This chapter describes how auxiliary supplies are derived and explains how to specify the equipment. Web microprocessor controlled, easy to setup, easy to operate, and easy to maintain single or three phase digital rectifier/chargers. Web the 110v dc battery charger circuit diagram begins with the power supply, which is typically a 12 vdc wall adapter or a monolithic dc/dc converter module. The electrical substation is the part of a power system in which the voltage is transformed from high to low or low to high for transmission,. Using a peak voltage detection point of 1.5 v/cell will.