An ultrasound generator , - having an input for a supply voltage (UV) 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 (US) at the output from the supply voltage (UV) 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 (US) applied to the coupling input onto a transducer voltage (UW) 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 (UW) and to radiate said ultrasound at said transducer output , wherein the generated ultrasound has a transmission power (PS) 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 (PP) and, when doing so, to select the pulse-pause ratio (PP) of the PWM signal on the basis of a characteristic (K) correlated with the transmission power (PS) of the ultrasound , such that the transmission power (PS) corresponds to a predefinable transmission target value (SS) independently of the value (W) of the supply voltage (UV), - wherein the characteristic (K) is the value (W) of the supply voltage (UV), and the control unit is arranged to select the pulse-pause ratio (PP) by the characteristic (K) being mapped onto the pulse-pause ratio (PP) according to a predefinable mapping rule and the transmission power (PS) thus corresponds to the transmission target value (SS). - having an input for a supply voltage (UV) 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 (US) at the output from the supply voltage (UV) 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 (US) applied to the coupling input onto a transducer voltage (UW) 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 (UW) and to radiate said ultrasound at said transducer output , wherein the generated ultrasound has a transmission power (PS) 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 (PP) and, when doing so, to select the pulse-pause ratio (PP) of the PWM signal on the basis of a characteristic (K) correlated with the transmission power (PS) of the ultrasound , such that the transmission power (PS) corresponds to a predefinable transmission target value (SS) independently of the value (W) of the supply voltage (UV), - wherein the characteristic (K) is the value (W) of the supply voltage (UV), and the control unit is arranged to select the pulse-pause ratio (PP) by the characteristic (K) being mapped onto the pulse-pause ratio (PP) according to a predefinable mapping rule and the transmission power (PS) thus corresponds to the transmission target value (SS). <EOS>