Application Cases

With the rapid development of modern electronic technology and ultra-high/extra-high voltage technology, high-performance insulating materials are increasingly widely used in electronic devices and high-voltage power equipment. Polyimide (PI), as a polymer material with excellent electrical properties, high-temperature stability, chemical stability, and relatively high hydrolysis resistance, is widely applied in fields such as high-temperature electronic components, high-voltage power equipment, and aerospace electrical and electronic engineering. However, in practical applications, polyimide films are prone to accumulating space charges under strong electric fields, leading to electric field distortion and, in severe cases, breakdown, which significantly limits their application in high-voltage power equipment and related fields. Studying the space charge effects and breakdown characteristics of polyimide films under high electric fields is of great significance for understanding their breakdown mechanisms, improving their breakdown performance, and enhancing the reliability of electronic devices.

The Aigtek ATA-7000 series high-voltage amplifiers can provide a low-frequency high-voltage environment suitable for polyimide testing and are ideal for building test platforms. Additionally, they can output stable arbitrary waveforms to accommodate various breakdown experiments.

Experiment Name: Study on Space Charge and Breakdown Characteristics of Nano-Modified Polyimide Films Under Strong Electric Fields

Experimental Principle:
The principle is based on the interaction between the acoustic field and the electric field in dielectric materials. When the Coulomb force induced by a pulsed electric field acts on the charges within the dielectric material, it generates a pulse in the form of an acoustic wave. This wave is detected by a piezoelectric sensor and converted into a voltage signal. By measuring the amplitude of the pulse and the time at which the piezoelectric sensor receives the acoustic signal, the position and magnitude of the space charge distribution can be determined.

Experimental Block Diagram:

Experimental Setup Image:

Experimental Procedure:
The piezoelectric sensor, a device that transmits signals via acoustic waves, is used to detect and reflect the pressure waves containing information about space charge distribution. The weak voltage signal output by the piezoelectric sensor is amplified and then collected and tested by an oscilloscope. The signal generator produces an excitation signal, which is amplified by the high-voltage amplifier to provide a DC polarization electric field for the PI film sample. This setup is used to study the space charge distribution within the sample under a specific DC electric field. When the sample experiences insulation breakdown or surface flashover, the protective resistor limits the current to prevent damage to the high-voltage amplifier due to excessive current.

Experimental Results:
When a voltage is applied across the PI film, the injection and drift of charges within the film cause significant changes in its internal space charge distribution. Positive and negative charges of different magnitudes are injected at the anode and cathode, respectively. As the duration of the externally applied voltage increases, charge injection within the PI film continues, eventually leading to a gradual stabilization of the accumulated space charge.

Role of the High-Voltage Amplifier:
As the core component of the entire experiment, the high-voltage amplifier provides adjustable DC voltage signals ranging from 0 to 10 kV, applying a DC polarization electric field to the polyimide film.

Recommended High-Voltage Amplifier: ATA-7000 Series High-Voltage Amplifier

Figure: ATA-7000 Series High-Voltage Amplifier Specifications

Application Areas: Electrical and Electronic Engineering, Aerospace, Flexible Electronics

Application Scenarios:
Slot insulation and cable wrapping materials for motors, solar cell substrates, aerospace and rocket components, high-temperature dielectric filtration materials, bulletproof and fire-resistant fabrics, gas separation membranes, battery separators, tissue scaffolds, and other high-tech fields, as well as electrical equipment, microelectronics, flexible electronics, and new energy fields.

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