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Require

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illustrate

Figure 4 Explanation content

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Summary

This experiment aims to design and make a parallel system consisting of two single-phase inverters for powering resistive loads or incorporating into a 220V grid. The main control based on STM32F407 is used, and the system is built with the IGBT driver module. High-voltage IGBT modules and capacitor filters are selected to provide stable power output and improve the stability of the output voltage while reducing harmonic distortion. The experiment requires testing various indicators under specific working conditions, including output voltage, frequency, current, efficiency and harmonic distortion rate, etc. In addition, functions such as parallel operation of inverters, parallel operation of inverters and power grids, and output current regulation and distribution also need to be realized.

Keywords: STM32F407, IGBT driver module, power output, voltage stability, harmonic distortion

1 . System solutions

This design uses the STM32 chip as the main control, and the overall system is mainly composed of the main control, sound generator module and sound receiving module.

1.1 Demonstration and selection of the main control module

Option 1: Select STM32F103 master control

Advantages: stable performance, support a variety of peripheral interfaces

Disadvantage: higher power consumption

Solution 2: Select STM32F407 master control

Advantages: powerful performance, sufficient memory, and DSP function

Disadvantages: relatively high price

Solution 3: Select STM32F030 master control

Advantages: low power consumption, high cost performance

Disadvantages: weak performance

After comprehensive consideration, the STM32F103 main control is selected as the core controller of the system, that is, the first solution.

1.2 Demonstration and selection of hardware control scheme

Solution 1: Use piezoelectric ceramic sensors to build a system, and use the following hardware modules to realize functions

Piezoelectric transducers: used to convert electrical signals into acoustic signals and inject them into planar plates

Sound receiving module: used to receive the sound signal transmitted from the flat panel and observe it through the oscilloscope

Solution 2: Use the microphone sensor to build the system, and use the following hardware modules to realize the functions

Microphone sensor: used to receive the acoustic signal transmitted from the flat panel and convert it into an electrical signal

Sound Amplifier: Used to amplify the weak electrical signal output by the microphone sensor

Oscilloscope: Used to observe the signal output by the sound amplifier

After comprehensive consideration, choose the second option, that is, use the microphone sensor to build the system.

3.2 Program design

3.2.1 Program function description

The program generates inverter control signals through STM32F103 to control the single-phase inverter system running in parallel. At the same time, the sound signal in the environment is acquired through the microphone sensor, processed and amplified by the program, and then output to the speaker.

3.2.2 Program flow chart

1. Main program flow chart:

Figure 3-6 Main program flow chart

2. Inverter control algorithm flow chart:

Figure 3-7 Flow chart of inverter control algorithm

4.1.1 Functional test

(1) Percussion sound source localization test

1. Tap once in the specified square.

2. The system completes the detection and positioning within 5 seconds and displays the corresponding grid number.

(2) Magnet disc positioning test

1. Place the magnet disc in a specified square.

2. Start the system with one button, complete the positioning within 15 seconds and display the number of the square where the wafer is located.

(3) Coordinate positioning test

1. Place the magnet disc at any designated position in area M.

2. Start the system with one button, complete the positioning within 20 seconds and display its Cartesian coordinate value, the unit is mm.

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In fact, rigid standards cannot limit us with infinite possibilities, so ah! Come on boys!