CN109894691B - composite pulse power supply for ultrasonic electric spark machining - Google Patents
composite pulse power supply for ultrasonic electric spark machining Download PDFInfo
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- CN109894691B CN109894691B CN201910255339.9A CN201910255339A CN109894691B CN 109894691 B CN109894691 B CN 109894691B CN 201910255339 A CN201910255339 A CN 201910255339A CN 109894691 B CN109894691 B CN 109894691B
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Abstract
The invention relates to a power supply technology for ultrasonic electric spark machining, in particular to a composite pulse power supply for ultrasonic electric spark machining. The invention solves the problems that the existing power supply technology for ultrasonic electric spark machining can not ensure that the spark discharge pulse frequency and the ultrasonic vibration pulse frequency are synchronous in the ultrasonic electric spark machining process and can not lock the phase difference between the spark discharge pulse and the ultrasonic vibration pulse. A composite pulse power supply for ultrasonic electric spark machining comprises a main circuit and a control circuit; the main circuit comprises a spark discharge pulse generating circuit and an ultrasonic vibration pulse generating circuit; the spark discharge pulse generating circuit comprises a first rectifying and filtering module, a first direct current chopping module and a first voltage regulating and discharging module; the ultrasonic vibration pulse generating circuit comprises a second rectifying and filtering module, a second direct current chopping module, an inversion module and a second voltage regulating and discharging module. The invention is suitable for ultrasonic electric spark machining.
Description
Technical Field
the invention relates to a power supply technology for ultrasonic electric spark machining, in particular to a composite pulse power supply for ultrasonic electric spark machining.
Background
with the rapid development of industries such as mold manufacturing, aerospace, engineering machinery and the like, the application requirements of high-performance and difficult-to-machine materials such as ceramics, composite materials, hard alloys and the like and precision ultra-precision machining technology thereof are continuously increased, and ultrasonic electric spark machining is more and more favored by people as one of special and precision machining technology. Under the prior art, the ultrasonic electric spark machining generally adopts two sets of power supplies to supply power respectively (one set of power supply supplies power to the discharge gap independently, and the other set of power supply supplies power to the ultrasonic transducer independently). However, due to the principle of the power supply technology, on one hand, the synchronization between the spark discharge pulse frequency and the ultrasonic vibration pulse frequency in the ultrasonic electric discharge machining process cannot be ensured, and on the other hand, the phase difference between the spark discharge pulse and the ultrasonic vibration pulse cannot be locked, so that the machining efficiency is low and the machining quality is poor. Therefore, a brand new power supply is needed to be invented to solve the problems that the existing power supply technology for ultrasonic electric spark machining cannot ensure that the spark discharge pulse frequency and the ultrasonic vibration pulse frequency are synchronous in the ultrasonic electric spark machining process, and cannot lock the phase difference between the spark discharge pulse and the ultrasonic vibration pulse.
disclosure of Invention
The invention provides a composite pulse power supply for ultrasonic electric spark machining, aiming at solving the problems that the existing power supply technology for ultrasonic electric spark machining cannot ensure that the spark discharge pulse frequency and the ultrasonic vibration pulse frequency are synchronous in the ultrasonic electric spark machining process and cannot lock the phase difference between the spark discharge pulse and the ultrasonic vibration pulse.
the invention is realized by adopting the following technical scheme:
A composite pulse power supply for ultrasonic electric spark machining comprises a main circuit and a control circuit;
the main circuit comprises a spark discharge pulse generating circuit and an ultrasonic vibration pulse generating circuit;
the spark discharge pulse generating circuit comprises a first rectifying and filtering module, a first direct current chopping module and a first voltage regulating and discharging module;
the first rectifying and filtering module comprises a three-phase bridge rectifying circuit consisting of first to sixth diodes and a first capacitor;
the first direct current chopping module comprises first to fourth triodes;
the first voltage-regulating discharge module comprises a pulse transformer, seventh to twelfth polar tubes, a fifth triode, a sixth triode, a second capacitor, a third capacitor and a discharge gap between a tool electrode and a workpiece;
Three input ends of the three-phase bridge rectifier circuit are respectively connected with a first phase line, a second phase line and a third phase line of a three-phase alternating current power supply; two ends of the first capacitor are respectively connected with the positive output end and the negative output end of the three-phase bridge rectifier circuit;
the collector of the first triode and the collector of the third triode are both connected with the positive output end of the three-phase bridge rectifier circuit; the collector of the second triode is connected with the emitter of the first triode; the collector of the fourth triode is connected with the emitter of the third triode; an emitting electrode of the second triode and an emitting electrode of the fourth triode are both connected with the negative output end of the three-phase bridge rectifier circuit;
