Power supply for an x-ray generator system

Power supply for generating a high output voltage for supplying an X-ray generator system with at least one X-ray source,

• comprising at least a first voltage source for providing a first voltage level a second voltage source for providing a second voltage level, which voltage sources are connected in a cascade in order to generate the high output voltage which comprises at least a first high output voltage level which is at least substantially equal to the first voltage level, and a second high output voltage level which is at least substantially equal to the cascaded first and second voltage levels and a switch for switching a switchable output terminal of the lower supply between the first high output voltage level and the second high output voltage level during an X-ray scanning operation.