CN108422055B - A kind of waveform controlling method of spark pulse power and the electric power outputting current - Google Patents
A kind of waveform controlling method of spark pulse power and the electric power outputting current Download PDFInfo
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- CN108422055B CN108422055B CN201710075238.4A CN201710075238A CN108422055B CN 108422055 B CN108422055 B CN 108422055B CN 201710075238 A CN201710075238 A CN 201710075238A CN 108422055 B CN108422055 B CN 108422055B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23H—WORKING OF METAL BY THE ACTION OF A HIGH CONCENTRATION OF ELECTRIC CURRENT ON A WORKPIECE USING AN ELECTRODE WHICH TAKES THE PLACE OF A TOOL; SUCH WORKING COMBINED WITH OTHER FORMS OF WORKING OF METAL
- B23H1/00—Electrical discharge machining, i.e. removing metal with a series of rapidly recurring electrical discharges between an electrode and a workpiece in the presence of a fluid dielectric
- B23H1/02—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges
- B23H1/022—Electric circuits specially adapted therefor, e.g. power supply, control, preventing short circuits or other abnormal discharges for shaping the discharge pulse train
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- Generation Of Surge Voltage And Current (AREA)
Abstract
The invention discloses a kind of spark pulse powers, including breakdown circuit loop and constant current resource loop, breakdown circuit loop is made of concatenated DC source one, resistance, power switch tube one, diode one and discharging gap, is connected with sequence controller in power switch tube one；Constant current resource loop includes charging paths and afterflow branch, and charging paths are made of concatenated DC source two, power switch tube two, inductance, diode two, and afterflow branch routes concatenated inductance, diode two, DC source one, diode three and constitutes；And it is also in series with current sensor in charging paths, closed-loop current control device is connected between current sensor and power switch tube two, diode three is connected between current sensor and power switch tube two.The pulse power designed by the present invention is more energy saving than conventional power source, more efficient, while reducing the complexity of system than existing energy-saving power supply and reducing therefore bring unstable factor, improves reliability.
Description
Technical field
The present invention relates to power technique fields, it particularly relates to a kind of spark pulse power and power supply output electricity
The waveform controlling method of stream.
Background technique
In general, traditional electric spark working pulse power source energy consumption is very high, and power-efficient is all very low, rarely exceeds
30%, because the electric current of its output is much consumed by current-limiting resistance.Early stage spark erosion technique application, because at that time
Basic technology more falls behind and people more pursue processing performance, so conventional power source is widely applied, it is even so, such
The mainstream that power supply still still uses so far.However, energy conservation and environmental protection is increasingly subject to the pass of people with the development of modern society
Note, reduce energy consumption receives attention, so, traditional electrical discharge machining pulse power electric energy is paid attention to using low problem.For
It solves the problems, such as this, while meeting processing technology requirement, the utilization rate of electric energy should be further increased.
In recent years, some mechanisms have been developed that the energy-saving pulse power with closed-loop current control ability both at home and abroad,
Energy utilization rate to solve the problems, such as conventional power source is low.But existing energy-saving power supply largely uses high-low pressure compound
Mode, the high-pressure section and low-pressure section of power supply are that independently, high-pressure section is responsible for striking breakdown, and low-pressure section is responsible between electric discharge
Electric current used in ablation is provided to gap after gap breakdown.This mode requires power supply to have special sequence controller to go both control
Between conspiracy relation, make control become more sophisticated.
Electrical spark working working hour, the pulse power export the electric current of approximate square waves, are applicable to major applications occasion.Because by
The effect of different factors, the technic indexs such as export license, processing efficiency, surface roughness, machining accuracy are affected, need
The electric current of special waveform is exported to obtain desired processing index.For example in the low-loss processing for carrying out Steel material, need electricity
The forward position slope of stream is smaller；When progress fusing point, thermal coefficient, the biggish difficult-to-machine material of specific heat capacity are processed, electric current is needed to have
There is the higher feature in initial stage forward position.In order to solve these problems, it is desirable to which power supply has multiple waveforms control technology and can
To be applied accordingly under different occasions.
