CN103996338B - Intelligent open type multifunctional Power Electronic Experimentation device - Google Patents

Abstract

The invention relates to an intelligent open type multifunctional power electronic experiment device, which includes a power supply, a module assembly, a display screen and a switch. The display screen adopts a touch screen with multiple function keys, and different circuits can be selected according to needs to realize different module functions. The module assembly has multiple functional modules including a DC chopper circuit module, a phase-controlled rectification circuit module, and a sinusoidal pulse width modulation inverter circuit module; each functional module corresponds to a corresponding printed circuit board, and the printed circuit board contains electronic components and signals Terminals. Circuit expansion and wiring are convenient, and different measuring instruments and loads are connected externally. The power supply adopts a three-phase four-wire AC power supply, which is connected through an isolation transformer and a voltage regulator, and is converted into different levels of AC and DC power supplies required by each module through the internal auxiliary power supply of the device. It is reasonable in design, convenient in operation, simple in structure, and strong intuition, helping students or scientific researchers master basic experimental methods and strengthen training of basic skills.

Description

Intelligent open multifunctional power electronics experiment device

technical field

The invention relates to an intelligent open multifunctional power electronics experiment device, which is suitable for experimental teaching and scientific research of electrical information, control and automation in engineering colleges, and is also suitable for the digital control technology of power electronics applications. Research. The invention can help students or researchers to master basic experimental methods and strengthen the training of basic skills, and on this basis, use the experimental platform provided by the invention to conduct research on various circuits by using various experimental methods.

Background technique

At present, the teaching instrument market provides a wide variety of teaching instruments, but as far as the applicant knows, the experimental platforms for teaching provided by many teaching instrument suppliers mainly focus on the verification of teaching functions. Although the appearance is beautiful and the wiring is convenient, but The disadvantages are also obvious, such as poor visibility and expandability, and the actual shape and circuit structure of the device cannot be understood only by wiring from the panel. Give play to one's own subjective initiative and creative thinking.

The "Modular Electronic Experimental Device" disclosed in Chinese patent document CN2444286 (application number: 00218188.6) is a combined platform composed of several base plates, several connecting plates, connecting columns and guard plates and a circuit module board placed on it. composition. Because this scheme can freely combine single to dozens of base plates into a combined platform, the circuit module boards on it can be processed into various specifications, which is suitable for both digital and analog circuits and digital and analog mixed circuits. In this way, when students conduct circuit experiments and develop and research electronics and circuits, the circuits can be designed in a single form or combined in multiple forms, which is easy to operate, and the wiring is simple and reliable. After researching the device, the applicant found that there are only a few circuits that can provide experiments, and these circuits have a single structure and low performance. As a result, users cannot develop and design circuits on this basis, thereby limiting the application field of the device.

"An Electronic Experimental Device" disclosed in Chinese patent document CN203276673U (application number: 201320214073.1) includes: an electronic experiment board suitable for providing multiple measurement points, the measurement points are located on the back of the electronic experiment board, and includes: current measurement point, voltage measurement point, the back side of the electronic experiment board is provided with a measurement module; the measurement module includes: each current acquisition unit and voltage acquisition unit connected to each current measurement point and voltage measurement point respectively, and each current acquisition unit The voltage acquisition unit is respectively connected to the AD unit, the MCU unit connected to the AD unit is suitable for detecting corresponding current and voltage data, and the LED display unit connected to the MCU unit is suitable for displaying corresponding current and voltage data. When in use, the user can view the relevant data of each test point of the electronic experiment board in real time. When a certain parameter of the electronic experiment board is adjusted, the user can know the adjusted data changes in time to judge whether the experiment is successful. The existing problem is that the LED display unit is too simple. The electronic experiment board it adopts can provide limited experimental content and has certain limitations. The MCU and AD sampling ports are limited, and the data acquisition rate and storage function requirements are not considered, thus limiting its application.

