Symmetrical rectifying circuit having output current ripple cancellation function

A technology of output current and rectification circuit, which is applied in the direction of output power conversion device, DC power input conversion to DC power output, wind power generation, etc. It can solve the problems affecting the volume and loss of the output filter capacitor, so as to improve the overall conversion efficiency and Effects of power density, suppression of voltage parasitic oscillation, and reduction of withstand voltage level

Inactive Publication Date: 2009-08-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But in the case of high current, the output current ripple is still

Method used

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  • Symmetrical rectifying circuit having output current ripple cancellation function
  • Symmetrical rectifying circuit having output current ripple cancellation function
  • Symmetrical rectifying circuit having output current ripple cancellation function

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Embodiment Construction

[0019] The purpose and effects of the present invention will become more apparent by describing the present invention in detail below with reference to the accompanying drawings.

[0020] refer to Figure 4 , a symmetrical rectification circuit with output current ripple canceling function of the present invention, including a power transformer T with four secondary side windings, two flying balance capacitors C a1 and C a2 and two rectifier diodes D 1 and D 2 .

[0021] Power transformer T with four secondary windings, primary winding w P The same name terminal and the secondary side of the first winding w s1 and the fourth winding w s4 The end of the same name is in the same direction as the second winding w s2 and the third winding w s3 The reverse of the end of the same name. Define the terminal with the same name of the transformer winding as the positive terminal, and the other as the negative terminal, then the first winding on the secondary side w s1 The posi...

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Abstract

The invention discloses a symmetric rectifying circuit capable of counteracting output current ripples, which comprises a power transformer with four secondary side windings, two flying and balancing capacitors and two rectifier diodes. The symmetric rectifying circuit can effectively counteract the output current ripples by using the symmetric secondary side windings of the transformer and the flying and balancing capacitors without any additional active auxiliary element, so as to greatly reduce the capacitance value and volume of an output filter capacitor; and the symmetric rectifying circuit suppresses the voltage parasitic oscillation on a secondary side rectifying tube output junction capacitor, clamps the voltage stress of a rectifying tube at double output voltage, reduces the level of the withstand voltage of the rectifying tube and reduces the on-state loss of the rectifying tube. In addition, the effective reduction of the current in the secondary side windings of the transformer reduces the loss of the secondary side windings. Therefore, the symmetric rectifying circuit can effectively improve the overall conversion efficiency and the power density of the transformer while taking production cost into consideration.

Description

technical field [0001] The invention belongs to the field of DC / DC conversion and rectification, and relates to a rectification circuit capable of realizing output current ripple cancellation and low rectifier tube voltage stress. More specifically, the present invention relates to a rectifier circuit comprising a power transformer with four secondary side windings and two flying balance auxiliary capacitors. Background technique [0002] Full wave capacitive rectification circuit ( figure 1 ) is widely used in high-current output occasions due to its simple structure, low rectifier voltage stress, no output inductance loss, and easy realization of the soft-switching working environment of the rectifier. However, the high-frequency power transformer leakage inductance and lead inductance and the equivalent parasitic output junction capacitance of the secondary side rectifier can easily generate voltage parasitic oscillations during commutation, which increases the voltage s...

Claims

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Application Information

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IPC IPC(8): H02M3/24H02M1/14
CPCY02E10/76
Inventor 吴新科赵晨钱照明
Owner ZHEJIANG UNIV
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