CN212785193U - Combinable switch type power supply structure for arc plasma - Google Patents
Combinable switch type power supply structure for arc plasma Download PDFInfo
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- CN212785193U CN212785193U CN202020510068.5U CN202020510068U CN212785193U CN 212785193 U CN212785193 U CN 212785193U CN 202020510068 U CN202020510068 U CN 202020510068U CN 212785193 U CN212785193 U CN 212785193U
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Abstract
A combinable switch type power supply structure for arc plasma comprises a multi-winding split-phase rectifier transformer, a rectifier tube rectifier filter circuit and a follow-up inverter circuit, wherein the multi-winding split-phase rectifier transformer is connected with an alternating current power supply for supplying power according to the quantity of discharge channels required by use, the input three-phase alternating current voltage is converted into a plurality of groups of three-phase alternating current voltages with the same quantity and quantity as the discharge channels, the circuit input of the rectifier tube rectifier filter circuit is connected with one group of three phases output by the rectifier transformer, and the three-phase alternating current is rectified and filtered into flat direct current; the control unit comprises an output value of a given conditioning circuit which needs to be output for discharging and a real-time value of a sampling conditioning circuit which outputs voltage and current, the arc striking power supply is connected in series after being isolated and coupled with the high-frequency step-down transformer and a negative pole of the direct current output by the high-frequency rectification link, and the control unit is connected with the upper computer. The utility model discloses with main discharge power supply and the module of arcing power supply combination synthesis, can make up according to the discharge channel number in the use, the effectual defect of having solved the electric arc power based on prior art makes.
Description
Technical Field
The utility model relates to an electric arc plasma uses technical field, in particular to a can make up switch type power structure for electric arc plasma.
Background
In industrial production and application, the way of obtaining plasma is various, but mainly three are summarized: namely thermal ionization, light radiation ionization and discharge ionization. By the discharge ionization, plasma with concentrated energy, large heat and high temperature (up to 3 × 104K) can be generated, and is called arc plasma. The arc plasma exists as the fourth state of matter, and is a clean high-temperature heat source with wide application prospect due to the characteristics of high temperature and high electric-heat conversion efficiency, and is widely applied to the aviation industry, environmental protection, welding and nuclear physics experiments, new material manufacturing, plasma metallurgy, ultrafine powder production, plasma cutting, welding and spraying. In recent years, research on plasma technology mainly focuses on new fields such as celestial space, nuclear fusion energy, environmental protection, nuclear fission waste and medical waste treatment, and arc plasma provides a new way for treating high-risk solid pollutants due to the characteristics of high self temperature, good reaction activity and high energy density.
The provision of a high-performance power supply for generating an arc by gas discharge is the core in gas discharge research, is a key device in an electric-to-heat conversion process, is a key factor for obtaining correct results of arc plasma research, and has been widely researched at home and abroad. Gas discharge power sources have been used at home and abroad for many years: voltage-regulating single-phase or multi-phase AC power supply of voltage regulator, controllable AC power supply using thyristor AC voltage regulation, DC power supply using thyristor phase-shifting control, and electric welding machine power supply. Because the voltage-regulating type of the voltage regulator is single-phase or multi-phase, the alternating current power supply is not controlled and only manually regulated manually, and the function of quick closed-loop regulation is not provided; the thyristor phase-shift controlled AC voltage regulation or DC power supply has the advantages that the thyristor cannot be conducted because the impedance between two output discharge electrodes is very large before the gas is broken down to form plasma, and a high-power dummy load needs to be installed, so that the control and the application become very complicated; the electric arc welding machine power supply is directly used as an electric arc power supply, and because the type of the electric arc welding machine is certain, the highest output voltage and the maximum output current are basically constant values, so that the electric arc welding machine is inconvenient to use and large in size, and coordination control are difficult to complete in application occasions requiring multiple groups of discharge electrodes.
