The revelation of nature 1 Nature has given mankind many Revelations, it is the earliest "teacher" of mankind. Through theHistory gives us many good examples. Because of the illumination of fireflies, scientists invented fluorescent lamp igt wireless charging ; Inspired by the horse running on the prairie, scientists invented the automobile. And because the small turtle can rotate 360 degrees on the back of the big turtle, scientists invented the rotating tank... Recently I have discovered some of nature's secrets. On Saturday, I was doing my homework at home. After finishing my homework, I saw my mother sell back some loquat, the loquat is yellow, big and fresh,It makes my mouth water. I washed my hands at once, sat down in front of the loquats, and devoured them. Nature is a wonderful world, with many amazing mysteries.
This connection between the thyristor and the power supply is called a forward connection, that is, the positive voltage is applied to the anode and control pole of the thyristor. Now we close the power switch S, the small light bulb does not light, indicating that the thyristor is notTo conduct; Press the button switch SB again, input a trigger voltage to the control pole, and the small lamp lights up, indicating that the thyristor is conducting.
Thyristor thyristor is short for thyristor rectifier, which is a high-power semiconductor device with a four-layer structure of three PN junctions, generally composed of two thyristors connected in reverse. Its function is not only rectification, but also can be used as a contactless switch to quickly turn on or off the circuit, to achieve the inverter of direct current into alternating current, alternating current of one frequency into alternating current of another frequency, and so on.
Thyristors are divided into unidirectional thyristors and bidirectional thyristorsAll three electrodes. A unidirectional thyristor has a cathode (K), an anode (A) and a control pole (G). Bidirectional thyristors are equivalent to two single thyristors in reverse parallel. That is, one of the unidirectional silicon anode is connected with another cathode, the leading end is called T2 pole, one of the unidirectional silicon cathode is connected with the other anode, the leading end is called T2 pole, and the remaining is the control pole (G).
Reveal the thyristor veil: Semiconductor current controller Thyristor, this seemingly mysterious component, is actually a member of the semiconductor family, it with unique design and function, control the flow path of large current. Be different fromA single function of resistance, thyristor is able to keep the circuit continuously open and works like two transistor partners working closely together.
Thyristor is a P1N1P2N2 four-layer three-terminal structural element, a total of three PN junction, when analyzing the principle, it can be regarded as composed of a PNP tube and an NPN tube. When anode A is applied with a forward voltage, both BG1 and BG2 tubes are amplified. At this time, if a forward trigger signal is input from the control pole G, BG2 will have a base current ib2 flowing through, amplified by BG2, its collector current ic2=β2ib2.
2, the role of thyristor in the health pot circuit is to control current and voltage. The thyristor is divided into three main types from the shape of spiral type, flat type and flat type, and spiral type has more applications. The thyristor has three electrodes - anode (A) cathode (C) and control electrode (G). The tube core is a four-layer structure composed of overlapping P-type conductors and N-type conductors, with a total of three PN junctions.
3, two-wayThyristor: Bidirectional thyristor is a silicon controllable rectifier device, also known as bidirectional thyristor. This device can realize the contactless control of alternating current in the circuit, and control the large current with small current. It has the advantages of no spark, fast action, long life, high reliability and simplified circuit structure.
4, KP5A400V spiral type ordinary unidirectional thyristor. The pin is the cathode (K) anode (A) control pole (the one with the smallest G pin). Application: speed regulation, voltage regulation, rectification, inverter and so on. The speed control method is to use a single junction transistor to generate trigger pulse to control the on-angle of thyristor and control the outputVoltage.
5, at present, thyristor has a wide range of applications in automatic control, mechanical and electrical applications, industrial electrical and home appliances. The thyristor is mainly divided into three types: spiral type, flat type and flat type. Spiral type is used more.
6, TRIAC) phase Angle, when VC3 exceeds the breakdown voltage of DIAC, thyristor will be switched on. When the thyristor current falls below its holding current (Iholding), the thyristor is turned off and must wait until the C3 is recharged in the next half cycle before it can be switched on again. The phase of the voltage and current in the lamp filament with the dimming signalThe position Angle is closely related, and the phase Angle varies between 0 degrees (near 0 degrees) and 180 degrees (depending on the dimmer).