Flex Power Modules introduces DC/DC converter with ultra-wide input voltage range for railway applications Flex Power Modules announces the PKJ7200W, a series of EN50155-compliant DC/DC converter modules for railway rolling stock equipment. Provided in a half-brick format, the PKJ7200W delivers up to 200 W output power, with an ultra-wide input voltage range of 14 V to 160 V. Equipment for use in railway rolling stock must meet a wide range of standard input voltages, which varies between countries. These voltages are defined by the EN50155 standard, which specifies the various nominal voltages in use, as well as variations due to voltage spikes and dips.