CN102573163B - High-voltage power supply of electron beam melting furnace - Google Patents
High-voltage power supply of electron beam melting furnace Download PDFInfo
- Publication number
- CN102573163B CN102573163B CN2012100158139A CN201210015813A CN102573163B CN 102573163 B CN102573163 B CN 102573163B CN 2012100158139 A CN2012100158139 A CN 2012100158139A CN 201210015813 A CN201210015813 A CN 201210015813A CN 102573163 B CN102573163 B CN 102573163B
- Authority
- CN
- China
- Prior art keywords
- voltage
- phase
- regulatable reactor
- circuit
- winding
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Rectifiers (AREA)
- Particle Accelerators (AREA)
Abstract
The invention discloses a high-voltage power supply device of an electron beam melting furnace. According to the power supply disclosed by the invention, a current transformation way including power frequency alternating current input, voltage regulation by a three-phase adjustable reactor, boosting by a three-phase boosting transformer and high-voltage rectification and filtration is adopted for output; and output high-voltage sampled signals are taken as negative feedback signals, current of a direct current control winding of the three-phase adjustable reactor is controlled by a voltage regulator, and automatic voltage regulation is performed for keeping an output voltage value of the high-voltage power supply of the electron beam melting furnace stable. The power supply disclosed by the invention is based on the control of the controllable reactor and has the characteristics of high efficiency, small public nuisance and capability of fast and effectively suppressing discharge current during discharge of the high-voltage power supply.
Description
Technical field
The present invention relates to the electron beam electroheat equipment, be specially the electron beam furnace high-voltage power apparatus.
Background technology
Electron beam furnace is a kind of electroheat equipment that the heat energy that produces when utilizing high-velocity electrons bombardments furnace charge carries out melting and heating, it is a kind of physical vacuum that combines, material science, electronic technology, electron optics, high voltage technique, the high-tech product of multiple technologies such as computer and control technology, compare with other vacuum melting furnace, the power density height, can be used for valuable, rare, the melting of refractory metal and concise, vacuum degree height in the stove, prepare various high-purity materials or specific alloy easily and be used for melting high-quality special steel and the recovery of titanium scrap etc., have the advantage that no refractory material pollutes furnace charge in addition.The developing direction of beam bombardment stove is high-power, multiple gun, and the separate unit power of this kind equipment has reached 2400kW.Particularly nearly 30 years electron beam cold hearth melting (EBCHM) technology in the production of high-quality titanium or titanium alloy ingot blank in occupation of consequence.
The characteristics of electron beam furnace high voltage source control method and supply unit are at present:
1) the electron beam high voltage source is the closed loop voltage-stabilizing system, namely utilizes thyristor phase shift AC voltage adjusting to control the input voltage of main transformer automatically, makes the accelerating power source output voltage keep stable.Shortcoming is: 1. thyristor phase shift AC voltage adjusting, electrical network there is pollution, and the EMC index is difficult to up to standard, and power factor is low; 2. the step-up transformer input voltage waveform of thyristor phase shift AC voltage adjusting accelerating power source is the non-sinusoidal waveform that contains high order harmonic component; In order to guarantee the regulated quantity requirement, the Capacity design surplus of transformer is bigger, and utilance is low, and the loss that these all can increase transformer descends operational efficiency; 3. thyristor phase shift AC voltage adjusting power supply, the high direct voltage output ripple is bigger, and it is unfavorable that electron beam is focused on, and reduces the electronic beam current passband.
2) the electron beam high voltage source is open loop control, and namely high voltage source directly by the three-phase mains power supply, obtains through heterogeneous full-wave rectification, can overcome with the top shortcoming, can't suppress but the high-voltage operation process produces fluctuation.
The electron beam furnace running produces electric discharge phenomena in addition, thereby causes the voltage fluctuation and flicker that electrical network is violent, jeopardizes the normal operation of own and other electric equipments, and grid supply quality is brought serious harm.The above-mentioned two kinds of power supplys of electron beam furnace all lack effective inhibition ability to this " harm ".
Two problems are mainly considered in the design of electron beam furnace high voltage source:
1) improves the power supply operational efficiency, " public hazards " that when reducing the power supply operation electrical network produced.
2) power supply and control system thereof have the ability that suppresses fast and effectively to running generation electric discharge phenomena.
The electron beam furnace high voltage source adopts the three-phase full-wave power supply, and high-voltage rectifying adopts 12 pulse wave rectifier circuit, just can solve first problem better.For second problem, the output impedance (mainly being the leakage impedance of step-up transformer) that general employing suitably increases high voltage source reduces the electrion electric current, certainly will have influence on the deliquescing of high voltage source output characteristic like this.Needing like this increases transformer capacity, is that cost suppresses strength of discharge with sacrificial section efficient, and the problem that suppresses discharge does not in addition fast still solve.
Electron beam furnace high voltage source service requirement output voltage stabilization does not generally require the change operational voltage value in rated voltage.
Summary of the invention
Technical problem to be solved by this invention provides a kind of electron beam furnace high-voltage power apparatus, the present invention adopts the input of three-phase near sinusoidal ripple electric current, and based on controlled reactor control, have that efficient height, " public hazards " are little, can suppress the characteristics of discharging current during the high voltage source discharge rapidly, effectively.
