CN102909444B - Pulsed power supply with parallel high-energy capacitors for electrosparking - Google Patents
Pulsed power supply with parallel high-energy capacitors for electrosparking Download PDFInfo
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- CN102909444B CN102909444B CN201210391990.7A CN201210391990A CN102909444B CN 102909444 B CN102909444 B CN 102909444B CN 201210391990 A CN201210391990 A CN 201210391990A CN 102909444 B CN102909444 B CN 102909444B
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Abstract
The invention relates to a pulsed power supply for electrosparking in the machining field, in particular to a pulsed power supply with parallel high-energy capacitors for the electrosparking. The power supply comprises a rectification circuit (1), a power factor correction circuit (2), a voltage regulator circuit (3), a high-energy capacitor charge and discharge circuit (4), a voltage and current detection circuit (6), a machining control module circuit (7) and a PWM (Pulse-Width Modulation) control circuit (8). The pulsed power supply can provide approximately 150 V no-load breakdown voltages and 100-500 J discharge energy for an electrical discharge machining gap (5) in a single discharge process. The power supply adopts an accumulator structure, the parallel large-capacity capacitors are charged and discharged independently; the high energy stored in the capacitors is directly released to a discharge gap without passing through a current-limiting resistor, so that high instantaneous discharge energy and a strong discharge explosive force can be achieved; the power supply is applicable to difficult-to-machine materials such as ceramics and polycrystalline diamonds in the machining engineering; the current-limiting resistor with serious energy consumption is removed thoroughly; and the utilization rate of electrical energy can be increased by 2-3 times.
Description
Technical field
The present invention relates to the electric spark working pulse power source in a kind of field of machining.
Background technology
The pulse power is an important component part in EDM System, and the height of its performance directly affects the speed of spark machined, precision, efficiency, stability and reliability etc.Electric spark working pulse power source kind is a lot, traditional pulse power supply is series limiting resistor in electric discharge major loop, make the utilization rate of electrical of the pulse power lower than 25%, nearly the electric energy of 75% with the form consumption of heat on current-limiting resistance, both reduced utilization rate of electrical, again the cooling system of power supply and the service behaviour of electronic devices and components were had higher requirement.Along with the development of Power Electronic Technique and the appearance of high power device, domestic and international scientific worker improves the topological structure of traditional electric spark working pulse power source major loop and control strategy, have developed contravariant, high-low pressure combined type, two-layer configuration current mode and mode of resonance isopulse power supply, resistance current limliting is replaced with inductance, capacitance current-limiting, replace Industrial Frequency Transformer with high-frequency pulse transformer, make the utilization rate of electrical of the pulse power obtain larger raising.
The difficult-to-machine material such as engineering ceramics, polycrystalline diamond mostly to rely on inner conductive network to carry out delivered current carrying out electrical spark working man-hour, there is the features such as the high and thermal conductivity of poorly conductive, fusing point is good, adopt common spark pulse power hardness ag(e)ing rate low, energy consumption is high, Uniform discharge is poor, processing effect is difficult to reach instructions for use, and therefore this kind of difficult-to-machine material needs the special pulse power carrying out electrical spark working man-hour.
Summary of the invention
The object of the present invention is to provide a kind of parallel high-energy electric capacity electric spark working pulse power source, power acquisition accumulator structure and the independent discharge and recharge separately of parallel multiplex large bulk capacitance, the high-energy that electric capacity stores directly is released to discharging gap without current-limiting resistance, high instantaneous discharge energy and strong discharge with explosion can be produced, be applicable to the difficult-to-machine materials such as process engineering pottery, polycrystalline diamond, completely abolished the current-limiting resistance that power consumption is serious, utilization rate of electrical obtains and increases substantially.
Principle of the present invention is: the high-energy electric capacity electric spark working pulse power source in parallel invented is primarily of the composition such as rectification circuit 1, circuit of power factor correction 2, voltage regulator circuit 3, high-energy capacitor charge and discharge circuit 4, voltage and current detection circuit 6, machining control modular circuit 7, pwm control circuit 8.Spark discharge adds man-hour this pulse power and is connected with workpiece with instrument, and the energy that electric discharge removal added required for man-hour is provided by high-energy capacitor charge and discharge circuit 4; Voltage and current detection circuit 6 send machining control modular circuit 7 to detected voltage, current signal; Machining control modular circuit 7 is being carried out on the basis of analyzing and processing to received voltage, current signal, and a road direction high-energy capacitor charge and discharge circuit 4 transmits control signal control gate pole cut-off crystal brake tube (Q
6, Q
7, Q
8, Q
9) open shutoff order, another road direction pwm control circuit 8 transmits control signal, pwm control circuit 8 is according to the signal of received machining control modular circuit 7 and voltage regulator circuit 3, send corresponding control command to voltage regulator circuit 3, make voltage regulator circuit 3 export suitable voltage to high-energy capacitor charge and discharge circuit 4.
