CN103401458A - Three-level resonance converter of high-frequency and high-voltage generator - Google Patents
Three-level resonance converter of high-frequency and high-voltage generator Download PDFInfo
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Abstract
The invention relates to a three-level resonance converter of a high-frequency and high-voltage generator. The three-level resonance converter comprises a three-phase working frequency alternating current power source, an EMI (electro-magnetic interference) filter, an alternating current and direct current rectifier, a resonance converter, a high-voltage tank, a voltage sensor, a system protection unit and a ball tube load, wherein the input end of the EMI filter is connected with the three-phase working frequency alternating current power source, the output end of the EMI filter is connected with the alternating current input end of the alternating current and direct current rectifier, the direct current output end U1 of the alternating current and direct current rectifier is connected with the direct current input end of a direct current and direct current boosting converter in the resonance converter, the direct current output end Ud of the direct current and direct current boosting converter is connected with the input end of a direct current bus of a three-level high frequency inverter, the alternating current output end U0 of the three-level high frequency inverter is connected with the alternating current input end of the high-voltage tank, the input end of the ball tube load is connected with the HVd phase of the direct current end of the high-voltage tank, a voltage sensor arranged in the high-voltage tank is connected with a main controller in the resonance converter, and the main controller is simultaneously connected with the system protection unit. The converter improves the integral power factor.
Description
Technical field
What the present invention relates to is the 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.Can be divided into power frequency generator, medium-frequency generator and radio-frequency generator by the frequency of controlling, and high-frequency and high-voltage generator has than high ray output dose stability, the advantages such as volume is little, lightweight, control precision is high, good reproducibility because of it, it is the main development direction of present high pressure generator, and more and more be widely used, have good market prospects and important using value.
At present main X-ray machine manufacturer is all own through Research Emphasis being put into digital High Frequency X-ray Machine, except GE, SIEMENS, the large image documentation equipment business of PHILIPS three, 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.Compare discovery by high-frequency and high-voltage generator circuit theory and control mode to several typical company, seemingly, control mode is not quite similar their high-voltage inverter circuit structure comparing class, and characteristics are separately arranged.
Find through the retrieval to prior art, number of patent application 200710050425.3 has been put down in writing " X ray high frequency high voltage generator for medical use diagnose " that a kind of reverse frequency is 30kHz, this technology is mainly utilized two groups of identical common inverters, be the medium frequency alternating current of 30kHz with inversion after 50Hz power frequency electric rectification, then by two groups of identical high frequency transformers boost, series connection obtains high voltage direct current for load after rectification.There is following major defect in this technology: because high-frequency inverter uses pwm converter, if directly be applied in high-tension transformer in pwm converter, the existence of leakage inductance can produce higher due to voltage spikes so, easily damage power device, the existence of winding electric capacity can make converter that larger circulation is arranged, and has reduced the efficiency of converter.And be difficult to realize that soft switch controls, frequency power device switching loss when high is large, and lifetime of system is severely limited; Secondly, reverse frequency improves more difficult, and high frequency transformer volume, weight are larger under equal capacity, and the output high pressure can not be adjustable continuously 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 has been put down in writing a kind of mode of resonance " high pressure generator and the control method thereof that are used for X-ray production apparatus ", inverter topology adopts the series parallel resonance structure, switching frequency can improve greatly, but also there is certain defect in this technology: the one, and interchange is input as single-phase, and the high pressure generator capacity is little; The 2nd, the output high pressure can not be adjustable continuously on a large scale, and the scope of application is restricted equally.
Also there is following defect in above technology: all adopted high frequency transformer to boost in generation high pressure link, yet because transformer voltage ratio is very large, the parasitic parameters such as its leakage inductance and distributed capacitance have caused adverse effect to circuit performance.Leakage inductance produces peak voltage, easily damage switching tube and affect the output voltage precision, and distributed capacitance can produce peak current, makes the transient response variation of inverter, and 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 purpose is, not only can reduce the restriction of inversion output to the power switch pipe switching frequency under identical inversion operating frequency, greatly improve the inversion operating frequency, can also reduce the voltage transmission ratio of high frequency transformer, reduce the impact of the distributed constant of high frequency transformer on the high-frequency inverter operating characteristic, easily improve simultaneously the capacity of high pressure generator.