two ends of a primary coil of the pulse transformer are respectively connected with an emitting electrode of the first triode and an emitting electrode of the third triode; the number of secondary coils of the pulse transformer is two, and the number of turns of the first secondary coil is greater than that of the second secondary coil; two ends of a first secondary coil of the pulse transformer are respectively connected with the anode of the seventh diode and the cathode of the eighth diode; the cathode of the seventh diode is connected with the collector of the fifth triode; two ends of a second secondary coil of the pulse transformer are respectively connected with the anode of a ninth diode and the cathode of a twelfth diode; the cathode of the ninth diode is connected with the collector of the sixth triode; an emitting electrode of the fifth triode and an emitting electrode of the sixth triode are both connected with a wiring terminal of the tool electrode; the anode of the eighth diode and the anode of the twelfth diode are both connected with the wiring terminal of the workpiece; two ends of the second capacitor are respectively connected with an emitting electrode of the fifth triode and an anode of the eighth diode; two ends of the third capacitor are respectively connected with an emitting electrode of the sixth triode and an anode of the twelfth triode;
The ultrasonic vibration pulse generating circuit comprises a second rectifying and filtering module, a second direct current chopping module, an inversion module and a second voltage regulating and discharging module;
The second rectifying and filtering module comprises a single-phase full-wave rectifying circuit consisting of eleventh to fourteenth diodes and a fourth capacitor;
The second direct-current chopping module comprises a seventh triode, a fifteenth diode and a first inductor;
the inversion module comprises eighth to eleventh triodes, sixteenth to nineteenth diodes and fifth to eighth capacitors;
the second voltage regulating and discharging module comprises a high-frequency transformer, a first resistor and an ultrasonic transducer;
two input ends of the single-phase full-wave rectification circuit are respectively connected with a third phase line and a neutral line of the three-phase alternating-current power supply; two ends of the fourth capacitor are respectively connected with the positive output end and the negative output end of the single-phase full-wave rectification circuit;
the collector of the seventh triode is connected with the positive output end of the single-phase full-wave rectification circuit; the cathode of the fifteenth diode is connected with the emitter of the seventh triode; the anode of the fifteenth diode is connected with the negative output end of the single-phase full-wave rectification circuit;
the collector electrode of the eighth triode and the collector electrode of the thirteenth triode are both connected with the emitter electrode of the seventh triode through the first inductor; the collector of the ninth triode is connected with the emitter of the eighth triode; the collector of the eleventh triode is connected with the emitter of the thirteenth triode; an emitting electrode of the ninth triode and an emitting electrode of the eleventh triode are both connected with the negative output end of the single-phase full-wave rectification circuit; the cathode of the sixteenth diode is connected with the collector of the eighth triode; the anode of the sixteenth diode is connected with the emitting electrode of the eighth triode; the cathode of the seventeenth diode is connected with the collector of the ninth triode; the anode of the seventeenth diode is connected with the emitter of the ninth triode; the cathode of the eighteenth diode is connected with the collector of the thirteenth diode; the anode of the eighteenth diode is connected with the emitter of the thirteenth diode; the cathode of the nineteenth diode is connected with the collector of the eleventh triode; the anode of the nineteenth diode is connected with the emitting electrode of the eleventh triode; two ends of the fifth capacitor are respectively connected with a collector and an emitter of the eighth triode; two ends of the sixth capacitor are respectively connected with a collector and an emitter of the ninth triode; two ends of the seventh capacitor are respectively connected with a collector and an emitter of the thirteenth polar tube; two ends of the eighth capacitor are respectively connected with a collector and an emitter of the eleventh triode;
two ends of a primary coil of the high-frequency transformer are respectively connected with an emitter of the eighth triode and an emitter of the thirteenth triode; one end of a secondary coil of the high-frequency transformer is connected with one end of the ultrasonic transducer through a first resistor, and the other end of the secondary coil of the high-frequency transformer is connected with the other end of the ultrasonic transducer;
The control circuit comprises a current sensor, a Schmitt trigger, a phase inverter, a frequency preset counter, a PWM (pulse-width modulation) modulation circuit, a phase-locked circuit, a frequency selection circuit, a first driving circuit, a second driving circuit and a pulse generator;
The current sensor is arranged on a terminal of the workpiece; the output end of the current sensor is respectively connected with the input end of the Schmitt trigger and the first input end of the PWM modulation circuit; the output end of the Schmitt trigger is respectively connected with the input end of the phase inverter and the base electrode of the sixth triode; the output end of the phase inverter is connected with the base electrode of the fifth triode; the output end of the frequency preset counter is connected with the second input end of the PWM modulation circuit; the output end of the PWM modulation circuit is connected with the input end of the phase-locked circuit; the output end of the phase-locked circuit is respectively connected with the input end of the frequency selection circuit and the input end of the first driving circuit; the output end of the frequency selection circuit is connected with the input end of the second driving circuit; the output end of the first driving circuit is respectively connected with the base electrode of the first triode, the base electrode of the second triode, the base electrode of the third triode and the base electrode of the fourth triode; the output end of the second driving circuit is respectively connected with the base electrode of the eighth triode, the base electrode of the ninth triode, the base electrode of the thirteenth triode and the base electrode of the eleventh triode; the output end of the pulse generator is connected with the base electrode of the seventh triode.
