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:
Mar. 04, 2003
Filed:
Nov. 09, 2000
Zhenyu Yu, Sugarland, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
In a pulse width modulation controlled three-phase voltage-source inverter having three legs, each leg including two transistors coupled serially between the terminals of a power source and providing a respective drive output, each leg further including a shunt resistor between one of the two transistors and one of the terminals, in which control pulses are applied to each leg during a sequence of pulse periods, and the inverter has a neutral current, a method for determining the phase current for each phase. The method includes the following steps. First, it is determined which two legs have the longest on time for the lower power transistors. The current through the shunt resistors for the determined legs is determined, to obtain a value representative of the phase current for the legs. Finally, the phase current for the leg not sampled during the sector is derived by subtracting the determined phase currents from the neutral current.