FULGUR electrical components, German FULGUR models, FULGUR pricing

FULGUR electrical components are high-power electronic components, also known as thyristors. They offer advantages such as compact size, high efficiency, and long service life. In automatic control systems, they can serve as high-power drive devices, enabling low-power control elements to manage high-power equipment. They are widely used in AC/DC motor speed control systems, power regulation systems, and servo systems. Thyristors are categorized into unidirectional and bidirectional types. Bidirectional thyristors are also called triacs, abbreviated as TRIAC. Structurally, a bidirectional thyristor is equivalent to two unidirectional thyristors connected in reverse parallel; this type of thyristor provides bidirectional conduction. Its on/off state is determined by the gate G. Applying a positive pulse (or negative pulse) to the gate G enables forward (or reverse) conduction. The advantages of this device include simple control circuitry and no reverse voltage withstand issues, making it particularly suitable for use as an AC contactless switch.

FULGUR electrical component principles

When two different conductors or semiconductors A and B form a loop with their ends interconnected, an electromotive force (EMF) is generated in the loop as long as the temperatures at the two junctions differ. One junction, at temperature T, is called the working end or hot end; the other, at temperature T0, is called the free end or cold end. The direction and magnitude of this EMF depend on the conductor materials and the temperatures of the two junctions. This phenomenon is known as the "thermoelectric effect." The loop formed by the two conductors is called a "thermocouple," the conductors are termed "thermoelectrodes," and the generated EMF is called "thermo-EMF." Thermo-EMF consists of two components: the contact EMF between the two conductors and the temperature-difference EMF within a single conductor. In a thermocouple loop, the magnitude of the thermo-EMF depends only on the conductor materials and the junction temperatures, not on the shape or dimensions of the thermocouple. Once the thermocouple electrode materials are fixed, the thermo-EMF is a function of the difference between the junction temperatures t and t0. This relationship is widely applied in practical temperature measurement. Since the cold end t0 remains constant, the thermo-EMF generated by the thermocouple varies only with the temperature of the hot end (measurement end); thus, a specific thermo-EMF corresponds to a specific temperature. Temperature measurement is achieved by measuring the thermo-EMF. The basic principle of thermocouple temperature measurement is that a closed loop formed by two dissimilar material conductors generates current when a temperature gradient exists between the ends, producing an EMF—thermo-EMF—between them, known as the Seebeck effect. The two homogeneous dissimilar conductors serve as thermoelectrodes; the higher-temperature end is the working end, and the lower-temperature end is the free end, which is typically maintained at a constant temperature. Based on the functional relationship between thermo-EMF and temperature, thermocouple calibration tables are established; these tables are derived under the condition that the free end temperature is 7 °C, and different thermocouples have different calibration tables. When a third metal material is introduced into the thermocouple loop, the thermo-EMF remains unchanged provided the temperatures at its two junctions are identical, meaning it is unaffected by the inclusion of the third metal. Therefore, during thermocouple temperature measurement, measuring instruments can be connected; once the thermo-EMF is measured, the temperature of the measured medium can be determined. Thermocouple temperature measurement requires the cold end temperature (the end connected via lead wires to the measurement circuit, while the measurement end is the hot end) to remain constant so that the thermo-EMF maintains a proportional relationship with the measured temperature. If the cold end (ambient) temperature changes during measurement, it will significantly affect measurement accuracy. Compensating for the impact of cold end temperature variations is known as thermocouple cold junction compensation. Dedicated compensation cables are used for connection to measuring instruments. Thermocouple cold junction compensation calculation methods: (1) From millivolts to temperature: Measure the cold end temperature, convert it to the corresponding millivolt value, add it to the thermocouple's millivolt reading, and convert the sum to temperature; (2) From temperature to millivolts: Measure the actual temperature and the cold end temperature, convert each to millivolt values, subtract them to obtain the net millivolt value, which corresponds to the temperature.

FULGUR electrical component parameters

Key transistor parameters include current amplification factor, power dissipation, frequency characteristics, maximum collector current, maximum reverse voltage, and reverse current. Amplification factor: The DC current amplification factor, also known as the static current amplification factor or DC gain, is the ratio of collector current to base current in a transistor under static conditions with no input signal variation. AC gain: The AC gain, also referred to as the AC current amplification factor or dynamic current amplification factor, is the ratio of the change in collector current to the change in base current under AC conditions. Power dissipation: Power dissipation, also known as the maximum allowable collector power dissipation PCM, is the maximum collector power dissipation when transistor parameter variations remain within specified allowable limits. Power dissipation is closely related to the transistor's maximum allowable junction temperature and maximum collector current. During operation, the actual power consumption of a transistor must not exceed the PCM value; otherwise, overload damage may occur. When a transistor's operating frequency exceeds its cutoff frequency, its current amplification factor decreases as frequency increases. The maximum oscillation frequency is the frequency at which the transistor's power gain drops to 3. Typically, the maximum oscillation frequency of high-frequency transistors is lower than the common-base cutoff frequency, while the characteristic frequency is higher than the common-base cutoff frequency but lower than the common-collector cutoff frequency. Maximum current: The maximum collector current is the highest current allowed to pass through the transistor's collector. Maximum reverse voltage: The maximum reverse voltage is the highest operating voltage permitted during transistor operation. It includes the collector-emitter reverse breakdown voltage, collector-base reverse breakdown voltage, and emitter-base reverse breakdown voltage. Collector reverse breakdown voltage is the maximum allowable reverse voltage between the collector and emitter when the transistor base is open. Base reverse breakdown voltage is the maximum allowable reverse voltage between the collector and base when the transistor emitter is open. Emitter reverse breakdown voltage is the maximum allowable reverse voltage between the emitter and base when the transistor collector is open. The reverse current between the base and collector, also known as the collector junction reverse leakage current, is the reverse current between the collector and base when the transistor emitter is open. The reverse breakdown current between the emitter and collector, also known as punch-through current, is the reverse leakage current between the collector and emitter when the transistor base is open. A lower value of this current indicates better transistor performance.

FULGUR electrical component types

Common thermocouples are classified into standard and non-standard types. Standard thermocouples are those for which national standards define the relationship between thermo-EMF and temperature, allowable errors, and provide unified standard calibration tables; compatible display instruments are available for selection. Non-standard thermocouples have more limited application ranges or magnitudes compared to standard ones and generally lack unified calibration tables; they are primarily used for measurements in special applications. Theoretically, any two different conductors (or semiconductors) can form a thermocouple, but practical temperature-sensing elements must meet multiple requirements. To ensure reliability in engineering applications and sufficient measurement precision, not all materials are suitable for thermocouples. Basic requirements for thermocouple electrode materials include: 1 Stable thermoelectric properties within the measurement range, without change over time, sufficient physical and chemical stability, and resistance to oxidation or corrosion; 2 Low temperature coefficient of resistance, high conductivity, and low specific heat; 3 Large thermo-EMF generation during temperature measurement, with a linear or near-linear single-valued functional relationship between thermo-EMF and temperature; 6 Good material reproducibility, high mechanical strength, simple manufacturing process, and low cost.

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