英语小葵花学前基础练习第136期
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1, this chapter studies the requirements, 4.1 passive inverter circuit principle, requirements to reach the "familiar" level. 1) concept of inverter. 2) the distinction between active and passive inverter. 3) classification of inverter circuits and their characteristics. 4.2 single-phase voltage type inverter circuit, the requirements to reach the "master" level. 1) the circuit structure and working principle of the single-phase half bridge inverter circuit. 2) circuit and working principle of single phase bridge inverter circuit.Eight3) the role of a continuous flow diode in the reverse shunt of the switch tube. 4.3 pulse width modulation (PWM), required to achieve the "familiar" level. 1) the basic principle of sinusoidal pulse width modulation (SPWM). 2) PWM unipolar modulation and bipolar modulation. 2) concept and implication of carrier signal, modulation signal, carrier ratio and modulation ratio. 3) the concept of synchronous modulation.Fifth chapter DC chopper1. The working principle and control mode of the 5.1 direct current chopper are required to reach the level of "Mastery". 5.2 the basic circuit of the DC chopper is required to reach the level of "Mastery".5.2.1 buck chopper, requirements to reach the "master" level.1) circuit of Buck chopper and its working principle. 2) expression of the average value of the output voltage of the buck chopper. 5.2.2 boost chopper, required to reach the "familiar" level.1) circuit components and working principle of the boost chopper. 4) an expression of the average value of the output voltage of the boost chopper. 5.3 compound chopper. 2, this chapter focuses on the basic concepts, the buck chopper, boost chopper circuit circuit diagram, working principle, waveform analysis, basic calculation (T, K, Uo)AC voltage regulation circuit and phase control AC frequency conversion circuit sixth AC voltage regulation circuit and phase controlled AC frequency conversion circuit1, this chapter studies the requirements, 4.1 single-phase AC voltage regulation circuit, the requirement to reach the "familiar" level. 1) the concept of AC voltage regulation circuit. 2) the circuit structure and working principle of single phase AC voltage regulation, and the wave analysis.Control and protection circuit for power electronic converter device with seventh chapters: the control and protection circuit of power electronic converter1, this chapter studies the requirements, 7.1 to grasp the common protection circuit types and protective measuresNine7.2 thyristor gate pole trigger circuit, required to reach the "familiar" level. 1) the basic requirements of the thyristor to trigger circuit. 2) the synchronous signal is the trigger circuit of the saw tooth wave and the driving circuit of the 7.3 kinds of the full control device is known. 1) the basic requirements of GTR for driving circuit.The third partOne, fill in the blankComprehensive exercisesPole. A.1 thyristor is the four layer three terminal device, the three lead electrode are: anode, cathode and2 a rated current is 100A of the ordinary thyristor, which allows the current effective value of3 with the ability to turn off the power electronic devices known as the device.4. The three-phase full controlled bridge rectifier circuit, the common cathode assembling method of three thyristors, asking them to trigger pulse to 120 for the interval, followed in the half cycle of the power supply voltage trigger various crystal thyristor. Time.5 the average value of the output voltage of the rectifier circuit will be6 three-phase full controlled bridge rectifier circuit and the output voltage waveform of the three-phase full controlled bridge in one cycle.7 the average voltage of the two ends of the chopper is changed by the time ratio control, and there are three kinds of modulation methods for the chopper trigger pulse;;... buck chopper, supply voltage Ud=50V guide ration is 0.8, the load average value of voltage for ULD. Current type inverter DC side, the output current waveform for. And modulation.Two according to the polarity of the modulation pulse, PWM also has 10 kinds of modulation methods, respectively is two, 1 of the test shows that the opening and closing conditions. 2 test on the condition of realizing the active inverter in thyristor rectifier device.3 explain in the two phase rectifier circuit voltage rectifier U2 is selected too high or too low, there will be what problem?4 when the single-phase half controlled bridge rectifier circuit with inductive load, if the circuit does not continue to flow diode, please make an analysis of the possible "out of control" phenomenon.5 three-phase bridge full control rectifier circuit with large inductance load, to connect to the A phase of the common cathode group SCR T1 as an example, in a period, the voltage of the situation. 6. A single phase controlled rectification circuit, respectively to resistive load and battery back EMF load power supply, in the flow through the load average current value under the same conditions, what a load of thyristor current rating to be elected some? Why?TenThree, calculate the 1 single phase bridge controlled rectifier circuit, with a large inductance of the battery charge, R = 3, L =, 220V = U2, 60V = E. 1) to maintain the charge current of 10A, estimate the control angle at this time; 2) the circuit of the maximum voltage of the thyristor is how much? 2. Single phase full controlled bridge rectifier circuit, with a sense of the load resistance, r = 5 K, L value greatly, that is, to meet the Omega L>>R, U2 = 100V. When alpha = 60, seeking: 1) made output voltage UD, output current ID, transformer secondary side current I2 waveform; 2) for rectifier output average voltage UD, current ID and secondary side current effective value I2; 3) consider two times the safety margin, thyristor rated voltage and rated current value. 3 single phase full control bridge active inverter circuit, loop resistance R = 1,, Ld, the transformer is large enough, the transformer two times the voltage。
