Staggered series direct current (DC)/DC converter circuit

Abstract

The invention discloses a staggered series direct current (DC) / DC converter circuit and aims to provide a DC / DC converter circuit which is small in ripple wave, high in conversion efficiency, convenient to manufacture, smaller in size and high in performance. The staggered series DC / DC converter circuit comprises an input DC voltage, a DC / DC module, a filtering circuit, a load and a control circuit, wherein the DC / DC module comprises a first module (DC1) and a second module (DC2), which have the same structure; input ends of the first module (DC1) and the second module (DC2) are connected in parallel and then connected with the input DC voltage; output ends of the first module (DC1) and the second module (DC2) are connected in series and then connected with the filtering circuit and the load; the control circuit is connected with the DC / DC module; and control signals of the first module (DC1) and the second module (DC2) are staggered at a certain angle.

Description

technical field [0001] The invention relates to an interleaved series DC / DC converter circuit. Background technique [0002] In the special equipment market, such as high-voltage low-current chargers and electric vehicle charging stations, there is an increasing demand for power supply equipment with hundreds of volts, and the conversion efficiency can reach more than 90%, and the power factor is greater than 0.99. The miniaturized switching power supply required by EMC is even more rare. Conventional switching power supply with high output voltage and low current (such as the three-level LLC series resonant DC / DC converter disclosed in Chinese patent CN03150858.8), although it has the advantages of LLC series resonant DC / DC converter, and by reducing each The voltage stress of the switching tube meets the requirement of outputting a large voltage, but there is a large ripple when the large voltage is output, which reduces the stability of the entire system and inevitably i...

AI Technical Summary

Problems solved by technology

Conventional switching power supply with high output voltage and low current (such as the three-level LLC series resonant DC / DC converter disclosed in Chinese patent CN03150858.8), although it has the advantages of LLC series resonant DC / DC converter, and by reducing each The voltage stress of the switching tube meets the requirement of outputting a large voltage, but there is a large ripple when the large voltage is output, which reduces the stability of the entire system and inevitably increases the input capacitance and output capacitance. The size of the entire DC / DC converter is limited, making it difficult to achieve the purpose of miniaturization

To sum up, the current DC / DC converters in the prior art have the defects of large ripple, low conversion efficiency, and difficulty in miniaturization

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