High-voltage DC power-taking circuit

Abstract

The embodiment of the invention provides a high-voltage DC power supply circuit. The high-voltage DC power supply circuit comprises a high-frequency isolation transformer, a power supply circuit, an output rectification diode, a freewheel diode, a magnetic reset circuit, a first MOS (metal oxide semiconductor) transistor and a second MOS transistor, wherein the magnetic reset circuit, the first MOS transistor and the second MOS transistor are sequentially connected in series; the magnetic reset circuit is connected in parallel to the primary side of the high-frequency isolation transformer; the high-voltage end of the primary side of the high-frequency isolation transformer serves as the high-voltage end of the input end of the high-voltage DC power supply circuit; the source electrode of the second MOS transistor is the low-voltage end of the input end of the high-voltage DC power supply circuit; the power supply circuit is connected with the first MOS transistor and the second MOS transistor for providing driving pulse to the first MOS transistor and the second MOS transistor; the secondary side of the high-frequency isolation transformer is connected with the output rectification diode and the freewheel diode; both ends of the freewheel diode are the voltage output ends of the high-voltage DC power supply circuit. The high-voltage DC power supply circuit enables a circuit system to be stable during high-voltage power supply.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a high-voltage DC power-taking circuit. Background technique [0002] With the continuous improvement of the design level of converters in wind turbines (referred to as "units"), it has gradually become a trend in the development of power supply for the control system in the unit to take power from the DC bus to supply power to the control system in the unit. Conventional DC / DC switching power supplies have high withstand voltage requirements for power devices, and the input voltage range is relatively narrow. The corresponding conventional circuit topologies such as single-ended forward circuits and power devices are mostly used in working environments below 100V. At present, most of the research on high-voltage DC power acquisition at home and abroad is aimed at the converter system with the DC bus voltage below 1000V. [0003] As for the high-voltage system of the c...

AI Technical Summary

Problems solved by technology

[0003] For the high-voltage system of the converter in the unit, its normal working voltage is usually higher than 1000V, so the existing circuit topology cannot meet the design requirements of the unit converter

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