Disclosure of Invention
In order to solve the technical problem, the utility model aims to provide a can make up switch type power structure for arc plasma, with main discharge power and the module of arcing power supply combination, can make up according to the discharge channel number in the use, the effectual defect of solving the arc power based on prior art makes.
In order to realize the purpose, the utility model discloses a technical scheme is:
a combinable switch type power supply structure for arc plasma comprises 10 units of a given conditioning circuit 1, a sampling conditioning circuit 2 for output voltage and current, a rectifier transformer 3, a rectifier tube rectifier filter circuit 4, an inverter circuit 5, a control unit 6, a high-frequency step-down transformer and high-frequency rectification link 7, an arc striking power supply 8, a main discharge electrode 9 and an upper computer 11 which are output according to use requirements;
the multi-winding split-phase rectifier transformer 3 is connected with an alternating current power supply according to the quantity of discharge channels required by use, the input three-phase alternating current voltage is converted into a plurality of groups of three-phase alternating current voltages with the same quantity as the discharge channels, the circuit input of the rectifier tube rectifying and filtering circuit 4 is connected with one group of three phases output by the rectifier transformer 3, the three-phase alternating current is rectified and filtered into flat direct current and is supplied to a subsequent inverter circuit 5, PWM pulses output by a link are formed by the inverter circuit 5 according to the PWM pulses in the control unit 6, and are isolated and driven by a pulse driving and power amplifying circuit to be converted into alternating current voltage, and the alternating current voltage is supplied to a high-frequency step-down transformer and a high-frequency rectifying link 7 for step-down matching and high-;
the control unit 6 compares the output value of the given conditioning circuit 1 required to be output by discharging with the real-time value of the sampling conditioning circuit 2 outputting voltage and current to obtain a difference value, and performs operation adjustment according to the difference value to change the width of the PWM pulse;
the arc ignition power supply 8 is connected in series after being isolated and coupled with a high-frequency step-down transformer and a negative electrode of direct current output by the high-frequency rectification link 7, and the control unit 6 is connected with the upper computer 11.
The main discharge electrode 9 is formed by plasma, and a rectifier tube rectifying filter circuit 4, an inverter circuit 5, a control unit 6, a high-frequency step-down transformer and high-frequency rectifying link 7, an arc striking power supply 8 and an upper computer 11 are added between the main discharge electrode 9 and the multi-winding split-phase rectifier transformer 3.
The number of the electrodes of the high-frequency step-down transformer and the high-frequency rectification link 7 connected with each group of plasma main discharge electrodes 9 is 2, and the two electrodes are powered by a sub main discharge switch power supply and a sub arc striking power supply in a combined mode.
The multi-winding split-phase rectifier transformer 3 is connected with a triangle at one time, and can adopt an extension triangle or other connection modes at the second time to form a plurality of three-phase voltages with different phase-shifting angles, the multi-winding split-phase rectifier transformer 3 is connected with a plurality of rectifier tube rectifying and filtering units 4, and 12, 18, 24, 36, 48, 60 and 72 pulse waves are formed at the alternating current input side of a power grid during operation.
Rectifier tube rectification filter unit 4 output link to each other with inverter circuit 5, inverter circuit 5 can be single-phase half-bridge, single-phase full-bridge, complementary push-pull structure or three-phase full-bridge, inverter circuit 5 output links to each other with high frequency step down transformer and 7 inputs of high frequency rectification filter unit to control unit 6 inside drive circuit output PWM pulse's drive and control, the main switch device among the inverter circuit can be IGBT or MOSFET.
The control unit 6 is formed by combining a plurality of integrated circuits according to a designed circuit principle or is completed by combining a DSP (digital signal processor), a PLC (programmable logic controller) and a touch screen, the input of the control unit 6 is respectively connected with the given conditioning circuit 1 and the output voltage and current sampling conditioning circuit 2, and the output is connected with a driving electrode of a power electronic device in the inverter circuit 5.
