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Cascading type switched capacitor type AC-AC converter for achieving any depressurization transformation ratio

A switched capacitor and converter technology, which is used in output power conversion devices, AC power input conversion to AC power output, electrical components, etc., can solve the problem of increased loss of main switches and magnetic components, increased electromagnetic noise, and harmonic pollution. and other problems, to achieve the effect of reducing volume and weight, improving power density, and high power efficiency

Inactive Publication Date: 2015-07-15
CHINA JILIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 will be 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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  • Cascading type switched capacitor type AC-AC converter for achieving any depressurization transformation ratio

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Embodiment 1

[0053] Such as Figure 4 As shown, it is a circuit topology that can realize a 2 / 9 transformation ratio, and this circuit topology is composed of two-stage basic unit circuits. The first-level basic unit circuit includes 5 capacitors and 6 groups of power switch groups connected in series in sequence. The output voltage at the terminal can obtain a transformation ratio of 1 / 3 of the input voltage, and the output voltage at both ends of any two adjacent capacitors in the first-level basic unit can obtain a transformation ratio of 2 / 3 of the input voltage. analogy. The second-level basic unit circuit includes 5 capacitors and 6 groups of power switch groups connected in series in sequence. The output voltage at the end can be obtained with a transformation ratio of 1 / 3 of the input voltage. The second-level basic unit circuit is cascadedly connected to both ends of any two adjacent capacitors in the first-level basic unit circuit, and the two ends of any capacitor in the seco...

Embodiment 2

[0055] Such as Figure 5 As shown, it is a circuit topology that can realize a transformation ratio of 3 / 16. This circuit topology is composed of three basic unit circuits. The first-level basic unit circuit includes 7 capacitors and 8 power switch groups connected in series in sequence. The output voltage at the terminal can obtain a transformation ratio of 1 / 4 of the input voltage, and the output voltage at both ends of any two adjacent capacitors in the first-level basic unit can obtain a transformation ratio of 1 / 2 of the input voltage. The output voltage at both ends of any three adjacent capacitors in the first-level basic unit can obtain a transformation ratio of 3 / 4 of the input voltage. The second-level basic unit circuit includes 3 capacitors and 4 sets of power switch groups connected in series in sequence. The output voltage at the end can be obtained with a transformation ratio of 1 / 2 of the input voltage. The third-level basic unit circuit includes 3 capacitor...

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Abstract

The invention discloses a cascading type switched capacitor type AC-AC converter for achieving any depressurization transformation ratio. A plurality of basic unit circuits for achieving any input / output K / N transformation ratio are cascaded in sequence, each basic unit circuit is composed of a capacitor and a plurality of power switch sets which are sequentially connected in series, each power switch set comprises two power switch tubes with sources connected in series, a capacitor is in parallel connection to each of the two ends of a part formed by connecting any two adjacent power switch sets in series, and a driving circuit is connected with grids of the power switch tubes. The two ends of the part formed by connecting all power switch sets in the next basic unit circuit are connected to the two ends of any part formed by connecting a plurality of capacitors in the last basic unit circuit in series. According to the cascading type switched capacitor type AC-AC converter, a cascading mode is adopted for achieving voltage output of different gears with any depressurization transformation ratio, and the cascading type switched capacitor type AC-AC converter can be applied to design of other fixed gear speed regulating; only the capacitors serve as energy storage elements, and magnetic elements are not included, so that the size of the converter is reduced, the equivalent internal resistance is small, changes are basically avoided along with increase of the basic unit circuits, and the power density is high.

Description

technical field [0001] The invention relates to a converter without magnetic components, in particular to a cascaded switched capacitor AC-AC converter for realizing any step-down ratio in 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 ...

Claims

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Application Information

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IPC IPC(8): H02M5/293
Inventor 由甲川蔡慧包莅庭陈卫民汪伟
Owner CHINA JILIANG UNIV