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, the high pressure tank, protected location and voltage sensor etc., wherein: the input of electromagnetic interface filter is the 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 output connects high pressure tank high-frequency ac low pressure input, the output of high pressure tank is connected with its operating load (bulb), the voltage detection unit output that is arranged on the high pressure tank is connected with the Voltage Feedback input of three-level resonant transformer, master controller is connected with the system protection unit by the protection lead-out terminal simultaneously.
Described three-level resonant transformer comprises: direct current DC booster converter, with three-level inverter and the global controller of resonance auxiliary unit, wherein: the input of direct current DC booster converter is connected with the output of ac/ac power converter, and 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 the main controller controls lead-out terminal by the control inputs terminal simultaneously; The control output end of master controller is connected with the input control end of direct current 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 the system protection unit by the protection lead-out terminal simultaneously.
Described electromagnetic interface filter, mainly suppress the High-frequency Interference of three-phase main-frequency 380V alternating current.
Described ac/ac power converter, be the 540V direct current with three-phase main-frequency 380V AC rectification, for the three level resonance current transformer provides direct voltage.
Described direct current DC booster converter is mainly used in adjustment and the control of three-level inverter DC input voitage, realizes that High voltage output amplitude and power output are adjustable continuously.
Described three level resonance inverter is mainly used in conversion and the control from the industrial-frequency alternating current to the high-frequency alternating current, obtains the high-frequency alternating current of different frequency and different voltage magnitude sizes.
Described voltage sensor,, for the three level resonance current transformer provides the high voltage feedback signal, control 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 started, controlled resonant converter read the voltage control parameter.The course of work of three-level resonant transformer is: at first, dc dc converter in controlled resonant converter is according to the control parameter request of high voltage direct current output, the 540V direct current of ac/ac power converter output is transformed to direct current output Ud, and Ud is adjustable continuously, then the three-level inverter in controlled resonant converter is high-frequency ac output U0 with the Ud inversion, and the rectification again of boosting is that high voltage direct current HVd exports to load to last U0 through the high frequency transformer in the high pressure tank.The adjustment of Ud is undertaken by dc dc converter, and dc dc converter adopts the ZCS-PWM-BOOST converter to realize a kind of active lossless buffering boosting rectifier control with zero-current switching.High-frequency inverter adopts diode-clamped three level main circuit topological structures, adopt method by staircase wave to realize the PWM of tri-level inversion main circuit is controlled, this modulator approach can allow the switching frequency of power device be operated in fundamental frequency, and the modulation ratio excursion is wide and algorithm is simple, is easy on hardware realize.
Compared with prior art, the present invention has adopted and has boosted-multi-level inverse conversion Two Stages structure, and its application will not be subjected to the restriction of high pressure generator type (single-phase or three-phase alternating current input); High voltage direct current is exported voltage, inversion operating frequency parameter is adjustable online, be that inverter DC bus-bar voltage size, reverse frequency can be adjusted arbitrarily and control, can obtain the high direct voltage output of different reverse frequencies, different electric pressures, under the constant condition of control module, can also carry out dilatation by changing power component, to adapt to the requirement of different capacity grade to the high pressure generator capacity; , owing to adopting the tri-level inversion technology, improved the complete machine power factor, the harmonic wave that has reduced switching loss and electrical network is produced, energy saving of system, environmental protection; Whole control system realizes total digitalization design, the reliability, the flexibility that have greatly improved system.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the dc dc converter structural representation.
Fig. 3 three level high-frequency inverter structure schematic diagrames.