Chinese patent document CN201392602 discloses "A Program-controlled Instrument Virtual Experiment System with Network Control and Management Function" (application number: 200920107000.6), which includes a main server, an experimental circuit, a customer service host connected to the main server, and a The bar code scanner that client host computer is connected; Described main server comprises main control platform, experimental circuit test part and virtual circuit test part, and experimental circuit test part is connected with experimental circuit, and virtual circuit test part is controlled by software module on main server to realise. This system provides two experimental methods of real circuit and virtual circuit. Customers can choose the experimental method through the client host, and conduct experimental operations through remote network control to realize remote data collection, data analysis and result output functions. The invention is easy to operate, realizes the sharing of equipment resources, and reduces the cost of laboratory resources. Its shortcoming is that the realization of virtual experiments through network management makes users lack the sense of being on the scene. And still have certain deficiency for the training of improving user's actual operation skill. This device is not conducive to the improvement of the students' hands-on ability required in the practical training, and is not conducive to the intuitive familiarity and practicality of the functions of the electronic devices for the students.

Contents of the invention

The object of the present invention is to improve on the deficiencies in the above-mentioned prior art, propose and study an intelligent open multifunctional electronic power experiment device. The invention can make and complete various experiments according to the experiment content, the device used for the experiment has low complexity, the layout of components is reasonable and simple, the connection is convenient, the operation is easy, and the basic needs of teaching and scientific research can be met.

The technical solution of the present invention is to include a power supply, a module assembly, a display screen and a switch. The module assembly has multiple functional modules with different circuit functions, and the display screen is provided with function keys. It is characterized in that each function module realizes The function is selected and set by the function keys on the display screen. The circuit used by each functional module is made into a physical circuit through the corresponding printed circuit board. The printed circuit board contains electronic components and signal terminals, measuring instruments and The load is connected from the outside; the power supply adopts an external AC power supply, which is connected through an isolation transformer and a voltage regulator, and is converted into different levels of AC and DC power required by each functional module through the internal auxiliary power supply of the device.

It is characterized in that the display screen adopts a touch screen, and the touch screen is equipped with multiple function keys, which has a convenient and fast man-machine interface. By operating multiple function keys and function switches, different circuit function selections and control parameter settings can be realized. Complete the selected teaching and research experiments; the touch screen is an 8-inch 65K color TFT touch screen.

It is characterized in that a plurality of functional modules with different circuit functions are combined into a teaching experiment special module assembly, and the teaching experiment special module assembly includes a DC conversion circuit module, a phase-controlled rectification circuit module, and a sinusoidal pulse width modulation inverter circuit module.

It is characterized in that the circuit used by the DC conversion circuit module is composed of an input 24V power supply interface, a DC drive interface, a forward circuit, a Boost boost circuit, a Buck step-down circuit, a full/half bridge circuit, and a DC detection interface, wherein the input 24V The power interface, DC drive interface and DC detection interface are the common interfaces of the DC conversion circuit module. Different interfaces, so as to realize the functions of different DC conversion circuits.

It is characterized in that the circuit used by the phase-controlled rectification circuit module consists of a phase-controlled AC power interface, a phase-controlled drive interface, a single-phase half-wave phase-controlled rectifier circuit, a single-phase full-bridge phase-controlled rectifier circuit, and a three-phase full-bridge phase-controlled rectifier circuit and phase-controlled detection interface; among them, the phase-controlled AC power interface, phase-controlled drive interface and phase-controlled detection port are the public interfaces of the phase-controlled rectification circuit module, which are respectively connected with single-phase half-wave phase-controlled rectification circuit and single-phase full-bridge Phase-controlled rectification circuit, three-phase full-bridge phase-controlled rectification circuit; the main circuit and interface circuit adopt relay control selection, which can realize the functions of different rectification circuits through different combinations; the circuit used in the phase-controlled rectification circuit module can be topology, deformation, and Redundancy, able to complete the performance research of single-phase and three-phase phase-controlled rectification circuits.

