Single-phase half-controlled rectify circuit-
In a single-phase half-controlled rectify circuit, the electrical angle at which the crystallizer is in the on-state during a power cycle is called the conducting angle. The electrical angle from the moment the thyratron starts to bear the positive voltage until the trigger pulse is applied is called the trigger delay angle (trigger angle or control angle). By changing the trigger time, the voltage and current waves of the rectified voltage can be changed accordingly, and the output voltage of the direct current is a pulsating direct current with the same pole but the instantaneous value changes. Read more exciting novels for free
Single-phase full-bridge rectify circuit
1. ** Circuit composition and number of Diode ** - The single-phase full-bridge rectify circuit was composed of a group of rectify circuits made up of four rectify nodes. 2. ** Working Principle ** - In the positive half cycle of the AC voltage u2 (0 <><Pi), at both ends of the secondary winding, the A end is positive, and the B end is negative. At this time, there are two of the two reactors (assumed to be D1 and D2) that are turned on by the forward voltage. The current flows from the A end of the secondary winding through D1, the load resistance Ri, and D2 back to the B end of the winding to form a conducting circuit. The other two reactors (D3 and D4) are cut off due to the reverse voltage. - In the negative half cycle of u2 (Pi <> t<2 Pi), the A end of the transformer is negative, and the B end is positive. D3 and D4 are turned on by the positive voltage. The current flows from the B end of the secondary winding, through D3, Ri, D4, and back to the A end of the winding, forming a conducting circuit. At this time, D1 and D2 are cut off due to the reverse voltage. In this way, in the whole cycle, two and two of the four switches are switched on and off in turn, so that there is a current flowing through the load resistance Ri and the direction is always unchanged (from the upper end of the load to the lower end). The secondary winding of the transformer has a current flowing through in the positive and negative half cycles of the whole cycle, which improves the utilization rate of the transformer. 3. ** Calculation of the direct current voltage and current on the load ** - Assuming that the voltage at the secondary side of the transformer u2 ="2U2sin (" t "), the average value of the voltage on the load after being rectified, UA = 2" 2U2/Pi "<anno data-annotation-id =" 222500a-477a-4444a-476a-47777778888a "> 0.9U2 </anno>, and the average value of the current on the load, I = 0.9U2/Ri </anno>. 4. ** Calculation of Rectifying Element's parameters ** - ** Average Current of Diode **: In a single-phase full-bridge rectify circuit, the pair of the Diode is turned on in turn, so the average current flowing through each of the Diode is ID = IL2 = 0.45U2/Ri. - ** Maximum reverse voltage **: The maximum reverse voltage that the circuit can withstand is UMV = 2U2. In the positive half cycle of u2, when the on-side is turned on, the maximum reverse voltage that the off-side is subjected to is the maximum value of u2; in the negative half cycle of u2, the situation is the same. 5. ** Circuit Failure Condition ** - If one of them was connected in the opposite direction, it would short-circuit the load and burn the other one. For example, if D3 was connected in the opposite direction, D1 and D3 would be burned, and if D2 was connected in the opposite direction, D2 and D4 would be burned. - If one of them short-circuited, it would short-circuit the load and burn out the corresponding other one. For example, D1 short-circuited would burn out D3, and D2 short-circuited would burn out D4. - If one of them was cut off, it would become a half-wave rectify, and the output voltage of the circuit would drop. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The composition of the basic components of the single-phase half-wave controllable rectify circuit
The single-phase half-wave controllable rectify circuit was composed of a controllable silicon (SCR), a LED, an ac power supply, and a load (rt). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the principle of the single-phase half-wave controllable rectify circuit simulation experiment?
