Are any dangerous voltages exposed on the surface of the converter?
In the United States, UL defines an “Unsafe” voltage as 60V, this is called the SELV (Safety Extra Low Voltage) limit. At input voltages of 0 to 60V, the highest voltage will be across the midbuss capacitors, this is an AC signal, operating at the switching frequency, with a maximum peak to peak amplitude of about 58V. Above a DC input of 60V the maximum voltage is the input voltage across the primary switching FETS, which is approximately Vin plus a few volts.
