Schroeter electrical components Germany Schroeter model Schroeter price

Schroeter electrical components are switches controlled by electromagnets, that is, a combination of an electromagnet and a switch. When the electromagnet coil is energized, it generates electromagnetic attraction, causing the movable iron core to push or pull the switch contacts to close, thereby connecting the controlled circuit. Electromagnetic switches are widely used in various industries, most commonly as contactors in the industrial sector. An electromagnetic switch is the control switch on a starter motor and is one of the three major components of a starter (DC motor, transmission engagement mechanism, electromagnetic switch). Its working principle is that when the coil is energized, it generates electromagnetic attraction, causing the movable iron core to move, thereby on one hand pulling the transmission engagement mechanism to move the starter pinion forward to engage with the engine flywheel ring gear, and on the other hand pushing the switch contacts to connect, allowing the DC motor to be energized and operate, thereby driving the engine to start.

Schroeter electrical component functions

Antennas radiate radio waves and also receive radio waves. However, what the transmitter feeds into the antenna through the feeder is not radio waves, nor can the receiving antenna directly send radio waves into the receiver via the feeder; an energy conversion process must occur in between. Below, we take radio communication equipment as an example to analyze the signal transmission process, thereby illustrating the energy conversion role of the antenna. At the transmitting end, the modulated high-frequency oscillating current (energy) generated by the transmitter is input to the transmitting antenna via the feeding device (the feeding device can directly transmit current waves or electromagnetic waves depending on frequency and form). The transmitting antenna converts the high-frequency current or guided wave (energy) into radio waves—free electromagnetic waves (energy)—radiating them into the surrounding space. At the receiving end, radio waves (energy) are converted by the receiving antenna into high-frequency current or guided wave (energy), which is transmitted to the receiver via the feeding device. From the above process, it can be seen that the antenna is not only a device for radiating and receiving radio waves, but also an energy converter, serving as the interface device between the circuit and space.

Schroeter electrical component applications

The most basic application of a standard thyristor is controlled rectification. The diode rectifier circuit, which is familiar to everyone, belongs to uncontrolled rectifier circuits. If the diode is replaced with a thyristor, a controlled rectifier circuit can be formed. Taking the simplest single-phase half-wave controlled rectifier circuit as an example, during the positive half-cycle of the sinusoidal AC voltage U2, if there is no input trigger pulse Ug at the gate of VS, VS still cannot conduct. Only when U2 is in the positive half-cycle and an external trigger pulse Ug is applied to the gate, the thyristor is triggered to conduct. Draw its waveforms (c) and (d); only when the trigger pulse Ug arrives is there voltage UL output across the load RL. If Ug arrives early, the thyristor conducts earlier; if Ug arrives late, the thyristor conducts later. By changing the arrival time of the trigger pulse Ug at the gate, the average value of the output voltage UL across the load can be adjusted. In electrical engineering technology, half a cycle of AC power is often defined as 180°, called the electrical angle. Thus, in each positive half-cycle of U2, the electrical angle experienced from the zero value to the instant the trigger pulse arrives is called the control angle α; the electrical angle during which the thyristor conducts in each positive half-cycle is called the conduction angle θ. Obviously, both α and θ are used to represent the conduction or blocking range of the thyristor during the half-cycle where it withstands forward voltage. By changing the control angle α or the conduction angle θ, the average value UL of the pulsed DC voltage across the load is changed, achieving controlled rectification. Low-power plastic-packaged bidirectional thyristors are typically used in sound and light control lighting systems. Rated current is less than 2A. Large and medium-power plastic-packaged and metal-packaged thyristors are typically used in power-type controlled voltage regulation circuits, such as adjustable output DC power supplies, etc. High-power high-frequency thyristors are typically used in industry, such as in high-frequency melting furnaces, etc.

Schroeter electrical component principles

The AC power generated by the car alternator is converted into DC power after rectification by the rectifier, but its waveform still has 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 causes engine jitter, gear shift jerkiness, slow and weak acceleration, unstable idle speed, and low efficiency of the car air conditioner. This greatly reduces the performance and service life of onboard electrical equipment; coupled with the aging of the circuit system in older cars and the increase in circuit impedance, the impact on the vehicle becomes increasingly obvious. The role of the electronic rectifier is to help the car eliminate noise interference, 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, especially for small-displacement cars, where the effect is more noticeable. The semiconductor PN junction has a large current under forward bias and a small current under reverse bias. A rectifier diode is a PN junction diode that utilizes this unidirectional conductivity characteristic of the PN junction to convert AC current into DC. Devices with a current capacity below 1 amperes are usually called rectifier diodes, while those above 1 amperes are called rectifiers. Common semiconductor rectifiers include silicon rectifiers and selenium rectifiers, with many product specifications, voltages ranging from tens of volts 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, but 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 width 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 device cores connected in series, and their reverse withstand voltage is determined by the withstand voltage of the cores and the number of series-connected cores, with maximum withstand voltage 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 usually employed in silicon rectifiers to shorten the lifetime of injected minority carriers, thereby reducing recovery time. To reduce the possibility of device 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.

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