Switched capacitor multi-level converter and multi-level inverter
A switched capacitor, multi-level technology, applied in output power conversion devices, electrical components, conversion of AC power input to DC power output, etc., can solve problems such as increasing the complexity of energy storage management systems and balancing circuits, and achieve improved System stability, cost reduction, and the effect of reducing output harmonics
Active Publication Date: 2017-01-04
FUHUADE ELECTRONICS DONGGUAN CO LTD
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Problems solved by technology
However, a large number of stacked energy storage devices will greatly increase the complexity of the energy storage management system and equalization circuit
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[0023] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.
[0024] In order to alleviate the problems caused by the increased complexity of the energy storage management system and equalization circuit in the prior art, the present invention provides a switched capacitor multilevel converter and a multilevel inverter with the switched capacitor multilevel converter , to double the voltage amplitude and the number of levels that can be output using switched capacitor technology. Therefore, not only the cost of the energy storage system of the variable frequency drive is greatly reduced, but also the output harmonics of the frequency converter are effectively reduced.
[0025] Since the multilevel inverter provided by the present invention includes the switched capacitor multilevel converter provided by the present invention, in order to reduce unnecessary repetition, when the multilevel inverte...
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The invention provides a switched capacitor multi-level converter and a multi-level inverter. The switched capacitor multi-level converter includes: a first switching device; a second switching device, a first input / output end of the first switching device is connected to a second input / output end of the second switching device; at least one branch circuit. Each branch circuit includes a third switching device, a capacitor, and a fourth switching device, and all the capacitors of the at least one branch circuit are in series connection and are connected to the first input / output end of the first switching device and the second input / output end of the second switching device. In each branch circuit, the third switching device and the fourth switching device both include a first input / output end, and a second input / output end, and the first input / output end of the third switching device is connected to the second input / output end of the fourth switching device and one end of the capacitor. According to the invention, the switched capacitor multi-level converter is advantaged by simple structure, stable system, and low cost.
Description
technical field [0001] The invention relates to the technical field of voltage conversion, in particular to a switched capacitor multilevel converter and a multilevel inverter. Background technique [0002] Compared with traditional bridge inverters, multilevel inverters can reduce the rating of electrical components and improve the quality of output power. Since there is no bulky and heavy filter inductor, the multilevel inverter integrated with switched capacitor technology can easily achieve the purpose of boosting voltage and increasing power density. Currently, most energy storage technologies are based on: electrochemical cells, supercapacitors and fuel cells. In order to provide sufficient voltage to drive most electrical loads, these energy storage devices need to be connected in series with each other. Since the energy storage device connected in series is essentially a multi-level voltage source, a multi-level output can be generated simply by using a bidirection...
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IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/5387H02M7/4835
Inventor 郑家伟陈宇澄方逸之
Owner FUHUADE ELECTRONICS DONGGUAN CO LTD