What are PTFE capacitors? Why use it?
What are PTFE capacitors?
PTFE capacitor belongs to the organic film capacitor category. It is made of metal foil as the electrode and PTFE film as the medium. After winding and forming, it is sealed in the shell.
PTFE capacitor is also a high-performance capacitor. PTFE film has excellent insulation function, chemical stability and mechanical strength, which can be used to resist the influence of the external environment. In addition, PTFE membrane has excellent dielectric function and can maintain stable capacitance at high frequency. Also known as Teflon, it is a highly stable organic polymer.
The biggest feature of PTFE capacitors is that they can work at high temperatures. Generally, the range of working temperature is -55℃+200℃. Therefore, it is suitable for occasions with special requirements, such as AC and DC circuits and pulsation circuits of electronic equipment such as jet engines and radar transmitters.
Another feature is self-healing: when the capacitor is penetrated, the heat released during the breakdown vaporizes and evaporates the metal film around the breakdown point, thus forming an insulating area around the conductive point, and the capacitor can still work normally.
What is the working principle of PTFE capacitor?
The working principle of PTFE capacitor is that when voltage is applied between two conductive plates, an electric field will be generated in the PTFE membrane. Because PTFE membrane has a high dielectric constant, it can effectively store charge and maintain an electric field. The existence of this electric field enables capacitors to store electrical energy and release electrical energy when needed.
The low-loss characteristics of PTFE capacitors enable it to reduce energy loss in the process of electrical energy conversion and improve the efficiency of the equipment.
What are the advantages of PTFE capacitors?
I. Excellent high temperature resistanceAfter special process treatment, the PTFE capacitor has a high melting point and glass conversion temperature. It can maintain excellent electrical properties in high-temperature environments, is not easy to deform, soften and flow, and can also withstand large electric field strength.
PTFE capacitor has the characteristics of good chemical stability. It is not affected by chemical reactions. It can still work stably in harsh environments such as strong acid, strong alkali and high salinity. At the same time, it also has excellent anti-oxidation and anti-radiation performance.
The dielectric constant of PTFE capacitors is relatively small, the dielectric loss angle is low, and it has excellent capacitance stability, which can maintain the capacitance value stable in harsh environments such as high temperature, high frequency and high voltage.
Because PTFE capacitors have the characteristics of high strength, high rigidity, high toughness, etc., are not easy to damage or break, and will not produce polarization during use, so they have a long service life and high reliability, and are widely used in medical and communication fields.
Common types of PTFE capacitors
1. CCR/P series PTFE capacitor: suitable for wide temperature range, large capacity and high voltage application fields, such as electric vehicles, new energy charging piles, etc.
2 .ACR/P series PTFE capacitor: suitable for high-precision and high-reliability application fields, such as high-performance testing instruments, medical devices, etc.
Application of PTFE capacitors
1. Car electronic system: PTFE capacitors are widely used in car electronic systems, such as engine control, sensor interfaces and other fields because of their high temperature resistance and excellent electrical function.
2. Communication equipment: PTFE capacitors can be used in the power supply processing circuit of mobile phones, TVs and other communication equipment to interfere with the stability and reliability of the equipment.
3. Wearable devices: Due to its small size and light weight of PTFE capacitors, it can be used for wearable devices, such as smart bracelets, smart watches, etc.
4. LED lighting: PTFE capacitor discussion can be directly used in the driving control circuit of LED lighting system equipment, and the brightness and life of the lamp.
5. Aerospace field: PTFE capacitors are widely used in various high-performance electronic equipment in the aerospace field, such as star navigation equipment, satellite communication equipment, etc.
6. In the field of power electronics: PTFE capacitors have also been widely used in the field of power electronics, such as inverters, battery management systems, etc.
Installation Notes of PTFE Electric Vessel
1, before the PTFE electric container is used, the quality of the PTFE electric container should be checked to prevent the PTFE electric container that does not meet the requirements into the circuit.
2, when installing the PTFE electric container in the circuit, the mark of the PTFE electric container should be installed in an easy to observe position for checking and maintenance.
3, in the design of the installation of components, the PTFE electric container should be kept away from the heat source, otherwise the PTFE electric container temperature will be too high and premature aging.
Why is PTFE so good?
PTFE is widely used for the following reasons1. High dielectric constant and low loss: PTFE film has a high dielectric constant, generally between 50 and 100, which makes PTFE capacitor loss low and has a lot of equipment power.
2. Excellent temperature and chemical stability: PTFE film has excellent heat resistance and chemical resistance, and can maintain stable function in extreme temperature and chemical environment.
3. High mechanical strength and wear resistance: PTFE film has excellent mechanical strength and wear resistance, which can be used in harsh environments for a long time and is not easy to damage.
Power storage performance of PTFE
Experimental research shows that the supercapacitor electrode material prepared by PTFE has a high specific capacitance and has good cyclic stability. The main reasons are as follows:
1. Chemical inertness. PTFE is a chemically inert material that does not change acids, alkalis, organic matter, oxidants and reducing agents, so that it will not react chemically in the electrolyte and ensures the stability of the storage performance.
2. Extremely high specific surface area. PTFE has a large specific surface area, which improves the capacitance and facilitates the transmission of charge.
What is PTFE used for?
1. Anti-corrosion: PTFE material has been widely used in many industries such as petroleum and textiles due to its outstanding corrosion resistance. Among them, representative ones include exhaust pipes, steam pipes, high-level low-pressure pipes, valves, etc. Especially under relatively harsh environmental conditions such as low temperature and anti-sticking that conventional materials cannot be used, it reflects the advantages of PTFE.
2. Electronic and electrical aspects: The dielectric constant of PTFE is relatively small, so it can be used to prepare lacquered wires, so that it can be used in micro-motors. In addition, fluoroplastic film has a certain selective permeability to all kinds of gases, so this feature can be used to Prepare an oxygen sensor. Nowadays, various forms of PTFE materials play an important role in the field of electronic and electrical insulation. PTFE glass paint cloth and glass cloth are used to make high-temperature and high-frequency insulation materials, which can be used in satellite communications and computers; PTFE film is used to make capacitors as insulation layers, gaskets, cables, etc. between instruments; PTFE thin-walled tubes of different calibers are used for lead wire sleeves, heat-shrinkable tubes and screws respectively. Rotary tubes, insulated drainage pipes of generators, etc.
3. In terms of medical care: the excellent biocompatibility of PTFE. In recent years, many people have conducted in-depth research on it as a biological material. In recent years, PTFE membranes have been developed at home and abroad as artificial organs, such as artificial blood vessels, heart valves, etc., such as using it as artificial blood vessels and nasal plastic surgery in clinical practice. The prosthetic bracket materials have achieved good results.
4. In terms of construction: By coating PTFE resin on ultra-fine glass fiber fabric, PTFE membrane material is light in weight, high in strength, fireproof and flame retardant, good self-cleaning, not affected by ultraviolet rays, fatigue-resistant, distortion-resistant, aging-resistant, long service life, high light transmittance and very little heat absorption. It is precisely because of the invention of this era-crossing membrane material that membrane structure buildings have become modern permanent buildings.
