Selection tool for PTC inrush current limiters

23-02-2021 | TDK | Test & Measurement

TDK Corporation offers a new, user-friendly tool to assist users in selecting the right PTC inrush current limiters for a variety of different power supply and converter topologies. The intuitive tool is available online and does not necessitate downloading. The selection process is split into four stages: After defining the circuit structure and the capacitor bank's total capacitance, the developer must then insert the charging voltage and the maximum ambient temperature of the PTC inrush current limiter. After this has been completed, the tool presents a list of suitable components, and if a parallel connection is needed, the quantity of components required is also displayed. The most significant key figures are also displayed, as well as links to service distributors that offer the PTC ICLs.


One notable advantage of these limiters is the fact that they are intrinsically safe. In the case of an internal short circuit in the device when it is switched on, this component promptly limits the current to non-critical levels. Moreover, this component assures gentle charging of the DC link capacitors.


As well as their use in converters and power supplies for industrial and household electronics, the limiters are also utilised in the field of e-mobility – such as in on-board charging circuits and for the charging and discharging of DC-link capacitors in hybrid and electric drives.

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