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
Persistent luminescence nanoparticles used in the form of a diagnosis agent for in vivo optical imaging
Sparse data compression
Hand sign
Method and apparatus for secure transfer and playback of multimedia content
Device and method for unified codes
Ignition device in particular for an internal combustion engine, and method for manufacturing same
Semiconductor device and method of forming interconnect structure with conductive pads having expanded interconnect surface area for enhanced interconnection properties
  Randomly Featured Patents
Antiestrogenic glyceollins suppress human breast and ovarian carcinoma proliferation and tumorigenesis
Adaptive rate system and method for network communications
Apparatus for forming groups of packs
Plumbing enclosure
Drill grinding device
Digital signal demultiplexing device and multiplexing device
Flue tuning and emissions savings system
Self-cleaning hand washer
Inductively heated windshield wiper assembly