Westcode electrical components Germany Westcode model Westcode price

Westcode electrical components are a new type of contactless switching device composed entirely of solid-state electronic components. It utilizes the switching characteristics of electronic components (such as switching transistors, triacs, and other semiconductor devices) to achieve contactless, spark-free circuit connection and disconnection, hence it is also known as a "contactless switch." A solid-state relay is a four-terminal active device, where two terminals are input control terminals and the other two are output controlled terminals. It has both amplification drive function and isolation function, making it very suitable for driving high-power switching actuators. Compared to electromagnetic relays, it offers higher reliability, is contactless, has a long service life, fast speed, and low external interference, and has been widely used [1].

Westcode electrical component types

(1) vacuum tubes can be classified by application into voltage amplifier tubes, power amplifier tubes, gas-filled tubes, thyratrons, ignitrons, frequency converter tubes, rectifier tubes, detector tubes, tuning indicator tubes (magic eye), and voltage regulator tubes. (2) Vacuum tubes can be classified by the number of electrodes into voltage amplifier tubes, triodes, tetrodes, pentodes, hexodes, heptodes, octodes, nonodes, and composite tubes. Tubes with more than three electrodes are also called multi-electrode or multi-grid tubes. (3) Vacuum tubes can be classified by shape and envelope material into bottle-shaped glass tubes (ST tubes), "acorn" tubes, cylindrical glass tubes (GT tubes), large glass tubes (G style tubes), metal-ceramic tubes, miniature tubes (also called peanut tubes or finger tubes, MT tubes), lighthouse tubes, and sub-miniature tubes (pencil-shaped tubes). (4) Vacuum tubes can be classified by internal structure into single diodes, diodes, double-diode triodes, dual diodes, single triodes, power pentodes, beam tetrodes, beam pentodes, duo-diodes, diode-pentode composite tubes, beam tetrodes, triode-pentode composite tubes, triode-hexode composite tubes, triode-heptode composite tubes, and various beam power types. (5) Vacuum tubes can be classified by cathode heating method into directly heated cathode vacuum tubes (current passes directly through the cathode to achieve thermionic emission) and indirectly heated cathode vacuum tubes (cathode is heated by a filament adjacent to it). (6) Vacuum tubes can be classified by shielding method into sharp-cutoff shielded vacuum tubes and remote-cutoff shielded vacuum tubes. (7) Vacuum tubes can be classified by cooling method into water-cooled vacuum tubes, air-cooled vacuum tubes, and natural convection-cooled vacuum tubes.

Westcode electrical component principle

1, Emitter injects electrons into the base region: The power supply Ub is applied across the emitter junction via resistor Rb, forward-biasing the emitter junction. The majority carriers (free electrons) in the emitter region continuously cross the emitter junction into the base region, forming the emitter current Ie. Simultaneously, majority carriers in the base region diffuse toward the emitter region, but since their concentration is much lower than that in the emitter region, this current can be neglected; thus, the emitter junction current is primarily electron flow. 2, Diffusion and recombination of electrons in the base region: After entering the base region, electrons initially accumulate near the emitter junction, gradually forming an electron concentration gradient. Under the influence of this gradient, electrons diffuse through the base region toward the collector junction and are swept into the collector region by the electric field, forming the collector current Ic. A very small portion of electrons (due to the thin base region) recombine with holes in the base region; the ratio of diffused electron current to recombined electron current determines the transistor's amplification capability. 3, Collector collects electrons: Due to the large reverse bias voltage applied to the collector junction, the resulting electric field prevents electrons in the collector region from diffusing into the base region and simultaneously pulls electrons diffusing near the collector junction into the collector region, thereby forming the main collector current Icn. Additionally, minority carriers (holes) in the collector region undergo drift motion toward the base region, forming a reverse saturation current denoted by Icbo, which is small in magnitude but highly sensitive to temperature.

Westcode electrical component performance

1. Protection characteristics: When the surge strength from the source does not exceed the specified value, the clamping voltage of the varistor must not exceed the impulse withstand voltage of the protected object. 2. Surge withstand characteristics: The varistor itself must be able to withstand the specified surge current, surge energy, and average power during successive surges. 3. Life characteristics include two aspects: one is the continuous operating voltage life, meaning the varistor should reliably operate for a specified duration (in hours) under specified ambient temperature and system voltage conditions; the other is surge life, meaning it can reliably withstand a specified number of surge impacts. 10. After the varistor is integrated into the system, in addition to its "safety valve" protection role, it introduces some additional effects, known as "secondary effects," which should not degrade the normal performance of the system. The main factors to consider are three: first, the inherent capacitance of the varistor; second, the leakage current under system voltage; and third, the impact of nonlinear current through source impedance coupling on other circuits.

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