G - Physics – 01 – R
Patent
G - Physics
01
R
320/12
G01R 19/165 (2006.01)
Patent
CA 1175897
ABSTRACT OF THE DISCLOSURE The present invention provides a battery condition indicator for use in a circuit comprising a DC power supply connected across the terminals of a nickel cadmium battery, comprising: (a) a branch connection to the positive side of the power supply; (b) a second branch leading to the negative side; (c) four transistor circuits arranged in parallel, the first three of which have their emitters connected with said positive branch, the fourth being reversed with its emitter connected with the negative branch; (d) the second transistor having its plate connected with the collector-to-green LED circuit of the first transistor; (e) a fourth transistor with a negative emitter circuit between the negative branch and the emitter; (f) a zener diode having a connection from the negative emitter circuit of the fourth diode through said zener diode with the base of the first transistor with a re- sistor between the zener diode and the base of said first transistor; (g) a shunt circuit around said resistor wherein the base of the third transistor is connected through a resistor to the connection leading from the zener diode to the base of the first transistor at a point between the zener diode and the resistor in said connection, the collector circuit of the third resistor being also connected to the connection between the zener diode and the base of the first transistor but joining said connection between the said resistor in said connection; (h) the said circuits being so arranged that a normal charging current path will put a negative bias on the base of the first transistor to light the green LED, thereby extinguishing the red, but lighting the red if the green is extinguished, and under normal voltage lighting the red by an absence of adequate negative voltage in the base of the first transistor, and the lighting of the green by the application of adequate negative voltage through the zener diode circuit to bias the first transistor, the green LED being extinguished when the charging voltage is above normal by the positive voltage from the collector of the third transistor offsetting the negative flow from the zener diode, but by reason of the resistor in the connection between the zener diode and the base of the first transmitter enabling the zener diode to continue to supply a negative bias to the base of the third diode.
437380
Lescovich Joseph E.
Salina Louis E.
Ga Industries Inc.
Marks & Clerk
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