the specific working process is as follows: firstly, the working process of a main circuit: the three-phase alternating current is rectified and filtered by the first rectifying and filtering module, and then is converted into pulse direct current with adjustable duty ratio by the first direct current chopping module, and the pulse direct current is applied to a primary coil of the pulse transformer, so that a first secondary coil of the pulse transformer generates high-voltage pulse direct current, and a second secondary coil generates low-voltage pulse direct current. In the process, the current sensor measures the current of the terminal of the workpiece in real time, and the measured current value is used as a feedback control signal of the Schmitt trigger and the PWM modulation circuit. In the period of the pulse wave output by the PWM modulation circuit, when the discharge gap is not broken down, the current value measured by the current sensor is zero, at the moment, the Schmitt trigger outputs a low level, the phase inverter outputs a high level, the fifth triode is conducted, the sixth triode is cut off, and the high-voltage pulse direct current is filtered by the second capacitor and the third capacitor and then applied to the discharge gap, so that the discharge gap generates high-voltage electric pulses, and the discharge gap is quickly broken down. When the discharge gap is broken down, the current value measured by the current sensor is larger, the Schmitt trigger outputs high level, the inverter outputs low level, the fifth triode is cut off, the sixth triode is conducted, low-voltage pulse direct current is filtered by the second capacitor and the third capacitor and then is applied to the discharge gap, so that spark discharge is generated in the discharge gap, the tool electrode carries out erosion machining on the workpiece until the period of pulse wave is over (at the moment, the interpolar dielectric medium is deion, and the discharge gap is restored to an insulation state). If the current value measured by the current sensor exceeds a specified threshold value in the period of the pulse wave, the short circuit of the interpolar is indicated to be about to occur, and the feedback control signal controls the PWM modulation circuit to stop outputting the pulse wave at the moment, so that the workpiece and the tool electrode are prevented from being damaged due to the short circuit of the interpolar. Meanwhile, the single-phase alternating current is applied to a primary coil of the high-frequency transformer after being subjected to rectification filtering, direct-current chopping voltage regulation and inversion sequentially through the second rectification filtering module, the second direct-current chopping module and the inversion module, so that a secondary coil of the high-frequency transformer generates pulse alternating current. The pulse alternating current is applied to the ultrasonic transducer after being subjected to current limiting through the first resistor, so that the ultrasonic transducer generates ultrasonic vibration pulses. Secondly, controlling the working process of the circuit: the frequency preset counter sets the spark discharge pulse frequency and the ultrasonic vibration pulse frequency, sends the set frequency value to the PWM modulation circuit, the PWM modulation circuit outputs the pulse wave with the corresponding frequency and sends the pulse wave to the phase locking circuit, and the phase locking circuit generates a control signal according to the frequency value of the pulse wave and the preset phase difference (the phase difference between the spark discharge pulse and the ultrasonic vibration pulse). The generated control signals are divided into two paths: the first path is applied to the first direct current chopping module through the first driving circuit, so that the frequency of the pulse direct current is controlled, and the frequency of the spark discharge pulse is controlled. The second path is subjected to band-pass filtering through the frequency selection circuit and then applied to the inversion module through the second driving circuit, so that the frequency of the pulse alternating current is controlled, and the ultrasonic vibration pulse frequency is controlled. Through the control, on one hand, the strict synchronization of the spark discharge pulse frequency and the ultrasonic vibration pulse frequency is ensured, and on the other hand, the phase difference between the spark discharge pulse and the ultrasonic vibration pulse is locked. In this process, the pulse generator generates a control signal. The control signal is applied to the second direct current chopping module, thereby regulating the voltage of the pulse alternating current.
Based on the process, compared with the existing power supply technology of ultrasonic electric spark machining, the composite pulse power supply for ultrasonic electric spark machining adopts a brand-new structure and principle, so that on one hand, the strict synchronization of the frequency of the spark discharge pulse and the frequency of the ultrasonic vibration pulse is ensured, and on the other hand, the phase difference between the spark discharge pulse and the ultrasonic vibration pulse is locked, thereby effectively improving the machining efficiency and effectively improving the machining quality.
The ultrasonic electric spark machining device is reasonable in structure and ingenious in design, effectively solves the problems that the existing power supply technology for ultrasonic electric spark machining cannot ensure that the spark discharge pulse frequency and the ultrasonic vibration pulse frequency are synchronous in the ultrasonic electric spark machining process, and cannot lock the phase difference between the spark discharge pulse and the ultrasonic vibration pulse, and is suitable for ultrasonic electric spark machining.
drawings
Fig. 1 is a circuit schematic of the present invention.
Fig. 2 is a circuit schematic diagram of the PWM modulation circuit of the present invention.
fig. 3 is a circuit schematic of the phase lock circuit of the present invention.
fig. 4 is a circuit schematic diagram of the frequency selection circuit of the present invention.
fig. 5 is a schematic circuit diagram of a first driving circuit in the present invention.
Fig. 6 is a circuit schematic of a second drive circuit in the present invention.
