Abstract: A power converter, comprising an input circuit having a single diode rectifier (D); and a switcher mode power supply IC (SMPS).

Abstract: Usually, power supplies are not capable of switching off part of the outputs of a main power supply during stand-by. Due to this, stand-by power supplies are used in addition to operation power supplies. Consistent with an example embodiment, a forward converter is provided, including switches in the rectifier circuit thereof. Due to this, the rectifier circuits may be selectively switched on and off. Advantageously, this may allow that the main outputs of such a forward converter are switched off while on stand-by.

Abstract: A power converter comprising: a rectifier arrangement (D1-D4) having inputs coupled to AC power supply terminals; a pair of series-connected capacitors (C1, C2) coupled across output terminals of the rectifier arrangement; a switch (S1) coupled between one of said AC power supply terminals and a midpoint of the pair of series-connected capacitors, the switch being open if a first AC voltage is applied to the AC power terminals, and the switch being closed if a second AC voltage is applied to the AC power terminals, the first AC voltage exceeding the second AC voltage; and an overvoltage protection circuit (D5, R30, D6) coupled between at least one of the inputs of the rectifier arrangement and the midpoint of the pair of series-connected capacitors.

Abstract: A power supply circuit and a switched-mode power supply with a power supply input circuit are proposed. Known power supply circuits comprise a rectifier supplied with an AC voltage and a first smoothing capacitor. To provide a circuit which is suitable for operation over a wide voltage range, it is proposed that at least a second capacitor be provided which is connected by a switching element to the load terminals so that, when the voltage at the load terminals drops below a voltage threshold, the second capacitor is connected to the load terminals. Further embodiments comprise an apparatus for charging the second capacitor, which is preferably equipped with an apparatus for limiting the voltage at the second capacitor to a charging threshold. By suitable selection of the charging threshold, a capacitor may be used as the second capacitor which, despite a high capacitance value, exhibits a small structural size and low component costs due to the relatively low dielectric strength.

Abstract: A power supply circuit and a switched-mode power supply with a power supply input circuit are proposed. Known power supply circuits comprise a rectifier supplied with an AC voltage and a first smoothing capacitor. To provide a circuit which is suitable for operation over a wide voltage range, it is proposed that at least a second capacitor be provided which is connected by a switching element to the load terminals so that, when the voltage at the load terminals drops below a voltage threshold, the second capacitor is connected to the load terminals. Further embodiments comprise an apparatus for charging the second capacitor, which is preferably equipped with an apparatus for limiting the voltage at the second capacitor to a charging threshold. By suitable selection of the charging threshold, a capacitor may be used as the second capacitor which, despite a high capacitance value, exhibits a small structural size and low component costs due to the relatively low dielectric strength.

Abstract: DC/DC conversion circuit (1), includes a transformer (2) having a primary winding (3), a secondary winding (4), and an auxiliary winding (5); a switching transistor (T), including a series circuit with the primary winding (3) between first and second direct current input terminals (6; 7); a start circuit (R1, C1) connected to a control electrode of the switching transistor (T) for switching the switching transistor (T) on by powering the direct current input terminals (6; 7); a control transistor connected to the control electrode of the switching transistor (T) for switching off the switching transistor (T) in dependence on a current flowing through the series circuit during operation.

Abstract: DC/DC conversion circuit (1), comprising a transformer (2) having a primary winding (3), a secondary winding (4), and an auxiliary winding (5); a switching transistor (T), comprising a series circuit with the primary winding (3) between first and second direct current input terminals (6; 7); a start circuit (R1, C1) connected to a control electrode of the switching transistor (T) for switching the switching transistor (T) on by powering the direct current input terminals (6; 7); a control transistor connected to the control electrode of the switching transistor (T) for switching off the switching transistor (T) in dependence on a current flowing through the series circuit during operation.