The work period of high-energy electric capacity electric spark working pulse power source in parallel invented can be divided into four-stage: (1) electric capacity (C
5) electric discharge, electric capacity (C
4) charging: machining control modular circuit 7 sends control signal, first shutoff door pole cut-off crystal brake tube (Q
7), make electric capacity (C
5) disconnect with voltage regulator circuit 3, then open gate level turn-off thyristor (Q
9), electric capacity (C
5) in the energy that stores be quickly released in electro discharge machining gapping place 5, simultaneously shutoff door pole cut-off crystal brake tube (Q
8)and open gate level turn-off thyristor (Q
6), make voltage regulator circuit 3 couples of electric capacity (C
4) charge; (2) electric capacity (C
5) discharge off, electric capacity (C
4) continue charging: electric capacity (C
5) in store fault offset complete to electro discharge machining gapping place, voltage and current detection circuit 6 send the voltage detected, current signal to machining control modular circuit 7, machining control modular circuit 7 sends control signal, shutoff door pole cut-off crystal brake tube (Q
9), machining gap carries out deionization, now gate level turn-off thyristor (Q
6) continue to open as electric capacity (C
4) charging, electric capacity (C
4) in energy continue increase, gate level turn-off thyristor (Q
7, Q
8) be continuously off state; (3) electric capacity (C
4) electric discharge, electric capacity (C
5) charging: electric capacity (C
4) charge complete, electro discharge machining gapping place 5 fully deionization, machining control modular circuit 7 sends control signal, shutoff door pole cut-off crystal brake tube (Q
6), electric capacity (C4) and voltage regulator circuit 3 are disconnected, then opens gate level turn-off thyristor (Q
8), the energy stored in electric capacity (C4) is quickly released in electro discharge machining gapping place 5, opens gate level turn-off thyristor (Q7) simultaneously, makes accumulator 4 couples of electric capacity (C
5) charge, gate level turn-off thyristor (Q
9) be continuously off state; (4) electric capacity (C
4) discharge off, electric capacity (C
5) continue charging: electric capacity (C
4) in store fault offset complete to electro discharge machining gapping place, voltage and current detection circuit 6 send the voltage detected, current signal to machining control modular circuit 7, machining control modular circuit 7 sends control signal, shutoff door pole cut-off crystal brake tube (Q
8), machining gap carries out deionization, now gate level turn-off thyristor (Q
7) continue to open as electric capacity (C
5) charging, electric capacity (C
5) in energy continue increase, gate level turn-off thyristor (Q
6, Q
9) be continuously off state.Next stage electric capacity C
5discharge capacity C
4charging, power supply enters the next work period, and go on so circularly, the pulse power of the present invention just achieves charge and discharge capacitance (C
4, C
5) in store high-energy be directly released in machining gap without current-limiting resistance, produce high instantaneous discharge energy and strong discharge with explosion, and the current-limiting resistance eliminated in traditional spark pulse power, achieves the object of energy-efficient electric discharge difficult processing rapidoprint preferably.
The present invention's tool compared with electric spark working pulse power source conventional at present has the following advantages:
1. the high-energy stored in charge and discharge capacitance is directly released to discharging gap without current-limiting resistance, can produce high instantaneous discharge energy and strong discharge with explosion, and during the difficult-to-machine materials such as process engineering pottery and polycrystalline diamond, efficiency can improve 3-5 doubly.
2. eliminate the current-limiting resistance that power consumption is serious, utilization rate of electrical can improve 2-3 doubly.
3. adopt PFC, can harmonic pollution be reduced.
4., owing to eliminating the high-power current-limiting resistance in traditional spark pulse power, therefore effectively reduce the influence because of electronic devices and components in resistance heating paired pulses power supply, improve the functional reliability of the pulse power.
5. there is good Electro Magnetic Compatibility.
Accompanying drawing explanation
Fig. 1 is high-energy electric capacity electric spark working pulse power source composition frame chart in parallel of the present invention.
Fig. 2 is the electrical block diagram of high-energy electric capacity electric spark working pulse power source in parallel of the present invention.
Designation in upper figure:
Q
1~ Q
5for power switch component, T
1for high-frequency pulse transformer, D
1~ D
4for diode, L
1, L
2for inductance, C
1, C
2for electrochemical capacitor, C
4, C
5for Large Copacity charge and discharge capacitance, Q
6~ Q
9for gate level turn-off thyristor.
