Single-switch high-gain boosting DC (direct current)/DC converter

Abstract

The invention discloses a single-switch high-gain boosting DC (direct current) / DC converter, comprising a DC input power supply, a first inductor, a first diode, a second diode, a second inductor, a first capacitor, a switch tube, a third diode, a second capacitor, a third inductor, a third capacitor, a fourth diode and an output capacitor; the DC input power supply is connected with the first inductor, the first capacitor, the switch tube, the third capacitor, the output capacitor and a load respectively; the first inductor is respectively connected with the first diode and the second diode; the second inductor is respectively connected with the first diode, the switch tube, the third diode, the second capacitor, the second diode and the first capacitor; the second capacitor is connected with the third inductor and the fourth diode respectively; the third diode is respectively connected with the third inductor and the third capacitor; the fourth diode is respectively connected with the output capacitor and the load. Compared with the prior art, the single-switch high-gain boosting DC (direct current) / DC converter has the advantage of higher stable voltage gain, and is suitable for raising lower voltage to the higher voltage in a new-energy power generation system.

Description

technical field [0001] The invention relates to the technical field of DC / DC converters, in particular to a single-switch high-gain step-up DC / DC converter. Background technique [0002] In recent years, new energy has been widely researched and applied. In the new energy power generation system, the output of solar cells, fuel cells and supercapacitors is generally 24V / 48V DC. In order to realize the electrical connection between the new energy power generation system and the grid-connected system, A DC / DC converter is needed to raise the low DC voltage to a high DC voltage and then invert it into commercial power. However, the current wide range of traditional single-switch DC / DC converters, such as BOOST and secondary BOOST converters, have steady-state voltage gains of 1 / (1-D) and 1 / (1-D) 2 (D is the duty cycle). When the input voltage is low, a high duty cycle is required to achieve high-voltage output. However, when the duty cycle increases, the effective value of th...

AI Technical Summary

Problems solved by technology

When the input voltage is low, a high duty cycle is required to achieve high-voltage output. However, when the duty cycle increases, the effective value of the current of power semiconductor devices such as switching tubes increases, which requires the current stress of power semiconductor devices. High, and the duty cycle increases, which increases the conduction loss of the switch tube and reduces the efficiency of the converter

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