CN103008804A - Direct-current power supply device for electrical cutting - Google Patents
Direct-current power supply device for electrical cutting Download PDFInfo
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- CN103008804A CN103008804A CN2012105356850A CN201210535685A CN103008804A CN 103008804 A CN103008804 A CN 103008804A CN 2012105356850 A CN2012105356850 A CN 2012105356850A CN 201210535685 A CN201210535685 A CN 201210535685A CN 103008804 A CN103008804 A CN 103008804A
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Abstract
The invention relates to a direct-current power supply device for electrical cutting. The direct-current power supply device consists of a main circuit, a DSP (digital signal processing) control circuit and a detection protection circuit, a full bridge circuit is adopted as the main circuit, and the main circuit is used for converting alternating current into direct current to be supplied to a load; and the detection protection circuit is used for detecting the direct-current side of the main circuit, so that signals can be processed correspondingly by the DSP control circuit. The main circuit consists of an input rectification and filtration part, an inverter part and an output rectification and filtration part; wherein the inverter part is used for converting direct current generated by the input rectification and filtration circuit into alternating-current square waves under effects of the DSP control circuit; and the alternating-current square waves are converted into direct-current voltage output after rectification and filtration of the output rectification and filtration part. The inverter part comprises a power electronic switch IGBT (insulated gate bipolar translator) in the full bridge circuit and a resistance-capacitance absorption protection circuit used for preventing damage to the IGBT in turnoff. Since a solid-state electronic circuit is adopted, the whole device is light and flexible. Moreover, cutting can be controlled precisely due to effects of the control circuit.
Description
Technical field
The present invention relates to a kind of electric cutting technology category, more particularly to a kind of continuous-current plant cut for TURP.
Background technology
Electric cutting technology refers in the presence of certain proportion band pressure air-water mixture working media, using the special high-energy short arc discharge group produced between two electrodes come ablation metal or a kind of cutting process of non-metallic conducting material, it belongs to special process industry EDM Technology category, the Technological Economy efficiently solves the ultrahards such as new special conductive material such as cermet, it is superpower, high tenacity, high red hardness, high-wearing feature, the processing problem of serious cold-working hardened material, it is mainly used to the cylindrical of conductive material of the cutting hardness more than HRC45, inner circle, plane, cutting, big pitch, aperture, bevel and other abnormal shapes, processing and forming, form the great-leap-forward development of EDM Technology, it is China's special process（Lathe）Major progress of industry and breakthrough.Because its processing technology can effectively be combined with tradition machinery processing technology, therefore its technique scope of application and highly effective are more obvious, and it is the development to tradition machinery processing technology and supplement.
The core of electric cutting technology is dc source, using workpiece as anode, electric Cutting tool is negative electrode, using certain proportion band pressure air-water mixture as working media between the two poles of the earth, dc source is connected at the two poles of the earth, produces special high-energy short arc discharge group between then two electrodes of starting shooting, discharge current is up to 6000 ~ 10000 amperes, excision just is degraded by continuous as the workpiece of anode, and with the detonation sound.Dc source requirement can continuously produce 6000 ~ 10000 amperes of direct current for a long time, it is impossible to shut down；Because load can be mutated, impact resistance electric current；To maintain accurate cutting size and surface roughness, it is desirable to electric current precise constant, and continuously adjustabe.
Because TURP cuts high to dc source requirement and harsh, either all discomforts such as capacity, durable, stability are used as TURP and cut power supply for solid electronic device and its control circuit, therefore it is all special transformer plus bang-bang circuit that TURP, which cuts power supply, at present, can cut application suitable for TURP reluctantly.But problems and disadvantages are obvious：Special transformer that silicon steel and copper bar make is bulky, preponderance；Bang-bang circuit is unstable, can only Discrete control, it is impossible to continuous adjustment electric current and stabling current, causes the cutting output can not precise control.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of continuous-current plant cut for TURP, its not only small volume, lightweight, and also cutting precision greatly improves.
The continuous-current plant cut for TURP of the present invention, it is characterized in that：It is made up of main circuit, DSP control circuits and detection protection circuit, main circuit is full-bridge circuit, for the direct current for loading convert alternating current for supply；Detect that protection circuit is used for the detection and fault detect for completing the voltage and current to the DC side of main circuit, so that DSP control circuits are handled these signals accordingly.
