How do you block reverse current flow?
The simplest protection against reversed-battery current is a series (a) or shunt (b) diode. As an improved battery-reversal measure, you can add a pnp transistor as a high-side switch between the battery and the load (Figure 2a).
Why do we need protection diode?
A protection diode used in any circuit that allows the flow of current in the forward direction, because the current will not flow in the reverse direction. It protects the components which are responsive to the flow of current through them in the wrong direction.
What is reverse blocking scheme?
Reverse blocking / Interlocking protection This scheme is achieved by installing an overcurrent relay on an incoming feeder circuit and also installing overcurrent relay in all out feeders as shown in Figure 9 below where the number 50 means instantaneous overcurrent.
How do diodes protect a circuit?
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 . A protection diode is connected in a circuit by placing the diode in series with the circuitry that is to be protected.
What does a protection diode do?
A protection diode (also called a safety diode) is a diode that is used in a circuit to protect the circuit from reverse voltage and current.
How does Zener diode work?
Zener diodes behave much the same as ordinary silicon diodes and start conducting at around 0.7V
How does the Zener diode protect the meter?
In meter protection: A zener diode can protect a meter from the excessive voltage applied to it . A parallel connection of zener with the meter causes excess current to pass through zener rather than a meter. Thereby protecting it from severe damage.