BPM electrical components Germany BPM model BPM price

BPM electrical components are wires that transmit electric current. Current transmission is typically point-to-point. Power cords can be classified by application into AC AC power cords and DC DC power cords. Typically, AC power cords carry higher-voltage alternating current; due to the higher voltage, these cables must comply with unified standards and obtain safety certification before formal production. In contrast, DC cables generally carry lower-voltage direct current, so their safety requirements are not as stringent as those for AC cables. However, for safety reasons, countries still require unified safety certification.

BPM electrical component principle

Photoelectric sensors achieve control by converting changes in light intensity into changes in electrical signals. Generally, a photoelectric sensor consists of three parts: transmitter, receiver, and detection circuit. The transmitter emits a light beam towards the target. The emitted light beam usually comes from semiconductor light sources, such as light-emitting diodes (LED), laser diodes, and infrared emitting diodes. The light beam is emitted continuously or with changed pulse width. The receiver consists of photodiodes, phototransistors, and photocells. Optical components such as lenses and apertures are installed in front of the receiver. Behind it is the detection circuit, which filters out valid signals and applies them.

BPM electrical component structure

A solid-state relay consists of three parts: input circuit, isolation, and output circuit. According to different categories of input voltage, the input circuit can be divided into DC input circuit, AC input circuit, and AC/DC input circuit. Some input control circuits are also compatible with TTL/CMOS, featuring positive/negative logic control and inversion functions, allowing convenient connection with TTL and MOS logic circuits. For control signals with fixed control voltage, resistive input circuits are used. The isolation and coupling methods between the input and output circuits of solid-state relays include optocoupling and transformer coupling. Optocoupling usually uses photodiode-phototransistor, photodiode-bidirectional light-controlled thyristor, or photovoltaic cells to achieve isolated control between the control side and the load side. High-frequency transformer coupling utilizes the self-excited high-frequency signal generated by the input control signal, which is coupled to the secondary side, then demodulated, rectified, and processed by logic circuits to form a drive signal. The power switch of the solid-state relay is directly connected to the power supply and load terminals to realize on/off switching of the load power. Mainly used components include high-power bipolar transistors, unidirectional thyristors, bidirectional thyristors, power field-effect transistors, and insulated-gate bipolar transistors. The output circuit of a solid-state relay can also be divided into DC output circuit, AC output circuit, and AC/DC output circuit forms. According to the load type, it can be divided into DC solid-state relays and AC solid-state relays. Bipolar devices or power field-effect transistors can be used for DC output, while two thyristors or one bidirectional thyristor are usually used for AC output. AC solid-state relays can be further divided into single-phase AC solid-state relays and three-phase AC solid-state relays. AC solid-state relays can be classified into random-turn-on AC solid-state relays and zero-crossing AC solid-state relays based on the timing of conduction and turn-off.

BPM electrical component principle

1. Emission region emits electrons to the base region: Power supply Ub is applied to the emitter junction through resistor Rb. The emitter junction is forward-biased, and the majority carriers (free electrons) in the emission region continuously cross the emitter junction into the base region, forming emitter current Ie. At the same time, majority carriers in the base region also diffuse towards the emission region, but since their concentration is much lower than that of carriers in the emission region, this current can be ignored. Therefore, it can be considered that the emitter junction mainly consists of electron flow. 2. Diffusion and recombination of electrons in the base region: After entering the base region, electrons first accumulate near the emitter junction, gradually forming an electron concentration difference. Under the action of this concentration difference, electron flow diffuses in the base region towards the collector junction and is pulled into the collector region by the electric field of the collector junction, forming collector current Ic. A very small portion of electrons (because the base region is very thin) recombine with holes in the base region. The ratio of diffused electron flow to recombined electron flow determines the amplification capability of the transistor. 10. Collector region collects electrons: Since a large reverse voltage is applied externally to the collector junction, the electric field force generated by this reverse voltage prevents electrons in the collector region from diffusing into the base region, while simultaneously pulling electrons diffused near the collector junction into the collector region, thereby forming the main collector current Icn. In addition, minority carriers (holes) in the collector region also produce drift motion, flowing towards the base region to form reverse saturation current, represented by Icbo. Its value is very small, but it is extremely sensitive to temperature.

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