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Linear Operation Determination for Galvanostat-Cell Systems

IP.com Disclosure Number: IPCOM000045909D
Original Publication Date: 1983-May-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Galwey, RK: AUTHOR

Abstract

A linear control system provides a means of dynamic protection for a galvanostat-cell system. The linear control system shown in the drawing utilizes a plurality of amplifiers, a comparator and a switch in combination with the electrochemical cell. This system detects nonlinear operation of the cell as well as protecting the cell from damage from such operation and from control loss.

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Linear Operation Determination for Galvanostat-Cell Systems

A linear control system provides a means of dynamic protection for a galvanostat-cell system. The linear control system shown in the drawing utilizes a plurality of amplifiers, a comparator and a switch in combination with the electrochemical cell.

This system detects nonlinear operation of the cell as well as protecting the cell from damage from such operation and from control loss.

The circuitry shown in the drawing is one implementation that can dynamically detect improper operation of a galvanostat when used with a cell l0. E/IN/ is a voltage proportional to the current to be driven through the cell l0, and E/REF /is the reference electrode potential. A buffer amplifier l2 provides current drive through resistor l4 to the cell l0. Amplifier l6 provides the galvanostatic function of voltage-- in, current-out. The voltage a cross resistor l4 is proportional to the cell l0 current and is equal to E/IN/ by this proportionality. Amplifier l8 measures the differential voltage across the resistor l4. This voltage is applied to the amplifier 20 whose output is equal to the difference of E/IN/ and the output of the amplifier l8. The output from amplifier 20 is applied to the window comparator 22. Under proper operating conditions, the output of amplifier 20 will be equal to zero. As amplifier l2 or amplifier l6 becomes nonlinear, the output of amplifier 20 will increase until the limits of the comparator 22 a...