Power module switching voltage measuring method based on fringe electric field

A technology of power modules and fringe electric fields, which is applied in the direction of measuring current/voltage, measuring devices, measuring electrical variables, etc., can solve the problem of inaccurate measurement of device switching characteristics, improve reliability and integration, and reduce external influences.

Pending Publication Date: 2022-07-22
HEBEI UNIV OF TECH
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Problems solved by technology

[0004] Aiming at the related problems of integrating the voltage sensor in the power module, the present invention proposes a switching voltage measurement method based on the fringe electric field principle suitable for power module integration, aiming at improving the power density and reliability of the module while solving the existing problems The problem that the voltage measurement method is not accurate enough to measure the switching characteristics of the device

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  • Power module switching voltage measuring method based on fringe electric field
  • Power module switching voltage measuring method based on fringe electric field
  • Power module switching voltage measuring method based on fringe electric field

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Embodiment Construction

[0021] The present invention is further explained below with reference to the embodiments and accompanying drawings, but this is not intended to limit the protection scope of the present application.

[0022] At present, the measurement of the switching voltage of power electronic devices is mainly completed by the oscilloscope probe. This measurement method requires the direct electrical connection of the oscilloscope probe and the circuit under test, which will introduce additional capacitance and inductance to the circuit under test, resulting in a certain intrusion. The measured signal is delayed, and the oscillation phenomenon of the signal is exacerbated, which affects the accuracy of the measurement result. The influence of the voltage probe on the switching voltage waveform of the device is as follows: figure 1 shown.

[0023] figure 2 This is a schematic diagram of parallel plate capacitors. As the most common and common capacitors, parallel plate capacitors are wid...

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Abstract

The invention relates to a power module switching voltage measuring method based on a fringe electric field, the measuring method comprises a fringe electric field sensor and a signal processing circuit, the fringe electric field sensor is integrated in a power module, the signal processing circuit is arranged outside the power module, and the fringe electric field sensor comprises an electrode layer. The electrode layer comprises a driving electrode, a sensing electrode and a shielding electrode, the driving electrode is connected with a voltage signal of a device to be measured in the power module, and a fringe electric field can be formed between the sensing electrode and the driving electrode to sense the electrode of the measured voltage signal; the shielding electrode is used for shielding electric field signal interference except an induction area in the power module; the signal processing circuit is connected with an induction electrode in the fringe electric field sensor, and the fringe electric field sensor is used for sensing a voltage signal to be measured. While the power density and reliability of the module are improved, the problem that an existing voltage measurement method is not accurate enough in device switching characteristic measurement is solved.

Description

technical field [0001] The invention belongs to the field of voltage sensing, and in particular relates to a method for measuring switching voltage of a power module based on a fringe electric field, which is used for measuring the switching voltage in a power module package. Background technique [0002] With the increasing demand for high power density and high integration in power electronic systems, the research and development of integrated sensors has been pushed to a new height. At present, there have been typical researches on the integrated current sensor, while the integrated voltage sensor has not yet formed a systematic research. Existing voltage sensors mainly measure discrete power devices, and lack measurement methods that can be integrated into power modules. [0003] Common voltage sensors include voltage probes and circuit voltage sensors. Among them, oscilloscope voltage probes are widely used in the measurement of device switching voltage information, ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00G01D5/24
CPCG01R19/0084G01D5/24
Inventor 辛振白月刘新宇
Owner HEBEI UNIV OF TECH
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