Variable switch capacitive type AC-AC convertor achieving 1/2 n no-load voltage ratio

Abstract

The invention discloses a variable switch capacitive type AC-AC convertor achieving 1 / 2 n no-load voltage ratio. The variable switch capacitive type AC-AC convertor achieving 1 / 2 n no-load voltage ratio is mainly composed of sequentially cascading of multiple basic unit circuits. Each basic unit circuit comprises three capacitances and four power switching groups which are in series connection in sequence. Each power switching group comprises two power switching pipes with two poles are in series connection, and two ends are both connected with one capacitance in parallel after any two adjacent power switching groups are connected in series respectively; a cascade mode is that the two ends after the four power switching groups in an inferior basic unit circuit are in parallel connection with the two ends of any capacitance in a superior basic unit circuit. According to the variable switch capacitive type AC-AC convertor achieving 1 / 2 n no-load voltage ratio, voltage output of different gears with 1 / 2 n no-load voltage ratio is achieved by adopting the cascade mode, and the variable switch capacitive type AC-AC convertor achieving 1 / 2 n no-load voltage ratio can be applied to design of speed adjusting of different gears; the capacitances serve as an energy storage element, the size of the convertor is reduced, the equivalent internal resistance is small and change of the equivalent internal resistance does not occur with the increase of progression of the basic unit circuit, and the power density is high.

Description

technical field [0001] The present invention relates to a converter without magnetic components, in particular to an implementation in the technical field of power electronic conversion1 / 2 n Variable ratio switched capacitor AC-AC converter. 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 volum...

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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 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.

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