Detailed Description
A composite pulse power supply for ultrasonic electric spark machining comprises a main circuit and a control circuit;
the main circuit comprises a spark discharge pulse generating circuit and an ultrasonic vibration pulse generating circuit;
The spark discharge pulse generating circuit comprises a first rectifying and filtering module, a first direct current chopping module and a first voltage regulating and discharging module;
The first rectifying and filtering module comprises a three-phase bridge rectifying circuit consisting of first to sixth diodes VD1 ~ VD6 and a first capacitor C1;
the first direct current chopping module comprises first to fourth triodes VT1 ~ VT 4;
the first voltage-regulating discharging module comprises a pulse transformer T1, seventh to twelfth polar tubes VD7 ~ VD10, a fifth triode VT5, a sixth triode VT6, a second capacitor C2, a third capacitor C3 and a discharging gap H between a tool electrode and a workpiece;
three input ends of the three-phase bridge rectifier circuit are respectively connected with a first phase line U, a second phase line V and a third phase line W of a three-phase alternating current power supply; two ends of the first capacitor C1 are respectively connected with the positive output end and the negative output end of the three-phase bridge rectification circuit;
The collector of the first triode VT1 and the collector of the third triode VT3 are both connected with the positive output end of the three-phase bridge rectification circuit; the collector of the second triode VT2 is connected with the emitter of the first triode VT 1; the collector of the fourth triode VT4 is connected with the emitter of the third triode VT 3; an emitter of the second triode VT2 and an emitter of the fourth triode VT4 are both connected with the negative output end of the three-phase bridge rectification circuit;
two ends of a primary coil of the pulse transformer T1 are respectively connected with an emitter of the first triode VT1 and an emitter of the third triode VT 3; the number of the secondary coils of the pulse transformer T1 is two, and the number of turns of the first secondary coil is greater than that of the second secondary coil; two ends of a first secondary coil of the pulse transformer T1 are respectively connected with an anode of a seventh diode VD7 and a cathode of an eighth diode VD 8; the cathode of the seventh diode VD7 is connected with the collector of the fifth triode VT 5; two ends of a second secondary coil of the pulse transformer T1 are respectively connected with the anode of a ninth diode VD9 and the cathode of a twelfth diode VD 10; the cathode of the ninth diode VD9 is connected to the collector of the sixth transistor VT 6; an emitting electrode of the fifth triode VT5 and an emitting electrode of the sixth triode VT6 are both connected with the wiring terminal of the tool electrode; the anode of the eighth diode VD8 and the anode of the twelfth diode VD10 are both connected with the terminal of the workpiece; two ends of the second capacitor C2 are respectively connected with an emitter of the fifth triode VT5 and an anode of the eighth diode VD 8; two ends of the third capacitor C3 are respectively connected with an emitter of the sixth triode VT6 and an anode of the twelfth triode VD 10;
The ultrasonic vibration pulse generating circuit comprises a second rectifying and filtering module, a second direct current chopping module, an inversion module and a second voltage regulating and discharging module;
The second rectifying and filtering module comprises a single-phase full-wave rectifying circuit consisting of eleventh to fourteenth diodes VD11 ~ VD14 and a fourth capacitor C4;
the second direct current chopping module comprises a seventh triode VT7, a fifteenth diode VD15 and a first inductor L1;
The inverter module comprises eighth to eleventh triodes VT8 ~ VT11, sixteenth to nineteenth diodes VD16 ~ VD19 and fifth to eighth capacitors C5 ~ C8;
the second voltage regulating and discharging module comprises a high-frequency transformer T2, a first resistor R1 and an ultrasonic transducer F;
Two input ends of the single-phase full-wave rectification circuit are respectively connected with a third phase line W and a neutral line N of the three-phase alternating-current power supply; two ends of a fourth capacitor C4 are respectively connected with the positive output end and the negative output end of the single-phase full-wave rectification circuit;
the collector of the seventh triode VT7 is connected with the positive output end of the single-phase full-wave rectification circuit; the cathode of the fifteenth diode VD15 is connected with the emitter of the seventh triode VT 7; the anode of the fifteenth diode VD15 is connected with the negative output end of the single-phase full-wave rectification circuit;
The collector of the eighth triode VT8 and the collector of the thirteenth triode VT10 are both connected with the emitter of the seventh triode VT7 through a first inductor L1; the collector of the ninth triode VT9 is connected with the emitter of the eighth triode VT 8; the collector of the eleventh triode VT11 is connected with the emitter of the thirteenth triode VT 10; an emitting electrode of the ninth triode VT9 and an emitting electrode of the eleventh triode VT11 are both connected with the negative output end of the single-phase full-wave rectification circuit; the cathode of the sixteenth diode VD16 is connected with the collector of the eighth triode VT 8; the anode of the sixteenth diode VD16 is connected to the emitter of the eighth transistor VT 8; the cathode of the seventeenth diode VD17 is connected with the collector of the ninth triode VT 9; the anode of the seventeenth diode VD17 is connected to the emitter of the ninth transistor VT 9; the cathode of the eighteenth diode VD18 is connected to the collector of the thirteenth diode VT 10; the anode of the eighteenth diode VD18 is connected to the emitter of the thirteenth diode VT 10; the cathode of the nineteenth diode VD19 is connected with the collector of the eleventh triode VT 11; the anode of the nineteenth diode VD19 is connected to the emitter of the eleventh transistor VT 11; two ends of the fifth capacitor C5 are respectively connected with the collector and the emitter of the eighth triode VT 8; two ends of the sixth capacitor C6 are respectively connected with the collector and the emitter of the ninth triode VT 9; both ends of the seventh capacitor C7 are connected to the collector and emitter of the thirteenth diode VT10, respectively; two ends of the eighth capacitor C8 are respectively connected with the collector and the emitter of the eleventh triode VT 11;
Two ends of a primary coil of the high-frequency transformer T2 are respectively connected with an emitter of an eighth triode VT8 and an emitter of a thirteenth triode VT 10; one end of a secondary coil of the high-frequency transformer T2 is connected with one end of the ultrasonic transducer F through a first resistor R1, and the other end of the secondary coil is connected with the other end of the ultrasonic transducer F;
the control circuit comprises a current sensor B, a Schmitt trigger K, an inverter S, a frequency preset counter, a PWM (pulse-width modulation) modulation circuit, a phase locking circuit, a frequency selection circuit, a first driving circuit, a second driving circuit and a pulse generator;
The current sensor B is arranged on a terminal of the workpiece; the output end of the current sensor B is respectively connected with the input end of the Schmitt trigger K and the first input end of the PWM circuit; the output end of the Schmitt trigger K is respectively connected with the input end of the inverter S and the base electrode of the sixth triode VT 6; the output end of the inverter S is connected with the base electrode of the fifth triode VT 5; the output end of the frequency preset counter is connected with the second input end of the PWM modulation circuit; the output end of the PWM modulation circuit is connected with the input end of the phase-locked circuit; the output end of the phase-locked circuit is respectively connected with the input end of the frequency selection circuit and the input end of the first driving circuit; the output end of the frequency selection circuit is connected with the input end of the second driving circuit; the output end of the first driving circuit is respectively connected with the base electrode of the first triode VT1, the base electrode of the second triode VT2, the base electrode of the third triode VT3 and the base electrode of the fourth triode VT 4; the output end of the second driving circuit is respectively connected with the base electrode of an eighth triode VT8, the base electrode of a ninth triode VT9, the base electrode of a thirteenth triode VT10 and the base electrode of an eleventh triode VT 11; the output end of the pulse generator is connected with the base of the seventh triode VT 7.
