CN103401458B - A kind of high-frequency and high-voltage generator three-level resonant transformer - Google Patents
A kind of high-frequency and high-voltage generator three-level resonant transformer Download PDFInfo
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Abstract
A kind of high-frequency and high-voltage generator three-level resonant transformer, comprising: three-phase main-frequency AC power, electromagnetic interface filter, ac/ac power converter, controlled resonant converter, high pressure tank, voltage sensor, system protection unit and bulb load, the input of electromagnetic interface filter is connected with three-phase main-frequency AC power, the output of electromagnetic interface filter is connected with the interchange of ac/ac power converter input, the DC output end U1 of ac/ac power converter is connected with the direct-flow input end of DC booster converter in controlled resonant converter, the DC output end Ud of DC booster converter is connected with the DC bus input of three level high-frequency inverter, the ac output end U0 of three level high-frequency inverter is connected with high pressure tank ac input end, the input of bulb load is connected with high pressure tank DC output end HVd, the voltage sensor be arranged in high pressure tank is connected with the master controller in controlled resonant converter, master controller is connected with system protection unit simultaneously.Invention increases complete machine power factor.
Description
Technical field
What the present invention relates to is high-voltage generator technical field, and what be specifically related to is a kind of high-frequency and high-voltage generator three level resonance converting means.
Background technology
High pressure generator is the core component in the high-end Medical Devices such as X-ray machine, CT machine, and its performance quality directly affects the quality of medical imaging, is one of key technology in advanced medical equipment.Power frequency generator, medium-frequency generator and radio-frequency generator can be divided into by the frequency controlled, and high-frequency and high-voltage generator because of its have compared with high ray output dose stability, volume is little, lightweight, control precision is high, the advantage such as reproducible, it is the main development direction of current high pressure generator, and be more and more widely used, there is good market prospects and important using value.
X-ray machine manufacturer main is at present all own through Research Emphasis is put into digital high frequency X-ray machine, except the large image documentation equipment business of GE, SIEMENS, PHILIPS tri-, the producer of professional production high-frequency and high-voltage generator also increases increasingly, as Canadian CPI company, Hispanic SEDECAL company, domestic Beijing company of Daheng etc.By comparing discovery to the high-frequency and high-voltage generator circuit theory of several typical company and control mode, their high-voltage inverter circuit structure comparison is similar, and control mode is not quite similar, and has respective feature.
Through finding the retrieval of prior art, number of patent application 200710050425.3 describes " X ray high frequency high voltage generator for medical use diagnose " that a kind of reverse frequency is 30kHz, this technology mainly utilizes two groups of identical ordinary inverter, be the medium frequency alternating current of 30kHz by inversion after the rectification of 50Hz power frequency electric, then obtain high voltage direct current for load by series connection after two groups of identical high frequency transformer boostings, rectification.There is following major defect in this technology: because high-frequency inverter uses pwm converter, if high-tension transformer is directly applied in pwm converter, so the existence of leakage inductance can produce higher due to voltage spikes, easy damage power device, the existence of winding electric capacity can make converter have larger circulation, reduces the efficiency of converter.And be difficult to realize Sofe Switch control, frequency is large compared with power device switching loss time high, and lifetime of system is severely limited; Secondly, reverse frequency improves more difficult, and under equivalent capability, high frequency transformer volume, weight are larger, and exporting high pressure can not continuously adjustabe on a large scale, and the high pressure generator scope of application is very limited.
Find through retrieval again, number of patent application 200910185846.6 describes a kind of mode of resonance " high pressure generator and control method thereof for X-ray production apparatus ", inverter topology adopts series parallel resonance structure, switching frequency can improve greatly, but also there is certain defect in this technology: one is exchange to be input as single-phase, and high pressure generator capacity is little; Two be export high pressure can not at continuously adjustabe on a large scale, the scope of application is restricted equally.
Also there is following defect in above technology: all have employed high frequency transformer in generation high pressure link and boost, however due to transformer voltage ratio very large, its parasitic parameter such as leakage inductance and distributed capacitance causes adverse effect to circuit performance.Leakage inductance produces peak voltage, and easily damage switching tube and affect output voltage precision, and distributed capacitance can produce peak current, and the transient response of inverter is deteriorated, the larger impact of high frequency transformer no-load voltage ratio is more obvious.
Summary of the invention
The present invention is directed to the deficiency that prior art exists, a kind of high-frequency and high-voltage generator three-level resonant transformer is provided.Its object is to, the restriction of inversion output to power switch pipe switching frequency not only can be reduced under identical inversion operating frequency, greatly improve inversion operating frequency, the voltage transmission ratio of high frequency transformer can also be reduced, reduce the distributed constant of high frequency transformer to the impact of high-frequency inverter operating characteristic, easily improve the capacity of high pressure generator simultaneously.
