CN104506073A - Electric spark power source and working method thereof - Google Patents
Electric spark power source and working method thereof Download PDFInfo
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- CN104506073A CN104506073A CN201510013933.9A CN201510013933A CN104506073A CN 104506073 A CN104506073 A CN 104506073A CN 201510013933 A CN201510013933 A CN 201510013933A CN 104506073 A CN104506073 A CN 104506073A
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Abstract
The invention relates to an electric spark power source and a working method thereof. The electric spark power source comprises that a direct current input voltage is connected with a voltage division circuit; the voltage division circuit is connected with an input-series output interleaving forward conversion circuit; the input-series output interleaving forward conversion circuit and current pulse output form into circuit connection; a first primary side switch pipe, a second primary side switch pipe, a first primary side flywheel dioxide, a second primary side flywheel dioxide, a first high-frequency transformer and a first secondary side rectifying diode commonly form into a first circuit; a third primary side switch pipe, a fourth primary side switch pipe, a third primary side flywheel dioxide, a fourth primary side flywheel dioxide, a second high-frequency transformer and a second secondary rectifying diode commonly form into a second circuit; output of the first circuit and the second circuit is respectively in parallel connection at two ends of the secondary side flywheel diodes; the first circuit, the second circuit, the secondary side flywheel diodes and filter inductance commonly form into the input-series output interleaving forward conversion circuit; the input-series output interleaving forward conversion circuit, the direct current input voltage and the voltage division circuit commonly form into a pre-level circuit; a secondary side switch pipe, an output diode pipe and current pulse output which is formed due to the fact that the current pulse outputs buffering capacitance form into a circuit, namely a post-level circuit. The electric spark power source improves the machining accuracy and the machining accuracy and meanwhile greatly improves the electric energy utilization rate.
Description
Technical field
The present invention relates to a kind of circuit field, particularly relate to a kind of electric spark power supply and method of work thereof.
Background technology
At present, spark machined utilizes sparkover corroding metal to realize the processing method of metal cutting.The process of this processing compensate for some deficiency of machining, has become the important means in mould industry, national defense industry and precise and tiny manufacture.Electric spark power supply is as important composition parts in EDM System, in order to provide pulse current, form sparkover, the technical-economic index such as machining accuracy, production efficiency, tool electrode loss, utilization rate of electrical of its performance on spark machined has larger impact.
The type of electric spark power supply has multiple, as tension and relaxation formula RC power supply, pulsed motor formula electric spark power supply, resistance current-limiting type electric spark power supply etc.Tension and relaxation formula RC power supply is the electric spark power supply used the earliest, and its structure is simple, but there is the shortcomings such as electrical quantity shakiness, process velocity is low, utilization rate of electrical is low.What current spark machined generally adopted is resistance current-limiting type electric spark power supply, it adopts Industrial Frequency Transformer to isolate transformation, the direct voltage about 80 to 100 volts is obtained after rectifying and wave-filtering, and carry out current limliting with resistance, the turn-on and turn-off of power switch pipe are controlled according to certain rule, realize spark machined and puncture delay, disruptive discharge, the moving in circles of deionization three states, complete electric transformation of energy, reach the object of processing.The shortcoming that resistance current-limiting type electric spark power supply exists mainly comprises: (1) utilization rate of electrical is low, is generally less than 25%, and ventilation and heat conditional request is high; (2) during output short-circuit, processing electric current is large, easily burn processing work surface; (3) Industrial Frequency Transformer volume weight is large.
Along with the progress of power electronic technology, people have started to adopt DC/DC converter technique to develop without current-limiting resistance electric spark power supply.At present, mainly adopt single stage type structure without current-limiting resistance HF switch type electric spark power supply, its main circuit is high frequency DC/DC converter, utilizes current limit by inductance.Single stage type HF switch electric spark power-efficient can more than 85%, far above resistance current-limiting type electric spark power-efficient.But still there is the shortcomings such as the low and machining accuracy of working (machining) efficiency is not high in it.This is because electric current also exists rising and decline stage during disruptive discharge, and rise time and fall time along with current setting value and filter inductance value increase and increase, in order to ensure that processing electric current rises to set point and drop to zero, processing pulsewidth and deionization time sufficiently long.Moreover the filter inductance of power supply forms loop with machining gap all the time, the energy that filter inductance stores when switching tube turns off discharges to machining gap, and processing electric current trails, therefore machining accuracy is not high.
