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Real-time detection method and system for open-circuit fault of CLLLC resonant converter

A resonant converter and open-circuit fault technology, which is applied in the field of real-time detection of CLLLC resonant converter open-circuit faults, can solve problems such as low detection speed, high detection cost, and weak algorithm robustness, and achieve high detection accuracy and anti-interference The effect of strong ability but poor real-time performance

Active Publication Date: 2020-07-14
HUAZHONG UNIV OF SCI & TECH
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  • Claims
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a real-time detection method and system for an open-circuit fault of a CLLLC resonant converter, thereby solving the problem of low detection speed, weak algorithm robustness, and detection cost in the prior art. high technical issues

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  • Real-time detection method and system for open-circuit fault of CLLLC resonant converter

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Embodiment 1

[0062] The embodiment of the present invention takes the CLLLC resonant bidirectional DC / DC converter as an example to introduce in detail, as figure 2 As shown, the CLLLC resonant bidirectional DC / DC converter includes: power supply V in , load V o , four primary side power tubes S 1 , S 2 , S 3 , S 4 , four secondary side power transistors S 5 , S 6 , S 7 , S 8 , primary side resonant inductance L r1 , Secondary side resonant inductance L r2 , primary side resonant capacitor C r1 , Secondary side resonant capacitor C r2 and a transformer T r .

[0063] A method for real-time detection of an open-circuit fault of a CLLLC resonant bidirectional DC / DC converter, comprising:

[0064] Step 1. Use the photocoupler to obtain the voltage signals of the two lower tubes of the converter, and sample them to obtain V A , V B , the sampling period is T sp ;

[0065] Step 2. The voltage signal of the lower tube of the converter is a pair of complementary square waves, a...

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Abstract

The invention discloses a real-time detection method and system for open-circuit fault of a CLLLC resonant converter, which belong to the technical field of online detection. The method comprises thesteps of collecting a voltage signal of a converter, carrying out the sampling of the voltage signal, carrying out the discrete integration, and obtaining a voltage integral maximum value, calculatingan estimated value of a voltage integral maximum value by using the working frequency of a power tube in the converter and the DC bus voltage, and judging whether a power tube in the converter failsor not according to the difference between the voltage integral maximum value and the estimated value of the voltage integral maximum value. The method is suitable for detecting the open-circuit faultof the power tube in the CLLLC resonant bidirectional DC / DC converter controlled by frequency modulation, and has the advantages of low cost, high detection precision, high speed, high real-time performance, good robustness and strong anti-interference capability.

Description

technical field [0001] The invention belongs to the technical field of on-line detection, and more particularly relates to a real-time detection method and system for an open-circuit fault of a CLLLC resonant converter. Background technique [0002] With the rapid development of my country's new energy technology, more and more new energy vehicles appear, alleviating the increasing shortage of traditional energy. As one of the important modules of the new energy vehicle charging pile, the stability of the DC / DC converter will inevitably affect the reliability of the entire system operation. CLLLC resonant bidirectional DC / DC converter has the advantages of high efficiency, high power density, bidirectional operation and soft switching, and is widely used in various scenarios. Aiming at the open-circuit fault of CLLLC resonant bidirectional DC / DC converter, a real-time and effective diagnosis method is proposed, which has important engineering application value for improving...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/56G01R31/54
Inventor 赵金孙布衣吴祉汐
Owner HUAZHONG UNIV OF SCI & TECH
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