Development Of Nanosecond Level Double Pulse Power Supply Based On Micro Electrochemical Machining

Pulse power supply is one of the most important components of electrochemical machining equipment,which affects the machining accuracy and surface quality of electrochemical machining.The development of a power supply suitable for micro electrochemical machining is of great significance for improving the machining accuracy of complex electrochemical machining surfaces and reducing the dependence on foreign equipment.This article aims to develop a nanosecond dual-pulse power supply for micro electrochemical machining.By analyzing the research status at home and abroad,it is found that the existing pulsed power supplies only use the intermittent pulse to make them disappear in terms of removing the sustaining voltage and the inter-electrode capacitance,without designing a dedicated circuit in the power supply structure,resulting in unsatisfactory results.This article proposes a dual-pulse power supply scheme based on the existing pulse power supply structure.The drive chopper module is designed to provide voltages of different polarities to the electrodes during processing and during processing intervals.By controlling the size of the two voltages,the frequency and duty cycle of the power supply,the current pulse power supply is improved to a certain extent.Eliminate the shortcomings of inter-electrode capacitance and maintenance voltage.Power R&D includes two parts:hardware and software.The hardware includes power supply and working power supply module,main control module,drive chopper module,pulse generation module,protection and other modules.The software includes pulse width modulation,five-way button and OLED,serial communication,IIC development.The user uses the button to set the power parameters.When the confirm button is pressed,the main control module transmits the power parameters set by the user to the pulse generator module through I2C communication;the pulse generator module generates a pulse signal with a specified frequency and duty cycle.Control and drive the chopper module to generate a pulse voltage with adjustable voltage.Finally,use the pulse output from the drive chopper module for processing.During this process,the OLED screen can display power parameters in real time.The power supply developed in this paper has a frequency of 10kHz?5MHz and a duty cycle adjustment range of 10%?90%;the first processing voltage is 1.5V?15V,the second auxiliary processing voltage is 1.5V?5V,and the two voltage sources are respectively It is controlled by two pulse signals that are opposite to each other to eliminate the problems of maintaining voltage and inter-electrode capacitance between pulses,and the dual-pulse power supply is thus realized.Finally,test the output of the power supply with a general source analog oscilloscope.Observe the voltmeter on the power supply panel that the size of the first and second voltage sources are the same as the maximum and minimum values of the power output waveform measured by the oscilloscope,and the frequency is equal to The duty cycle is the same as that of the OLED display screen,so it is judged that the test of the nanosecond-level dual-pulse power supply for micro electrochemical machining has reached the expected design goal and can be used for micro electrochemical machining.