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EFFEKTA power supply electrical components are varactor diodes, also known as "variable reactance diodes," made by utilizing the characteristic that the junction capacitance of a PN junction under reverse bias changes with the applied voltage. As the reverse bias voltage increases, the junction capacitance decreases; conversely, the junction capacitance increases. The capacitance of a varactor diode is generally small, with a maximum value ranging from tens of pF to hundreds of pF. It is mainly used in high-frequency circuits for automatic tuning, frequency modulation, and phase adjustment, for example, as a variable capacitor in the tuning circuit of a television receiver. The main parameters are: zero-bias junction capacitance, zero-bias quality factor, reverse breakdown voltage, center reverse bias voltage, nominal capacitance, capacitance variation range (in picofarads), and cutoff frequency.

EFFEKTA power supply electrical component composition

A diode is formed by a PN junction plus corresponding electrode leads and package encapsulation. Using different doping processes and diffusion, P-type semiconductor and N-type semiconductor are fabricated on the same semiconductor substrate (usually silicon or germanium), forming a space charge region at their interface called the PN junction. The electrode drawn from the P region is called the anode, and the electrode drawn from the N region is called the cathode. Due to the unidirectional conductivity of the PN junction, when the diode conducts, the current flows from the anode through the interior of the tube to the cathode. A diode has two electrodes; the electrode drawn from the P region is the positive pole, also called the anode; the electrode drawn from the N region is the negative pole, also called the cathode.

EFFEKTA power supply electrical component structure

1. The cathode of an electron tube is the component used to emit electrons, divided into oxide cathodes and thoriated tungsten carbide cathodes. Generally, oxide cathodes are indirectly heated; they use a dedicated filament to heat the cathode body coated with barium oxide, etc., for thermionic emission. Thoriated tungsten carbide cathodes are generally directly heated; thermionic emission is produced simply by heating, so it serves as both the filament and the cathode. Theoretically, thoriated tungsten carbide cathodes have a much longer lifespan than oxide cathodes. Thoriated tungsten carbide cathodes are most widely used in high-power transmitter tubes, while oxide cathodes are generally used in transmitter tubes with output power below 1kW. Mesh cathodes are made into a cylindrical shape using thinner thoriated tungsten wires. Their advantages are: (1) Because they are woven from many thoriated tungsten wires, the conduction coefficient is relatively large. (2) It is easy to achieve a smaller cathode-grid spacing, which helps improve transconductance. (3) Since the filament has a mesh structure, the current in each single filament is small, the local magnetic field is weak, and thus the hum generated by the cathode current is also small. 2. The grids of electron tubes are divided into first grid and second grid according to their different roles in the tube, sometimes also called control grid and screen grid. The main role of the first grid is to control the cathode current, and the role of the second grid is to shield the first grid from the influence of the plate. The grid structure relates to its own mechanical strength and heat dissipation effect, and determines whether the tube can work stably. To reduce electron transit time, the grid-cathode spacing is made very short, even less than 1mm, so manufacturers mostly use materials with high mechanical strength, high thermal conductivity, good radiation coefficient, and high melting point to make the grids, to avoid thermal contact between electrodes at such small spacings. The first grid and second grid should be strictly aligned, so that the screen grid captures fewer electrons, reducing screen grid dissipation, improving current distribution and linearity. 10. The anode of an electron tube is the electrode that collects most of the electrons emitted by the cathode. When the electron tube is working, due to electron bombardment of the plate surface and thermal radiation from other electrodes, a large amount of heat energy is generated at the plate. Since the power dissipation density of the plate is tens to hundreds of watts per square centimeter, natural radiation or conduction cooling is no longer sufficient for such high power density. Therefore, forced cooling methods must be used. Common methods include air cooling, water cooling, and evaporative cooling.

EFFEKTA power supply electrical component types

1, Classification by fixed device type: Thermocouples are the primary means of temperature measurement and are widely used, so there are various requirements for fixed devices and technical performance. Therefore, thermocouple fixed devices are divided into six types: no fixed device type, threaded type, fixed flange type, movable flange type, movable flange angle form, and conical protection tube type. 9, Classification by assembly and structural method: According to the performance and structural method, thermocouples can be divided into: detachable thermocouples, explosion-proof thermocouples, armored thermocouples, and spring-loaded fixed thermocouples for special purposes.

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