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controlled Silicon, also known as Silicon Controlled Rectifier (SCR), is an important semiconductor device, which is widely used in power electronics, motor control, lighting regulation and other fields. Its main function is to control the passage of current, thus realizing the regulation and control of the circuit. controlled The working principle and control mode of silicon are the key to understand its application and performance. controlled Structure and basic principle of silicon controlled Silicon has a three-layer semiconductor structure, which is P-N-P-N four layer structure, and has three electrodes: anode, cathode, and gate. When anode
Date: 7 hours ago Reading: 824
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1. Overview of system requirements high pressure controlled The shunt reactor can change the magnetic flux density of the core of the reactor winding by adjusting the excitation current of its control winding, so as to achieve the purpose of changing the reactor capacity, and can flexibly adapt to the changes in the system operation mode. in the light of controlled Due to the characteristics of reactor, it is necessary to configure backup protection such as proportional differential protection, control winding differential protection, interturn protection and overcurrent protection. 2. Recommended technical scheme For 500kV and above controlled For the protection function requirements of the reactor, the recommended technical scheme is shown in Figure 2-1: Using two sets of RCS-917C controlled Duplication of main and backup protection of reactor; Configure a set of RCS-974FG to realize
Date: December 19, 2012 Reading: 1944
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1 Introduction In the information age, BP has become a commonly used communication tool. At present, the transmitting equipment of China's BP general station is all imported equipment, with an output voltage of 13.8V and a current of 15-20A. Imported power supply without controlled Silicon part, and the power grid in China fluctuates greatly, so this low-cost regulated power supply is designed. This design is based on the series feedback regulated regulated power supply controlled Silicon phase control device, which is controlled by adjusting the pressure drop at both ends of the tube controlled The conduction angle triggered by silicon keeps the voltage drop of the regulator unchanged, so a tracking high-power DC stabilized power supply is designed. The regulated power supply limits the power consumption of the regulator and realizes high power. The regulated power supply is mainly controlled by single-phase half control
Date: September 8, 2012 Reading: 1424
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Photoelectric isolation output switch circuit
Date: July 26, 2012 Reading: 1432
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capability controlled DC and DC optoelectronic isolation circuit for input isolation of silicon converter
Date: July 23, 2012 Reading: 1193
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On the basis of Figure 1, connect a control level to one input of NAND gate F1 to form controlled Oscillator, as shown in Figure 2. In the figure controlled When the control level is "1", the oscillator operates and outputs rectangular wave; When the control level is "0", the oscillator stops oscillation, and the output stays at the low level, that is, no oscillation signal is output. Figure 1
Date: July 23, 2012 Reading: 1268
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explain This project is used to control the power supply for disco lighting, although there are many others that may be used to control the use of almost any power equipment. Up to 3 amps per channel, it will control 5 independent channels. This may be due to another PCB design with a wider range of tracks than PCB, and this design includes additions. I can use relays to control my lights, but controlled Silicon seems to be a more sensible solution, because they react quickly and are completely silent, because they do not contain any mechanical parts. The low-voltage control terminal and power supply terminal are completely isolated, and the optical coupler is used for fire protection controlled Silicon. I don't have any schematic diagram. This project is very simple
Date: July 20, 2012 Reading: 1298
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This is a controlled Silicon timer circuit. Here, SCR is used to drive the final actuator, the buzzer. The time constant of the circuit is determined by R1 and C1. When C1 is charged to the required level, the buzzer will make a sound, which will lead to the first quarter and trigger SCR 1. Using the RC constant of FET Q1, a very high and long time delay can be obtained, which makes the circuit have a very wide range of time settings. The following is the circuit schematic diagram:
Date: July 11, 2012 Reading: 1308
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Can build a very simple and practical controlled The circuit diagram of the silicon tester uses few external general electrical components. This circuit schematic uses only a few resistors and a simple red LED. test controlled Silicon will be connected to K, A, G terminals (cathode, anode and grid). Press S1 switch and the current will be transferred to the test controlled Silicon will trigger. If the SCR is good, the LED will light up, and once the S1 door is triggered, it will remain lit, indicating that the device is running. Press S2 switch to turn off the LED and keep it in this state. Using this circuit principle, you can test other components, such as LED, thyristor
