The Role of Film Capacitors in Filtering Circuits

There are many types and models of capacitors, and film capacitors are one of the them. Film capacitors have the characteristics of non-polarity, high insulation resistance, high voltage resistance, wide operating temperature range, and good self-healing properties, which are widely used in the electronics industry. Film capacitors are suitable for filter circuits due to their own advantages. Let's first understand what is filtering in the filter circuit.

Filtering is to filter unnecessary signal waves in the circuit and remove specific band frequencies in the signal in the circuit. It is a measure to suppress and prevent interference. In an AC circuit, there are AC voltage or current signals of various frequencies transmitted in the circuit, but some frequency signals are not what we need, and cause interference in the circuit. In order to remove these interference signals, we need to form a filter circuit.

The filter circuit allows signals in a certain frequency range to pass through without loss, while preventing signals in another frequency range from passing through. Using this filter circuit can extract useful signals.

This kind of circuit was first used in the field of communication. The reason why the film capacitor can be used in this kind of circuit is that it can remove the ripple in the voltage in the filter circuit, absorb the peak of the voltage, and remove the valley of the voltage. That is what is mentioned above: passing signals in a certain frequency range while blocking signals in a certain frequency range.

It should be noted that when the film capacitor is used in the filter circuit, it is necessary to pay attention to the frequency of the ripple in the filter circuit, the milliamp of the ripple current, the volts of the DC voltage, the size of the AC voltage, and the specification and model of the film capacitor. There are many, not all of them can be used in the filter circuit, so it is necessary to choose the appropriate film capacitor.

If you don't know how to choose a film capacitor, you can hand it over to the film capacitor manufacturer to provide you with a suitable solution.

We're JYH HSU (JEC) Electronics Ltd, one of largest manufacturers in China in terms of yearly safety capacitor (X2, Y1, Y2) production. Welcome to contact us if you need electronic components. Our website: https://www.jeccapacitor.com/

Thermistor Used in Electric Heating Uniform

Thermistors are a type of sensitive components, which are divided into positive temperature coefficient thermistors (PTC) and negative temperature coefficient thermistors (NTC) according to different temperature coefficients. NTC thermistors are used in different fields, so what is the application of thermistors in electric heating clothing? Read this article to better understand the use of thermistors.

Thermistor Features:

①Small size, fast response

②Able to accurately test the temperature change.

③Wide operating temperature range, good stability and reliability.

④Easy to install and use, the sealing can be done according to the environment and conditions of the customer's application.

The principle and structure of electric heating clothing: place a low-voltage power supply electric blanket-type clothing lining on the inner layer of the clothing, and install a carbon fiber heating wire group, a detachable lithium-ion rechargeable battery, a temperature controller, a waterproof type magnetic buckle power switch and NTC thermistor. One end of the carbon fiber heating wire set is connected to a lithium-ion rechargeable battery, the other end is connected to a temperature controller, and the middle is connected in series with a magnetic button power switch and an NTC thermistor. When the user turns on the magnetic button power switch on the electric heating clothing, the carbon fiber electric heating wire group will generate a heating effect through the current, so that the clothing has the function of heating and keeping warm.

The above content is about how thermistor works in electric heating clothing. We're JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer.Our factories are ISO 9000 and ISO 14000 certified. If you have technical questions or need samples, welcome to contact us. https://www.jeccapacitor.com/

Film Capacitor or Electrolytic Capacitor for EVs?

Common means of transportation in cities are bicycle, e-bikes, buses and subways, etc. Some people buy cars for convenience. Although cars are fast and convenient, they also have disadvantages: the fuel used is more expensive, and the exhaust gas emitted by cars is harmful, which is not friendly to people and the environment. The global warming caused by the global warming effect is related to the exhaust fumes emitted by automobiles. In order to solve this problem, new energy vehicles were born. With their advantages such as low price, environmental protection, energy saving, and easy maintenance, they are a better choice for many people to buy cars.

There is an important component in electric vehicles: capacitor. Capacitor, as one of the three major passive devices, is an indispensable and important component of the hardware circuit of electronic equipment. With energy storage function, it is an electronic component composed of two insulated conductors and an insulating dielectric that are close to each other.

