The electrical circuits generate electro magnetic waves from the various components carrying current which affects the output of the circuit due to interference. There are many applications where the current requirement is low or high and when any technical fault comes in the circuit it leads to the unexpected flow of current. These challenges can be removed by an application called FIAM that is Filter Input Attenuator Module.
The FIAM with DC input is a front-end module that not only filters the EMI (Electro Magnetic Interferences) but also limits the pouring current and provides transient protection.
Now, let’s talk on the role of Charge Pump in the application. Below is the given diagram for FIAM:
Block Diagram of FIAM
A passive EMI filter is used in the circuit that provides sufficient attenuation of the EM waves when conducted in both common mode and differential mode. Before this filter there is a transient suppressor diode directly across the input. EMI filter is followed by a Charge Pump to drive the gate of MOSFET (in series positive rail) that accomplish surge protection and inrush current limitation. The charge pump restricts the time rate of change of the gate bias voltage at the start up or in the event of a voltage surge at the input. This is the point where the source terminal of FET follows the gate. This FET is fully enhanced and acts as a closed switch when operated normally. FET attenuates and absorbs the transients generated at the drain terminal which helps in creating the condition of virtual non-existence of the transients at the output of the FIAM.
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