Patent ID: 9515507
Filing Date: 2016-12-06
CPC Classification: H02J,H04L

Claim Text:
1. An energy-saving circuit for a network-powered device having a converter circuit that recognizes and responds to detection pulses which can be provided by a power sourcing equipment via a network and produces an operating voltage (V OUT ) for the network-powered device from a supply voltage (V PSE ) which can be provided by the power sourcing equipment via the network, comprising: 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 the network-powered device on and/or off and are received from a secondary side of the network-powered device, wherein the at least one control circuit, in a switched-off state of the network-powered device, opens the at least one switching element to break the at least one electrical connection between the network and the converter circuit and, in a switched-on state of the network-powered device, closes the at least one switching element to close the at least one electrical connection between the network and the converter circuit such that, in the switched-on state of the network-powered device, the converter circuit can react to a received detection pulse and a monitoring circuit of the power sourcing equipment can recognize that the network-powered device is connected to the power sourcing equipment, and at least one energy buffer connected on a network side of the at least one switching element, the energy buffer configured to store energy from voltage pulses provided from the power sourcing equipment via the network at regular intervals to constantly supply the control circuit with an operating power in the switched off state, wherein the energy saving circuit has an internal resistance above a predetermined limit such that the monitoring circuit of the power sourcing equipment does not recognize that the network-powered device is connected to the power sourcing equipment when the network-powered device is in the switched-off state.