Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2005-08-05
2009-11-03
Riley, Shawn (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S283000
Reexamination Certificate
active
07612542
ABSTRACT:
This invention realizes control without using a current-detecting element to prevent over current from flowing into a switching element of a switching converter in response to an input primary voltage from a small-capacity DC power source. The switching converter includes an FET30that turns the input primary voltage from the DC power source1on and off, and a choke coil31that is charged or discharged according to turning on/off of this FET30. A driver13drives the FET so that an output voltage detected by an output voltage detector9is converged to a target voltage. A means for calculating a current I that flows into the FET30based on a duty ratio of the input primary voltage and the FET30and the inductance of the choke coil31. The driver13drives the FET30at a duty ratio set so as to prevent the estimated current value I from exceeding a permissible current value or stops driving when the estimated current value I is equal to or more than the permissible current value.
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International Search Report of PCT/JP2005/014394, date of mailing Sep. 27, 2005.
Translation of International Preliminary Report on Patentability mailed Mar. 29, 2007 of International Application No. PCT/JP2005/014394.
Eguchi Hiroyuki
Shimizu Motohiro
Honda Motor Co. Ltd.
Riley Shawn
Westerman Hattori Daniels & Adrian LLP
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