[Yu Yue education] reference materials of power electronics technology of Jiangxi University of science and technology

education
- Power Electronics Technology - Chapter materials, examination materials - Jiangxi University of Technology 【】
Chapter one unit test
1、【 Single topic selection 】 Fixed on time Ton, Change the switching frequency or cycle Ts, Thus changing the conduction ratio D Method of realizing output voltage control , go by the name of
A、 Pulse width modulation PWM
B、 Pulse frequency modulation PFM
C、 Pulse amplitude modulation PAM
D、 Pulse code modulation PCM
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2、【 Single topic selection 】 The core of switching power electronic converter is
A、 Switch circuit
B、 Input output filter
C、 Closed loop control circuit
D、 Drive circuit
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3、【 Multiple choice 】 High frequency switch PWM Compared with phase controlled rectifier , More excellent technical characteristics can be obtained
A、 Increase the frequency of harmonic voltage in the output voltage , Reduce filter weight 、 Volume
B、 Increase output power , Reduce system losses
C、 Improve AC input current waveform , Increase the frequency of harmonic current in AC current
D、 Reduce harmonic current frequency in AC power supply , Increase the power factor
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4、【 Multiple choice 】 The analysis of the working characteristics of switching power electronic converter is cumbersome , Usually used Analyze its working characteristics .
A、 State space averaging
B、 Differential equations
C、 Fourier series
D、 Laplace transform
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5、【 Multiple choice 】 What are the types of switch type power electronic compensation controllers ？
A、 voltage 、 Current compensation controller
B、 Impedance compensation controller
C、 Frequency compensation controller
D、 DC compensation controller
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6、【 Multiple choice 】 Which of the following can be applied to switching power electronic conversion power supply
A、 DC long distance transmission
B、 Direct / AC motor variable speed drive control
C、UPS
D、 Battery charging power supply
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Chapter 2 unit test
1、【 Single topic selection 】 On state current of thyristor （ Rated current ） It's electric To represent the .
A、 Valid values
B、 Maximum
C、 Average
D、 Instantaneous value
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2、【 Single topic selection 】 comparison , The fastest switching speed of the following semiconductor devices is
A、IGBT
B、MOSFET
C、GTR
D、GTO
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3、【 Single topic selection 】 When the thyristor is triggered to turn on under the action of trigger current , As long as the current in the thyristor reaches a certain critical value , The trigger current can be removed , At this time, the thyristor still automatically maintains the on state , This critical current value is called
A、 Hold the current
B、 Sustain current
C、 Minimum current
D、 Maximum current
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4、【 Multiple choice 】 In the following devices ： The fully controlled devices are
A、IGBT
B、MOSFET
C、 Thyristor
D、GTO
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5、【 Multiple choice 】 The following about IGBT And electricity MOSFET The right thing to say is
A、IGBT Switching speed is higher than power MOSFET
B、IGBT It is a voltage driven device
C、 Electric power MOSFET There is a secondary breakdown problem
D、IGBT It has a holding effect
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6、【 Multiple choice 】 What is the effect of increasing the switching frequency on the converter ？
A、 The increase of switching frequency will speed up the dynamic response of the system
B、 The volume of power electronic devices will be reduced , Contribute to the miniaturization of power electronic devices
C、 The output ripple of the converter will be reduced
D、 The switching loss of switching devices is reduced
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Chapter 4 unit test
1、【 Single topic selection 】 In voltage type single-phase half bridge inverter circuit , The voltage and current waveforms of resistive load output and inductive load output are _____.
A、 square wave , square wave , Triangle wave , Triangle wave
B、 square wave , Triangle wave , square wave , Triangle wave
C、 square wave , square wave , square wave , Triangle wave
D、 square wave , square wave , square wave , square wave
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2、【 Single topic selection 】 If the DC voltage of the inverter circuit is , Then the effective value of the fundamental wave of the output voltage of the voltage type single-phase half bridge inverter circuit and the voltage type single-phase full bridge inverter circuit are ____.
A、0.45Vd ,0.45Vd
B、0.9Vd ,0.45Vd
C、0.9Vd ,0.9Vd
D、0.45Vd ,0.9Vd
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3、【 Single topic selection 】 The fundamental voltage frequency output by sinusoidal pulse width modulation method is consistent with ____ Corresponding , The amplitude of the output fundamental voltage is the same as _____ Corresponding .
A、 Modulated wave frequency , Modulation ratio
B、 Carrier frequency , Modulation ratio
C、 Modulated wave frequency , Amplitude of modulated wave voltage
D、 Carrier frequency , Amplitude of modulated wave voltage
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4、【 Single topic selection 】 In the following circuits , The circuits that can realize active inverter are _____.
A、 Three phase half controlled rectifier bridge circuit
B、 Three phase half wave controllable rectifier circuit
C、 Single phase fully controlled bridge connected with continuous current diode circuit
D、 Single phase half controlled bridge rectifier circuit
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5、【 Single topic selection 】 Which of the following is a necessary condition to realize active inverter ______.
A、 There is DC electromotive force , And the polarity is consistent with the conduction direction of the thyristor
B、 The DC electromotive force value should be greater than the average voltage on the DC side of the converter
C、 The thyristor control angle must be greater than , Make the average output voltage negative
D、 All of these are
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6、【 Single topic selection 】 Which of the following is not a converter function ______.
A、 Active inverter
B、 rectification
C、 Transformer voltage regulation
D、 DC chopper
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Chapter 6 unit test
1、【 Single topic selection 】 When the single-phase AC controller has a resistive inductive load , The control angle of the thyristor has an effective range , When the single-phase AC controller has pure inductance , Which of the following trigger angles can control the output voltage .
A、45°
B、60°
C、90°
D、120°
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2、【 Single topic selection 】 The harmonic component of load voltage of single-phase AC voltage controller generally includes ：
A、 except 3 And its multiple odd harmonics
B、 Various possible harmonics
C、 Odd number
D、 except 3 And all harmonics of multiple order
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3、【 Single topic selection 】 The phase shift range of three-phase three wire star connected AC voltage controller with resistive load is
A、0~90°
B、0~120°
C、0~150°
D、0~180°
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