The present invention is achieved by the following technical solutions, the present invention includes: alternating current input power supplying, electromagnetic interface filter, ac/ac power converter, three-level resonant transformer, high pressure tank, protected location and voltage sensor etc., wherein: the input of electromagnetic interface filter is three-phase main-frequency AC power, the input of the output termination ac/ac power converter of electromagnetic interface filter, the input unit of the output termination three-level resonant transformer of ac/ac power converter, controlled resonant converter exports and connects high pressure tank high-frequency ac low pressure input, the output of high pressure tank is connected with its operating load (bulb), be arranged on the voltage detection unit output on high pressure tank to be connected with the Voltage Feedback input of three-level resonant transformer, master controller is connected with system protection unit by protection lead-out terminal simultaneously.
Described three-level resonant transformer comprises: DC booster converter, with the three-level inverter of resonance auxiliary unit and global controller, wherein: the input of DC booster converter is connected with the output of ac/ac power converter, output is connected with the DC bus of three-level inverter; The output of three-level inverter is connected with high pressure tank high frequency low voltage AC, and three-level inverter is connected with main controller controls lead-out terminal by control input terminal simultaneously; Control output end of master controller is connected with the input control end of DC booster converter simultaneously; In addition, master controller is connected with high pressure tank voltage detection unit output by detecting input terminal, and master controller is connected with system protection unit by protection lead-out terminal simultaneously.
Described electromagnetic interface filter, the main High-frequency Interference suppressing three-phase main-frequency 380V alternating current.
Three-phase main-frequency 380V AC rectification is 540V direct current by described ac/ac power converter, for three level resonance current transformer provides direct voltage.
Described DC booster converter is mainly used in adjustment and the control of three-level inverter DC input voitage, realizes High voltage output amplitude and power output continuously adjustabe.
Described three level resonance inverter is mainly used in the switch and control from industrial-frequency alternating current to high-frequency alternating current, obtains the high-frequency alternating current of different frequency and different voltage magnitude size.
Described voltage sensor, for three level resonance current transformer provides high voltage feedback signal, controls to realize resonance PWM.
Described protected location is mainly used in the various safeguard protections of system.
The present invention carries out work in the following manner: when system starts, and controlled resonant converter reads voltage control parameter.The course of work of three-level resonant transformer is: first, the controling parameters requirement that DC dc converter in controlled resonant converter exports according to high voltage direct current, be that direct current exports Ud by the 540V DC power conversion that ac/ac power converter exports, and Ud continuously adjustabe, Ud inversion is that to export the rectification again of boosting of U0, the last U0 high frequency transformer in high pressure tank be that high voltage direct current HVd exports to load to high-frequency ac by the three-level inverter then in controlled resonant converter.The adjustment of Ud is undertaken by DC dc converter, and DC dc converter adopts ZCS-PWM-BOOST converter to realize a kind of teractive loss-less snubber boosting rectifier control with zero-current switching.High-frequency inverter adopts diode-clamped three level main circuit topological structure, method by staircase wave is adopted to realize controlling the PWM of tri-level inversion main circuit, this modulator approach can allow the switching frequency operation of power device in fundamental frequency, and modulation ratio excursion is wide and algorithm simple, hardware is easy to realize.
Compared with prior art, present invention employs boosting-multi-level inverse conversion Two Stages structure, its application will not be subject to the restriction of high pressure generator type (single-phase or three-phase alternating current input); High voltage direct current exports voltage, inversion operating frequency parameter is adjustable online, namely inverter DC bus-bar voltage size, reverse frequency can adjust arbitrarily and control, the high direct voltage output of different reverse frequency, different electric pressure can be obtained, under the condition that control module is constant, dilatation can also be carried out, to adapt to the requirement of different capacity grade to high pressure generator capacity by changing power component; Owing to adopting tri-level inversion technology, improve complete machine power factor, the harmonic wave reducing switching loss and electrical network is produced, energy saving of system, environmental protection; Whole control system realizes total digitalization design, substantially increases the reliability of system, flexibility.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is DC dc converter structural representation.
Fig. 3 three level high-frequency inverter structural representation.
Fig. 4 is high pressure tank construction schematic diagram;
Fig. 5 is embodiment effect schematic diagram, namely load terminal voltage (VP1/V) and electric current (I (RLC)/A) waveform when reverse frequency is 40kHz, wherein VP1 is three-level inverter output load voltage waveform, and I (RLC) is three-level inverter output load current waveform.
