During an ESD event, both D1 and D2 can conduct, but the voltage at VIN exceeds the power-supply-railvoltage by only two forward-biased diode voltage drops.
It analyses the rail transit DC traction power supply system voltage type frame protect device and railvoltage limited device matching problems that solve their adjusting value and time.
Such as aerospace, construction and decoration, port machinery, rail transportation, electric equipment, low voltage switch, dyeing and printing machinery, food machinery, ships and yachts.