Basic design of the present invention is that the electron beam furnace high voltage source adopts the output voltage closed loop controlling structure, and high voltage source is powered by the three-phase mains, regulates the primary side voltage of input high-tension transformer by the operating state of regulating Regulatable reactor.
The electron beam furnace high-voltage power apparatus that the present invention is designed mainly is made up of dc power supply circuit and the high pressure closed-loop control light current circuit of three-phase Regulatable reactor, three-phase voltage increasing transformer, two groups of high-voltage rectifying filter circuits, electrion choke circuit, high-pressure sampling circuit, three-phase Regulatable reactor DC control winding; The three-phase Regulatable reactor exchanges the input of winding and the three-phase mains of input joins, and the three-phase Regulatable reactor exchanges the output of winding and sends into three-phase voltage increasing transformer first side winding; The dc power supply circuit of three-phase Regulatable reactor DC control winding and three-phase Regulatable reactor DC control winding joins; The three-phase voltage increasing transformer has two groups of secondary side winding, is respectively delta connection and star connection, and the line voltage of two groups of secondary side winding is identical; The output of two groups of secondary side winding of three-phase voltage increasing transformer inserts two groups of high-voltage rectifying filter circuits respectively; Every group of high-voltage rectifying filter circuit is made up of a high-voltage rectifying bridge and a high-voltage capacitance, and high-voltage capacitance is connected on the high-voltage rectifying bridge output; The interchange input side of the high-voltage rectifying bridge of two groups of high-voltage rectifying filter circuits joins with two groups of secondary side winding of three-phase voltage increasing transformer respectively, the high-voltage capacitance series connection back output of two groups of high-voltage rectifying filter circuits; The high-pressure side of high-voltage rectifying filter circuit output joins via the negative electrode of electrion choke circuit and electron gun, and the low-pressure end of high-voltage rectifying filter circuit output and the anode of the earth and electron gun join; The high-pressure sampling circuit is connected between electrion choke circuit output and the earth, and the high-pressure sampling signal of high-pressure sampling circuit output is sent into the input of voltage close loop control circuit; The dc power supply circuit of the output of high pressure closed-loop control light current circuit and three-phase Regulatable reactor DC control winding joins.
Described high pressure closed-loop control light current circuit comprises the given signal generator of high pressure, comparator, high pressure regulator and drive circuit; The output of the given signal generator of high pressure is set by digital-to-analogue conversion by the central control unit numeral and is produced, and the output signal of the given signal generator of high pressure is sent into comparator as the given signal of high pressure; Comparator receives the high-pressure sampling signal of high-pressure sampling circuit output simultaneously, and the high voltage difference signal that the given signal of high pressure and high-pressure sampling signal relatively obtain is sent into high pressure regulator; High pressure regulator is the proportional-integral controller structure, and the high voltage difference signal that receives is carried out outputing control signals to after ratio-integral operation the duty ratio that drive circuit removes to regulate the dc power supply circuit output voltage ripple of three-phase Regulatable reactor DC control winding.
Described three-phase Regulatable reactor is made up of 3 identical single-phase Regulatable reactor of structure; The iron core of each single-phase Regulatable reactor is three rod structures, about be symmetrical structure, the core limb area of section of the left and right sides is identical with the yoke heart area of section of both sides up and down, but the core limb area of section of the left and right sides and up and down the area of section of the yoke heart of both sides all less than the core limb area of section at center; The interchange winding of single-phase Regulatable reactor is on the core limb at center, and the DC control winding symmetry of single-phase Regulatable reactor is on the core limb of the left and right sides; In the three-phase mains that the interchange winding of 3 single-phase Regulatable reactor is serially connected in industrial frequency AC input respectively and the first side winding of three-phase voltage increasing transformer, the DC control winding serial connection back of 3 single-phase Regulatable reactor and the dc power supply of three-phase Regulatable reactor DC control winding join.
Connect with a linear reactor again after the DC control winding serial connection of 3 single-phase Regulatable reactor, receive the output of the dc power supply of three-phase Regulatable reactor DC control winding at last.
Above-mentioned electron beam furnace high-voltage power apparatus also further comprises electronic beam current sample resistance and current transducer; Wherein the electronic beam current sample resistance is serially connected between the low-pressure end and the earth of high-voltage rectifying filter circuit output, the current transducer input is serially connected between three-phase Regulatable reactor and the three-phase voltage increasing transformer, electronic beam current sampled signal on the electronic beam current sample resistance, three-phase voltage increasing transformer imput current sampled signal on the current transducer, and the high-pressure sampling signal of high-pressure sampling circuit output sends into the input of the fault locking signal generator in the central control unit of high pressure closed-loop control light current circuit, and the output of fault locking signal generator links to each other with high pressure regulator.
