Contents
How to protect a DC Circuit from voltage overload?
When protecting at the power supply connections there are a number of schemes that can be utilized. The previously mentioned poly fuse or other type that is designed to trip at a voltage overload are workable but often have a kick-in delay time where the circuit is momentarily exposed to the high voltage condition.
Why is a power supply monitor called a crowbar?
The circuit that monitor and trips is called a “crowbar,” supposedly so named because it has the same effect as placing a metal crowbar across the output. Key to a properly designed crowbar is that it is both simple and that it functions independent of the supply itself, Figure 2.
How are I / O signals protected in a circuit?
If the protections are needed for I/O signals then the suggested zener diode circuits or other methods including TVS (transient voltage surpressor), clamping diodes are the useful ways toward protection. When protecting at the power supply connections there are a number of schemes that can be utilized.
Which is the best power supply protection circuit?
You know that the 3-pin regulator 7800 series gets very popular. I also like it. Because it is convenient and affordable. Although inside it has short circuit protection. But often, it would have been damaged when a short circuit. So, we should use a good power supply protection circuit.
What do you need to protect a power supply from over voltage?
What you need is a crowbar circuit to protect your circuit from overvoltage. This is one of a standard methods used in power supplies and devices as a protection for over voltage. A simple crowbar circuit is depicted below. Circuit above will protect your circuit/device at Vo by blowing the fuse in case of an over-voltage condition.
Can a switch be rated for both AC and DC?
In any application, it is good to know if your components are rated for AC or DC voltage. Switches are no exception, as they typically have both an AC and DC voltage rating. Arcing is an issue when it comes to switches since the circuit is being broken and the current cannot instantaneously drop to zero.
How can I reduce arcing of DC motor?
One may believe that buying a switch with a higher contact rating would be the solution to the problem. The best solution is to use an RC network to reduce the arcing of the switch. The photo above shows relay contacts after 100,000 cycles with no arc suppression.