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Realization method of fixed transformation ratio switching capacitor AC/AC (Alternating Current/Alternating Current) converter

A technology of switching capacitors and implementation methods, which is applied in the direction of conversion equipment that can be converted to direct current without intermediate conversion, and can solve the problems of increased electromagnetic noise, large volume, and inability to meet the miniaturization of electrical and electronic equipment, and achieve improved power density. , the effect of reducing the volume

Inactive Publication Date: 2014-10-01
CHINA JILIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Traditional AC power conversion usually uses electromagnetic transformers, which have the advantages of electrical isolation, high efficiency, and large capacity, but also have disadvantages such as large volume, large audio noise, and harmonic pollution.
At the same time, traditional electromagnetic transformers cannot meet the requirements of miniaturization of electrical and electronic equipment.
[0003] One of the key technologies for the integration of power electronic systems is the miniaturization and miniaturization of magnetic components (inductors or transformers). It is undoubtedly a very effective measure to increase the switching frequency under the soft switching technology, so that the volume of the inductor and transformer in the circuit is reduced. It can be reduced, and the performance of the entire circuit is improved; however, when the switching frequency reaches about 400KHz-500KHz, the loss of the main switch and magnetic components increases, the conversion efficiency decreases, and the electromagnetic noise increases. The volume of the filter capacitor used to suppress noise With the increase, increasing the switching frequency can only bring negative impacts. Therefore, there is no room for reducing the size of the power supply by increasing the switching frequency.

Method used

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  • Realization method of fixed transformation ratio switching capacitor AC/AC (Alternating Current/Alternating Current) converter
  • Realization method of fixed transformation ratio switching capacitor AC/AC (Alternating Current/Alternating Current) converter
  • Realization method of fixed transformation ratio switching capacitor AC/AC (Alternating Current/Alternating Current) converter

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Embodiment Construction

[0016] Below in conjunction with accompanying drawing, the technical scheme of invention is described in detail:

[0017] Such as figure 1 As shown, a fixed-ratio switching capacitor AC / AC converter implementation method can realize u o =1 / 3u 1 . The main circuit contains 6 power switch tubes which are S 1 , S 2 , S 3 , S 4 , S 5 , S 6 , the five capacitors are C 1 、C 2 、C 3 、C 4 、C 5 . Output resistance R L The voltage across the u o is the output voltage of the switched capacitor AC / AC converter. Capacitance C 1 Make sure that the capacitor C 2 and capacitance C 3 The voltage across both ends is balanced, and the capacitor C 5 Make sure that the capacitor C 3 and capacitance C 4 The voltages across the terminals are balanced. During the entire voltage cycle, the voltages across each capacitor and power switch tube are equal to 1 / 3 of the input voltage.

[0018] In a switching cycle, the converter has two working states. Taking the positive half cycle ...

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Abstract

The invention discloses a realization method of a fixed transformation ratio switching capacitor AC / AC (Alternating Current / Alternating Current) converter, and belongs to the technical field of power electronic conversion. The fixed transformation ratio switching capacitor AC / AC converter is a typical non-magnetic element converter, and comprises capacitors and power switching tubes; the capacitors are main energy storage elements; the charge and discharge time of the capacitors is controlled by adjusting duty ratios of the power switching tubes to realize electric energy conversion; and a fixed input / output transformation ratio is 1 / 3 or 3. The converter comprises no magnetic element, so that the converter has the advantages of small size, light weight, high power density and the like. In addition, the converter has the characteristics of low equivalent internal resistance and high power supply efficiency.

Description

technical field [0001] The invention discloses a method for realizing a fixed-ratio switched capacitor AC / AC converter, which belongs to the technical field of power electronic conversion. Background technique [0002] Traditional AC power conversion usually uses electromagnetic transformers, which have the advantages of electrical isolation, high efficiency, and large capacity, but also have disadvantages such as large volume, large audio noise, and harmonic pollution. At the same time, traditional electromagnetic transformers cannot meet the requirements of miniaturization of electrical and electronic equipment. [0003] One of the key technologies for the integration of power electronic systems is the miniaturization and miniaturization of magnetic components (inductors or transformers). It is undoubtedly a very effective measure to increase the switching frequency under the soft switching technology, so that the volume of the inductor and transformer in the circuit is re...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M5/22
Inventor 蔡慧王忠阁汪伟郭育
Owner CHINA JILIANG UNIV
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