The dc power supply circuit of described three-phase Regulatable reactor DC control winding comprises Buck voltage regulator circuit and lower pressure rectifier filter circuit; Wherein the lower pressure rectifier filter circuit comprises lower pressure rectifier bridge and low-voltage capacitance; The Buck voltage regulator circuit comprises power switch pipe and low pressure fly-wheel diode; The ac input end of lower pressure rectifier bridge is inserted in the three-phase mains, and the direct current outlet side of lower pressure rectifier bridge is attempted by the two ends of low-voltage capacitance; The collector electrode of the anode access power switching tube of the DC power supply behind the above-mentioned lower pressure rectifier filter circuit rectifying and wave-filtering of process, negative terminal inserts the anode of low pressure fly-wheel diode; The negative electrode of low pressure fly-wheel diode and the emitter of power switch pipe join; The output of the base stage of power switch pipe and high pressure closed-loop control light current circuit joins; The anode of low pressure fly-wheel diode and negative electrode are connected on respectively on the two ends of three-phase Regulatable reactor DC control winding.
The characteristics of electron beam furnace high voltage source of the present invention are:
1) the high-tension transformer input voltage is sine voltage, and high-voltage rectifying adopts 12 pulse wave rectifiers, high-tension transformer input current near sinusoidal ripple electric current.Possess higher power factor and efficient, reduced harmonic current simultaneously.
2) series connection three-phase Regulatable reactor has the current limiting characteristic of nature, and response speed do not have delay, can realize fast, effectively suppress the ability of electrion.
3) three-phase Regulatable reactor running has certain electric energy loss, but the application of high-performance core material has reduced much loss, adds that energy-conservation that first characteristics are brought will enough offset the loss of Regulatable reactor.
Description of drawings
Fig. 1 is electron beam furnace high-voltage power apparatus example structure schematic diagram of the present invention.
Fig. 2 is three-phase Regulatable reactor structural representation among Fig. 1.
Fig. 3 is the single-phase Regulatable reactor operation of three-phase Regulatable reactor flux change schematic diagram among Fig. 1.
Embodiment
The control method of a kind of electron beam furnace high voltage source of the present invention, its high voltage source adopts the output voltage closed loop controlling structure, by the three-phase mains power supply, regulates the primary side voltage of input high-tension transformer by the operating state of regulating controlled reactor.Described power supply adopt industrial frequency AC input → three-phase Regulatable reactor L1 pressure regulation → three-phase voltage increasing transformer T boost → the current transformation mode of high-voltage rectifying filtering exports; The high-pressure sampling signal of above-mentioned output high pressure as negative-feedback signal, is removed to control the electric current of three-phase Regulatable reactor L1 DC control winding by voltage regulator, carry out automatic Regulation, make electron beam furnace high voltage source output voltage values keep stable.
The concrete grammar that above-mentioned electron beam furnace high voltage source output voltage automatic stabilisation is regulated is that the given signal of high pressure and high-pressure sampling signal that the given signal generator of high pressure produces are relatively obtained the high voltage difference signal, the high voltage difference signal is sent into high pressure regulator and is carried out output one control signal after ratio-integral PI computing, sends into the duty ratio of power tube in the dc power supply loop that drive circuit removes to regulate three-phase Regulatable reactor L1 DC control winding with the control signal of high pressure regulator output.
The control method of electron beam furnace high voltage source also further includes error protection control; Namely the high-pressure sampling signal in the high voltage source control procedure is carried out the overvoltage fault distinguishing, electronic beam current sampled signal and three-phase voltage increasing transformer T input current sampled signal are carried out the over current fault differentiation respectively; above-mentioned arbitrary fault produces; block the output of high pressure regulator immediately, and realize multiple protective and the chain control of complete machine logic of high voltage source by the electron beam furnace central control unit.
Described three-phase Regulatable reactor L1 is made up of 3 identical single-phase Regulatable reactor of structure.The iron core of each single-phase Regulatable reactor is three rod structures, about be symmetrical structure, the core limb area of section of the left and right sides is identical with the yoke heart area of section of both sides up and down, but the core limb area of section of the left and right sides and up and down the area of section of the yoke heart of both sides all less than the core limb area of section at center.The interchange winding of single-phase Regulatable reactor is on the core limb at center, and the DC control winding symmetry of single-phase Regulatable reactor is on the core limb of the left and right sides.Single-phase Regulatable reactor DC control winding feed the magnetic flux that produces behind the electric current by the core limb of the left and right sides and up and down the both sides yoke be formed centrally the loop, the core limb by the center not.Single-phase Regulatable reactor exchanges winding and feeds the magnetic flux that produces behind the electric current and form 2 loops with the core limb of the left and right sides from the core limb at center respectively by the both sides yoke heart up and down.After the interchange winding of single-phase Regulatable reactor feeds alternating current, respectively there is the magnetic flux of a side core limb to be strengthened in positive-negative half-cycle, and the magnetic flux of opposite side core limb will be weakened, to respond to the opposite induced electromotive force of Semi-polarity respectively in the two DC control windings, but because the non-linear two induced electromotive force amplitudes of magnetic circuit have difference, still there is the part induced electromotive force after the stack.