It is characterized in that the sinusoidal pulse width modulation inverter circuit module is composed of an inverter AC power interface, an inverter drive interface, a single-phase full-bridge inverter circuit, a three-phase full-bridge inverter circuit and an inverter detection interface; wherein, the inverter The AC power interface, the inverter drive interface and the inverter detection interface are the common interfaces of the sinusoidal pulse width modulation inverter circuit module, which are respectively connected with the single-phase full-bridge inverter circuit and the three-phase full-bridge inverter circuit, which can complete single-phase and Research on the characteristics of three-phase sinusoidal pulse width modulation inverter circuit.

It is characterized in that the touch screen is connected with a DSP control board, and the DSP control board adopts a DSP chip to complete the closed-loop control. Select and send different driving signals, and can send up to 12 driving signals at the same time. The driving signals include PWM123/AB and PWM456/AB; among them, the driving signal PWM123/AB is converted into isolated PWM driving signals T1AB, T2AB, T3AB, the driving signal PWM456/AB is converted into the current trigger signal VT1-VT6 through the three-phase phase-controlled driving board; in the DC conversion circuit module, the Boost boost circuit, the Buck step-down circuit, and the forward circuit are driven by a single tube, and the drive signal It is T1A; the half-bridge circuit is driven by the upper and lower symmetrical double tubes, and the driving signal is T1AB; the full-bridge circuit is driven by two bridge arms, and the driving signals are T1AB and T2AB; in the phase-controlled rectification circuit module, the single-phase half-wave phase-controlled rectification circuit It is a single-tube drive, the drive signal is VT1, the drive signal of the upper tube of the single-phase full-bridge phase-controlled rectifier circuit is VT1/3, and the drive signal of the lower tube is VT4/6; the drive signal of the upper tube of the three-phase full-bridge phase-controlled rectifier circuit is VT1/3 It is VT1/3/5, and the driving signal of the lower tube is VT4/6/2; in the sinusoidal pulse width modulation inverter circuit module, the driving signals of the two bridge arms of the single-phase full-bridge inverter circuit are T1AB, T2AB, three-phase full-bridge The driving signals of the three bridge arms of the bridge inverter circuit are respectively T1AB, T2AB and T3AB.

The invention is reasonable in design, convenient in operation, simple in structure and strong intuition, and can help students or scientific research personnel master basic experimental methods and strengthen the training of basic skills. Its advantages are:

1) Modularization, which integrates the functions of equipment required for multiple experiments, thus saving equipment purchase funds.

2) It provides a considerable development and innovation environment for students and teachers, and can carry out hardware design and software development according to the needs of the design, until the final software and hardware testing. When the invention is used in teaching, it can effectively improve the hands-on ability of students and develop students' innovative thinking.

3) It is convenient for maintenance and upgrading. When the equipment fails, the cause of the failure can be quickly found out, and the maintenance is also very convenient; at the same time, it can be updated according to the development of technology, thereby saving equipment transformation and repair funds.

4) It occupies a small area and can save laboratory land. It does not need to set up special power control devices, cable trenches, cement piers, etc., and the invention can be put into use with only three-phase four-wire power supply.

5) The present invention has a reasonable structure and complete functions, and the provided parameter characteristics can simulate a general-purpose experimental unit; the experimental unit has small capacity, low power consumption, and complete configuration.

6) The connection line of the present invention is separated by strong and weak electricity, and the strong electricity plug and the weak electricity plug cannot be inserted into each other, so as to avoid the strong electricity connecting to the weak electricity equipment and causing damage to the equipment; the circuit connection method is safe, reliable, fast and simple.

7) The power supply is isolated by a three-phase isolation transformer, equipped with a voltage-type leakage protection device and a current-type leakage protection device, which effectively protects the personal safety of the operator and creates a prerequisite for an open laboratory.

