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An isolated four-element resonant circuit and its control method

A resonant circuit and isolation technology, which is applied in the field of power electronic power conversion circuit, can solve the problems of transformer bias, output voltage or output current ripple, hiccup or skip cycle, etc., so as to avoid DC bias problem and reduce switching loss Effect

Active Publication Date: 2017-07-18
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing resonant circuit adopts the frequency conversion control method. In the frequency conversion control method, hiccups or cycle skipping operation modes are prone to occur under light loads. This operation mode is prone to large ripples in the output voltage or output current.
However, if the existing resonant circuit adopts the control method of changing the duty cycle, problems such as transformer bias may occur.

Method used

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  • An isolated four-element resonant circuit and its control method
  • An isolated four-element resonant circuit and its control method
  • An isolated four-element resonant circuit and its control method

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Embodiment Construction

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application. Apparently, the drawings are only embodiments of the present invention, and those skilled in the art can obtain other drawings according to the provided drawings without creative efforts.

[0037] The embodiment of the present application discloses an isolated four-element resonant circuit, the four elements resonate, and the resonant elements are respectively located on the primary side and the secondary side of the isolation device (that is, the transformer), which realizes the characteristi...

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Abstract

The invention relates to a power electronic electric energy conversion circuit, and aims to provide an isolated four-element resonant circuit and a control method. The circuit includes a rectifier circuit and a transformer, and also includes four resonant components composed of a first resonant inductance, a second resonant inductance, a primary side resonant capacitor and a secondary side resonant capacitor. The present invention realizes the characteristics of soft switching through four resonant elements, and reduces the switching loss of the circuit. Therefore, compared with the traditional PWM chopping conversion technology, the soft switching characteristics of the primary and secondary sides can be realized. Simultaneously, the resonant element of the four-element resonant circuit of the present invention is located on the primary side or the secondary side of the transformer, and the primary side and the secondary side of the transformer respectively have resonant capacitors, and the resonant capacitors have the function of blocking direct current, which can avoid the transformer under complementary driving control. Therefore, the resonant circuit of the present invention is suitable for various control methods such as frequency conversion control or complementary drive control.

Description

technical field [0001] The invention relates to a power electronic electric energy conversion circuit, in particular to an isolated four-element resonant circuit and a control method. Background technique [0002] Traditional PWM chopper converters, whose power components work in hard switching mode, have large switching losses and low efficiency, and it is difficult to increase the power density through high frequency. At the same time, the EMI characteristics are poor, and many filter suppression units need to be added. Increased costs and reduced efficiency. [0003] The resonant converter uses a resonant circuit to create soft switching conditions for power components and reduce switching losses. However, the existing resonant circuit adopts a frequency conversion control method. In the frequency conversion control method, hiccups or cycle skipping operation modes are prone to occur under light loads. This operation mode is prone to large ripples in output voltage or ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28
Inventor 吴新科
Owner ZHEJIANG UNIV
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