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A Bidirectional DC Converter Based on Shifted Full Bridge and Synchronous Rectification

A bidirectional DC conversion and synchronous rectification technology, which is applied in conversion devices and instruments for converting DC power input into DC power output and output power, can solve the problems of increasing driving signals, low conversion efficiency, and increasing control difficulty, and achieves The effect of reducing power loss, reducing losses, and improving efficiency

Inactive Publication Date: 2017-08-04
NANJING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Traditional medium and high-power bidirectional DC converters have diverse topologies, but they all face the problem of low conversion efficiency due to large currents. If synchronous rectification is used to reduce the loss of freewheeling tubes, the drive signal will be increased, making control difficult increase again

Method used

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  • A Bidirectional DC Converter Based on Shifted Full Bridge and Synchronous Rectification
  • A Bidirectional DC Converter Based on Shifted Full Bridge and Synchronous Rectification
  • A Bidirectional DC Converter Based on Shifted Full Bridge and Synchronous Rectification

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Embodiment Construction

[0022] combine figure 1 , a bidirectional DC converter based on shifted full bridge and synchronous rectification, the full bridge conversion circuit on the high voltage side of the transformer includes: the output voltage V in Parallel filter capacitor Ci, the output voltage V inOne end is respectively connected to the drain of the first power switch tube Q1, the cathode of the first diode D1, one end of the first capacitor C1, the second power switch tube Q2, the cathode of the second diode D2, and one end of the second capacitor C2 The anode of the first diode D1 and the other end of the first capacitor C1 are connected to the source of the first power switch Q1, the source of the first power switch Q1 is also connected to one end of the ninth capacitor C9, and the ninth capacitor The other end of C9 is connected to the gate of the first power switch tube Q1, and the gate of the first power switch tube Q1 is respectively connected to one end of the first forward switch and...

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Abstract

The invention provides a two-way direct-current converter based on a phase-shifted full bridge and synchronous rectification. The converter comprises a full-bridge conversion circuit on the high-voltage side of a transformer, and a push-pull circuit on the low-voltage side of the transformer, wherein a first forward direction auxiliary switching circuit is arranged between a first power switch tube and a second power switch tube of the full-bridge conversion circuit, and a second forward direction auxiliary switching circuit is arranged between a third power switch tube and a fourth power switch tube of the full-bridge converting circuit; a reverse direction auxiliary switching circuit is arranged between a fifth power switch tube and a sixth power switch tube of the push-pull circuit. The two-way direct-current converter based on the phase-shifted full bridge and synchronous rectification is high in power density, small in loss of an output end rectification tube, stable in input and output direct-current voltage, high in reliability, stable in performance and capable of achieving two-way circulation of power.

Description

technical field [0001] The invention belongs to power electronic conversion technology, in particular to a high-frequency isolated bidirectional DC converter based on shifted full bridge and synchronous rectification. Background technique [0002] A bidirectional DC converter (BDC) is a bidirectional direct-to-direct converter that changes the direction of the current according to specific needs while maintaining the polarity of the input and output voltages to achieve dual-quadrant operation. Bidirectional transmission of energy is realized to the DC / DC converter. At present, bidirectional DC conversion has been more and more applied in the charging and discharging of batteries, electric vehicles, uninterruptible power supply systems, power systems, aviation power systems, etc. [0003] In fact, to achieve bidirectional energy transmission, it is also possible to connect two unidirectional DC / DC converters in antiparallel. Since diodes are generally required in the main po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335
CPCY02B70/10
Inventor 刘孟季伟伟都洪基吴彤王雨杰周文龙钱苏华杨斌柯仲来奚颖
Owner NANJING UNIV OF SCI & TECH
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