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. 30, 1989
Filed:
Nov. 16, 1987
Robert H Munning Schmidt, Drachten, NL;
Geert J Bosscha, Drachten, NL;
U.S. Philips Corp., New York, NY (US);
Abstract
In a device where a load (R.sub.L) is powered by a battery (6) if a first detection device (100) detects that the expired discharge time measured by measurement means (40, 70) is equal to a first reference value stored in a memory (22), a first time measurement apparatus (40, 80) measures the time during which the load is powered by the battery. When the load is switched off and is not connected to the AC supply voltage via a power-supply circuit (1), the battery is discharged by a discharger (9). Second time-measurement apparatus (50, 80) measure the time during which the discharger is operative until a second detection device (13) detects a battery voltage at which the battery may be regarded as fully discharged. After comparison of the sum of the time intervals measured by the first and the second time-measurement apparatus with a second reference value stored in a memory (21), a correction device corrects the reference value stored in a memory (22) in such the way that during a next discharge the sum of the time intervals measured by the first and the second time-measurement apparatus is in better agreement with the second reference value.