Clamping three-level boost power conversion circuit

Abstract

The invention provides a clamping three-level boost power conversion circuit which comprises a power supply, an inductor, a first switch module, a second switch module, a first unidirectional conducting device, a second unidirectional conducting device, a third unidirectional conducting device, a fourth unidirectional conducting device, a fifth unidirectional conducting device, output upper bus capacitor, an output lower bus capacitor and a load unit. According to the invention, the fourth unidirectional conducting device and the fifth unidirectional conducting device form a clamping module for the voltage equalization of the first unidirectional conduction device D1 and the second unidirectional conducting device D2 and the voltage equalization of a first switching module T1 and a secondswitching module T2; the problem of overvoltage breakdown of a semiconductor device is avoided; and since the input and output are common ground systems, the problem of common-mode interference in a traditional three-level Boot topology is solved.

Description

technical field [0001] The present application relates to the technical field of a three-level boost power conversion circuit, in particular to a clamping type three-level boost power conversion circuit. Background technique [0002] Boost circuit generally refers to a step-up power conversion circuit, that is, through this circuit, a voltage is input and a higher voltage is output, and then power conversion is realized. Generally, the input that is greater than or equal to three levels is called multi-level. Boost circuit. Under the same input conditions, the multi-level Boost circuit can achieve a higher level of voltage output with a device of a smaller withstand voltage level by reducing the voltage stress of the power device. Compared with the traditional two-level Boost circuit, the multi-level Boost circuit can achieve medium-voltage high-power output. [0003] Two-level Boost circuit such as figure 1 As shown, when applied in the case of medium voltage and high po...

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Problems solved by technology

[0005] The present invention provides a clamping type three-level step-up power conversion circuit, which can solve the problem of uneven voltage in series use of devices existing in the prior art and the common potential caused by the positive and negative of the power supply and the positive and negative of the bus bar. mode interference problem

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