Series connection of switching regulators for energy transfer in battery systems
An energy transformer for a battery system is disclosed. The energy transformer includes a first and a second primary DC/DC converter each having two inputs and two outputs. The inputs are designed for connecting a battery module and the first and the second primary DC/DC converters are connected in series on the output side. The energy transformer has at least one first secondary DC/DC converter having two inputs that are connected to the outputs of the second primary DC/DC converter and a first output connected to one of the outputs of the first primary DC/DC converter.
1. An energy transmitter for a battery system, the energy transmitter comprising:
a first and a second primary DC/DC converter, each having two inputs and two outputs, the inputs being designed for connection of a battery module, and the first and second primary DC/DC converters being connected in series on the output side, and
at least one first secondary DC/DC converter with two inputs, which are connected to the outputs of the second primary DC/DC converter, and with a first output, which is connected to one of the outputs of the first primary DC/DC converter.
2. The energy transmitter as claimed in claim 1 , in which the first secondary DC/DC converter is designed to draw energy from the second primary DC/DC converter and to transmit energy to the first primary DC/DC converter.
3. The energy transmitter as claimed in claim 1 , further comprising a second secondary DC/DC converter with two inputs, which are connected to the outputs of the first primary DC/DC converter, and with a first output which is connected to one of the outputs of the second primary DC/DC converter, the second secondary DC/DC converter being designed to draw energy from the first primary DC/DC converter.
4. The energy transmitter as claimed in claim 1 , further comprising a third primary DC/DC converter two inputs designed for connection of a battery module and two outputs, the third primary DC/DC converter being connected in series with the first and second primary DC/DC converters on the output side in such a way that the second primary DC/DC converter is connected directly to the first and third primary DC/DC converters, and the first secondary DC/DC converter having a second output, which is connected to an output of the third primary DC/DC converter.
5. The energy transmitter as claimed in claim 4 , in which the first secondary DC/DC converter is designed to draw energy from the second primary DC/DC converter and to transmit energy to the first primary DC/DC converter in a discharge mode of the energy transmitter for discharging the battery module and to the third primary DC/DC converter in a charge mode of the energy transmitter for charging the battery module.
6. The energy transmitter as claimed in claim 1 , in which the first secondary DC/DC converter has a coil, a first switch, and a first diode, the coil and the first switch being connected in series between the inputs of the first secondary DC/DC converter, and the diode being connected between a node between the coil and the first switch and the first output of the first secondary DC/DC converter.
7. The energy transmitter as claimed in claim 6 , in which the first secondary DC/DC converter also has a second switch and a second diode, the second switch being connected in series with the first switch and the coil between the inputs of the first secondary DC/DC converter in such a way that the coil is connected between the first and second switches, and the second diode being connected between a node between the coil and the second switch and the second output of the first secondary DC/DC converter.
8. The energy transmitter as claimed in claim 1 , in which each primary DC/DC converter has a control input for a control signal and is designed to electrically connect the outputs of the primary DC/DC converter to one another and to electrically decouple at least one of the inputs of the primary DC/DC converter, for reception of the control signal.
9. A battery system, comprising:
an energy transmitter; and
a plurality of battery modules, which each have at least one battery cell and battery terminals,
wherein the energy transmitter comprises a first and a second primary DC/DC converter, each having two inputs and two outputs, and the first and second primary DC/DC converters being connected in series on the output side, and at least one first secondary DC/DC converter with two inputs, which are connected to the outputs of the second primary DC/DC converter, and with a first output, which is connected to one of the outputs of the first primary DC/DC converter, and
wherein the battery terminals are detachably connected to the inputs of one of the primary DC/DC converters of the energy transmitter.
10. A motor vehicle having an energy transmitter, the energy transmitter comprising:
a first and a second primary DC/DC converter, each having two inputs and two outputs, the inputs being designed for connection of a battery module, and the first and second primary DC/DC converters being connected in series on the output side, and
at least one first secondary DC/DC converter with two inputs, which are connected to the outputs of the second primary DC/DC converter, and with a first output, which is connected to one of the outputs of the first primary DC/DC converter.