Secondary type high-gain boosting converter with switched capacitors and coupled inductor

Abstract

The invention discloses a secondary type high-gain boosting converter with switched capacitors and a coupled inductor. The secondary type high-gain boosting converter comprises a direct-current input power source, a first inductor, a first diode, the coupled inductor, the first capacitor, a second diode, a switching tube, a third diode, the second capacitor, a fourth diode, the third capacitor, a fifth diode, the fourth capacitor, a sixth diode, the fifth capacitor, a seventh diode, an eighth diode, the first output capacitor, the second output capacitor and a load. According to the secondary type high-gain boosting converter, a driving circuit and a main circuit are grounded together and share only one switching tube, a control circuit is simple, the higher output voltage gain is obtained under the low duty ratio, the input current and output voltage ripples are reduced, the voltage stress and turn-on losses of a switching element are reduced, meanwhile, the turn ratio of the coupled inductor needed by the circuit is small, and the saturation problem of a magnetic core component is avoided. The secondary type high-gain boosting converter is quite suitable for occasions of low-voltage input and high-voltage output.

Description

technical field [0001] The invention relates to the technical field of DC / DC converters, in particular to a secondary high-gain boost converter with switched capacitors and coupled inductors. Background technique [0002] Solar photovoltaic panels, fuel cells, batteries, and supercapacitors output low DC voltages of 12V to 35V. In order to be connected to the grid, a step-up converter is usually required to boost the voltage to 370V to 400V. The gain of the traditional BOOST converter decreases rapidly with the increase of the duty cycle, which seriously affects the output voltage and efficiency. The traditional flyback converter generally works in discontinuous mode, and the leakage inductance has a great influence on the switching tube. The gain of the traditional quadratic BOOST converter is relatively high, but the gain is limited by the duty cycle. When the duty cycle increases, the output voltage and efficiency are seriously affected. Therefore, traditional converter...

AI Technical Summary

Problems solved by technology

The gain of the traditional BOOST converter decreases rapidly with the increase of the duty cycle, which seriously affects the output voltage and efficiency

The traditional flyback converter generally works in discontinuous mode, and the leakage inductance has a great influence on the switching tube

The gain of the traditional quadratic BOOST converter is relatively high, but the gain is limited by the duty cycle. When the duty cycle increases, the output voltage and efficiency are seriously affected.

Therefore, traditional converters such as BOOST converters, flyback converters and secondary BOOST converters are not suitable for low-voltage input and high-voltage output occasions.

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