The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 04, 2002
Filed:
May. 10, 2000
Brian K. Good, Greentown, IN (US);
Mark Wendell Gose, Kokomo, IN (US);
Gregg Nelson Francisco, Cicero, IN (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
An oscillator circuit includes an oscillation circuit producing a RAMP signal and at least two control signals STATE and STATE and a comparator comparing an externally produced error signal ERR with the RAMP signal. When the ERR signal is between minimum and maximum levels of the RAMP signal, the duty cycle of a PWMOUT signal of the oscillator circuit varies as a function of the difference between the ERR and RAMP signals, and preferably accounts for approximately 85% of the total period. When the ERR signal is less than or equal to the minimum level of the RAMP signal, the duty cycle of the PWMOUT signal is fixed at a first value which is preferably approximately 5% of the total duty cycle. When the ERR signal is greater than or equal to the maximum level of the RAMP signal, the duty cycle of the PWMOUT signal is fixed at a second value which is preferably approximately 90% of the total period. The three foregoing states of operation are established by the oscillation circuit as a function of the ratios of three capacitors relative to each other.