Novel techniques of the reduction of standby power consumption for multiple output converters

Recently, the reduction of a standby power consumption is significantly issued in the electronic and electrical industry for the conservation of environment. In the case of a switched mode power supply (SMPS), it is demanded high efficiency at extremely low load conditions by consumers. However, it is very different from high efficiency techniques at full load conditions. In addition, many SMPSs are designed as a multi-output circuit for various loads because of the cost down. This circuit is difficult to implement both the high efficiency and good cross regulation performance, simultaneously. In this paper, novel secondary side post regulator (SSPR), current mode control method, and power sequence control technique are proposed to reduce standby power consumption and to improve the cross regulation performance of the multi-output SMPSs which consist of a single or multiple converter. The proposed methods are analyzed by their operational principles and optimal designs verified by experimental results with 110 W and 270 W SMPSs.