CN106455278A - X-ray high-voltage generator and circuit and method for controlling series resonant converter - Google Patents
X-ray high-voltage generator and circuit and method for controlling series resonant converter Download PDFInfo
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- CN106455278A CN106455278A CN201611005443.5A CN201611005443A CN106455278A CN 106455278 A CN106455278 A CN 106455278A CN 201611005443 A CN201611005443 A CN 201611005443A CN 106455278 A CN106455278 A CN 106455278A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05G—X-RAY TECHNIQUE
- H05G1/00—X-ray apparatus involving X-ray tubes; Circuits therefor
- H05G1/08—Electrical details
- H05G1/26—Measuring, controlling or protecting
- H05G1/30—Controlling
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0048—Circuits or arrangements for reducing losses
- H02M1/0054—Transistor switching losses
- H02M1/0058—Transistor switching losses by employing soft switching techniques, i.e. commutation of transistors when applied voltage is zero or when current flow is zero
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- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Inverter Devices (AREA)
Abstract
The invention provides an X-ray high-voltage generator and a circuit and a method for controlling a series resonant converter. An inverter circuit of the series resonant converter comprises a leading leg and a lagging leg, the leading leg comprises a first switch device and a second switch device, and the lagging leg comprises a third switch device and a fourth switch device. The circuit comprises a driving circuit, and first driving signals, second driving signals, third driving signals and fourth driving signals can be provided to the first switch device, the second switch device, the third switch device and the fourth switch device by the driving circuit. Bipolar modulation can be carried out by the first driving signals and the second driving signals, turn-on moments of the third driving signals and the fourth driving signals are respectively identical to turn-on moments of the second driving signals and the first driving signals, and turn-off moments of the third driving signals and the fourth driving signals are determined according to currents of resonant cavities of the series resonant converter; alternately, bipolar modulation is carried out by the first driving signals and the third driving signals, turn-on moments of the second driving signals and the fourth driving signals are respectively identical to turn-on moments of the third driving signals and the first driving signals, and turn-off moments of the second driving signals and the fourth driving signals are determined according to the currents of the resonant cavities of the series resonant converter.
Description
Technical field
The invention mainly relates to X-ray high-voltage generator, the series resonance change of more particularly, to a kind of X-ray high-voltage generator
The control circuit of parallel operation and control method.
Background technology
X-ray high-voltage generator sets for roentgenotherapia equipment, x-ray diagnostic equipment, X ray computer layer radiography
In the standby equipment such as (CT), Positron Emission Computed Tomography (PET-CT).Inversion in high power x-ray high tension generator
In circuit, in order to meet the requirement working long hours, generally select insulated gate bipolar switching device (Insulated Gate
Bipolar Transistor, IGBT) as switching device.This generally has claimed below to inverter circuit：1. need inversion electricity
There is higher load capacity on road, to adapt to the requirement of wide range output；2. reduce the current peak flowing through switching device as far as possible
Value, with reduces cost, reduces the turn-off power loss of switching device simultaneously；3. inductive current full-load range is kept to be in on-off state,
To realize the zero current turning-on of switching device；4. keep higher switching frequency, to reduce high-tension transformer and rectification circuit
Volume；5. inverter circuit needs to adapt to the impact of the larger parasitic capacitance of high-tension transformer and stray inductance.
Inverter circuit forms series-resonant inverting circuit with series resonant circuit.Series-resonant inverting circuit further with change
The devices such as depressor, commutator form series resonant converter.
A kind of main circuit of series resonant converter 10 is as shown in figure 1, include the inverter circuit of switching device Q1-Q4 composition
The series resonant circuit 12 of 11, inductance Ls and electric capacity Cs composition, high frequency high voltage transformer Tr and voltage-doubler rectifier 13.Series resonance
Changer 10 exports X-ray tube 14.The control mode that series resonant converter 10 adopts generally includes bipolar modulation, phase shift
Modulation and Frequency-variable Modulation.
Bipolar modulation mode as shown in Fig. 2 the drive signal non-overlapping copies of switching device Q1 and Q2, switching device Q3 and
The drive signal non-overlapping copies of Q4, and the drive signal homophase of switching device Q1 and Q4.Because clinodiagonal switching device is (as Q1
And Q4, Q2 and Q3) with opening with pass, all of switching device will bear larger turn-off power loss.