Capacitors are generally used in three places in a car: energy storage, motor and electronic control. Basic functions such as filtering, absorption and resonance of capacitors help build the core electronic control system of new energy vehicles. Capacitors used in new energy vehicles include electrolytic capacitors and film capacitors.

In the power supply of electric vehicles, it is necessary to use high withstand voltage capacitors for smoothing and filtering. The interior of the car usually has a harsh working environment, requiring capacitors with high temperature resistance, high reliability, and long service life.

Both electrolytic capacitors and film capacitors are used in electric vehicles, so which one of them is more suitable for electric vehicles?

Film capacitors have a wide operating temperature range, generally -40°C~+105/110°C, and have good temperature characteristics, and can be used normally no matter it is cold or hot. However, electrolytic capacitors are more sensitive to temperature. If the temperature is too high or too low, the capacitance will decrease, the working time will be shortened, and in severe cases, it will be damaged.

This is why film capacitors are more suitable for electric vehicles than electrolytic capacitors.

We're JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.), an electronic components manufacturer. Our factories are ISO 9000 and ISO 14000 certified. If you have technical questions or need samples, please contact us: https://www.jeccapacitor.com/

 Why Should Be Careful of Cheap Film Capacitors

 

Electronic products are composed of different electronic components, and the electronic components that make up electronic products include transistors, diodes, capacitors, resistors, potentiometers, radiators, etc. These electronic components form the majority of electronic product categories. Different brands and different models have different functions and prices, but as the saying goes, you get what you pay for, and the quality of electronic products with high prices is usually better than those with low prices. The same is true for electronic components. If low-priced electronic components want to make a profit, they can only reduce the cost of materials. If the cost is low, the quality will be poor.

 

Film capacitors in electronic components have high insulation resistance, wide frequency response, non-polarity, wide temperature range, high withstand voltage, etc. They are widely used in the electronic field, such as household appliances like air conditioners, refrigerators, washing machines, etc. Almost every family will buy it, and the market space is huge. In order to make money, many unscrupulous businesses reduce costs and produce low-quality film capacitors for sale.

 

Inferior film capacitors have low production cost, poor quality, low insulation resistance, large dielectric loss, and are not resistant to high temperature and high voltage. When the temperature is high, the use time of inferior film capacitors will be shortened greatly, and they will be easily damaged. When used in electronic products, problems will easily occur, and the life time of electronic appliances may also be shortened. In severe cases, electronic products will explode and cause fires.

 

Therefore, when purchasing film capacitors, you should shop around to choose suitable and high-quality film capacitors. JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) is an electronic components manufacturer whose factories are  ISO 9000 and ISO 14000 certified. Feel free to contact us if you need. Welcome to visit our official website: https://www.jeccapacitor.com/

Application of NTC Thermistor in Mobile Phone Charger 

Do you know what else is in the mobile phone charger besides the necessary rectification circuit? There are thermistors, electrolytic capacitors, filter circuits, transformers, buffer circuits, ICs, etc. in the mobile phone charger.

After the mobile phone charger is powered on, the 220V AC (Chinese household voltage) is rectified by the full bridge and then output to the mobile phone circuit. However, the equivalent resistance of the capacitor at the moment of power-on is very small, and the current in the circuit is too large, which is prone to surge current. The generation of inrush current has a great impact on electronic equipment, which may lead to a decrease in the performance of electronic equipment and shorten the use time, and even more, the electronic equipment is prone to failure and damage.

 

In order to suppress the surge current generated in the electronic circuit at the moment of starting up and reduce the damage of the surge current to the electronic equipment, an NTC thermistor is usually connected in series in the power circuit.

 

NTC thermistor is a negative temperature coefficient thermistor whose resistance value decreases with the increase of temperature. When the circuit is not working, the resistance value of the NTC thermistor is very high at room temperature. At the moment when the switch is started, the capacitor charging generates a large current, but due to the existence of the NTC thermistor, the excessive current is limited and the inrush current is effectively suppressed. When the circuit runs for a period of time, the temperature rises, and the resistance value of the NTC thermistor drops to a small value as the temperature rises. At this time, the power consumed by the NTC thermistor can be ignored, and it will not affect the normal operating current of the circuit.

