Experimental apparatus for power electronics technology

I. Overview

MY-C6Experimental apparatus for power electronics technologyIt is designed for colleges and universitiesPower Electronic Converter TechnologyDeveloped according to the requirements of the practical training outline. The main training content includes basic knowledge of power electronics, power electronic components, typical circuits, and conversion of AC/DC electrical energy.

2、 Technical features

1. Safe and reliable: This device is powered by an isolation transformer and has grounding protection and leakage protection functions. Its safety complies with relevant national standards, ensuring personal safety; According to the characteristics of different experimental projects, two different experimental connection wires are equipped. The strong electrical part adopts a highly reliable sheathed structure connection wire (without any possibility of electric shock), and the weak electrical part adopts an elastic beryllium light copper exposed structure connection wire. Both types of wires can only be matched with corresponding socket holes, which greatly improves the safety and rationality of the experiment.

2. Strong scalability: It can meet the experimental teaching needs of various schools' corresponding courses, and the depth and breadth of experiments can be flexibly adjusted according to needs. Popularization and improvement can be organically combined according to the teaching process. The device adopts a pendant structure, which is easy to replace. If you need to expand functions or develop new experiments, just add components.

3. Strong intuitiveness: The experimental pendant adopts a separated structure, with the experimental schematic and test points on the front, enhancing students' intuitive and rational understanding of the experimental content; The panel layout is reasonable, the wiring is convenient, and students can independently operate experiments, which is conducive to improving their practical hands-on ability.

4. Progressiveness: the experiment involves four kinds of current conversion technology experiments, and most of them are widely used practical circuits, but it is convenient for teaching without losing its simplicity; This device is also considered from the perspective of new devices, incorporating characteristic experiments of new devices, driving of new devices, and modern power electronics technology experiments of typical new device applications, allowing students to have sufficient understanding and knowledge of new devices and keep up with the pace of the times.

3、 Technical performance

1. Input voltage: three-phase four wire~380V ± 10% 50Hz

2. Working environment: The ambient temperature ranges from -10 ℃ to+40 ℃, with a relative humidity of less than 85% (25 ℃) and an altitude of less than 4000m

3. Device capacity: ＜ 1.5kVA

4. Device size: approximately 1600mm×700mm×1600mm。

4Experimental apparatus for power electronics technology-Basic equipment

The training device consists of a control screen, a training table, and various training components

（1） Control screen: usingpendantThe structure is compact, sturdy, and aesthetically pleasing, and the upper layer of the control screen can be hungTraining components.

（2） Training components:

1.PE-01 AC power supply and synchronous transformer components

Provide three-phase adjustable AC power supply (range single-phase:0-250V; three-phase 0-450V), equipped with overcurrent protection and leakage protection functions, with isolated transformer output, safe for practical training, and composed of three synchronous transformers and one three pole three throw switch.

（1) The three-phase power supply first passes through a three-phase leakage protector, and then through a contactor to an isolation transformer, isolating the output from the power grid (floating design).

（2) Current type leakage protection device: If there is leakage in the control panel and the leakage current exceeds a certain value, the power supply will be cut off.

2.PE-02 power diode component

Provide seven high-power rectifier diodes (fuse protection circuit) and one toggle switch for rectification and freewheeling purposes.

3.PE-03 thyristor component

provide6 unidirectional thyristors, used for controllable rectification training, equipped with RC resistance capacitance absorption and fuse protection circuit.

4.PE-04 bidirectional thyristor component

provideThree bidirectional thyristors, used for AC voltage regulation circuit training.

5.PE-05 GTR, MOSFET, IGBT components

provideThere are three types of power devices: GTR (High Power Transistor), MOSFET (Power Field Effect Transistor), and IGBT (Insulated Bipolar Transistor).

6.PE-06 three-phase core transformer component

provideOne 63.5V, 0.8A/127V, 0.4A core transformer.

7.PE-07 lamp group load component

By threeComposed of 250V/4A lamp sockets, it is used as a resistive load during practical training.

8.PE-08 Reactor and Transformer Components

Provide a set of smoothing reactors, available for100mH, 200mH, 700mH selection, one dual 220V transformer

9.PE-9 Given and Voltage Indication Component

Provide continuously adjustable+15V and -15V given voltage with output indication.

10.PE-10 AC power parameter table component

Provide one DC effective value AC digital voltmeter with measurement range0～500V， Accuracy level 0.5, three and a half digit digital display, input impedance 10M Ω.

Provide two true effective value AC digital ammeters with measurement range0～5A， Accuracy level 0.5, three and a half digit digital display.

11.PE-11 DC parameter meter component

Provide one DC digital voltmeter with measurement range0～1000V， Accuracy level 0.5, three and a half digit digital display, input impedance 10M Ω.

Provide two DC digital ammeters with measurement ranges0～5A， Accuracy level 0.5, three and a half digit digital display.

12.PE-12 single-phase thyristor trigger circuit (BT35 single crystal transistor and TCA785 trigger)

Provide single junction transistors to generate trigger signals for controlling rectifier circuits composed of single-phase thyristors.