Date: July 2, 2012 Reading: 1256
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Composed of thyristors controlled Rectification circuit can change AC into DC with adjustable voltage to reach the output voltage of DC power supply controlled The purpose of. Here are some typical single-phase controlled Rectification circuit. 1. Single phase half wave controlled The single-phase half wave rectifier circuit is formed by replacing the diode in the single-phase half wave rectifier circuit with thyristor in the current circuit controlled Rectification circuit, circuit diagram and waveform diagram. In the positive half cycle of u2, the thyristor bears the forward voltage, but during the period of O~ω t1, the control pole is not connected because no trigger pulse is added, and the load RL has no current flow, and the voltage at both ends is u= O， Thyristors bear all voltages of u2. At the moment ω t1=a, the trigger pulse is added to the thyristor
Date: May 11, 2012 Reading: 1218
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According to the principle of P-N junction, just use a multimeter to measure the resistance between the three poles. The forward and reverse resistance between anode and cathode is more than hundreds of kiloohms, and the forward and reverse resistance between anode and control electrode is more than hundreds of kiloohms (there are two P-N junctions between them in opposite directions, so the forward and reverse resistance of anode and control electrode are not connected). There is a P-N junction between the control electrode and the cathode, so its forward resistance is in the range of several ohm to several hundred ohm, and the reverse resistance is greater than the forward resistance. However, the characteristics of the control electrode diode are not ideal. The reverse direction is not completely blocked, and a relatively large current can pass through. Therefore, it is sometimes measured that the control electrode is reverse
Date: March 5, 2012 Reading: 728
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The basic principle block diagram of thyristor AC power regulator is shown in Figure 1. Figure 1 Basic principle block diagram of thyristor AC power regulator. In the figure, the dotted line part is the power regulator. The main circuit of power regulator is composed of fast fuse FU, reverse parallel thyristor VT, current transformer TA, etc. The zero pulse circuit (1), the continuity ratio circuit (2), the over-current cut-off circuit (3), the AND gate circuit (4) and the pulse transformer (5) constitute the thyristor control circuit. Electric furnace load RL, temperature sensor BST and PID regulator form closed-loop control through external control switch S and power regulator, which can automatically adjust circuit temperature. The AND gate circuit (4) receives three signals. First, the circuit (1) sends
Date: October 20, 2008 Reading: 1738
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1、 What is one-way controlled Silicon (thyristor) -: unidirectional controlled Silicon is a controlled Rectification electronic components can change from off to on under the action of external control signals, but once on, external signals cannot turn them off, and they can only be turned off by removing the load or reducing the voltage at both ends. one-way controlled Silicon is a four layer three terminal semiconductor device composed of three PN junctions PNPN. Compared with a diode with one PN junction, silicon is unidirectional controlled The silicon positive conductor is controlled by the control electrode current; Compared with the triode with two PN junctions, the difference is controlled Silicon has no amplification effect on control electrode current. One way down controlled Structure diagram and circuit symbol of silicon (thyristor)
Date: October 20, 2008 Reading: 1753
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The light controlled thyristor, also known as GK type light switch, is a kind of photosensitive device. 1. What is light controlled thyristor（ controlled The structure of silicon) _ light controlled thyristor usually has three electrodes: control electrode G, anode A and cathode C. Since the control signal of the light controlled thyristor comes from the illumination of light, it is unnecessary to lead out the control electrode, so there are only two electrodes (anode A and cathode C). But its structure is similar to that of ordinary controlled Like silicon, it is composed of four PNPN devices. The shape of the light controlled thyristor is shown in Figure 1 (a). The circuit graphic symbol is shown in Figure 1 (b). From the appearance, the light controlled thyristor also has a light receiving window, as well as two pins and a shell, which looks like a photoelectric device
Date: October 20, 2008 Reading: 1482
