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:
Sep. 10, 1991
Filed:
Nov. 21, 1989
John J Dhyanchand, Rockford, IL (US);
Vietson M Nguyen, Rockford, IL (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
An inverter (100) in accordance with the present invention for producing an AC output potential from a filter (40) containing an inductance (42) through which current flows to a load (12) in accordance with the invention includes first and second switches (Q1 and Q2) in series between a pair of DC reference potentials with each switch having a conductive and a non-conductive state controlled by control signals applied to control terminals of the switch; first and second freewheeling diodes (46) coupled in parallel respectively between first and second terminals of the first and second switches; a current sensor (38) producing a load current signal proportional to current flowing through the inductance to the load; and a controller (102), responsive to an error signal proportional to a difference between an output voltage produced by the inverter applied to the load and a signal proportional to a desired regulated output voltage of the inverter, a current reference signal varying at a frequency equal to the AC output potential and the load current signal, for producing the control signals applied to the switches which turn on the switches only when current is flowing in the freewheeling diode parallel with the switch being turned on.