Square D Company

Metallic Power, Inc.

Charles M Holmes

Stuart I Smedley

Kenneth D Vail

A system for measuring available energy in a metal fuel cell is provided. The system comprises first componentry for measuring an electrical property of a mixture formed from one or more reaction products dissolved in a reaction medium. The electrical property may be such as to bear a known relationship with the concentration of the one or more reaction products. Using this known relationship, second componentry estimates the concentration of the one or more reaction products, and, responsive thereto, determines the available energy in the fuel cell.

Method of and system for determining the remaining energy in a metal fuel cell

An AC power amplifier (50) with a pair of push-pull transistors (Q1, Q2) driving opposite sides (36, 38) of the primary winding of an output transformer (T1) controlled by a pair of variable duty cycle, pulse width modulated width trains (A, B) generated on the output of a pulse width modulator (26) controlled, in turn, through means of a wave shaping feedback system to cause the AC output at the secondary winding (20) to track the output of a precision reference sine wave oscillator (12) and through means of another feedback system for automatic DC compensation including a pair of CMOS analog switches respectively driven by the two pulse width modulated pulse trains (A on 28, B on 30) to produce a pair of feedback signals. A junction (58) couples the pair of feedback signals to form a composite feedback signal and an error amplifier (14) also used in the wave shaping feedback system, responds to the composite feedback signal to balance the duty cycles of the pair of drive signals to reduce the introduction of DC to the output transformer (T1).

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Escondido, CA, United States of America

Charles M Holmes