CDC electrical components Germany CDC model CDC price

CDC electrical components utilize the good conductivity and fluidity of mercury to control the opening and closing of electrical circuits. They consist of a glass tube, mercury, fixed electrodes, lead wires, etc. After evacuating the air from the tube, it is filled with various gases and sealed. They are suitable for environments with dust, oil, water vapor, and corrosive gases, and can also be used as explosion-proof switches in environments with explosive gases. Due to the high surface tension and specific gravity of the mercury inside the tube, as well as its fluidity, the position of the mercury changes immediately when the glass tube is slightly tilted, making surface contact with the electrodes, thus allowing it to switch large AC and DC currents. In addition, this type of switch features a service life of several million cycles at rated current, small size, high sensitivity, no mechanical noise, and low price, so it has always been used as a switch for automatic control.

CDC electrical component principle

LCD is a display that uses liquid crystal as the material. Liquid crystals are a class of organic compounds between solid and liquid states. At room temperature, they exhibit both the fluidity of liquids and the optical anisotropy of crystals. They become a transparent liquid when heated and a crystalline turbid solid when cooled. Under the action of an electric field, the arrangement of liquid crystal molecules changes, affecting the intensity of incident light passing through the liquid crystal. This change in light intensity is further manifested as a change in brightness through the action of polarizers. Based on this, controlling the electric field of the liquid crystal can achieve changes in light brightness, thereby achieving the purpose of information display. Therefore, the role of liquid crystal material is similar to that of small "light valves." Since there are control circuits and drive circuits around the liquid crystal material, when the electrodes in the LCD generate an electric field, the liquid crystal molecules twist, regularly refracting the light passing through them (optical rotation of the liquid crystal material), which is then filtered by the second layer of polarizer and displayed on the screen. It is worth noting that because liquid crystal materials do not emit light themselves, LCD usually requires an additional light source for the display panel. The main light source system is called the "backlight module," in which the backlight plate is composed of fluorescent materials that can emit light, primarily providing a uniform backlight source.

CDC electrical component classification

(1) Point-contact diodes have a small PN junction contact area, cannot pass large forward currents or withstand high reverse voltages, but have good high-frequency performance, making them suitable for use in high-frequency detection circuits and switching circuits. (2) Surface-contact diodes have a large PN junction contact area, can pass large currents, and can withstand high reverse voltages, making them suitable for use in rectifier circuits. (3) Planar diodes have a small PN junction area when used as switching tubes in pulse digital circuits, and a larger PN junction area when used for high-power rectification. (4) Zener diodes are a special type of surface-contact semiconductor silicon diode with a voltage stabilization function. The main difference between zener diodes and ordinary diodes is that zener diodes operate in the reverse breakdown state of the PN junction. By implementing process measures during manufacturing and limiting the magnitude of the reverse current during use, it is ensured that the zener diode will not be damaged by overheating in the reverse breakdown state. Unlike general diodes, the reverse breakdown of a zener diode is reversible; as long as the allowable value of the zener current is not exceeded, the PN junction will not be damaged by overheating. When the external reverse voltage is removed, the zener diode restores its original performance, so zener diodes have good repetitive breakdown characteristics. (5) Photodiodes, also known as photosensitive diodes, have a glass window on their casing to facilitate light reception. Their characteristic is that when light irradiates their PN junction, free electrons and holes are generated in pairs, increasing the concentration of minority carriers in the semiconductor. Under a certain reverse bias voltage, this causes the reverse current to increase. Therefore, their reverse current increases linearly with increasing light intensity. When there is no light, the volt-ampere characteristics of a photodiode are the same as those of an ordinary diode. Photodiodes can be used as light-controlled components in various applications such as object detection, photoelectric control, and automatic alarms. When made into large-area photodiodes, they can serve as an energy source and are called solar cells. In this case, they do not require an external power supply and can directly convert light energy into electrical energy. (6) Light-emitting diodes are semiconductor solid-state display devices that directly convert electrical energy into light energy, abbreviated as LED. Similar to ordinary diodes, light-emitting diodes are also composed of a PN structure. The PN junction of a light-emitting diode is encapsulated in a transparent plastic shell, with shapes including square, rectangular, and circular. Light-emitting diodes have advantages such as low drive voltage, small operating current, strong resistance to vibration and shock, small size, high reliability, low power consumption, and long life, and are widely used in signal indication circuits. In electronic technology, the commonly used numeric displays operate on the opposite principle to photodiodes. When a light-emitting diode is forward-biased and current passes through it, it emits light, which is the result of energy release when electrons and holes recombine directly. Its spectral range is relatively narrow, and its wavelength depends on the basic material used.

CDC electrical component characteristics

Operating characteristics: The main characteristics characterizing the performance of a synchronous generator are the no-load characteristic and the load operating characteristic. These characteristics are an important basis for users to select generators. No-load characteristic: When the generator is not connected to a load, the armature current is zero, which is called no-load operation. Armature reaction: When the generator is connected to a symmetrical load, the three-phase current in the armature winding produces another rotating magnetic field, called the armature reaction magnetic field. Its speed is exactly equal to the rotor speed, and the two rotate synchronously. The armature reaction magnetic field of a synchronous generator and the rotor excitation magnetic field can both be approximately considered to be distributed according to a sinusoidal law. The spatial phase difference between them depends on the time phase difference between the no-load electromotive force E10 and the armature current I. The armature reaction magnetic field is also related to the load condition. When the generator load is inductive, the armature reaction magnetic field has a demagnetizing effect, causing the generator voltage to decrease; when the load is capacitive, the armature reaction magnetic field has a magnetizing effect, causing the generator output voltage to increase. Load operating characteristics: Mainly refer to external characteristics and adjustment characteristics. The external characteristic is the relationship between the generator terminal voltage U and the load current I when the speed is at the rated value, and the excitation current and load power factor are constant. The adjustment characteristic is the relationship between the excitation current If and the load current I when the speed and terminal voltage are at rated values, and the load power factor is constant.

Weidou Intelligent Technology professionally sells German CDC connectors, CDC switches, CDC relays, CDC controllers, CDC plugs, CDC sensors, CDC resistors, CDC capacitors, CDC buses, CDC modules, CDC cables, CDC power supplies, CDC interfaces, CDC gateways, CDC circuit breakers, CDC original imports from Germany. Welcome customers to inquire and order.