The high-frequency step-down transformer and the high-frequency rectification link 7 are single-phase or three-phase, the output is connected with the main discharge electrode 9, and the negative electrode of the high-frequency step-down transformer and the high-frequency rectification link are connected in series after being isolated and coupled with the arc ignition power supply 8.
The arc striking power supply 8 adopts a structure that single-phase alternating current is rectified and then converted into high-frequency alternating current through bridge type inversion and then boosted, the alternating voltage frequency can be adjusted according to the use requirement, and the alternating voltage frequency change range is 3-20 kHz.
The arc striking power supply 8 adopts a structure that single-phase alternating current is rectified and then converted into high-frequency alternating current through bridge type inversion and then boosted, high-voltage direct current is obtained through voltage doubling rectification, different voltage doubling rectification stages are adopted according to different requirements of different gases on arc striking voltage during use, and the adjustable range of the arc striking voltage specification is 3-15 kV.
The main discharge electrode 9 comprises a sub-main discharge power supply and a sub-arcing power supply, n sets of sub-main discharge power supplies and n sets of arcing power supplies are combined according to the number n of discharge channels of the system, the combination of the n sets of sub-main discharge power supplies and the arcing power supplies jointly use an upper computer 11, and the upper computer 11 is communicated with a PLC in each set of sub-main discharge power supplies.
The utility model has the advantages that:
1. the utility model provides a combined switch type power supply structure for arc plasma, which adopts a direct current power supply in the form of a high-frequency switch power supply, and has stable arc and high heating efficiency due to the output of direct current;
2. the utility model provides a pair of can make up switch mode power structure for arc plasma, its control power adopts high performance control chip, and interference immunity is strong, control is accurate, response speed is fast, makes power output more stable.
3. The utility model provides a can make up switch type power supply structure for arc plasma, uses high frequency switch transform, and voltage doubling rectification striking, striking voltage can be according to the difference of discharge gas, and the striking is easy, easy operation;
4. the utility model provides a pair of can make up switch mode power structure for electric arc plasma, because of the design can make up modular structure, according to the different combination requirements of actual plasma source to discharge channel quantity in the use, can carry out the several combination, not only convenient to use has reduced the harmonic of pouring into the electric wire netting side moreover.
Drawings
Fig. 1 is a schematic diagram of a given conditioning circuit output on demand.
Fig. 2 is a schematic diagram of an output voltage and current sampling conditioning circuit.
Fig. 3 is a schematic diagram of a multi-winding split-phase rectifier transformer.
FIG. 4 is a schematic diagram of a rectifier and filter circuit.
Fig. 5 an inverter circuit.
Fig. 6 is a functional block diagram of a control unit.
Fig. 7 shows a high-frequency step-down transformer and a high-frequency rectifying link.
Fig. 8 is a schematic diagram of an arc ignition power supply.
FIG. 9 is a schematic diagram of a two-pole DC powered plasma discharge electrode.
Fig. 10 is a general functional block diagram of the system.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 10, the present invention provides a combinable switching power supply structure for arc plasma, comprising: the device comprises a given conditioning circuit 1, a sampling conditioning circuit 2 for output voltage and current, a multi-winding split-phase rectifier transformer 3, a rectifier tube rectifier filter circuit 4, an inverter circuit 5, a control unit 6, a high-frequency step-down transformer and high-frequency rectification link 7, an arc striking power supply 8 and a main discharge electrode 9 which are output according to use requirements.