Phase shift modulation mode is as shown in figure 3, the dutycycle of leading-bridge switching device Q1 and Q2 is all 50% and complementary
Conducting, the dutycycle of lagging leg switching device Q3 and Q4 is also all 50%, and complementary conducting；By adjust leading-bridge and
The relative phase relation of lagging leg, to control output voltage switching device switching device switching device.By then passing through two
There is turn-off power loss adjusting output voltage, only leading-bridge in the mode of bridge arm voltage phase shift, lagging leg no turns off substantially
Loss.But because brachium pontis mid-point voltage has zero vector, there is current oscillation during afterflow, and transformator distribution capacity CwMore
Greatly, vibration is stronger, and switching device will be unable to realize no-voltage open-minded.As illustrated in figures 4 a and 4b, when consider transformator distribution
Electric capacity CwWhen, under severe duty and under light duty, all can produce concussion.
During using Frequency-variable Modulation, the switching frequency of switching device needs wide variation, leads to rectification circuit 11 and transformation
Device Tr needs larger volume.
Sum it up, the technical scheme of this several usual employing is difficult to meet HF switch, wide range output, low one-tenth simultaneously
Originally, low-loss, and the requirement of high-adaptability.
Content of the invention
The technical problem to be solved in the present invention is to provide a kind of control of the series resonant inverter of X-ray high-voltage generator
Circuit, overcomes the problem of the modulation system of existing series resonant converter.
For solving above-mentioned technical problem, the invention provides a kind of control circuit of series resonant converter, described series connection
Controlled resonant converter includes inverter circuit, and described inverter circuit includes leading-bridge and lagging leg, and described leading-bridge includes
One switching device and second switch device, described lagging leg includes the 3rd switching device and the 4th switching device, described control
Circuit includes：Drive circuit, provides the first drive signal to described first switch device, provides the second drive signal to described
Two switching devices, provide the 3rd drive signal to described 3rd switching device, provide fourth drive signal to described 4th switch
Device；Wherein：Described first drive signal and described second drive signal constitute bipolar modulation, and described 3rd drive signal drives
The turn-on instant moving described 3rd switching device drives the turn-on instant of second switch device identical with described second drive signal,
Described fourth drive signal drives the turn-on instant of described 4th switching device and described first drive signal to drive first switch
The turn-on instant of device is identical, and described 3rd drive signal and described fourth drive signal drive described 3rd switching device and the
The shutoff moment of four switching devices is that the cavity current according to described series resonant converter determines；Or described first driving
Signal and described 3rd drive signal constitute bipolar modulation, and described second drive signal drives leading of described second switch device
The logical moment drives the turn-on instant of described 3rd switching device identical with described 3rd drive signal, and described fourth drive signal is driven
Move the turn-on instant of described 4th switching device and described first drive signal drives the turn-on instant of described first switch device
Identical, the pass of described second drive signal and the described fourth drive signal described second switch device of driving and the 4th switching device
The disconnected moment is that the cavity current according to described series resonant converter determines.
In one embodiment of this invention, described 3rd drive signal drive described 3rd switching device the shutoff moment be
The cavity current of described series resonant converter rises to for zero moment, and described fourth drive signal drives the 4th switching device
Turn off the moment be this series resonant converter cavity current drop to zero moment；Or described second drive signal drives
That moves described second switch device turns off the moment that the cavity current that the moment is described series resonant converter rises to zero, institute
State fourth drive signal and drive the cavity current that the shutoff moment of described 4th switching device is described series resonant converter
Drop to for zero moment.
In one embodiment of this invention, described drive circuit is by comparing sawtooth waveforms and the adjustable threshold value of amplitude,
To produce a pair of drive signal constituting bipolar modulation.
In one embodiment of this invention, described drive circuit passes through to judge the resonator cavity electricity of described series resonant converter
Whether stream reaches threshold value to determine this shutoff moment.
In one embodiment of this invention, described drive circuit judges that the cavity current of described series resonant converter reaches
Postpone a scheduled time as the described shutoff moment to after the moment of described threshold value.
In one embodiment of this invention, the dutycycle constituting a pair of drive signal of bipolar modulation is respectively less than 50%.
The present invention also proposes a kind of X-ray high-voltage generator, including series resonant converter as above, and described control
Circuit processed controls the resonator cavity of described series resonant converter to be in discontinuous conduct mode.
