Vishay Electro-Films electrical components German Vishay Electro-Films models Vishay Electro-Films prices

Vishay Electro-Films electrical components consist of two conductors placed close to each other with a non-conductive insulating dielectric layer in between, forming a capacitor. When voltage is applied across the two plates of the capacitor, it stores charge. The capacitance value is numerically equal to the ratio of the charge on one conductive plate to the voltage between the two plates. The basic unit of capacitance is the Farad (F). In circuit diagrams, the letter C is commonly used to represent capacitive elements; capacitors are components that store electric charge and electrical energy (electric potential energy). A system where one conductor is enclosed by another, or where all electric field lines originating from one conductor terminate on another conductor, is called a capacitor.

Vishay Electro-Films electrical component composition

Transformer components include the core assembly (core, windings, insulation, leads), transformer oil, tank and cooling device, voltage regulation device, protection devices (breather, safety air vent, gas relay, oil conservator, and temperature measuring device, etc.), and output bushings. Specific composition and functions: (1) The core is the main magnetic circuit part of the transformer. It is usually made of stacked hot-rolled or cold-rolled silicon steel sheets with high silicon content and surface-coated with insulating varnish. The core is divided into two parts: the core column and the yoke. The windings are mounted on the core column; the yoke is used to close the magnetic circuit. (2) The winding is the circuit part of the transformer, wound with double-insulated flat wire or enamel-coated round wire. The basic principle of a transformer is electromagnetic induction. Taking a single-phase two-winding transformer as an example to explain its basic working principle: when voltage is applied to the primary winding, current flows, generating alternating magnetic flux in the core. This flux is called the main flux. Under its influence, electromotive force is induced in the windings on both sides, finally driving the transformer control device.

Vishay Electro-Films electrical component principles

It mainly consists of an LC circuit composed of capacitors and inductors, producing free oscillation through the mutual conversion of electric field energy and magnetic field energy. To sustain oscillation, an amplifier circuit with positive feedback is required. LC oscillators are further divided into transformer-coupled oscillators and three-point oscillators. Many applications use quartz crystal oscillators, and there are also LC oscillators composed of integrated operational amplifiers. Since component parameters cannot be exactly identical, the states of the two transistors change at the moment of power-on. This change becomes increasingly strong due to positive feedback, leading to a quasi-stable state. During the quasi-stable period, the other transistor gradually charges via the capacitor and then conducts or cuts off, causing the state to flip to another quasi-stable state. This cycle repeats to form oscillation.

Vishay Electro-Films electrical component characteristics

The most important characteristic of a diode is its unidirectional conductivity. In a circuit, current can only flow into the anode of the diode and out of the cathode. 1. Forward characteristics: In electronic circuits, when the anode of the diode is connected to a high potential terminal and the cathode to a low potential terminal, the diode conducts. This connection method is called forward bias. It must be noted that when the forward voltage applied across the diode is very small, the diode still does not conduct, and the forward current flowing through it is very weak. Only when the forward voltage reaches a certain value can the diode truly conduct. After conduction, the voltage across the diode remains basically constant, known as the "forward voltage drop" of the diode. 6. Reverse characteristics: In electronic circuits, when the anode of the diode is connected to a low potential terminal and the cathode to a high potential terminal, almost no current flows through the diode, and the diode is in a cut-off state. This connection method is called reverse bias. When the diode is reverse-biased, a weak reverse current, called leakage current, still flows through it. When the reverse voltage across the diode increases to a certain value, the reverse current increases sharply, and the diode loses its unidirectional conductivity. This state is called diode breakdown. The injection current of a laser diode must be greater than the critical current density to satisfy the population inversion condition and emit laser light. The critical current density is related to the junction temperature and indirectly affects efficiency. During high-temperature operation, the critical current increases, efficiency decreases, and components may even be damaged.

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