The device comprises a given conditioning circuit 1, a sampling conditioning circuit 2 for output voltage and current, a multi-winding split-phase rectifier transformer 3, a rectifier tube rectifier filter circuit 4, an inverter circuit 5, a control unit 6, a high-frequency step-down transformer and high-frequency rectification link 7, an arc striking power supply 8, a main discharge electrode 9 and an upper computer 11 which are output according to use requirements, wherein the given conditioning circuit 1, the sampling conditioning circuit 2 for output voltage and current, the multi-winding split-phase rectifier transformer, the rectifier filter circuit 4. The specific working process is as follows: in a normal operation state without faults, a group of three-phase alternating-current voltages of the secondary windings of the split-phase transformer 3 are directly rectified into direct currents through the rectifier tube rectifying and filtering unit 4, the direct currents are output according to the use requirements by the given conditioning circuit 1, the pulse width of the PWM is set according to the requirement of the gas discharge electrode 9 powered by each group of two electrodes, the set value of the given conditioning circuit 1 and the actual value obtained by the output voltage and current sampling conditioning circuit 2 are compared and operated in the control system 6, further changing the pulse width of the IGBT driving conduction PWM in the inverter circuit 5, the inverter circuit 5 inverts the DC output from the rectifier tube rectifying and filtering unit 4 into corresponding AC, therefore, the high-frequency step-down transformer and the high-frequency rectification link 7 output the DC voltage with high and low levels, and closed-loop regulation is completed. Once an operation fault occurs, corresponding protection is performed according to a comparison result of a sampling value of the unit circuit 2 for sampling and conditioning the output voltage and the output current and a protection threshold value set in the control unit 6. The arc ignition power supply 8 is used for generating high-frequency direct-current high voltage of several kilovolts in a short time, is used in the initial section of the operation of the main power supply of the discharge electrode, enables gas to be broken down, provides preparation conditions for forming a current path between the output anode and the output cathode of the main power supply of the discharge electrode, can output proper voltage required by different gases, is connected in series after being isolated and coupled with the high-frequency step-down transformer and the cathode of the direct-current voltage output by the high-frequency rectification link 7, and is withdrawn from operation after the arc striking process is finished; the upper computer can be realized by an industrial control computer and is used for monitoring in the system, and the upper computer is communicated with a PLC in a control unit in each channel to complete protection parameter setting, protection monitoring, operation parameter and state recording.
The number of the electrodes connected with each group of plasma discharge electrodes by the main direct current power supply is 2. The two electrodes are powered by a sub-main discharge switch power supply and a sub-arc ignition power supply in a combined mode, and a system can be formed by a plurality of sub-combined power supply units according to the number of discharge channels required by users in use. (as shown in FIG. 9)
The secondary winding split-phase rectifier transformer 3 can be provided with a plurality of mutually isolated three-phase windings with the same number as that of discharge channels, different wiring modes can be adopted among the three-phase windings, so that the three-phase windings are correspondingly different from each other by certain angles (including 30 degrees, 20 degrees, 15 degrees, 10 degrees, 7.5 degrees and 3.75 degrees … …), and are connected with a plurality of rectifier tube rectifying and filtering units 4, and 12, 18, 24, 36, 48, 60 and 72 pulses are formed on the alternating current input side of a power grid during operation, so that very low harmonic waves and high power factors are ensured.
The output of the rectifier tube rectifying and filtering unit 4 is connected with an inverter circuit 5, the inverter circuit 5 can be a single-phase half-bridge, a single-phase full-bridge, a complementary push-pull structure or a three-phase full-bridge, the output of the inverter circuit is connected with the input of a high-frequency step-down transformer and a high-frequency rectifying and filtering unit 7 and is driven and controlled by a PWM pulse output by a driving circuit in the control unit 6, a main switching element in the inverter circuit can be an IGBT or an MOSFET, and the change of the direct current voltage and the current finally applied to the two ends of the discharge electrode is realized only by the change regulation of the PWM pulse width in the operation;
the control unit 6 can be formed by combining a plurality of integrated circuits according to a designed circuit principle, can also be formed by combining a DSP (digital signal processor), a PLC (programmable logic controller) and a touch screen, and can also be realized by other modes; the input of the inverter is respectively connected with a given conditioning circuit 1 and an output voltage and current sampling conditioning circuit 2, the output of the inverter is connected with a driving electrode of a power electronic device in an inverter circuit 5, and the inverter internally comprises a closed-loop regulator, a monitoring protection link and a PWM pulse driving link;
the control unit 6 compares and analyzes the output value of the given conditioning circuit 1 required to be output by discharging with the real-time value of the sampling conditioning circuit 2 outputting voltage and current (the circuit inputs the detection results of the voltage and current sensors output by the high-frequency rectification link), obtains a difference value, performs proportional-integral-differential operation on the difference value, and adjusts the width of PWM (pulse-width modulation) pulse according to the calculation result, thereby finally controlling the on-time of the IGBT (insulated gate bipolar translator) in the inverter circuit and achieving the purpose of adjusting the output voltage or current;
it should be fully noted that the control unit 6 also monitors the running state information of the main discharging power supply, and applies real-time detection and judgment on the output voltage and current acquisition and sampling result of the high-frequency rectification link, the running temperature of the radiator and the running state of the cooling fan, and gives an alarm and protection processing in time once a fault occurs.
