ZOPDDL-2 Circuit Analysis and Power Electronics Technology Experimental Device

I. Overview

The "ZRDDL-2 Circuit Analysis and Power Electronics Technology Experimental Device" is a comprehensive experimental device launched by our company based on the summary of domestic electrical and electronic experimental equipment and the use of mature technology. It is developed based on the requirements of the current experimental syllabus of "Circuit Analysis", "Electrical Fundamentals", "Electrical Engineering", "Power Electronics Technology" and other courses in undergraduate, junior college, technical secondary school and vocational schools in China. It is particularly suitable for the replacement of existing experimental equipment in colleges and universities, and for the construction or expansion of laboratories in technical secondary schools and vocational schools , providing an ideal experimental equipment for the rapid opening of experimental courses.

2. Features

1. Strong comprehensiveness: It integrates all the practical tr*ning contents of basic electrical and electronic courses in various schools in China.

2. Strong adaptability: The depth and breadth of the tr*ning can be flexibly adjusted according to needs. The device adopts a hanging box structure, which is easy to replace. Functions can be expanded or new tr*ning projects can be developed by adding components.

3. The measuring instrument has high precision and adopts digital and intelligent mode, which is in line with the development direction of modern measurement.

4. High safety performance: The 380V AC output on the tr*ning screen is equipped with an overcurrent protection device. If there is a direct short circuit or overload between phases or lines, and the current exceeds the set value, the system will alarm and cut off the m*n power supply to ensure the safety of the equipment.

5. The device has reasonable structure, superior performance, complete supporting facilities and luxurious appearance.

6. Depending on the voltage, the tr*ning connection wires and sockets adopt different structures, which are safe and reliable to use.

3. Technical performance:

1. Working power supply: three-phase four-wire (or three-phase five-wire) ~ 380V ± 5% 50Hz

2. Temperature: -10℃～40℃, relative humidity <85% (25℃)

3. Device capacity: <1.5KVA

4. Weight: 200Kg

5. Overall dimensions: 1700mm×700mm×1600mm

4. Basic configuration and functions of the tr*ning device

This tr*ning platform is m*nly composed of a tr*ning screen, a tr*ning hanging box, a tr*ning table, etc.

1. Power control panel

The tr*ning screen is an iron double-layer matte dense-gr*ned spray-coated structure with an aluminum panel. It provides AC power, DC regulated power, constant current source, function signal generator (including frequency meter), test instrument and tr*ning devices for the tr*ning hanging box. The specific functions are as follows:

1. Provide three-phase 0~450V and single-phase 0~250V continuously adjustable AC power supply. The adjustable AC power output is equipped with overcurrent protection technology, which can automatically protect ag*nst phase-to-phase, line-to-line overcurrent and direct short circuit. It is equipped with a pointer-type AC voltmeter, which can indicate the three-phase grid voltage and the three-phase voltage regulation output voltage respectively by switching the switch.

2. Provide two low voltage DC 0~30V/1A continuously adjustable power supplies, equipped with a digital voltmeter to indicate the output voltage, voltage stability

The current stability is ≤0.3%, and it is equipped with short-circuit soft cut-off protection and automatic recovery function.

3. Provide a 0~200mA continuously adjustable constant current source, divided into 2mA, 20mA, 200mA three gears, starting from 0mA, the adjustment accuracy is 1‰,

Load stability ≤5×10-4, rated change rate ≤5×10-4, equipped with a digital DC milliammeter to indicate output current, with output open circuit and short circuit protection functions.

4. Provide a 220V, 30W fluorescent lamp for laboratory table lighting, and a 220V, 30W fluorescent lamp tube for experiment.

Lead out the four ends of the lamp filament for experimental use.

5. Provide a true effective value AC digital voltmeter with a measurement range of 0 to 500V, automatic range judgment and automatic switching, and an accuracy of 0.5

Level, three and a half digits display.

6-Power Output Function Generator:

1) Direct digital frequency synthesis (DDS) is used to generate high-precision sine waves, square waves and triangle waves. A large-screen LCD is used to display the output frequency, waveform, and attenuation value.