Currently, existing energy-saving power supply only has single or seldom output current wave, it is difficult to take into account processing difference
The special process demand of material.Although although conventional power source is easier to realize a variety of output current waves controls, energy consumption compared with
Greatly, such power supply will be eliminated gradually.Therefore, the waveform control problem for solving energy-saving electric power outputting current is electrical spark working
One of work field important research direction.
For the problems in the relevant technologies, the field is not yet announced and is put forward effective solutions at present.
Summary of the invention
The purpose of the present invention is to propose to a kind of spark pulse power and the waveform controlling method of the electric power outputting current, with
Overcome the above problem present in existing the relevant technologies.
The technical scheme of the present invention is realized as follows:
According to an aspect of the invention, there is provided a kind of spark pulse power.
The spark pulse power includes the constant-current source for puncturing circuit loop and being connected with the breakdown circuit loop
Circuit, wherein
The breakdown circuit loop is by concatenated DC source one, resistance, power switch tube one, diode one and discharging gap
It constitutes, is connected with sequence controller in the power switch tube one；
The constant current resource loop includes charging paths and afterflow branch, wherein the charging paths are by concatenated DC source
Two, power switch tube two, inductance, diode two are constituted, and the afterflow branch routes the concatenated inductance, diode two, described
DC source one, diode three are constituted；And current sensor is also in series in the charging paths, the current sensor with it is described
Closed-loop current control device is connected between power switch tube two, the diode three is connected to the current sensor and the function
Between rate switching tube two；
When the discharging gap is breakdown, the breakdown circuit loop and the constant current resource loop constitute discharge current and return
Road, wherein
The charging paths in the discharge current circuit are by the concatenated DC source one, the DC source two, the power
Switching tube two, the inductance, the power switch tube one, the diode one and the discharging gap are constituted, the electric discharge electricity
Flow back to road afterflow branch route the concatenated inductance, the power switch tube one, the diode one, the discharging gap and
The diode three is constituted.
Wherein, the current sensor is series between the power switch tube two and the inductance.
Wherein, the current sensor be series at the inductance and the diode and between.
Preferably, the control mode of the closed-loop current control device is PWM control mode.
Preferably, the power switch tube one includes any of the following: field-effect tube, triode or IGBT (insulated gate
Bipolar junction transistor).
Preferably, the power switch tube two includes any of the following: field-effect tube, triode or IGBT.
Preferably, the current sensor includes any of the following: current transformer, Hall sensor or accurate electricity
Resistance.
According to another aspect of the present invention, a kind of waveform controlling method of spark pulse power output electric current is provided,
For above-mentioned spark pulse power.
The waveform controlling method the following steps are included:
Target current value is set to closed-loop current control device in advance, and promoting the current value on inductance is the target current
Value；
Disruptive discharge gap, and after the discharging gap is breakdown, the electric current on the inductance is exported to described and is put
Electric gap；
It is pre-configured with detection unit to detect discharging gap, and is that the discharging gap is breakdown in testing result
In the case of, trigger signal is produced, and the trigger signal is sent to current controller；
After the current controller receives the trigger signal, new target current value is set, promotes the electricity in inductance
Stream is raised or lowered to the new target current value with certain slope, forms waveform.
Beneficial effects of the present invention: the pulse power designed by the present invention is more energy saving than conventional power source, more efficient, electricity
Can utilization rate reach 70% or more, power supply eliminates the high-power current-limiting resistance of conventional power source, reduce power supply calorific value and
Therefore bring heat dissipation problem.Power supply designed by the present invention also have than existing energy-saving power supply structure and control on more
Simplified feature reduces the complexity of system and reduces therefore bring unstable factor, improves reliability.