Description of drawings

Fig. 1, basic structural block diagram of the present invention;

Fig. 2, the schematic diagram of the external structure of the present invention;

Fig. 3, the schematic diagram of internal structure of the present invention;

Fig. 4, the schematic diagram of the power interface of the present invention;

Fig. 5, the circuit block diagram of the DC chopper circuit module that the present invention adopts;

Fig. 6, the circuit block diagram of the phase-controlled rectification circuit module that the present invention adopts;

Fig. 7, the circuit block diagram of the sinusoidal pulse width modulation inverter circuit module that the present invention adopts;

Fig. 8 is a schematic diagram of the signal interface of each circuit module of the present invention.

In the figure: 1. External AC power supply; 2. Isolation transformer; 3. Voltage regulator; 4. Measuring instrument; 5. Voltmeter; 6. Ammeter; 7. Oscilloscope; 8. Special module components for teaching experiments; 9. Power switch ;10. DC conversion circuit module; 11. Phase-controlled rectification circuit module; 12. Sinusoidal pulse width modulation inverter circuit module; 13. Display screen; 14. Load; 15. Motor; 16. Load box; 17. Cabinet body; 18. Indicator light; 19. Three-phase uncontrolled rectification main circuit; 20. Three-phase phase-controlled drive board; 21. DC converter board; 22. DSP control board; 23. Control auxiliary power board; 24. 4-way 24V auxiliary Power board; 25. Detection drive protection board; 26. Three-phase PWM drive board; 27. AC power input charging protection circuit; 28. Input 24V power interface; 29. Forward circuit; 30. Boost circuit; 31. Buck Step-down circuit; 32. Full/half-bridge circuit; 33. DC detection interface; 34. DC drive interface; 35. Phase-controlled AC power interface; 36. Single-phase half-wave phase-controlled rectifier circuit; 37. Single-phase full-bridge phase 38. Three-phase full-bridge phase-controlled rectifier circuit; 39. Phase-controlled detection port; 40. Phase-controlled drive interface; 41. Inverter AC power interface; 42. Single-phase full-bridge inverter circuit; 43. Three-phase Full bridge inverter circuit; 44, inverter detection interface; 45, inverter drive interface.

detailed description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

As shown in Fig. 1, the present invention includes a power supply, a module assembly, a display screen 13 and a switch. Switch comprises power switch 9 and function switch. The display screen 13 adopts an 8-inch 65K color TFT touch screen, which is equipped with multiple function keys and has a convenient and quick man-machine interface. By operating multiple function keys and function switches, different circuit function selections and control parameter settings can be realized, and the selected teaching and scientific research experiments can be completed through the guidance of the touch screen. The modular assembly has multiple functional modules with different circuit functions. A plurality of functional modules with different circuit functions are combined to form a special module assembly 8 for teaching experiments. The power supply adopts an external AC power supply 1, and the external AC power supply 1 adopts a three-phase four-wire system of 380V AC power supply. The power switch 9 is an on-off control for the external AC power supply 1 to supply power to the teaching experiment special module assembly 8. An external AC power supply 1 is connected through an isolation transformer 2, a voltage regulator 3 and a power switch 9. The special module assembly 8 for teaching experiments includes a DC conversion circuit module 10, a phase-controlled rectification circuit module 11, and a sinusoidal pulse width modulation inverter circuit module 12. These functional modules can be used alone or in combination to complete more than 20 power electronics and power transmission modules. side experiments. The circuit used by each functional module is determined according to the function, and the circuit used by it is made into a physical circuit through a corresponding printed circuit board (PCB). Only electronic components and signal interface terminals are installed on the printed circuit board (PCB), excluding measuring instruments. The measuring instruments 4 required for the experiment are externally connected. The measuring instrument 4 includes a voltmeter 5, an ammeter 6 and an oscilloscope 7, which are selected according to the needs when carrying out specific experiments. The load 14 is provided externally, and the load 14 includes a motor 15 and a load box 16, which can be selected according to requirements when carrying out specific experiments.