A high-frequency step-down transformer and high-frequency rectification link 7 for performing the functions of step-down, isolation, matching and conversion from high-frequency alternating current to direct current, wherein the circuit topology can be single-phase or three-phase, a rectification element is used as a high-frequency rectification tube, the output of the high-frequency rectification tube is connected with a main discharge electrode 9, and the negative electrode of the high-frequency rectification tube is connected with an arc ignition power supply in series after being isolated and coupled;
the discharge electrodes of each discharge channel are two, a given conditioning circuit 1 which needs to be output according to use requirements, a conditioning circuit 2 for sampling output voltage and current, a multi-winding split-phase rectifier transformer 3, a rectifier tube rectifier filter circuit 4, an inverter circuit 5, a control unit 6, a high-frequency step-down transformer, a high-frequency rectifier link 7 and an arc striking power supply 8 are set into one set of 8 links in total, n sets of the 8 links are selected according to the number n (n is 1, 2, 3, 4 and 5 … …) of the pairs of the discharge electrodes actually needed in use, the combination is convenient, and the combination units n sets commonly use one upper computer, so that the requirements of different capacities and different use occasions are met, and the flexibility is high;
the arc striking power supply is relatively low in power, a structure that single-phase alternating current is rectified and then converted into high-frequency alternating current through bridge type inversion and then boosted is adopted, the frequency of alternating voltage can be adjusted according to use requirements, and the frequency of the alternating voltage can be set between 3 kHz and 20kHz usually.
The arc striking power supply is relatively low in power, a structure that single-phase alternating current is rectified and then converted into high-frequency alternating current through bridge type inversion and then boosted is adopted, high-voltage direct current is obtained through voltage doubling rectification, different voltage doubling rectification stages are adopted according to different requirements of different gases on arc striking voltage during use, and the arc striking voltage can be divided into a plurality of specifications according to the use requirements and the requirements of 3-15 kV.
Each pair of discharge electrodes needs a sub-main discharge power supply and a sub-arcing power supply to be combined to realize a discharge function, n sets of sub-main discharge power supplies and n sets of arcing power supplies are combined according to the number n of discharge channels of the system, the combination of the n sets of sub-main discharge power supplies and the arcing power supplies jointly use an upper computer, the upper computer is communicated with a PLC in each set of sub-main discharge power supplies to complete the functions of setting operation parameters, acquiring and storing the operation parameters in real time, forming operation curves, alarming in operation, recording faults and the like, and the automation level of the whole operation is improved.
In a normal operation state without faults, the multi-winding split-phase rectifier transformer 3 splits the phase of the external three-phase alternating current power supply voltage to form a plurality of groups of three-phase alternating currents with phases different from each other by a certain angle and then supplies the three-phase alternating currents to the rectifier tube rectifying and filtering circuit 4.
