The role and characteristics of SPD varistor

SPD varistorThe manufacturer believes that the varistor has two specific applications in electronics, one for lightning protection of low-voltage equipment, and the other for automobiles< Br/>

First, the varistor can detect and suppress the repeated surge voltage without damage. The manufacturer of SPD varistor believes that the low-voltage electrical equipment in most areas of southern China was damaged by lightning in summer, which not only caused major property losses, but also caused personal injury. Due to its special electrical characteristics, varistors can be used to manufacture various semiconductor devices to protect electronic equipment and lightning surge protection under overvoltage conditions, and ensure the normal operation of various low-voltage devices under lightning stroke

The manufacturer of SPD varistor believes that lightning strikes cause damage to low-voltage electrical equipment, mainly because the lightning protection of distribution equipment does not conform to the technical specifications, and the overvoltage generated by lightning strikes is easy to cause electrical damage, because even the residual voltage of 10kV lightning arrester will reach 50kV under 5kA impact current, which means that the lightning arrester is difficult to play its role. Moreover, due to electromagnetic induction, there will be large overvoltage at the low voltage side, and the residual voltage will reach 1kv-3kV, resulting in damage to low-voltage electrical equipment

SPD varistorThe manufacturer believes that the application of varistor can significantly protect low-voltage electrical equipment. Generally speaking, in order to prevent lightning strikes, we need to take various lightning protection measures according to the specifications, and then install a varistor at the user's power supply end to achieve resistance adjustment at the power supply end. If there is a large voltage at the power supply end, the varistor will be broken down to ensure that the voltage at both ends is kept at the normal value, thus protecting the electrical equipment. In addition, the phase line or zero line is used to introduce lightning overvoltage, which can be broken down by two varistors, and the voltage at both ends will remain at normal value. At the same time, the fuse will be blown to ensure that no continuous current will pass through the varistor, thus protecting the varistor

Secondly, the application of varistor in automobile is mainly the introduction of modern electronic technology. The manufacturer of SPD varistor believes that the semiconductor device is also one of the new components introduced into the automobile, which is mainly used to protect the electrical system of the automobile and avoid the damage of overvoltage and surge energy to the system. The application of varistor in automobile can avoid using various technologies to adjust the electrical system. Low-voltage high-energy zinc oxide rheostat (MYN1) is directly used to regulate the voltage and current at the ab end of the power supply to protect the entire electrical system. Even if the battery is disconnected from the power supply or the load drops sharply, and there is large surge energy at both ends of the ab, the rheostat can also protect semiconductor devices and various electronic devices from surge impact, thus reducing the volume and weight of the vehicle and driving fuel consumption

Therefore, the application of varistors in automobiles can not only protect automobiles, but also improve automobile manufacturing technology and performance< Span style="font size: 18px;">SPD varistorThe manufacturer believes that the varistor can also protect the voltage and suppress the overvoltage of electronic ignition. When the ignition system is in normal working condition, the ignition ring will generate back EMF. If the voltage at both ends of secondary L2 calculated by turn ratio exceeds 20kV, the high voltage will cause the spark plug to break down instantaneously and the ignition will start normally. However, if the ignition system fails and the ignition is abnormal, the induced voltage will lead to higher overvoltage at the primary end of the ignition system, thus shortening the service life. By applying the varistor and directly connecting the varistor at both ends of the composite tube, the ignition system can be protected, the overvoltage can be suppressed, and the automobile electrical system can be protected