Contents
What is polarity protection?
Reverse polarity protection is an internal circuit that ensures that the device is not damaged if the power supply polarity is reversed. The reverse polarity protection circuit cuts off power to the sensitive electronic circuits in the transmitter or transducer.
What is a device used to reduce current flow?
In electronic circuits, resistors are used to reduce current flow, adjust signal levels, to divide voltages, bias active elements, and terminate transmission lines, among other uses.
How to protect your circuit with reverse polarity protection?
Reverse Polarity Protection with a Schottky Diode An easy way to mitigate both of the above disadvantages is to use a Schottky diode instead of a normal diode. This approach reduces voltage loss and power dissipation. I’m not sure how low Schottky diodes can go, but in some cases the forward voltage can be below 300 mV.
Which is better reverse polarity protection or Schottky diodes?
This higher reverse leakage current is a known disadvantage of Schottky diodes, though in this particular application the reverse current is still far lower than anything that would cause serious concern. So when it comes to reverse-polarity protection, Schottky diodes are definitely preferred.
What happens when you reverse the polarity of a power supply?
Bad things can happen when you reverse the polarity of your device’s power supply. Swapping the positive and negative power leads is probably the primary method of “letting the smoke out” of a shiny new PCB, and that is actually a better scenario than causing some sort of subtle damage that leads to perplexing or intermittent malfunctions.
Can a diode change the polarity of an applied voltage?
Yes, all you need is one diode. This really does work, but of course a more sophisticated solution could provide superior performance. The idea here is to put the diode in series with the supply line. If you’re not familiar with this technique, it might initially seem a bit strange: Can a diode change the polarity of an applied voltage?