What kind of composition structure does the potentiostat have?

The potentiostat as a whole is a negative feedback amplification - the output system, and the protected object (such as buried pipes) constitute a closed-loop regulation, through the reference electrode to measure the potential of the power-on point, as a sampling signal and control signal for comparison, to control and adjust the polarization current output, so that the power-on potential can be maintained at
the set control potential.

The potentiostat itself is a branch under a rectifier, with a constant potential, constant current function
.

Potentiopotentiostat refers to controlling the output
of the finisher using reference electrode feedback as a constant standard.

If there is a problem with the potentiostat, such as interference, damage to the reference electrode, etc.
, how does the potentiostat work? At this time, the constant current function, the constant current output, that is, the current output is unchanged, the voltage changes
.

The three-electrode potentiostat circuit is mainly composed of four parts:
operational amplifier, three-electrode system, sample solution, and feedback resistance.

Among them, the three-electrode system is composed
of a working electrode, a reference electrode and an auxiliary electrode.

The role of the working electrode is to electrochemical reaction of the solution to be measured under the condition of applied potential, so as to determine the current generated on the electrode; The auxiliary electrode and the working electrode form an conduction loop; The reference electrode serves as a reference electrode for the working and auxiliary electrodes
.

The feedback resistor converts the current generated by the operating electrode into a voltage to meet the requirements of
the back-end acquisition input.

The core of the potentiostat is the comparative amplifier, which is composed of a difference amplifier with deep negative feedback, generally used as an integrated operational amplifier, and its input is a control and reference (sampling) circuit, output to follow the amplification, control phase shift, oscillation and other circuits to generate trigger pulses, polarization power supply by thyristor rectifier circuit, by changing the conduction angle to achieve regulation output
.