Controlled-potential bias circuit for electrochemical cells
First Claim
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1. A bias circuit for an electrochemical cell including anode, cathode and reference terminals, said bias circuit comprising an amplifier having an output electrically connected to the anode of the cell, a positive input connected to the reference terminal, and a negative input;
- and voltage setting means connected to the negative input of the amplifier for establishing a predetermined voltage difference, said voltage setting means being effective for establishing a voltage drop defined by the voltage difference between said output and said negative input of said amplifier, whereby the predetermined voltage difference is independent of the current variation between the anode and cathode terminals of the electochemical cell.
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Abstract
A bias circuit (13) for an electrochemical fuel cell (15) serving for example as a carbon monoxide or hydrogen sulfide detector, including an operational amplifier tied to the anode and reference terminals (21,23) of the fuel cell (15), and a zener diode (50) arrangement for maintaining a predetermined voltage drop between the output and negative inputs of the operational amplifier (33).
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7 Claims
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1. A bias circuit for an electrochemical cell including anode, cathode and reference terminals, said bias circuit comprising an amplifier having an output electrically connected to the anode of the cell, a positive input connected to the reference terminal, and a negative input;
- and voltage setting means connected to the negative input of the amplifier for establishing a predetermined voltage difference, said voltage setting means being effective for establishing a voltage drop defined by the voltage difference between said output and said negative input of said amplifier, whereby the predetermined voltage difference is independent of the current variation between the anode and cathode terminals of the electochemical cell.
- View Dependent Claims (2, 3, 4, 5, 6, 7)
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