the PWM modulation circuit comprises a 555 timer, a digital comparator, a second resistor R2, a third resistor R3, a ninth capacitor C9, a tenth capacitor C10 and a twentieth diode VD 20; a first pin of the 555 timer is grounded; a second pin of the 555 timer is used as a clock signal end; a third pin of the 555 timer is connected with a first input end of the digital comparator through a third resistor R3; a fourth pin of the 555 timer is connected with a positive power supply terminal VDD on one hand, and is grounded through a second resistor R2 and a ninth capacitor C9 in sequence on the other hand; a fifth pin of the 555 timer is used as a first input end of the PWM modulation circuit; a sixth pin of the 555 timer is grounded through a ninth capacitor C9; a seventh pin of the 555 timer is grounded through a ninth capacitor C9; an eighth pin of the 555 timer is connected with a positive power supply terminal VDD on one hand, and is grounded through a second resistor R2 and a ninth capacitor C9 in sequence on the other hand; a second input end of the digital comparator is used as a second input end of the PWM modulation circuit; the output end of the digital comparator is used as the output end of the PWM modulation circuit; one end of the tenth capacitor C10 is connected with the first input end of the digital comparator, and the other end is grounded; the cathode of the twentieth diode VD20 is connected with the third pin of the 555 timer; the anode of the twentieth diode VD20 is connected to the first input of the digital comparator.
the phase-locked circuit comprises a fuzzy controller, a proportion module, a differential module, an integration module, a phase comparator, a filter and a voltage-controlled oscillator; the input end of the fuzzy controller is used as the input end of the phase-locked circuit; the output end of the fuzzy controller is respectively connected with the input end of the proportion module, the input end of the differential module and the input end of the integral module; the output end of the proportion module, the output end of the differential module and the output end of the integral module are connected with the input end of the phase comparator; the output end of the phase comparator is connected with the input end of the filter; the output end of the filter is connected with the input end of the voltage-controlled oscillator; the output end of the voltage-controlled oscillator is used as the output end of the phase-locked circuit on one hand, and is respectively connected with the input end of the phase comparator and the input end of the fuzzy controller on the other hand.
the frequency selection circuit comprises a CPU, a zero-crossing comparator, a direct digital frequency synthesizer and a transmission module; a first input end of the CPU is used as an input end of the frequency selection circuit; the second input end of the CPU is connected with the output end of the zero-crossing comparator; the output end of the CPU is connected with the input end of the direct digital frequency synthesizer; the output end of the direct digital frequency synthesizer is connected with the input end of the transmission module; the output end of the transmission module is used as the output end of the frequency selection circuit; the CPU is bidirectionally connected with the transmission module; the zero-crossing comparator is bidirectionally connected with the direct digital frequency synthesizer.
The first driving circuit comprises twenty-first to twenty-third diodes VD21 ~ VD23, a twelfth triode VT12 and a fourth resistor R4, one end of the fourth resistor R4 is used as an input end of the first driving circuit, the other end of the fourth resistor R4 is respectively connected with the anode of a twenty-first diode VD21, the anode of a twenty-second diode VD22 and the cathode of a twenty-third diode VD23, the cathode of the twenty-first diode VD21 is connected with the collector of the twelfth triode VT12, the cathode of the twenty-second diode VD22 and the anode of a twenty-third diode VD23 are both connected with the base of the twelfth triode VT12, the collector of the twelfth triode VT12 is connected with a positive power supply end VCC, and the emitter of the twelfth triode VT12 is used as an output end of the first driving circuit.
The second driving circuit comprises twenty-fourth to twenty-sixth diodes VD24 ~ VD26, a thirteenth triode VT13 and a fifth resistor R5, one end of the fifth resistor R5 is used as the input end of the second driving circuit, the other end of the fifth resistor R5 is respectively connected with the anode of a twenty-fourth diode VD24, the anode of a twenty-fifth diode VD25 and the cathode of a twenty-sixth diode VD26, the cathode of the twenty-fourth diode VD24 is connected with the collector of a thirteenth triode VT13, the cathode of the twenty-fifth diode VD25 and the anode of a twenty-sixth diode VD26 are both connected with the base of the thirteenth triode VT13, the collector of the thirteenth triode VT13 is connected with a positive power supply end VCC, and the emitter of the thirteenth triode VT13 is used as the output end of the second driving circuit.
The first to thirteenth transistors VT1 ~ VT13 are NPN transistors.
