Description
1. Analog signal acquisition: analog digital acquisition board converts analog signals to digital signals through the built-in analog-to-digital converter (ADC). It can receive analog signals from sensors, instruments and external signal sources, such as voltage, current, temperature, pressure, etc. The acquisition board has high speed and high precision sampling performance, and can continuously measure and collect analog signals in a certain range. 2. Digital signal output: After the analog signal conversion is completed, the analog digital acquisition board will transmit the converted digital signal to the computer or control system for further processing, analysis and storage. The digital signal output can be in the form of pulse code modulation (PCM), or other common digital signal formats. 3. Multi-channel and multi-function: analog digital acquisition board usually has a multi-channel input function, which can collect multiple analog signal sources at the same time. In addition, they usually have other functions, such as voltage amplification, filtering, sampling rate selection, etc., to meet the needs of different application scenarios. 4. Communication interface: Analog digital acquisition board usually provides a variety of communication interfaces, including PCI, PCIe, USB and Ethernet, in order to connect with the computer or control system. These interfaces provide convenient data transmission and control, making the integration of the acquisition board with other devices more flexible and convenient. 5. Application: analog digital acquisition board is widely used in various fields, such as scientific research, industrial automation, data acquisition, instrumentation and so on. They can be used for various types of sensor measurements and instrument monitoring, such as temperature measurement, pressure monitoring, vibration analysis, etc. When selecting the appropriate analog and digital acquisition board, the following factors need to be considered: sampling rate, resolution, number of input channels, power supply mode, communication interface and software support. These factors will vary depending on the specific application needs.
Silicon Controlled Rectifier (SCR) is a high-power electrical component, also known as a thyristor. It has the advantages of small size, high efficiency and long life. In the automatic control system, it can be used as a high-power driving device to realize the control of high-power equipment with low-power control. It has been widely used in AC and DC motor speed control system, power regulation system and servo system. Thyristors are divided into two kinds: unidirectional thyristors and bidirectional thyristors. Bidirectional thyristor is also called TRIAC, or TRIAC for short. The bidirectional thyristor is structurally equivalent to two unidirectional thyristors in reverse connection, and this thyristor has a dual pilot pass function. Its on-off state is determined by the control pole G. Adding a positive pulse (or negative pulse) to the control pole G can make it forward (or reverse) conduction. The advantage of this device is that the control circuit is simple and there is no reverse voltage problem, so it is particularly suitable for AC contactless switch use. P1N1P2N2 four-layer three-terminal device with silicon single crystal as the basic material began in 1957, because its characteristics are similar to vacuum thyristor, so it is known internationally as silicon thyristor, referred to as thyristor T, and because the thyristor was originally in static rectification, it is also known as silicon controllable rectifier element, referred to as thyristor SCR. In terms of performance, thyristor not only has unidirectional conductivity, but also has more valuable controllability than silicon rectifier elements (commonly known as "dead silicon "). It only has two states: on and off. SCR can control high-power electromechanical equipment with milliampere-level current, if the power exceeds this, due to the significant increase in component switching loss, the average current phase allowed to pass is reduced, at this time, the nominal current should be degraded. Thyristor has many advantages, such as: to control high power with small power, power amplification up to hundreds of thousands of times; The response is extremely fast, opening and closing in microseconds; No contact operation, no spark, no noise; High efficiency, low cost and so on. The weakness of thyristor: static and dynamic overload capacity is poor; Easily misled by interference. Thyristor from the appearance of the main classification: bolt shape, flat plate shape and bottom shape. Thyristor characteristics "Hair-trigger". However, if the anode or the control pole is applied with a reverse voltage, the thyristor cannot be switched on. The function of the control pole is to make the thyristor open by applying a forward trigger pulse, but it cannot be turned off. So, what method can be used to make the conducting thyristor shut off? The switched thyristor can be turned off by either disconnecting the anode power supply (switch S in Figure 3) or making the anode current less than the minimum to maintain the conduction (called the maintenance current). If an AC voltage or a fluctuating DC voltage is applied between the anode and cathode of the thyristor, the thyristor will shut itself off when the voltage crosses zero.
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