The present invention proposes a kind of control method of series resonant converter, and described series resonant converter includes inversion electricity
Road, described inverter circuit includes leading-bridge and lagging leg, and described leading-bridge includes first switch device and second switch
Device, described lagging leg includes the 3rd switching device and the 4th switching device, and methods described includes：First drive signal is provided
To described first switch device, provide the second drive signal to described second switch device, provide the 3rd drive signal to described
3rd switching device, provides fourth drive signal to described 4th switching device；Wherein said first drive signal and described
Two driving signal drives described leading-bridge to carry out bipolar modulation, and described 3rd drive signal drives described 3rd switching device
Turn-on instant with described second drive signal drive described second switch device turn-on instant identical, described 4th drive letter
Number drive described 4th switching device turn-on instant with described first drive signal drive described first switch device conducting
Moment is identical, described 3rd drive signal and described fourth drive signal drive described 3rd switching device and the 4th derailing switch
The shutoff moment of part is that the cavity current according to described series resonant converter determines；Or described first drive signal and institute
State the 3rd drive signal constitute bipolar modulation, described second drive signal drive described second switch device turn-on instant with
Described 3rd drive signal drives the turn-on instant of described 3rd switching device identical, and described fourth drive signal drives described the
The turn-on instant of four switching devices drives the turn-on instant of described first switch device identical with described first drive signal, described
Second drive signal and described fourth drive signal drive the shutoff moment of described second switch device and the 4th switching device to be
Cavity current according to described series resonant converter determines.
In one embodiment of this invention, described 3rd drive signal drive described 3rd switching device the shutoff moment be
The cavity current of described series resonant converter rises to for zero moment, and described fourth drive signal drives described 4th switch
Device turn off the moment be this series resonant converter cavity current drop to zero moment；Or described second drives letter
Number drive described second switch device turn off the moment be described series resonant converter cavity current rise to zero when
Carve, described fourth drive signal drives the resonator cavity that the shutoff moment of described 4th switching device is described series resonant converter
Electric current drops to for zero moment.
In one embodiment of this invention, said method also includes comparing sawtooth waveforms and the adjustable threshold value of amplitude, comes
Produce a pair of drive signal constituting bipolar modulation.
In one embodiment of this invention, connect by judging whether the cavity current of described series resonant converter reaches
Nearly zero threshold value is determining this shutoff moment.
In one embodiment of this invention, the dutycycle constituting a pair of drive signal of bipolar modulation is respectively less than 50%.
In one embodiment of this invention, described cavity current is discontinuous conduct mode, and when described inverter circuit is deposited
In switching device in the conduction state, described cavity current is in non-zero status；Derailing switch when described inverter circuit
Part is off state, and described cavity current is in zero state.
Compared with prior art, the present invention had both had bipolar modulation no Zero voltage vector, thus there is not continuous current circuit
Advantage, turn-off power loss is again the same with phase shift modulation, only the half of bipolar modulation；Additionally, leading-bridge and lagging leg
There is larger Dead Time, reduce the probability of bridge arm direct pass, improve the reliability of changer；On the other hand, pass through
Detection zero crossing, to produce cut-off signals, can make inverter circuit always work in discontinuous conduct mode, reduce turn-on consumption, and
Keep to high-tension transformer stray inductance LlkWith parasitic capacitance CwThe adaptability of fluctuation.
Brief description
Fig. 1 is the circuit diagram of the X-ray high-voltage generator based on series resonant converter.
Fig. 2 is the bipolar modulation oscillogram of series resonant inverter.
Fig. 3 is the phase shift modulation oscillogram of series resonant inverter.
Fig. 4 A and Fig. 4 B is the phase shift modulation oscillogram considering transformer parasitic capacitance impact.
Fig. 5 is the X-ray high-voltage generator circuit diagram based on series resonant converter of one embodiment of the invention.
Fig. 6 is the modulation waveform figure of the series resonant inverter of first embodiment of the invention.
Fig. 7 is the modulation waveform figure of the change case of embodiment illustrated in fig. 6.
Fig. 8 is the modulation waveform figure of the series resonant inverter of second embodiment of the invention.
Specific embodiment
It is that the above objects, features and advantages of the present invention can be become apparent, below in conjunction with the tool to the present invention for the accompanying drawing
Body embodiment elaborates.
Elaborate a lot of details in the following description in order to fully understand the present invention, but the present invention is acceptable
To be implemented different from alternate manner described here using other, therefore the present invention is not limited by following public specific embodiment
System.
Embodiments of the invention describe the series-resonant inverting circuit of X-ray high-voltage generator.X-ray high-voltage generator can
Sent out in such as roentgenotherapia equipment, x-ray diagnostic equipment, X ray computer layer radiography equipment (CT), positron with applying
Penetrate in the equipment such as computerized tomograph (PET-CT), but be not limited thereto.
