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

 Combination of Varistors and Fuses in the Circuit

Each electronic product is composed of different electronic components. Without one of them, the electronic product cannot operate normally. The most common problem encountered by electronic products during work is overvoltage.

In the circuit, due to improper parameter coordination or external factors, part of the voltage in the circuit rises, exceeding the value under normal conditions, which is overvoltage. There are varistors and fuses in electronics to handle overvoltage situations like this.

The varistor is an electronic component with nonlinear volt-ampere characteristics. Its function is to clamp the voltage when the circuit voltage is too large to withstand, and will absorb the excess current in the circuit to protect the subsequent circuit and electronic components.

Like building a house, the foundation must be laid before the height of the house can be determined. The role of the varistor in the circuit is also very important. If the varistor is not used, the circuit will fail due to excessive voltage, causing the electronic components on the circuit to not work normally, which will affect the operation of electrical appliances, and will also damage the circuit and electrical appliances.

The fuse acts as overcurrent protection in the circuit, and can also be called short circuit protection. When the circuit fails or is abnormal, the fuse will automatically blow and cut off the current, which will protect the subsequent circuit and electronic components to a certain extent.

When the circuit fails, the current increases and the temperature rises, which will damage the electronic components on the circuit, and even cause a fire in severe cases. Therefore, when the current of the circuit increases, the fuse will automatically blow, and the current will be cut off, and will not flow to the subsequent circuit, which will protect the subsequent circuit and electronic components. When the overcurrent disappears, the fuse will automatically reconnect and the circuit will resume normal operation. So that's why fuses are used in the circuit.

In the circuit, the varistor is used together with the fuse to protect the circuit when it is affected by lightning or overvoltage, and it is used for transient voltage protection in the circuit. When the circuit is over-voltage, the varistor will be broken down and present a short-circuit state, thereby clamping the voltage at both ends at a lower level. The over-current caused by the short-circuit will automatically blow the fuse, forcibly cut off the power supply, and protect the subsequent circuit and electronic component.

This is why in the circuit, the varistor and the fuse are used together to protect the circuit.

Select a reliable manufacturer when purchasing electronic components can avoid a lot of unnecessary trouble. JYH HSU(JEC) (or Dongguan Zhixu Electronics) not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories are ISO 9000 and ISO 14000 certified. Welcome to contact us: https://www.jeccapacitor.com

 Thermistor in Electronic Thermometer

Before the mercury thermometer was invented, people used the back of their hands to measure their body temperature. This method of measuring body temperature was not accurate. Everyone's perception of body temperature is different, some people are sensitive to temperature, and some people are not sensitive to temperature. After the mercury thermometer comes out, it is more accurate to measure body temperature than human body temperature. Until now, people have invented electronic thermometers, which are more convenient to use than mercury thermometers, and have faster temperature measurement speed.

The electronic thermometer can accurately measure the temperature by the temperature sensor: thermistor. A thermistor is a semiconductor resistor made of semiconductor material that is sensitive to temperature and whose resistance value changes with temperature. According to different temperature coefficients, it is generally divided into PTC thermistor and NTC thermistor.

NTC thermistor is used in the electronic thermometer. NTC thermistor is a negative temperature coefficient thermistor whose resistance value decreases with the increase of temperature. NTC thermistors have these advantages: small size; low price, able to be manufactured in large quantities; fast response speed; high precision accuracy, so they are widely used in medical equipment. The electronic thermometer is designed using the characteristics of NTC thermistors that are sensitive to temperature and have a temperature accuracy of 0.1°C.

In addition to being used in medical equipment such as electronic thermometers, NTC thermistors are also used in temperature measurement in granary thermometers, food storage scientific farming, oceans, deep wells, glaciers, etc. NTC thermistors have many advantages and great market demand. When choosing thermistors, you need to pay attention to distinguishing them to avoid inferior thermistors.

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/

 Application of Supercapacitor in National Defense

Supercapacitor, as an important energy supply component in high-power pulse weapon equipment, is a new type of energy storage device that can burst out huge energy in a short period of time, and can be called the "energy core" of many military equipment. Its performance can be called "outstanding" in armored vehicles, ships, aerospace vehicles and other weapons and equipment that require large pulse discharge power.

Supercapacitors can be used in laser weapons, beam energy weapons, microwave weapons, electromagnetic guns and other advanced weapon systems. The huge energy generated by the supercapacitor can ensure the energy supply of laser weapons. It also plays an important functional role in particle beam energy weapons, microwave weapons, and supercapacitors. High-power pulsed laser weapons are weapon systems that will have an important impact on the future battlefield.

Electromagnetic guns mainly use electromagnetic launch technology, which is one of the most advanced combat weapon systems at present. The application of super capacitors is mainly for instantaneous charging and discharging, and the characteristics of large capacitance. It can improve the launch efficiency, enhance the launch energy, shorten the launch time, and improve the demand for maneuverability. It also plays an important role in the application of aircraft carrier electromagnetic ejection.

In terms of tank applications, supercapacitors can be used as ignition power, dynamic aiming, etc., because of the superior characteristics of supercapacitors at low temperature, they can be started between -40°C and +70°C, and the stable reliability of supercapacitors can ensure the smooth operation of tanks , to avoid failures on complex and changeable battlefields.

In high-power radar applications, supercapacitors are charged quickly and discharged with high current, satisfying the requirement of pulsed high power density output.

Precisely because of the excellent performance of supercapacitors in the military field, they are favored by military enterprises. Nowadays, supercapacitors have gradually matured in the development of civilian technology. It is believed that in the application and research and development of military products in the future, it will become an important development direction.

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/