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ziehl electrical components are detection devices that can sense measured information and convert the sensed information into electrical signals or other required forms of output according to specific rules, to meet requirements for information transmission, processing, storage, display, recording, and control. The existence and development of sensors give objects senses such as touch, taste, and smell, bringing objects to life; sensors are an extension of human senses. Sensors feature miniaturization, digitization, intelligence, multifunctionality, systematization, and networking. They are the primary link in achieving automatic detection and automatic control. A device or apparatus that can sense specified measured quantities and convert them into usable signals according to certain rules (mathematical function laws), typically composed of sensitive elements and conversion elements.

ziehl electrical component classification

Microphones can be classified into dynamic microphones and condenser microphones based on their transduction principles. Dynamic types can be further subdivided into moving-coil microphones and ribbon microphones. Common commercial microphone types include condenser microphones, crystal microphones, carbon microphones, and dynamic microphones. Common condenser microphones use two types of energy sources: DC bias power supplies and electret films. Both these condenser microphones and crystal microphones convert sound energy into electrical energy, generating a changing electric field. Carbon microphones use a DC voltage source, changing their resistance through sound vibration, thereby converting acoustic signals into electrical signals. Condenser, crystal, and carbon microphones all generate a voltage signal proportional to the displacement of the sensitive membrane, while dynamic microphones generate a voltage signal proportional to the vibration velocity of the sensitive membrane. Dynamic microphones use permanent magnets as an energy source, converting sound energy into electrical energy based on inductive effects.

ziehl electrical component structure

Solid-state relays consist of three parts: input circuit, isolation, and output circuit. Based on different categories of input voltage, input circuits can be divided into DC input circuits, AC input circuits, and AC/DC input circuits. Some input control circuits also feature compatibility with TTL/CMOS, positive/negative logic control, and inversion functions, allowing convenient connection to TTL and MOS logic circuits. For control signals with fixed control voltage, resistive input circuits are used. The isolation and coupling methods between the input and output circuits of solid-state relays include optocoupling and transformer coupling: optocoupling typically uses photodiode-phototransistor, photodiode-triac optocouplers, or photovoltaic cells to achieve isolated control between the control side and the load side; high-frequency transformer coupling utilizes self-excited high-frequency signals generated by the input control signal, coupled to the secondary side, then demodulated, rectified, and processed by logic circuits to form drive signals. The power switches of solid-state relays are directly connected to the power supply and load terminals to achieve switching of the load power. Mainly used components include high-power bipolar transistors, SCRs, triacs, power MOSFETs, and IGBTs. The output circuits of solid-state relays can also be divided into DC output circuits, AC output circuits, and AC/DC output circuits. Based on load type, they can be classified into DC solid-state relays and AC solid-state relays. For DC output, bipolar devices or power MOSFETs can be used; for AC output, two SCRs or one triac are typically used. AC solid-state relays can be further divided into single-phase AC solid-state relays and three-phase AC solid-state relays. AC solid-state relays can be classified into random-turn-on AC solid-state relays and zero-crossing AC solid-state relays based on the timing of turn-on and turn-off.

ziehl electrical component structure

A bipolar junction transistor is made by fabricating two closely spaced PN junctions on a semiconductor substrate. These two PN junctions divide the entire semiconductor into three parts: the base region in the middle, and the emitter and collector regions on the sides. The arrangement types are PNP and NPN. Corresponding electrodes are drawn from the three regions: base b, emitter e, and collector c. The PN junction between the emitter and base regions is called the emitter junction, and the PN junction between the collector and base regions is called the collector junction. The base region is very thin, while the emitter region is thicker with high impurity concentration. In PNP type transistors, the emitter "emits" holes, whose movement direction is consistent with the current direction, so the emitter arrow points inward; in NPN type transistors, the emitter "emits" free electrons, whose movement direction is opposite to the current direction, so the emitter arrow points outward. The direction of the emitter arrow also indicates the conduction direction of the PN junction under forward voltage. Both silicon and germanium bipolar transistors come in PNP and NPN types. Transistor package types and pin identification: Common transistor packages include metal and plastic types. Pin arrangements follow certain patterns. When viewed from the bottom with the three pins forming the vertices of an isosceles triangle, the order from left to right is e b c. For small-to-medium power plastic transistors, when oriented with the flat side facing you and the three pins pointing downward, the order from left to right is e b c.

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