Fig. 5 is that the series resonance of the X-ray high-voltage generator based on series resonant converter of one embodiment of the invention is inverse
Become the circuit diagram of device.With reference to shown in Fig. 5, the series resonant inverter of the X-ray high-voltage generator of the present embodiment includes inversion electricity
Road 51, series resonant circuit 52, transformator Tr and voltage doubling rectifing circuit 53.X-ray high-voltage generator is included for controlling series connection
The control circuit of controlled resonant converter.In the present embodiment, control circuit includes drive circuit 54.
Inverter circuit 51 includes first switch device Q1, second switch device Q2, the 3rd switching device Q3 and the 4th switch
Device Q4.First switch device Q1 and second switch device Q2 composition leading-bridge, brachium pontis midpoint A is as the of inverter circuit 51
One outfan.3rd switching device Q3 and the 4th switching device Q4 composition lagging leg, brachium pontis midpoint B is as inverter circuit 51
Second outfan.First switch device is, for example, insulated gate bipolar transistor (Insulated to the 4th switching device Q1-Q4
Gate Bipolar Transistor,IGBT).The colelctor electrode of first switch device Q1 connects the anode of power supply Vin, emitter stage
Connect brachium pontis midpoint A.The colelctor electrode of second switch device Q2 connects brachium pontis midpoint A, and emitter stage connects the negative terminal of power supply Vin.The
The colelctor electrode of three switching device Q3 connects the anode of power supply Vin, and emitter stage connects brachium pontis midpoint B.The collection of the 4th switching device Q4
Electrode connects brachium pontis midpoint A, and emitter stage connects the negative terminal of power supply Vin.Each switching device Q1-Q4 is respectively provided with parasitic diode
D1-D4.
Series resonant circuit 52 connects the first output terminals A of inverter circuit 51.1 series resonant circuit 52 for example includes inductance
Ls and electric capacity Cs.
Transformator Tr connects the second outfan B of series resonant circuit 52 and inverter circuit 51.Transformator Tr has and posts
Raw inductance LlkWith parasitic capacitance Cw.
Drive circuit 54 provides the first drive signal S1 to first switch device Q1, and the second drive signal S2 is to second switch
Device Q2, the 3rd drive signal S3 give the 3rd switching device Q3, and fourth drive signal Q3 gives the 4th switching device Q4.
First embodiment
According to the present embodiment, the leading-bridge of inverter circuit 51 adopts bipolar modulation, and lagging leg open with super
Front brachium pontis identical to managing, cut-off signals are then by detecting the realizing to zero-signal of series resonant circuit electric current.Fig. 6 is
The modulation waveform figure of the series resonant inverter of first embodiment of the invention.With reference to shown in Fig. 6, the first drive signal S1 and second
Drive signal S2 constitutes bipolar modulation；3rd drive signal S3 drives turn-on instant and second driving of the 3rd switching device Q3
Signal S2 drives the turn-on instant of second switch device Q2 identical, and fourth drive signal S4 drives the conducting of the 4th switching device Q4
Moment drives the turn-on instant of first switch device Q1 identical with the first drive signal S1.In addition, the 3rd drive signal S3 drives
The turn off moment and the shutoff moment of fourth drive signal S4 driving the 4th switching device Q4 of the 3rd switching device Q3 are according to institute
The cavity current stating series resonant converter determines.In order to make turn-off power loss less, can select less in inverter current
Moment turns off.For example, it is possible to set a threshold value, during by detecting that cavity current determines to turn off less than this threshold value
Carve.In order that turn-off power loss is minimum, it is humorous that the 3rd drive signal S3 drives the shutoff moment of the 3rd switching device Q3 preferably to connect
Shake changer electric current rise to zero moment.Fourth drive signal S4 drives the turn-on instant and first of the 4th switching device Q4
Drive signal S1 drives the turn-on instant of first switch device Q1 identical, and fourth drive signal S4 drives the 4th switching device Q4's
The electric current turning off moment preferably series resonant converter drops to for zero moment.It should be noted that in above process, drive
The turn-on instant of dynamic Signal-controlled switch device is drive signal rising edge time, during the shutoff of drive signal controlling switch device
Carve as the drive signal trailing edge moment.
