Legamaster electrical components German Legamaster models Legamaster prices

Legamaster electrical components are sensor resistors whose resistance changes with temperature. Based on different temperature coefficients, they are classified into positive temperature coefficient thermistors and negative temperature coefficient thermistors. The resistance of a positive temperature coefficient thermistor increases as temperature rises, while the resistance of a negative temperature coefficient thermistor decreases as temperature rises; both belong to semiconductor devices.

Legamaster electrical component principles

Light emission principle of laser diodes: The P-N junction in a laser diode is formed by two doped gallium arsenide layers. It features a planar structure parallel to a mirror at one end (highly reflective surface) and a partially reflective surface at the other. The wavelength of the emitted light is directly related to the length of the junction. When the P-N junction is forward-biased by an external voltage source, electrons move through the junction and recombine as in ordinary diodes. When electrons recombine with holes, photons are released. These photons strike atoms, causing more photons to be released. As the forward bias current increases, more electrons enter the depletion region, leading to the emission of more photons. Eventually, some photons drifting randomly within the depletion region strike the reflective surfaces perpendicularly and are reflected back along their original paths. The reflected photons are again reflected from the other end of the junction. This movement of photons from one end to the other occurs continuously multiple times. During photon movement, due to the avalanche effect, more atoms release more photons. This process of reflection and generation of increasing numbers of photons produces a very intense laser beam. Each photon generated in the emission process described above is identical to other photons in energy level, phase relationship, and frequency. Therefore, the emission process yields a laser beam of a single wavelength. To generate a laser beam, the current of the laser diode must exceed a certain threshold level. Current below the threshold level forces the diode to behave as an LED, emitting incoherent light.

Legamaster electrical component principles

In chemical batteries, the direct conversion of chemical energy into electrical energy results from spontaneous oxidation-reduction and other chemical reactions occurring inside the battery; these reactions take place at two electrodes. The active material at the negative electrode consists of reducing agents with more negative potentials that are stable in the electrolyte, such as active metals like zinc, cadmium, and lead, as well as hydrogen or hydrocarbons. The active material at the positive electrode consists of oxidizing agents with more positive potentials that are stable in the electrolyte, such as metal oxides like manganese dioxide, lead dioxide, and nickel oxide, oxygen or air, halogens and their salts, oxyacids and their salts, etc. The electrolyte is a material with good ionic conductivity, such as aqueous solutions of acids, alkalis, and salts, organic or inorganic non-aqueous solutions, molten salts, or solid electrolytes. When the external circuit is open, although there is a potential difference (open-circuit voltage) between the two electrodes, no current flows, and the chemical energy stored in the battery is not converted into electrical energy. When the external circuit is closed, current flows through the external circuit under the influence of the potential difference between the two electrodes. Simultaneously, inside the battery, since there are no free electrons in the electrolyte, charge transfer must accompany oxidation or reduction reactions at the interface between the active materials of the two electrodes and the electrolyte, as well as mass transfer of reactants and reaction products. Charge transfer in the electrolyte is also accomplished by ion migration. Therefore, normal charge and mass transfer processes inside the battery are necessary conditions for ensuring normal electrical energy output. During charging, the direction of charge and mass transfer processes inside the battery is exactly opposite to that during discharge; electrode reactions must be reversible to ensure the normal progress of reverse mass and charge transfer processes. Therefore, reversibility of electrode reactions is a necessary condition for constituting a storage battery. This is the basic thermodynamic relationship between battery electromotive force and battery reactions, and also the basic thermodynamic equation for calculating battery energy conversion efficiency. In practice, when current flows through electrodes, the electrode potential deviates from the thermodynamically balanced electrode potential; this phenomenon is called polarization. The greater the current density (current passing through unit electrode area), the more severe the polarization. Polarization is one of the important causes of battery energy loss. There are three causes of polarization: (1) Polarization caused by the resistance of various parts within the battery is called ohmic polarization; (2) Polarization caused by the hindrance of charge transfer processes in the electrode-electrolyte interface layer is called activation polarization; (3) Polarization caused by sluggish mass transfer processes in the electrode-electrolyte interface layer is called concentration polarization. Methods to reduce polarization include increasing the electrode reaction area, reducing current density, raising the reaction temperature, and improving the catalytic activity of the electrode surface.

Legamaster electrical component classification

Standard power supplies can be subdivided into: switching power supplies, inverter power supplies, AC stabilized power supplies, DC stabilized power supplies, DC/DC power supplies, communication power supplies, module power supplies, variable frequency power supplies, UPS power supplies, EPS emergency power supplies, purified power supplies, PC power supplies, rectifier power supplies, custom power supplies, heating power supplies, welding/arc power supplies, electroplating power supplies, network power supplies, power operation power supplies, adapter power supplies, linear power supplies, power controllers/drivers, high-power supplies, other standard power supplies, parameter power supplies, voltage-regulating power supplies, transformer power supplies. Special-purpose power supplies can be subdivided into: shore power supplies, security power supplies, high-voltage power supplies, medical power supplies, military power supplies, aerospace power supplies, laser power supplies, other special-purpose power supplies.

Weidou Intelligent Technology specializes in selling German Legamaster connectors, Legamaster switches, Legamaster relays, Legamaster controllers, Legamaster plugs, Legamaster sensors, Legamaster resistors, Legamaster capacitors, Legamaster buses, Legamaster modules, Legamaster cables, Legamaster power supplies, Legamaster interfaces, Legamaster gateways, Legamaster circuit breakers, Legamaster original imports from Germany. We welcome inquiries and orders from users.