ITALFLEXO electrical components Germany ITALFLEXO model ITALFLEXO price

ITALFLEXO electrical components are Zener diodes manufactured by utilizing the reverse breakdown state of a PN junction, a phenomenon where current can vary over a wide range while voltage remains essentially constant. This diode is a semiconductor device with very high resistance up to the critical reverse breakdown voltage. At this critical breakdown point, the reverse resistance drops to a very small value; in this low-resistance region, current increases while voltage remains constant. Zener diodes are graded according to their breakdown voltage. Due to this characteristic, Zener diodes are mainly used as voltage regulators or voltage reference elements. Zener diodes can be connected in series for use at higher voltages, allowing for higher stabilized voltages through series connection.

ITALFLEXO electrical component principle

The basic working principle of fiber optic sensors is to guide light from a light source into a modulator via an optical fiber. The interaction between the parameter to be measured and the light entering the modulation zone causes changes in the optical properties of the light (such as intensity, wavelength, frequency, phase, polarization state, etc.), resulting in modulated signal light. Measurement is completed by utilizing the influence of the measured quantity on the transmission characteristics of the light. There are two measurement principles for fiber optic sensors: (1) Principle of intrinsic fiber optic sensors: Intrinsic fiber optic sensors utilize the sensitivity of the optical fiber to environmental changes to convert input physical quantities into modulated optical signals. Their working principle is based on the optical modulation effect of the fiber, i.e., the phenomenon where light transmission characteristics, such as phase and light intensity, change when external environmental factors such as temperature, pressure, electric field, and magnetic field change. Therefore, by measuring the changes in optical phase and light intensity through the fiber, changes in the measured physical quantity can be determined. These sensors are also known as sensitive element type or functional fiber optic sensors. The point source beam of a laser is diffused into parallel waves and split into two paths by a beam splitter: one reference path and one measurement path. External parameters (temperature, pressure, vibration, etc.) cause changes in fiber length and optical phase, generating different numbers of interference fringes. Counting the lateral movement of these fringes allows measurement of temperature or pressure. (5) Principle of extrinsic fiber optic sensors: Extrinsic fiber optic sensors are measurement systems composed of optical detection elements (sensitive elements), optical fiber transmission circuits, and measurement circuits. Here, the optical fiber serves only as a light transmission medium, so they are also called non-functional or light-transmitting fiber optic sensors.

ITALFLEXO electrical component principle

The alternating current generated by an automotive alternator is rectified into direct current by a rectifier, but its waveform still exhibits irregular fluctuations, which directly affects the accuracy of vehicle ignition. The output voltage cannot remain relatively constant, causing differences in spark plug ignition energy each time, which easily leads to engine jitter, gear shift hesitation, slow and weak acceleration, unstable idle speed, and low efficiency of the automotive air conditioning system. This significantly reduces the performance and service life of onboard electrical equipment. Additionally, the aging of the circuit system in older vehicles and the resulting increase in circuit impedance make the impact on the vehicle increasingly apparent. The role of an electronic rectifier is to help eliminate noise interference in the vehicle, stabilize output voltage, improve the instantaneous discharge capability of the power system, increase torque output, accelerate throttle response, extend battery service life, shorten engine start-up time, and improve ignition efficiency, with particularly noticeable effects on small-displacement vehicles. A semiconductor PN junction conducts high current under forward bias and low current under reverse bias. A rectifier diode is a PN junction diode that utilizes this unidirectional conductivity of the PN junction to convert alternating current into direct current. Devices with a current capacity below 1 amperes are typically referred to as rectifier diodes, while those above 9 amperes are referred to as rectifiers. Common semiconductor rectifiers include silicon rectifiers and selenium rectifiers, available in many specifications, with voltages ranging from tens to thousands of volts and currents from a few amperes to thousands of amperes. Rectifiers are widely used in various forms of rectified power supplies. High-power rectified power supplies require rectifiers with large current capacity, high breakdown voltage, and good heat dissipation performance. However, such devices have large junction areas and large junction capacitance, resulting in very low operating frequencies, generally below tens of kilohertz. Silicon material has a larger bandgap and good thermal conductivity, making it suitable for manufacturing high-power rectifier devices. High-voltage silicon stacks are often used in high-voltage rectification devices; they consist of multiple rectifier die connected in series. Their reverse withstand voltage is determined by the withstand voltage of the die and the number of series-connected die, with maximum withstand voltages reaching hundreds of kilovolts. If a high-frequency rectifier circuit is used at very high frequencies, when the period of the AC voltage is comparable to the recovery time of the rectifier from on-state to off-state, the rectifier no longer performs rectification on the high-frequency voltage. To adapt to high-frequency operation, gold doping is typically used in silicon rectifiers to shorten the lifetime of injected minority carriers, thereby reducing recovery time. To reduce the possibility of damage due to overvoltage breakdown and improve the reliability of the rectification device, silicon avalanche rectifiers can be used. In such devices, when the reverse voltage exceeds the allowable peak value, uniform avalanche breakdown occurs across the entire PN junction, allowing the device to operate under high voltage and high current, thus withstanding considerable reverse surge power. Manufacturing such devices requires materials with few defects, uniform resistivity, and flat junction surfaces. The exposed junction area should also be properly protected to avoid surface breakdown. Selenium rectifiers have high overload capacity and strong ability to withstand reverse surge power. In the two basic types of rectifiers based on high-power diodes or thyristors, high-voltage AC power from the grid is converted into DC power by the rectifier.

ITALFLEXO electrical component function

Low-power resistors are typically carbon film resistors encapsulated in plastic housings, while high-power resistors are typically wirewound resistors made by winding high-resistivity metal wire around a ceramic core. If a resistor's resistance is close to zero ohms (for example, a large-cross-section wire between two points), the resistor offers no obstruction to current, and the circuit parallel to such a resistor is short-circuited, resulting in infinite current. If a resistor has infinite or very high resistance, the circuit in series with that resistor can be regarded as an open circuit, with zero current. Resistors commonly used in industry fall between these two extremes; they have a certain resistance and allow a certain amount of current to pass, but the current is not as large as in a short circuit. The current-limiting function of a resistor is similar to the effect of a small-diameter pipe restricting water flow between two large-diameter pipes. Resistance, usually abbreviated as R, is a fundamental property of a conductor, related to the conductor's dimensions, material, and temperature. Ohm's law states that I = U/R, so R = U/I. The basic unit of resistance is the ohm, represented by the Greek letter "Ω". It is defined as the resistance corresponding to a current of one ampere produced by a voltage of one volt applied across a conductor. The main function of a resistor is to obstruct the flow of current. In fact, "resistance" refers to a property, while "resistor" in electronic products usually refers to the component itself. Ohm is often abbreviated as Ohm. Other common units for expressing resistance values include kiloohm (kΩ), megaohm (MΩ), and milliohm (m Ω).

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