Polyester Film Capacitor Polarity

Polyester film capacitor polarity, a synthetic fluoropolymer and hydrophobic solid fluorocarbon, is used as the dielectric in polytetrafluoroethylene film capacitors. Although poor adhesion to the film makes metallization challenging, they are produced both as metallized and film/foil varieties. The DuPont brand Teflon is widely used to refer to PTFE.

With a voltage derating, polytetrafluoroethylene film capacitors have extremely high temperature resistance up to 200 °C and even higher up to 260 °C. The dissipation factor is just 2 • 10 4. Comparatively to polypropylene film capacitors, the change in capacitance across the full temperature range of +1% to -3% is a little bit larger. The least obtainable film thickness for PTFE films, however, is 5.5 m, or almost twice as thick as polypropylene films.

Feature of polyester film capacitor polarity:

1.Non-inductive construction
2.Self-healing
3.High-property moisture resistance
4.High capacitance value available and compact size

Application of polyester film capacitor polarity:

1.Coupling decoupling by-passing and timing circuit
2.Automatic control systems, communication equipment
3.Charging/discharging, lighting, noise suppression and frequency modulation

Specifications:

Dielectric: Polyester film

Electrodes: Vacuum evaporated metal

Capacitance tolerance: M=±20%, K=±10%, J=±5%

Dissipation factor (tangent of loss): C≤1.0uF DF ≤0.8%

C>1.0uF DF ≤1%  (at 20°C, 1kHz)

Voltage-proof: 1.6*UR Unit:VDC (5s at 20°C)

After the test: ∆C/C ≤8%, ∆DF≤0.30%(C>1 uF);

∆DF≤0.50%(C≤1 uF);

IR ≥0.5% of the specified value (20°C, 1kHz)

Main applications of polyester film capacitor polarity：

Polyester film capacitor polarity are mainly used in many industries such as electronics, home appliances, communication, electric power, electrified railroad, hybrid vehicles, wind power generation, solar power generation, etc. The steady development of these industries is driving the growth of the film capacitor market.

1) Application in power electronic circuits. Film capacitors are used to buffer and clamp power currents, resonant bypass and suppress electromagnetic interference from the power supply.

(2) When the film capacitor is used as a bypass, it mainly serves to reduce the impedance of the DC bus and absorb the ripple current from the load, so as to effectively suppress the fluctuation of the DC bus voltage due to sudden changes in the load.

(3) When the device is used in a resonant converter, it is able to achieve resonant function together with the inductor.