The current flowing through the constant current diode is constant. The common circuit is as shown in the left figure. The E in the circuit is the power supply, HD is the constant current diode, and R1 is the on-board resistance. It is not difficult to see from the figure, when R. When the resistance value or the power supply voltage E changes, the voltage across the HD will change accordingly. Since the dynamic resistance of the constant current diode is a finite value, if the voltage of the constant current diode terminal changes too much, it will cause a change in the output current, which causes an error. The circuit shown below can eliminate this error.
In the figure on the right, when R2=R3=R4=R5, U2=UZ+U1, it can be seen that the voltage across the HD is always equal to the regulation value Uz of the Zener diode V1, thus eliminating R. A change in the resistance value or the power supply voltage E causes an error in the output current of the constant current diode.
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