Abstract: A method for operating a DC-DC converter (300) which contains a buck-boost converter (10) with an inductor (L) and a plurality of switching elements (S1-S4), comprises measuring a current (I) flowing through the inductor (L) and performing the following method steps: a) comparing the current with a first threshold current value (Ival), b) setting the buck-boost converter into a first switching state (BOOST ON) at the beginning of a switching cycle if the current is below the first threshold current value, or setting the buck-boost converter into a second switching state (BOOST OFF, BUCK ON) at the beginning of the switching cycle if the current is not below the first threshold current value, c) if the buck-boost converter is operated in the first switching state, comparing the current with the first threshold current value (Ival) and setting the buck-boost converter into the second switching state as soon as the current reaches the first threshold current value, d) if the buck-boost converter is operated in t

Abstract: An electronic power switching circuit comprising a primary circuit with two conducting rails having a first end and a second end, wherein the conducting rails at the first end are configured to be connected to the two phases of an external AC power supply and a secondary circuit with two conducting rails having a first end and a second end, wherein the conducting rails at the first end are connected to the conducting rails at the second end of the primary circuit via electromechanical relays and interposed between the conducting rails and the conducting rails, respectively, wherein said relays are electrically actuated via a control unit, where the control unit controls the switching of the relays depending on the zero crossing time of the load current and/or the power supply voltage.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.