Switched-mode power supply with low power loss standby operation

摘要

A switched-mode power supply includes a circuit device with which a primary side is fed by a significantly reduced rectified voltage derived from the AC mains power supply voltage, during a standby operating mode. A phase gating control configuration, a capacitive voltage divider or a step-down controller are preferably used therefor. Power consumption in the standby operating mode is reduced approximately in proportion to the square of the primary-voltage reduction factor.