Low cost battery sensing technique

Details Low cost battery sensing technique Low cost battery sensing technique

1997-08-18

1998-10-13

Tso, Edward

Electricity: battery or capacitor charging or discharging

Means to identify cell or battery type

320132, 320140, 320DIG29, H02J 702

Patent

active

058217304

ABSTRACT:
A low cost load sensing technique that is suitable for use in sensing batteries in a battery charging circuit is disclosed. The circuit is adapted to be utilized in conjunction with a power supply which may include a primary converter and a voltage feedback circuit. A transformer with a dual secondary winding is connected between the primary converter and the output terminals of the charging circuit. When no load or battery is present, a first feedback loop is utilized with both of the secondary transformer windings in series, which supplies a constant output voltage at the output terminals. When a load is present, a second feedback loop is utilized which includes one of the secondary windings to provide the voltage of the output terminals. A capacitor is connected in parallel with the other secondary winding. When a load is present, a step increase in voltage occurs across the capacitor due to the fact that the both secondary windings are in phase when a load is present. The voltage across the capacitor is used to drive an indicating circuit which provides an indication of a battery when the voltage across the capacitor exceeds a predetermined value. The indicating circuit may include a voltage divider and a Zener diode, configured to drive a transistor. The configuration of the indicating circuit as well as the feedback loops enable the circuit to detect a load, such as a battery, over a relatively wide dynamic range.

REFERENCES:
patent: 3217228 (1965-11-01), Jardine
patent: 3843918 (1974-10-01), Rhyne
patent: 3984799 (1976-10-01), Fletcher et al.
patent: 4460863 (1984-07-01), Conforti
patent: 5130634 (1992-07-01), Kasai
patent: 5150031 (1992-09-01), James et al.
patent: 5325040 (1994-06-01), Bogut et al.
patent: 5352970 (1994-10-01), Armstrong, II
patent: 5465039 (1995-11-01), Narita et al.
patent: 5576611 (1996-11-01), Yoshida

Affiliated with

Also associated with

Rating

Low cost battery sensing technique does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Low cost battery sensing technique, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low cost battery sensing technique will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-316232