An ultrasound generator, - having an input for a supply voltage in the form of a direct current voltage, - having a switching unit which comprises the input and an output and which is arranged to generate a switching voltage at the output from the supply voltage at the input, - having a coupling element which, by a coupling input thereof, is connected to the output and comprises a coupling output and which is arranged to map the switching voltage applied to the coupling input onto a transducer voltage at the coupling output, - having a transducer which, by a transducer input thereof, is connected to the coupling output and which comprises a transducer output and which is arranged to generate ultrasound at the transducer output from the transducer voltage and to radiate said ultrasound at said transducer output, wherein the generated ultrasound has a transmission power during operation, - wherein the switching unit contains a circuit which, in a series arrangement, comprises the input, the output and a switching element, and the switching unit contains a control unit, - wherein the control unit is arranged to actuate the switching element in a pulse-width modulation, Pulsweitenmodulation - PWM, mode with a PWM signal having a pulse-pause ratio and, when doing so, to select the pulse-pause ratio of the PWM signal on the basis of a characteristic correlated with the transmission power of the ultrasound, such that the transmission power corresponds to a predefinable transmission target value independently of the value of the supply voltage, - wherein the characteristic is the value of the supply voltage, and the control unit is arranged to select the pulse-pause ratio by the characteristic being mapped onto the pulse-pause ratio according to a predefinable mapping rule and the transmission power thus corresponds to the transmission target value. - having an input for a supply voltage in the form of a direct current voltage, - having a switching unit which comprises the input and an output and which is arranged to generate a switching voltage at the output from the supply voltage at the input, - having a coupling element which, by a coupling input thereof, is connected to the output and comprises a coupling output and which is arranged to map the switching voltage applied to the coupling input onto a transducer voltage at the coupling output, - having a transducer which, by a transducer input thereof, is connected to the coupling output and which comprises a transducer output and which is arranged to generate ultrasound at the transducer output from the transducer voltage and to radiate said ultrasound at said transducer output, wherein the generated ultrasound has a transmission power during operation, - wherein the switching unit contains a circuit which, in a series arrangement, comprises the input, the output and a switching element, and the switching unit contains a control unit, - wherein the control unit is arranged to actuate the switching element in a pulse-width modulation, Pulsweitenmodulation - PWM, mode with a PWM signal having a pulse-pause ratio and, when doing so, to select the pulse-pause ratio of the PWM signal on the basis of a characteristic correlated with the transmission power of the ultrasound, such that the transmission power corresponds to a predefinable transmission target value independently of the value of the supply voltage, - wherein the characteristic is the value of the supply voltage, and the control unit is arranged to select the pulse-pause ratio by the characteristic being mapped onto the pulse-pause ratio according to a predefinable mapping rule and the transmission power thus corresponds to the transmission target value.