In addition for common without current-limiting resistance HF switch type electric spark power supply in the market, also there is a problem: in the input of needs three-phase alternating voltage and powerful application scenario, high switching tube that is withstand voltage and low on-resistance is difficult to obtain.This is because the direct voltage after the rectification of three-phase alternating current input voltage reaches as high as 645 volts (calculating by effective value=380V+20%), and the withstand voltage of switch mosfet pipe mostly generally is 400V or 500V on market, and the conducting resistance of switch mosfet pipe becomes large with the increase of its withstand voltage; And for IGBT switching tube, its withstand voltage common are 600V and 1200V, although the IGBT switching tube of 1200V can bear the direct voltage after rectification, its conduction voltage drop is large, switching frequency not high (compared with MOSFET), there is current tail.
In sum, the electric spark power supply of current use exists that utilization rate of electrical is low, short circuit current large, easily burn processing work surface, Industrial Frequency Transformer volume weight is large, working (machining) efficiency is low, machining accuracy is not high or there is the shortcomings such as current tail, particularly in high voltage input and the rarer good performance of high-power applications occasion.
Because above-mentioned defect, the design people, actively in addition research and innovation, to founding a kind of electric spark power supply and method of work thereof of new structure, make it have more value in industry.
Summary of the invention
For solving the problems of the technologies described above, the object of this invention is to provide a kind of electric spark circuit construction of electric power and method of work thereof.
Electric spark power supply of the present invention, comprise: DC input voitage connects the bleeder circuit be made up of the first electric capacity and the second capacitances in series, bleeder circuit and input are connected and are exported crisscross parallel forward conversion circuit and be connected, input series connection exports crisscross parallel forward conversion circuit and current impulse and exports and form circuit and be connected, wherein, first former limit switching tube, second former limit switching tube, first former limit fly-wheel diode, second former limit fly-wheel diode, first high frequency transformer and the first secondary rectifier diode form the first via that input series connection exports crisscross parallel forward conversion circuit jointly, 3rd former limit switching tube, the 4th former limit switching tube, the 3rd former limit fly-wheel diode, the 4th former limit fly-wheel diode, the second high frequency transformer and the second secondary rectifier diode form the second tunnel that input series connection exports crisscross parallel forward conversion circuit jointly, the described output inputting the first via of connecting and exporting crisscross parallel forward conversion circuit and the second tunnel inputting output crisscross parallel forward conversion circuit of connecting is connected in parallel on the two ends of secondary fly-wheel diode respectively, the first via of described input series connection output crisscross parallel forward conversion circuit, described input series connection export the second tunnel of crisscross parallel forward conversion circuit, described secondary fly-wheel diode and filter inductance and jointly form input series connection output crisscross parallel forward conversion circuit, and itself and DC input voitage, bleeder circuit form front stage circuits jointly, secondary-side switch pipe, output diode, the current impulse of current impulse output buffer capacitor composition export and form circuit, i.e. late-class circuit, and then current impulse output formation circuit is connected in load.
Further, input series connection exports crisscross parallel forward conversion circuit for controlling the electric current in filter inductance, and to provide comparatively stable electric spark current amplitude, this amplitude can be set control.
Further, described current impulse exports and forms circuit for controlling discharge time and the deionization time of electric spark.
A kind of method of work utilizing above-mentioned electric spark power supply, in the first moment, in front stage circuits the first former limit switching tube and the second former limit switching tube open-minded, 3rd former limit switching tube and the 4th former limit switching tube are in off state, input series connection exports the first via work of crisscross parallel forward conversion circuit, voltage on first electric capacity is added to the former limit of the first high frequency transformer through the first former limit switching tube and the second former limit switching tube, its secondary induced voltage is after the rectification of the first secondary rectifier diode, between the two ends being added to secondary fly-wheel diode, prime secondary exports commutating voltage and makes the electric current in filter inductance increase.
