The shape of the switching transistor circuit is the same as that of a normal transistor. When the switching transistor circuit operates in the cut-off area and the saturation area, it is equivalent to the cut-off and conduction of the circuit. Since the switch transistor circuit has a function of completing the disconnection and connection, it is widely used in various switch circuits including: a switching power supply circuit, a high frequency oscillation circuit, a driving circuit, an analog-to-digital conversion circuit, a pulse circuit, and an output circuit. So how to look at the switching transistor circuit? What are the switching transistor circuit knowledge? Let's learn about it with me!
Switch Triode Circuit - Circuit Graphics
With the continuous improvement of industrial level, the scientific and technological content of all fields is constantly improving. The switching transistor circuit is believed to be familiar to all. The load resistance of the switching transistor circuit is directly connected between the collector of the transistor and the power supply. The input voltage is Effective control of the switching transistor's opening and closing operation, when the switching transistor circuit is in the open state, the load current is blocked, when the switching transistor circuit is closed, the current can flow. That is, when Vin is low voltage, the collector also has no current, so that the load connected to the collector terminal also has no current.
Switch Triode Circuit - Classification
Switch triode circuit how to see? It is believed that most people do not quite understand this issue. The choice of a triode requires understanding of the main parameters of the triode. It is best if you have a transistor feature manual in your hand. Switching transistor circuit has many parameters. The parameters that must be understood during use include: ICM, BVCEO, PCM, fT, TON TOFF, etc. According to the power of the switching transistor circuit, it can be divided into small power switch tube, medium power switch tube, and high power. turning tube. The commonly used low power switch tube has 3AKl-5, 3AKl9-3AK20, 3AKll-15, 3AK20-3AK22, 3CK8, 3DK2-4, 3CKl-4, 3CK7, 3DK7-9. The commonly used high back pressure, high power switch tubes are: 2SD1887, 2JD1556, 2SD1455, 2SD1497, 2SD1553, 2SD1433, 2SD1403, 2SD1431, 2SD850 and so on.
Switch Triode Circuit - Working Principle
When the voltage applied to the transistor junction of the switching transistor circuit is lower than the conduction voltage of the PN junction, that is, when the base current, the collector current, and the emitter current are all zero, the switching transistor circuit loses the current amplification effect, and the value is the collector. Between the emitter and the emitter is equivalent to the open state of the switch. When the voltage applied to the transistor of the switching transistor is greater than the voltage of the PN junction, when the base current increases to a certain extent, the collector current does not increase with the increase of the base current. At this time, the switching transistor circuit loses current. In the amplification, the voltage between the collector and the emitter is very small, and the collector and the emitter are equivalent to the conduction state of the switching transistor circuit.
Switch Triode Circuit - Applications
With the advancement of society and the rapid development of science and technology, modern industry and the realm of life cannot be separated from the use of switched triode circuits. Switch triode circuits have long life, no mechanical wear, safety and reliability, fast switching speed, and small size. Many features. At the same time, the switching transistor circuit can use a very small current to control large currents, and it is widely used in modern daily life. The low-power switch triode circuit can be used for driving circuits, power circuits, switch circuits, etc.; high-power switch triode circuits can be used in many fields such as power supplies for color televisions, communication equipment, low-frequency power amplifier circuits, and current adjustment.
Switch Triode Circuit - Notes
Due to the wide range of use of the switching transistor circuit in our daily life, making the switching transistor circuit safe is also very important. In the circuit design, we must ensure that the switching transistor circuit works in the "saturation / cut-off" state and must not work in the amplification area. Do not The switch triode circuit is deeply supersaturated, which will seriously affect the cut-off switching speed. During the use of the switch triode circuit, it is necessary to pay attention to its reliability. In the base artificially connected to a negative power supply VEE, the speed of the switch triode circuit needs to be adjusted. The input frequency.
Editor's summary: The above is the introduction of switching transistor circuit classification, switching transistor circuit applications, and hope to help meet the needs of friends! For more information, please continue to follow our website. Follow-up will present more exciting content!
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