The role of temperature fuse in vacuum cleaner Temperature fuses play an important role in circuit protection in vacuum cleaners. A vacuum cleaner is a household appliance typically equipped with an electric motor to generate suction. During use, the electric motor may overheat due to prolonged continuous operation or other abnormal conditions. At this point, the temperature fuse serves as an important safety device to prevent damage to the motor and ensure the safety performance of the vacuum cleaner. A temperature fuse is a specially designed thermal element that contains a thermal sensitive material inside, and its resistance characteristics change with temperature. When the temperature reaches or exceeds the rated triggering temperature of the fuse, the fuse will quickly open the circuit and cut off the current. The purpose of doing this is to prevent the temperature of the motor from further increasing, in order to avoid the occurrence of dangerous situations such as motor dam
What is the function of a patch self-healing fuse For some industry newcomers, they may not know the definition and function of patch fuses. Surface mount self-healing fuses are used to protect electronic devices from damage in the event of circuit abnormalities, greatly reducing damage. The common fuse is a fusible fuse inside a light bulb, so what is a patch self-healing fuse? According to its literal meaning, it can automatically return to a normal state. What is the function of a patch self-healing fuse? SMD self recovery fuse is an overcurrent electronic protection component made of polymer organic polymers under high voltage, high temperature, and sulfurization reaction conditions. It is processed by special processes after adding conductive particle materials. SMD self-healing fuse is a positive temperature coefficient polymer thermistor that can replace current fuses. The temperature of the patch self-healing fuse during normal operation is relatively low, achieving balance
Knowledge of automotive fuses Fuse is the common name for a fuse, which plays a role in short-circuit protection, protecting circuits and electrical equipment from damage caused by short-circuit faults, and avoiding fires. In the past, metal fuses were essential components in our home circuits, but with the advent of circuit breakers, fuses became less common. However, this does not mean that fuses are useless. With the emergence of new materials, many new fuses have been widely used in various circuits, playing a role in short-circuit protection. Usually, a fuse consists of three parts: 1. Melt, which is the core of a fuse, plays a role in cutting off the current when blown. Household fuses are commonly made of lead antimony alloy; 2. Electrode, it is the component that connects the melt and the circuit. There are usually two, which must have good conductivity, be tightly connected, and should not have excessive contact resistance; 3. The shell (bracket) and fuse melt are gener
Several common car fuses 1. Plug-in fuse According to the different rated currents, there are several types of fuses, including ultra small plug-in fuses, small car fuses, medium car fuses, and large car fuses. The rated current ranges from 1-40 amperes (A) to large 30-120 amperes (A), and the rated voltage is 32 volts (V). When using a vehicle, friends may occasionally find that some electrical appliances are not working, such as the headlights not turning on or the wipers not moving. In this case, you should first check the fuse to see if it is damaged. So, where are these fuses? What does it look like? The fuses of various circuits in a car are usually centrally arranged in a safe box. The position of the safe box may vary for different models of vehicles, and it appears as a small black plastic box. In your car manual, you can find where the car fuse panel is located, and most car designers will place the car fuse panel on the side of the dashboard or in the engine compartmen
Working principle of fuse 1、 Working principle of fuse When the fuse is powered on, the heat converted from electrical energy increases the temperature of the fusible item. When passing through normal operating current or allowable overload current, the heat generated is radiated to the surrounding environment through the melt and shell, and the heat generated by convection, conduction, etc. gradually balances with the generated heat. If the generated heat is greater than the dissipated heat, the excess heat will gradually accumulate on the meltable object, causing its temperature to rise; When the temperature reaches and exceeds the melting point of the meltable material, it will melt, melt, and cut off the current, playing a role in protecting the circuit. 2、 Terminology of fuses Rated current: The nominal operating current of the fuse tube (the maximum current that the fuse can maintain normal operation for a long time under normal conditions). Rated voltage: The nominal oper
Application of PPTC Thermistor in Batteries Compared with NiMH or NICd batteries, lithium-ion batteries have a higher current density and are widely used in various portable devices. Lithium ion batteries are usually very sensitive to overcharging. When the voltage at both ends of the battery is too high during charging, it will increase battery leakage The danger of smoking, burning, and bursting (which is often quite severe). Overcharging may be caused by uncontrolled charging, electrode errors, or Caused by using an incorrect charger. When the charging and discharging current of lithium-ion batteries is too high or there is an external short circuit, internal heating may damage the battery or burn other components, seriously shortening the battery's cycle life. The task of protecting the circuit is to monitor the parameters of the battery's charging and discharging status in response to various possible faults, in order to ensure battery life and efficiency, and to prevent da
The difference between polymer PPTC and ceramic CPTC Positive temperature coefficient thermistor PTC (also known as self recovering fuse) is an overcurrent and over temperature protection component, which can be divided into two categories according to manufacturing materials: organic polymer PPTC and ceramic PTC (CPTC). Polymer PPTC is formed by extruding high molecular weight polymer into carbon powder. Carbon powder forms carbon chains for conductivity, and when heated, the polymer expands, causing the carbon chains to break and form high resistance. Ceramic CPTC is made by high-temperature sintering of barium titanate powder with positive temperature coefficient characteristics through electronic ceramic technology. Their commonality lies in their recoverability, which can be reused more than 6000 times. The main advantages of polymer PPTC are: zero power resistors at room temperature can be made very small, high current products only have a few milliohms, low power consumptio
