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
Light irradiation element, image forming structure, and image forming apparatus
Probe for ultrasound diagnostic apparatus
Sensing device and electronic apparatus
Establishing a social network
Fuel-based injection control
Light-emitting device with a spacer at bottom surface
Image playback device and method and electronic camera with image playback function
  Randomly Featured Patents
Positional access using a b-tree
Drive line slip joint assembly
Method for controlling a feed rate of a printer, and printer employing same
Secondary beverage carton
Cardiac CT system and method for planning left atrial appendage isolation
Integrated circuit device for clock
Semiconductor device fabrication using a multiple exposure and block mask approach to reduce design rule violations
Warm up strategy for ethanol direct injection plus gasoline port fuel injection
Compound cell spin-torque magnetic random access memory
Device for making a firm, but releasable joint between a steering wheel and a locking bolt