In the three-phase mains that the interchange winding of 3 single-phase Regulatable reactor is serially connected in industrial frequency AC input respectively and the first side winding of three-phase voltage increasing transformer T, the DC control winding serial connection back of 3 single-phase Regulatable reactor and the dc power supply of three-phase Regulatable reactor L1 DC control winding join.When three-phase Regulatable reactor L1 passes through symmetrical current, according to the symmetrical three phase circuit characteristic, the total induced electromotive force of the DC control winding of three-phase Regulatable reactor L1 is 0, so the electric current that the electric current that exchanges winding among the three-phase Regulatable reactor L1 can not influence the DC control winding changes.Change the electric current of DC control winding among the three-phase Regulatable reactor L1, make the every equivalent reactance of three-phase alternating current winding change by same rule.During specified operation, the DC control winding produces a very strong D.C. magnetic field, make left and right sides core limb and up and down the both sides yoke core degree of depth is saturated, exchange the specified alternating current that winding flows through, by exchanging AC magnetic field deficiency that winding produces so that iron core withdraws from saturated, magnetic circuit presents very big magnetic resistance, passes the magnetic flux that exchanges winding and the induced electromotive force that exchanges the winding two ends is all very little, and line voltage almost is added on the first side winding of step-up transformer entirely.
Electron beam furnace is in running, in case generation electric discharge phenomena, be equivalent to the high voltage source fault that is short-circuited, then bigger short circuit current flows through three-phase Regulatable reactor L1 interchange winding, make the both sides iron core column of each single-phase Regulatable reactor alternately withdraw from the saturation region in positive-negative half-cycle, three-phase Regulatable reactor L1 presents very big reactance, thereby limiting short-circuit current makes three-phase Regulatable reactor L1 have current limiting characteristic; If three-phase circuit is asymmetric, in three-phase Regulatable reactor L1 DC control winding, will induce alternating current, produce transformer action, thereby reduce the flickering inhibition of three-phase Regulatable reactor L1, in order to remedy this defective, the present invention is linear reactor L2 of series connection in the DC control winding loop of three-phase Regulatable reactor L1 also.When zero load or light running, the control direct current of three-phase Regulatable reactor L1 is less, the shallow degree of iron core is saturated or work in linear zone, the alternating current that the interchange winding flows through is less, by exchanging AC magnetic field deficiency that winding produces so that iron core to enter the degree of depth saturated, magnetic circuit presents less magnetic resistance, passes the magnetic flux that exchanges winding and the induced electromotive force that exchanges the winding two ends is all bigger, and line voltage has part consumption on the interchange winding of three-phase Regulatable reactor L1.
According to the designed electron beam furnace high-voltage power apparatus of said method as shown in Figure 1, it mainly is made up of dc power supply circuit and the high pressure closed-loop control light current circuit of three-phase Regulatable reactor L1, current transducer TA, three-phase voltage increasing transformer T, two groups of high-voltage rectifying filter circuits, electrion choke circuit, high-pressure sampling circuit, electronic beam current sample resistance R3, three-phase Regulatable reactor L1 DC control winding.
Described three-phase Regulatable reactor L1 is made up of 3 identical single-phase Regulatable reactor of structure as shown in Figure 2.The iron core of each single-phase Regulatable reactor is three rod structures, about be symmetrical structure, the core limb area of section of the left and right sides is identical with the yoke heart area of section of both sides up and down, but the core limb area of section of the left and right sides and up and down the area of section of the yoke heart of both sides all less than the core limb area of section at center.The interchange winding of single-phase Regulatable reactor is on the core limb at center, and the DC control winding symmetry of single-phase Regulatable reactor is on the core limb of the left and right sides.Single-phase Regulatable reactor DC control winding feed the magnetic flux that produces behind the electric current by the core limb of the left and right sides and up and down the both sides yoke be formed centrally the loop, the core limb by the center not.Single-phase Regulatable reactor exchanges winding and feeds the magnetic flux that produces behind the electric current and form 2 loops with the core limb of both sides from the core limb at center respectively by the both sides yoke heart up and down.After the interchange winding of single-phase Regulatable reactor feeds alternating current, respectively there is the magnetic flux of a side core limb to be strengthened in positive-negative half-cycle, and the magnetic flux of opposite side core limb will be weakened, to respond to the opposite induced electromotive force of Semi-polarity respectively in the two DC control windings, but because the non-linear two induced electromotive force amplitudes of magnetic circuit have difference, still there is the part induced electromotive force after the stack.
In the three-phase mains that the interchange winding of 3 single-phase Regulatable reactor is serially connected in industrial frequency AC input respectively and the first side winding of three-phase voltage increasing transformer T, the DC control winding serial connection back of 3 single-phase Regulatable reactor and the dc power supply of three-phase Regulatable reactor L1 DC control winding join.When three-phase Regulatable reactor L1 passes through symmetrical current, according to the symmetrical three phase circuit characteristic, the total induced electromotive force of the DC control winding of three-phase Regulatable reactor L1 is 0, so the electric current that the electric current that exchanges winding among the three-phase Regulatable reactor L1 can not influence the DC control winding changes.Change the electric current of DC control winding among the three-phase Regulatable reactor L1, make the every equivalent reactance of three-phase alternating current winding change by same rule.During specified operation, the DC control winding produces a very strong D.C. magnetic field, make the iron core degree of depth saturated (Q point among Fig. 3), exchange the specified alternating current that winding flows through, by exchanging AC magnetic field deficiency that winding produces so that iron core withdraws from saturated, magnetic circuit presents very big magnetic resistance, passes the magnetic flux that exchanges winding and the induced electromotive force that exchanges the winding two ends is all very little, and line voltage almost is added on the first side winding of step-up transformer entirely.
