Method for modulating the boost converter operating mode of a push-pull converter having a low-voltage-side circuit, designed to convert a low-voltage-side applied DC voltage into a low-voltage-side AC voltage, having a first low-voltage-side switching device, a second low-voltage-side switching device and an inductor; a transformer having a low-voltage-side winding and a high-voltage-side winding, designed to receive the low-voltage-side AC voltage on the low-voltage-side winding and to produce a high-voltage-side AC voltage on the high-voltage-side winding; and a high-voltage-side circuit, designed as a full-bridge rectifier, in order to convert the high-voltage-side AC voltage into a high-voltage-side DC voltage, having a first and a second rectification element, which form a first half-bridge, and a third and a fourth rectification element, which form a second half-bridge; wherein at least the first or the fourth rectification element is in the form of a switching device and wherein at least the second or the third rectification element is in the form of a switching device; the method comprising the steps of: closing the first low-voltage-side switching device and opening the second low-voltage-side switching device to produce a first voltage across the transformer and to supply energy to the transformer and the inductor while simultaneously shorting the high-voltage-side winding via the first or the fourth rectification element during a first time period ([0,t1]) of a modulation cycle; opening the rectification element (21, 24) used for shorting the high-voltage-side winding to produce a high-voltage-side DC voltage during a second time period ([t1,t2]) of the modulation cycle; opening the first low-voltage-side switching device and closing the second low-voltage-side switching device to produce a second voltage across the transformer, which has the opposite polarity to the first voltage, while simultaneously shorting the high-voltage-side winding via the second or the third rectification element of the second half-bridge during a third time period ([t2,t3]) of the modulation cycle; and opening the rectification element (22, 23) used for shorting the high-voltage-side winding to produce a high-voltage-side DC voltage during a fourth time period ([t3,t4]) of the modulation cycle. a transformer having a low-voltage-side winding and a high-voltage-side winding, designed to receive the low-voltage-side AC voltage on the low-voltage-side winding and to produce a high-voltage-side AC voltage on the high-voltage-side winding; and a high-voltage-side circuit, designed as a full-bridge rectifier, in order to convert the high-voltage-side AC voltage into a high-voltage-side DC voltage, having a first and a second rectification element, which form a first half-bridge, and a third and a fourth rectification element, which form a second half-bridge; wherein at least the first or the fourth rectification element is in the form of a switching device and wherein at least the second or the third rectification element is in the form of a switching device; the method comprising the steps of: closing the first low-voltage-side switching device and opening the second low-voltage-side switching device to produce a first voltage across the transformer and to supply energy to the transformer and the inductor while simultaneously shorting the high-voltage-side winding via the first or the fourth rectification element during a first time period ([0,t1]) of a modulation cycle; opening the rectification element (21, 24) used for shorting the high-voltage-side winding to produce a high-voltage-side DC voltage during a second time period ([t1,t2]) of the modulation cycle; opening the first low-voltage-side switching device and closing the second low-voltage-side switching device to produce a second voltage across the transformer, which has the opposite polarity to the first voltage, while simultaneously shorting the high-voltage-side winding via the second or the third rectification element of the second half-bridge during a third time period ([t2,t3]) of the modulation cycle; and opening the rectification element (22, 23) used for shorting the high-voltage-side winding to produce a high-voltage-side DC voltage during a fourth time period ([t3,t4]) of the modulation cycle. closing the first low-voltage-side switching device and opening the second low-voltage-side switching device to produce a first voltage across the transformer and to supply energy to the transformer and the inductor while simultaneously shorting the high-voltage-side winding via the first or the fourth rectification element during a first time period ([0,t1]) of a modulation cycle; opening the rectification element (21, 24) used for shorting the high-voltage-side winding to produce a high-voltage-side DC voltage during a second time period ([t1,t2]) of the modulation cycle; opening the first low-voltage-side switching device and closing the second low-voltage-side switching device to produce a second voltage across the transformer, which has the opposite polarity to the first voltage, while simultaneously shorting the high-voltage-side winding via the second or the third rectification element of the second half-bridge during a third time period ([t2,t3]) of the modulation cycle; and opening the rectification element (22, 23) used for shorting the high-voltage-side winding to produce a high-voltage-side DC voltage during a fourth time period ([t3,t4]) of the modulation cycle.