LCL filter with coupled inductors

A technology of coupling inductors and filters, applied in the field of power electronic device design, can solve the problems of increasing switching loss of power devices and affecting system efficiency, etc.

Inactive Publication Date: 2014-06-11
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

People usually use the method of increasing the frequency to reduce the volume and weight of the magnetic parts and the system, but increasing the frequency will increase the switching loss of the power device and affect the system efficiency. Therefore, the researchers also study the application of magnetic integration technology, without changing the frequency. Under the condition, continue to optimize the performance of the magnetic parts

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  • LCL filter with coupled inductors
  • LCL filter with coupled inductors
  • LCL filter with coupled inductors

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Embodiment Construction

[0036] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention will be further described below in conjunction with the accompanying drawings and test examples.

[0037] The two inductive coupling of the LCL filter and the forward series method are as attached Figure 4 , the equivalent circuit obtained by mutual inductance cancellation method is shown in the attached Figure 5 , low frequency, high frequency equivalent circuit as attached Figure 6 , 7 . attached Figure 9 It is the simulated amplitude-frequency characteristic graph when the two inductors have no coupling and in-phase coupling without offsetting inductance. Attached Figure 10 , 11 They are the LCL two inductors wound with ferrite cores without coupling and the same direction coupling, and the results obtained through the test of the network analyzer. The wound AC voltage side inductance , rectifier or inverter side inductance , filter ...

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Abstract

The invention discloses an LCL filter with coupled inductors and belongs to the field of design of power electronic devices. The input end of an alternating-current voltage side inductor of the filter is connected with an alternating-current voltage source, a counteracting inductor is connected with the output end of the alternating-current voltage side inductor in parallel after being connected with a filtering capacitor in series, a damping resistor can be connected with the filter capacitor in series or in parallel, or the damping resistor can be not adopted, the alternating-current voltage side filtering inductor and a rectification or inversion side filtering inductor are coupled and connected in series in the forward direction, and the output end of the rectification or inversion side filtering inductor is connected with a middle point of a rectification or inversion bridge arm. According to the LCL filter with the coupled inductors, not only can the size of the filter be reduced, but also the filtering effect can be improved.

Description

technical field [0001] The invention relates to an LCL filter using coupling inductance suitable for single-phase, three-phase or multi-phase rectification and inverter circuits, belonging to the field of power electronic device design. Background technique [0002] In switching power supplies, magnetic devices (abbreviated as magnetic parts, such as inductors and transformers) are important components. It plays the role of electric energy storage, conversion, electrical isolation and so on. According to statistics, the weight of magnetic parts is generally 30-40% of the total weight of the entire device, and the volume accounts for 20-30% of the total volume. Even higher. People usually use the method of increasing the frequency to reduce the volume and weight of the magnetic parts and the system, but increasing the frequency will increase the switching loss of the power device and affect the system efficiency. Therefore, the researchers also study the application of magn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03H7/09H02M1/12
Inventor 陈乾宏刘航
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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