The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 31, 1999
Filed:
Apr. 22, 1998
Masato Sano, Sumoto, JP;
Sanyo Electric Co., Ltd., Osaka, JP;
Abstract
The current sensing circuit with automatic offset compensation is provided with a current sensing resistor, a difference amplifier which inputs this current sensing resistor voltage at its voltage measuring input terminal and inputs a reference voltage at its reference voltage terminal, and a measuring circuit which determines the current flowing in the current sensing resistor from the difference amplifier output voltage. The current sensing circuit adds a small bias voltage to the current sensing resistor voltage and inputs it to the voltage measuring input terminal to increase difference amplifier output voltage. The measuring circuit measures difference amplifier output voltage and compensates the reference voltage input to the difference amplifier reference voltage terminal to compensate difference amplifier output to 0V when current sensing resistor current is zero.