Resources Contact Us Home
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
Providing multiple decode options for a system-on-chip (SoC) fabric
Simulating non power of two texture behavior
Process for the preparation of diene polymers of statistical vinylarene-diene copolymers
Method for manufacturing semiconductor element and semiconductor device, and deposition apparatus
Integrated advance copper fuse combined with ESD/over-voltage/reverse polarity protection
Method for producing male sterile plants using plant beclin 1/ATG6 expression
  Randomly Featured Patents
Multi-band antenna having a reflector
Packaging material
Skateboard fastening device
Method and apparatus for high data rate demodulation
Amphipathic polychelating compounds and methods of use
Hexa(meta-,para-carboxyphenyl)benzene compounds
Speaker porting for a communication device
Hydraulic valves
Wire cut electrical discharge machining apparatus
Unidirectional rotatory pedicle screw and spinal deformity correction device for correction of spinal deformity in growing children