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
Monitoring apparatus for monitoring communication configurations of client devices
Eye therapy system
System for hot-start amplification via a multiple emulsion
Resistive random access memory cell and resistive random access memory module
Playback device for stereoscopic viewing, integrated circuit, and program
Providing user interfaces and window previews for hosted applications
Method of making a CIG target by cold spraying
  Randomly Featured Patents
Electrodialysis including filled cell electrodialysis (Electrodeionization)
Cartridge for respiratory apparatus
Method and device for coding, decoding and transmitting information, using source-controlled channel decoding
Non-volatile semiconductor memory device and method of rewriting data stored in non-volatile semiconductor memory device
Energy storage device
Resealable label flap and base material
Isometric exercise ball
Call re-routing upon cell phone docking
Apparatus and method for preventing multimedia message retrieval in mobile communication system
Infrastructure for accessing a peer-to-peer network environment