Chokes with protection class IP66 for inverters

Because of their degree of protection IP66 these chokes can be fitted outside the inverters, which means that the heat generated by the choke is not discharged inside the inverter. This results in a lower internal inverter temperature, which removes the need for cooling fans, saving both energy and installation space. Placing the choke outside the inverter has the further advantage of reducing the inverter’s overall dimensions, which further cuts space and energy demand.

For the choke itself external mounting has the benefit of allowing it to be designed for lower ambient temperatures. While inverters, for example in railway applications, can have an internal temperature of 70 to 80 °C, the outside temperature to which underfloor-mounted electronics are exposed is unlikely to exceed about 40 °C. SMP has developed chokes for external mounting even for use on offshore oil platforms. Their special protective paint coating protects these components from direct sunlight, sea water, rain and corrosive gasses.

To simplify mounting outside the inverters, SMP provides the chokes with special mounting fixtures. The choke and the mounting plate are fitted on the device’s outside and the connecting cables pass through a sealed opening.

For use in power electronics, power generation, and instrumentation and control, SMP supplies chokes and filters for frequencies up to 200 kHz and current ratings up to 1000 amperes. Depending on their application, they are constructed either as single-conductor chokes for high-current applications, individual chokes, choke modules or LC filters. SMP’s inductive components offer a high energy storage capacity at low volume, reduced losses, good EMC characteristics and a cost-conscious design. All SMP components are manufactured to customer specifications using in-house developed powder composites. To allow for a wide range of requirements, components can be made to all common standards. All products are RoHS- and WEEE-compliant and the materials used are UL-listed.