Specific embodiments
See Fig. 1.High-energy electric capacity electric spark working pulse power source in parallel of the present invention comprises rectification circuit 1, circuit of power factor correction 2, voltage regulator circuit 3, high-energy capacitor charge and discharge circuit 4, voltage and current detection circuit 6, machining control modular circuit 7, pwm control circuit 8.Rectification circuit 1 becomes alternating current into direct current, flows to circuit of power factor correction 2, carries out PFC; Direct voltage output after correction is to voltage regulator circuit 3; The automatic regulation voltage of control command that voltage regulator circuit 3 sends according to pwm control circuit 8, and flow to high-energy capacitor charge and discharge circuit 4; The control signal that high-energy capacitor charge and discharge circuit 4 sends according to machining control modular circuit 7 provides high discharge energy to electro discharge machining gapping place 5, is used for ablation workpiece material; Voltage and current detection circuit 6 gather the voltage and current signal of discharging gap, flow to machining control modular circuit 7; Machining control modular circuit 7 transmits control signal respectively to high-energy capacitor charge and discharge circuit 4 and pwm control circuit 8 on the basis of received voltage, current signal being carried out to analyzing and processing; Pwm control circuit 8, according to the signal of received machining control modular circuit 7 and voltage regulator circuit 3, adjusts the dutycycle that it exports pulse, and then makes voltage regulator circuit 3 export suitable voltage.
See Fig. 2.In the circuit of high-energy electric capacity electric spark working pulse power source in parallel of the present invention, inductance L
1, power switch component Q
1, diode D
1, electric capacity C
1with pfc controller composition circuit of power factor correction 2, the direct current after rectification is carried out PFC, to reduce the harmonic pollution to electrical network.Power switch component Q
2, Q
3, Q
4, Q
5form full-bridge inverter, produce high-frequency ac square wave under the control signal effect that this full-bridge inverter sends at pwm control circuit 8, and send high-frequency pulse transformer T to
1primary edge, at high-frequency pulse transformer T
1secondary side to produce frequency, phase place identical, the high-frequency ac square wave that amplitude reduces, and send D to
2, D
3form full-wave rectifying circuit, this full-wave rectifying circuit converts high-frequency direct-current square wave to high-frequency ac square wave, flows to by inductance L
2filter circuit with electric capacity C2 is formed, becomes direct current from this filter circuit high-frequency direct-current square wave, electric capacity C
2for jumbo storage capacitor, therefore more stored energy is at electric capacity C
2in, diode D
4continuous current circuit is provided.Gate level turn-off thyristor Q
6, Q
7, Q
8, Q
9according to the control command conducting in certain sequence that machining control modular circuit 7 sends, electric capacity C
4, C
5charging and discharging in turn, electric capacity C during electric discharge
4, C
5middle stored energy is directly released to discharging gap, produces high instantaneous discharge energy and strong discharge with explosion carrys out ablation workpiece material.Voltage detecting circuit 9 is parallel to electro discharge machining gapping place 5 two ends be made up of instrument and workpiece, gathers discharge voltage signal, sends machining control modular circuit 7 to; Current detection circuit 10 is series in electric discharge major loop, gathers discharge current signal, sends machining control modular circuit 7 to; Pfc controller 11 is by controlling power switch component Q
1open and shutoff, make input current follow the change of input voltage, improve power factor.
Claims (2)
1. a high-energy electric capacity electric spark working pulse power source in parallel, it comprises rectification circuit (1), circuit of power factor correction (2), voltage regulator circuit (3), high-energy capacitor charge and discharge circuit (4), voltage and current detection circuit (6), machining control modular circuit (7), pwm control circuit (8), it is characterized in that: voltage regulator circuit (3) is by power switch component (Q
2, Q
3, Q
4, Q
5), high-frequency pulse transformer (T
1), diode (D
2, D
3), fly-wheel diode (D
4), inductance (L
2) and storage capacitor (C
2) composition, high-energy capacitor charge and discharge circuit (4) is by gate level turn-off thyristor (Q
6, Q
7, Q
8, Q
9), charge and discharge capacitance (C
4, C
5) composition; Power switch component (Q
2, Q
3, Q
4, Q
5) form full-bridge inverter, to high-frequency pulse transformer (T under the control signal effect that this full-bridge inverter sends at pwm control circuit (8)
1) primary edge conveying high-frequency pulse voltage, diode (D
2, D
3) form full-wave rectification be connected to transformer (T
1) secondary side, storage capacitor (C
2) be charge and discharge capacitance (C
4, C
5) provide energy, gate level turn-off thyristor (Q
6, Q
7, Q
8, Q
9) the control command conducting in certain sequence that sends according to machining control modular circuit (7), charge and discharge capacitance (C
4, C
5) charging and discharging in turn, the energy stored in electric capacity during electric discharge is directly released to discharging gap without current-limiting resistance.