13.PE-12 B TCA785 Integrated Trigger Circuit

Provide SiemensTCA785， Compared with KC04 (KC09) and others, it is more reliable in identifying zero points, with good pulse homogeneity and a wider phase shift range. At the same time, its output pulses can be freely adjusted manually, which can be used for single-phase rectification or voltage regulation circuit training.

14.PE-13 TC787 Trigger Circuit Component

adoptThe TC787 chip forms a three-phase fully controlled trigger circuit, which has the advantages of stable and reliable output, high input impedance, and good anti-interference performance. It is also easy to install and adjust, and reliable to use. With just one such integrated circuit, the three-phase phase shifting function can be completed.

15.PE-14 Adjustable Resistance Component

provideOne 90 Ω× 2/1.3A adjustable resistor and one 900 Ω× 2/0.41A adjustable resistor are used as pure resistive loads.

16. PE-16 DC chopper circuit training

Provide the components required to form a DC chopper circuit and use specialized onesPWM control integrated circuit SG3525. Can complete typical experiments such as Buck Chopper, Boost Chopper, Boost Buck Chopper in textbooks.

17.PE-17 SPWMPrinciple of Single Intersection Direct Intersection Frequency Conversion
According to general higher educationThe content of the fourth edition of "Power Electronics Technology" edited by Wang Zhao'an and Huang Jun, a key textbook of the "Ninth Five Year Plan", will be developed. Used to demonstrate the principle of AC-DC-AC frequency conversion, mainly to enable students to understand the formation method of SPWM sine wave pulse width modulation signal, understand the characteristics and use of IGBT transistor dedicated integrated drive chip, and be able to complete the following taskspractical trainingproject
1) The process of SPWM wave formation;
2) The working condition and waveform of AC-DC-AC frequency conversion circuit under different loads (resistors, inductors), and the influence of working frequency on the working waveform of the circuit are studied;
3) The working characteristics of IGBT transistor dedicated integrated driver chip.

（3） Training table

The training desktop is made of fireproof, waterproof, and wear-resistant high-density boardThe structure is sturdy, shaped like a rectangular enclosed structure, and has a beautiful and elegant appearance; There are drawers and cabinet doors for storing tools, hanging accessories, and materials. The desktop is used to install the power control screen and provide a spacious and comfortable workspace. The bottom of the training table is equipped with four universal wheels with brakes and four fixed support feet.

（4） Training Connection Line

According to the characteristics of different training projects, two different types of training connection wires are equipped. The strong electrical part adopts a highly reliable sheathed structure connection wire, which is made of oxygen free copper drawn into a hair like thin multi strand wire to achieve ultra soft purpose. It is wrapped with a nitrile polyvinyl chloride insulation layer, which has the advantages of flexibility, high pressure resistance, high strength, anti hardening, and good toughness. The plug is made of solid core copper and covered with beryllium light copper spring, ensuring safe and reliable contact; The weak current part adopts elastic beryllium light copper exposed structure connection, and both types of wires can only be matched with corresponding socket holes, which greatly improves the safety and rationality of practical training.

5、 Training Program

1. Training on Characteristics of Power Devices and Auxiliary Components

(1)Power diode characteristic testing

(2)thyristorSCR characteristic testing

(3)bidirectional thyristorBCR characteristic testing

(4)IGBT characteristic test

(5)MOSFET characteristic testing

(6)GTR characteristic testing

2. Trigger Circuit Training

(1)Single junction transistor trigger circuit（BT35/BT33）

(2)SiemensTCA785 single-phase integrated trigger circuit

(3)SiemensTCA787 three-phase integrated trigger circuit

3. Rectification Circuit Training(AC-DC)

uncontrolled rectification

(1)Single phase half wave uncontrolled rectifier circuit

(2)Single phase full wave bridge uncontrolled rectification

(3)Transformer center tap double half wave uncontrolled rectification

(4)Three phase star connection uncontrolled rectifier circuit

(5)Three phase bridge full wave uncontrolled rectification

controlled rectification

(1)Single-phase half wave controllable rectification

(2)Single phase bridge semi controlled rectifier

(3)Single phase bridge fully controlled rectifier

(4)Transformer center tap double half wave controllable rectification

(5)Three phase star connection half wave controllable rectification

(6)Three phase bridge semi controlled rectifier circuit

(7)Three phase bridge fully controlled rectifier

4. Inverter Circuit Training((DC-AC)

(1)Single phase bridge rectifier active inverter

(2)Three phase bridge rectifier active inverter

(3)Principle of SPWM Single phase Orthogonal Frequency Conversion

5. Communication and Voltage Regulating Circuit Training(AC-AC)

(1)Single phase thyristor AC voltage regulating circuit

(2)Three phase thyristor AC voltage regulating circuit

6.IGBT DC chopper circuit training(DC-DC)

（1) Step-down chopper circuit（（Buck Chopper）

（2) Boost type chopper circuit（Boost Chopper）

（3) Voltage reducing chopper circuit（Boost -Buck Chopper）

6、 Product Configuration Checklist