2) Sine wave output amplitude ≥10V, output impedance 50Ω, distortion <1% (0.1HZ-- 1KHz).

3) Frequency range: 0.1HZ~3MHz, use the keyboard to directly input numbers to set the frequency.

4) The output amplitude is adjusted by potentiometer, and the sine wave output has 20db, 40db attenuation.

5) The square wave duty cycle is adjustable, and the adjustment range is 1%-99%; the square wave and triangle wave are output using TTL level.

6) The maximum measuring range of the frequency meter is 100MHz, with automatic shifting.

7. Instruments and controlled source function boards

1. Digital display AC voltage, range 0~500V, 1 unit, with over-range protection, accuracy 0.5

2. Digital display AC ammeter, range 0~5A, 1 unit, with over-range protection, accuracy 0.5

3. Two DC digital voltmeters, measuring range 0~300V, divided into 2V, 20V, 300V three gears, direct key switch, three

1/2 digit digital display, input impedance 10MΩ, accuracy 0.5, with over-range alarm, indication and m*n power cut-off functions.

4. One DC digital milliammeter, measuring range 0~2000mA, divided into 20mA, 200mA, 2000mA three gears, direct key switch

It has three and a half digits display, 0.5 grade accuracy, and has the functions of over-range alarm, indication and cutting off the m*n power supply.

5. One digital display AC millivoltmeter, range 0~500V; accuracy level 0.5, with over-range protection.

8. Smoothing reactor: 100mH, 200mH, 700mH inductors, m*nt*n linearity at 1A.

9. A set of three-phase synchronous transformer

10. Other facilities: Two square st*nless steel pipes can be used to hang experimental components. There are 7-core and 3-core sockets at the bottom of the groove, and the power supply of the pendants is provided by these sockets. Single-phase three-pole 220V power sockets and three-phase four-pole 380V power sockets are set on both sides of the control panel.

DK02 laboratory table: iron double-layer matte dense-gr*ned spray-p*nted structure, the desktop is wear-resistant high-density board; there are two large drawers (with locks) on the left and right, used to place tools and materials respectively.

2. Experimental components

1. ZRDG-03 Circuit Basic Experiment Box

    Provide experiments such as Kirchhoff's law (three typical fault points can be set), superposition principle (three typical fault points can be set), Thevenin's theorem, Norton's theorem, two-port network, reciprocity theorem, R, L, C series resonant circuit, R, C series-parallel frequency selection network and first-order and second-order dynamic circuits. All experimental devices are complete, experimental units are clearly isolated, experimental circuits are complete and clear, and verification experiments are combined with design experiments.

2. ZRDG-04 AC circuit experiment

Provide experiments such as single-phase and three-phase load circuits, fluorescent lamps, transformers, mutual inductors and electric meters. The load is three completely independent lamp groups, which can be connected into two three-phase load circuits of Y or △. Each lamp group is equipped with three parallel incandescent lamp screw sockets (each group is equipped with three switches to control the on and off of the three parallel load branches), and can be plugged with nine incandescent lamps below 60W. Each lamp group is equipped with a current socket for easy current testing; each lamp group is equipped with an overvoltage protection circuit to ensure the safety of experimental students and prevent the lamp group from being damaged due to overvoltage; the fluorescent lamp experimental devices include a 30W ballast, a high-voltage capacitor (0.47µF/500V, 4.7µF/500V), a starter and a short-circuit button; an iron core transformer (50VA, 36V/220V), the primary and secondary sides are equipped with fuses and current sockets for easy current testing; 

3.ZRDG-05 component box

There are three groups of high-voltage capacitors (one each of 1µF/500V, 2.2µF/500V, and 4.7µF/500V high-voltage capacitors) for experiments to change the power factor. Various components required for the experiment are provided, such as resistors, diodes, light-emitting tubes, voltage-stabilizing tubes, potentiometers, and 12V bulbs. A decimal adjustable resistance box is also provided, with a resistance value of 0 to 99999.9Ω/2W.

4. ZRDG-06. Single-phase intelligent power and power factor meter

A dedicated DSP is used to calculate active power and reactive power. The power measurement accuracy is 0.5 level, and the voltage and current ranges are 450V and 5A respectively. It can measure the active power, reactive power, power factor and properties of the load; in addition, it can store and record 15 groups of power and power factor test result data, and can query them group by group.