The single-phase half-wave controllable rectify circuit was mainly composed of a transformer, a crystal-controlled reactor, and a load resistance. When conducting simulation experiments, the principle was as follows: 1. * * Analysis of the switching state of the thyratron ** - In the positive half-wave of the power supply voltage (0-Pi interval), the thyratron bears the forward voltage, but before the pulse u_G triggers the thyratron at the control angle, the thyratron is turned off. At this time, there is no current flowing in the load r, the output voltage u_d is 0, and the voltage the thyratron bears is the power supply voltage u_{ZT}= u2. - When the thyratron is triggered at <<Omega>=<Alpha>>, the thyratron will start to conduct, forming a load current <i_d>>. There is an output voltage and current on the load. At this time, if the tube voltage drop is ignored, the voltage across the load is the secondary voltage of the transformer <u_2>>, and the wave form of the load current <i_L>> is similar to the wave form of <u_L>>. - At the moment of <<Omega>>, the power supply voltage naturally crosses zero, and the cascaded current is turned off when it is less than the sustaining current. The load current is zero. - In the negative half-wave of the power supply voltage (in the range of <Pi>-2<Pi>), the thyristors are in the off-state due to the reverse voltage. There is no output voltage on the load, and the load current is zero. 2. * * Effect of control angle and conducting angle on output ** - The electrical angle from the moment the controllable silicon begins to withstand the forward voltage to the time when the trigger is turned on is called the control angle. The electrical angle of the controllable silicon in a cycle is called the conducting angle. In a single-phase half-wave rectify circuit, the smaller the control angle, the larger the conducting angle, and the larger the average value of the load voltage and current. By changing the size of the control angle, the output voltage can be changed to achieve the purpose of voltage regulation. 3. * * Piecewise-linear Circuit Analysis ** - Using the switching characteristic of the thyratron, the non-linear circuit was transformed into a piecewise-linear circuit. In different intervals (such as the turn-off and turn-on stages of the thyratron), the circuit presented different linear characteristics, so the existing circuit theory could be used to analyze each stage separately. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the maximum forward voltage of a single-phase controllable rectify circuit?
In the single-phase bridge half-controlled rectify circuit, the maximum positive and reverse voltage that the controllable silicon and the LED bear is "2U2"(U2 is the peak power supply voltage). The maximum forward voltage that a crystallizer can withstand is determined by the characteristics of the device itself, which is generally between several hundred volts and several thousand volts. In a single-phase full-wave controllable rectify circuit, as a current tube, the forward voltage that a crystallizer can withstand should be equal to the load voltage, which is generally between several tens of volts and several hundred volts. If the load voltage exceeds the endurance range of the cascaded cascaded Among them, the crystallizer can usually withstand a maximum forward voltage of 1000 volts, so the maximum forward voltage of the single-phase controllable rectify circuit needs to be determined according to the specific circuit conditions, generally between tens of volts and 1000 volts. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Single-phase AC electric meter circuit diagram
When the single-phase AC electric meter works, when the electric meter is connected to the circuit to be tested, the voltage of the circuit to be tested is added to the voltage coil. After the current of the circuit to be tested passes through the current coil, it will produce two alternating magnetic flux passing through the aluminum disk. These two magnetic flux are the same in time, and they will produce vortex currents on the aluminum disk. Due to the interaction between the magnetic flux and the vortex, a rotating moment was generated, causing the aluminum disk to rotate. The magnetic flux of the brake magnet also passes through the aluminum disk. When the aluminum disk is rotated, the magnetic flux is cut, and a current is induced on the aluminum disk. The interaction between the current and the magnetic flux of the brake magnet produces a brake moment opposite to the rotation direction of the aluminum disk, so that the rotation speed of the aluminum disk is uniform. Its main structure included a voltage coil, a current coil, a rotating disc (aluminum disc), a rotating shaft, a brake magnet, a gear, a meter, etc. These components worked together to achieve the power measurement function, but there was no detailed illustration of the single-phase AC electric meter circuit diagram. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Can three-phase four-wire connect to 220V single-phase circuit? How to connect?