Main circuit is made up of input rectifying filtering part, inverter section and output rectification filter part；Inverter section in the presence of DSP controls circuit the DC power conversion that produces input rectifying filter circuit into ac square wave；And after output rectification filter partial rectification and filtering, it is changed into direct voltage output.
Inverter section includes the power electronic switching IGBT in the full-bridge circuit and prevents the resistance-capacitance absorption protection circuit that the IGBT is damaged when off.
It is TMS320LF2407A that the DSP, which controls the control core of circuit,.
The present invention is due to using solid state electronic circuitry, and whole device seems light small nimble, and due to controlling the effect of circuit, cutting output is accurately controlled.
Brief description of the drawings
Fig. 1 is the functional block diagram of the continuous-current plant cut for TURP of the present invention.
Fig. 2 is the structure chart of the main circuit of the inversion direct current supply unit cut for TURP of the present invention.
Embodiment
The present invention is described in further detail in conjunction with drawings and Examples.
Referring to Fig. 1 ~ Fig. 2; the technical scheme is that TURP cuts the IGBT inversion direct current power supplys of special DSP control; it is made up of main circuit 1, DSP control circuits 2 and detection protection circuit 3 three part, three-phase 380v convert alternating current is the direct current of supply load, its technical indicator：4000~10000ADC of output current；20~48VDC of floating voltage, 8~20KHZ of reverse frequency.
Detection protection circuit 3 mainly completes the detection and fault detect to DC side and the voltage and current of load-side, so that DSP control circuits 2 are handled these signals accordingly.Wherein, current detecting and voltage detecting to DC side are to provide necessary signal for the protection circuit of system, and when producing excessively stream or overvoltage, the protection signal that protection circuit is produced is after DSP processing; corresponding control signal is sent, so as to protect dc source.Fault detect detects that such as each part overheat, fan are continuously for the auxiliary protection of power supply.
DSP controls circuit 2 using TMS320LF2407A as control core, and a small amount of peripheral circuit is auxiliary, mainly realizes the generation of drive signal, detects the processing of signal, the output of protection signal, with the function such as extraneous communication and man-machine interface.
The topological structure of main circuit 1 is IGBT full-bridge inverter main circuits, is divided into input rectifying filtering part, three parts of inverter section and output rectification filter.
Through power rectifier diode rectification, DC voltage is provided for inverter, is specifically made up of filter capacitor, commutation diode and current-limiting resistance R for input rectifying filtering part, power network input 50HZ, 380VAC alternating currents.
C1, C3 are filter capacitor, and the purpose is to reduce the AC compounent of bus direct current after rectification output.C=(3 ~ 5) T*PIN/Ud2, wherein, T is 1/300 second pulsation period that rectification exports DC voltage, PIN is input power W, and Ud is capacitor average voltage v, such as selects electrochemical capacitor, because capacitor internal resistance is uneven, needed and equalizing resistance R1, R2 per group capacitor.Because series equivalent resistance ESR and series equivalent inductance ESL presence influence filter effect, filter capacitor must also and upper high frequency noninductive polarity free capacitor C2, C4, when main circuit power off, by C2, R1 and C4, R2 is C1, C3 offer discharge loops.
Commutation diode, it is transformer primary side current that selection, which takes rated current I=0.369I1, wherein I1,；Pressure-resistant V=1.414*1.1*Ui=1.414*1.1*380=591v, it is actual to select 2 times of surpluses.
Current-limiting resistance R, input filter inductances current rectifying and wave filtering circuit is when connecting alternating voltage, a series of the problem of being charged to electric capacity, often cause larger surge current, therefore can cause reliabilities, it is necessary to suppressed.Two parts of this programme soft start design point:One is that input line voltage segmentation is started, and when closing a floodgate, first accesses current-limiting resistance R, combined floodgate surge current is limited within setting range, after the full electricity of electric capacity to be entered punching, then by the resistance short circuit；Two be inverter input, output filter capacitor capacity it is larger, if high-power switch tube at once according to nominal load pulsewidth（It is maximum）Conducting, the unexpected foundation that input capacitance is discharged with output voltage with maximum current, it will form very big capacitance current so that over-burden for power switch pipe, it is more likely that burn out switching tube when closing a floodgate.Realized for Part II soft starting circuit by software programming, Part I soft starting circuit is realized by hardware.