Fig. 6 is reverse frequency when being 25.5kHz load terminal voltage (VP1/V), electric current (I (RLC)/A) waveform.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under premised on technical solution of the present invention, give detailed execution mode and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
As shown in Figure 1, Figure 2, Figure 3, Figure 4, the present embodiment comprises: three-phase main-frequency AC power 1, electromagnetic interface filter 2, ac/ac power converter 3, controlled resonant converter 4, high pressure tank 7, voltage sensor 8, system protection unit 10 and bulb load 11.Wherein: controlled resonant converter 4 is made up of DC booster converter 5, three level high-frequency inverter 6 and master controller 9; High pressure tank 7 is made up of high frequency transformer 14 and secondary voltage multiplying rectifier unit 15.The input of electromagnetic interface filter 2 is connected with three-phase main-frequency AC power 1, the output of electromagnetic interface filter 2 is connected with the interchange input of ac/ac power converter 3, the DC output end U1 of ac/ac power converter 3 is connected with the direct-flow input end of DC booster converter 5 in controlled resonant converter 4, the DC output end Ud of DC booster converter 5 is connected with the DC bus input of three level high-frequency inverter 6, the ac output end U0 of three level high-frequency inverter 6 is connected with the elementary ac input end of high pressure tank 7 medium/high frequency transformer 14, the input of bulb load 11 is connected with the DC output end of voltage multiplying rectifier unit 15 secondary in high pressure tank 7, voltage sensor in secondary voltage multiplying rectifier unit 15 is connected with the master controller 9 in controlled resonant converter 4, master controller 9 is connected with system protection unit 10 simultaneously.
Described DC booster converter 5 is single quadrant Boost DC translation circuits (Boost circuit), this circuit comprises two parts: one is Active Snubber Circuit 12, by anti-paralleled diode D1 resonant inductance L2, resonant capacitance C2, sustained diode 2 and active switch T2 (its anti-paralleled diode D3 can utilize the built-in diode of MOSFET); Two is booster circuits, the filter inductance L1 connecting large by input, switch transistor T 1, output the filter capacitor Cd of the United Nations General Assembly.C1 is converter input filter condenser.The feature of this booster circuit is on the basis of PWM-Boost circuit, the Sofe Switch of ZCS-PWM-Boost can be realized, turn-off power loss obviously reduces, effectively improve circuit characteristic, the circuit condition of ZCS environment is kept easily to realize, and not being subject to the impact of input voltage and load variations, overall efficiency is high.
Described three level high-frequency inverter 6 adopts diode-clamped tri-level inversion main circuit topological structure, comprise two parts altogether: wherein D11, D12, D13, D14 is clamping diode, Cd1, Cd2 is DC partial voltage electric capacity, both capacitances are equal, each phase bridge arm circuit is by 4 main switching device (G1, G2, G3, G4 forms a phase, G5, G6, G7, G8 forms a phase), 4 fly-wheel diodes, 2 clamping diode (D11, D14 is one group, D12, D13 is one group), two-phase brachium pontis and clamping diode form full-bridge type Converting Unit, in order to improve main switch service behaviour, each main switch also connects an electric capacity (C11 ~ C18), another part is resonance auxiliary unit 13, and wherein Ls is resonant inductance (comprising the leakage inductance of high frequency transformer 14), and Cs is series resonance building-out capacitor, and Cp is parallel resonance electric capacity (comprising the distributed capacitance of high frequency transformer 14).Ls, Cs, Cp need and high frequency transformer carries out coupling consideration.According to specific needs, when three level high-frequency inverter works with resonance manner, series resonance, series parallel resonance mode can be operated in.
In the present embodiment, when system starts, after system readiness, master controller 9 in controlled resonant converter 4 shown in Fig. 1 reads high-voltage dc voltage controling parameters, master controller 9 in controlled resonant converter 4 is first according to controling parameters requirement, directly PWM control is carried out to DC dc converter 5, ZCS-PWM-BOOST conversion scheme is adopted to realize the teractive loss-less snubber boosting rectifier control with zero-current switching in the present embodiment, the 540V direct current exported by ac/ac power converter 3 is converted to required direct current and exports Ud, Ud can realize continuous adjustment, Ud inversion is that high-frequency ac exports U0 by the high-frequency inverter 6 then in controlled resonant converter 4, in the present embodiment, inverter adopts Diode-clamped Three-level Inverter topological structure, and on DSP+FPGA hardware platform, adopt method by staircase wave to realize controlling the PWM of tri-level inversion main circuit, the switching frequency of power device can be operated in fundamental frequency, modulation ratio excursion is wide, algorithm is simple, and be easy to realize, the high frequency transformer 14 of last U0 in high pressure tank 7 boosts, be transformed to high voltage direct current HVd through secondary voltage multiplying rectifier unit 15 again and export to bulb load 11, and realize by the Voltage Feedback of voltage sensor 8 in secondary voltage multiplying rectifier unit 15 closed-loop control high voltage direct current being exported to voltage.
