A high voltage gain dc-dc converter

Abstract

The invention discloses a high-voltage gain DC-DC converter, comprising a DC power supply, a power switch tube, a three-winding coupled inductance, a capacitor and an output circuit; it controls the on or off of the power switch tube to control the switching of the working state of the circuit, In this way, it is controlled whether the DC power supply provides the energy required for circuit operation to the coupled inductor and capacitor. By changing the duty cycle of the control power switch and the turns ratio of the coupled winding, the change of the input and output voltage gain is realized, which is output by the output circuit. The present invention realizes the boost conversion of the output voltage to the DC power supply voltage by changing the turns ratio of the three-winding coupled inductance, which can effectively avoid the situation of the limit duty cycle, and use a smaller duty cycle to achieve high output voltage. Conversion function; because the structure of the present invention can effectively reduce the voltage stress of the device in the circuit, reduce the loss, and improve the overall working efficiency of the circuit.

Description

technical field [0001] The invention belongs to the technical field of DC-DC conversion equipment, and in particular relates to a high-voltage gain DC-DC converter. Background technique [0002] At present, high-gain DC-DC boost converters are widely used in new energy fields, including photovoltaic systems, wind power generation, fuel cells, etc. However, the DC voltage level generated by resources such as photovoltaics and FCs is low, which is not suitable for grid integration. In view of the above mentioned problems, high boost DC-DC converters are required to increase the output DC voltage level of such resources. [0003] In recent years, various boost DC-DC converters with boost technology have been proposed. Isolation converters utilize transformers with large turns ratios, which have higher voltage conversion ratios. However, an excessively large turns ratio will lead to excessive leakage inductance, thereby reducing converter efficiency and increasing switching v...

AI Technical Summary

Problems solved by technology

However, low voltage conversion ratio, semiconductor high-voltage stress, and reverse recovery issues are fundamental issues for this converter in high-power applications.

Literature "A.Ajami, H.Ardi, and A.Farakhor, Anovel high step-up DC-DC converter based on integrating coupled inductor and switched-capacitor techniques for renewable energy applications, IEEE Trans.PowerElectron., vol.30, no .8, pp.4255–4263, Aug.2015." and "M. Eskandarpour Azizkandi, F. Sedaghati, and H. Shayeghi, An interleaved configuration of modified KYconverter with high conversion ratio for renewable energy applications; design, analysis and implementation, J.Oper.Autom.Power Eng., vol.7, no.1, pp.90–106, 2019.” proposed switched inductor (SL) and switched capacitor (SC) converters, which have high gain However, the circuit is complex and the current stress is large

Literature "X.Hu, J.Wang, L.Li, and Y.Li, Athree-winding coupled-inductor DC-DC converter topology with high voltage gain and reduced switch stress, IEEETrans.Power Electron., vol.33, no .2, pp.1453–1462, Feb.2018.” and literature “K.C.Tseng, J.T.Lin, and C.C.Huang, High step-up converter with three-winding coupler inductor for fuel cell energy source applications, EEE Trans.Power Electron. , vol.30, no.2, pp.574–581, Feb.2015.” proposed several high-boost DC-DC converters based on three-winding coupled inductors, the adjustment of voltage stress and voltage gain is more flexible, however Gain is not high enough

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