As shown in FIG. 2 , the present invention adopts a cabinet body 17 to install module components, a display screen 13 and an external AC power supply 1 . Display screen 13, power switch 9 and indicator light 18 are equipped with on the front panel of cabinet body 17. The display screen 13 adopts a touch screen. The touch screen has a convenient and fast man-machine interface. By operating multiple function keys, circuit function selection and control parameter setting can be realized, and the selected teaching experiment can be completed through the guidance of the touch screen. The touch screen adopts 8-inch 65K color TFT touch screen. The indicator light 18 is used to indicate the working state of the power supply.

As shown in Figure 3, the cabinet body 17 is internally provided with a physical circuit corresponding to the circuit adopted by each special function module, including an AC power input charging protection circuit 27, a three-phase uncontrolled rectifier board 19, a three-phase phase-controlled drive Board 20, DC converter board 21, DSP control board 22, control auxiliary power supply 23, 4-way 24V auxiliary power supply board 24, detection drive protection board 25, three-phase PWM drive board 26. Among them, the control auxiliary power supply 23, the 4-way 24V auxiliary power supply board 24, the detection driving protection board 25, the three-phase PWM driving board 26, the AC power input charging protection circuit 27 are installed in the lower part of the cabinet body 17, and the DSP control board 22 is installed in the bottom of the cabinet body 17. In the middle of the cabinet body 17 , the three-phase uncontrolled rectifier board 19 , the three-phase phase-controlled drive board 20 , and the DC converter board 21 are installed on the upper part in the cabinet body 17 .

As shown in Fig. 4, the power input of the present invention is a three-phase 380 AC power supply, which is supplied to the physical circuit of the phase-controlled rectification circuit module 11 and the sinusoidal pulse width modulation inverter circuit module 12 through the isolation transformer 2, the voltage regulator 3 and the power switch 9 The physical circuit power supply. The power switch 9 adopts a three-phase 4P power switch QS, and other parts of power are provided by auxiliary power. The present invention adopts two auxiliary power supplies, the control auxiliary power supply board 23 is used as the auxiliary power supply inside the device to provide +5V, +/-12V power supply for the DSP control board 22; the 4-way 24V auxiliary power supply board 24 is used as the auxiliary power supply inside the device to provide 4 There are +/-24V power supply channels, the first channel supplies power to the phase control drive board 20, and the second channel provides input DC power to the DC converter board 21 through the three-phase PWM drive board 26. The above-mentioned two auxiliary power sources are respectively connected with the external AC power source 1 through the voltage regulator 3 and the isolation transformer 2 .

As shown in Figure 5, the circuit adopted by the DC conversion circuit module 10 of the present invention consists of an input 24V power supply interface 28, a DC drive interface 34, a forward circuit 29, a Boost step-up circuit 30, a Buck step-down circuit 31, a full/half bridge circuit 32 and a DC detection interface 33. Among them, the input 24V power interface 28, the DC drive interface 34 and the DC detection interface 33 are the common interfaces of the DC conversion circuit module, and the input 24V power interface 28, the DC drive interface 34 and the DC detection interface 33 as the public interface are respectively connected to the forward Circuit 29, Boost voltage boosting circuit 30, Buck voltage reduction circuit 31, full/half bridge circuit 32.

As shown in Figure 6, the circuit adopted by the phase-controlled rectification circuit module 11 of the present invention consists of a phase-controlled AC power interface 35, a phase-controlled drive interface 40, a single-phase half-wave phase-controlled rectifier circuit 36, and a single-phase full-bridge phase-controlled rectifier circuit 37, a three-phase full-bridge phase-controlled rectifier circuit 38, composed of a phase-controlled detection port 39. Among them, the phase-controlled AC power interface 35, the phase-controlled driving interface 40 and the phase-controlled detection port 39 are the public interfaces of the phase-controlled rectification circuit module 11, and the phase-controlled AC power interface 35, the phase-controlled driving interface 40 and the phase-controlled The detection port 39 is respectively connected with a single-phase half-wave phase-controlled rectification circuit 36 , a single-phase bridge type phase-controlled rectification circuit 37 , and a three-phase bridge type phase-controlled rectification circuit 38 .