Fig. 4 is high pressure tank construction schematic diagram;
Fig. 5 is embodiment effect schematic diagram, be reverse frequency load terminal voltage (VP1/V) and electric current (I (RLC)/A) waveform while being 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 load terminal voltage (VP1/V), electric current (I (RLC)/A) waveform while being 25.5kHz.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are elaborated: the present embodiment is implemented under take technical solution of the present invention as prerequisite, provided 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 comprised of direct current DC booster converter 5, three level high-frequency inverters 6 and master controller 9; High pressure tank 7 is comprised 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 direct current DC booster converter 5 in controlled resonant converter 4, the dc output end Ud of direct current DC booster converter 5 is connected with the dc bus input of three level high-frequency inverters 6, the ac output end U0 of three level high-frequency inverters 6 is connected with the elementary ac input end of high pressure tank 7 medium/high frequency transformers 14, the input of bulb load 11 is connected with the dc output end of secondary voltage multiplying rectifier unit 15 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 direct current DC booster converter 5 is single quadrant booster type DC transfer circuit (Boost circuit), this circuit comprises two parts: the one, and 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); The 2nd, booster circuit, by the filter capacitor Cd of large filter inductance L1, switch transistor T 1, output and the United Nations General Assembly of input series connection.C1 is the converter input filter condenser.The characteristics of this booster circuit are on the basis of PWM-Boost circuit, can realize the soft switch of ZCS-PWM-Boost, turn-off power loss obviously reduces, effectively improved circuit characteristic, keep the circuit condition of ZCS environment easily to realize, and be not subjected to the impact of input voltage and load variations, overall efficiency is high.
described three level high-frequency inverters 6 adopt diode-clamped tri-level inversion main circuit topological structure, comprise altogether two parts: D11 wherein, D12, D13, D14 is clamping diode, Cd1, Cd2 is dc partial voltage electric capacity, both capacitances equate, 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 the full-bridge type Converting Unit, in order to improve the main switch service behaviour, each main switch also meets 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 interior), and Cs is the series resonance building-out capacitor, and Cp is parallel resonance electric capacity (comprising the distributed capacitance of high frequency transformer 14 interior).Ls, Cs, Cp need and high frequency transformer mates consideration.According to specific needs, when three level high-frequency inverters are worked with resonance manner, can be operated in series resonance, series parallel resonance mode.
in the present embodiment, when system starts, after system is ready, master controller 9 in controlled resonant converter 4 shown in Figure 1 reads high voltage direct current pressure-controlled parameter, master controller 9 in controlled resonant converter 4 is at first according to controlling parameter request, dc dc converter 5 is directly carried out PWM to be controlled, adopt the ZCS-PWM-BOOST conversion scheme to realize having the active lossless buffering boosting rectifier control of zero-current switching in the present embodiment, the 540V direct current of ac/ac power converter 3 outputs is converted to required direct current output Ud, Ud can realize continuous adjusting, then the high-frequency inverter 6 in controlled resonant converter 4 is high-frequency ac output U0 with the Ud inversion, in the present embodiment, inverter adopts the Diode-clamped Three-level Inverter topological structure, and adopt method by staircase wave to realize the PWM of tri-level inversion main circuit is controlled on the DSP+FPGA hardware platform, the switching frequency of power device can be operated in fundamental frequency, the modulation ratio excursion is wide, algorithm is simple, and be easy to realize, last U0 boosts through the high frequency transformer 14 in high pressure tank 7, be transformed to high voltage direct current HVd through secondary voltage multiplying rectifier unit 15 again and export to bulb load 11, and realize high voltage direct current is exported the closed-loop control of voltage by the Voltage Feedback of voltage sensor 8 in secondary voltage multiplying rectifier unit 15.
The present embodiment method by experiment verifies, 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 is worked in the series resonance mode.Fig. 5, Figure 6 shows that above-described embodiment test design sketch.The present embodiment can, by revising existing control parameter, can be checked the control effect of high pressure generator.