 

The NTC thermistor can effectively suppress the inrush current when starting up. Therefore, the use of NTC thermistors in the power circuit is a simple and effective measure to suppress the startup surge current and ensure that electronic equipment is not damaged.

 

In order to effectively suppress the inrush current when the circuit is powered on, it is necessary to ensure that the NTC thermistor used in the power circuit is of high quality. JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) is an electronic components manufacturer whose factories are  ISO 9000 and ISO 14000 certified. Visit JEC website: www.jeccapacitor.com

 What are Active Components and Passive Components

The beginning of the 21st century is a period of explosion of electronic products. Electronic products such as mobile phones, MP3, MP4, and cameras basically appeared at that time. With the continuous development of the times and the advancement of technology, more and more electronic products Products have entered people's sight, and the appearance of these electronic products has greatly facilitate people’s life and change people’s living style.

Electronic products are composed of different electronic components. Electronic components are divided into active components and passive components. So what are active and passive components? What's the difference between them?

Active components: When electronic components work, there is power inside them. Passive components: When electronic components work, there is no power inside them. 

Simply put, a device that requires power to function properly is an active component. A device that does not require a power source to function properly is a passive device.

Common active components include transistors, integrated circuits, and more. Active components are the core of electronic circuits, and all oscillation, amplification, modulation, demodulation, and current conversion are inseparable from active components.

Passive components include capacitors, resistors, etc.. Resistors mainly play the role of limiting current, shunting, stepping down, and dividing voltage in the circuit. Capacitors are indispensable components in the field of electronic power. They are mainly used in power supply filtering, signal filtering, coupling, resonance, and DC blocking in circuits.

Active devices and passive devices have different requirements on the working conditions and working methods of the circuit, but they are all part of the electronic product. Without one of them, the electronic product is incomplete.

Select a reliable manufacturer when purchasing electronic components can avoid a lot of unnecessary trouble. JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) is one of largest manufacturers in China in terms of yearly safety capacitor (X2, Y1, Y2) production. Welcome to contact us: https://www.jeccapacitor.com

 Hybrid of Supercapacitor and Lithium Battery

At present, the energy storage devices that can provide electric energy for electronic products on the market mainly include batteries and capacitors.

Supercapacitors and batteries can store a large amount of electric energy and can be used as power supply sources. Batteries are very common in life, whether it is computers, remote controls, or toys, most of them use batteries to provide energy to run, and the commonly used batteries are lithium batteries. Compared with other capacitors, supercapacitors have a large electrostatic capacitance, but there is still a gap compared with lithium batteries.

Although supercapacitors are not as good as lithium batteries in terms of power, the charging speed of supercapacitors is faster than that of lithium batteries. Supercapacitors have no chemical reaction during energy conversion and they charge and discharge quickly, but their energy density is much lower than that of lithium batteries. Lithium batteries store energy in a chemical form, and there is a chemical reaction during energy conversion. Its energy density is high, but the charging speed of lithium batteries is quite slow.

Lithium batteries can only maintain a good working condition within a limited number of charge and discharge times. Once the number of charge and discharge times is exceeded, the performance of lithium batteries will be greatly reduced, while supercapacitors can be repeatedly charged and discharged tens of thousands of times to hundreds of thousands of times. This is also the advantage of supercapacitors.

They can be combined to use their strengths to complement each other's weaknesses. One electronic component that offers the best of both worlds is the hybrid supercapacitor. Hybrid supercapacitors offer the best of both worlds, storing more energy than conventional supercapacitors while maintaining charging speed. Although hybrid supercapacitors are not popular yet, it is believed that with the development of technology, hybrid supercapacitors will become commonly used electronic components in the near future.

JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) is one of largest manufacturers in China in terms of yearly safety capacitor (X2, Y1, Y2) production. Our factories are ISO 9000 and ISO 14000 certified. If you're looking for electronic components, welcome to visit our official website: https://www.jeccapacitor.com