The control unit 6 outputs a set value output by the given conditioning circuit 1 according to the use requirement, compares the set value with a real-time result obtained by sampling the voltage and the current output by the high-frequency step-down transformer and the high-frequency rectifying link 7 and the conditioning unit circuit 2, generates a corresponding control voltage after adjusting and operating the difference value between the set value and the real-time result according to the regulation rule of proportion-integral-differential, changes the PWM pulse width output by the PWM pulse forming link in the control unit, drives four IGBTs in the single-phase bridge inverter circuit 5 through the driving circuit, changes the voltage input to the high-frequency step-down transformer and the high-frequency transformer in the high-frequency rectifying link 7 according to the direction of reducing errors, thereby changing the direct current voltage and the current output by the high-frequency step-down transformer and the high-frequency rectifying link 7 and.
Once an operation fault occurs, corresponding protection is performed according to a comparison result of sampling values of the unit circuit 2 for sampling and conditioning the output voltage and the output current and a protection threshold set in the control unit 6.
It should be particularly noted that, in the initial state of the starting operation, the arc ignition power supply 8 is used for generating a high-frequency alternating-current high voltage of several kilovolts in a short time, and is used in the initial stage of the operation of the main power supply for arc plasma discharge, so that gas breakdown is realized, and a preparation condition is provided for forming a current path between the output anode and the output cathode of the main power supply for arc plasma discharge, the arc ignition power supply is used in the arc striking stage, is output according to proper voltages required by different gases and is in isolated coupling connection with the cathode of the output of the main power supply for arc plasma discharge, the arc striking process is finished, and the arc ignition power supply 8 automatically quits the operation after the main power supply for arc plasma discharge is normally put into operation.
The given sampling conditioning circuit 1 comprises a voltage stabilizing circuit, a proportional operation circuit and a diode clamping circuit and is used for providing a given value of a required output signal.
As shown in figure 1, in the given sampling conditioning circuit 1, an external potentiometer P is connected6The output voltage is adjustable from 0V to 10V, and is finally regulated into 0V to 2.5V voltage acceptable by the DSP through two-stage proportional operation and input into an A/D input port of the DSP. The DSP completes the conversion from analog quantity to digital quantity through an integrated A/D conversion module, and the acquisition of given signals is realized. VD in the figure3、VD4The clamping diode is used for limiting the input voltage to change between 0V and 3.3V so as to avoid burning out the input port of the DSP due to too low or too high voltage. The working process is as follows: when the input voltage is greater than 3.3V, VD3The voltage is limited to 3.3V by conduction, and VD is performed when the input voltage is less than 0V4Conduction limits the voltage to 0V.
The output voltage and current sampling conditioning circuit 2 comprises a detection signal of a Hall current sensor, a proportional operation circuit and a diode clamping circuit and is used for providing a feedback signal of PID control operation, and the Hall current sensor is connected in series with an output loop of a rectifying circuit.
As shown in fig. 2, the feedback signal IFY in the figure is a 0-5V signal output by the hall sensor, and is output after two-stage proportional operation. By adjusting the potentiometer P2And finally, regulating the voltage to be acceptable 0-2.5V, and inputting the voltage to an A/D input port of the DSP. The DSP completes the conversion from analog quantity to digital quantity through an integrated A/D conversion module, and realizes the acquisition of feedback signals. In the figure, VD1 and VD2 are clamping diodes used for limiting the input voltage to change between 0V and 3.3V so as to prevent the input port of the DSP from being burnt out due to too low or too high voltage.
The multi-winding split-phase rectifier transformer 3 is connected into a triangle at one time, and can adopt an extension triangle or other connection modes at the second time to form a plurality of three-phase voltages with different phase-shifting angles, for example, two groups of three phases are realized by shifting the phase by +15 degrees, -15 degrees or +30 degrees or 0 degrees; the phase shift of the extension triangular wiring is adopted to realize 3 groups of three phases (corresponding to the mutual difference of 20 degrees); 4 groups of three phases (corresponding to 15 degrees difference of each other) are realized; 6 groups of three phases (corresponding to the mutual difference of 10 degrees) and 8 groups of three phases (corresponding to the mutual difference of 7.5 degrees) are realized, and a specific embodiment of the scheme that the rectifier transformer adopts star-shaped and triangular phase shift for two three-phase windings at the second time is shown in figure 3.
