A power supply comprising: a plurality of power modules (Ma, Mb, Mc), input terminals of the plurality of power modules being electrically connected in star connection, wherein a first input terminal of each power module (Ma, Mb, Mc) is configured to be connected to a corresponding phase terminal of a multi-phase input voltage source which each are connected to a neutral point, wherein a second input terminal of each power module (Ma, Mb, Mc) is connected to a second input terminal of the other power modules (Ma, Mb, Mc) and connected to an artificial neutral point (Ny) in the power supply such that each power module receives a corresponding phase input voltage (Va, Vb, Vc), while output terminals of the plurality of power modules being electrically connected in parallel, wherein each of the plurality of power modules comprises: a first converter (120a, 120b, 120c) configured to convert the corresponding phase input voltage into an intermediate bus voltage (Vbusa, Vbusb, Vbusc); and a second converter (140a, 140b, 140c) configured to output a DC supply voltage (Vo) according to the intermediate bus voltage; and a control circuit electrically coupled to the plurality of power modules and configured to output a plurality of first driving signals (DS1a, DS1b, DS1c) to control the first converters in the plurality of power modules, and configured to output a plurality of second driving signals (DS2a, DS2b, DS2c) to control the second converters in the plurality of power modules; wherein the control circuit is configured to calculate a bus voltage average value (Vbusavg) according to the intermediate bus voltages of the plurality of power modules, and to generate the first driving signals and the second driving signals for the plurality of power modules according to the bus voltage average value. a plurality of power modules (Ma, Mb, Mc), input terminals of the plurality of power modules being electrically connected in star connection, wherein a first input terminal of each power module (Ma, Mb, Mc) is configured to be connected to a corresponding phase terminal of a multi-phase input voltage source which each are connected to a neutral point, wherein a second input terminal of each power module (Ma, Mb, Mc) is connected to a second input terminal of the other power modules (Ma, Mb, Mc) and connected to an artificial neutral point (Ny) in the power supply such that each power module receives a corresponding phase input voltage (Va, Vb, Vc), while output terminals of the plurality of power modules being electrically connected in parallel, wherein each of the plurality of power modules comprises: a first converter (120a, 120b, 120c) configured to convert the corresponding phase input voltage into an intermediate bus voltage (Vbusa, Vbusb, Vbusc); and a second converter (140a, 140b, 140c) configured to output a DC supply voltage (Vo) according to the intermediate bus voltage; and a first converter (120a, 120b, 120c) configured to convert the corresponding phase input voltage into an intermediate bus voltage (Vbusa, Vbusb, Vbusc); and a second converter (140a, 140b, 140c) configured to output a DC supply voltage (Vo) according to the intermediate bus voltage; and a control circuit electrically coupled to the plurality of power modules and configured to output a plurality of first driving signals (DS1a, DS1b, DS1c) to control the first converters in the plurality of power modules, and configured to output a plurality of second driving signals (DS2a, DS2b, DS2c) to control the second converters in the plurality of power modules; wherein the control circuit is configured to calculate a bus voltage average value (Vbusavg) according to the intermediate bus voltages of the plurality of power modules, and to generate the first driving signals and the second driving signals for the plurality of power modules according to the bus voltage average value.