Further, in the second moment, in front stage circuits, the first former limit switching tube and the second former limit switching tube turn off, 3rd former limit switching tube and the 4th former limit switching tube are in off state, first high frequency transformer former limit winding current is through the first former limit fly-wheel diode and the second former limit fly-wheel diode afterflow, it is zero that its prime secondary exports commutating voltage, and the electric current in filter inductance declines.
Further, in the 3rd moment, in front stage circuits the 3rd former limit switching tube and the 4th former limit switching tube open-minded, first former limit switching tube and former limit switching tube are in off state, input series connection exports the second tunnel work of crisscross parallel forward conversion circuit, voltage on second electric capacity is added to the former limit of the second high frequency transformer through the 3rd former limit switching tube and the 4th former limit switching tube, its secondary induced voltage is through the second secondary rectifies, between the two ends being added to secondary fly-wheel diode, prime secondary exports commutating voltage and makes the electric current of filter inductance increase.
Further, in the 4th moment, in front stage circuits, the 3rd former limit switching tube and the 4th former limit switching tube turn off, first former limit switching tube and the second former limit switching tube are in off state, second high frequency transformer former limit winding current is through the 3rd former limit fly-wheel diode and the 4th former limit fly-wheel diode afterflow, it is zero that its prime secondary exports commutating voltage, and the electric current in filter inductance declines.
Further, to the 5th moment, start the next switch periods of front stage circuits.
Further, electric current in described filter inductance is controlled as approximately constant, when secondary-side switch pipe in late-class circuit turns off, electric current in filter inductance exports buffer capacitor charging through output diode to current impulse, rise on the output voltage until make before the working clearance punctures, output voltage remains linear and rises.
Further, when output voltage rises until make the working clearance puncture, when forming sparkover, output voltage drops to the ME for maintenance of sparkover, and prime inductive current is flow through between the positive and negative electrode of electric spark power supply by the form of sparkover.
Further, when in late-class circuit, secondary-side switch pipe is opened, the electric current in filter inductance is through the bypass of secondary-side switch pipe, and spark machined output current is cut off, and enters the deionization stage.
Further, when secondary-side switch pipe turns off, start the next switch periods of late-class circuit.
By such scheme, the present invention at least has the following advantages:
Electric spark power supply of the present invention, derided capacitors is connected to by DC input voitage (or the voltage after ac voltage rectifier), be connected to the double tube positive exciting translation circuit (front stage circuits) of 2 input side series connection, then be connected to current impulse formation circuit (late-class circuit).
Compared with prior art, its advantage had comprises in the present invention:
1, adopt HF switch Technics of Power Electronic Conversion technology, replace Industrial Frequency Transformer with high frequency transformer, reduce volume weight; The series connection of its direct current input side makes former limit switch tube voltage stress reduce by half, and can adopt the switching tube of low withstand voltage and low on-resistance, reduces costs and increase power conversion efficiency; Transformer secondary crisscross parallel can realize all pressures of input side series capacitance automatically, reduces the ripple of outputting inductance electric current, improves machining accuracy.
2, adopt two-stage Current Control, one is the electric current in front stage circuits current constant control outputting inductance, and to provide comparatively stable pulse current amplitude, two is that late-class circuit controls by-pass switch pipe to determine the time length of sparkover and deionization.Make short circuit current be not more than controlled pulse current amplitude like this, and guarantee that the back to zero of gap current does not exist conditions of streaking.Improve machining accuracy and working (machining) efficiency, substantially increase the utilance of electric energy simultaneously.
Above-mentioned explanation is only the general introduction of technical solution of the present invention, in order to better understand technological means of the present invention, and can be implemented according to the content of specification, coordinates accompanying drawing to be described in detail as follows below with preferred embodiment of the present invention.
Accompanying drawing explanation
Fig. 1 is the composition frame chart of electric spark power supply of the present invention;
Fig. 2 is electric spark power principle figure of the present invention;
Fig. 3 is the main waveform schematic diagram of front stage circuits of the present invention;
Fig. 4 is the main waveform schematic diagram of late-class circuit of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
For the situation being difficult to obtain high withstand voltage and low on-resistance switching tube under high input voltage and large-power occasions, a kind of electric spark power supply is provided, the series connection of its direct current input side makes the voltage stress of former limit switching tube reduce by half, therefore former limit can adopt the switching tube of low withstand voltage and low on-resistance, reduces costs and increases power conversion efficiency; Secondary adopts crisscross parallel automatically can realize all pressures of direct current input side series capacitance, can reduce the ripple of outputting inductance electric current simultaneously, improves spark machined precision; Spark machined electric current is controlled by two parts, one is carry out current constant control (to provide comparatively stable current amplitude to the electric current in outputting inductance, its size is determined by magnitude current reference value), two is control by-pass switch pipe to determine the time length of sparkover and deionization, and guarantees that the back to zero of gap current does not exist conditions of streaking.
