Abstract: The present disclosure provides a DC power supply system, comprising: a first power supply circuit and a second power supply circuit, each power supply circuit comprises a phase-shifting transformer and an AC-DC conversion circuit; and a bidirectional electronic switch electrically coupled between the output end of the first power supply circuit and the output end of the second power supply circuit, wherein the bidirectional electronic switch is configured to transmit power between the output end of the first power supply circuit and the output end of the second power supply circuit depend on the voltage difference of the two output voltages.

Abstract: A direct current power supply system includes at least one first input source, a second input source, a phase shifting transformer set, a rectifier set and a monitoring module. The phase shifting transformer set is for converting a medium voltage alternating current of the first input source and/or the second input source to a low voltage alternating current. The rectifier set is for rectifying the low voltage AC to a low voltage DC. The phase shifting transformer set and the rectifier set are disposed either in a power supply housing, or in two adjacent power supply housings. The monitoring module includes a phase shifting transformer monitoring unit for retrieving at least one of temperature data, voltage data and current data of the phase shifting transformer set and a rectifier monitoring unit for retrieving at least one of temperature data, voltage data and current data of the rectifier set.

Abstract: The present disclosure discloses a method and system for reducing a circulating current between a plurality of non-isolated modules operating in parallel. The input terminals and the output terminals of the plurality of non-isolated modules are respectively connected in parallel, and each of the non-isolated modules comprises a first stage converter, a bus capacitor and a second stage converter, which are electrically connected in sequence. For each of the non-isolated modules, the method comprises: comparing a first signal reflecting the input power of the non-isolated module with a reference value to obtain a comparison result; and adjusting the voltage of the bus capacitor according to the comparison result, wherein the voltage of the bus capacitor is decreased when the first signal is greater than the reference value, and the voltage of the bus capacitor is increased when the first signal is less than the reference value.

Abstract: The present disclosure provides a DC power supply system, comprising: a first power supply circuit and a second power supply circuit, each power supply circuit comprises a phase-shifting transformer and an AC-DC conversion circuit; and a bidirectional electronic switch electrically coupled between the output end of the first power supply circuit and the output end of the second power supply circuit, wherein the bidirectional electronic switch is configured to transmit power between the output end of the first power supply circuit and the output end of the second power supply circuit depend on the voltage difference of the two output voltages.

Abstract: The present disclosure discloses a method and system for reducing a circulating current between a plurality of non-isolated modules operating in parallel. The input terminals and the output terminals of the plurality of non-isolated modules are respectively connected in parallel, and each of the non-isolated modules comprises a first stage converter, a bus capacitor and a second stage converter, which are electrically connected in sequence. For each of the non-isolated modules, the method comprises: comparing a first signal reflecting the input power of the non-isolated module with a reference value to obtain a comparison result; and adjusting the voltage of the bus capacitor according to the comparison result, wherein the voltage of the bus capacitor is decreased when the first signal is greater than the reference value, and the voltage of the bus capacitor is increased when the first signal is less than the reference value.

Abstract: A direct current power supply system includes at least one first input source, a second input source, a phase shifting transformer set, a rectifier set and a monitoring module. The phase shifting transformer set is for converting a medium voltage alternating current of the first input source and/or the second input source to a low voltage alternating current. The rectifier set is for rectifying the low voltage AC to a low voltage DC. The phase shifting transformer set and the rectifier set are disposed either in a power supply housing, or in two adjacent power supply housings. The monitoring module includes a phase shifting transformer monitoring unit for retrieving at least one of temperature data, voltage data and current data of the phase shifting transformer set and a rectifier monitoring unit for retrieving at least one of temperature data, voltage data and current data of the rectifier set.