ER11010 / S working principle: the principle of charging module block diagram shown in Figure 2-25, transform single-phase active PFC and DC / DC power components. There two power than the input EMI filter, auxiliary power supply, and input and output detection protection circuit. The previous single-phase active PFC for AC input rectifier filter and correction of the input current, the input circuit of the power factor of 0.99, to meet DL/T781-2001 input current harmonic standards. After the DC / DC circuit by the DC / DC converter and its control circuit is rectified and filtered output EMI part to achieve the previous level rectifier voltage into a stable DC voltage output power operating system requirements. Auxiliary power input single-phase active PFC, before the DC / DC converter, the DC output of the PFC control circuit required each power supply. Input detection circuit input over voltage detection. Detection protection circuit of the DC / DC output voltage and current detection, detection of the heat sink temperature, all these signals for DC / DC control and protection.