See Fig. 1, a kind of composition frame chart of electric spark power supply, comprise DC input voitage 1, bleeder circuit 2, input series connection exports crisscross parallel forward conversion circuit 3 and current impulse forms circuit 4, and Fig. 2 is above-mentioned electric spark power principle figure, can be known by the content disclosed in Fig. 1 and Fig. 2, DC input voitage 1 (U
i) (or the direct voltage after ac voltage rectifier) connect by the first electric capacity C
1with the second electric capacity C
2the bleeder circuit 2 be composed in series, bleeder circuit 2 and input connects and are exported crisscross parallel forward conversion circuit 3 and be connected, and connect output crisscross parallel forward conversion circuit 3 and current impulse of input exports and form circuit 4 and be connected.Wherein the first former limit switching tube S
1, the second former limit switching tube S
2, the first former limit sustained diode
1, the second former limit sustained diode
2, the first high frequency transformer T
1with the first secondary rectifier diode D
5common composition input series connection exports a road (the abbreviation first via) of crisscross parallel forward conversion circuit 3; 3rd former limit switching tube S
3, the 4th former limit switching tube S
4, the 3rd former limit sustained diode
3, the 4th former limit sustained diode
4, the second high frequency transformer T
2with the second secondary rectifier diode D
6common composition input series connection exports an other road (being called for short the second tunnel) of crisscross parallel forward conversion circuit 3.The output on the first via and the second tunnel is connected in parallel on secondary sustained diode respectively
7two ends, namely as A point and the B point of Fig. 2, the first via, the second tunnel, secondary sustained diode
7and filter inductance L forms input series connection output crisscross parallel forward conversion circuit 3 jointly.Secondary-side switch pipe S
5, output diode D
8, current impulse exports buffer capacitor C
3composition current impulse exports and forms circuit 4, and then current impulse output formation circuit 4 is connected in load.Input series connection exports crisscross parallel forward conversion circuit 3 and adopts input side to connect to be voltage stress in order to reduce former limit switching tube, and adopting and exporting crisscross parallel is biasing problem in order to solve series connection bleeder circuit electric capacity.It is carry out current constant control to the electric current in filter inductance L that input series connection exports crisscross parallel forward conversion circuit 3, is for pulse output circuit provides a controlled constant amplitude.Control secondary-side switch pipe S
5shutoff and conducting, discharge time and the deionization time of electric spark can be controlled.
Front stage circuits includes DC input voitage 1, and bleeder circuit 2 and input series connection export crisscross parallel forward conversion circuit 3, and late-class circuit is specially circuit 4.Fig. 3 is the main waveform schematic diagram of front stage circuits.As can be seen from Figure 3, in 1 switch periods of front stage circuits, 4 switch mode can roughly be there are.Comprise specific as follows:
1, as [t in Fig. 3
1, t
2] the front stage circuits switch mode 1 of period.
First moment t
1, the first former limit switching tube S
1with the second former limit switching tube S
2open-minded, the 3rd former limit switching tube S
3with the 4th former limit switching tube S
4be in off state, input series connection exports the first via work of crisscross parallel forward conversion circuit 3, the first electric capacity C
1on voltage through the first former limit switching tube S
1with the second former limit switching tube S
2be added to the first high frequency transformer T
1former limit, its secondary induced voltage, through the first secondary rectifier diode D
5rectification after, be added between A point and B point, prime secondary exports commutating voltage u
rmake the current i in filter inductance L
lrise.
2, as [t in Fig. 3
2, t
3] the front stage circuits switch mode 2 of period.