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controlled In practical application, the most common circuit pattern of silicon is its gate trigger circuit, which can be summarized as DC trigger circuit, AC trigger circuit, phase trigger circuit, etc. controlled Example of silicon application circuit 1 controlled Silicon application circuit_dc controlled Silicon trigger circuit: as shown in Figure G2, it is a common overvoltage protection circuit for TV sets. When the E+voltage is too high, the voltage at point A will also become higher. When it is higher than the voltage stabilizing value of the voltage stabilizing tube DZ, the DZ channel will be connected, controlled When silicon D is triggered, the channel will short circuit E+, making fuse RJ blow, thus playing the role of overvoltage protection. two controlled Silicon application circuit_phase controlled Silicon trigger circuit: The phase trigger circuit is actually a kind of AC trigger circuit, as shown in the figure
Date: October 20, 2008 Reading: 1636
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1、 One way controlled Structural principle of silicon (thyristor): unidirectional controlled Silicon is a controlled Rectification electronic components can change from off to on under the action of external control signals, but once on, external signals cannot turn them off. They can only be turned off by removing the load or reducing the voltage at both ends. one-way controlled Silicon is a four layer three terminal semiconductor device composed of three PN junctions PNPN. Compared with a diode with one PN junction, silicon is unidirectional controlled The silicon positive conductor is controlled by the control electrode current; Compared with the triode with two PN junctions, the difference is controlled Silicon has no amplification effect on control electrode current. one-way controlled Silicon structure and circuit symbol diagram II. Bidirectional controlled Silicon (thyristor) structure principle
Date: October 20, 2008 Reading: 1767
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one controlled The schematic block diagram of silicon (thyristor) AC voltage regulating circuit is shown in Figure 1. Figure 1 Communication controlled Principle block diagram of silicon voltage regulating circuit (1) The rectifier circuit uses bridge rectification to change 220 V, 50 Hz AC voltage into pulsating DC. (2) The anti-interference circuit is a common power anti-interference circuit. （3） controlled Silicon control circuit adopts controlled Silicon and step-down resistor. (4) The relaxation oscillator consists of a single junction transistor and a resistor. (5) The impulse discharge circuit is composed of resistance, variable resistance and capacitance. 2． controlled Schematic diagram of silicon (thyristor) AC voltage regulating circuit Figure 2 AC controlled Schematic diagram of silicon voltage regulating circuit 3. Can
Date: October 20, 2008 Reading: 3173
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Summary: In order to understand two-way controlled The internal circuit and working principle of silicon are mainly based on the easy to understand triode, which is bidirectional controlled The distribution of P type semiconductor and N type semiconductor in silicon, and a circuit that can be triggered and conducted in both directions is designed. It is also discussed theoretically and verified through actual circuit production, which can achieve two-way in practical application controlled Silicon has the same effect. 0 Introduction Two way controlled Silicon (TRIAC) is widely used in the field of controlling AC power supply. For example, our fluorescent lamp dimming circuit and AC motor speed control circuit mainly use two-way controlled Silicon can trigger the conduction in both directions to control the AC power supply
Date: May 15, 2010 Reading: 1780
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With the rapid development of computer control technology, programmable logic controller (PLC) with microprocessor as the core has gradually replaced relay control, and has been widely used in the field of automation control in various industries. The coal industry is relying on modern high-tech means to update the existing obsolete electrical control equipment. controlled The development of silicon DC speed regulating system control has experienced two generations of analog control circuits, namely discrete components and integrated operational amplifiers, and finally replaced by PLC digital program control. When the first two are applied in practice, there are generally steady-state errors caused by design problems, dynamic and static responses, changes in the dynamic parameters of electronic components, and errors in the given and feedback actions, which make the system oscillate
Date: January 13, 2009 Reading: 1389
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1 System composition and working principle 1.1 System composition The system consists of five parts: transmitter, PLC host, analog input and output module, touch screen controlled The system control structure is shown in Figure 1. In the control part, S7-200 PLC of SIEMENS is selected to process the sampling signal quickly and reliably, and the programming software is STEP 7-MicroWIN 32 V3.2; Siemens TP270B touch human-machine interface (HMI) is selected to display and record real-time temperature values and various fault information. The configuration software is SIMATIC Pro Tool
Date: January 12, 2010 Reading: 1334