Claims (6)
1. A composite pulse power supply for ultrasonic electric discharge machining is characterized in that: comprises a main circuit and a control circuit;
the main circuit comprises a spark discharge pulse generating circuit and an ultrasonic vibration pulse generating circuit;
The spark discharge pulse generating circuit comprises a first rectifying and filtering module, a first direct current chopping module and a first voltage regulating and discharging module;
the first rectifying and filtering module comprises a three-phase bridge rectifying circuit consisting of first to sixth diodes (VD 1 ~ VD 6) and a first capacitor (C1);
the first direct current chopping module comprises first to fourth triodes (VT 1 ~ VT 4);
The first voltage-regulating discharging module comprises a pulse transformer (T1), seventh to twelfth polar tubes (VD 7 ~ VD 10), a fifth triode (VT 5), a sixth triode (VT 6), a second capacitor (C2), a third capacitor (C3) and a discharging gap (H) between a tool electrode and a workpiece;
three input ends of the three-phase bridge rectifier circuit are respectively connected with a first phase line (U), a second phase line (V) and a third phase line (W) of a three-phase alternating current power supply; two ends of the first capacitor (C1) are respectively connected with the positive output end and the negative output end of the three-phase bridge rectification circuit;
The collector of the first triode (VT 1) and the collector of the third triode (VT 3) are both connected with the positive output end of the three-phase bridge rectification circuit; the collector of the second triode (VT 2) is connected with the emitter of the first triode (VT 1); the collector of the fourth triode (VT 4) is connected with the emitter of the third triode (VT 3); an emitter of the second triode (VT 2) and an emitter of the fourth triode (VT 4) are both connected with the negative output end of the three-phase bridge rectification circuit;
Two ends of a primary coil of the pulse transformer (T1) are respectively connected with an emitter of the first triode (VT 1) and an emitter of the third triode (VT 3); the number of secondary coils of the pulse transformer (T1) is two, and the number of turns of the first secondary coil is greater than that of the second secondary coil; two ends of a first secondary coil of the pulse transformer (T1) are respectively connected with the anode of a seventh diode (VD 7) and the cathode of an eighth diode (VD 8); the cathode of the seventh diode (VD 7) is connected with the collector of the fifth triode (VT 5); two ends of a second secondary coil of the pulse transformer (T1) are respectively connected with the anode of a ninth diode (VD 9) and the cathode of a twelfth pole tube (VD 10); the cathode of the ninth diode (VD 9) is connected with the collector of the sixth triode (VT 6); the emitter of the fifth triode (VT 5) and the emitter of the sixth triode (VT 6) are both connected with the terminal of the tool electrode; the anode of the eighth diode (VD 8) and the anode of the twelfth diode (VD 10) are connected with the terminal of the workpiece; two ends of the second capacitor (C2) are respectively connected with an emitter of the fifth triode (VT 5) and an anode of the eighth diode (VD 8); two ends of the third capacitor (C3) are respectively connected with an emitter of the sixth triode (VT 6) and an anode of the twelfth triode (VD 10);
the ultrasonic vibration pulse generating circuit comprises a second rectifying and filtering module, a second direct current chopping module, an inversion module and a second voltage regulating and discharging module;
The second rectifying and filtering module comprises a single-phase full-wave rectifying circuit consisting of eleventh to fourteenth diodes (VD 11 ~ VD 14) and a fourth capacitor (C4);
the second direct current chopping module comprises a seventh triode (VT 7), a fifteenth diode (VD 15) and a first inductor (L1);
The inverter module comprises eighth to eleventh triodes (VT 8 ~ VT 11), sixteenth to nineteenth diodes (VD 16 ~ VD 19) and fifth to eighth capacitors (C5 ~ C8);
the second voltage regulating and discharging module comprises a high-frequency transformer (T2), a first resistor (R1) and an ultrasonic transducer (F);
two input ends of the single-phase full-wave rectification circuit are respectively connected with a third phase line (W) and a neutral line (N) of the three-phase alternating-current power supply; two ends of a fourth capacitor (C4) are respectively connected with the positive output end and the negative output end of the single-phase full-wave rectification circuit;
the collector of the seventh triode (VT 7) is connected with the positive output end of the single-phase full-wave rectification circuit; the cathode of the fifteenth diode (VD 15) is connected with the emitter of the seventh triode (VT 7); the anode of the fifteenth diode (VD 15) is connected with the negative output end of the single-phase full-wave rectification circuit;
the collector of the eighth triode (VT 8) and the collector of the thirteenth diode (VT 10) are both connected with the emitter of the seventh triode (VT 7) through a first inductor (L1); the collector of the ninth triode (VT 9) is connected with the emitter of the eighth triode (VT 8); the collector of the eleventh triode (VT 11) is connected with the emitter of the thirteenth diode (VT 10); an emitter of the ninth triode (VT 9) and an emitter of the eleventh triode (VT 11) are both connected with the negative output end of the single-phase full-wave rectification circuit; the cathode of the sixteenth diode (VD 16) is connected with the collector of the eighth triode (VT 8); the anode of the sixteenth diode (VD 16) is connected with the emitter of the eighth triode (VT 8); the cathode of the seventeenth diode (VD 17) is connected with the collector of the ninth triode (VT 9); the anode of the seventeenth diode (VD 17) is connected with the emitter of the ninth triode (VT 9); the cathode of the eighteenth diode (VD 18) is connected with the collector of the thirteenth pole tube (VT 10); the anode of the eighteenth diode (VD 18) is connected to the emitter of the thirteenth diode (VT 10); the cathode of the nineteenth diode (VD 19) is connected with the collector of the eleventh triode (VT 11); the anode of the nineteenth diode (VD 19) is connected with the emitter of the eleventh triode (VT 11); two ends of the fifth capacitor (C5) are respectively connected with the collector and the emitter of the eighth triode (VT 8); two ends of the sixth capacitor (C6) are respectively connected with the collector and the emitter of the ninth triode (VT 9); both ends of the seventh capacitor (C7) are respectively connected with the collector and the emitter of the thirteenth diode (VT 10); both ends of the eighth capacitor (C8) are respectively connected with the collector and the emitter of the eleventh triode (VT 11);