Electron beam furnace is in running, in case generation electric discharge phenomena, be equivalent to the high voltage source fault that is short-circuited, then bigger short circuit current flows through three-phase Regulatable reactor L1 interchange winding, make the both sides iron core column of each single-phase Regulatable reactor alternately withdraw from the saturation region in positive-negative half-cycle, three-phase Regulatable reactor L1 presents very big reactance, thereby limiting short-circuit current makes three-phase Regulatable reactor L1 have current limiting characteristic; If three-phase circuit is asymmetric, in three-phase Regulatable reactor L1 DC control winding, will induce alternating current, produce transformer action, thereby reduce the flickering inhibition of three-phase Regulatable reactor L1, in order to remedy this defective, the present invention is linear reactor L2 of series connection in the DC control winding loop of three-phase Regulatable reactor L1 also.When zero load or light running, the control direct current of three-phase Regulatable reactor L1 is less, the shallow degree of iron core is saturated or work in linear zone (S point among Fig. 3), the alternating current that the interchange winding flows through is less, by exchanging AC magnetic field deficiency that winding produces so that iron core to enter the degree of depth saturated, magnetic circuit presents less magnetic resistance, passes the magnetic flux that exchanges winding and the induced electromotive force that exchanges the winding two ends is all bigger, and line voltage has part consumption on the interchange winding of three-phase Regulatable reactor L1.
The input of current transducer TA is serially connected between three-phase Regulatable reactor and the three-phase voltage increasing transformer, for detection of three-phase voltage increasing transformer T input current, the d. c. voltage signal I of its output～be that three-phase voltage increasing transformer imput current sampled signal is proportional to three-phase voltage increasing transformer T input current, detect d. c. voltage signal I～the send into input of the central control unit of high pressure closed-loop control light current circuit, central control unit is d. c. voltage signal I～compare with its amplitude limit set point, if surpass the amplitude limit set point, central control unit is judged generation input over current fault.
Three-phase voltage increasing transformer T has two groups of secondary side winding, be respectively delta connection and star connection, and the line voltage of two groups of secondary side winding is identical, and the output of two groups of secondary side winding inserts the input side that exchanges of the first high-voltage rectifying filter circuit and the second high-voltage rectifying filter circuit mesohigh rectifier bridge ZL3 and ZL4 respectively; Two groups of high-voltage rectifying bridge ZL3 and ZL4 output series connection output again after high-voltage capacitance C1 and C2 filtering respectively, the negative high-voltage end of output is connected to the input of electrion choke circuit, low-pressure end joins through electronic beam current sample resistance R3 and the earth, and the anode of electron gun also joins with the earth.
Chokes reactor L3 and high pressure sustained diode 2 compose in parallel the electrion choke circuit.The anode of high pressure sustained diode 2 is input, and the negative electrode of high pressure sustained diode 2 is output, and this output is connected to the negative electrode of electron gun.The effect of chokes reactor L3 is the discharge immediate current of restriction high-voltage capacitance C1 and C2.The effect of high pressure sustained diode 2 is to prevent that discharging current from terminating in that chokes reactor L3 two ends produce overvoltage.
High pressure drop piezoresistance R1 and high-voltage sampling resistance R2 are composed in series the high-pressure sampling circuit.The high-pressure sampling circuit is connected between electrion choke circuit output and the earth.The high-pressure sampling signal U of high-voltage sampling resistance R2 output sends into comparator and the central control unit of high tension voltage closed-loop control light current circuit respectively; Central control unit compares high-pressure sampling signal U and its amplitude limit set point, if surpass the amplitude limit set point, central control unit is judged generation high pressure overvoltage fault.
Electronic beam current sample resistance R3 goes up electronic beam current sampled signal I and sends into electronic beam current conditioning signal and central control unit respectively; Central control unit compares electronic beam current sampled signal I and its amplitude limit set point, if surpass the amplitude limit set point, central control unit is judged generation electronic beam current over current fault.
High pressure closed-loop control light current circuit comprises central control unit, comparator, high pressure regulator and drive circuit.
Central control unit can form the given signal generator of high pressure and fault locking signal generator.Central control unit forms the given signal generator of high pressure in the following manner: the output of the given signal generator of high pressure is set by digital-to-analogue conversion by the central control unit numeral and is produced, and the output signal of the given signal generator of high pressure is sent into comparator as the given signal of high pressure.Central control unit forms fault locking signal generator in the following manner: the electronic beam current sampled signal on the electronic beam current sample resistance R3 and the three-phase voltage increasing transformer T input current sampled signal on the current transducer TA are sent into central control unit and are carried out the over current fault differentiation, and the high-pressure sampling signal of high-pressure sampling circuit output is sent into central control unit and carried out the overvoltage fault distinguishing.Above-mentioned arbitrary fault produces, and central control unit is exported fault-signal U immediately
ErTo high pressure regulator, block the output of high pressure regulator immediately, and realize multiple protective and the chain control of complete machine logic of high voltage source by the electron beam furnace central control unit.