In the three-phase four-wire distribution network, 220V single-phase circuit can be connected. The connection method was to connect a wire from any of the three phases and four wires, and then connect a wire from the neutral line, so that the voltage between the two was 220 volts, thus forming a 220V single-phase circuit. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Which is better, a one-way circuit or a three-phase circuit
One-way circuits and three-phase circuits had their own characteristics and were suitable for different scenarios. It was not easy to determine which one was better. From the perspective of transmission cost and non-metallic consumption, under the same transmission power, distance, voltage, and line loss, three-phase transmission lines can save a lot of transmission costs and non-metallic metals. The amount of copper used is about 3/4 of that of single-phase transmission lines. In terms of generators, three-phase alternators were smaller, lighter, and cheaper than single-phase alternators of the same capacity. A three-phase transformer was not only more economical than a single-phase transformer, but it also had two types of output voltage. It could be connected to either a three-phase load or a single-phase load. For the motor, the three-phase motor was simpler in structure than the single-phase motor of the same capacity. It was reliable, cheap, had good performance, stable operation, and high efficiency. Three-phase power sources were easier to generate rotating magnetic fields and were suitable for powering three-phase electric machines, while single-phase circuits were relatively inferior in this regard. However, in daily life scenarios, such as household electricity, a single-phase circuit could meet the electricity needs of electric appliances such as lights, computers, electric kettles, fridges, and 1P air conditioning. Because the power of these appliances was relatively small, 220V single-phase alternating current could be used. In the industry, due to the large power of the equipment, the need for a stable rotating magnetic field, and for economic considerations, most of them used three-phase electricity. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The difference between one-way circuit and three-phase circuit
A one-way circuit had only one line and one neutral line. The current flowed from the line to the neutral line. For example, many electrical appliances in our home use a one-way circuit, such as lights and televisions. It is relatively simple, and the voltage is usually 220V. In a three-phase circuit, there were three live wires and sometimes a neutral wire. The voltage between the three wires was 380V. This kind of circuit was commonly used in the industry. For example, some large-scale electric machines used three-phase circuits. The three-phase circuit could provide more power than the one-way circuit, and it was more efficient. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Single-phase fee-controlled intelligent electric meter for residential area renovation
The single-phase smart electricity meter had many advantages in the community reconstruction. It was convenient for the owner to pay the electricity bill. The owner could pay directly through his mobile phone. The use of this kind of electricity meter made the owner's electricity consumption more transparent. They no longer had to be limited by the property's electricity price, nor did they have to look at the property's face, although the property might still announce the community's public electricity consumption pool. During the installation of the electricity meter, the original electricity meter needs to be removed and the original reading needs to be recorded in the property/power supply unit. After the installation of the new meter, it would start counting. Before the power supply bureau issued the code to the owner, the counting would not be charged. After the power supply bureau issued the code, the owner needed to pay the electricity bill online in advance. However, there were also some problems with this type of electric meter. For example, the pre-stored amount could not be seen on the electric meter, and the remaining amount of electricity would not be displayed. The number displayed on the button in the lower right corner was not very useful to the owner. In the reading of the electric meter, the three numbers "Current Total-Last January Total-Last February Total" were more useful."Current Total" was the total of the current electric meter,"Last January Total" was the total of the electricity consumption until the last time in a natural month, and "Last February Total" was the total of the electricity consumption until the last time in the previous month in a natural month. The electricity consumption of the current month or last month could be obtained by deducting these three numbers. In the table, the concept of peak and valley was total for the month = peak of the month + average of the month + valley of the month. However, the residential electricity was priced according to the "flat" price. If the owner wants to know the electricity situation and balance of his home, he can check it after registering the information in the "Palm Power", or check the current balance and the amount owed through the payment interface of the city service (just remember the payment account number). <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the symbol of the phase shifter in the digital circuit?
In digital circuits, the phase shifter is usually represented by a small circle (or a wavy line). The standard symbol shape is a triangle pointing to the right with a circle at the end.(This circle is called the "Reverse Bubble"), which represents the function of reversing the input signal, and is used to represent the NOT function in its output. This representation is also used in the NAC and Nor symbols to represent the logical operation NOT function, and this bubble representing signal reversal (complementation) can appear on one or both of the output and/or input ends. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>