Second moment t
2, the first former limit switching tube S
1with the second former limit switching tube S
2turn off, the 3rd former limit switching tube S
3with the 4th former limit switching tube S
4be in off state, the first high frequency transformer T
1former limit winding current is through the first former limit sustained diode
1with the second former limit sustained diode
2afterflow, its prime secondary exports commutating voltage u
rbe zero, the current i in filter inductance L
ldecline.
2, as [t in Fig. 3
3, t
4] the front stage circuits switch mode 3 of period.
3rd moment t
3, the 3rd former limit switching tube S
3with the 4th former limit switching tube S
4open-minded, the first former limit switching tube S
1with former limit switching tube S
2be in off state, input series connection exports the second tunnel work of crisscross parallel forward conversion circuit 3, the second electric capacity C
2on voltage through the 3rd former limit switching tube S
3with the 4th former limit switching tube S
4be added to the second high frequency transformer T
2former limit, its secondary induced voltage is through the second secondary rectifier diode D
6rectification, is added between A point and B point, and prime secondary exports commutating voltage u
rmake the current i in filter inductance L
lrise.
4, as [t in Fig. 3
4, t
5] the front stage circuits switch mode 4 of period.
4th moment t
4, the 3rd former limit switching tube S
3with the 4th former limit switching tube S
4turn off, the first former limit switching tube S
1with the second former limit switching tube S
2be in off state, the second high frequency transformer T
2former limit winding current is through the 3rd former limit sustained diode
3with the 4th former limit sustained diode
4afterflow, its prime secondary exports commutating voltage u
rbe zero, the current i in filter inductance L
ldecline.To the 5th moment t
5, start the next switch periods of repetition.Front stage circuits works, and the current be maintained constant in control inductance L is (at I
lfluctuate slightly in place, I
lcan setup control).
Fig. 4 is the main waveform schematic diagram of late-class circuit.As shown in Figure 4, in 1 switch periods of late-class circuit, there are 3 switch mode, in order to illustrate that operation principle is convenient, assuming that the current constant in inductance L, is I
l.
1, as [t in Fig. 4
a1, t
a2] the late-class circuit switch mode 1 of period.
A1 moment t
a1, secondary-side switch pipe S
5turn off, the electric current I in filter inductance L
lthrough output diode D
8buffer capacitor C is exported to current impulse
3charging, its output voltage u
olinear rising fast, until moment t
a2.
2, as [t in Fig. 4
a2, t
a3] the late-class circuit switch mode 2 of period.
A2 moment t
a2, output voltage u
orise to enough large, the working clearance is punctured, forms sparkover, output voltage u
oquickly fall to the ME for maintenance (generally between 20V ~ 25V) of sparkover, prime inductive current I
lbetween the positive and negative electrode being flow through electric spark power supply by the form of sparkover, namely there is spark machined current i this period
o=I
l.
3, as [t in Fig. 4
a3, t
a4] the late-class circuit switch mode 3 of period.
A3 moment t
a3, secondary-side switch pipe S
5open-minded, the electric current I in filter inductance L
lthrough secondary-side switch pipe S
5bypass, spark machined output current i
ocut-off, i
o=0.To moment t
a4, secondary-side switch pipe S
5turn off, start next switch periods.Late-class circuit works, and mainly controls discharge time and the deionization time of electric spark.
The various parameters of above-mentioned electric spark power supply are described below again, the DC input voitage 430V after three-phase alternating voltage rectification ~ 650V with a concrete example; Output current amplitude I
l=20A; First high frequency transformer T
1with the second high frequency transformer T
2the former secondary turn ratio=7; In inductance L=100uH; Export buffer capacitor C
3=200nF; First electric capacity C
1=the second electric capacity C
2=100uF, the first former limit switching tube S
1, the second former limit switching tube S
2, the 3rd former limit switching tube S
3with the 4th former limit switching tube S
4all adopt IRFP460 (500V/20A); Secondary-side switch pipe S
5adopt two IRFP264 (250V/38A) in parallel; First former limit sustained diode
1, the second former limit sustained diode
2, the 3rd former limit sustained diode
3with the 4th former limit sustained diode
4all adopt BYV26C (600V/1A); First secondary rectifier diode D
5, the second secondary rectifier diode D
6, secondary sustained diode
7with output diode D
8all adopt FFA15U20DN (200V/15A) in parallel to pipe.