The independent 6-pulse uncontrollable rectification filter circuits 4 can be matched with the multi-winding split-phase rectifier transformer 3 to realize 12-pulse, 18-pulse, 24-pulse, 36-pulse and 48-pulse rectification, and fig. 4 shows a specific embodiment thereof, namely a main circuit scheme of 12-pulse uncontrollable rectification, which is completely matched with fig. 3.
The inverter circuit 5 may employ MOSFETs or IGBTs, may employ single-phase half-bridges or single-phase full-bridges, may employ push-pull circuits, or may employ three-phase bridge inverter circuits, and fig. 5 shows a specific embodiment thereof, in which IGBTs are used as main power devices, and a topology of the single-phase bridge full-bridge inverter circuit is employed.
The control unit 6 may apply an asic, a DSP, or other schemes to complete PWM pulse formation, closed-loop adjustment operation, monitoring, and protection functions, and fig. 6 shows a specific example thereof, i.e., an implementation scheme applying a DSP.
The high-frequency step-down transformer and the high-frequency rectification link 7 are matched with the inverter circuit 5 in a mode, a single-phase transformer is selected when the inverter circuit is single-phase, a three-phase transformer is selected when the inverter circuit is three-phase, the corresponding high-frequency rectification link is correspondingly single-phase full-wave rectification or single-phase bridge rectification or correspondingly three-phase bridge rectification, and voltage-doubling rectification is performed after high-frequency rectification filtering according to the selected rectification mode in use. Fig. 7 shows a specific example thereof-an embodiment applying single-phase bridge high-frequency rectification, which is perfectly matched with the main inverter circuit shown in fig. 5.
In the arc ignition power supply 8, the main circuit may be a single-phase half-wave or a single-phase bridge inverter, or a scheme in which a single-end self-excited transformation is used to rectify ac into dc and then transform the dc into high frequency, and then voltage-doubling rectification is used to obtain an arc starting high voltage is performed, and fig. 8 shows a specific embodiment thereof, i.e., an implementation scheme applying a single-phase bridge inverter.
Claims (9)
1. A combinable switch type power supply structure for arc plasma is characterized by comprising a given conditioning circuit (1) which outputs according to use requirements, a sampling conditioning circuit (2) for output voltage and current, a rectifier transformer (3), a rectifier tube rectifying filter circuit (4), an inverter circuit (5), a control unit (6), a high-frequency step-down transformer and high-frequency rectifying link (7), an arc striking power supply (8) and a main discharge electrode (9);
the rectifier transformer (3) is connected with an alternating current power supply according to the quantity of discharge channels required by use, the input three-phase alternating current voltage is converted into a plurality of groups of three-phase alternating current voltages with the same quantity and number as the discharge channels, the circuit input of the rectifier tube rectifying and filtering circuit (4) is connected with one group of three phases output by the rectifier transformer (3), the three-phase alternating current is rectified and filtered into flat direct current and is supplied to a subsequent inverter circuit (5), PWM pulses output by a link are formed by the inverter circuit (5) according to the PWM pulses in the control unit (6), the flat direct current is isolated and driven by a pulse driving and power amplification circuit and converted into alternating current voltage, and the alternating current voltage is supplied to a high-frequency step-down transformer and a high-frequency rectifying link (7) for step-down matching and high-frequency; the control unit (6) comprises an output value of a given conditioning circuit (1) which needs to be output for discharging and a real-time value of a sampling conditioning circuit (2) which outputs voltage and current, the arc striking power supply (8) is isolated and coupled with a high-frequency step-down transformer and a negative pole of the output direct current of the high-frequency rectifying link (7) and then connected in series, and the control unit (6) is connected with an upper computer (11).