Is polymer PTC thermistor used for over temperature control? Currently, polymer PTC thermistors are mainly used for overcurrent protection, and many polymer PTC thermistors have been successfully used for over temperature protection. This product allows battery pack designers to save some of the over temperature protection devices in their designs. Regarding the protection principle of polymer PTC thermistors, first we need to understand the materials used in their production and their composition. Polymer PTC thermistor is made of polymer material filled with carbon black particles. The characteristic of carbon black particles is that they have a conductive function, so they can pass the rated current. If the current flowing through a thermistor is too high during operation, its heating power will be greater than its heat dissipation power. At this time, the temperature of the thermistor will continue to rise, and at the same time, the collective in the thermistor will begin to
Application examples of self recovering fuses 1. Ballast Fluorescent lamps require ballasts to generate high voltage and high current for ignition. The ballast controls the electrical characteristics of fluorescent lamps. When the lamp is turned on, the electronic ballast generates high voltage impact at both ends of the lamp, igniting the lamp. A self oscillating circuit is formed in the electronic ballast, controlled by transistors. Many electronic ballasts fail due to lighting. When the lamp short circuits, reaches its service life, or is removed, overcurrent situations may occur, which will cause the cathode of the lamp to open. Due to power factor, the load resistance decreases. During startup, the ballast operates more than three times under abnormal operating current and high oscillation frequency; The switch circuit generates overcurrent and causes ballast failure. 2. Cordless phone battery The current and voltage of cordless phones are relatively small. SRP120, LTP070
Choose the self recovery fuse model Maintain current: The maximum amount of current that a resettable fuse can withstand before tripping and transitioning from a low resistance state to a high resistance state. The holding current of the fuse is higher than the maximum power in the circuit, so it will not trip during normal operation. Trip current: The amount of current that causes a fuse to trip and disconnect the circuit. Resettable fuses have a higher tripping current than traditional fuses and are designed to quickly trip under overcurrent conditions. The tripping current usually exceeds the holding current. Rated voltage: The maximum voltage at which a fuse can operate safely without breakdown. The rated voltage of the selected fuse must match or exceed the circuit voltage used. Maximum current: The maximum amount of electricity that can be passed through the above fuse, which can cause the fuse to overheat and potentially cause damage. The maximum rated current is usually s
How does a self-healing fuse work? The resettable fuse is composed of specially treated polymer and carbon black distributed inside. Under normal operation, polymers tightly bind conductive particles outside the crystal structure, forming a chain like conductive pathway. At this point, the resettable fuse is in a low resistance state, and the heat generated by the current flowing through the resettable fuse is minimal and will not change the crystal structure. When the circuit is short circuited or overloaded, the large current flowing through the resettable fuse will cause the polymer to melt, and the volume will rapidly increase, forming a high resistance state. The working current will rapidly decrease, thereby limiting and protecting the circuit. After the fault is eliminated, the reset fuse can cool down and crystallize again. The volume is reduced, and the conductive particles form a conductive path again. The reset fuse can be restored to a low resistance state, thus compl
Technical standard for PPTC self recovery fuse 1. Rated zero power resistor PPTC thermistors should be packaged as zero power resistors, and the resistance range should be indicated on the outer packaging. After withstand voltage and withstand current tests, the range of resistance change rate of each group of samples before themselves is δ | Ri before Ri/Ri before - (Rj before Rj)/Rj before | ≤ 100% 2. PTC effect Saying that a material has a PTC (positive temperature coefficient) effect means that the material's resistance increases with increasing temperature. For example, most metal materials have PTC effect. In these materials, the PTC effect is manifested as a linear increase in resistance with increasing temperature, which is commonly referred to as the linear PTC effect. 3. Nonlinear PTC effect Materials undergoing phase transition will exhibit a phenomenon of rapid increase in resistance within a narrow temperature range of several to ten orders of magnitude, known as t
The relationship and characteristics between PPTC and thermistor PPTC， Everyone knows, but many people are confused about thermistors. In fact, according to different Chinese language names, self recovering fuses, polymer switches, overcurrent protection sheets, etc. are also called PTC thermistors. PPTC is a high polymer positive temperature thermistor, belonging to a type of linear component. It is a resistor made of a special material semiconductor. Due to its sensitivity to temperature, its resistance changes with temperature. There are currently two common PTC types: PPTC polymer self-healing fuse and CPTC ceramic fuse. Although both belong to PTC and have the function of maintaining current, there are differences in initial resistance, response speed, and size. PPTC self-healing fuses are smaller in size, lower in resistance, and faster in response than ceramic fuses. Therefore, in terms of selection, PPTC self-healing fuses have a wider range of applications than ceramic fu
