High-pressure discharge lamp lighting apparatus

Patent 6049179 Issued on April 11, 2000. Estimated Expiration Date:

March 23, 2018. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

Power regulator of discharge lamp and variable color illumination apparatus using the regulator Patent #: 5491388
Issued on: 02/13/1996
Inventor: Nobuyuki, et al.

Inventors

Assignee

Application

No. 045906 filed on 03/23/1998

US Classes:

315/307, Automatic regulation315/224, Impedance or current regulator in the supply circuit315/247With power factor control device

Examiners

Primary: Vu, David

Attorney, Agent or Firm

Oblon, Spivak, McClelland, Maier & Neustadt, P.C.

Foreign Patent References

9-55296 JP. 02/13/1997

International Class

H05B 037/02

Foreign Application Priority Data

1997-11-28 JP

Abstract

To provide a high-pressure discharge lamp lighting apparatus which is adapted to be used in common for several kinds of AC voltages such as 100 V and 200 V, which is small in size, and which can secure good starting property with less circuit loss in use at any of the AC voltages, the apparatus is provided with a diode bridge for rectifying an AC voltage, an active filter for converting, with a high power factor, an AC voltage into a DC voltage, a current limiting circuit for controlling the current to be made to flow in the high-pressure discharge lamp, an inverter for converting a DC voltage into a low-frequency AC voltage, a high-voltage pulse circuit for generating a high-voltage pulse for starting the high-pressure discharge lamp, and a control circuit for controlling the active filter, the current limiting circuit, the inverter, a discharge-lamp voltage detecting circuit, a discharge-lamp current detecting circuit and the high-voltage pulse circuit.