Inverter section, power electronic switching IGBT in full-bridge circuit is in the presence of using TMS320LF2407A as the control loop of core, periodic ON/OFF, the DC power conversion that input rectifying filter circuit is produced is into the ac square wave that frequency is 8 ~ 20KHZ, afterwards again through intermediate-frequency transformer reduced output voltage.Output voltage is adjusted using DSP PWM ripples, that is, the dutycycle for changing driving pulse is realized.
IGBT is selected, this is the key core element of inversion direct current power supply, the design, selection to it are directly connected to the safe and reliable of whole power supply.Therefore larger allowance should be left in calculating parameter.
Load voltage value is chosen for：The filtered rear DC voltage maximum UM=√ 2*1.1*U* α=650v of dc bus, wherein, U is line voltage virtual value 380v, and 1.1 be coefficient of variation, and α takes 1.1 for safety coefficient；Crest voltage Us=(UM*1.15+150) * α=987.25v when IGBT is turned off, 1.15 be overvoltage factor, and 150v is peak voltage caused by Ldi/dt, actual to choose 1200v.
The half that average current on the primary side current I1=I2*N2/N1 of intermediate-frequency transformer, every IGBT pipe of full-bridge circuit is I1, the electric current can flow through the sustained ceiling current of pipe when being IGBT conductings（25 DEG C of junction temperature）, you can determine rated current IC.
IGBT resistance-capacitance absorption protection circuits：In order to prevent that IGBT from damaging when off, RCD buffer circuits are used in this programme, it constitutes VD1, R3, C6 as shown in Figure 2, and its effect is that load current is shunted by VD1 to C6 when IGBT is turned off, mitigate IGBT burdens, suppress du/dt and overvoltage.
The design of IGBT drive circuit is extremely important, the Stability and dependability of the system of direct relation.According to driving power and frequency, suitable driver is selected, to meet at following 3 points：Driver can export required frequency.The maximum output voltage of driver is necessarily equal to or more than maximum gate leve voltage.The maximum operation frequency of driver is necessarily equal to or more than the maximum switching frequency of switching tube.This programme uses the special hybrid integrated M579 series IGBT drivers of Mitsubishi.
Output rectification filter part, the ac square-wave voltage of intermediate-frequency transformer output after VD8 rectifications and inductor filter, is changed into direct voltage output again through VD7.
Using all-wave centre cap rectification, its advantage is that the loss of voltage is few, low cost few using diode.
Intermediate-frequency transformer：The effect of intermediate-frequency transformer is voltage current transformation, power transmission and realizes the isolation between input, output, because working frequency is up to 20KHZ, therefore it is required that this magnetic core of transformer material high-frequency loss is as small as possible, in addition more importantly require to avoid magnetic core saturation, therefore operating magnetic field flux density is selected by most severe condition during selection magnetic flux density.Reason is that the saturation of magnetic core means sharply increasing for the exciting current of intermediate-frequency transformer, this obviously can cause the power switch being attached thereto bear great voltage, electric current and damage.Consider requirements above, this programme makees magnetic core of transformer using Fe-Base nanocrystalline soft magnetic material, and its saturation flux density BS is about 1.25T.Operating magnetic field flux B is taken less than 1/3BS, and this programme is full-bridge inverting, so the magnetic flux in magnetic core is alternation, B is also alternation, so Δ B=2B=0.8T.In addition transformer is operated under conditions of low-voltage, high current, and secondary side winding electric current is larger, and wire is thicker, thus selects E-type magnetic core, is easy to coiling.Magnetic core of transformer chooses design formula：SW*SC=P/ (0.53*F* Δ B*J*10-2), SW magnetic core window area CM2, SC magnetic core net sectional area CM2, P output power of power supply W, 0.53 is empirical coefficient, and F takes 3.5A/MM2 for inversion working frequency HZ, J for current in wire density,
Commutation diode, because being high-frequency rectification, selection is fast recovery diode, and it has short reverse recovery time and small reverse recovery current.For unidirectional full-wave rectifying circuit, commutation diode rated current is：IN=2*I2, wherein, I2 is electric power outputting current, and it is 2 side voltage magnitudes of transformer that diode, which bears inverse peak voltage UIN=2*U2, U2,.Output filter capacitor：It can obtain smooth DC current, design formula RL*C >=(3 ~ 8) T.Export direct current reactor：It, which is acted on, two, and one is filtering and energy storage, and two be to improve the dynamic characteristic of power supply, and the rate of climb and peak point current of limiting short-circuit current improve electric cutting ability, preventing power supply from frequently protecting, there is provided cutting precision.Linear reactor is selected when this programme is designed, it has air-gap larger, the unsaturated characteristic in high current.Using bar shaped silicon steel plate core, its is cheap.In order to meet the continuous of output current, the inductance value L of reactor should be met：L >=(U2-U0) * ton/2Imin, L is the inductance value H of direct current reactor, U2 is 2 side voltage magnitude v of transformer, U0 is electric power output voltage v, ton is minimum current unit A (Imin >=0.5 Δ IL) (Δ IL is electric power outputting current 5%) for IGBT maximum ON time μ s, Imin
The performance of this power supply is as follows;
1st, the machine has work/standby.There is output voltage 0-rated value of electric current adjustable when putting work, without output when standby.