As shown in Figure 7, the sinusoidal pulse width modulation inverter circuit module 12 of the present invention consists of an inverter AC power interface 41, an inverter drive interface 45, a single-phase full-bridge inverter circuit 42, a three-phase full-bridge inverter circuit 43, The inverter detection interface 44 is formed. Among them, the inverter AC power interface 41, the inverter drive interface 45 and the inverter detection interface 44 are the public interfaces of the sinusoidal pulse width modulation inverter circuit module 12, and the inverter AC power interface 41 and the inverter drive interface 45 as the public interface The single-phase full-bridge inverter circuit 42 and the three-phase full-bridge inverter circuit 43 are connected with the inverter detection interface 44 respectively.

As shown in Figure 8, the present invention adopts DSP chip, and DSP chip adopts the chip TMS320F28335 of TI Company, and DSP is installed on DSP control board 22, and touch screen is matched with DSP control board 22, and DSP control board 22 selects according to touch screen selection circuit function difference and sends out Different driving signals, up to 12 driving signals can be sent out at the same time, and the driving signals include PWM123/AB and PWM456/AB. Among them, the drive signal PWM123/AB is converted into isolated PWM drive signals T1AB, T2AB, T3AB through the three-phase PWM drive board 26, and the drive signal PWM456/AB is converted into current-type trigger signals VT1-VT6 through the three-phase phase-controlled drive 20. In the DC conversion circuit module 10, the Boost step-up circuit 30, the Buck step-down circuit 31, and the forward circuit 29 are driven by a single tube, and the drive signal is T1A; the half-bridge circuit is driven by two symmetrical tubes up and down, and the drive signal is T1AB; The circuit is driven by two bridge arms, and the driving signals are T1AB and T2AB. In the phase-controlled rectification circuit module 11, the drive signal of the single-phase half-wave phase-controlled rectifier circuit 36 is VT1; the drive signal of the upper tube of the single-phase full-bridge phase-controlled rectifier circuit 37 is VT1/3, and the drive signal of the lower tube is VT4/3. 6. The driving signal of the upper tube of the three-phase full-bridge phase-controlled rectifier circuit 38 is VT1/3/5, and the driving signal of the lower tube is VT4/6/2. In the sinusoidal pulse width modulation inverter circuit module 12, the driving signals of the two bridge arms of the single-phase full-bridge inverter circuit 42 are respectively T1AB and T2AB, and the driving signals of the three bridge arms of the three-phase full-bridge inverter circuit 43 are respectively For T1AB, T2AB, T3AB.

In order to complete the closed-loop control of the circuit in the present invention, each part of the circuit includes input voltage detection, output voltage, and current detection. The detection signal enters the detection drive protection board 25 through the differential detection circuit or Hall sensor, and then passes through the DSP control board connected with the touch screen. 22 for control, the closed-loop control and overvoltage and overcurrent protection functions of the system are completed through the digital controller. The design power capacity and margin of the present invention are large, and on this basis, the secondary development of the physical device can be carried out according to the needs of users.

Technical parameter of the present invention:

(1) Input voltage Three-phase four-wire system 380V±10% 50±1Hz

(2) Working environment The ambient temperature range is -5～40°C, the relative humidity is ≤75%, and the altitude is ≤1000m

(3) Power capacity: ≤3kVA

(4) Dimensions: length × width × height = 1700㎜ × 700㎜ × 600㎜.

Reliability of the present invention lies in:

1) The power supply is isolated by a three-phase isolation transformer, equipped with a voltage-type leakage protection device and a current-type leakage protection device, which effectively protects the personal safety of the operator and creates a prerequisite for an open laboratory.