Output current wave control method of the present invention can be used as the section using inductance as output current filtering element
The control method of the energy type pulse power generally used, the method can increase the type of output current wave, and then promoted and added
Work performance, preferably satisfies the use demand.
Detailed description of the invention
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the topological circuit figure of spark pulse power according to an embodiment of the present invention；
Fig. 2 is the control flow of the waveform controlling method of spark pulse power output electric current according to an embodiment of the present invention
Block diagram；
Fig. 3 is the control principle of the waveform controlling method of spark pulse power output electric current according to an embodiment of the present invention
Figure.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art's every other embodiment obtained belong to what the present invention protected
Range.
According to an embodiment of the invention, providing a kind of spark pulse power.
As shown in Figure 1, it is same power supply that the hi-lo circuit of spark pulse power according to an embodiment of the present invention is practical
Two parts.By after gap breakdown, the height laminate section of power supply as a whole together exports gap the high-pressure section of power supply
Electric current is processed, and high-pressure section integrally switches with power supply not to be needed additional sequence circuit and controlled.In addition, the master of power supply
Circuit belongs to compound circuit, is made of tandem type switch current stabilization circuit with freewheeling circuit.
Specifically, when gap does not puncture, one G1 of power switch tube shutdown, there are two functions to return shown in continuing to refer to figure 1
Road:
High-voltage breakdown circuit loop (constant pressure source is also referred to as high tension loop), including one E1 of DC source, resistance R, power
One G1 of switching tube, one D1 of diode, discharging gap.This part is identical as traditional power supply high tension loop.
Constant current resource loop, the charging branch including two E2 of DC source, two G2 of power switch tube, inductance L, two D2 of diode composition
The afterflow branch that road and inductance L, one E1 of DC source, three D3 of diode are formed.
When specific works, firstly, being charged by two E2 of DC source to inductance L, electric current flows through two D2 of diode.When in inductance L
Electric current reach target value after, closed-loop current control device by two G2 of power switch tube turn off, the electric current in inductance L is through two poles at this time
Two D2 of pipe, three D3 of diode are fed back in one E1 of DC source.
After gap breakdown, when one G1 of power switch tube is closed, circuit is made of a functional loop:
Discharge current circuit (constant-current source circuit), including one E1 of DC source and two E2 of DC source, two G2 of power switch tube, electricity
Feel the charging paths of L, one G1 of power switch tube, one D1 of diode, discharging gap composition；Inductance L, one G1 of power switch tube, two
The afterflow branch that one D1 of pole pipe, discharging gap, three D3 of diode are formed.
When specific works, by when two G2 of power switch tube is opened, by one E1 of DC source and two E2 of DC source jointly to electricity
Feel L charging, electric current flows through inductance L, one D1 of diode and discharging gap, discharges gap.When two G2 of power switch tube is closed
It has no progeny, the energy of inductance L storage continues to gap discharge, and electric current flows through three D3 of one D1 of diode, discharging gap and diode.
When specifically used, the control mode of closed-loop current control device is PWM control mode, one G1 power of power switch tube
Switching tube two and G2 are included any of the following: field-effect tube, triode or IGBT (insulated gate bipolar transistor).And electric current
Sensor then may include it is following any one: current transformer, Hall sensor or precision resistance.
It can be seen that the inductive current in above-mentioned power supply is controlled volume, and under PWM closed control machining function, electricity
Sense storage energy is constantly stored and is discharged, and makes inductive current that high frequency saw-like tooth waveform be presented, this electric current is output in gap, is produced
Raw ablation effect.The major loop structure of this power supply can export biggish electric current both to adapt to the need of big removal amount processing
It wants, the needs that lesser electric current adapts to finishing can also be exported by adjusting the parameter of the elements such as inductance.It is in detection circuit
Under the collective effect of closed-loop current control device, it is possible to provide different processing electric currents export multiple waveforms.
