Thomas Durbaum has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A multimode switched-mode power supply operates in a first control mode when the output power supplied is lower than a predetermined value, and in a second control mode when the output power supplied is higher than said predetermined value. The switched-mode power supply comprises a series arrangement of a switch (S1) and an inductor (L; Lp), the series arrangement being coupled to receive a DC input voltage (Vin). A control circuit (CC) controls the on and/or off times of the switch (S1) to generate a periodical inductor current (Ip) in the inductor (L; Lp). In the first control mode, a peak value of the inductor current (Ip) is substantially constant, independent of the power supplied. The substantially constant peak value is substantially equal to a peak value of the inductor current (Ip) at an instant when the second control mode is altered into the first control mode.
Abstract: A switched mode power supply includes a transformer having a primary winding and a secondary winding. A primary current flows through the primary winding during a first time period and a secondary current flows through the secondary winding during a second time period. A first switching device is connected in series to the primary winding, and a second switching device is connected in series to the secondary winding. In addition, the power supply includes primary and secondary control units. The secondary-side control unit switches the second switching device to control the power supply output by changing the energy returning back to the transformer during the second period of time. The primary-side control unit switches the first switching device to limit the supplied energy supplied by the transformer during the first period of time toward the input of the switched mode power to a predetermined value.
Abstract: A switched-mode power supply includes a transformer (L.sub.p, N), having its primary winding arranged to receive electric energy from an energy source (U.sub.in) in periodically recurring time intervals (t0 to t1), and having at least one secondary winding enabling the energy to be taken from the transformer (L.sub.p, N), and to be applied to a storage inductance (L.sub.o) and a load impedance (C.sub.o, R.sub.L) by a rectifier arrangement (D1 to D4). An improved efficiency is obtained with a circuit of low complexity in that the rectifier arrangement (D1 to D4) includes three current paths, of which a first current path is adapted to supply energy to the storage inductance (L.sub.o) and to the load impedance (C.sub.o, R.sub.L) during the time intervals (t0-t1), a second current path is adapted to demagnetize the transformer (L.sub.p, N) via its secondary winding and the load impedance (C.sub.o, R.sub.L), and the third current path is adapted to demagnetize the storage inductance (L.sub.
Abstract: A circuit arrangement for generating at least a DC output voltage (at 18, 19) from an at least substantially sine-shaped AC input voltage (at 2, 3) of a first frequency by a first rectifier arrangement (1) to which the AC input voltage can be applied (at 2, 3) and which has a DC output (4, 5) from which a rectified voltage is obtainable, a first inductance (6), a second rectifier arrangement (7) and a first filter capacitance (8) which, in this order, constitute a series arrangement connected parallel to the DC output (4, 5), a switched-mode power supply (9) having two input terminals (10, 11) with which it is arranged parallel to the first filter capacitance (8) and between which it includes a series arrangement of a second inductance (12) and a switching device (13) which is alternately switchable in the conducting state and in the blocked state at a second frequency and from which the DC output voltage(s) is (are) obtainable (at 18, 19), as well as a first control capacitance (23) by which the junction poi