2) The experimental connection line is separated by strong current and weak current, and the plugs (strong current plug and weak current plug) used by the two cannot be inserted into each other, so as to avoid strong current connecting to weak current equipment and causing damage to the equipment.

3) Voltage and current software and hardware protection. Each module is equipped with software and hardware voltage and current protection devices. Once overvoltage and overcurrent are found, the system will automatically block the drive signal, effectively preventing device damage.

4) Reliable short circuit protection. Most of the power inside the device is provided by a single-ended flyback auxiliary power supply. According to the characteristics of the flyback power supply, when the output terminal is short-circuited, the pulse is automatically blocked through control and adjustment, and the energy output is automatically blocked, thereby preventing short-circuit from causing device damage.

The experimental content that the present invention provides comprises:

1) The experimental content provided by the DC chopper circuit module includes: power field effect transistor (MOSFET, IGBT) characteristic verification; MOSFET, IGBT drive and protection circuit; performance research of DC chopper circuit; step-down BUCK circuit experiment; BOOST circuit experiment; single-ended forward power supply experiment; single-ended flyback power supply experiment; full-bridge DC-DC switching regulated power supply conversion circuit; half-bridge DC-DC switching regulated power supply conversion circuit; DC power supply control characteristics research experiment; rectifier circuit Active power factor correction;

2) The experimental content provided by the phase-controlled rectification circuit module includes: single-phase half-wave controllable rectification circuit; single-phase bridge half-controlled rectification circuit; single-phase bridge full-control rectification and active inverter circuit; three-phase half-wave Controllable rectification circuit; three-phase half-wave active inverter circuit; three-phase bridge half-controlled rectification circuit; three-phase bridge full-control rectification and active inverter circuit;

3) The experimental content provided by the sine pulse width modulation inverter circuit module includes: SPWM pulse width modulation technology experiment; performance analysis of inverter power drive circuit; single-phase sine wave pulse width modulation (SPWM) inverter circuit; three-phase sine wave Pulse width modulation (SPWM) frequency conversion principle; three-phase saddle wave pulse width modulation frequency conversion principle; three-phase space voltage vector SVPWM frequency conversion principle; V/f curve measurement under SPWM, saddle wave, and space voltage vector modulation methods.

Claims (3)