According to an embodiment of the invention, a kind of waveform controlling method of spark pulse power output electric current is additionally provided,
For above-mentioned spark pulse power.
As shown in Fig. 2, the waveform controlling method the following steps are included:
Step S101 sets target current value to closed-loop current control device in advance, and promotes the current value on inductance for institute
State target current value；
Step S103, disruptive discharge gap, and after the discharging gap is breakdown, the electric current on the inductance is exported
To the discharging gap；
Step S105 is pre-configured with detection unit and detects to discharging gap, and in testing result between the electric discharge
In the case that gap is breakdown, trigger signal is produced, and the trigger signal is sent to current controller；
Step S107 after the current controller receives the trigger signal, sets new target current value, promotes electricity
Electric current in sense is raised or lowered to the new target current value with certain slope, forms waveform.
In order to facilitate above-mentioned technical proposal of the invention is understood, above-mentioned technical proposal is carried out below by way of the mode of example
It is described in detail.
As shown in figure 3, the process of different wave is as follows:
At the t0 moment, discharging gap does not puncture at this time, and power source internal current setting value is r1, the inductance inside constant-current source
Upper current cycle remains r1, and t1 moment discharging gap is breakdown, and gap voltage u, which declines rapidly, the higher-order of oscillation occurs.Detection electricity
Road, which detects, sends a trigger signal to current controller after gap is breakdown, and current controller sets new target electricity immediately
Flow valuve r2, the electric current on inductance will not be mutated or r1 at this time.After gap breakdown inductance and with discharging gap constitute one it is new
Circuit, therefore, the t1 moment flow through discharging gap gap current and output current filtering inductance on essentially identical (this of electric current
Place, the influence of distribution parameter are very small), and as the time rises to new target value r2, the electric current of output with certain slope
It is formed the waveform with certain inclination angle approximate trapezoid.
At the t2 moment, power supply turns off the current loop for being output to discharging gap, gap voltage zero, on filter inductance
Electric current is circulated in the inside of power supply again.At this point, the electric current on inductance carries out internal circulation by target of r3.?
At the t3 moment, discharging gap is breakdown again and detected circuit detects, trigger signal issues current controller, electric current again
Controller sets new target current value r2 immediately.At this point, the electric current on filter inductance will not be mutated or r3, by one section
Time keeps stablizing after dropping to target value r2, and discharging gap is also the same with the electric current on filter inductance, before output one has
Along higher current waveform, it is turned off in the circuit of t4 moment discharge current, gap current zero, filter inductance switches again
To power source internal circuit, and continue to keep using r2 as target.
It is breakdown again in t5 moment discharging gap, and at this point, current controller target value is unchanged or r2, it puts at this time
Electric current on electric gap is exported by target of r2, and the waveform of output is approximately square wave.
In conclusion the pulse power designed by the present invention compares conventional power source by means of above-mentioned technical proposal of the invention
More energy saving, more efficient, utilization rate of electrical reaches 70% or more, and power supply eliminates the high-power current-limiting resistance of conventional power source,
Reduce calorific value and therefore the bring heat dissipation problem of power supply.Power supply designed by the present invention also has than existing energy-saving electrical
Source feature more simplified in structure and control, reduce the complexity of system and reduce therefore bring it is unstable because
Element improves reliability.
