公开(公告)号：US10530274B2

公开(公告)日：2020-01-07

申请号：US16294065

申请日：2019-03-06

Applicant: SMA Solar Technology AG

Inventor： Burkard Mueller ,  Klaus Rigbers ,  Wilfried Vogt

IPC: H02M7/5387 ,  H02M1/32 ,  H02J3/38

Abstract: A method for operating a transformerless inverter includes operating first and second half-bridges of the inverter using a unipolar clocking method as a first clocking method, determining a value of a grid-frequency stray current at the DC terminals of the inverter during the unipolar clocking method, and when a limit value is exceeded by the stray current value, operating the first and second half-bridges of the inverter using a stray-current-reducing clocking method as a second clocking method in which the first half-bridge provides an AC voltage at the first AC output, wherein an amplitude of the AC voltage is less than 50% of the amplitude of a voltage amplitude of the grid, and the second half-bridge provides a difference voltage between the grid voltage and the voltage provided by the first half-bridge at the first AC output.

公开(公告)号：US20190207534A1

公开(公告)日：2019-07-04

申请号：US16294065

申请日：2019-03-06

Applicant: SMA Solar Technology AG

Inventor： Burkard Mueller ,  Klaus Rigbers ,  Wilfried Vogt

IPC: H02M7/5387 ,  H02J3/38

Abstract: A method for operating a transformerless inverter includes operating first and second half-bridges of the inverter using a unipolar clocking method as a first clocking method, determining a value of a grid-frequency stray current at the DC terminals of the inverter during the unipolar clocking method, and when a limit value is exceeded by the stray current value, operating the first and second half-bridges of the inverter using a stray-current-reducing clocking method as a second clocking method in which the first half-bridge provides an AC voltage at the first AC output, wherein an amplitude of the AC voltage is less than 50% of the amplitude of a voltage amplitude of the grid, and the second half-bridge provides a difference voltage between the grid voltage and the voltage provided by the first half-bridge at the first AC output.

公开(公告)号：US09912218B2

公开(公告)日：2018-03-06

申请号：US14182897

申请日：2014-02-18

Applicant: SMA Solar Technology AG

Inventor： Wilfried Vogt

IPC: H02M3/06 ,  H02M1/00 ,  H02J3/38 ,  H02M7/48

CPC classification number: H02M1/00 ,  H02J3/383 ,  H02M7/48 ,  Y02E10/563

Abstract: For defining an electric potential of input lines of an inverter with respect to ground, in all current-carrying output lines of the inverter capacitors are arranged and charged to a DC voltage in order to shift the electric potential of the input lines with respect to a reference potential present at the current-carrying output lines of the inverter by this DC voltage.

公开(公告)号：US20140159504A1

公开(公告)日：2014-06-12

申请号：US14182897

申请日：2014-02-18

Applicant: SMA Solar Technology AG

Inventor： Wilfried Vogt

IPC: H02M1/00

CPC classification number: H02M1/00 ,  H02J3/383 ,  H02M7/48 ,  Y02E10/563

Abstract: For defining an electric potential of input lines of an inverter with respect to ground, in all current-carrying output lines of the inverter capacitors are arranged and charged to a DC voltage in order to shift the electric potential of the input lines with respect to a reference potential present at the current-carrying output lines of the inverter by this DC voltage.

Abstract translation: 为了定义逆变器相对于地的输入线的电位，在逆变器电容器的所有载流输出线中布置并充电到DC电压，以便将输入线的电势相对于 通过该直流电压存在于逆变器的载流输出线上的参考电位。