Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Power supply control circuit including overvoltage protection circuit










Image Number 4 for United States Patent #8116052.

A protection ability of a power supply control circuit is improved so as to protect an output transistor against a back electromotive voltage from a load, a dump surge voltage, and a positive spike surge voltage which has a smaller energy but is higher than the dump surge voltage. The power supply control circuit includes: an output MOS transistor (power semiconductor device) connected between a first power supply terminal and an output terminal; a load connected to the output terminal; a first dynamic clamping circuit for controlling a voltage difference between a first power supply line and the output terminal; and a first switch connected between the first dynamic clamping circuit and the output MOS transistor, in which a conductive state is determined according to a result of comparison between a reference voltage and a voltage at the output terminal. The power supply control circuit further includes a second dynamic clamping circuit for controlling a voltage difference between the first power supply terminal and the output terminal to protect the output MOS transistor. The second dynamic clamping circuit operates in response to application of a positive spike surge voltage which is higher than the dump surge voltage.








 
 
  Recently Added Patents
Electronic article surveillance system with metal detection capability and method therefor
Miniature communications gateway for head mounted display
Functional analysis of neurophysiological data
Systems and methods for recognizing information in objects using a mobile device
UV-curable low surface energy coatings
Electrostatic capacity type touch screen panel and method of manufacturing the same
Chip cards providing trusted time references
  Randomly Featured Patents
Device for untwisting the end of yarn in yarn splicing apparatus
Semiconductor integrated circuit
CMOS Device with silicided sources and drains and method
Injection mold for a magnetic tape cassette
Light emitting device having reflective surfaces extended from light incident surfaces
Pallet with supporting center feet
Method and apparatus for encoding and decoding digital information
Continuous feed and discharge flow through cassette loading apparatus and system
Apparatus for storing charge units
Mug with spoon holder