Device and method for measuring the charge state of a nickel-cadmium accumulator
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 22, 1997
Issued Date -
N/A
app pub date -
Jul 17, 1995
filing date -
Nov 8, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The battery (3), which powers an apparatus (2), supplies an auxiliary circuit for a short time (5). A test and control component (6) of the device superimposes a low amplitude current interference .DELTA.i onto the discharge current (1). The interference signal frequency f is chosen acccording to the capacity and the discharge current of the battery (3). Processing of the frequency response of the battery (3) by the test and control component provides an indication of the combined impedence of the battery at that frequency. The value Z.sub.I =(.DELTA.V/.DELTA.I) sin (.DELTA..phi.) of the imaginary part of the impedence so measured, or advantageously the value of the quantity .GAMMA.=Z.sub.I.sup.-2 f.sup.-3/2 thereby indicates the state of charge of the battery.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully