Why Shouldn't the Capacitance of Y Capacitors Too Large

Safety capacitors are divided into X capacitors and Y capacitors. They are often used together in the power supply section, that is, the yellow box electronic components and blue components commonly found in power supplies.

The X capacitor and the Y capacitor are not distinguished by the material of the capacitor, but by the position in the power supply circuit. According to the peak pulse voltage across the Y capacitor, the Y capacitor is divided into three grades: Y1 capacitor, Y2 capacitor, and Y3 capacitor. The Y3 capacitor usually has no specific parameters.

Y1 capacitor: high voltage resistance value> 8 kV;

Y2 capacitor: 5kV < high voltage resistance < less than 8 kV;

Y3 capacitor: 2.5 kV < high voltage resistance < less than 5 kV.

Why should Y capacitors be distinguished between these three levels? This is because when designing the circuit, it is necessary to select a Y capacitor with a suitable withstand voltage value according to the peak voltage in the power supply circuit. If the selected Y capacitor grade is not enough or the withstand voltage value is lower than the peak voltage of the power supply circuit, the Y capacitor will not be able to play the protective role.

Why Can't The Capacitance of The Y Capacitor Be Too Large?

In the front-end circuit of the switching power supply, the Y capacitor is usually connected to the two capacitors between the primary and the secondary side of the circuit, and can provide a return path for the interference current coupled from the primary side to the secondary side, which plays a role as EMC, and in EMC, the important parameter of capacitance is leakage current.

What is leakage current? In the EMI circuit, the switching power supply has a small current after being powered on, which is the leakage current. The leakage current is harmful to the human body, and the human body will feel numb when it touches the small leakage current. If the leakage current is too large, the human body will be injured or killed, and electronic products and electronic equipment will be damaged.

There is a formula for leakage current as I=2πfCU. Among them: f is the mains frequency, that is, 50Hz; C is the total capacitance of the Y capacitor, and U is the voltage to the ground terminal. From the formula, the leakage current is proportional to the capacitance of the Y capacitor. The larger the capacitance of the Y capacitor, the greater the leakage current. For electrical appliances powered by 220V/50Hz AC grid, many regions stipulate that the leakage current should not be greater than 1mA, and the leakage current is proportional to the capacitance of the Y capacitor , which is why the capacitance of the Y capacitor in the power circuit should not be too large.

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

 Why Should We Choose Good Ceramic Capacitors?

As the basic components of electronic equipment, capacitors are very important to electronic equipment, and the quality of capacitors also determines the quality of electronic equipment.

The dielectric of ceramic capacitors is a high dielectric constant ceramic material. The electrodes are silver-plated ceramic dielectric sintered at high temperature, and the shell is encapsulated with flame retardant epoxy resin.

Ceramic capacitors have a wide range of temperature coefficients, large specific capacitance, good moisture resistance, and low dielectric loss. They are widely used in electronic circuits. Why should we choose high quality ceramic capacitors when doing the purchase?

The dangers of using poor quality ceramic capacitors:

1. Poor moisture resistance, increased moisture, increased leakage current, resulting in damage to electronic equipment;

2. The dielectric loss is large, and the use time of the capacitor is shortened, resulting in damage to the ceramic capacitor and breakdown, and damage to the electronic equipment;

3. Damage and burn of electronic equipment during use, and quality problems in electronic equipment will affect brand reputation and image.

When purchasing ceramic capacitors, manufacturers with production qualifications, on-site production bases, and after-sales service should be selected. The product quality of such capacitor manufacturers is guaranteed.

JYH HSU (or Dongguan Zhixu Electronics) not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories has passed ISO9001:2015 quality management system certification. Welcome to contact us if you need samples.  https://www.jeccapacitor.com/

 What Would Happen Without A Varistor in the Circuit

Circuits in electronic products are composed of metal wires, electrical and electronic components, and are paths for current to flow. Circuits can transmit, distribute and convert electrical energy, and transmit and process signals. There is a blue disc type component in the circuit, that is the varistor.

Varistor is a voltage-limiting protection device, which is often used in circuits and switching power supplies to protect against lightning and high-voltage peaks. It can suppress the abnormal overvoltage and transient voltage that often appear in the circuit, and protect the circuit from the damage of the overvoltage.

The varistor has nonlinear volt-ampere characteristics. When the circuit voltage is too large, the varistor can withstand overvoltage and clamp the voltage, absorb excess current in the circuit, and prevent voltage instability, so as to protect the circuit and the following components, prevent excessive current from causing damage to other power devices. The material used as a varistor is semiconductor, so the varistor is also a semiconductor resistor.

What would happen if there were no varistors in the circuit?

1. If the voltage in the circuit is too large, the current will also increase. If the current is too large, the circuit temperature will be too high.

2. When the voltage in the circuit is too large, the electronic components will be damaged, the working time of the electronic components will be shortened, and the electronic components need to be replaced, which increases the maintenance cost.

3. The higher the voltage in the circuit, the stronger the breakdown capability, which not only causes damage to electronic components, but also easily endangers the human body.

Circuits without varistors have unstable performance, and circuits and electronic components are easily damaged and short-circuited to cause fire. The varistor is equivalent to the air bag on the car. It is usually inconspicuous, and it plays a protective role at a critical moment. Therefore, it is still necessary to use a varistor for overvoltage protection in the circuit.

To purchase electronic components, you need to find a reliable manufacturer first. JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) has passed ISO9001:2015 quality management system certification. Welcome to contact us for technical problems or business cooperation. Our official website: www.jeccapacitor.com

 About the Harm of ESD and How to Deal with It

 

With the development of miniaturization and multi-function of electronic products, electronic products have higher and higher requirements for circuits. ESD interferes with the work of electronic products, and the damage of it causing to electronic products has attracted people's attention. So it is necessary to prevent ESD so as to protect electronic circuits. What is ESD and what hazards it may cause? How to deal with it?

1. What is ESD?

In the field of electronics, ESD (Electro-Static discharge) means electrostatic discharge, which refers to the static electricity released when two objects are in contact.

2. How does ESD come about?

ESD occurs when two different materials are in contact or rubbed. The negative charge is attracted by the positive charge. The current discharge voltage generated by the attraction can be as high as tens of thousands of volts. The heat generated by electrostatic discharge is very high, and the human body will not feel it. When a charge is released onto an electronic device, the large heat from the charge can melt tiny parts of the electronic device, causing the device to malfunction.

3. The hazard of ESD

1. Electrostatic discharge will break down the device and damage the device, thereby reducing the reliability of the device.

2. Electrostatic discharge will radiate radio waves with frequency, causing electronic interference and affecting the normal operation of the device.

3. Sparks will occur when static electricity is discharged, which is easy to cause fire and explosion.

4. How to solve ESD?

As a surge protection device, the varistor can be used in ESD protection, because the varistor has the advantages of nonlinear characteristics, large flux, strong surge resistance, and fast response speed, providing a discharge channel for electrostatic discharge, eliminating sparks, inhibiting the intrusion of dangerous static electricity into electronic equipment. The varistor acts as a suppressor to protect the equipment and circuits from electrostatic discharge.

ESD is an important cause of malfunction or damage of electronic products. With the development of technology and the improvement of product complexity, everyone also pays attention to the harm of ESD to electronic products. As a surge protection device, varistor has its own advantages. It is used in ESD protection occasions and plays an important role in ESD protection.

Select a reliable manufacturer when purchasing varistor can avoid a lot of unnecessary trouble. JYH HSU(JEC) Electronics Ltd 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/

 

Appearance of The First Pure Supercapacitor Ferryboat

Big news! Recently, the first pure supercapacitor ferryboat - “New Ecology” has been created and successfully arrived at the Chongming district of Shanghai, China.

The ferryboat which is 65 meters long, 14.5 meters wide and 4.3 meters deep, can accommodate 30 cars and 165 passengers.Why does it catch media's attention?

It turns out that this ferry is the first ferry in the world to use supercapacitors as power to travel on the water. This is not only a major advance in supercapacitors, but also an advance in technology. It should be known that the power of the ship is mainly driven by the diesel in the diesel engine, and the engine is used as an auxiliary to propel the ship to travel on the water.

The supercapacitor has a fast charging and discharging speed, it only takes a few seconds to a few minutes to fully charge 95% of the power. However, the larger the volume of the supercapacitor, the larger the capacitance, and it will take longer to be fully charged. With the same volume, the supercapacitor has a larger capacitance than ordinary capacitors, reaching the Farad level. However, compared with batteries, the electric capacity of supercapacitors is still too small, so batteries have always been the mainstream in power vehicles.

The appearance of the first pure supercapacitor ferry, "New Ecology", made people see the potential of supercapacitors. The power density of supercapacitors is higher than that of batteries, the energy loss during discharge is small, the charging speed is fast, and it can be repeatedly charged for hundreds of thousands of times without causing pollution to the environment. It is an ideal green energy source with stable performance and will not explode during use.

The pure supercapacitor ferry "New Ecology" is used to travel to and from Changxing Island and Hengsha Island. The fast charging speed enables the "New Ecology" to charge enough electricity to sail back and forth between Changxing Island and Hengsha Island in a short period of time. Therefore, it is more appropriate for the "New Ecology" to use super capacitors as power.

The "New Ecology" is powered by a super capacitor and is charged by a charging device. The battery can be charged in 15 minutes for 1 hour. It only takes 10 minutes to reach the destination by ferry from Changxing Island to Hengsha Island, which is fast and environmentally friendly.

Supercapacitor buses have used supercapacitors as power to drive, and today there are pure supercapacitor ferries that use supercapacitors as a power source to drive on the sea. It is believed that in the near future, with more advanced technology, supercapacitors can replace batteries as a power source and be used in more fields, contributing to environmental protection and energy shortages.

To purchase electronic components, you need to find a reliable manufacturer first. JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) has a full range of varistor and capacitor models with guaranteed quality. JEC has passed ISO9001:2015 quality management system certification. Welcome to contact us for technical problems or business cooperation. You may google search "JYH HSU" to visit our official website: Safety Capacitor, Cheap Resistors, Resistor China

 Reasons for the Failure of Filter Film Capacitors

Film capacitors are excellent capacitors due to their many excellent properties. It has high insulation resistance, excellent frequency characteristics (broad frequency response), and low dielectric loss. Based on the above advantages, film capacitors are widely used in analog circuits. Film capacitors have the function of filtering, so what are filtering film capacitors?

The filter film capacitor is a kind of energy storage device installed at both ends of the rectifier circuit to reduce the AC pulsation ripple coefficient and improve the smooth DC output. The filter circuit requires a large capacity of the energy storage capacitor. In all circuits that need to convert alternating current into direct current, setting filter film capacitors will make the working performance of the electronic circuit more stable, and also reduce the interference of the alternating ripple on the electronic circuit. It is found that the filter film capacitor fails during use, which is likely to be due to these reasons:

1) The product quality of the filter film capacitor itself, such as unqualified manufacturing process and materials, the marked capacitance does not match the actual capacitance, and the aging caused by long use time will cause burnout.

2) The influence of the external environment, such as installation in a place with poor heat dissipation or close to a heat source, poor connection of capacitors, poor contact, etc., can also easily cause burnout.

3) Harmonic problem, harmonics make the filter film capacitor resonate, causing the capacitor to overcurrent and burn out.

There are other special reasons. It is necessary to analyze and judge the site where the filter film capacitor is burned out, and gradually investigate the cause of the failure. Sometimes small details may also be the cause of the burnout.

When choosing a film capacitor, you need to find a reliable manufacturer. JYH HSU (or Dongguan Zhixu Electronics) not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories has passed ISO9001:2015 quality management system certification; JEC safety capacitors (X capacitors and Y capacitors) and varistors have passed the certification of various countries; JEC ceramic capacitors, film capacitors and super capacitors are in line with low carbon indicators. Welcome to visit our official website: https://www.jeccapacitor.com

 About Temperature Control Thermistor

The typical characteristic of thermistors is that they are sensitive to temperature and exhibit different resistance values at different temperatures. The positive temperature coefficient thermistor (PTC) has a larger resistance value when the temperature is higher, and the negative temperature coefficient thermistor (NTC) has a lower resistance value when the temperature is higher. They are both semiconductor devices. So why is the thermistor also called a temperature-controlled thermistor?

A temperature-controlled thermistor is actually a thermistor, which is an electronic component that is sensitive to temperature. The main function of the thermistor is to control temperature. So what are the applications of temperature control thermistors? 

Unlike resistance thermometers that use pure metal, the materials used in thermistors are usually ceramics or polymers. Thermistors usually achieve high accuracy in a limited temperature range, usually -90℃~130℃. Thermistors can be used in temperature control circuits. In fact, refrigerators with electronic thermostats use thermistors. Many household appliances now contain thermistors. The existence of this component is to control its temperature, which can avoid damage to the electrical appliance due to unsuitable temperature, so as to achieve the function of protection.

In addition to being used in electrical appliances, temperature-controlled thermistors are also used in many electrical equipment. 

To choose a thermistor, you should find a reliable manufacturer to avoid unnecessary problems. JYH HSU(JEC) Electronics Ltd (or Dongguan Zhixu Electronic Co., Ltd.) is the original manufacturer of various kinds of electronic components. JEC has passed ISO9001:2015 quality management system certification. We have over 30 years of manufacturing experience. If you have technical questions or need samples, please contact us: https://www.jeccapacitor.com/

 How to Avoid Pitfalls When Purchasing Safety Capacitors

Science and technology are constantly improving over time. Computers, communications, industrial automation, electrical appliances and household appliances have been invented one after another. One of the important components of electronic products: capacitors are also developing.

The development prospect of the capacitor industry is good. Many unscrupulous merchants find business opportunities and start to sell seconds at best quality prices. They use inferior products to replace high-quality products to profit from it. Let’s see how to avoid pitfalls when purchasing safety capacitors.

Safety capacitors are divided into X capacitors and Y capacitors. It is a very common electronic component in the power supply. The X capacitor is responsible for removing the differential mode interference in the power supply. The Y capacitor is responsible for removing common mode interference and is generally used in power circuits to achieve bypass, decoupling, filtering and energy storage. Appropriate safety capacitors are very important, and will determine the length of use and the stability of performance of electronic products.

1. Safety Certification

If you want to know whether the safety capacitor is good or not, check whether there is a safety certification logo on the printing of the capacitor. If there is no safety certification logo, it is not a real safety capacitor. Strict regulations in the industry: Safety capacitors must pass safety certification before they can be sold.

2. Model Selection

There are many types of safety capacitors, and each type has a suitable application, which must be paid attention to. Unscrupulous merchants just want to make quick money, regardless of whether the model is suitable or not. You can consult relevant practitioners to choose the correct model.

3. Production Qualification

Some unscrupulous merchants are good when they show you safety capacitors, the quality of the model is no problem, and the samples given to you are also good, but they are doped with inferior capacitors when they are shipped, which leads to waste of time, effort and cost. Faced with such a situation, when purchasing safety capacitors, you should shop around and choose a capacitor manufacturer with a long business history, good reputation, production qualifications, and after-sales service.

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

Portable battery starters, also known as car starting power sources in China, are called Jump Starters overseas. In recent years, North America, Europe, and China have become important markets for this category.

Such products have become high-frequency consumer power products, whether on the online Amazon platform in the United States or offline Costco. The popularity of Jump Starters is closely related to the large number of cars in the global market and the high labor cost of auto rescue services.

The first generation of car starting power is built with lead-acid batteries, which are bulky and inconvenient to carry; in addition, the second generation of car starting power using power lithium batteries was born.

What we are going to introduce below is the third-generation car starter power supply using super capacitors. Compared with the previous two generations of products, it can be described as a master of many technologies, especially the safety and longevity that consumers are most concerned about.

 

Supercapacitors for Automotive Jump Starter

Supercapacitors are a branch of capacitors, also known as farad capacitors. They have the characteristics of fast charging and discharging of capacitors, and also have the advantages of low internal resistance, large capacitance and long life. They are usually used for energy storage or power failure protection.

The use of supercapacitors brings many technical and economical advantages for automotive emergency starting power.

Ultra-low internal resistance acceleration start: small internal resistance, which can meet the discharge of large current and improve the application range of power supply to various models.

The electrostatic energy storage mechanism has a wide range of applications: the electrostatic energy storage mechanism enables the supercapacitor to complete charge and discharge within tens of seconds, and work normally in a wide temperature range of -40 to +65 °C, ensuring that the emergency start equipment can operate in a wide range of temperatures and temperatures. Territorial use.

Ultra-long cycle life: Super capacitors have an ultra-long cycle life of more than 10 years (50W times) in extreme environments (-40℃~+65℃).

 

JYH HSU (JEC) launched a car emergency start solution based on supercapacitor products. Supercapacitors have good high and low temperature performance, and can be stored for a long time in a high temperature environment in the car without safety issues. Compared with the 45°C working temperature of lithium batteries, super capacitors have a wider working temperature, so don't worry about putting them in the car.

 

And the super capacitor can be stored at zero voltage, and it can be charged by the mobile power supply or the remaining battery power during use, so there is no need to worry about safety. Thanks to the fast charging and discharging characteristics of supercapacitors, they can be fully charged within tens of seconds to start the car.

 

Due to the production increase in automobiles, supercapacitors will have a great potential in the industry.

Purchase supercapacitors for competitive prices: https://www.jeccapacitor.com/cylindrical-type/double-layer-100f-400f-supercapacitor-stocks.html

 Why Should The Working Voltage Be Considered When Selecting a Varistor?

The circuits of current electronic products are delicate and complex, and many aspects need to be considered in the selection of electronic components used in circuit protection. The varistor is a voltage-limiting protection component.

When the voltage at both ends of the varistor in the circuit is too large, the varistor will clamp the voltage, control the circuit voltage within the acceptable range, and also absorb excess current to prevent the circuit from burning and protect other components.

In the circuit system, the varistor plays an overvoltage protection role, and the overvoltage protection of the varistor can increase the stability of the entire system. When working, the varistor may sometimes sparkles, especially for the varistor connected to the power line, which is a very bad phenomenon.

The change of the varistor when the working voltage is different:

(1) When the voltage applied to the varistor is lower than its nominal value, the resistance of the resistor is infinite, and almost no current flows through;

(2) When the voltage across the varistor is slightly greater than the nominal voltage, the varistor quickly breaks down and conducts, and the resistance decreases, making the resistor in a conducting state and the current flowing through the varistor;

(3) When the voltage applied to both ends of the varistor is far beyond the limit voltage range, the varistor cannot prevent the current from passing through, and the voltage is too large to break down the varistor and damage the varistor. The damage to the varistor is irreversible

Therefore, when selecting a varistor, the appropriate model should be selected according to the working voltage, and the voltage applied to the varistor should not be higher than the nominal voltage of the varistor. If you don't know how to choose a varistor model, you can consult a professional in the industry.

 

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