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
Configurable logic cells
Partial response decision feedback equalizer with distributed control
Press nut
Target trading system and method
Synergistic compositions for the treatment of topical viral infections
Multi-carrier operation for wireless systems
Electric vehicle charging station parking meter systems
  Randomly Featured Patents
Linear movement device and lubricant supplying device used therefor
Support mechanism of steering system
Engine cleaning additives for diesel fuel
Pixel current driver for organic light emitting diode displays
Valve arrangement
Image generating method and apparatus
Portable electronic apparatus
Method for sealing a space between two sealing surfaces and a sealing device for carrying the method into effect
Combination hand truck, stepladder and basket carrier
Memory system with data line switching scheme