Drive system and method for operating a drive system for an electronically operated vehicle

A drive system for an electrically operated vehicle, comprising:

• an electric drive unit operable as a motor and as a generator,
• a first power source circuit with a control device for controllably outputting power,
• a second chargeable and dischargeable power source circuit having at least one capacitor and which is connected in parallel to the drive unit,
• an electric intermediate circuit connected to the first and the second power source circuits and to the drive unit,
• a third chargeable and dischargeable power source circuit with at least one battery and which is connected to the intermediate circuit,
• a first detection device for detecting an electrical voltage of the intermediate circuit, which detection device is connected to the control device, and
• a second detection device for detecting a characteristic value of the vehicle speed and which is connected to the control device,
• wherein the control device sets a modifiable setpoint value for a voltage of the intermediate circuit as a function of the characteristic value of the vehicle speed and sets a power output of the first power source circuit as a function of the setpoint value and the voltage of the intermediate circuit, and
• further wherein the third power source circuit is connected to the intermediate circuit, whereby the third power source circuit feeds power into the intermediate circuit if a threshold value of the voltage of the intermediate circuit is reached or undershot.