A frequency multiplier boost circuit, its control method, and inverter

Abstract

The invention provides a frequency multiplier type booster circuit. The frequency multiplier booster circuit comprises a direct-current power supply, a first booster unit, a second booster unit and a control unit, wherein the input end of the first booster unit is connected with the positive electrode of the direct-current power supply; the negative electrode output end of the first booster unit is connected with the positive electrode output end of the second booster unit; the input end of the second booster unit is connected with the negative electrode of the direct-current power supply; the first booster unit and the second booster unit are used for improving the output voltage value of the frequency multiplier type booster circuit; and the control unit is used for respectively controlling the first booster unit and the second booster unit, so that the output voltage value of the first booster unit is equal to that of the second booster unit. Correspondingly, the invention provides an inverter comprising the frequency multiplier type booster circuit and a control method for the frequency multiplier type booster circuit. The frequency multiplier type booster circuit provided by the invention can reduce switching loss and working frequency, and can improve current ripple.

Description

technical field [0001] The present invention relates to the technical field of electronic power, in particular to a frequency multiplication boost circuit, an inverter including the frequency multiplication boost circuit, and a control method for the frequency multiplication boost circuit. Background technique [0002] Photovoltaic inverter is a device that converts light energy into electrical energy. Its efficiency directly affects the amount of grid-connected power generation, so it is the most critical part of photovoltaic power station power generation. In order to improve the efficiency of photovoltaic inverters, it can be achieved by reducing the loss of power devices, reducing the loss of filter inductors, and improving the efficiency of transformers. Among them, the efficiency of the transformer can only be improved through the use of new materials, new processes and other new technologies by the transformer manufacturer. Therefore, in order to improve the efficienc...

AI Technical Summary

Problems solved by technology

It can be seen that in order to improve the efficiency of the three-level inverter, the operating frequency of its boost circuit needs to be increased, so it is necessary to increase the operating frequency of the switching tube in the boosting circuit at the same time, but this will cause the switching tube to fail. A series of problems such as increased heat, increased current ripple in the circuit, and shortened device life. At the same time, because the switch tube always works at high frequency, the switching loss is serious, and even damage occurs, which affects the normal operation of the circuit.

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