Resources Contact Us Home
Power supply apparatus capable of detecting abnormality of current flowing through drive circuit

Image Number 7 for United States Patent #7355826.

A current detection unit starts sampling of a motor current at the timing when the motor current has exceeded a threshold value, and holds a maximum motor current value for each prescribed operation cycle. An abnormality determination unit determines whether the maximum motor current value is greater than the threshold value, and counts the number of times that the maximum motor current value continuously exceeds the threshold value. When the count value has reached at least 3, the abnormality determination unit generates and outputs a detection signal indicating abnormality in the motor current to a relay drive unit and a notification unit. The relay drive unit in receipt of the detection signal generates a signal to turn off the system relays. The notification unit generates and outputs a signal AL to display means outside the power supply apparatus.

  Recently Added Patents
Method and apparatus for detection of the remote origin fraction of radon present in a measuring site
Statistical identification of instances during reconciliation process
SONOS stack with split nitride memory layer
Polarity switching member of dot inversion system
Laser protection polymeric materials
Volume compensation within a photovoltaic device
Systems and methods for providing television signals using a network interface device
  Randomly Featured Patents
Tone display voltage generating device and tone display device including the same
Bending sensor for an implantable lead and a heart stimulator with a lead having such a sensor
Roller coaster vehicle
Easy-fill, easy-press conical bearing
Line laser beam production and its use in scanning densitometers
Method to form a recessed source drain on a trench side wall with a replacement gate technique
Method of and kit for protecting the integrity of refrigeration systems
Method for treating waste water used in alkali metal hydroxide manufacturing processes
Power supply providing ultrafast modulation of output voltage