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Bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter

A modular multi-level, DC converter technology, applied in the direction of converting DC power input to DC power output, adjusting electrical variables, instruments, etc., can solve the problems of not being able to adapt to working conditions and high temperature, and achieve adjustability, Small inductance reduces switching noise

Active Publication Date: 2015-05-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the temperature of the working environment of electric vehicles is high, and traditional converters containing inductive components are far from being able to adapt to this working condition

Method used

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  • Bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter
  • Bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter
  • Bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter

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Embodiment Construction

[0032] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0033] refer to figure 1 , figure 1 A structural schematic diagram of a bidirectional resonant bridge modular multilevel switched capacitor DC-DC converter provided for the present invention, including a high-voltage side DC voltage source V H , switched capacitor module, resonant inductor L r , H bridge circuit, low voltage side capacitor C 5 , low voltage side DC voltage source V L . The "1" terminal of the switched capacitor module is connected to the positive pole of the high-voltage side DC voltage source, the "2" terminal is connected to the negative pole of the high-voltage side DC voltage source, the "3" terminal is connected to the "3" terminal of the H-bridge circuit, and the "5" terminal is connected to the "3" terminal of the H-bridge circuit. The terminal is connected to the "5" terminal of the H bridge circuit, and the "6" terminal...

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Abstract

The invention discloses a bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter which sufficiently uses stray inductance of circuits to serve as resonance oscillation and can achieve level extension easily through an extension switched capacitor module. Bidirectional energy flow between the high voltage side and the lower voltage side and regulation of output voltage are achieved through phase-shifting control of a switch tube. In the boosting state, the bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter can output input voltage of 2-4 times; in the depressurization state, the bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter can output input voltage of 0-0.5 time. The bidirectional-resonance bridge type modular multi-level switched capacitor DC-AC converter is simple in control, solves the problems that output voltage of the traditional switched capacitor is difficult to regulate, bidirectional energy flow is hard to control and peak currents of the working circuits are large, and improves efficiency and power density of the converter; is mainly applied to occasions where bidirectional energy flow, high efficiency and large power are required, such as micro-grid and electromobile motor drive.

Description

technical field [0001] The invention relates to a bidirectional resonant bridge type modularized multilevel switched capacitor DC-DC converter. Background technique [0002] Traditional DC-DC converters contain inductive components, which are difficult to integrate and have great bottlenecks in efficiency and power density. Switched capacitor converters (SCC) remove magnetic components such as inductors and transformers, and rely on their light weight, small size, and EMI Low power, high power density, easy integration and other advantages are widely used in more and more occasions. However, traditional switched capacitor converters generally have discontinuous input current, electromagnetic interference (EMI) problems caused by excessive di / dt, and large voltage spikes, which greatly limit the application of switched capacitor technology in high-power fields. Therefore, it is proposed to use the stray inductance in the circuit as the resonant inductor to resonate with the ...

Claims

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Application Information

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IPC IPC(8): H02M3/335
CPCH02M3/33569H02M3/33584
Inventor 何良宗丁烨程琛
Owner XIAMEN UNIV
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