Comparator receives the given signal U of high pressure of central control unit output
*With high-pressure sampling signal U, compare computing, output high voltage difference signal delta U=U
*-U, high voltage difference signal delta U sends into the input of high pressure regulator.
High pressure regulator is the proportional-integral controller structure, and high pressure regulator carries out ratio-integration (PI) computing to deviation signal Δ U, exports a control signal U
cSend into the input of driver element; High pressure regulator receives the fault locking signal U of central control unit output simultaneously
ErIn case, U
ErEffectively, the output of high pressure regulator will be blocked.
Driver element is used for dc control signal U
cConvert duty ratio and U to
cThe pulse signal that is directly proportional, and the control utmost point that is connected to the dc power supply circuit power switch pipe V of three-phase Regulatable reactor L1 DC control winding after the pulse signal amplification isolation.
Power switch pipe V and low pressure sustained diode 1 are formed the Buck voltage regulator circuit.Lower pressure rectifier bridge ZL1 and low-voltage capacitance C3 form the lower pressure rectifier filter circuit.Buck voltage regulator circuit and lower pressure rectifier filter circuit are formed the dc power supply circuit of three-phase Regulatable reactor L1 DC control winding.The three-phase mains power supply is exported straight uncontrollable DC power supply behind lower pressure rectifier filter circuit shaping filter.The direct current pulse power source that Buck voltage regulator circuit output duty cycle is controlled.
The ac input end of lower pressure rectifier bridge ZL1 is inserted in the three-phase mains, and the direct current outlet side of lower pressure rectifier bridge ZL1 is attempted by the two ends of low-voltage capacitance C3.The collector electrode of the anode access power switching tube V of the DC power supply behind the above-mentioned lower pressure rectifier filter circuit rectifying and wave-filtering of process, negative terminal inserts the anode of low pressure sustained diode 1.The anode of low pressure sustained diode 1 joins with three-phase Regulatable reactor L1 DC control winding one input again.The negative electrode of the emitter of power switch pipe V and low pressure sustained diode 1 joins, and the negative electrode of low pressure sustained diode 1 joins with the input of linear reactor L2 again.The output of linear reactor L2 and another input of three-phase Regulatable reactor L1 DC control winding join.The voltage waveform at low pressure sustained diode 1 two ends is the controlled dc pulse voltage ripple of duty ratio, more than the pulse frequency 10kHz, because the filter action of linear reactor L2 and three-phase Regulatable reactor L1 DC control winding, the current wave in the three-phase Regulatable reactor L1 DC control winding is approximate straight current wave.
Three-phase Regulatable reactor L1 is made up of three identical single-phase Regulatable reactor of structure in above-described embodiment; but protection of the present invention is not limited to above-mentioned three-phase Regulatable reactor L1; as long as the electron beam furnace high-voltage power apparatus adopts the series adjustable reactor voltage regulating mode, namely belong within protection scope of the present invention.
Claims (5)
1. electron beam furnace high-voltage power apparatus is characterized in that: mainly be made up of dc power supply circuit and the high pressure closed-loop control light current circuit of three-phase Regulatable reactor (L1), three-phase voltage increasing transformer (T), two groups of high-voltage rectifying filter circuits, electrion choke circuit, high-pressure sampling circuit, three-phase Regulatable reactor (L1) DC control winding;
Three-phase Regulatable reactor (L1) exchanges the input of winding and the three-phase mains of input joins, and three-phase Regulatable reactor (L1) exchanges the output of winding and sends into three-phase voltage increasing transformer (T) first side winding; The dc power supply circuit of three-phase Regulatable reactor (L1) DC control winding and three-phase Regulatable reactor (L1) DC control winding joins;
Three-phase voltage increasing transformer (T) has two groups of secondary side winding, is respectively delta connection and star connection, and the line voltage of two groups of secondary side winding is identical; The output of two groups of secondary side winding of three-phase voltage increasing transformer (T) inserts two groups of high-voltage rectifying filter circuits respectively;
Every group of high-voltage rectifying filter circuit is made up of a high-voltage rectifying bridge (ZL3 and ZL4) and a high-voltage capacitance (C1 and C2), and high-voltage capacitance (C1 and C2) is connected on high-voltage rectifying bridge (ZL3 and the ZL4) output; The input side that exchanges of the high-voltage rectifying bridge of two groups of high-voltage rectifying filter circuits (ZL3 and ZL4) joins with two groups of secondary side winding of three-phase voltage increasing transformer (T) respectively, the high-voltage capacitance of two groups of high-voltage rectifying filter circuits (C1 and C2) series connection back output;
The high-pressure side of high-voltage rectifying filter circuit output joins via the negative electrode of electrion choke circuit and electron gun, and the low-pressure end of high-voltage rectifying filter circuit output and the anode of the earth and electron gun join;
The high-pressure sampling circuit is connected between electrion choke circuit output and the earth, and the high-pressure sampling signal of high-pressure sampling circuit output is sent into the input of voltage close loop control light current circuit;
The dc power supply circuit of the output of high pressure closed-loop control light current circuit and three-phase Regulatable reactor (L1) DC control winding joins;
Above-mentioned high pressure closed-loop control light current circuit comprises the given signal generator of high pressure, comparator, high pressure regulator and drive circuit;
The output of the given signal generator of high pressure is set by digital-to-analogue conversion by the central control unit numeral and is produced, and the output signal of the given signal generator of high pressure is sent into comparator as the given signal of high pressure;
Comparator receives the high-pressure sampling signal of high-pressure sampling circuit output simultaneously, and the high voltage difference signal that the given signal of high pressure and high-pressure sampling signal relatively obtain is sent into high pressure regulator;
High pressure regulator is the proportional-integral controller structure, and the high voltage difference signal that receives is carried out outputing control signals to after ratio-integral operation the duty ratio that drive circuit removes to regulate the dc power supply circuit output voltage ripple of three-phase Regulatable reactor (L1) DC control winding.
