kira-leuchten electrical components Germany kira-leuchten model kira-leuchten price

kira-leuchten electrical component is a high-power electrical component, also known as a thyristor. It has the advantages of small size, high efficiency, and long service life. In automatic control systems, it can serve as a high-power drive device, enabling low-power control elements to control high-power equipment. It is widely used in AC/DC motor speed control systems, power regulation systems, and servo systems. Thyristors are divided into unidirectional thyristors and bidirectional thyristors. Bidirectional thyristors are also called triac bidirectional thyristors, abbreviated as TRIAC. A bidirectional thyristor is structurally equivalent to two unidirectional thyristors connected in reverse; this type of thyristor has bidirectional conduction capability. 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 a simple control circuit and no reverse voltage withstand issue, making it particularly suitable for use as an AC contactless switch.

kira-leuchten electrical component applications

Inductors in circuits mainly perform functions such as filtering, oscillation, delay, and notch filtering. They also filter signals, suppress noise, stabilize current, and inhibit electromagnetic interference. The most common function of an inductor in a circuit is to form an LC filter circuit together with a capacitor. Capacitors have the characteristic of blocking DC and passing AC, while inductors have the function of passing DC and blocking AC. If DC power accompanied by many interference signals passes through an LC filter circuit, the AC interference signals are converted into heat energy by the inductor and consumed. When the relatively pure DC current passes through the inductor, the AC interference signals within it are also converted into magnetic induction and heat energy. Higher frequencies are more easily impeded by the inductor's impedance, thereby suppressing high-frequency interference signals. Inductors have the characteristic of blocking AC while allowing DC to pass smoothly; the higher the frequency, the greater the coil impedance. Therefore, the main functions of inductors are to isolate and filter AC signals, or to form resonant circuits with capacitors, resistors, and other components.

kira-leuchten electrical component principle

The AC power generated by the automotive alternator is rectified into DC power by the 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 can easily lead to engine vibration, gear shift jerkiness, slow and weak acceleration, unstable idle speed, and low efficiency of the car air conditioning. This significantly reduces the performance and service life of onboard electrical equipment. Additionally, the aging of the electrical system in older vehicles and the resulting increase in circuit resistance make the impact on the vehicle increasingly apparent. The role of the electronic rectifier is to help eliminate clutter interference in the vehicle, stabilize output voltage, improve the instantaneous discharge capacity of the power system, increase torque output, accelerate throttle response, extend battery life, shorten engine start-up time, and improve ignition efficiency, with particularly noticeable effects on small-displacement vehicles. The semiconductor PN junction conducts high current under forward bias and low current under reverse bias. Rectifier diodes utilize this unidirectional conductivity of the PN junction to convert AC current into DC; they are a type of PN junction diode. Devices with a current capacity below 1 amperes are typically referred to as rectifier diodes, while those above 4 amperes are called 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, these 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 rectification devices. High-voltage silicon stacks are often used in high-voltage rectification devices; they consist of multiple rectifier die connected in series. Their reverse voltage withstand capability is determined by the voltage withstand of the die and the number of series-connected die, with maximum withstand voltages reaching hundreds of kilovolts. If a high-frequency rectification circuit is used at very high frequencies, when the period of the AC voltage is comparable to the recovery time of the rectifier from the on-state to the off-state, the rectifier no longer performs rectification on the high-frequency voltage. To adapt to high-frequency operation, gold doping is usually employed 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. Exposed junction areas 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, the high-voltage AC power from the grid is converted into DC power by the rectifier.

kira-leuchten electrical component features

The self-resetting fuse is characterized by a high breaking current capacity, capable of interrupting AC and even higher currents. This fuse has a very significant current-limiting effect; when the instantaneous current approaches 168 kiloamperes, it can rapidly limit the current. The structure of the self-resetting fuse mainly consists of current terminals (also called electrodes), mica glass (filler), insulating tube, fusible element, piston, argon gas, and housing. The housing of the self-resetting fuse is generally made of stainless steel. The stainless steel sleeve is separated from the internal beryllium oxide ceramic insulating tube by mica glass, which serves as both filler and insulator. The self-resetting fuse operates based on the characteristic of sodium metal, whose resistance increases sharply at high temperatures. Under normal operating conditions, current flows from the left current terminal, through the sodium metal fusible element in the fine holes of the beryllium oxide ceramic insulating tube, to the right current terminal, forming a current path. When a short-circuit fault occurs, the short-circuit current heats the sodium metal, vaporizing it into a high-temperature, high-pressure plasma state, which drastically increases its resistance, thereby achieving current limiting. At this point, the high pressure generated by the vaporized fusible element pushes the piston to the right, compressing the argon gas. After the circuit breaker interrupts the short-circuit current limited by the self-resetting fuse, the temperature of the sodium vapor drops, and the pressure decreases accordingly. The previously compressed argon gas condenses back into liquid and solid states, and its resistance value returns to the original level, allowing for reuse. Regarding the wiring of the self-resetting fuse, it is often used in series with a circuit breaker. An additional resistor is connected in parallel with the fuse itself to suppress overvoltage during interruption. During normal operation, the self-resetting fuse is in a low-resistance state, and only a small current flows through the parallel resistor. When a fault occurs in the line, the self-resetting fuse enters a high-resistance state. The parallel resistor absorbs the resulting overvoltage and maintains the operating current required for the circuit breaker trip unit, ensuring reliable interruption by the circuit breaker. Therefore, the current interrupted by the circuit breaker is actually the current-limited value provided by the self-resetting fuse.

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