CN205496719U - A nanosecond level pulse width pulse generator for electrochemical machining - Google Patents

Abstract

The invention relates to a nanosecond pulse width pulse power supply for electrochemical machining, which relates to the pulse power supply. There are single-chip microcomputer, programmable sine wave generator, digital potentiometer, comparator, optocoupler, current limiting resistor, processing positive pole, processing negative pole, triode and DC power supply; the output ports of the single-chip microcomputer are respectively connected to the programmable sine wave generator The input end of the digital potentiometer, the output end of the programmable sine wave generator and the output end of the digital potentiometer are respectively connected to the input end of the comparator, the output end of the comparator is connected to the input end of the optocoupler, and the output end of the optocoupler The output terminal is connected to the input terminal of the triode, the output terminal of the triode is connected to a DC power supply, the DC power supply is connected to one end of the current limiting resistor, the other end of the current limiting resistor is connected to the processing positive pole, and the processing positive pole is connected to the triode through the processing negative pole. The composition is simple, and various components are also easy to buy in the market, so it has the advantages of low cost, easy acquisition, easy control, and wide application range.

Description

A Nanosecond Pulse Width Pulse Power Supply for Electrochemical Machining

technical field

The utility model relates to a pulse power supply, in particular to a nanosecond pulse width pulse power supply for electrochemical processing.

Background technique

As the main component of the electrochemical machining machine tool, the pulse power supply provides the voltage required for the electrochemical reaction to generate electrolytic corrosion to remove metal. It is one of the key equipment that affects the processing technology index. Its performance directly affects the speed, precision, stability, workpiece surface roughness and electrode processing resistance of electrochemical processing, and it is also a symbol of product upgrading.

Relevant studies have shown that electrochemical pulse electrolytic machining can significantly improve the electrolytic machining process, and is one of the important measures to realize micro-electrolytic machining. In electrochemical pulse electrolytic machining, the periodic renewal and discontinuity of the electrolyte enables the electrolytic products in the gap, such as dissolved metals, precipitated hydrogen and Joule heat, to be removed in time, so it can be processed in a more efficient process than traditional direct current. Processing with small processing gaps and higher current densities. High current density can improve surface processing quality, while small gap can significantly improve processing accuracy.

Although the traditional form of electrochemical machining pulse power supply is used in some occasions, it can no longer fully meet some processing requirements. With the development of power electronics technology, computer control technology and the continuous enrichment of modern control theory, the pulse power supply technology for electrochemical processing has also been greatly developed. There have been many new types of pulse power supplies and new development trends. At present, there are two main research trends for electrochemical machining pulse power supply: one is electroforming pulse power supply based on cathodic deposition additive manufacturing technology, and the other is electrolytic machining pulse power supply based on anode dissolution subtractive manufacturing technology.

The electrochemical pulse power supply generally uses high-frequency devices (such as CPLD, FPGA) to send out the required pulses, which are amplified to drive the switching tubes of the subsequent stage, so as to obtain the nanosecond pulses required for electrochemical processing.

Contents of the invention

The purpose of the utility model is to provide a nanosecond-level pulse width pulse power supply for electrochemical processing that can generate nanosecond-level pulses with controllable pulse width.

The utility model is equipped with a single-chip microcomputer, a programmable sine wave generator, a digital potentiometer, a comparator, an optocoupler, a current limiting resistor, a processing positive electrode, a processing negative electrode, a triode and a DC power supply;

The output port of the single-chip microcomputer is respectively connected to the input end of the programmable sine wave generator and the input end of the digital potentiometer, and the output end of the programmable sine wave generator and the output end of the digital potentiometer are respectively connected to the input end of the comparator, and the comparison The output terminal of the device is connected to the input terminal of the optocoupler, the output terminal of the optocoupler is connected to the input terminal of the triode, the output terminal of the triode is connected to the DC power supply, the DC power supply is connected to one end of the current-limiting resistor, and the other end of the current-limiting resistor is connected to the processing positive electrode. The positive pole is processed and the negative pole is connected with the triode.

The single-chip microcomputer controls the digital potentiometer to provide a stable reference voltage for the high-speed comparator. The single-chip microcomputer controls the programmable sine wave generator to generate a sine wave signal of the required frequency. After the signal passes through the high-speed comparator, it is intercepted and becomes a pulse signal. After high-speed optocoupler isolation, the transistor is turned on and off, and the DC power supply provides voltage. After the current is limited by the current-limiting resistor, nanosecond-level processing pulses will be generated between the processing positive electrode and the processing negative electrode.

