Abstract: In a multi-resonance converter for converting a first DC voltage into a second DC voltage, wherein the output of a half-bridge comprising semiconductor switches is connected through a resonance capacitor to the primary winding of a transformer and the secondary winding of the transformer, together with rectifier elements, an output inductor and an output capacitor, forms a current output, it is proposed that a controller, which can be supplied which the voltage across the output capacitor and a reference voltage, should control the semiconductor switches alternately so that one of the semiconductor switches is respectively turned on at a predetermined time after the other semiconductor switch is turned off. Preferably, the frequency is controlled in an upper range of the drawn power while in a lower range of the drawn power, the mark-space ratio is controlled for selected respectively constant frequencies.

Abstract: In a multi-resonance converter for converting a first DC voltage into a second DC voltage, wherein the output of a half-bridge comprising semiconductor switches is connected through a resonance capacitor to the primary winding of a transformer and the secondary winding of the transformer, together with rectifier elements, an output inductor and an output capacitor, forms a current output, it is proposed that a controller, which can be supplied which the voltage across the output capacitor and a reference voltage, should control the semiconductor switches alternately so that one of the semiconductor switches is respectively turned on at a predetermined time after the other semiconductor switch is turned off. Preferably, the frequency is controlled in an upper range of the drawn power while in a lower range of the drawn power, the mark-space ratio is controlled for selected respectively constant frequencies.

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

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.