Circuit arrangement

1. A circuit arrangement for a variable interconnection of energy generation and storage devices, comprising:

a bidirectional AC-to-DC converter having a DC side and an AC side, the AC side being connected to an electrical supply grid;

a first electrical switch connected to the DC side of the AC-to-DC converter;

a DC-to-DC converter having first and second sides, the first side of the DC-to-DC converter being connected to the DC side of the AC-to-DC converter via the first electrical switch;

a second electrical switch which connects the DC side of the AC-to-DC converter to the second side of the DC-to-DC converter;

a third electrical switch connected to the first side of the DC-to-DC converter;

an energy storage device connected to the first side of the DC-to-DC converter via the third electrical switch;

a fourth electrical switch connected to the second side of the DC-to-DC converter;

an energy generation device connected to the second side of the DC-to-DC converter via the fourth switch; and

a control device to selectively actuate the electrical switches and the converters.

2. The circuit arrangement as claimed in claim 1 , wherein the DC-to-DC converter is a bidirectional DC-to-DC converter.

3. The circuit arrangement as claimed in claim 1 , wherein

the DC-to-DC converter is configured to be unidirectional,

a fifth electrical switch is connected to the second side of the DC-to-DC converter, and

the second side of the DC-to-DC converter is connected to the energy storage device via the fifth electrical switch.

4. The circuit arrangement as claimed in claim 3 , wherein

the control device closes the fifth and first electrical switches and opens the second through fourth electrical switches, such that a current path connects the energy storage device via the DC-to-DC converter and the AC-to-DC converter to the electrical supply grid, in order to feed electrical energy stored in the energy storage device back to the electrical supply grid.

5. The circuit arrangement as claimed in claim 3 , wherein the control device closes the third and fourth electrical switches and opens the first, second and fifth electrical switches in order to feed the energy storage device from the energy generation device.

6. The circuit arrangement as claimed in claim 5 , wherein the control device closes the fourth and first electrical switches and opens the second, third and fifth electrical switches in order to feed energy generated in the energy generation device back to the electrical supply grid.

7. The circuit arrangement as claimed in claim 6 , wherein the control device comprises an optimization unit, configured to compute optimum actuation of the electrical switches taking into consideration predeterminable boundary conditions, wherein the boundary conditions comprise at least one type of information selected from the group consisting of:

outputs as low as possible for current drawn from the electrical supply grid,

intakes as high as possible for current fed back to the electrical supply grid,

electricity price fixed by an energy supplier,

electricity price statistically varying based on time of day,

controlling use of the energy storage device,

weather forecast, and

controlling state of charge of the energy storage device.

8. The circuit arrangement as claimed in claim 5 , wherein the control device closes the second and the third electrical switches and opens the first, fourth and fifth electrical switches in order to charge the energy storage device from the supply grid.

9. The circuit arrangement as claimed in claim 8 , wherein the control device comprises an optimization unit, configured to compute optimum actuation of the electrical switches taking into consideration predeterminable boundary conditions, wherein the boundary conditions comprise at least one type of information selected from the group consisting of:

outputs as low as possible for current drawn from the electrical supply grid,

intakes as high as possible for current fed back to the electrical supply grid,

electricity price fixed by an energy supplier,

electricity price statistically varying based on time of day,

controlling use of the energy storage device,

weather forecast, and

controlling state of charge of the energy storage device.

10. The circuit arrangement as claimed in claim 3 , wherein the control device closes the fourth and first electrical switches and opens the second, third and fifth electrical switches in order to feed energy generated in the energy generation device back to the electrical supply grid.

11. The circuit arrangement as claimed in claim 3 , wherein the control device closes the second and the third electrical switches and opens the first, fourth and fifth electrical switches in order to charge the energy storage device from the supply grid.

12. The circuit arrangement as claimed in claim 1 , wherein the control device comprises an optimization unit, configured to compute optimum actuation of the electrical switches taking into consideration predeterminable boundary conditions, wherein the boundary conditions comprise at least one type of information selected from the group consisting of:

outputs as low as possible for current drawn from the electrical supply grid,

intakes as high as possible for current fed back to the electrical supply grid,

electricity price fixed by an energy supplier,

electricity price statistically varying based on time of day,

controlling use of the energy storage device,

weather forecast, and

controlling state of charge of the energy storage device.