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When do I use active inrush current limiting?
While the benefits of active inrush current limiting have the most advantages in applications with power ratings higher than 500 watts, active inrush current limiting may be needed to help improve performance for applications with lower power levels. The most significant consideration is if the cost is worth the outcome.
What kind of resistor is used in inrush current limitation circuit?
In such applications, the active inrush current limitation circuit can employ a power resistor such as a NTC thermistor or a PTC thermistor as the ICL component depending on various requirements.
How are NTC thermistors used for inrush current limiting?
It is called an inrush current, and without protection, it may destroy a semiconductor device or have a harmful effect on the service life of a smoothing capacitor. NTC thermistors are used as ICLs (inrush current limiters) to protect circuits of electrical and electronic devices against inrush currents easily and effectively.
What causes an inrush current in a circuit?
Typically, these inrush currents last for less than 10 ms but still they may cause some circuit breakers to engage. Inrush current is caused by the charging of capacitors in the power supplies of the LED drivers or because magnetic flux hasnot yet built up in the transformer in the power supply.
What happens if the inrush current is too big?
If the inrush current is too large (where the power supply sunk too much energy in a short period of time), components in the power supply, such as fuse and rectifier diodes, might be damaged.
How do I reduce the inrush current in a DC BUS?
However, when the DC bus needs power, the capacitor can fed the power back to the DC bus through diode. The other is to use an active switch with soft start circuit to limit the inrush current, as shown in Figure 1.2.
What is the input voltage for an inrush?
Input voltage: 24V. Inrush Current: 3X steady state current. Duration of Inrush: 200ms. This calculation is performed in three steps because horsepower must be converted to watts before proceeding. This calculation is performed to determine the energy rating that will be needed.