[ii] Patent Number: 4,607,208 [45] Date of Patent: Aug. 19, 1986
[54] BATTERY CHARGER
[75] Inventor: Stewart W. Vreeland, San Diego, Calif.
[73] Assignee: The United States of America as represented by the Secretary of the Navy, Washington, D.C.
[21] Appl. No.: 636,038
[22] Filed: Jul. 30, 1984
[51] Int. a." H02J 7/10
[52] U.S. CI 320/21; 320/32;
320/35; 320/37; 320/39
[58] Field of Search 320/20, 21, 22-24,
320/32, 35, 36, 37, 38, 39
[56] References Cited
U.S. PATENT DOCUMENTS
4,371,826 2/1983 Shelly 320/32 X
4,389,608 6/1983 Dahl et al 320/48 X
4,439,719 3/1984 Lambert et al 320/37 X
4,472,672 9/1984 Pacholok 320/32 X
4,554,500 11/1985 Sokira 320/21 X
4,564,800 1/1986 Jurjans 320/21 X
Primary Examiner—R. J. Hickey
Attorney, Agent, or Firm—Robert F. Beers; Robert W.
Adams
[57] ABSTRACT
A battery charger analyzer utilizing a down pulse configuration employs a number of power switching transistors driven from a pulse-width modulator in a control section which monitors and analyzes the battery temperature, charge condition, current provided, and length of time in the charge cycle, all of which affect the operation of the pulsewidth modulator and thereby the charge supplied to the battery. The charger analyzer supplies 95% of the battery charge at either of two selected charging rates.
20 Claims, 7 Drawing Figures
