![]() In idle state consider, the circuit draws 1mA of current, in a normal working state the circuit draws 500mA of current and in the maximum working state it can draw 1000mA or 1A of current. Let’s assume a circuit that has three states, that is idle state, normal working state, and maximum working state. Since this phenomenon is more with AC loads, AC Inrush current limiter is more used than its DC counterpart.Įach and every circuit draws current from a source depending on the state of the circuit. Inrush current can also be called as Input surge current or Switch-on surge current based on convenience. Even though the value of inrush current is very high it occurs only for a few milliseconds or microseconds hence cannot be noticed without a meter. This behavior can be well observed in AC inductive loads like Transformers and Motors, where the inrush current value will normally be twenty or thirty times more than the nominal values. By definition, it can be defined as the maximum instantaneous input current drawn by an electrical device when it is turned on. ![]() So, let’s get started.Īs the name suggests the term “inrush current” indicates that when a device is turned on during the initial stage a huge amount of current rushes into the circuit. Then we will discuss the different types of circuit design that can be used to protect inrush current and finally conclude with some tips to protect your device against inrush current. We will first understand what inrush current is and the reason why it is generated. We previously discussed Inrush current, in this article we will discuss how to design an inrush current limiter circuits, to protect your Power supply designs from inrush currents. This is why designers include many types of Protection circuits in their design, we have already covered a lot of popular protection circuits namely This is particularly true for all power supply units like AC-DC Converters, or SMPS Circuits because they are connected directly to the AC mains and a varying load which makes them susceptible to overvoltages, voltage spikes, overloading, etc. The durability and dependability of an electronic circuit are highly dependent on how well it is designed considering all odds, which could practically occur when the product is actually in use.
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