公开(公告)号：US20210211051A1

公开(公告)日：2021-07-08

申请号：US17212656

申请日：2021-03-25

Applicant: ABB Schweiz AG

Inventor： Kuenfaat Yuen ,  Tinho Li ,  Kai Tian

IPC: H02M3/158

Abstract: An objective of the disclosure is to provide a power supply cell of a power supply system and a power supply system using the same. The power supply cell includes a first power conversion circuit operative to output a first DC voltage across its first positive terminal and first negative terminal, a second power conversion circuit operative to output a second DC voltage across its second positive terminal and second negative terminal, a first controllable unidirectional semiconductor switch operative to generate a first conduction path from the first positive terminal of the first power conversion circuit to the second negative terminal of the second power conversion circuit, a first unidirectional semiconductor switch operative to generate a second conduction path from the first positive terminal of the first power conversion circuit to the second positive terminal of the second power conversion circuit, a second unidirectional semiconductor switch operative to generate a third conduction path from the first negative terminal of the first power conversion circuit to the second negative terminal of the second power conversion circuit, a first low-pass filter, a second low-pass filter, a third low-pass filter and a controlling unit. The controlling unit is operative to: issue turn-on signal to the first controllable unidirectional semiconductor switch so that the first power conversion circuit and the second power conversion circuit supply current to the first low-pass filter via the first conduction path, the second low-pass filter and the third low-pass filter; or issue turn-off signal to the first controllable unidirectional semiconductor switch so that the first power conversion circuit and the second power conversion circuit supply currents to the first low-pass filter in parallel via the second conduction path and the second low-pass filter together with the third conduction path and the third low-pass filter. The first low-pass filter can help smooth an output voltage and current in order to achieve a relatively wide linearly constant output power range.

公开(公告)号：US20210211050A1

公开(公告)日：2021-07-08

申请号：US17212593

申请日：2021-03-25

Applicant: ABB Schweiz AG

Inventor： Kuenfaat Yuen ,  Tinho Li ,  Kai Tian

IPC: H02M3/158

Abstract: An objective of the present application is to to provide a power supply cell of a power supply system and a power supply system using the same. The power supply cell includes a first power conversion circuit operative to output a first DC voltage across its first output positive terminal and first output negative terminal, a second power conversion circuit operative to output a second DC voltage across its second output positive terminal and second output negative terminal, a first controllable unidirectional semiconductor switch operative to generate a first conduction path from the first output positive terminal of the first power conversion circuit to the second output negative terminal of the second power conversion circuit, a first unidirectional semiconductor switch operative to generate a second conduction path from the first output positive terminal of the first power conversion circuit to the second output positive terminal of the second power conversion circuit, a second unidirectional semiconductor switch operative to generate a third conduction path from the first output negative terminal of the first power conversion circuit to the second output negative terminal of the second power conversion circuit, a first low-pass filter and a controlling unit operative to issue turn-on signal or turn-off signal to the first controllable unidirectional semiconductor switch so that the first power conversion circuit and the second power conversion circuit supply current to the low-pass filter via the first conduction path or both of the second conduction path and the third conduction path. The first low-pass filter can help smooth the power supply cell's output voltage and current in order to achieve a relatively wide linearly constant output power range. By controlling the ration of series and parallel connection in a switching cycle of the switching frequency by the switching arrangement, both the output voltage and current range of the power supply cell can be enlarged smoothly and linearly with the help of the first low-pass filter.