Claims (5)
1. high-frequency and high-voltage generator three-level resonant transformer, 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 direct current DC booster converter (5) in controlled resonant converter (4), the dc output end Ud of direct current DC booster converter (5) is connected with the dc bus input of three level high-frequency inverters (6), the ac output end U0 of three level high-frequency inverters (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 secondary voltage multiplying rectifier unit (15) 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.
2. high-frequency and high-voltage generator three-level resonant transformer according to claim 1, is characterized in that, described controlled resonant converter (4) is comprised of direct current DC booster converter (5), three level high-frequency inverters (6) and master controller (9); High pressure tank (7) is comprised of high frequency transformer (14) and secondary voltage multiplying rectifier unit (15).
3. high-frequency and high-voltage generator three-level resonant transformer according to claim 2, it is characterized in that, the single quadrant booster type of the ZCS-PWM-BOOST DC transfer circuit that adopts described direct current DC booster converter (5) realizes a kind of active lossless buffering boosting rectifier control with zero-current switching, on the basis of PWM-Boost circuit, realize the soft switch of ZCS-PWM-Boost, reduce turn-off power loss, effectively improve circuit characteristic.
4. high-frequency and high-voltage generator three-level resonant transformer according to claim 2, it is characterized in that, described high-frequency inverter (6) adopts diode-clamped three level main circuit topological structures, adopt method by staircase wave to realize the PWM of tri-level inversion main circuit is controlled, make the switching frequency of power device can be operated in fundamental frequency, the modulation ratio excursion is wide and algorithm is simple, and realizes on the DSP+FPGA hardware platform.
5. high-frequency and high-voltage generator three-level resonant transformer according to claim 2, it is characterized in that, pass through to increase resonance auxiliary unit (13) in described high-frequency inverter (6), can be according to the characteristic of high pressure tank (7), mate with high-frequency inverter (6), select flexibly the resonance manner of three level high-frequency inverters, both can be operated in the series resonance mode and also can be operated in the series parallel resonance mode.
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Cited By (7)
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| CN105709342A (en) * | 2016-01-21 | 2016-06-29 | 南宁科伦新技术有限公司 | X-ray excitation photodynamic deep tumor diagnosis and treatment system and use method thereof |
| WO2017088333A1 (en) * | 2015-11-27 | 2017-06-01 | 刘洋 | Internet of things-based x-ray generator employing direct current inverter technique |
| CN106849673A (en) * | 2017-03-20 | 2017-06-13 | 东南大学 | A kind of zero current combined type resonance three-level DC converter and its control method |
| CN107222109A (en) * | 2017-07-18 | 2017-09-29 | 北京航空航天大学 | A kind of two-way isolated DC DC converters containing active snubber |
| CN108599615A (en) * | 2018-06-30 | 2018-09-28 | 浙江大学昆山创新中心 | A kind of reaction type EAP drive systems and its feedback |
| 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 |
| CN114785173A (en) * | 2022-03-07 | 2022-07-22 | 东北电力大学 | AC/DC multi-port three-level converter with boosting capability and modulation method thereof |
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| WO2017088333A1 (en) * | 2015-11-27 | 2017-06-01 | 刘洋 | Internet of things-based x-ray generator employing direct current inverter technique |
| CN105709342A (en) * | 2016-01-21 | 2016-06-29 | 南宁科伦新技术有限公司 | X-ray excitation photodynamic deep tumor diagnosis and treatment system and use method thereof |
| 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 |
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| CN107222109A (en) * | 2017-07-18 | 2017-09-29 | 北京航空航天大学 | A kind of two-way isolated DC DC converters containing active snubber |
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| CN108599615A (en) * | 2018-06-30 | 2018-09-28 | 浙江大学昆山创新中心 | A kind of reaction type EAP drive systems and its feedback |
| 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 |
| CN114785173A (en) * | 2022-03-07 | 2022-07-22 | 东北电力大学 | AC/DC multi-port three-level converter with boosting capability and modulation method thereof |
| 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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