2. high-energy electric capacity electric spark working pulse power source in parallel as claimed in claim 1, it is characterized in that: rectification circuit (1) exports DC voltage to circuit of power factor correction (2), voltage regulator circuit (3) is exported to after PFC, the automatic regulation output voltage of control command that voltage regulator circuit (3) sends according to pwm control circuit (8) is to high-energy capacitor charge and discharge circuit (4), receive under the control command effect that high-energy capacitor charge and discharge circuit (4) sends in machining control modular circuit (7) and energy in stored voltage regulating circuit (3), and be transported to electro discharge machining gapping place (5), voltage and current detection circuit (6) gather the voltage and current signal of discharging gap, flow to machining control modular circuit (7), machining control modular circuit (7) is to received voltage, the basis that current signal carries out analyzing and processing transmits control signal respectively to pwm control circuit (8) and high-energy capacitor charge and discharge circuit (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210391990.7A CN102909444B (en) | 2012-10-16 | 2012-10-16 | Pulsed power supply with parallel high-energy capacitors for electrosparking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210391990.7A CN102909444B (en) | 2012-10-16 | 2012-10-16 | Pulsed power supply with parallel high-energy capacitors for electrosparking |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102909444A CN102909444A (en) | 2013-02-06 |
| CN102909444B true CN102909444B (en) | 2015-02-18 |
Family
ID=47608155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210391990.7A Active CN102909444B (en) | 2012-10-16 | 2012-10-16 | Pulsed power supply with parallel high-energy capacitors for electrosparking |
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| CN (1) | CN102909444B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2733533T3 (en) * | 2014-08-20 | 2019-11-29 | Agie Charmilles Sa | Procedure and device for shaping pulses for electroerosive machining |
| CN107052481B (en) * | 2017-03-09 | 2019-08-09 | 中国工程物理研究院机械制造工艺研究所 | A kind of high frequency of multi-channel parallel cross-circulation driving is micro- can the electric machining pulse power |
| CN107276405B (en) * | 2017-05-27 | 2019-06-04 | 南京理工大学 | The fine electric spark pulse power and Discrete control method based on the power supply |
| CN111146967B (en) * | 2019-12-25 | 2023-08-15 | 兰州空间技术物理研究所 | High-reliability edge surface breakdown discharge trigger type pulse arc striking power supply |
| CN111293921B (en) * | 2019-12-30 | 2022-09-20 | 南京理工大学 | Adjustable RC (resistor-capacitor) micro pulse power supply based on three-way capacitor staggered discharge |
| CN112378995B (en) * | 2021-01-14 | 2021-04-30 | 矿冶科技集团有限公司 | Electric spark generating device, energy testing device and electric spark generating system |
| CN115360587B (en) * | 2022-09-16 | 2024-02-06 | 湖南泫坤量化科技有限公司 | Electric spark energy measurement method, device and system |
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|---|---|---|---|---|
| US5399826A (en) * | 1991-07-29 | 1995-03-21 | Sodick Co., Ltd. | Electric discharge machining apparatus |
| CN1546266A (en) * | 2003-12-17 | 2004-11-17 | 南京航空航天大学 | Resistance proof current flow type energy-saving electric spark processing impulsing power source with two-stage structure |
| CN1772425A (en) * | 2005-10-24 | 2006-05-17 | 中国石油大学(华东) | Voltage-regulating energy saving spark machining pulse power supply |
| CN201201083Y (en) * | 2008-04-08 | 2009-03-04 | 哈尔滨工业大学 | Duplicate supply mode pulse power source for numerical control electrospark wire-electrode cutting |
| CN201913371U (en) * | 2010-11-16 | 2011-08-03 | 深圳华意隆电气股份有限公司 | Inverter plasma cutting machine with low-energy front guide arc |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0482617A (en) * | 1990-07-26 | 1992-03-16 | I N R Kenkyusho:Kk | Pulse power supply for electrical processing |
-
2012
- 2012-10-16 CN CN201210391990.7A patent/CN102909444B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5399826A (en) * | 1991-07-29 | 1995-03-21 | Sodick Co., Ltd. | Electric discharge machining apparatus |
| CN1546266A (en) * | 2003-12-17 | 2004-11-17 | 南京航空航天大学 | Resistance proof current flow type energy-saving electric spark processing impulsing power source with two-stage structure |
| CN1772425A (en) * | 2005-10-24 | 2006-05-17 | 中国石油大学(华东) | Voltage-regulating energy saving spark machining pulse power supply |
| CN201201083Y (en) * | 2008-04-08 | 2009-03-04 | 哈尔滨工业大学 | Duplicate supply mode pulse power source for numerical control electrospark wire-electrode cutting |
| CN201913371U (en) * | 2010-11-16 | 2011-08-03 | 深圳华意隆电气股份有限公司 | Inverter plasma cutting machine with low-energy front guide arc |
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| CN102909444A (en) | 2013-02-06 |
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