5.DQ27 three-phase adjustable resistor

Three groups of 900Ω×2/0.41A are used as adjustable resistive loads in the experiment.

6.DK03 thyristor m*n circuit

6 5A/1000V thyristors are provided, each of which is equipped with over-current and over-voltage protection devices. The thyristor can be triggered by an external signal (with a trigger pulse input interface), which can better complete the design experiment; there are one precision pointer DC voltmeter with mirror ±300V, one precision 1.0 grade DC ammeter with mirror ±2A, and one precision 1.0 grade.

7.DK04 three-phase thyristor trigger circuit

Provide three-phase trigger circuit, power amplifier circuit, etc., to be used together with "thyristor m*n circuit".

8.DK05 thyristor trigger circuit experiment

Five trigger circuit experiments are provided, including single junction transistor trigger circuit, sinusoidal wave synchronous phase shift trigger circuit, sawtooth wave synchronous phase shift trigger circuit, single-phase AC voltage regulation trigger circuit, and TCA785 integrated trigger circuit.

9.DK08 given and experimental devices

Provide a given voltage (±15V adjustable voltage output), a varistor (as an overvoltage protection element, internally connected in a triangle), and a diode.

10. DK09 new device characteristics experiment

Provide SCR, MOSFET, IGBT, GTO, GTR power electronic devices, which can be used with other components to measure their characteristic curves.

11.DK11 single-phase voltage regulation and adjustable load

A 0~250V/0.5kVA single-phase AC auto-voltage regulator is provided to provide an adjustable power supply for the corresponding experiments; a rectifier filter circuit and a 0~180Ω/1.3A (series) or 0~45Ω/2.6A (parallel) ceramic disc adjustable resistor are provided to provide an adjustable resistive load for the corresponding experiments.

12.DK12 three-phase core transformer

A three-phase core transformer is provided (the transformer has two sets of secondary windings, and the voltages of the primary and secondary windings are 127V/63.6V/31.8V) for asynchronous motor cascade speed regulation experiments and three-phase bridge and single-phase bridge active inverter circuit experiments; a three-phase uncontrolled rectifier circuit is also provided to generate DC power supply.

13.DK14 single-phase AC-DC frequency conversion principle

This experiment is used to demonstrate the principle of AC/DC/AC frequency conversion. It m*nly allows students to understand the formation method of SPWM sinusoidal pulse width modulation signals, the characteristics and uses of IGBT-specific integrated driver chips, and to complete the following experimental projects: (1) The process of SPWM wave formation; (2) The working conditions and waveforms of AC/DC/AC frequency conversion circuits under different loads (resistive and inductive loads), and the influence of operating frequency on the circuit working waveform; (3) The working characteristics of IGBT-specific integrated driver chips.

14.DK17 DC/DC conversion circuit

The m*n circuit and control circuit of the DC/DC conversion circuit experiment are provided. The power electronic device is IGBT, the control circuit uses PWM control integrated circuit SG3525, and the required observation hole is also provided on the hanging box panel.

15.DK07 DC chopping experiment

Provides components required to form a DC chopper circuit and uses a dedicated PWM control integrated circuit SG3525. Can complete six typical experiments in the textbook: Buck Chopper, Boost Chopper, Boost-Buck Chopper, Cuk Chopper, Sepic Chopper, and Zeta Chopper.

16.DK22 single-phase AC voltage regulation/power regulation circuit 
is designed according to the relevant contents of "Power Electronics Technology" (4th edition) edited by Professor Wang Zhaoan and Professor Huang Jun of Xi'an Jiaotong University, and realizes the experimental contents of single-phase AC voltage regulation and AC power regulation. The power electronic device used is a bidirectional thyristor. In the AC voltage regulation experiment, a trigger control circuit composed of a bidirectional trigger diode is used; in the AC power regulation experiment, a trigger control circuit composed of a 555 time base circuit is used.
17. ZR07 experimental connection line:

According to the characteristics of different experimental projects, two different experimental connecting lines are equipped. The strong current part adopts a high-reliability sheath structure pistol plug connecting line (there is no possibility of electric shock), and the inside is made of oxygen-free copper wire drawn into a multi-strand wire as thin as a h*r to achieve the purpose of ultra-softness. It is covered with a nitrile polyvinyl chloride insulation layer, which has the advantages of softness, high voltage resistance, high strength, anti-hardening, and good toughness. The plug adopts a solid copper part with a beryllium light copper shrapnel, and the contact is safe and reliable; the weak current part adopts an elastic beryllium light copper exposed structure connecting line, and both wires can only be matched with sockets with corresponding inner holes, which greatly improves the safety and rationality of the experiment.

18. Teaching software

1. Electrical safety and electric shock first *d simulation teaching software

The software uses a combination of two-dimensional and three-dimensional virtual images to teach students the safety and first *d methods of electricity use. The software has single-phase electric shock, two-phase electric shock, step electric shock, low-voltage electric shock first *d, high-voltage electric shock first *d, artificial respiration rescue method, hand-holding breathing rescue method, chest cardiac compression rescue method and other principle explanations and teaching. Single-phase electric shock is divided into m*ntenance of live disconnection, m*ntenance of socket electric shock, outdoor electric shock and other principle demonstrations. Low-voltage electric shock and high-voltage electric shock teaching m*nly expl*n and demonstrate to students how to rescue people in low-voltage electric shock or high-voltage electric shock. Artificial respiration rescue method, hand-holding breathing rescue method, chest cardiac compression rescue method are displayed using 3D virtual simulation technology. After rendering and polishing, the model looks the same as the real part and the picture is realistic. Through practical tr*ning, students can be educated on safe use of electricity in the tr*ning room, improve their safety awareness, learn some self-rescue methods, and take cert*n safety measures to protect themselves when they encounter danger, as well as be familiar with the causes of various electrical accidents and practical operational measures for handling electrical accidents, so as to reduce the occurrence of electrical accidents.

2. M*ntenance of electrical and electronic machinery and professional qualification tr*ning and assessment simulation software

This software is in apk format and can be used on PC or mobile. This software can set faults manually or automatically. This software can select the manual setting of fault points through the green box in the circuit diagram (up to 39 fault points can be set), or the system can automatically set one fault point at random, two fault points at random, three fault points at random, four fault points at random, and five fault points at random. This software has toolbox, component library, magnifying glass, circuit diagram and other functions. You can select a multimeter for detection through the toolbox, select appropriate components through the component library, and use a magnifying glass to clearly understand each component and circuit. This software sets the fault of the motor star-delta starting control circuit and, after various investigations, allows students to understand the working principle and circuit structure of the motor star-delta starting control circuit.

3. Virtual spectrum analyzer, logic analyzer, oscilloscope, three-meter simulation software:

This software is in apk format and can be used on PC or mobile. The functions of this software include: resistance measurement, AC voltage measurement (measuring transformers, if the transformer burns out the multimeter, black smoke will be emitted and the multimeter can be reset), transistor polarity judgment, DC voltage measurement (the light is on when the ammeter is turned on), DC current measurement, and judgment of the quality of capacitors. This software can drag the red and black pen heads at will. When the two pen heads are dragged to the measured object for positioning, a red circle will be displayed. If the positioning is not accurate, no red circle will be displayed. When an incorrect operation is performed (such as the selected range is wrong, the measured data is wrong, etc.), the instrument pointer will not respond, prompting an error to re-measure, etc. This multimeter can select AC voltage, DC voltage, resistance, current, resistance adjustment 0, and can enlarge the displayed data, so that the size of the measured data can be clearly viewed. Students can learn the correct use of multimeters through this software.

4. Single chip microcomputer , PLC programmable design and control virtual simulation software:

This software is developed based on unity3d, and has built-in experimental steps, experimental instructions, circuit diagrams, component lists, connection lines, power on, circuit diagrams, scene reset, return and other buttons. After the connection and code are correct, the 3D machine tool model can be operated through the start/stop, forward motion, and reverse motion buttons. When the line is connected, the 3D machine tool model can be enlarged/reduced and translated.

