Adjustable and controllable efficient charging circuit with three-phase random alternating current input

Abstract

The invention relates to a three-phase random AC input adjustable and controllable efficient charging circuit, which comprises a buck-boost DC voltage conversion unit and a lithium battery, and further comprises a three-phase random AC power supply, a switching unit; the self-adaptive three-phase rectifier unit comprises an active three-phase rectifier bridge, a passive three-phase rectifier bridge and a filter capacitor, and switching between the active three-phase rectifier bridge and the passive three-phase rectifier bridge is controlled by the switching unit; an impedance adjusting unit, wherein the impedance adjusting unit is a boost circuit; the microcontroller controls the switching unit, a switching device of the active three-phase rectifier bridge and a switching device of the impedance adjusting unit; and the output of the three-phase random alternating current power supply is sequentially connected with the switching unit, the self-adaptive three-phase rectification power supply, the impedance adjusting unit and the buck-boost direct current voltage conversion unit and then is output to supply power to the lithium battery. Compared with the prior art, the circuit has the advantages of reducing circuit energy loss and improving circuit efficiency.

Description

technical field [0001] The invention relates to the technical fields of energy management, high-efficiency charging and energy recovery, in particular to an adjustable and controllable high-efficiency charging circuit suitable for three-phase random AC input. Background technique [0002] At present, three-phase random (with intermittent, time-varying amplitude, frequency, and phase) alternating current often occurs in the industry and cannot be fully utilized. Especially in the field of renewable energy such as wind power generation and kinetic energy recovery power generation, due to the irregular excitation of the outside world, it has a large span, so the output energy flow also has a large span and random characteristics. [0003] There are many problems in the processing of such three-phase random alternating current and the design of the charging circuit. It has a large-span output voltage amplitude, which puts forward higher requirements for the voltage resistance of...

AI Technical Summary

Problems solved by technology

[0004] At present, there is no efficient and reliable charging circuit specially designed for three-phase random AC. If the charging circuit is not properly designed, efficiency optimization and impedance matching are not considered, the actual power obtained will be far lower than the ideal value.

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