与输出电压相比，输入电压是正电压还是负电压有关系？

与输出电压相比，输入电压是正电压还是负电压有关系？

由于隔离的DC/DC转换器在输入和输出之间没有电气连接，因此无论+Vin连接到正极电源而-Vin连接到接地，还是+Vin连接到接地而-Vin连接到负极电源。这在电信行业非常有用，例如，标准-48V电源可用于产生+5V输出（+Vin=接地，-Vin=-48V，+Vout=5V，-Vout=接地）。

请不要将此应用于非隔离开关调节器。

Does it matter of the input is positive or negative voltage compared to the output voltage?
 
As an isolated DC/DC converter has no electrical connection between the input and output, it does not matter if +Vin is connected to a positive supply and -Vin is connected to ground or if +Vin is connected to ground and -Vin is connected to a negative supply. This is useful in the telecommunications industry, for example, where a standard -48V supply can be used to generate a +5V output (+Vin = ground, -Vin = - 48V, +Vout = 5V, -Vout = ground).

Please do not apply this to a non-isolated switching regulator.