Energy saving circuit, trunk configuration and energy saving method for mains powered equipment

摘要

An energy-saving circuit for a network-powered device (PD) having a converter circuit that produces an operating voltage (VOUT) for the device (PD) from a supply voltage (VPSE) which can be provided via a includes at least one switching element that breaks at least one electrical connection between the network and the converter circuit, at least one control circuit that actuates the at least one switching element on the basis of control signals that switch on and/or off and are received from the device, and at least one energy buffer that stores energy from voltage pulses, provided via the network, to supply the control circuit with operating power.