Two ends of a primary coil of the high-frequency transformer (T2) are respectively connected with an emitter of an eighth triode (VT 8) and an emitter of a thirteenth triode (VT 10); one end of a secondary coil of the high-frequency transformer (T2) is connected with one end of the ultrasonic transducer (F) through a first resistor (R1), and the other end of the secondary coil is connected with the other end of the ultrasonic transducer (F);
the control circuit comprises a current sensor (B), a Schmidt trigger (K), an inverter (S), a frequency preset counter, a PWM (pulse-width modulation) circuit, a phase-locked circuit, a frequency selection circuit, a first driving circuit, a second driving circuit and a pulse generator;
The current sensor (B) is arranged on a terminal of the workpiece; the output end of the current sensor (B) is respectively connected with the input end of the Schmitt trigger (K) and the first input end of the PWM modulation circuit; the output end of the Schmitt trigger (K) is respectively connected with the input end of the inverter (S) and the base electrode of the sixth triode (VT 6); the output end of the inverter (S) is connected with the base electrode of the fifth triode (VT 5); the output end of the frequency preset counter is connected with the second input end of the PWM modulation circuit; the output end of the PWM modulation circuit is connected with the input end of the phase-locked circuit; the output end of the phase-locked circuit is respectively connected with the input end of the frequency selection circuit and the input end of the first driving circuit; the output end of the frequency selection circuit is connected with the input end of the second driving circuit; the output end of the first driving circuit is respectively connected with the base electrode of the first triode (VT 1), the base electrode of the second triode (VT 2), the base electrode of the third triode (VT 3) and the base electrode of the fourth triode (VT 4); the output end of the second driving circuit is respectively connected with the base electrode of an eighth triode (VT 8), the base electrode of a ninth triode (VT 9), the base electrode of a thirteenth triode (VT 10) and the base electrode of an eleventh triode (VT 11); the output end of the pulse generator is connected with the base of a seventh triode (VT 7).
2. the composite pulse power supply for ultrasonic electric discharge machining according to claim 1, characterized in that: the PWM modulation circuit comprises a 555 timer, a digital comparator, a second resistor (R2), a third resistor (R3), a ninth capacitor (C9), a tenth capacitor (C10) and a twentieth diode (VD 20); a first pin of the 555 timer is grounded; a second pin of the 555 timer is used as a clock signal end; a third pin of the 555 timer is connected with a first input end of the digital comparator through a third resistor (R3); a fourth pin of the 555 timer is connected with a positive power supply terminal (VDD) on one hand, and is grounded through a second resistor (R2) and a ninth capacitor (C9) in sequence on the other hand; a fifth pin of the 555 timer is used as a first input end of the PWM modulation circuit; a sixth pin of the 555 timer is grounded through a ninth capacitor (C9); a seventh pin of the 555 timer is grounded through a ninth capacitor (C9); an eighth pin of the 555 timer is connected with a positive power supply terminal (VDD) on one hand, and is grounded through a second resistor (R2) and a ninth capacitor (C9) in sequence on the other hand; a second input end of the digital comparator is used as a second input end of the PWM modulation circuit; the output end of the digital comparator is used as the output end of the PWM modulation circuit; one end of a tenth capacitor (C10) is connected with the first input end of the digital comparator, and the other end of the tenth capacitor is grounded; the cathode of the twentieth diode (VD 20) is connected with the third pin of the 555 timer; the anode of the twentieth diode (VD 20) is connected to the first input of the digital comparator.
3. the composite pulse power supply for ultrasonic electric discharge machining according to claim 1, characterized in that: the phase-locked circuit comprises a fuzzy controller, a proportion module, a differential module, an integration module, a phase comparator, a filter and a voltage-controlled oscillator; the input end of the fuzzy controller is used as the input end of the phase-locked circuit; the output end of the fuzzy controller is respectively connected with the input end of the proportion module, the input end of the differential module and the input end of the integral module; the output end of the proportion module, the output end of the differential module and the output end of the integral module are connected with the input end of the phase comparator; the output end of the phase comparator is connected with the input end of the filter; the output end of the filter is connected with the input end of the voltage-controlled oscillator; the output end of the voltage-controlled oscillator is used as the output end of the phase-locked circuit on one hand, and is respectively connected with the input end of the phase comparator and the input end of the fuzzy controller on the other hand.