First half cycle in switch periods：Switching device Q1, Q4 simultaneously turn on, and switching device Q2, Q3 are off
State, input voltage vin, switching device Q1, resonator cavity, switching device Q4 are composed in series loop, the voltage V of 2 points of A, BA,BFor
High level, the inverter current being exported by inverter circuit 51 or flow through the electric current of resonator cavity and be gradually increased (the electric current side in resonator cavity
To identical with scheduled current direction)；
Afterwards, only Q4 conducting, Q1, Q2, Q3 are simultaneously in off state, resonator cavity, switching device Q4, the second diode D2
It is composed in series loop, the voltage V of 2 points of A, BA,BFor zero level, and the electric discharge of resonator cavity series inductance, flow through the electric current of resonator cavity by
Decrescence little；
Afterwards, Q1, Q2, Q3, Q4 are simultaneously in off state, and only having electric capacity Cs two ends in resonator cavity has voltage, 2 points of A, B
Voltage VA,BFor electric capacity Cs both end voltage (high level), resonator cavity is not now had to flow through electric current；
The later half cycle in switch periods：Q2, Q3 simultaneously turn on, and Q1, Q4 are off state, input voltage vin,
Switching device Q3, resonator cavity, switching device Q2 are composed in series loop, the voltage V of 2 points of A, BA,BFor low level, defeated by inverter
The inverter current going out or the electric current flowing through resonator cavity are gradually increased (sense of current in resonator cavity is in opposite direction with scheduled current)；
Afterwards, only Q3 conducting, Q1, Q2, Q4 are simultaneously in off state, switching device Q3, resonator cavity, the first diode D1
It is composed in series loop, the voltage V of 2 points of A, BA,BFor zero level, and the electric discharge of resonator cavity series inductance, flow through the electric current of resonator cavity by
Decrescence little；
Afterwards, Q1, Q2, Q3, Q4 are simultaneously in off state, and only having electric capacity Cs two ends in resonator cavity has voltage, 2 points of A, B
Voltage VA,BFor electric capacity Cs both end voltage (low level), electric current is not now had to flow through resonator cavity；
Drive circuit 54 can pass through sawtooth signal VtriWith threshold value VmodRelatively, to produce and to constitute bipolar modulation
A pair of drive signal S1 and S2.For this reason, drive circuit 54 may include first comparator, one input inputs sawtooth signal
Vtri, another input input gate limit value Vmod.Threshold value VmodAmplitude can be adjustable, so can control drive signal
The dutycycle of S1 and S2.The dutycycle preferably constituting a pair of drive signal S1, S2 of bipolar modulation is respectively less than 50%.
Corresponding to minimum turn-off loss, drive circuit 54 passes through to judge the cavity current i of series resonant converterLs_meas
Whether reach the threshold value close to zero to determine this shutoff moment.
In change case shown in Fig. 7, drive circuit 54 can also judge the cavity current of series resonant converter
iLs_measPostpone a scheduled time as the shutoff moment after the moment reaching threshold value.
In the present embodiment, cavity current be discontinuous conduct mode, and when inverter circuit exist in the conduction state
During switching device, cavity current is in non-zero status；When the switching device of inverter circuit is off state, cavity current
It is in zero state.
In the present embodiment, by detecting cavity current iLs_measTo produce to zero-signal guarantee that lagging leg exists
Electric current turns off, thus realizing the zero-current switching of lagging leg (Q3 and Q4) after dropping to zero again.And now will no no-voltage
Vector loop, during there is not afterflow there is vibration in series inductance and series capacitance, and electric current will be always zero, Zhi Daoyou
Other switching devices are open-minded, thus it is also ensured that the zero current turning-on of switching device.Therefore, the present embodiment both had bipolar
Property modulation no Zero voltage vector and there is no continuous current circuit, turn-off power loss again, only bipolarity the same with phase shift modulation
The half of modulation；Additionally, leading-bridge and lagging leg have larger Dead Time, reduce the probability of bridge arm direct pass,
Improve the reliability of inverter circuit；On the other hand, produce cut-off signals by detecting zero crossing, inverter circuit can be made to begin
It is operated in discontinuous conduct mode eventually, reduce turn-on consumption, and keep to high-tension transformer stray inductance LlkWith parasitic capacitance CwRipple
Dynamic adaptability.