PPTC can be used for fast charging protection of lithium batteries Lithium batteries are currently high-energy density and lightweight batteries, but due to their highly active chemical properties, they require additional charge and discharge protection circuits for safety protection. The key component of the charge discharge protection circuit, Mosfet, also has a certain rate of short-circuit failure. If the production of lithium batteries is not large, this effect will not be reflected. However, the demand for lithium batteries is very high, and in the face of such a huge shipment volume, even with a probability risk of 1ppm, there is an average of 5600 dangerous events that may occur per year. So, in addition to the main protection circuit, add a secondary protection to further reduce the risk. In secondary protection components, generally only one component is used, including disposable fuses, PPTC self recovery fuses, and temperature fuses. Previously, using PPTC did not requi
The Application of PPTC in Automotive Electronics PPTC device technology has been widely used in the design of overcurrent and overheat circuit protection for portable appliances, mobile phones, computers, and remote communication devices. The new standards for passive components introduced by the Automotive Electronics Technology Committee have promoted the application of polymer temperature coefficient devices (PPTC) circuit protection technology in the automotive industry. The new car design mainly focuses on electronic circuits and mobile accessories, such as power windows, power seats, sunroof control, and remote information processing devices, aiming to reduce costs and improve reliability and functionality. The motor drive and control device must withstand certain harsh working environments and be able to operate continuously and reliably. On site failures are unavoidable, and choosing the correct circuit protection strategy will help ensure product reliability and minimize
Application of Self Recovering Fuses in RS485 Communication Interface Our common communication interfaces include RS232, RS485, etc., both of which are popular communication interfaces in the market, especially RS485. When the communication speed is 100kbps, its communication distance can reach over 1200 meters, and it also has a good signal-to-noise ratio. At the same time, its price is also relatively advantageous. However, due to its long-term exposure to outdoor environments and complex working voltage of only 5V, it is prone to damage when facing ESD and lightning strikes. Therefore, how to solve ESD and lightning surge has become a top priority. When facing such products, PPTC self recovering fuses play a crucial role: A self-healing fuse is composed of a polymer matrix and carbon black particles that make it conductive. It is a positive temperature coefficient polymer thermistor that can be used in RS-485 communication interface applications with a resistance value of 1.35
Application of PPTC self recovery fuse in USB 3.0 With the continuous improvement of high-tech, peripheral devices are also constantly being updated. In terms of USB applications, USB3.0 not only improves speed, but also enhances power supply. Introduce the commonly used overcurrent protection component polymer positive temperature coefficient thermistor (PPTC) in the industry, and compare its differences with low-voltage semiconductor switches in the application of USB 3.0. In addition, we will propose suggestions for the application of USB 3.0 overcurrent protection PPTC components based on the differences between USB 3.0 and USB 2.0, and use the new generation of thin low resistance surface adhesive PPTC components as an example to illustrate the development process of new conductor materials. By using new materials, good overcurrent protection can be provided for current ultra-thin electronic products. Due to the increasing demand for speed and power in electronic products, si
PPTC for overcurrent protection PPTC is a non-linear, temperature dependent resistor. In general, PPTC components have extremely high conductivity, so the circuit can operate normally. But when an overcurrent condition occurs, this high current will generate enough energy (Joule heating effect) on the PPTC component to exceed its transfer temperature, causing a resistance bounce of 104 to 106 times. Therefore, overcurrent conditions can be eliminated to achieve the goal of protecting circuits and components. In the USB 3.0 specification, it is explicitly required to use current limiting components as protection for the power supply end, and PPTC components and low-voltage semiconductor switches are often used as solutions for this current limiting. Most of the time, based on various considerations, engineers prefer to use PPTC components to prevent circuit damage. Because the available current has increased in USB 3.0, current limiting components need to pass more current while mai
The IO output port of the microcontroller controller requires PPTC self recovery fuse protection Firstly, understand what PPTC self recovery fuse is. PPTC fuse is a protective electronic component that changes its resistance value according to temperature changes. Under normal working conditions, PPTC fuses have very low resistance and excellent conductivity. However, when the current exceeds the set value, the PPTC fuse will heat up and the resistance value will rapidly increase, thereby limiting the current flow and protecting the circuit from overload. Once the current drops to a safe range, the PPTC fuse will automatically resume normal operation. This self-healing feature makes PPTC fuses very suitable for protecting the IO output ports of microcontroller controllers. Single chip microcontroller is a commonly used microprocessor in modern electronic devices, used to control and manage the operation of various external devices. The IO output port is a channel that connects the
The resistance values corresponding to different load currents in PPTC PPTC is a new type of recovery type overcurrent protection device, which is a thermally sensitive device. After PPTC is powered on, it is in a low resistance state and current can pass smoothly. But when overcurrent occurs in the circuit, PPTC will quickly heat up, generating a large amount of heat, causing its resistance value to rise rapidly. This can prevent excessive current from passing through and protect circuit safety. The resistance value of PPTC not only reflects its protection capability, but is also closely related to the working state of the circuit. Generally speaking, the larger the rated current of PPTC, the greater the amplitude of its resistance change. The following are the resistance values corresponding to different load currents. When the current load of PPTC is 10mA, its resistance value is around 0.8 ohms. At this point, PPTC is in a low resistance state, and current can flow smoothly. H
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