From the above, there is following advantage in the electric spark power supply that the present invention proposes:
1. the voltage stress of former limit switching tube can be made to reduce by half, thus easily select the switching tube of low withstand voltage low on-resistance, Lifting Transform efficiency, reduces costs.
2. can control respectively the amplitude of output current, the discharge time of electric spark and deionization time, electric spark current rising and falling time is short, there is not current tail phenomenon, without short circuit current (namely during short circuit, electric current does not increase).
3. power acquisition high frequency transformer, without Industrial Frequency Transformer, greatly reduces volume weight, and power conversion efficiency is high simultaneously, in addition without current-limiting resistance, makes utilization rate of electrical high.
4. crisscross parallel makes the voltage automatically equalizing voltage on derided capacitors.
This power supply owing to adopting cascaded structure mode in DC input voitage side, therefore can make former limit switch tube voltage stress reduce by half, and can adopt the switching tube of low withstand voltage and low on-resistance, reduces costs and increase transformation of electrical energy efficiency; Its transformer secondary crisscross parallel can realize all pressures of input side series capacitance automatically, reduces the ripple of outputting inductance electric current, improves machining accuracy; This power acquisition two-stage Current Control, one is the electric current in front stage circuits current constant control outputting inductance, to provide comparatively stable pulse current amplitude, two is that late-class circuit controls secondary by-pass switch pipe to determine the time length of sparkover and deionization, short circuit current is made to be not more than controlled pulse current amplitude like this, and guarantee that the back to zero of gap current does not exist conditions of streaking, improve machining accuracy and working (machining) efficiency, substantially increase the utilance of electric energy simultaneously.
The above is only the preferred embodiment of the present invention; be not limited to the present invention; should be understood that; for those skilled in the art; under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and modification, these improve and modification also should be considered as protection scope of the present invention.
Claims (10)
1. an electric spark power supply, it is characterized in that, comprise: DC input voitage connects the bleeder circuit be made up of the first electric capacity and the second capacitances in series, bleeder circuit and input are connected and are exported crisscross parallel forward conversion circuit and be connected, input series connection exports crisscross parallel forward conversion circuit and current impulse and exports and form circuit and be connected, wherein, first former limit switching tube, second former limit switching tube, first former limit fly-wheel diode, second former limit fly-wheel diode, first high frequency transformer and the first secondary rectifier diode form the first via that input series connection exports crisscross parallel forward conversion circuit jointly, 3rd former limit switching tube, the 4th former limit switching tube, the 3rd former limit fly-wheel diode, the 4th former limit fly-wheel diode, the second high frequency transformer and the second secondary rectifier diode form the second tunnel that input series connection exports crisscross parallel forward conversion circuit jointly, described input series connection exports the two ends that output that the first via of crisscross parallel forward conversion circuit and input series connection export the second tunnel of crisscross parallel forward conversion circuit is connected in parallel on secondary fly-wheel diode respectively, and described input series connection exports the first via of crisscross parallel forward conversion circuit, described input series connection exports the second tunnel of crisscross parallel forward conversion circuit, described secondary fly-wheel diode and filter inductance and jointly forms input series connection and export crisscross parallel forward conversion circuit, secondary-side switch pipe, output diode, the current impulse of current impulse output buffer capacitor composition export and form circuit, and then current impulse output formation circuit is connected in load.
2. electric spark power supply according to claim 1, is characterized in that: described input series connection exports crisscross parallel forward conversion circuit for controlling the electric current in filter inductance, and to provide stable electric spark current amplitude, this amplitude is set control.
3. electric spark power supply according to claim 1, is characterized in that: described current impulse exports and forms circuit for controlling discharge time and the deionization time of electric spark.
4. one kind utilizes the method for work of the electric spark power supply of described claim 1-3, it is characterized in that: in the first moment, first former limit switching tube and the second former limit switching tube open-minded, 3rd former limit switching tube and the 4th former limit switching tube are in off state, input series connection exports the first via work of crisscross parallel forward conversion circuit, voltage on first electric capacity is added to the former limit of the first high frequency transformer through the first former limit switching tube and the second former limit switching tube, its secondary induced voltage is after the rectification of the first secondary rectifier diode, between the two ends being added to secondary fly-wheel diode, prime secondary exports commutating voltage and makes the electric current in filter inductance increase.