2. electron beam furnace high-voltage power apparatus according to claim 1, it is characterized in that: described three-phase Regulatable reactor (L1) is made up of 3 identical single-phase Regulatable reactor of structure; The iron core of each single-phase Regulatable reactor is three rod structures, about be symmetrical structure, the core limb area of section of the left and right sides is identical with the yoke heart area of section of both sides up and down, but the core limb area of section of the left and right sides and up and down the area of section of the yoke heart of both sides all less than the core limb area of section at center; The interchange winding of single-phase Regulatable reactor is on the core limb at center, and the DC control winding symmetry of single-phase Regulatable reactor is on the core limb of the left and right sides; In the three-phase mains that the interchange winding of 3 single-phase Regulatable reactor is serially connected in industrial frequency AC input respectively and the first side winding of three-phase voltage increasing transformer (T), the DC control winding serial connection back of 3 single-phase Regulatable reactor and the dc power supply of three-phase Regulatable reactor (L1) DC control winding join.
3. electron beam furnace high-voltage power apparatus according to claim 2, it is characterized in that: connect with a linear reactor (L2) again after the DC control winding serial connection of 3 single-phase Regulatable reactor, receive the output of the dc power supply of three-phase Regulatable reactor (L1) DC control winding at last.
4. electron beam furnace high-voltage power apparatus according to claim 1 is characterized in that: also further comprise electronic beam current sample resistance (R3) and current transducer (TA); Wherein electronic beam current sample resistance (R3) is serially connected between the low-pressure end and the earth of high-voltage rectifying filter circuit output, current transducer (TA) input is serially connected between three-phase Regulatable reactor (L1) and the three-phase voltage increasing transformer (T), electronic beam current sampled signal on the electronic beam current sample resistance (R3), three-phase voltage increasing transformer (T) input current sampled signal on the current transducer (TA), and the high-pressure sampling signal of high-pressure sampling circuit output sends into the input of the fault locking signal generator in the central control unit of high pressure closed-loop control light current circuit, and the output of fault locking signal generator links to each other with high pressure regulator.
5. electron beam furnace high-voltage power apparatus according to claim 1, it is characterized in that: the dc power supply circuit of described three-phase Regulatable reactor (L1) DC control winding comprises Buck voltage regulator circuit and lower pressure rectifier filter circuit; Wherein the lower pressure rectifier filter circuit comprises lower pressure rectifier bridge (ZL1) and low-voltage capacitance (C3); The Buck voltage regulator circuit comprises power switch pipe (V) and low pressure fly-wheel diode (D1); The ac input end of lower pressure rectifier bridge (ZL1) is inserted in the three-phase mains, and the direct current outlet side of lower pressure rectifier bridge (ZL1) is attempted by the two ends of low-voltage capacitance (C3); The collector electrode of the anode access power switching tube (V) of the DC power supply behind the above-mentioned lower pressure rectifier filter circuit rectifying and wave-filtering of process, negative terminal inserts the anode of low pressure fly-wheel diode (D1); The emitter of the negative electrode of low pressure fly-wheel diode (D1) and power switch pipe (V) joins; The output of the base stage of power switch pipe (V) and high pressure closed-loop control light current circuit joins; The anode of low pressure fly-wheel diode (D1) and negative electrode are connected on respectively on the two ends of three-phase Regulatable reactor (L1) DC control winding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100158139A CN102573163B (en) | 2012-01-18 | 2012-01-18 | High-voltage power supply of electron beam melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100158139A CN102573163B (en) | 2012-01-18 | 2012-01-18 | High-voltage power supply of electron beam melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102573163A CN102573163A (en) | 2012-07-11 |
| CN102573163B true CN102573163B (en) | 2013-08-21 |
Family
ID=46417307
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100158139A Expired - Fee Related CN102573163B (en) | 2012-01-18 | 2012-01-18 | High-voltage power supply of electron beam melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102573163B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103487617B (en) * | 2013-10-12 | 2016-08-17 | 国家电网公司 | Three-phase once logical pressure and the most through-flow device |
| CN104052252B (en) * | 2014-06-16 | 2017-05-03 | 桂林电子科技大学 | Electron beam acceleration power device and control method |
