Hybrid drive of a hybrid vehicle

A hybrid drive of a hybrid vehicle, comprising:

• an internal combustion engine, at least one electrical machine and an electrical energy storage means which can be discharged to a relatively great extent when the at least one electrical machine is operated as a motor, and can be charged to a relatively great extent when the at least one electrical machine is operated as a generator, with the at least one electrical machine having an associated converter coupled to the respective electrical machine by a plug connection, and the electrical energy storage means having an associated converter coupled to the respective converter of the at least one electrical machine by a plug connection, the plug connections being connected in at least one high-voltage circuit and in a protective circuit, with the plug connections being automatically disconnected from the high voltage when the protective circuit is interrupted, the at least one high-voltage circuit comprises a high-voltage switch, the high-voltage switch only being closed and a high voltage only being provided to the plug connections when the protective circuit is closed, and with the high-voltage switch automatically opening and automatically disconnecting the high voltage from the plug connections when the protective circuit is interrupted, and a hybrid management system controller coupled to the plug connection, that couples the converter of the electrical energy storage means to the converter of the at least one electrical machine via at least one circuit breaker and an on-board electrical system controller, wherein a signal for closing the high-voltage switch can be provided to said high-voltage switch by said hybrid management system controller when the protective circuit is closed.