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/