Column: Circuit drill
The impact of a reverse-voltage protection circuit on the circuit it protects
By Dr Sulaiman Algharbi Alsayed, Managing Director, Smart PCB Solutions
right polarity (forward voltage), the reverse-voltage protection circuit acts as a buffer, to ensure that the same input voltage is sent to the output and its load. When the supplied voltage is of
A
reverse polarity, the circuit’s output voltage falls to zero or very near it, safeguarding the load from reverse voltages.
Protection circuits Tere are many different circuit designs to guard against reverse voltage, one of which is shown in Figure 1. Here the power supply is connected to the circuit’s input (Vin
), with the protected circuit being attached to its output (Vout ). When
the polarity of the input voltage is correct, Vout
should (in theory) be identical to Vin To determine whether this is the case,
we set up an experiment: • Troughout the experiment the input voltage range was varied between -10Vdc and 10Vdc;
• All circuit component values were kept unchanged;
• Te circuit output was connected to a 10K load.
It’s worth noting that there are no significant changes in the output voltage if the load is changed.
08 May 2023
www.electronicsworld.co.uk Figure 2: Relation between the input and output voltages . Figure 1: A typical reverse-voltage protection circuit
reverse-voltage protection circuit is a standard safety precaution found in most electrical equipment.
When the supplied voltage is of the
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