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1、单相交流调压电路设计(Design of single phase AC voltage regulator circuit )DOCdocuments mayexperience poor browsing on the WAPSide. It is recommendedthat you first select TXT, or download the source file to the local view.Design of single phase AC voltage regulating circuit, design of single-phase AC voltage r
2、egulating circuit, AC voltage regulating circuit1 design objectives and requirements analysisThe design of a single-phase AC voltage regulator circuit requires a trigger angle of 45 degrees. The back EMF load is E=40 volts and the input is AC U2=210 volts. There are no LB and LB two of.L is large en
3、ough, C analysis of large enough requirements: 1. single-phase AC voltage design, main circuit principle; 2. trigger circuit design, analysis of sequence and phase of each switch trigger; 3. protection circuit, overcurrent protection, overvoltage protection principle and setting analysis; the calcul
4、ation of 4. parameters (including the trigger angle, average output voltage, average output current, output active power calculation, output waveform analysis, determine the rated parameters of the device can add their own analysis parameters); from the above design requirements of the system can be
5、 divided into four parts: the AC voltage main circuit, trigger circuit design protection circuit design and related calculation and waveform analysis part. Here are a detailed introduction.2 the design selection adopts two common thyristor reverse parallel design single-phase AC voltage regulating c
6、ircuit 3 single-phase AC voltage regulation main circuit design and analysisAC voltage regulation means that the two thyristors are connected in series in an AC circuit after they are connected in parallel. In each half cycle, the effective value of the output voltage can be adjusted conveniently by
7、 controlling the phase of the thyristor. ACvoltage regulating circuit is widely used in light control and asynchronous motor soft start, also used in asynchronous motor speed regulation. In addition, in the high voltage, small current or low voltage, high current power supply, AC voltage regulation
8、circuit is often used to adjust the primary voltage of the transformer. The course design is mainly to study the design of single-phase ACvoltage regulation circuit.Because the working condition of ACvoltageregulating circuit is closely related to the nature of the load, the anti EMF and resistance
9、load are discussed below.OneFigure 1 and Figure 2 are respectively the back EMF, the resistance load, the single-phase AC voltage regulation circuit and the waveform. The thyristors VT1 and VT2 in the picture can also be replaced by a bidirectional thyristor. The output voltage can be adjusted by co
10、ntrolling the phase shift control angle of the VT1 and VT2 in the positive half and half half cycles of the AC power U2.Fig. 1 single phase ACvoltage regulation circuit with back EMFresistance loadFig. 2 waveform of input and output voltage and currentThe positive and negative half cycle alpha start
11、 times (alpha =0) are voltage zero crossing times. At t = Alpha Omega, applying trigger pulse to VT1, whenVT1 positive bias is turned on, the load voltage waveform and power supply voltage waveform in the same; omega = Pi T, power supply voltage zero, due to a resistive load, current is zero, VT1 tu
12、rned off. stayWhen Omega t = Pi + alpha, a trigger pulse is applied to theVT2, and the waveform of the load voltage is shifted when theVT2 is biased forwardThe sameas the supply voltage waveform; at Omegst = 2 pi, the power supply voltage is zero, and the VT2 is turned off naturally. Whenthe power s
13、upply voltage reverse zero, because of the back EMF load prevents current changes, so the current can not be immediately to zero, the thyristor conduction angle size, not only related to the control angle, but also related with the load impedance angle. The initial control points of gate gates of tw
14、o thyristors are set at the starting point of each half of the supply voltage respectively. When the steady-state is equal to the positive and negative half weeks, the load voltage waveform is part of the supply voltage waveform, and the waveform of the load current (the supply current) is similar t
15、o that of the load voltage.4 trigger circuit designTwoThe thyristor trigger circuit is used to generate gate trigger pulses that meet the requirements and to ensure that the thyristor is switched off to conduction at the desired time. Broadly speaking, thyristor trigger circuit often includes a phas
16、e control circuit of the trigger time of the control, but here refers to pulse amplification and output. The thyristor trigger circuit shall meet the following requirements: 1) the width of pulse should ensure reliable thyristor conduction of the converter, back EMF load should be used in pulse width or pulse trigger; 2) trigger sufficient amplitude, on cold outdoor occasions, amplitude of pulse current should be increased to 3-5 times the maximum trigger
