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:
Jun. 01, 2004
Filed:
Mar. 06, 2002
Seiko Epson Corporation, Tokyo, JP;
Abstract
A first control unit and second control unit are disposed to a portable data terminal having a heavy load group and light load group . The first control unit detects the output voltage of a secondary battery and controls power supply to the heavy load group by switching a first switch S . When the first control unit stops power supply to the heavy load group , it outputs a low level control signal CC to the second control unit . The load of driving the second control unit is designed to be smaller than the load of driving the first control unit . When the control signal CC is received, the second control unit starts detecting the output voltage of the secondary battery , and stops power supply to the switch light load group and first control unit if the output voltage is detected to drop to a preset threshold voltage.