Fujitsu Technology Solutions Intellectual Property Gmbh

Robert Ruef

Peter Busch

An energy-saving circuit for a network-powered device (PD) having a converter circuit that produces an operating voltage (V) for the device (PD) from a supply voltage (V) 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.

Energy-saving circuit for a network-powered device, network arrangement and energy-saving method

A switched-mode power supply unit includes a mains input connecting the power supply to a primary supply voltage; an input circuit including a shared electrical path connected to the mains input and including a first mains filter, a first electrical path, connected in series with the shared electrical path, including a second mains filter, a second electrical path connected in series with the shared electrical path and connected in parallel with the first electrical path, and a first switching element that opens the first electrical path; a supply output that provides a filtered primary supply voltage; a switched-mode converter coupled to the supply output that converts the filtered primary supply voltage to a secondary supply voltage; and a control circuit that selectively switches the power supply unit to a first mode of operation with a high power output or a second mode of operation with a reduced power output.

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Friedberg, Germany

Robert Ruef