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Meltric electrical components are semiconductor triodes, also known as bipolar transistors or crystal triodes. They are semiconductor devices that control current. Their function is to amplify weak signals into electrical signals with larger amplitudes, and they are also used as contactless switches. Triodes are one of the basic semiconductor components, featuring current amplification capabilities, and are core components in electronic circuits. A triode is formed by creating two closely spaced PN junctions on a single semiconductor substrate. These two PN junctions divide the entire semiconductor into three parts: the middle part is the base region, and the two side parts are the emitter region and the collector region. The arrangement types include PNP and NPN.

Meltric electrical component structure

A solid-state relay consists of three parts: the input circuit, isolation, and output circuit. Depending on the input voltage category, the input circuit can be divided into DC input circuits, AC input circuits, and AC/DC input circuits. Some input control circuits are compatible with TTL/CMOS, featuring positive/negative logic control and inversion functions, allowing easy 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 pairs, photodiode-bidirectional light-controlled thyristors, or photovoltaic cells to achieve isolation 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, which are coupled to the secondary side, then demodulated, rectified, and processed by logic circuits to form drive signals. The power switch of the solid-state relay is directly connected to the power supply and load terminals to switch the load power on and off. Commonly used components include high-power crystal triodes, unidirectional thyristors, bidirectional thyristors, power field-effect transistors, and insulated-gate bipolar transistors. The output circuit of a solid-state relay 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 field-effect transistors can be used; for AC output, two thyristors or one bidirectional thyristor 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. Based on the timing of conduction and turn-off, AC solid-state relays can be classified into random-turn-on AC solid-state relays and zero-crossing AC solid-state relays.

Meltric electrical component function

Functions of capacitors: 1. Capacitors used in coupling circuits are called coupling capacitors. This type of capacitor circuit is widely used in RC-coupled amplifiers and other capacitor-coupled circuits to block DC and pass AC. 2. Capacitors used in filtering circuits are called filter capacitors. This type of capacitor circuit is used in power supply filters and various filter circuits; filter capacitors remove signals within a certain frequency band from the total signal. 2. Capacitors used in decoupling circuits are called decoupling capacitors. This type of capacitor circuit is used in the DC voltage supply circuits of multi-stage amplifiers; decoupling capacitors eliminate harmful low-frequency coupling between amplifier stages. 3. Capacitors used in high-frequency oscillation suppression circuits are called high-frequency oscillation suppression capacitors. In audio negative-feedback amplifiers, this type of capacitor circuit is employed to suppress potential high-frequency self-oscillation, thereby eliminating possible high-frequency whistling from the amplifier. 4. Capacitors used in LC resonant circuits are called resonant capacitors; this type of capacitor circuit is required in both LC parallel and series resonant circuits. 5. Capacitors used in bypass circuits are called bypass capacitors. If a specific frequency band needs to be removed from a signal, a bypass capacitor circuit can be used; depending on the frequency of the signal being removed, there are full-frequency-band (all AC signals) bypass capacitor circuits and high-frequency bypass capacitor circuits. 6. Capacitors used in neutralization circuits are called neutralization capacitors. This type of neutralization capacitor circuit is adopted in RF and IF amplifiers of radios and in RF amplifiers of televisions to eliminate self-oscillation. 7. Capacitors used in timing circuits are called timing capacitors. Timing capacitor circuits are used in circuits that require time control through capacitor charging and discharging; the capacitor serves to control the magnitude of the time constant. 8. Capacitors used in integration circuits are called integration capacitors. In synchronization separation circuits for vertical deflection scanning, this type of integration capacitor circuit is employed to extract the vertical synchronization signal from the vertical composite synchronization signal. 9. Capacitors used in differentiation circuits are called differentiation capacitors. In flip-flop circuits, this type of differentiation capacitor circuit is adopted to obtain peaked trigger signals, thereby deriving peaked pulse trigger signals from various (mainly rectangular pulse) signals. 10. Capacitors used in compensation circuits are called compensation capacitors. In the bass compensation circuit of a cassette deck, this type of low-frequency compensation capacitor circuit is used to boost low-frequency signals in the audio output; additionally, there are high-frequency compensation capacitor circuits. 11. Capacitors used in bootstrap circuits are called bootstrap capacitors. Common OTL power amplifier output stage circuits employ this type of bootstrap capacitor circuit to slightly increase the amplitude of the positive half-cycle of the signal through positive feedback. 12. Capacitors used in crossover networks are called crossover capacitors. In loudspeaker crossover networks for speakers, crossover capacitor circuits are used to ensure that tweeters operate in the high-frequency band, mid-range drivers operate in the mid-frequency band, and woofers operate in the low-frequency band. 13. This refers to the effective external capacitance that, together with the quartz crystal resonator, determines the load resonant frequency. Common standard values for load capacitance are 16pF, 20pF, 30pF, 50pF, and 108pF. The load capacitance can be appropriately adjusted according to specific conditions; through such adjustment, the operating frequency of the resonator can generally be tuned to its nominal value.

Meltric electrical component structure

The structure and materials of new high-voltage Schottky diodes differ from those of traditional Schottky diodes. Traditional Schottky diodes are formed by metal-semiconductor contact. Metals such as aluminum, gold, molybdenum, nickel, and titanium can be used, while the semiconductor is typically silicon or gallium arsenide. Since electrons have higher mobility than holes, N-type semiconductor material is selected as the substrate to achieve good frequency characteristics. To reduce the junction capacitance of the Schottky diode and increase the reverse breakdown voltage without causing excessive series resistance, a high-resistance N- thin layer is usually epitaxially grown on an N+ substrate. As is well known, metal conductors contain a large number of conductive electrons. When metal contacts a semiconductor (with a distance on the order of atomic size), the Fermi level of the metal is lower than that of the semiconductor. At the energy levels corresponding to the conduction band in the metal and semiconductor, the electron density in the metal is lower than that in the semiconductor conduction band. Therefore, upon contact, electrons diffuse from the semiconductor to the metal, causing the metal to become negatively charged and the semiconductor positively charged. Since metal is an ideal conductor, the negative charge is distributed only within a thin layer on the surface, on the order of atomic size. For N-type semiconductors, the donor impurity atoms that lose electrons become positive ions and are distributed over a larger thickness. The result of electron diffusion from the semiconductor to the metal forms a space charge region, a built-in electric field, and a potential barrier, with the depletion layer existing only on the N-type semiconductor side (the entire barrier region falls on the semiconductor side). The direction of the built-in electric field in the barrier region points from the N-type region toward the metal. As thermionic emission increases the built-in field, the drift current opposite to the diffusion current increases, eventually reaching dynamic equilibrium and forming a contact potential barrier between the metal and the semiconductor, known as the Schottky barrier. When the external voltage is zero, the electron diffusion current equals the reverse drift current, achieving dynamic equilibrium. When forward bias is applied (positive voltage to the metal, negative voltage to the semiconductor), the built-in field is weakened, the potential barrier on the semiconductor side is lowered, and a forward current flows from the metal to the semiconductor. When reverse bias is applied, the built-in field is strengthened, the potential barrier height increases, and a small reverse current flows from the semiconductor to the metal. Therefore, like PN junction diodes, SBD is a nonlinear device with unidirectional conductivity.

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