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:
May. 28, 2013
Filed:
Feb. 23, 2012
Jun Miyanoiri, Chiba, JP;
Jun Miyanoiri, Chiba, JP;
Seiko Instruments Inc., Chiba, JP;
Abstract
Provided is a power supply switching circuit with a smaller circuit scale. When a detector () detects that a voltage (V) as an input power supply voltage is higher than a detection voltage (VDET), a control circuit () operates with a voltage (V) output from a diode OR circuit (), supplies a voltage (V) as an input power supply voltage to a gate of a PMOS transistor (), supplies a voltage (V) to a gate of a PMOS transistor (), and supplies a ground voltage to a gate of a PMOS transistor (). Then, the PMOS transistors (and) are turned OFF and the PMOS transistor () is turned ON. In this case, the voltage Vof a first terminal (T) is output from a third terminal (T) as the voltage (V), which is an output power supply voltage.