Patent ID: 9337689
Filing Date: 2016-05-10
CPC Classification: H02J

Claim Text:
1. A power supply system, comprising: a first Alternating Current (AC) source and a second AC source; a circuit switching module; a controllable Alternating Current to Direct Current (AC/DC) conversion module electrically coupled to the circuit switching module and configured to convert AC output from the circuit switching module into DC; a subsequent stage power supply module electrically coupled to the controllable AC/DC conversion module and configured to convert the DC output from the controllable AC/DC conversion module into an electrical signal required by a load; and a control module electrically coupled to the circuit switching module and the controllable AC/DC conversion module and configured to receive operation state signals of the first AC source and the second AC source, and when failure occurs in any one of the first AC source and the second AC source, to control the circuit switching module to switch to the other one of the first AC source and the second AC source which is in normal operation, wherein the subsequent stage power supply module comprises a Power Factor Correction (PFC) module and a power conversion module, the PFC module being electrically coupled to the controllable A/C conversion module, a first output terminal and a second output terminal of the PFC module being electrically coupled to the power conversion module, and the power conversion module outputting the electrical signal required by the load, wherein the PFC module comprises a bus capacitor, which has two terminals electrically coupled to the first output terminal and the second output terminal of the PFC module respectively and which is arranged between the PFC module and the power conversion module, and wherein failure occurs in one of the first AC source and the second AC source, the control module is configured to cut off the control signal for the controllable AC/DC conversion module, then control the circuit switching module to switch to the other one of the first AC source and the second AC source which is in normal operation, receive an instantaneous value of an input voltage of the controllable AC/DC conversion module and a value of a voltage across the bus capacitor, and then enable the control signal for the controllable AC/DC conversion module when the instantaneous value of the input voltage of the controllable AC/DC conversion module is less than the value of the voltage across the bus capacitor.