A protection diode is used in a circuit so that current will not flow in the reverse direction in the circuit. For example if your power supply provides 12 v at 07 a of current you may wish to select a diode that has a reverse breakdown voltage of 15v and 1a of forward current.
A Dc Fault Protection Circuit For Audio Amplifiers
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Place Decoupling Capacitor Before Or After The Reverse
This helps to protect components in circuitry that can be damaged from reverse current.
Protection diode power supply. In some situations where the input voltage is higher than expected we always use an overvoltage protection or crowbar protection circuit. Overvoltage protection is a characteristic of a power supply system which somehow deals with the voltage across the load side when the input voltage exceeds the pre set value. If you have trouble finding a diode that suits your needs remove the term schottky from your search youll find more parts but lose up to 07 v across the diode.
By detecting the high voltage the circuit can fire the thyristor to place a short circuit or crowbar across the voltage rail to ensure it does not rise to high in voltage. Weve seen that a single diode is a surprisingly effective way to incorporate reverse polarity protection into a devices power supply circuitry. A protection diode is used to block this reverse current flow.
Using diode is cheap and good option but an ordinary diode gives a drop of 07v and a schottky diode will give a drop of 016 to 020 volts which is also not acceptable because my processor imx28 recommended operating power supply is 50v and minimum supply voltage is 475. A diode is a device that allows current to flow in through one direction but not the other. Another consideration is to protect the output on the secondary side of the power supply to minimize the electrical stress placed on the circuitry behind the power supply.
This is done in cases when it is known that the circuit is susceptible to transient voltages. Freewheeling diodes across inductive loads provide a path for release of stored inductor energy while voltage drops to zero customer application a dc power supply is connected to an inductive load. Because a diode only allows current to flow in one direction in a circuit but not the other it can protect components in a circuit that are sensitive to current that flows through them in the wrong direction.
The diode is typically rated for the full output current of the power supply it is protecting. Schottky diodes have lower forward voltage and consequently are generally a better choice than normal diodes. The load is being switched and high voltage transients in the load circuit are causing switch and power supply failures.
Adding to the diode drop there can be some more small voltage drops due to current flowing in wires tracks current monitor resistors output filter inductors switching transformer windings etc. The thyristor or scr silicon controlled rectifier can be used to provide overvoltage protection in a power supply circuit.
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