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
Sporting goal practice screen
Low latency interrupt collector
Information processing apparatus, method for controlling information processing apparatus, and storage medium
Cytokine receptors associated with myelogenous haematological proliferative disorders and uses thereof
Circuitry testing module and circuitry testing device
Method for manufacturing light emitting diodes
Hydroxylated amide skin moisturizer
  Randomly Featured Patents
Inkjet printer comprising MEMS temperature sensors
Low strain optical fiber coil
Methods for nucleic acid manipulation
User interface for a portion of a display screen
Method and apparatus for minimizing storage of common attachment files in an e-mail communications server
High voltage ground stud
Tubular headband mounted wet mop
Rotary engine
Intermediate spreadsheet structure
Plasma display device