Low voltage stress and low input current ripple high gain converter and control method

Abstract

In the converter disclosed by the invention, the positive pole of the DC power supply is connected to the positive pole of the input filter capacitor and one end of the first and third inductors; the other end of the first inductor is connected to the drain of the first switch tube, the anode of the first diode, and the negative pole of the first capacitor; The other end of the three inductors is connected to the drain of the second switch tube, the anode of the second diode, and the cathode of the second capacitor; the anode of the first capacitor is connected to the anode of the third diode and one end of the second inductor; the cathode of the third diode is connected to the first The anode of the output filter capacitor and one end of the DC load; the cathode of the first output filter capacitor is connected to the other end of the second inductor, the cathode of the fourth diode, and the anode of the second output filter capacitor; the anode of the second capacitor is connected to the anode of the fourth diode and the anode of the fourth diode. One end of the inductor; the negative electrode of the second output filter capacitor is connected to the other end of the fourth inductor, the positive electrode of the third output filter capacitor, and the cathodes of the first and second diodes; the other end of the DC load is connected to the negative electrode of the input filter capacitor, the negative electrode of the third output filter capacitor, the first and second diodes The source of the two switch tubes and the negative pole of the DC power supply.

Description

technical field [0001] The invention belongs to the technical field of DC-DC boost converters, and in particular relates to a low voltage stress and low input current ripple high gain converter and a control method. Background technique [0002] In recent years, non-isolated high-gain converters have been widely used in uninterruptible power systems, renewable energy systems, fuel cells, and hybrid vehicles. In these cases, high-gain converters generally need to have the following characteristics: (1) high voltage gain, sometimes even more than 10; (2) ability to withstand large currents; (3) low input current ripple; ( 4) Under the required volume and quality, it has higher efficiency. [0003] To obtain higher voltage gain, the traditional boost converter needs to work under a very large duty cycle. This produces severe diode reverse recovery losses and EMI, and the system's dynamic characteristics deteriorate. Moreover, under the condition of high duty cycle, the avera...

AI Technical Summary

Problems solved by technology

However, like the traditional Boost converter, the current stress and volume of the input inductor are still large, and the power devices are under high voltage stress, making it difficult to further improve the system efficiency

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