| CN105140916A (en) * | 2015-09-06 | 2015-12-09 | 桂林电子科技大学 | Electronic curtain accelerating power source apparatus |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1379419A (en) * | 1998-05-18 | 2002-11-13 | Nmb(美国)公司 | Variable inductor |
| CN1778496A (en) * | 2004-11-26 | 2006-05-31 | 中国科学院金属研究所 | Production and special apparatus for low-voltage pulse electric field of non tree-like-crystal and semi-solid alloy |
| CN2896680Y (en) * | 2006-05-19 | 2007-05-02 | 烟台冶金新材料研究所 | Three-phase power adjustable power supply for vacuum carbon tube furnace |
| CN200987128Y (en) * | 2006-12-25 | 2007-12-05 | 吴加强 | High performance controllable inductive reactance AC electric motor initiating means |
| CN101179878A (en) * | 2007-12-07 | 2008-05-14 | 桂林电子科技大学 | Power supply control method and power supply device for electron beam generating system of electron beam bombardment furnace |
| CN201563066U (en) * | 2009-11-18 | 2010-08-25 | 陈守君 | Electricity-saving power supply for electric resistance furnace |
| CN202551400U (en) * | 2012-01-18 | 2012-11-21 | 桂林电子科技大学 | High-voltage power supply device for electron-beam melting furnace |
-
2012
- 2012-01-18 CN CN2012100158139A patent/CN102573163B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1379419A (en) * | 1998-05-18 | 2002-11-13 | Nmb(美国)公司 | Variable inductor |
| CN1778496A (en) * | 2004-11-26 | 2006-05-31 | 中国科学院金属研究所 | Production and special apparatus for low-voltage pulse electric field of non tree-like-crystal and semi-solid alloy |
| CN2896680Y (en) * | 2006-05-19 | 2007-05-02 | 烟台冶金新材料研究所 | Three-phase power adjustable power supply for vacuum carbon tube furnace |
| CN200987128Y (en) * | 2006-12-25 | 2007-12-05 | 吴加强 | High performance controllable inductive reactance AC electric motor initiating means |
| CN101179878A (en) * | 2007-12-07 | 2008-05-14 | 桂林电子科技大学 | Power supply control method and power supply device for electron beam generating system of electron beam bombardment furnace |
| CN201563066U (en) * | 2009-11-18 | 2010-08-25 | 陈守君 | Electricity-saving power supply for electric resistance furnace |
| CN202551400U (en) * | 2012-01-18 | 2012-11-21 | 桂林电子科技大学 | High-voltage power supply device for electron-beam melting furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102573163A (en) | 2012-07-11 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP6399462B2 (en) | AC pressure regulating electronic switch | |
| CN101323048B (en) | Control method of electron-beam welder acceleration high-voltage power supply as well as power-supply apparatus | |
| Ladoux et al. | A comparative study of AC/DC converters for high-power DC arc furnace | |
| CN110350606B (en) | DC chopper power supply device and method for electric arc furnace | |
| CN103296919A (en) | Three-phase two-pulse-wave high-power pulse current power supply for electrolytic cells and power supplying method | |
| CN102510228A (en) | Digital high-frequency high-voltage power supply device of electron beam welding machine and control method thereof | |
| CN107579664A (en) | The continuous welding equipment LLC resonance inversions high voltage power supply of electron beam and control method | |
| CN102573163B (en) | High-voltage power supply of electron beam melting furnace | |
| CN109792811B (en) | Converter-fed electric arc furnace with capacitor means in the secondary circuit | |
| CN101510732B (en) | Control method for electron beam punching machine acceleration high-voltage power supply and power supply device | |
| CN106411149A (en) | Series-compensation-based all-solid-state chopper voltage-regulating circuit and voltage regulating method | |
| CN207251486U (en) | A kind of plasma micro-arc oxidation intermediate frequency power supply | |
| CN112467998A (en) | Energy density adjustable multi-working mode plasma power supply | |
| WO2018233833A1 (en) | A method for operating an electric-arc furnace, a power electronic converter, and an electric-arc furnace system | |
| CN202551400U (en) | High-voltage power supply device for electron-beam melting furnace | |
| CN202009335U (en) | Three-phase large-power low-voltage large-current high-frequency inverting and rectifying device | |
| CN111952987A (en) | Direct current electric arc furnace rectification power supply device and control method | |
| CN201380361Y (en) | Acceleration high-voltage power supply device for electron-beam drilling machine | |
| Ioan et al. | Comparative study for EAF's reactive energy compensation methods and power factor improvement | |
| CN102611329A (en) | High frequency inversion rectifying device for three-phase high-power low voltage and large current and method thereof | |
| CN103084724B (en) | Contravariant accelerating power supply device of electron beam depositing equipment and control method thereof | |
| CN207304383U (en) | The continuous welding equipment LLC resonance inversion high voltage power supplies of electron beam | |
| CN202600548U (en) | Active snubber soft switching power regulating circuit | |
| Iagăr et al. | Analysis the electrical parameters of a high-frequency coreless induction furnace | |
| CN206149150U (en) | All solid state chopper control circuit based on cascade compensation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130821 Termination date: 20160118 |
|
| EXPY | Termination of patent right or utility model |