Second embodiment
According to the present embodiment, switching device Q1 and Q3 of inverter circuit 51 adopts bipolar modulation, switching device Q2 with open
Close device Q3 turn-on instant identical, switching device Q4 is identical with the turn-on instant of switching device Q1, second switch device Q2 with
The cut-off signals of the 4th switching device Q4 be then by detect series resonant converter cavity current to zero-signal come reality
Existing.Fig. 8 is the modulation waveform figure of the series resonant converter of second embodiment of the invention.With reference to shown in Fig. 8, first drives letter
Number S1 and the 3rd drive signal S3 constitutes bipolar modulation；Second drive signal S2 drives the turn-on instant of second switch device Q2
Identical with the turn-on instant that the 3rd drive signal S3 drives the 3rd switching device Q3, fourth drive signal S4 drives the 4th derailing switch
The turn-on instant of part Q4 drives the turn-on instant of first switch device Q1 identical with the first drive signal S1.In addition, the second driving
During the shutoff of the shutoff moment of signal S2 driving second switch device Q2 and fourth drive signal S4 driving the 4th switching device Q4
Quarter is that the cavity current according to described series resonant converter determines.In order to make turn-off power loss less, can select in inversion
The electric current less moment turns off.For example, it is possible to set a threshold value, determined less than this threshold value by detecting cavity current
Surely turn off the moment.In order that turn-off power loss is minimum, the second drive signal S2 drives the shutoff moment of second switch device Q2 preferable
Electric current for series resonant converter rises to for zero moment, when fourth drive signal S4 drives the shutoff of the 4th switching device Q4
The electric current carving preferably series resonant converter drops to for zero moment.
First half cycle in switch periods：Switching device Q1, Q4 simultaneously turn on, and switching device Q2, Q3 are off
State, input voltage vin, switching device Q1, resonator cavity, switching device Q4 are composed in series loop, the voltage V of 2 points of A, BA,BFor
High level, the inverter current being exported by inverter circuit 51 or flow through the electric current of resonator cavity and be gradually increased (the electric current side in resonator cavity
To identical with scheduled current direction)；
Afterwards, only switching device Q4 conducting, switching device Q1, Q2, Q3 are simultaneously in off state, resonator cavity, derailing switch
Part Q4, the second diode D2 are composed in series loop, the voltage V of 2 points of A, BA,BFor zero level, and the electric discharge of resonator cavity series inductance,
The electric current flowing through resonator cavity is gradually reduced；
Afterwards, switching device Q1, Q2, Q3, Q4 is simultaneously in off state, and only having electric capacity Cs two ends in resonator cavity has electricity
Pressure, the voltage V of 2 points of A, BA,BFor electric capacity Cs both end voltage (high level), resonator cavity is not now had to flow through electric current；
The later half cycle in switch periods：Switching device Q2, Q3 simultaneously turn on, and switching device Q1, Q4 are off
State, input voltage vin, switching device Q3, resonator cavity, switching device Q2 are composed in series loop, the voltage V of 2 points of A, BA,BFor
Low level, the inverter current being exported by inverter or flow through resonator cavity electric current be gradually increased (sense of current in resonator cavity with
Scheduled current is in opposite direction)；
Afterwards, only switching device Q2 conducting, switching device Q1, Q3, Q4 are simultaneously in off state, switching device Q2, humorous
Shake chamber, the 4th diode D4 is composed in series loop, the voltage V of 2 points of A, BA,BFor zero level, and the electric discharge of resonator cavity series inductance,
The electric current flowing through resonator cavity is gradually reduced；
Afterwards, switching device Q1, Q2, Q3, Q4 is simultaneously in off state, and only having electric capacity Cs two ends in resonator cavity has electricity
Pressure, the voltage V of 2 points of A, BA,BFor electric capacity Cs both end voltage (low level), electric current is not now had to flow through resonator cavity.
Drive circuit 54 can pass through sawtooth signal VtriWith threshold value VmodRelatively, to produce and to constitute bipolar modulation
For this reason, drive circuit 54 may include first comparator, one input inputs sawtooth signal to a pair of drive signal S1 and S3
Vtri, another input input gate limit value Vmod.Threshold value VmodAmplitude can be adjustable, so can control drive signal
The dutycycle of S1 and S3.The dutycycle preferably constituting a pair of drive signal S1, S3 of bipolar modulation is respectively less than 50%.
Corresponding to minimum turn-off loss, drive circuit 54 passes through to judge the cavity current i of series resonant converterLs_meas
Whether reach the threshold value close to zero to determine this shutoff moment.
Drive circuit 54 can also judge the cavity current i of series resonant converterLs_measReach the moment of threshold value
After postpone a scheduled time as turn off the moment.
In the present embodiment, cavity current be discontinuous conduct mode, and when inverter circuit exist in the conduction state
During switching device, cavity current is in non-zero status；When the switching device of inverter circuit is off state, cavity current
It is in zero state.
In the present embodiment, there is turn-off power loss when turning off in switching device Q1 and Q3, and turn-off power loss is in lead-lag two
Brachium pontis evenly distributes, and this can be substantially reduced the temperature rise of switching device for using half-bridge module as the occasion of switching device.