2. The combinable switching power supply structure for arc plasma according to claim 1, wherein the main discharge electrode (9) is formed by plasma, and a rectifier tube rectifying filter circuit (4), an inverter circuit (5), a control unit (6), a high-frequency step-down transformer and high-frequency rectifying link (7), an arc ignition power supply (8) and an upper computer (11) are added between the main discharge electrode (9) and the rectifying transformer (3).
3. A combinable switching power supply structure for arc plasma according to claim 1, wherein the number of electrodes of the high frequency step-down transformer and the high frequency rectifying link (7) connected with each group of plasma main discharge electrodes (9) is 2, and two electrodes are supplied by a sub main discharge switching power supply and a sub arc-striking power supply in combination.
4. The combinable switch type power supply structure for arc plasma according to claim 1, wherein the rectifier transformer (3) is connected to form a triangle at one time, and is connected to form a plurality of three-phase voltages with different phase shift angles at the other time, and the rectifier transformer (3) is connected to a plurality of rectifier tube rectifying and filtering circuits (4) to form 12, 18, 24, 36, 48, 60, 72 pulses at the alternating current input side of the power grid during operation.
5. The combinable switch type power supply structure for arc plasma according to claim 1, wherein the output of the rectifier tube rectifying filter circuit (4) is connected with an inverter circuit (5), the inverter circuit (5) is a single-phase half-bridge, a single-phase full-bridge, a complementary push-pull structure or a three-phase full-bridge, the output of the inverter circuit (5) is connected with the input of a high-frequency step-down transformer and a high-frequency rectifying link (7) and is connected with the driving and control of the PWM pulse output by the driving circuit in the control unit (6), and a main switch device in the inverter circuit is an IGBT or a MOSFET.
6. The combinable switching power supply structure for arc plasma according to claim 1, wherein the control unit (6) is formed by combining a plurality of integrated circuits according to a designed circuit principle or is completed by combining a DSP (digital signal processor), a PLC (programmable logic controller) and a touch screen, the input of the control unit (6) is respectively connected with the given conditioning circuit (1) and the output voltage and current sampling conditioning circuit (2), and the output is connected with a driving electrode of a power electronic device in the inverter circuit (5).
7. A combined switch mode power supply configuration for arc plasma as claimed in claim 1 wherein the high frequency step down transformer and high frequency rectifying link (7) are single phase or three phase with output connected to the main discharge electrode (9) and negative pole connected in series with the ignition power supply (8) after isolated coupling.
8. The combinable switch type power supply structure for arc plasma according to claim 1, wherein the arc ignition power supply (8) adopts a structure that single-phase alternating current is rectified and then is converted into high-frequency alternating current by bridge inversion and then is boosted, the frequency of alternating current voltage can be adjusted according to use requirements, and the frequency of the alternating current voltage is between 3 and 20 kHz.
9. The combinable switch type power supply structure for arc plasma according to claim 1, wherein the arc ignition power supply (8) adopts a structure that single-phase alternating current is rectified and then converted into high-frequency alternating current by bridge inversion and then boosted, high-voltage direct current is obtained by adopting voltage doubling rectification, different voltage doubling rectification stages are adopted according to different requirements of different gases on arc ignition voltage during use, and the arc voltage specification is 3-15 kV.
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| CN202020510068.5U CN212785193U (en) | 2020-04-09 | 2020-04-09 | Combinable switch type power supply structure for arc plasma |
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| CN202020510068.5U CN212785193U (en) | 2020-04-09 | 2020-04-09 | Combinable switch type power supply structure for arc plasma |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023231789A1 (en) * | 2022-06-01 | 2023-12-07 | 北京东方燕中实业发展集团有限公司 | Integrated transformer power source system for multi-phase plasma generation apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023231789A1 (en) * | 2022-06-01 | 2023-12-07 | 北京东方燕中实业发展集团有限公司 | Integrated transformer power source system for multi-phase plasma generation apparatus |
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