4. the composite pulse power supply for ultrasonic electric discharge machining according to claim 1, characterized in that: the frequency selection circuit comprises a CPU, a zero-crossing comparator, a direct digital frequency synthesizer and a transmission module; a first input end of the CPU is used as an input end of the frequency selection circuit; the second input end of the CPU is connected with the output end of the zero-crossing comparator; the output end of the CPU is connected with the input end of the direct digital frequency synthesizer; the output end of the direct digital frequency synthesizer is connected with the input end of the transmission module; the output end of the transmission module is used as the output end of the frequency selection circuit; the CPU is bidirectionally connected with the transmission module; the zero-crossing comparator is bidirectionally connected with the direct digital frequency synthesizer.
5. The composite pulse power supply for ultrasonic electric discharge machining according to claim 1, wherein the first driving circuit comprises twenty-first to twenty-third diodes (VD 21 ~ VD 23), a twelfth triode (VT 12) and a fourth resistor (R4), one end of the fourth resistor (R4) is used as an input end of the first driving circuit, and the other end of the fourth resistor (R4) is respectively connected with an anode of the twenty-first diode (VD 21), an anode of the twenty-second diode (VD 22) and a cathode of the twenty-third diode (VD 23), a cathode of the twenty-first diode (VD 21) is connected with a collector of the twelfth triode (VT 12), a cathode of the twenty-second diode (VD 22) and an anode of the twenty-third diode (VD 23) are both connected with a base of the twelfth triode (VT 12), a collector of the twelfth triode (VT 12) is connected with a positive power supply end (VCC), and an emitter of the twelfth triode (VT 12) is used as an output end of the first driving circuit.
6. The composite pulse power supply for ultrasonic electric discharge machining according to claim 1, wherein the second driving circuit comprises twenty-fourth to twenty-sixth diodes (VD 24 ~ VD 26), a thirteenth triode (VT 13) and a fifth resistor (R5), one end of the fifth resistor (R5) is used as an input end of the second driving circuit, and the other end of the fifth resistor is respectively connected with an anode of the twenty-fourth diode (VD 24), an anode of the twenty-fifth diode (VD 25) and a cathode of the twenty-sixth diode (VD 26), a cathode of the twenty-fourth diode (VD 24) is connected with a collector of the thirteenth triode (VT 13), a cathode of the twenty-fifth diode (VD 25) and an anode of the twenty-sixth diode (VD 26) are both connected with a base of the thirteenth triode (VT 13), a collector of the thirteenth triode (VT 13) is connected with a positive power supply end (VCC), and an emitter of the thirteenth triode (VT 13) is used as an output end of the second driving circuit.
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| CN110315153B (en) * | 2019-07-01 | 2020-08-14 | 中国石油大学(华东) | Low-loss energy-saving electric spark forming processing power supply |
| CN110233577B (en) * | 2019-07-02 | 2024-04-09 | 中国电子科技集团公司第四十三研究所 | Controllable high-voltage power pulse generation circuit and control method |
| CN110814448B (en) * | 2019-11-25 | 2020-08-25 | 合肥工业大学 | Centralized rectification and voltage transformation distributed chopping pulse power supply |
| CN110977066A (en) * | 2019-11-25 | 2020-04-10 | 合肥工业大学 | Multichannel parallel trigger type high-frequency pulse power supply |
| CN111014855B (en) * | 2019-12-30 | 2021-10-12 | 扬州大学 | Parameter control module of ultrasonic composite electromachining system |
| CN115383261A (en) * | 2022-09-14 | 2022-11-25 | 新疆大学 | Special power supply for efficient low-voltage micro-arc machining and control method |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2248118Y (en) * | 1995-11-28 | 1997-02-26 | 宣浩 | Phase-locked frequency tracking ultrasonic polishing machine |
| US5656925A (en) * | 1996-01-22 | 1997-08-12 | Juno Lighting, Inc. | Pulse switching tandem flyback voltage converter |
| CN2353476Y (en) * | 1998-11-26 | 1999-12-15 | 山东工业大学 | Novel synchronous impulse power-supply |
| CN101710787B (en) * | 2009-09-29 | 2012-05-30 | 中北大学 | Generation method and device of sine wave heavy current |
| CN103394778B (en) * | 2013-07-26 | 2015-12-02 | 哈尔滨工业大学深圳研究生院 | Two-way narrow spaces micro-energy impulsing power source is modulated in a kind of ultrasonic vibration |
| CN104646775B (en) * | 2015-02-04 | 2017-05-24 | 哈尔滨工业大学深圳研究生院 | Energy-saving type EDM (Electrical Discharge Machining) pulse power supply |
| CN104811055B (en) * | 2015-04-22 | 2017-08-25 | 华南理工大学 | Large-power broadband ultrasonic power and its control method based on silicon carbide device |
| CN204761297U (en) * | 2015-04-22 | 2015-11-11 | 华南理工大学 | High -power broadband ultrasonic power supply based on carborundum device |
| CN106964853B (en) * | 2017-03-06 | 2018-11-20 | 浙江师范大学 | A kind of composite pulse power supply for electro-discharge machining |
| CN107026482A (en) * | 2017-05-05 | 2017-08-08 | 宁波大红鹰学院 | The many level magnetic coupling radio energy transmission systems of single-phase electricity flow pattern |
| DE112018002648B4 (en) * | 2017-05-23 | 2024-10-24 | Mitsubishi Electric Corporation | POWER SUPPLY DEVICE FOR A SPARK EROSION MACHINE, SPARK EROSION DEVICE AND SPARK EROSION PROCESS |
| CN207952846U (en) * | 2018-01-12 | 2018-10-12 | 西南交通大学 | A kind of numerical control electric spark pulse power |
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