Output current wave control method of the present invention can be used as the section using inductance as output current filtering element
The control method of the energy type pulse power generally used, the method can increase the type of output current wave, and then promoted and added
Work performance, preferably satisfies the use demand.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the invention
Within mind and principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of spark pulse power, which is characterized in that including breakdown circuit loop and with the breakdown circuit loop phase
The constant current resource loop of connection, wherein
The breakdown circuit loop is by concatenated DC source one, resistance, power switch tube one, diode one and discharging gap structure
At being connected with sequence controller in the power switch tube one；
The constant current resource loop includes charging paths and afterflow branch, wherein the charging paths are by concatenated DC source two, function
Rate switching tube two, inductance, diode two are constituted, and the afterflow branch routes the concatenated inductance, diode two, the DC source
One, diode three is constituted；And current sensor is also in series in the charging paths, the current sensor and the power
Closed-loop current control device is connected between switching tube two, the diode three is connected to the current sensor and opens with the power
It closes between pipe two；
When the discharging gap is breakdown, the breakdown circuit loop and the constant current resource loop constitute discharge current circuit,
Wherein,
The charging paths in the discharge current circuit are by the concatenated DC source one, the DC source two, the power switch
Pipe two, the inductance, the power switch tube one, the diode one and the discharging gap are constituted, and the discharge current returns
The afterflow branch on road routes the concatenated inductance, the power switch tube one, the diode one, the discharging gap and described
Diode three is constituted.
2. spark pulse power according to claim 1, which is characterized in that the current sensor is series at the function
Between rate switching tube two and the inductance.
3. spark pulse power according to claim 1, which is characterized in that the current sensor is series at the electricity
Between sense and the diode two.
4. spark pulse power according to claim 1, which is characterized in that the controlling party of the closed-loop current control device
Formula is PWM control mode.
5. spark pulse power according to claim 1, which is characterized in that the power switch tube one includes following
It anticipates one kind:
Field-effect tube, triode or IGBT.
6. spark pulse power according to claim 1, which is characterized in that the power switch tube two includes following
It anticipates one kind:
Field-effect tube, triode or IGBT.
7. spark pulse power according to claim 1, which is characterized in that the current sensor includes following any
It is a kind of:
Current transformer, Hall sensor or precision resistance.
8. a kind of waveform controlling method of spark pulse power output electric current, which is characterized in that in claim 1 to 6
Spark pulse power described in any one, also, the waveform controlling method the following steps are included:
Target current value is set to closed-loop current control device in advance, and promoting the current value on inductance is the target current value；
Disruptive discharge gap, and after the discharging gap is breakdown, the electric current on the inductance is exported between the electric discharge
Gap；
It is pre-configured with detection unit to detect discharging gap, and is the breakdown situation of the discharging gap in testing result
Under, trigger signal is produced, and the trigger signal is sent to current controller；
After the current controller receives the trigger signal, set new target current value, promote the electric current in inductance with
Certain slope is raised or lowered to the new target current value, forms waveform.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710075238.4A CN108422055B (en) | 2017-02-13 | 2017-02-13 | A kind of waveform controlling method of spark pulse power and the electric power outputting current |
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| CN201710075238.4A CN108422055B (en) | 2017-02-13 | 2017-02-13 | A kind of waveform controlling method of spark pulse power and the electric power outputting current |
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| CN108422055B true CN108422055B (en) | 2019-07-26 |
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Families Citing this family (1)
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| CN112828403B (en) * | 2020-12-30 | 2022-05-03 | 山东豪迈机械科技股份有限公司 | Electric spark machining discharge state detection circuit and method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS538899A (en) * | 1976-07-14 | 1978-01-26 | Mitsubishi Electric Corp | Spark erosion machine |
| CN202763233U (en) * | 2012-02-20 | 2013-03-06 | 何立衡 | Electric spark processing machine |
| CN202824897U (en) * | 2012-09-26 | 2013-03-27 | 苏州三特科技有限公司 | Improved electrical process machine pulsed power supply |
| CN103464844B (en) * | 2013-09-26 | 2015-07-29 | 苏州群伦精密机电工业有限公司 | A kind of electric discharge processing circuit |
| CN104475886B (en) * | 2014-12-25 | 2017-02-22 | 西安建筑科技大学 | Chopped-mode energy-saving electromachining pulse power supply |
| CN206614115U (en) * | 2017-02-13 | 2017-11-07 | 北京机床所精密机电有限公司 | A kind of spark pulse power |
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