2nd, the machine has voltage stabilizing/flow stabilizing function.When putting " voltage stabilizing " state, output voltage is constant in the range of machine rated current, and electric current can make corresponding display according to load；When putting " current stabilization " state, output current is constant in the machine range of nominal tension, and voltage can make corresponding display according to load；" voltage stabilizing " or " current stabilization " shelves are put with specific reference to user's required function.
3rd, comprehensively, with input over-and under-voltage protection, open-phase protection, output short circuit protection, overheat, output overcurrent protection and automatic opening function, IGBT locks protection to main circuit board defencive function.When power supply, which breaks down, to be protected, power supply alarming.
Overvoltage/undervoltage is protected：Three-phase input power supply it is over proof ± 15% when will enter guard mode, be simultaneously emitted by visual alarm equipment without output.
Open-phase protection：Three phase mains will enter guard mode when having one without electric or severe three-phase imbalance, be simultaneously emitted by visual alarm equipment without output.
Overtemperature protection：Power supply overload etc. for a long time, may make internal temperature be increased to normally open contact closure inside more than 85 DEG C, temperature relay; control circuit protection is set to alarm, power supply is in guard mode, is simultaneously emitted by visual alarm; after must now cooling, temperature switch contact disconnects automatic recovery normal work.
Short-circuit protection：When controlling circuit power failure, internal fuse fusing deenergization due to the main circuit short circuit operated or other reasonses are caused, can automatically cut off power supply, make equipment safety immediately.
Overcurrent protection：When electric current output exceedes the 15% of rated current,（That is Iout=Ie × 115%）Power supply can alarm immediately, into guard mode.
4th, driver circuit plate, which has, independently drives, the function such as detection.Detect that this unit is protected in locking when this unit is faulty, other unit normal works is not influenceed, while the unit indicator lamp goes out.
5th, quiet, dynamic property is exported excellent.Dynamic response time is exported below 100 microseconds, therefore high burning voltage or stabling current output, output voltage precision can be obtained（Fluctuation）≤ ± 1%, output current precision（Fluctuation）≤±1%.
6th, extremely strong anti-net pressure interference performance, Width funtion working range：Can be in the case of ± 20% net voltage fluctuation, it is ensured that equipment normal work.
7th, it is advanced to start, stop and defencive function.Advanced soft start and soft stop stop function, fundamentally prevent band load, temporary impact when stopping and be short-circuit, arbitrarily band load can stop, open.The multiple protection functions such as excessively stream, overvoltage, under-voltage, phase shortage, overheat, output short-circuit, it is ensured that equipment long life, energy high stable is operated.
8th, advanced microcomputer remote digital RS485 digital interface control models, can also use microcomputer remote control PLC patterns.This function has the characteristics that：（1）High reliability：By innovative design, using superelevation integrated level, superfast dsp chip, using double MCU system, is greatly reduced component numeral, using high-quality import device, and control circuit uses unique technology, and reliability is greatly improved；（2）High stability：System response speed is fast, has extremely strong adaptability to power network and load change, output accuracy is less than 1%；（3）Parameter automatic Memory：By the parameter automatic Memory set by button, do not lost during power down.Excessively stream, short circuit, overtemperature automatic protection, have character reminding function, failure and position；（4）High degree of automation, can pass through computer or PLC RS232（Or RS485）Standard interface, the power supply realization to production line is automatically controlled.
In a word, this power supply is mainly characterized by：1st, efficiency high, small volume, the 1/4 of only former common power；It is lightweight, the 1/8 of only former common power, so it is moved easily, transports, operates, prevents many occasions from using the situation of electric cutting technology as feasible；2nd, voltage stabilizing, precision of steady current are high；3rd, small is disturbed to power network, ripple is low；4th, reliability is high, there is various kinds of protective circuit；5th, Operation and Maintenance is simple, can remote control.
