Inrush Current Limiter For Led Lighting

The inrush current is due to the emc filter on the input and bulk capacitor on the boost circuit this is inherent to the led technology.

Inrush current limiter for led lighting. An ntc resistor is a so called. It appears for the few cycles of input waveform. Minimum resistance of the thermistor inrush current limiter 339 3v 17 0a 19 9ω. All switched mode power supplies have an inrush current rating including led drivers for a switched mode power supply the inrush depends on what phase the mains is at when the power switch makes contact.

Common inrush current limiters operate with an ntc resistor or a zero crossing switch. To increase however the number of switching power supplies per circuit breaker it is advisable to use a inrush current limiter. T50 is the time duration in which the inrush current pulse is equal to 50 of imax. The short term inrush current of some modern led drivers can be significantly.

If using 3 x 200w led strip drivers. So if we calculate 3 x 83 we reach 249a this is the inrush current that circuit breaker trip curve should be able to stand for powering 3 x 200w led drivers in parallel. The energy rating in joules of the thermistor inrush current limiter must be equal to or greater than the total energy of all led inrush current on the branch. It shows an example of inrush current imax and t50.

Led switching power supplies show very high inrush currents. The value of the inrush current is much higher than the steady state current of the circuit and this high current can damage the device or trigger the circuit breaker. 200w 240v primary input 0 83 amps x 100 worst case scenario for inrush current 83a. Inrush current limiters are available at mouser electronics.

The soft start function is where the voltage current to the leds is slowly ramped up at start up this avoids damaging the led especially in cold start up conditions rise time of the led current is often confused with ac input inrush time of the driver due to translation issues when converting from chinese to english. The pcl16a inrush peak current limiter is a device that safeguards against excessive inrush currents that would otherwise trip the circuit breaker causing potential damage to the switching devices. Mouser offers inventory pricing datasheets for inrush current limiters. Inrush current is the maximum current drawn by an electrical circuit at the time it s turned on.

If the problems listed above occur the inrush current of the led lighting is definitely too high. If it switches on at the positive or negative voltage peak then there will be a large positive or negative current spike the spike rises almost vertically then drops back. Ntc inrush current limiter. In this case the inrush current should be limited in a technical way.

Limiting the inrush current. This electronic inrush current limiter is an ideal solution to effectively reduce costs in led lighting technology.