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AssigneeSMA Solar Technology AG
InventorsThomas Wappler, Alexander Unru, Burkard Müller
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The application relates to a power converter for ground-fault-protected exchange of electrical power between a three-phase AC voltage grid and a battery, wherein the power converter includes an AC terminal, a DC terminal, a bridge circuit and a DC-to-DC converter, wherein the AC terminal is provided for connection to the AC voltage grid and the DC terminal is provided for connection to the battery, wherein a DC link is arranged between the DC-to-DC converter and the DC terminal and a bridge intermediate circuit is arranged between the DC-to-DC converter and the bridge circuit, wherein the DC-to-DC converter comprises clocked semiconductor switches which are configured to generate a voltage transmission ratio between the DC link and the bridge intermediate circuit during the exchange of electrical power, and wherein the DC-to-DC converter includes at least one further semiconductor switch which is configured to establish a connection between the DC link and the bridge intermediate circuit during the exchange of electrical power and to interrupt this connection in the event of a ground fault.
A power converter for ground-fault-protected exchange of electrical power between a three-phase AC voltage grid and a battery, wherein the power converter comprises an AC terminal, a DC terminal, a bridge circuit and a DC-to-DC converter, wherein the AC terminal is provided for connection to the three-phase AC voltage grid and the DC terminal is provided for connection to the battery, wherein a DC link having a DC voltage is arranged between the DC-to-DC converter and the DC terminal and a bridge intermediate circuit having a bridge DC voltage is arranged between the DC-to-DC converter and the bridge circuit, wherein the DC-to-DC converter comprises clocked semiconductor switches which are configured to generate a voltage transmission ratio between the DC link and the bridge intermediate circuit during an exchange of electrical power, and wherein the DC-to-DC converter comprises at least one further semiconductor switch with a controller which is configured to establish a connection between the DC link and the bridge intermediate circuit during the exchange of electrical power by actuating the further semiconductor switch and to interrupt this connection in the event of a ground fault.
A method for ground-fault-protected exchange of electrical power between a three-phase AC voltage grid and a battery by means of a power converter, wherein the power converter comprises a bridge circuit and a DC-to-DC converter, wherein a DC link having a DC voltage is arranged between the DC-to-DC converter and the battery, and a bridge intermediate circuit having a bridge DC voltage is arranged between the DC-to-DC converter and the bridge circuit,
A method for ground-fault-protected exchange of electrical power between a three-phase AC voltage grid and a battery by means of a power converter, wherein the power converter comprises a bridge circuit and a DC-to-DC converter, wherein a DC link having a DC voltage is arranged between the DC-to-DC converter and the battery, and a bridge intermediate circuit having a bridge DC voltage is arranged between the DC-to-DC converter and the bridge circuit, wherein center potentials of the DC link and the bridge intermediate circuit are connected to each other via an RC-circuit, wherein the DC-to-DC converter generates a voltage transmission ratio between the DC link and the bridge intermediate circuit during the exchange of electrical power by means of clocked semiconductor switches such that the DC voltage is limited to less than half the bridge DC voltage.
Dependencies are inferred from the claim text.