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captron electrical components are fuses that can be operated multiple times, known in Japan as permanent fuses. Immediately after interrupting an overload or short-circuit current, the fusible element automatically restores to its original state. The housing is made of austenitic stainless steel, with a beryllium oxide ceramic core embedded in the center. The space between the stainless steel and the ceramic core is filled with glass to seal and secure the ceramic core. The fine pores in the ceramic core are filled with metallic sodium as the fusible element, and the void behind the piston is filled with argon gas to compress the metallic sodium. Under normal operating conditions, current can enter from lead terminal A, pass through the metallic sodium in the fine pores of the ceramic core, conduct to the stainless steel housing, and exit via output terminal B. When a short-circuit current passes through the fuse, it rapidly heats the metallic sodium in the fine pores of the ceramic core, causing it to change from a solid to a high-temperature, high-pressure plasma vapor. The resistivity increases rapidly, thereby strongly limiting the short-circuit current and interrupting it instantaneously. When the interruption is complete, the metallic sodium vapor immediately returns to liquid and solid states, while the argon gas again pushes the piston to compress the metallic sodium, re-establishing the circuit connection.

captron electrical component principle

Inductance is the ratio of the magnetic flux in and around a conductor carrying alternating current to the current producing this flux. When direct current flows through an inductor, only static magnetic field lines are present around it, which do not change with time; however, when alternating current flows through a coil, the surrounding magnetic field lines change with time. Analyzed according to Faraday's law of electromagnetic induction (magnetism generating electricity), changing magnetic field lines produce an induced electromotive force (EMF) at both ends of the coil, which acts as a "new power source." When a closed loop is formed, this induced EMF generates an induced current. According to Lenz's law, the total magnetic flux generated by the induced current attempts to oppose the change in the original magnetic flux. Since the change in the original magnetic flux originates from changes in the external alternating power source, the inductive coil objectively exhibits the characteristic of opposing changes in current in an AC circuit. Inductive coils have characteristics similar to inertia in mechanics, termed "self-induction" in electrical engineering. Sparks often occur at the instant of opening or closing a knife switch, caused by the high induced EMF generated by self-induction.

captron electrical component composition

The printed circuit board mainly consists of pads, vias, mounting holes, traces, components, connectors, copper pours, and electrical boundaries. ① Pad: A metal hole used for soldering component pins. ② Via: Includes metallic vias and non-metallic vias; metallic vias are used to connect component pins between layers. ③ Mounting hole: Used to secure the printed circuit board. ④ Trace: Copper film forming an electrical network used to connect component pins. ⑤ Connector: A component used for connections between printed circuit boards. ⑥ Copper pour: Copper filling applied to ground networks to effectively reduce impedance. ⑦ Electrical boundary: Defines the dimensions of the printed circuit board; no components on the board may extend beyond this boundary.

captron electrical component principle

Microphones have evolved from initial resistive electro-acoustic conversion to inductive and capacitive conversion. Many new microphone technologies have gradually developed, including aluminum ribbon and moving-coil microphones, as well as the widely used condenser and electret microphones. The working principle of a moving-coil microphone involves sound waves causing a diaphragm to vibrate through the air. The electromagnetic coil wound on the diaphragm cuts through the magnetic field formed by the magnet surrounding the moving-coil head, generating a weak fluctuating current. This current is transmitted to an amplifier, which converts the fluctuating current back into sound through the reverse process. For ribbon microphones, the aluminum ribbon serves as both the microphone diaphragm and the conductor moving in the magnetic field. The ribbon is typically made of aluminum foil. To achieve an ideal resonant frequency, the ribbon is corrugated to maintain precise tension. As a conductor and diaphragm, the ribbon is suspended in the magnetic field between two magnetic poles, vibrating with the frequency of incident sound waves and generating a voltage output at both ends. Condenser microphones consist of two metal plates, one coated with an electret film and grounded, and the other connected to the gate of a field-effect transistor (FET). A diode is connected between the gate and source. The diaphragm of condenser microphones often uses fluorinated ethylene propylene (FEP), which offers good humidity performance, generates more surface charge, and is less affected by humidity. Since this transducer also has a capacitive structure with high internal signal impedance, a field-effect transistor must be used at the output to extract and amplify the voltage signal generated by sound.

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