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A mid-point voltage balancing method for a three-level full-bridge DC conversion device

A technology of DC conversion and DC input voltage, which is applied in the direction of converting DC power input to DC power output, output power conversion device, and adjusting electric variables, etc., which can solve the problem of high screening cost and workload, high cost of drive circuit transformation, and component failure. Consistency requirements are very high, to achieve the effect of easy implementation, reducing voltage stress, and ensuring voltage equalization

Active Publication Date: 2019-01-29
NO 719 RES INST CHINA SHIPBUILDING IND
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  • Description
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AI Technical Summary

Problems solved by technology

In high-voltage and high-power applications, the driving circuit of the switching device often adopts the standard mature and reliable circuit provided by the device supplier, and is integrated with the switching device with a fixed interface. The transformation cost is relatively high. In addition, there are many discrete components in the voltage equalizing circuit, which requires high consistency of components, and the screening cost and workload are relatively large.

Method used

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  • A mid-point voltage balancing method for a three-level full-bridge DC conversion device
  • A mid-point voltage balancing method for a three-level full-bridge DC conversion device
  • A mid-point voltage balancing method for a three-level full-bridge DC conversion device

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Embodiment Construction

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0034] figure 1 It is the main circuit diagram of the non-flying capacitor type three-level full-bridge DC conversion device used for control by the method of the present invention. Such as figure 1 As shown, the flying capacitor is canceled in this circuit, mainly including: the first input voltage dividing capacitor C in1 and a second input divider capacitor C in2 ; The first switching tube Q 1 , the second switching tube Q 2 , the third switching tube Q 3 , the fourth switching tube Q 4 , the fifth switching tube Q 5 , the sixth switching tube Q 6 , the seventh switching tube Q 7 and the eighth switching tube Q 8 ; The first rectifier diode D R1 , the second rectifier diode D R2 , the third rectifier diode D R3 , the fourth rectifier diode D R4 ; The first clamping diode D c1 , the second clamping diode D c2 , the third clamp...

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Abstract

The invention discloses a neutral-point voltage balancing method for a three-level full-bridge DC converting device. The method is implemented through the adjustment of the conduction time of an outer tube in the three-level full-bridge DC converting device according to the bias of an inputted capacitor voltage, and is also guaranteed through the control of the simultaneous conduction of the outer tube and an inner tube in series connection and the control of a time sequence that the outer tube is cut off before the inner tube. The method can save a flying capacitor in the three-level full-bridge DC converting device, can achieve the real-time voltage-sharing of a switching device and a voltage-dividing capacitor in the device through keeping a clamping diode, guarantees the neutral-point voltage balance, can meet the demands of a high-voltage occasion through selecting a low-voltage rated device, facilitates the improvement of the switching frequency of the device, and reduces the size, weight and cost.

Description

technical field [0001] The invention relates to a DC-DC power conversion device, in particular to a control method for an isolated three-level DC conversion device suitable for high-voltage and high-power applications. Background technique [0002] With the rapid development of new energy power generation, high-voltage DC transmission, ship electric propulsion, high-speed railway electrical and other related technologies, three-level full-bridge DC conversion devices suitable for high-voltage, electrical isolation, and high-power applications have attracted more and more attention. s concern. The three-level full-bridge DC conversion device adopts the series connection of low-voltage fast switching tubes, which solves the problems of high voltage stress of switching tubes, excessive loss, difficult selection of components, high cost, and low switching frequency in high-voltage and high-power applications. It improves the efficiency, power density and economy of power conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487H02M3/335
CPCH02M3/335H02M7/487
Inventor 姚川吴浩伟李鹏汪文涛金翔李小谦邓磊李锐蔡凯欧阳晖姜波李可维周樑金惠峰邢贺鹏徐正喜陈涛魏华罗伟雷秉霖张辉睿
Owner NO 719 RES INST CHINA SHIPBUILDING IND
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