Claims (10)
1. a kind of continuous-current plant cut for TURP, it is characterized in that：It is made up of main circuit, DSP control circuits and detection protection circuit, main circuit is full-bridge circuit, for the direct current for loading convert alternating current for supply；Detect that protection circuit is used to complete the detection to the DC side of main circuit, so that DSP controls circuit to handle detection signal.
2. the continuous-current plant as claimed in claim 1 cut for TURP, it is characterized in that：Main circuit is made up of input rectifying filtering part, inverter section and output rectification filter part；Inverter section in the presence of DSP controls circuit the DC power conversion that produces input rectifying filter circuit into ac square wave；And after output rectification filter partial rectification and filtering, it is changed into direct voltage output.
3. the continuous-current plant as claimed in claim 2 cut for TURP, it is characterized in that：Inverter section includes the power electronic switching IGBT in the full-bridge circuit and prevents the resistance-capacitance absorption protection circuit that the IGBT is damaged when off.
4. the continuous-current plant as claimed in claim 3 cut for TURP, it is characterized in that：The driver of the IGBT belongs to hybrid integrated M579 series.
5. the continuous-current plant as claimed in claim 1 cut for TURP, it is characterized in that：It is TMS320LF2407A that the DSP, which controls the control core of circuit,.
6. the continuous-current plant as claimed in claim 2 cut for TURP, it is characterized in that：Input rectifying filtering part is made up of filter capacitor, commutation diode and current-limiting resistance.
7. the continuous-current plant as claimed in claim 6 cut for TURP, it is characterized in that：Filter capacitor is electrochemical capacitor, and the electrochemical capacitor simultaneously has equalizing resistance and the noninductive polarity free capacitor of high frequency.
8. the continuous-current plant as claimed in claim 2 cut for TURP, it is characterized in that：Output rectification filter part uses all-wave centre cap rectification, is made up of intermediate-frequency transformer, commutation diode, output filter capacitor and output direct current reactor.
9. the continuous-current plant as claimed in claim 8 cut for TURP, it is characterized in that：The magnetic core of intermediate-frequency transformer is Fe-Base nanocrystalline soft magnetic material.
10. the continuous-current plant as claimed in claim 8 cut for TURP, it is characterized in that：The magnetic core of intermediate-frequency transformer is E-type magnetic core.
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| CN2012105356850A CN103008804A (en) | 2012-12-12 | 2012-12-12 | Direct-current power supply device for electrical cutting |
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| CN2012105356850A CN103008804A (en) | 2012-12-12 | 2012-12-12 | Direct-current power supply device for electrical cutting |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106253702A (en) * | 2016-08-23 | 2016-12-21 | 合肥博雷电气有限公司 | The high voltage direct current source module that a kind of DSP controls |
| CN108601135A (en) * | 2018-03-02 | 2018-09-28 | 长沙凯上电子科技有限公司 | A kind of intelligent power control circuit and its control method |
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| CN101104219A (en) * | 2007-06-18 | 2008-01-16 | 华南理工大学 | High frequency contravariant direct-current spot-welding power supply device and its application |
| CN101527514A (en) * | 2008-03-04 | 2009-09-09 | 北京北方微电子基地设备工艺研究中心有限责任公司 | Direct current power supply |
| CN201490903U (en) * | 2009-04-28 | 2010-05-26 | 上海冶金矿山机械厂 | High-frequency impulse high-voltage regulating circuit |
| CN203003287U (en) * | 2012-12-12 | 2013-06-19 | 上海新维机电工程技术有限公司 | Direct-current power supply device used for electrical cutting |
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Patent Citations (5)
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| CN1753294A (en) * | 2004-09-22 | 2006-03-29 | 松下电器产业株式会社 | Direct current power supply apparatus and control method for the same, and a compressor drive apparatus |
| CN101104219A (en) * | 2007-06-18 | 2008-01-16 | 华南理工大学 | High frequency contravariant direct-current spot-welding power supply device and its application |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106253702A (en) * | 2016-08-23 | 2016-12-21 | 合肥博雷电气有限公司 | The high voltage direct current source module that a kind of DSP controls |
| CN108601135A (en) * | 2018-03-02 | 2018-09-28 | 长沙凯上电子科技有限公司 | A kind of intelligent power control circuit and its control method |
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Application publication date: 20130403 |