Disinfection cabinets have been applied in public places such as hotels, restaurants, industrial canteens, Chinese and Western restaurants, and canteens of enterprises and institutions, and have gradually entered modern homes. Disinfection cabinets have gradually become an essential disinfection tool in daily life. While people value its practicality, its safety, reliability, and stability are also issues of concern. The disinfection methods for cupboards are mostly thermal infrared or ultraviolet. By driving infrared or ultraviolet emission tubes with high frequency and high voltage, this high-frequency and high voltage driving circuit is prone to burning out the driving transistor due to high current and temperature. This puts forward high requirements for the design of engineers. To ensure the reliability and safety of the circuit, it is necessary to design overcurrent and overheating protection circuits. Especially when there is no installed infrared emission tube or ultraviol
Rolling gate is a widely used door in modern factories and shops, which can not only automatically lift and manually switch, but also be remotely operated. The core of this type of door is to control the forward and reverse rotation of the small motor to achieve its function. The rolling gate is driven by a small motor, which not only often gets stuck and cannot move, but also causes the small motor to stall, overload, and burn out due to unstable voltage, high temperature, high humidity, and other reasons. So small motors must be designed with protective circuits to ensure their reliability and stability. There are various methods for protecting small motors. Previously, bimetallic temperature controllers were often used for protection. When the coil temperature of the small motor increased, the circuit would be disconnected, and when the temperature decreased, the circuit would be reconnected. If the power supply was not cut off, the motor would continue to be powered on and wo
Power transformers are commonly used components in electronic products and are widely used due to their simplicity and ease of manufacture. There are two types of transformers: step-up transformers and step-down transformers (excluding impedance transformers and line matching transformers). They are also called linear transformers because they increase or decrease the original AC voltage proportionally and output it to the load for power supply. In application, step-up transformers are mainly used in instruments and meters; For the power supply of electronic products, the majority are actually step-down transformers. Structurally, the transformer is composed of stacked silicon steel sheets and primary coils. The coil is mostly wound with enameled copper wire, and now it is also used with enameled aluminum wire. For step-down transformers, their characteristics are: the primary input is 220V, the secondary output is low-voltage, the secondary current is small, the secondary curren
Fingerprint door lock is a widely used door lock product in modern homes, factories, and enterprises. Its main functions include fingerprint recognition, storage, and opening and closing door locks. It is composed of fingerprint recognition and storage circuits, DSP data processing circuits, door opening and closing actuators, power circuits, and other components. Some door locks also require output signals to control the camera, open voice communication connections, and complete remote control functions. In this system, the power circuit, data transmission port circuit, and electromagnetic actuator of the control lock are prone to burning out the power circuit and DSP control system circuit due to unstable power supply voltage, lightning discharge, short circuit of installation wiring, etc. In severe cases, safety hazards such as burning out wires and causing wires to catch fire may occur. These interface points all require the design of ESD, overvoltage, overcurrent, and reverse
With the development of technology and social progress, people are paying more and more attention to the intellectual development of infants and young children. Various educational toys are springing up one after another, including electric and non electric ones, with thousands of types and varying quality requirements. When people purchase toys, they often pay more attention to their playable functions and neglect their safety. Many toy quality issues are only taken seriously when accidents occur, but it is too late and have already caused harm to people, some of which may last for a lifetime. In foreign countries and particularly developed countries, the safety of electronic toys is the most important. Regardless of certification, testing, research and development design, customer requirements, etc., the first consideration is safety, followed by the functions of toys, especially electric toys. Therefore, the safety protection of toys is the primary issue. In clause 3.6.2 of th
Air purifiers, also known as air filters, can filter out impurities in the air and output clean air. In this era of industrial pollution and severe smog, air purifiers have become essential equipment widely used in homes, hotels, and other places. It consists of three parts: control circuit, mechanical and detection status indication. The mechanical part involves the fan motor passing indoor air through a filter and circulating impurities to achieve air purification. The core of an air purifier is a small motor. In this transmission system mechanism, small motors are prone to overload or rotation due to problems such as mechanical lack of lubricating oil, bearing wear, rust, dust, etc., ranging from burning out the motor to burning out the motor and wires, and even leading to fire accidents. So it is necessary to design overload protection and gambling protection circuits for the motor to ensure safe operation. Traditional designs often use bimetallic temperature controllers as o