plc analog output modules in the AC / DC conversion simple analysis

AC / DC conversion is to convert AC to DC , the power flow may be bidirectional power flow from the power source to the load is called a " rectifier " power flow from the load to return the power referred to as " active inverter ." AC / DC converter input is AC 50/60Hz , because to be  industrial automation plc rectified , filtered , and therefore relatively large size of the filter capacitor is essential, because while experiencing safety standards (such as UL, CCEE , etc. ) and EMC Directive restrictions ( such as IEC,, FCC, CSA), AC input side EMC filter must be added to meet safety standards and the use of components , thus limiting AC / DC power supply volume of miniaturization, in addition , due to the internal high-frequency , high-voltage , large plc module  current switching action, making solve EMC problems more difficult , plc analog output modules also installed on the internal high -density circuit design made ​​high demands, for the same reason , high voltage, high current switching power supply makes the job losses increase large , plc analog output modules limits the AC / DC converter modular process, and therefore must be used to optimize power system design approach to make it work efficiently to achieve a certain level of satisfaction .
AC / DC conversion circuit according to the  plc programmable intelligent controller connection method can be divided into half-wave circuit, a full-wave circuit . Press the power phases can be divided into single-phase , three-phase , multi-phase . Operation of the circuit can be divided into quadrants by a quadrant , two quadrant , three quadrants, four quadrants.