With previous embodiment identical be, no Zero voltage vector loop in the present embodiment, during there is not afterflow series inductance with connect
There is the problem of vibration in electric capacity, electric current will be always zero, until there being other switching devices open-minded, thus it is also ensured that switching
The zero current turning-on of device.Therefore, the present embodiment had both had bipolar modulation no Zero voltage vector and there is not continuous current circuit
Advantage, turn-off power loss is again the same with phase shift modulation, only the half of bipolar modulation；Additionally, leading-bridge and lagging leg are all
There is larger Dead Time, reduce the probability of bridge arm direct pass, improve the reliability of inverter circuit；On the other hand, pass through
Detection zero crossing, to produce cut-off signals, can make inverter circuit always work in discontinuous conduct mode, reduce turn-on consumption, and
Keep to high-tension transformer stray inductance LlkWith parasitic capacitance CwThe adaptability of fluctuation.
From another viewpoint, the present invention proposes a kind of control method of series resonant converter, described series resonance conversion
Device includes inverter circuit, and described inverter circuit includes leading-bridge and lagging leg, and described leading-bridge includes first switch device
Part and second switch device, described lagging leg includes the 3rd switching device and the 4th switching device, and methods described includes：There is provided
First drive signal gives described first switch device, provides the second drive signal to described second switch device, provides the 3rd drive
Dynamic signal gives described 3rd switching device, provides fourth drive signal to described 4th switching device；Wherein said first driving
Signal and described second drive signal constitute bipolar modulation, and described 3rd drive signal and described fourth drive signal drive institute
State the 3rd switching device and the turn-on instant of the 4th switching device drives letter with described second drive signal and described first respectively
Number drive described second switch device identical with the turn-on instant of first switch device, described 3rd drive signal and the described 4th
The shutoff moment of drive signal described 3rd switching device of driving and the 4th switching device is according to described series resonant converter
Cavity current determine；Or described first drive signal and described 3rd drive signal constitute bipolar modulation, described the
The turn-on instant of two driving signal and the described fourth drive signal described second switch device of driving and the 4th switching device is respectively
Drive the conducting of described 3rd switching device and first switch device with described 3rd drive signal and described first drive signal
Moment is identical, and described second drive signal and described fourth drive signal drive described second switch device and the 4th switching device
The shutoff moment be to be determined according to the cavity current of described series resonant converter.
In one embodiment of this invention, described 3rd drive signal drive described 3rd switching device the shutoff moment be
The cavity current of described series resonant converter rises to for zero moment, and described fourth drive signal drives described 4th switch
Device turn off the moment be this series resonant converter cavity current drop to zero moment；Or described second drives letter
Number drive described second switch device turn off the moment be described series resonant converter cavity current rise to zero when
Carve, described fourth drive signal drives the resonator cavity that the shutoff moment of described 4th switching device is described series resonant converter
Electric current drops to for zero moment.
In one embodiment of this invention, said method also includes comparing sawtooth waveforms and the adjustable threshold value of amplitude, comes
Produce a pair of drive signal constituting bipolar modulation.
In one embodiment of this invention, connect by judging whether the cavity current of described series resonant converter reaches
Nearly zero threshold value is determining this shutoff moment.
In one embodiment of this invention, the dutycycle constituting a pair of drive signal of bipolar modulation is respectively less than 50%.
Although the present invention to describe with reference to current specific embodiment, those of ordinary skill in the art
It should be appreciated that above embodiment is intended merely to the present invention is described, also can make in the case of without departing from present invention spirit
Go out various equivalent change or replacement, therefore, as long as to the change of above-described embodiment, change in the spirit of the present invention
Type all will fall in the range of following claims.
Claims (10)
1. a kind of control circuit of series resonant converter, described series resonant converter includes inverter circuit, described inversion electricity
Road includes leading-bridge and lagging leg, and described leading-bridge includes first switch device and second switch device, described delayed
Brachium pontis includes the 3rd switching device and the 4th switching device, and described control circuit includes：
Drive circuit, provides the first drive signal to described first switch device, provides the second drive signal to open to described second
Close device, provide the 3rd drive signal to described 3rd switching device, provide fourth drive signal to described 4th switching device；
Wherein：Described first drive signal and described second drive signal constitute bipolar modulation, and described 3rd drive signal drives
The turn-on instant moving described 3rd switching device drives the turn-on instant of second switch device identical with described second drive signal,
Described fourth drive signal drives the turn-on instant of described 4th switching device and described first drive signal to drive first switch
The turn-on instant of device is identical, and described 3rd drive signal and described fourth drive signal drive described 3rd switching device and the
The shutoff moment of four switching devices is that the inverter current according to described inverter circuit determines；
Or, described first drive signal and described 3rd drive signal constitute bipolar modulation, and described second drive signal drives
Move the turn-on instant of described second switch device and described 3rd drive signal drives the turn-on instant of described 3rd switching device
Identical, described fourth drive signal drives the turn-on instant of described 4th switching device described with described first drive signal driving
The turn-on instant of first switch device is identical, and described second drive signal and described fourth drive signal drive described second switch
The moment that turns off of device and the 4th switching device determines according to the cavity current of described series resonant converter.
