Power supply system

A power source system comprising;

• a first direct current power source,
• a second direct current power source,
• a power converter comprising a boost chopper circuit, wherein the boost chopper circuit is configured to provide a bi-directional current boost and step-down, wherein the boost chopper circuit includes a plurality of switching elements for performing direct current power conversion between a power source line electrically connected to a load, and the first and the second direct current power sources, and
• a control device configured to control on-off of the plurality of switching elements in accordance with a pulse width modulation control for controlling an output voltage on the power source line,
• wherein the plurality of switching elements are disposed to be included in both a first power conversion path formed between the first direct current power source and the power source line, and a second power conversion path formed between the second direct current power source and the power source line,
• wherein the power converter has a first operation mode for performing the direct current power conversion between the first and second direct current power sources and the power source line in parallel,
• wherein the control device is configured to vary a phase difference between a first carrier signal used for a first pulse width modulation control to control a first power conversion via the first power conversion path, and a second carrier signal used for a second pulse width modulation control to control a second power conversion via the second power conversion path in the first operation mode, according to an operation condition of the power converter, and
• wherein the control device is configured to generate control signals of on-off of the plurality of switching elements on the basis of a first control pulse signal obtained by the first pulse width modulation control and a second control pulse signal obtained by the second pulse width modulation control.