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:
Apr. 22, 2003
Filed:
Jul. 13, 2001
Sony Corporation, , JP;
Abstract
To reduce errors and decrease loss, the detecting range of current is enlarged and the current is independently detectable. A rectified voltage and a rectified current are supplied from an input terminal. Resistors and are serially connected between the input and output terminals. A load is connected to the output terminal. Between an emitter and collector of the transistor are resistor and a constant current detecting circuit The transistor base is connected to a control circuit that controls the transistor switching operations. The constant current detecting circuit detects current from the voltage across resistor A current detecting circuit detects current from the voltage across resistor A signal is supplied to the control circuit when the constant current detecting circuit detects small current. The control circuit supplies a signal to the transistor base that increases transistor impedance.