Switching switched capacitor ac-ac converter with fixed ratio 1/4 or 4

Abstract

The invention discloses a switched switch capacitor type AC-AC converter with the fixed transformation ratio of 1 / 4 or 4. The switched switch capacitor type AC-AC converter comprises seven capacitors and eight power switch sets, the eight power switch sets are sequentially connected in series, each power switch set comprises two power switch tubes, and the source electrodes of the power switch tubes are connected in series. The two ends of two connected adjacent power switch sets in series are both connected with the capacitors, and a driving circuit is connected with the grid electrode of each power switch set. When the voltage of the converter drops, the input end of the converter is connected to the two ends of the eight power switch sets, and the output end is connected to the two ends of any capacitor. When the voltage of the converter rises, the input end of the converter is connected to the two ends of any capacitor, and the output end is connected to the two ends of the eight power switch sets. According to the switched switch capacitor type AC-AC converter, only the capacitors serve as energy storage elements, magnetic elements are not arranged, the input and output fixed transformation ratio is 1 / 4 or 4, the size of the converter is reduced, and the switched switch capacitor type AC-AC converter has the advantages of being low in equivalent internal resistance, high in power density, small in size, light in weight, high in power efficiency and the like.

Description

technical field [0001] The invention relates to an AC-AC converter, in particular to a switching capacitor type AC-AC converter with a fixed transformation ratio of 1 / 4 or 4. 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 reduced. It can...

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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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