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Why freewheeling diode is used in RL load?
A Flyback diode is also called as freewheeling diode. Here catch diode is used to eliminate flyback, when the abrupt voltage spike is witnessed across the inductive load when the supply current abruptly reduced. It helps the circuit from damaging.
What is the main function of freewheeling diode?
The main purpose of freewheeling or flyback diode is to free wheel the stored energy in inductor by providing a short circuit path. This is necessary else a sudden decay in circuit current will give rise to high voltage across the switch contacts and diode.
When do I need a higher diode rating?
However, if the load current is more than 1A, then a diode with a higher current rating is required. The load current must not exceed the continuous current diode rating. The same can be considered for the supply current. If the design requires a 3A power supply, the diode should be able to handle 3A of current.
Is it safe to use 100 volts in a diode?
These will be your maximum ratings. The diode you use can exceed the maximum ratings if you cannot find one that’s smaller than it. For example, if your maximum circuit voltage is 15 and the smallest diode value you can find in the catalog is 100 volts, it’s perfectly safe to go with 100.
How do you write down the voltage of a diode?
Write the voltage value down. Multiply the voltage value by 1.25 and write it down. Do the same for the current value. These will be your minimum ratings. Multiply the voltage value by 2.5 and write it down, and do the same for current. These will be your maximum ratings.
How to choose a fly back diode for a relay?
Here R is the resistance of the fly-back diode in conduction, I is the current flowing through the fly-back diode and L is the inductance supplying the current. If we solve for the power, something very interesting happens…