2. the control circuit of series resonant converter as claimed in claim 1 is it is characterised in that described 3rd drive signal drives
That moves described 3rd switching device turns off the moment that the cavity current that the moment is described series resonant converter rises to zero, institute
Stating fourth drive signal and driving the moment that turns off of described 4th switching device is under the cavity current of this series resonant converter
Drop to for zero moment；
Or, it is described series resonant converter that described second drive signal drives the moment that turns off of described second switch device
Cavity current rises to for zero moment, and it is described that described fourth drive signal drives the shutoff moment of described 4th switching device
The cavity current of series resonant converter drops to for zero moment.
3. the control circuit of series resonant converter according to claim 1 and 2 is it is characterised in that described drive circuit
By comparing sawtooth waveforms and the adjustable threshold value of amplitude, to produce a pair of drive signal constituting bipolar modulation.
4. the control circuit of series resonant converter according to claim 3 is it is characterised in that constitute bipolar modulation
The dutycycle of a pair of drive signal is respectively less than 50%.
5. a kind of X-ray high-voltage generator, including series resonant converter, and the string as described in any one of claim 1-6
Join the control circuit of controlled resonant converter, and the resonator cavity of the described control circuit described series resonant converter of control is in electric current and breaks
Discontinuous Conduction mode.
6. a kind of control method of series resonant converter, described series resonant converter includes inverter circuit, described inversion electricity
Road includes leading-bridge and lagging leg, and described leading-bridge includes first switch device and second switch device, described delayed
Brachium pontis includes the 3rd switching device and the 4th switching device, and methods described includes：
There is provided the first drive signal to described first switch device, provide the second drive signal to described second switch device, carry
Give described 3rd switching device for the 3rd drive signal, provide fourth drive signal to described 4th switching device；
Wherein said first, second drive signal drives described leading-bridge to carry out bipolar modulation, described 3rd drive signal
When driving the turn-on instant of described 3rd switching device to drive the conducting of described second switch device with described second drive signal
Carve identical, described fourth drive signal drives the turn-on instant of described 4th switching device and described first drive signal to drive institute
The turn-on instant stating first switch device is identical, the described 3rd, fourth drive signal drive described three, the 4th switching devices
Turn off the inverter current determination according to described inverter circuit for the moment；Or,
Described first, the 3rd drive signal constitutes bipolar modulation, and described second drive signal drives described second switch device
Turn-on instant with described 3rd drive signal drive described 3rd switching device turn-on instant identical, described 4th drive letter
Number drive described 4th switching device turn-on instant with described first drive signal drive described first switch device conducting
Moment is identical, described second, fourth drive signal drive described second, the 4th switching device the shutoff moment according to described string
The cavity current of connection controlled resonant converter determines.
7. the control method of series resonant converter as claimed in claim 6 is it is characterised in that described 3rd drive signal drives
That moves described 3rd switching device turns off the moment that the cavity current that the moment is described series resonant converter rises to zero, institute
Stating fourth drive signal and driving the moment that turns off of described 4th switching device is under the cavity current of this series resonant converter
Drop to for zero moment；
Or, it is described series resonant converter that described second drive signal drives the moment that turns off of described second switch device
Cavity current rises to for zero moment, and it is described that described fourth drive signal drives the shutoff moment of described 4th switching device
The cavity current of series resonant converter drops to for zero moment.
8. the control method of series resonant converter as claimed in claim 7 is it is characterised in that also include sawtooth waveforms and width
Spend adjustable threshold value to compare, to produce a pair of drive signal constituting bipolar modulation.
9. the control method of series resonant converter as claimed in claim 8 is it is characterised in that pass through to judge that described series connection is humorous
Whether the cavity current of changer of shaking reaches threshold value to determine this shutoff moment.
10. the control method of the series resonant converter as described in any one of claim 6,7 or 9 is it is characterised in that described humorous
The cavity current that shakes is discontinuous conduct mode, and when described inverter circuit has switching device in the conduction state, described resonance
Cavity current is in non-zero status；When the switching device of described inverter circuit is off state, described cavity current is in zero
State.
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