5. the method for work of the electric spark power supply described in utilization according to claim 4, it is characterized in that: in the second moment, first former limit switching tube and the second former limit switching tube turn off, 3rd former limit switching tube and the 4th former limit switching tube are in off state, first high frequency transformer former limit winding current is through the first former limit fly-wheel diode and the second former limit fly-wheel diode afterflow, it is zero that its prime secondary exports commutating voltage, and the electric current in filter inductance declines.
6. the method for work of the electric spark power supply described in utilization according to claim 4, it is characterized in that: in the 3rd moment, 3rd former limit switching tube and the 4th former limit switching tube open-minded, first former limit switching tube and the second former limit switching tube are in off state, input series connection exports the second tunnel work of crisscross parallel forward conversion circuit, voltage on second electric capacity is added to the former limit of the second high frequency transformer through the 3rd former limit switching tube and the 4th former limit switching tube, its secondary induced voltage is through the second secondary rectifies, between the two ends being added to secondary fly-wheel diode, prime secondary exports commutating voltage and makes the electric current in filter inductance increase.
7. the method for work of the electric spark power supply described in utilization according to claim 4, it is characterized in that: in the 4th moment, 3rd former limit switching tube and the 4th former limit switching tube turn off, first former limit switching tube and the second former limit switching tube are in off state, second high frequency transformer former limit winding current is through the 3rd former limit fly-wheel diode and the 4th former limit fly-wheel diode afterflow, it is zero that its prime secondary exports commutating voltage, and the electric current in filter inductance declines.
8. the method for work of the electric spark power supply described in utilization according to claim 4, current constant in described filter inductance, it is characterized in that, when secondary-side switch pipe turns off, electric current in filter inductance exports buffer capacitor charging through output diode to current impulse, rise on the output voltage until make before the working clearance punctures, output voltage remains linear and rises.
9. the method for work of the electric spark power supply described in utilization according to claim 8, it is characterized in that, when output voltage rises until make the working clearance puncture, when forming sparkover, output voltage drops to the ME for maintenance of sparkover, and prime inductive current is flow through between the positive and negative electrode of electric spark power supply by the form of sparkover.
10. the method for work of the electric spark power supply described in utilization according to claim 9, is characterized in that, when secondary-side switch pipe is opened, the electric current in filter inductance is through the bypass of secondary-side switch pipe, and spark machined output current is cut off; When secondary-side switch pipe turns off, start next switch periods.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109194144A (en) * | 2018-08-10 | 2019-01-11 | 合肥华耀电子工业有限公司 | A kind of double positive activation type booster circuits of crisscross parallel |
| CN109756118A (en) * | 2017-11-02 | 2019-05-14 | 山东朗进科技股份有限公司 | A kind of double-ended power translation circuit |
| CN113595366A (en) * | 2021-06-18 | 2021-11-02 | 霍煜 | Alternating current-direct current low-loss voltage division driving device and application method |
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| CN101719727A (en) * | 2009-12-14 | 2010-06-02 | 北京理工大学 | dc-dc converter |
| CN204633635U (en) * | 2015-01-12 | 2015-09-09 | 苏州大学 | Electric spark power supply |
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| 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 |
| CN101557172A (en) * | 2009-05-19 | 2009-10-14 | 南京航空航天大学 | Input interleaved series forward DC-DC converter |
| CN101719727A (en) * | 2009-12-14 | 2010-06-02 | 北京理工大学 | dc-dc converter |
| CN204633635U (en) * | 2015-01-12 | 2015-09-09 | 苏州大学 | Electric spark power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109756118A (en) * | 2017-11-02 | 2019-05-14 | 山东朗进科技股份有限公司 | A kind of double-ended power translation circuit |
| CN109194144A (en) * | 2018-08-10 | 2019-01-11 | 合肥华耀电子工业有限公司 | A kind of double positive activation type booster circuits of crisscross parallel |
| CN113595366A (en) * | 2021-06-18 | 2021-11-02 | 霍煜 | Alternating current-direct current low-loss voltage division driving device and application method |
| CN113595366B (en) * | 2021-06-18 | 2024-05-14 | 霍煜 | AC/DC low-loss voltage division driving device and application method |
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Application publication date: 20150408 |