO HIROJI
ONO SYUNSUKE
OZASA MINORU
ONO SYUNSUKE
OZASA MINORU
Application Number:
PCT/JP2012/006722
Publication Date:
August 08, 2013
Filing Date:
October 19, 2012
Export Citation:
Assignee:
PANASONIC CORP (JP)
International Classes:
H05B41/24; G03B21/14
Foreign References:
| JP2008300309A | 2008-12-11 | |||
| JP2009026747A | 2009-02-05 | |||
| JP2006156414A | 2006-06-15 | |||
| JP2008034187A | 2008-02-14 | |||
| JP2005038815A | 2005-02-10 | |||
| JP3738712B2 | 2006-01-25 |
Attorney, Agent or Firm:
NAKAJIMA, Shiro et al. (JP)
Shiro Nakajima (JP)
Shiro Nakajima (JP)
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Claims:
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