Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Coordinated load commutated inverter protection system










Image Number 19 for United States Patent #4475150.

A fault protective system for a load commutated inverter motor drive including an AC to DC source side converter coupled from an AC source to a DC to AC load side converter via a DC link circuit and wherein the load side converter supplies AC power of varying magnitude and frequency to the synchronous motor load. A pair of microcomputers interlinked by a common digital memory respectively control the inverters and interface with hardware type sensor means for detecting the occurrence of a plurality of different types of faults. Additionally, a number of stored instructional sets or programs are respectively included in both microcomputers to detect by software means another plurality of faults. The detection of a fault on either side of the link circuit is communicated to the respective computer which subsequently communicates with the other microcomputer to effect a coordinated protective action in response to thyristor cell failures, circuit failures, and abnormal operating conditions. Cell failure faluts include those instances where a thyristor cell actually fails due to an open or short circuit as well as those cases where a cell fails to commutate properly due to firing strategy problems. Cirucit failures include open and short circuits both in the supply line and the motor leads, while abnormal operating conditions involve such things as low line voltage or excessive motor voltage.








 
 
  Recently Added Patents
System and method for deposition in high aspect ratio magnetic writer heads
Area efficient through-hole connections
Enhanced telephony services
Epilation apparatus
Security arrangements for extended USB protocol stack of a USB host system
Facility to reuse paper
Enhanced claims damage estimation using aggregate display
  Randomly Featured Patents
Mechanism for generating random numbers following normal distribution
Radio communication system and method enabling transmission of packets to radio terminal in parallel via first and second radio base stations among radio stations, and radio terminal
Overhead hoist transport system
Tubular endoprosthesis for anatomical conduits
Shaft torsional vibration monitor for a multi-mass rotary shaft system
Multilayer wiring board, method of mounting components, and image pick-up device
Process for isomerizing and dehydrogenating aromatic compounds containing eight carbon atoms with different catalysts
Determining properties of magnetic elements
Calender arrangement and a deflection controlled roll and method of operating them
Multi-media recording system and method