In electronic products, chip fuses have two functions: to protect users from harm and to protect circuits from damage. These functions benefit both device users and manufacturers. Over the past decade, the demand for electronic devices serving information technology, mobile, and consumer applications has sharply increased in the market. With this rapidly growing demand, the risk of unexpected situations in electronic devices has also increased, requiring the use of overcurrent protection devices such as chip fuses to avoid risks such as electrical overload. Before analyzing the electrical characteristics of various chip fuses in the market, it is first necessary to understand the basic design principles behind each technology. Standard fuses may be based on metal wires placed inside sealed ceramic or glass tubes filled with air or sand, but chip fuses are based on completely different principles. Most chip fuses appear to be standard chip devices and are made of single or multi-l
A fuse box refers to a box (also known as a fuse holder) that allows for dry installation of fuses. Some also have functional features such as waterproofing, fire resistance, and high temperature resistance (depending on different raw materials and shapes). The general injection molding materials for fuse boxes include plastic, nylon, bakelite, and PBT engineering plastics. Different raw materials have varying degrees of high temperature resistance. When selecting a fuse box, consideration should be given to the current and size requirements of the fuse used. The higher the fuse current, the larger the wires should be used to match the fuse box, otherwise it may cause the fuse box and wires to heat up and cause a fire. Fuse boxes can be divided into lead fuse boxes and automotive fuse boxes. The classification of fuse boxes can be divided into fuse boxes and fuse boxes based on the classification of device fuses. According to fuse subdivision, it can be divided into large fuse b
1. Safety certification: Determine the safety certification of fuses based on the required safety certification for the entire machine, such as UL or IEC specifications. 2. Structural size: The size is determined based on the space in the circuit design, such as length, diameter, and whether there are leads. 3. Rated voltage: It must be greater than or equal to the actual application voltage, generally including 24V, 32V, 63V, 125V, 250V, etc. 4. Breaking capacity: should be greater than the maximum fault current in the circuit. 5. Rated current: Based on the following items: (1) Normal working current, the rated current of UL specification fuses operating at 25 ℃ is ≥ normal working current/0.75; The rated current of IEC standard fuses is ≥ normal working current/0.9. (2) Environmental temperature: The current carrying capacity test of a fuse is conducted under the ambient temperature of 25 ℃. The higher the ambient temperature, the shorter the lifespan of the fuse, and the lower
When a fuse is energized, its own resistance converts electrical energy into heat, causing the melt to heat up. At the same time, the heat generated by the current also radiates to the surrounding environment through the melt and shell, and dissipates heat through convection and conduction. When a fuse passes through the allowable working current, the heat emitted and generated reaches a balance, and the heat does not accumulate in the melt, causing the temperature of the melt to rise. Therefore, the fuse will not reach its melting point and blow. When the current passing through the fuse reaches a certain value, the heat converted from electrical energy increases, and the heat dissipation rate cannot keep up with the heating rate. This heat gradually accumulates on the melt, causing the temperature of the melt to rise. When the temperature reaches the melting point of the fuse, the fuse begins to melt and continues to absorb heat, further melting into a liquid state. Subsequently,
With the rapid development of modern technology, a large number of products can only be integrated into our daily lives, and the broom is one of them. As a smart home product, floor sweepers are not uncommon in first tier cities in China. The working principle of a floor sweeper is not too difficult to understand, mainly relying on the drive of internal small motors to provide power. Due to unstable voltage or jamming during operation, the motor may encounter problems such as rotor blockage, overload, or even burning out. So the internal motor must be designed with corresponding protection circuits to ensure its reliability and stability of operation. There are many types of protection methods for small motors inside the sweeping machine. Previously, bimetallic temperature controllers were commonly used. When the motor was working, if the coil temperature increased, the circuit would be disconnected, and after the temperature decreased, it would be connected again. However, this m
Nowadays, cars generally come with USB 3.0 ports. In addition to overcurrent and overvoltage protection, sensitive electronic devices using high-speed interfaces such as USB and HDMI also require electrostatic discharge (ESD) protection. Three different types of circuit protection devices can help avoid these potential destructive events. PolySwitch polymer positive temperature coefficient (PPTC) devices can provide self-healing protection in USB applications. Placing the PolySwitch PPTC device on the VBUS port of the USB power supply can limit the current during short circuit events, help prevent damage caused by sudden short circuits, and help achieve UL60950 compliance. The design of USB 3.0 uses circuit protection devices to help prevent overcurrent (PTTC, left) and overvoltage (PolyZen, right) damage at the power port, as well as ESD (SESD device) events at the data port For overvoltage protection in USB 3.0 applications, PolyZen devices use a hybrid approach that integrate
MB:+86 13924633629 Ms.vicky
E-mail: waimao@xcfuse.com
Factory :
XC Electronics(Shenzhen)Corp.,LTD
Add: Jinyuan Industrial zone,Heao, Henggang, Shenzhen 518115,China
Shenzhen branch: Shenzhen Xucheng Electronic Commerce co.Ltd
Add: 8-15 Jinyuan Industrial zone,Heao, Henggang, Shenzhen 518115,China