1. Relay control: Read the experiment instruction manual and enter the experiment. By reading the circuit diagram, select relays, thermal relays, switches and other components in the component list and drag them to the electrical cabinet. Place the limiter on the 3D machine model. You can choose to cover the lid. Some component names can be renamed. Then click the connect line button to connect the terminals. After the machine tool circuit is successfully connected, choose to turn on the power and operate. If the component or line connection is wrong, an error box will pop up and the scene can be reset at any time.

2.PLC control: The experiment is the same as the relay control, with the addition of the PLC control function. After the connection is completed, press the PLC coding button to enter the program writing interface, write two programs, forward and reverse, with a total of 12 ladder diagram symbols. After writing, select Submit for program verification. After successful verification, turn on the power to operate. Error boxes will pop up for components, line connections, and code errors, and the scene can be reset at any time.

3. Single-chip microcomputer control: The experiment is the same as relay control, with the addition of single-chip microcomputer control function. After the connection is completed, enter the programming interface through the C coding button, enter the correct C language code, submit and verify successfully, turn on the power to operate, and a prompt error box will pop up for component, line connection, and code errors, and the scene can be reset at any time.

6. Experimental Project

1. A) Circuit Analysis Experiment

2. Use of basic electrical instruments and calculation of measurement errors

3. Methods to reduce instrument measurement errors

4. Measurement and mapping of volt-ampere characteristics of linear and nonlinear circuit elements

5. Determination of potential and voltage and drawing of circuit potential diagrams

6. Kirchhoff's law verification and fault diagnosis

7. Verification of superposition theorem and fault diagnosis

8. Equivalent transformation of voltage source and current source  

9. Verification of Thevenin's Theorem

10. Norton's Theorem Verification

11. Dual-port network test

12. Verification of the Reciprocity Theorem

13. Experimental study of controlled sources

14. Test of RC first-order circuit response

15. Research on second-order dynamic circuit response

16. Test of impedance characteristics of R, L, and C components

17. RC series and parallel frequency selection network characteristic test

18. Study on R, L, C series resonant circuit and use three-meter method to measure equivalent parameters of AC circuit

19. Research on the phase of sinusoidal steady-state AC circuit (experiment on improving the power factor of fluorescent lamp)

20. Mutual induction experiment

21. Testing of single-phase iron core transformer characteristics

22. Measurement of voltage and current in three-phase AC circuits

23. Measurement of power factor and phase sequence  

2. Power Electronics Technology Experiment

24. Unijunction transistor trigger circuit

25. Sine wave synchronous phase shift trigger circuit experiment

26. Sawtooth Wave Synchronous Phase Shift Trigger Circuit Experiment

27.  Siemens TCA785 integrated trigger circuit experiment

28. Single-phase half-wave controlled rectifier circuit experiment

29. Single-phase bridge half-controlled rectifier circuit experiment

30. Single-phase bridge full-controlled rectification and active inverter circuit experiment

31. Three-phase half-wave controlled rectifier circuit experiment

32. Three-phase bridge half-controlled rectifier circuit experiment

33. Three-phase half-wave active inverter circuit experiment

34. Three-phase bridge full-controlled rectification and active inverter circuit experiment

35. Single-phase AC voltage regulation circuit experiment

36. Single-phase AC power regulation circuit experiment

37. Three-phase AC voltage regulation circuit experiment

38. Single-direction thyristor (SCR) characteristic experiment

39. Gate Turn-Off Thyristor (GTO) Characteristics Experiment

40. Power Field Effect Transistor (MOSFET) Characteristics Experiment

41. Power transistor (GTR) characteristic experiment

42. Insulated bipolar transistor (IGBT) characteristic experiment

43. Single-phase sinusoidal pulse width modulation (SPWM) inverter circuit experiment (IGBT)

44. DC/DC conversion circuit experiment (IGBT)

45. Performance study of DC chopper circuits (six typical circuits: buck chopper circuit, boost chopper circuit, buck-boost chopper circuit, Cuｋ chopper circuit, Sepic chopper circuit, and Zeta chopper circuit) (IGBT)

7. Configuration List