ABB electrical components Germany ABB model ABB price

ABB electrical components refer to an electrical device that disconnects the circuit by melting the fusible element with the heat generated by itself when the current exceeds the specified value. A fuse is a current protection device made based on the principle that when the current exceeds the specified value for a period of time, the heat generated by itself melts the fusible element, thereby disconnecting the circuit. Fuses are widely used in high and low voltage distribution systems, control systems, and electrical equipment as short-circuit and overcurrent protectors, and are one of the most commonly used protective devices. It is an electrical device that uses a metal conductor as the fusible element connected in series in the circuit. When overload or short-circuit current passes through the fusible element, it melts due to its own heating, thereby breaking the circuit. The fuse has a simple structure and is easy to use, and is widely used in power systems, various electrical equipment, and household appliances as a protective device.

ABB electrical component principle

The absorption film irradiated by infrared rays is a thin film with small heat capacity and easy temperature rise. There is a cavity structure directly below the center of the substrate, and the design of this structure ensures the temperature difference between the cold end and the temperature measuring end. The thermocouple is composed of polysilicon and aluminum, connected in series. When the temperature of the temperature measuring end of each thermocouple rises, a thermoelectromotive force Vn is generated between the thermocouples, so the sum of their voltages can be obtained at the output terminal.

ABB electrical component structure

The main purpose of fiber optic connectors is to realize the connection of optical fibers. Fiber optic connectors, which have been widely used in fiber optic communication systems, come in many types and structures. However, upon closer examination, the basic structure of various types of fiber optic connectors is consistent, that is, the vast majority of fiber optic connectors generally use high-precision components (consisting of two ferrules and one coupling tube, totaling three parts) to achieve aligned connection of optical fibers. This method involves inserting and fixing the optical fiber into the ferrule, polishing the surface of the ferrule, and achieving alignment in the coupling tube. The outer component of the ferrule is made of metal or non-metal materials. The mating end of the ferrule must be ground, and the other end usually uses a bend-limiting component to support the optical fiber or fiber optic cable to release stress. The coupling tube is generally made of two halves synthesized from ceramic or bronze materials, forming a tight cylindrical component, often equipped with metal or plastic flanges to facilitate the installation and fixation of the connector. To align the optical fibers as precisely as possible, the machining precision requirements for the ferrule and coupling tube are very high.

ABB electrical component features

Most microphones are electret condenser microphones (ECM), and this technology has a history of several decades. The working principle of ECM utilizes a polymer diaphragm with permanently isolated charge. Compared with the polymer diaphragm of ECM, MEMS microphones exhibit stable performance under different temperatures and are not affected by temperature, vibration, humidity, and time. Due to strong heat resistance, MEMS microphones can withstand high-temperature reflow soldering without any change in performance. Since the sensitivity change before and after assembly is very small, this can even save audio debugging costs during the manufacturing process. Currently, integrated circuit processes are increasingly being applied in the manufacturing of sensors and sensor interface integrated circuits. This micro-manufacturing process has the advantages of precision, flexible design, miniaturization, integration with signal processing circuits, low cost, and mass production. The first-order resonant frequency in such a low frequency band range will lead to extremely uneven frequency response of the microphone within the auditory frequency range, which is unacceptable for microphone applications. When tensile stress exists in the sensitive membrane, its resonant frequency will increase, but at the cost of sacrificing sensitivity. Of course, higher first-order resonant frequencies can be obtained by adjusting the size of the sensitive membrane, but this will still reduce sensitivity. It can be seen that the piezoresistive scheme is not suitable for the manufacture of miniature microphones. A feasible solution is to adopt a capacitive scheme to manufacture miniature microphones. The advantage of this method is that all materials used in the integrated circuit manufacturing process can be used for sensor manufacturing. However, it is quite difficult to manufacture micro-microphones using a single-chip process, because the air medium between the two capacitor plates can only have a very small gap. Moreover, due to size limitations, it is difficult to meet the bias voltage requirements in some application scenarios. Based on the above problems, research on capacitive microphones has never ceased. Compared with traditional electret microphones, micro-electro-mechanical system (MEMS) microphones have advantages such as small size, good heat resistance, good consistency, good stability, high reliability, and anti-radio frequency interference, and can also output digital signals, which is conducive to intelligent development.

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