1. An intelligent open multifunctional power electronics experiment device, including a power supply, a module assembly, a display screen (13) and a switch. The module assembly has multiple functional modules with different circuit functions, and the display screen (13) is provided with function keys , which is characterized in that the functions realized by each functional module are selected and set by the function keys provided on the display screen (13), and the circuit used by each functional module is made into a physical circuit through a corresponding printed circuit board, and the printed circuit The board contains electronic components and signal terminals, and the measuring instrument (4) and load (14) are externally connected; the power supply adopts an external AC power supply (1), and the external AC power supply (1) is connected through an isolation transformer (2) and a voltage regulator The device (3) is connected, and the auxiliary power supply inside the device is converted into different grades of AC and DC power required by each functional module; multiple functional modules with different circuit functions are combined into a special module component (8) for teaching experiments, and a special module for teaching experiments The component (8) includes a DC conversion circuit module (10), a phase-controlled rectification circuit module (11), and a sinusoidal pulse width modulation inverter circuit module (12); the circuit used by the DC conversion circuit module (10) is powered by an input 24V power supply Interface (28), DC drive interface (34), forward circuit (29), Boost voltage boosting circuit (30), Buck voltage reduction circuit (31), full/half bridge circuit (32), DC detection interface (33) Composition, wherein the input 24V power interface (28), the DC drive interface (34) and the DC detection interface (33) are the public interfaces of the DC conversion circuit module (10), and are respectively connected with the forward circuit (29), Boost The circuit (30), Buck step-down circuit (31), full/half bridge circuit (32), and the DC conversion circuit module (10) realize the functions of different DC conversion circuits according to the switching of different interfaces of the relay; the phase control The circuit used in the rectification circuit module (11) consists of a phase-controlled AC power interface (35), a phase-controlled drive interface (40), a single-phase half-wave phase-controlled rectification circuit (36), and a single-phase full-bridge phase-controlled rectification circuit (37). , a three-phase full-bridge phase-controlled rectifier circuit (38) and a phase-controlled detection port (39); among them, the phase-controlled AC power interface (35), the phase-controlled drive interface (40) and the phase-controlled detection port (39) are phase-controlled The public interface of the controlled rectification circuit module (11) is respectively connected with a single-phase half-wave phase-controlled rectification circuit (36), a single-phase full-bridge phase-controlled rectification circuit (37), and a three-phase full-bridge phase-controlled rectification circuit (38); The main circuit and the interface circuit are selected by relay control, which can realize the functions of different rectification circuits through different combinations; the circuit adopted by the phase-controlled rectification circuit module (11) can be topological, deformed, has redundancy, and can complete single-phase and three-phase Research on the performance of the phase-controlled rectification circuit; the sinusoidal pulse width modulation inverter circuit module (12) consists of an inverter AC power interface (41), an inverter drive interface (45), a single-phase full-bridge inverter circuit (42), Composed of a three-phase full-bridge inverter circuit (43) and an inverter detection interface (44); wherein, the inverter AC power interface (41), The inverter drive interface (45) and the inverter detection interface (44) are public interfaces of the sinusoidal pulse width modulation inverter circuit module (12), which are connected with the single-phase full-bridge inverter circuit (42) and the three-phase full-bridge inverter circuit respectively. inverter circuit (43), which can complete the characteristic research of single-phase and three-phase sinusoidal pulse width modulation inverter circuits. 2. The intelligent open multifunctional power electronics experiment device according to claim 1, characterized in that the display screen (13) adopts a touch screen, the touch screen is equipped with multiple function keys, and has a convenient and quick man-machine interface. Multiple function keys and function switches can realize different circuit function selection and control parameter setting, and complete the selected teaching and scientific research experiments through the guidance of the touch screen; the touch screen is an 8-inch 65K color TFT touch screen. 3. The intelligent open multifunctional power electronics experiment device according to claim 2, characterized in that, the touch screen is connected with a DSP control board (22), and the DSP control board (22) adopts a DSP chip to complete signal acquisition and closed loop Control, the DSP chip adopts TI’s chip TMS320F28335, the DSP chip is installed on the DSP control board (22), and the DSP control board (22) selects and sends different driving signals according to the function of the touch screen selection circuit, and can send up to 12 driving signals at the same time , the drive signals include PWM123/AB and PWM456/AB; wherein, the drive signal PWM123/AB is converted into isolated PWM drive signals T1AB, T2AB, T3AB through the three-phase PWM drive board (26), and the drive signal PWM456/AB is controlled by the three-phase phase control The drive board (20) is converted into current-type trigger signals VT1-VT6; in the DC conversion circuit module (10), the Boost circuit (30), the Buck circuit (31), and the forward circuit (29) are driven by a single tube , the driving signal is T1A; the half-bridge circuit is driven by two symmetrical tubes up and down, and the driving signal is T1AB; the full-bridge circuit is driven by two bridge arms, and the driving signals are T1AB and T2AB; The half-wave phase-controlled rectifier circuit (36) is driven by a single tube, and the drive signal is VT1. The drive signal of the upper tube of the single-phase full-bridge phase-controlled rectifier circuit (37) is VT1/3, and the drive signal of the lower tube is VT4/6; The upper tube drive signal of the phase-full-bridge phase-controlled rectifier circuit (38) is VT1/3/5, and the lower tube drive signal is VT4/6/2; in the sinusoidal pulse width modulation inverter circuit module (12), the single-phase full-bridge The driving signals of the two bridge arms of the inverter circuit (42) are T1AB, T2AB, and the driving signals of the three bridge arms of the three-phase full-bridge inverter circuit (43) are respectively T1AB, T2AB, and T3AB.