The present embodiment by experiment method is verified, verification environment is: mobile X-ray unit (high pressure generator resonant operational frequency 40kHz, power 20kW).Test condition: high-frequency inverter DC bus-bar voltage 800VDC input voltage, IGBT paralleled power switches electric capacity is 0.04 μ F, and resonant inductance Ls gets 105 μ H, and building-out capacitor Cs gets 0.4 μ F, and system works in series resonance mode.Fig. 5, Figure 6 shows that above-described embodiment test design sketch.The present embodiment by the existing controling parameters of amendment, can check the control effects of high pressure generator.
Claims (3)
1. a high-frequency and high-voltage generator, it is characterized in that, comprising: three-phase main-frequency AC power (1), electromagnetic interface filter (2), ac/ac power converter (3), controlled resonant converter (4), high pressure tank (7), voltage sensor (8), system protection unit (10) and bulb load (11); the input of electromagnetic interface filter (2) is connected with three-phase main-frequency AC power (1), the output of electromagnetic interface filter (2) is connected with the interchange input of ac/ac power converter (3), the DC output end U1 of ac/ac power converter (3) is connected with the direct-flow input end of DC booster converter (5) in controlled resonant converter (4), the DC output end Ud of DC booster converter (5) is connected with the DC bus input of three level high-frequency inverter (6), the ac output end U0 of three level high-frequency inverter (6) is connected with the elementary ac input end of high pressure tank (7) medium/high frequency transformer (14), the input of bulb load (11) is connected with the DC output end of voltage multiplying rectifier unit (15) secondary in high pressure tank (7), voltage sensor in secondary voltage multiplying rectifier unit (15) is connected with the master controller (9) in controlled resonant converter (4), master controller (9) is connected with system protection unit (10) simultaneously, described controlled resonant converter (4) is made up of DC booster converter (5), three level high-frequency inverter (6) and master controller (9), high pressure tank (7) is made up of high frequency transformer (14) and secondary voltage multiplying rectifier unit (15), by increasing resonance auxiliary unit (13) in described high-frequency inverter (6), mate with the high frequency transformer in high pressure tank (7), select the resonance manner of three level high-frequency inverter, to be operated in series resonance mode or to be operated in series parallel resonance mode.
2. high-frequency and high-voltage generator according to claim 1, it is characterized in that, described DC booster converter (5) adopts ZCS-PWM-BOOST mono-quadrant Boost DC translation circuit to realize a kind of teractive loss-less snubber boosting rectifier control with zero-current switching, on the basis of PWM-Boost circuit, realize the Sofe Switch of ZCS-PWM-Boost.
3. high-frequency and high-voltage generator according to claim 1, it is characterized in that, described high-frequency inverter (6) adopts diode-clamped three level main circuit topological structure, method by staircase wave is adopted to realize controlling the PWM of tri-level inversion main circuit, make the switching frequency operation of power device in fundamental frequency, and realize on DSP+FPGA hardware platform.
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| CN105520739A (en) * | 2015-11-27 | 2016-04-27 | 刘洋 | X-ray machine based on Internet of Things and adopting direct-current inversion technology |
| CN105709342B (en) * | 2016-01-21 | 2019-02-26 | 南宁科伦新技术有限公司 | A kind of excitation of X-rays light power diagnosis and treatment deep tumor system |
| CN106849673B (en) * | 2017-03-20 | 2019-08-16 | 东南大学 | A kind of zero current combined type resonance three-level DC converter and its control method |
| CN107222109B (en) * | 2017-07-18 | 2019-06-04 | 北京航空航天大学 | A kind of two-way isolated DC-DC converter containing active snubber |
| CN108599615B (en) * | 2018-06-30 | 2024-04-19 | 浙江大学昆山创新中心 | Feedback type EAP driving system and feedback control method thereof |
| CN112327238A (en) * | 2020-11-30 | 2021-02-05 | 国网河北省电力有限公司营销服务中心 | System for testing key performance of direct current transformer |
| CN114785173B (en) * | 2022-03-07 | 2024-05-17 | 东北电力大学 | AC/DC multi-port three-level converter with boosting capability and modulation method thereof |
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