The power converter itself does not provide any electrical energy, but converts one form of electrical energy into another
A bold conjecture, generally refers to the power supply for power converter is to convert a form point to another form, itself has to consume some energy. For example, the commonly used home electrical transformer, is to convert 220VAC to DC.
Landlord is estimated to compare the chemical battery and ordinary AC/DC, DC/DC power comparison
Power supply is a general concept, which can provide the current device can be called power supply, battery power supply
