US 11,990,749 B2
Power supply cell and power supply system using the same
Kuenfaat Yuen, Hong Kong (CN); Tinho Li, Hong Kong (CN); and Kai Tian, Hebei (CN)
Assigned to ABB E-MOBILITY B.V., Delft (NL)
Filed by ABB Schweiz AG, Baden (CH)
Filed on Mar. 25, 2021, as Appl. No. 17/212,593.
Application 17/212,593 is a continuation of application No. PCT/CN2018/107984, filed on Sep. 27, 2018.
Prior Publication US 2021/0211050 A1, Jul. 8, 2021
Int. Cl. H02J 1/10 (2006.01); H02J 7/00 (2006.01); H03K 17/00 (2006.01)
CPC H02J 1/108 (2013.01) [H02J 7/0063 (2013.01); H03K 17/005 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A power supply system, including:
a first power supply cell and a second power supply cell, the first power supply cell and the second power supply cell each including:
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;
a second controllable unidirectional semiconductor switch operative to generate a fourth conduction path from the positive output port terminal of the first power supply cell to the negative output port terminal of the second power supply cell;
a fourth unidirectional semiconductor switch operative to generate a fifth conduction path from the positive output port terminal of the first power supply cell to the positive output port terminal of the second power supply cell;
a fifth unidirectional semiconductor switch operative to generate a sixth conduction path from the negative output port terminal of the first power supply cell to the negative output port terminal of the second power supply cell;
a second low-pass filter; and
a controller operative to issue turn-on signal or turn-off signal to the second controllable unidirectional semiconductor switch so that the first power supply cell and the second power supply cell supply current to the second low-pass filter via the fourth conduction path or both of the fifth conduction path and the sixth conduction path;
wherein the controller is further operative to issue control signal to the first power supply cell and the second power supply cell so that DC output voltage from the first power supply cell is substantially equal to DC output voltage from the second power supply cell.