DMT4P1K-F

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Film capacitors use polyester, polypropylene, or in some cases polycarbonate as the dielectric material in a capacitor, and ohmic losses are minimized due to the low dielectric constant of these materials. For applications that require extreme capacitance stability over temperature, the choice of dielectric material is crucial as will be shown below.

The DMT4P1K-F is an ultra high-performance pulsed-discharge film capacitor from KEMET that offers superior performance versus aluminum electrolytic capacitors. The device is an ideal choice for applications requiring extremely stable capacitance, high dielectric strength and high energy storage. Specifically, the DMT4P1K-F is suitable for medium and high voltage DC link applications such as air conditioners, Uninterruptible Power Supplies (UPS), welding machines, and high-voltage power supplies.

The DMT4P1K-F is a unique design, featuring an optimized winding structure and sandwich structure with three shells with a polypropylene film. Its capacitance stability over temperature in a -40°C to +85°C temperature range is from 0% to 5%, much better than aluminum electrolytic capacitors. The DMT4P1K-F also offers excellent self-healing behavior with a dust resistance rating of 1.1x10⁻⁴¹ m⁻¹ in a range of temperatures from -30°C to +85°C. The electrical properties of the capacitor provide superior performance with minimized dissipation factor and good dielectric strength values.

The DMT4P1K-F has a slim design with a diameter of 34.5mm and a height of 66.33mm. It has a rated voltage of 1.25kV and can withstand higher pulse voltages up to 5kV. Other features include high pulse discharge power rating of 4.5 kJ/kV, low ESR values of 0.08 mΩ x µF and low rating losses of 2.2kJ/kV. In addition, the DMT4P1K-F contains an optimized winding structure to reduce shock currents.

The working principle of the DMT4P1K-F is based on the same principles as other capacitors, in that it stores electrical energy in an electrical field. When a voltage is applied to the plates of the device, an electric field is created between them, storing a charge. This charge causes a potential difference between the plates, which can be used to power electrical components.

The device operates by charging up when it receives a current input. The charge is then held in the capacitor until it is discharged via a control switch. This discharge can occur rapidly and creates a large voltage spike, which is especially useful in high-power surge applications or pulse applications. The capacitance of the device is set by its physical size and material, and is the amount of charge that can be stored on the plates.

To ensure reliable operation of the device it is important to use the recommended series of snap-on connectors, with suitable insulation. To prevent possible damage to the dielectric, a maximum voltage should be respected. The device is also susceptible to vibration, so mounted on a soft surface or vibration damping material, and avoid stress or distortion as these can lead to a decrease in performance.

In conclusion, the DMT4P1K-F is an excellent choice for application requiring extremely stable capacitance, high dielectric strength and high energy storage. It is a unique design with optimized winding structure, sandwich structure, and polypropylene film construction, with excellent self-healing behavior. It offers superior performance versus aluminum electrolytic capacitors, and has a slim design with low ESR and rating losses. Care must be taken to ensure reliable operation of the capacitor, and to prevent damage or poor performance.

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