The utility model uses a combination of a sine wave generator, a digital potentiometer and a high-speed comparator to obtain high-frequency pulses. By programming the single-chip microcomputer or the host computer can send instructions to the single-chip microcomputer through serial communication, the single-chip microcomputer controls the programmable sine wave generator and digital potentiometer to obtain the required frequency and pulse width.

The output pulse frequency of the utility model is determined by the frequency of the sine wave sent by the sine wave generator, and the pulse width is determined by the reference voltage provided by the digital potentiometer to the high-speed comparator.

The composition of the utility model is quite simple, and various components are also easy to buy in the market, so it has the advantages of low cost, easy acquisition, easy control, wide application range and the like.

In the utility model, the digital potentiometer generates different resistance values through the control of the single-chip microcomputer, obtains different voltage values after voltage division, and provides a reference voltage for the high-speed comparator, and the programmable sine wave generator produces sine waves of different frequencies through the control of the single-chip microcomputer Wave signal, the signal is intercepted into a pulse signal by a high-speed comparator, and after isolation by a high-speed optocoupler, it drives a high-speed triode to generate a pulse with a nanosecond pulse width.

The innovation point of the utility model is that the high-speed comparator is used to intercept the sine wave, and the nanosecond-level pulse for electrochemical processing is obtained in this novel way.

Description of drawings

Fig. 1 is a circuit composition block diagram of an embodiment of the utility model.

detailed description

Referring to Fig. 1, the embodiment of the utility model is provided with a single chip microcomputer 1, a programmable sine wave generator 2, a digital potentiometer 3, a comparator 4, an optocoupler 5, a current limiting resistor 6, a processing positive electrode 7, a processing negative electrode 8, and a triode 9 and DC power supply 10.

The output port of the single-chip microcomputer 1 is respectively connected to the input end of the programmable sine wave generator 2 and the input end of the digital potentiometer 3, and the output end of the programmable sine wave generator 2 and the output end of the digital potentiometer 3 are respectively connected to the comparator 4, the output terminal of the comparator 4 is connected to the input terminal of the optocoupler 5, the output terminal of the optocoupler 5 is connected to the input terminal of the triode 9, the output terminal of the triode 9 is connected to the DC power supply 10, and the DC power supply 10 is connected to the current limiting resistor 6 One end of the current limiting resistor 6 is connected to the processing positive pole 7, and the processing positive pole 7 is connected to the triode 9 through the processing negative pole 8.

The single-chip microcomputer 1 controls the digital potentiometer 3 to provide a stable reference voltage for the high-speed comparator, and the single-chip microcomputer controls the programmable sine wave generator 2 to generate a sine wave signal of the required frequency, and the signal is intercepted after passing through the high-speed comparator 4 It becomes a pulse signal. After being isolated by the high-speed optocoupler 5, it controls the conduction and closing of the triode, and the DC power supply 10 provides voltage. After the current is limited by the current limiting resistor 6, nanometers will be generated between the processing positive electrode 7 and the processing negative electrode 8. Second-level processing pulses.

Provide the using method of the present utility model below:

1. By programming the microcontroller 1, program the programmable sine wave generator 2 and digital potentiometer 3 according to the required frequency and pulse width to generate the sine wave and reference voltage of the frequency required by the comparator 4 (this The steps can also be controlled by the host computer, that is, input parameters in the host computer and transmit them to the single-chip microcomputer through serial communication, etc.).

2. The sine wave signal passes through the comparator 4, and the signal is intercepted to become a nanosecond pulse required for electrochemical processing.

3. The nanosecond-level pulse signal is photoelectrically isolated through the optocoupler 5 .

4. After the driving signal is isolated, it directly drives the triode 9 to control the processing circuit.

5. The DC power supply 10 generates processing pulses under the control of the triode 9, and after passing through the current limiting resistor 6, it reaches the processing positive electrode 7 and the processing negative electrode 8 to complete the processing.

Claims (1)

1. the nanosecond width pulse power supply for electro-chemical machining, it is characterised in that be provided with single-chip microcomputer, sine wave able to programme Generator, digital regulation resistance, comparator, optocoupler, current-limiting resistance, processing positive pole, processing negative pole, audion and DC source；

The output port of described single-chip microcomputer connects the input of sine-wave generator able to programme and the input of digital regulation resistance respectively, can The outfan of programming sine-wave generator and the outfan of digital regulation resistance connect the input of comparator, the outfan of comparator respectively Connect the input of optocoupler, the input of the output termination audion of optocoupler, the output termination DC source of audion, DC source Connecing one end of current-limiting resistance, another termination processing positive pole of current-limiting resistance, the processing processed negative pole of positive pole is connected with audion.