Power supply apparatus for light source
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 16, 2004
Grant Date -
Sep 18, 2003
app pub date -
Dec 18, 2002
filing date -
Dec 21, 2001
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A power supply apparatus for a light source includes an input-side rectifier (32) which converts an input AC signal to a DC signal, and a high-frequency inverter (36) which converts the DC signal to a high-frequency signal. An output-side rectifier (42) converts the high-frequency signal to a DC output signal for application to the light source. Power detecting means (52) detects the power supplied to the light source through the application of the DC output signal thereto, and develops a power representative signal. A control circuit (38), a summer (54) and an error amplifier (58) cooperate to control the high-frequency inverter (36) in accordance with the power representative signal in such a manner that power of a predetermined value can be supplied to the light source. An input current detector (60) detects the input AC signal current value and develops an input current representative signal. When the input current representative signal is smaller than a predetermined input current reference value, a summer (62) and an error amplifier (66) cooperate to provide the summer (54) with such a control signal as to maintain the input AC signal current value at a predetermined value.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully