CN107070234A - The control circuit and control method of series resonant converter - Google Patents

The control circuit and control method of series resonant converter Download PDF

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Publication number
CN107070234A
CN107070234A CN201710188536.4A CN201710188536A CN107070234A CN 107070234 A CN107070234 A CN 107070234A CN 201710188536 A CN201710188536 A CN 201710188536A CN 107070234 A CN107070234 A CN 107070234A
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switch
drive signal
switching device
bridge arm
cycle
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CN201710188536.4A
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CN107070234B (en
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祝国平
褚旭
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Shanghai Advanced Research Institute of CAS
Shanghai United Imaging Healthcare Co Ltd
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Shanghai Advanced Research Institute of CAS
Shanghai United Imaging Healthcare Co Ltd
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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
    • H02M3/33569—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
    • 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
    • H05G1/10—Power supply arrangements for feeding the X-ray tube
    • H05G1/12—Power supply arrangements for feeding the X-ray tube with dc or rectified single-phase ac or double-phase
    • 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
    • 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
    • H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
    • 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

Abstract

The application provides a kind of control circuit of series resonant converter, and series resonant converter includes inverter circuit, and inverter circuit includes left side bridge arm and the right bridge arm, and left side bridge arm and the right bridge arm are respectively comprising two switching devices, and control circuit includes：Drive circuit, drive signal is provided for the switching device of inverter circuit, drive signal is used to carry out switching device periodic modulation, and periodic modulation at least includes a switch periods, and the switching device of inverter circuit has once hard shut-off in a switch periods.The control circuit of the application can effectively reduce the turn-off power loss of switching device, improve inverter circuit reliability.Meanwhile, the application also proposes a kind of control method of series resonant converter.

Description

The control circuit and control method of series resonant converter
Technical field
Present application relates generally to for X-ray high-voltage generator, the series connection of more particularly, to X-ray high-voltage generator is humorous Shake the control circuit and control method of converter.
Background technology
X-ray high-voltage generator is used for roentgenotherapia equipment, x-ray diagnostic equipment, X ray computer layer radiography and set In the equipment such as standby (CT), Positron Emission Computed Tomography (PET-CT).In the inversion of high power x-ray high pressure generator In circuit, in order to meet the requirement worked long hours, generally from insulated gate bipolar switching device (Insulated Gate Bipolar Transistor, IGBT) it is used as switching device.In practical application, on the one hand in order to ensure IGBT reliably working, Its switching frequency can not select too high；On the other hand, in order to reduce the volume of high pressure generator and rectifying part, converter is improved Power density, switching frequency can not select too low.At the same time, X-ray tube is as the load of high pressure generator, and it has 60kV~140kV wide-range voltage and 10mA~420mA wide scope electric current.Further, in order to improve high pressure generator Compatibility, it needs to adapt to the electric scopes of a variety of different nets, and the typical electric scope of net includes 400VAC (- 20%~+10%) With 480VAC (- 15%~+15%) etc..
Resonance (including series parallel resonance) inverter circuit can by the use of the leakage inductance of high-tension transformer as series resonance inductor, every Straight electric capacity is as series resonant capacitance, and without output inductor, circuit components are few, simple in construction, it is adaptable to which X-ray is high Press generator.Under normal circumstances, pulsewidth modulation (Pulse Width Modulation, PWM) is the main of resonance inversion circuit Modulating mode.For the resonance inversion circuit using PWM, by adjusting IGBT dutycycle high pressure generator can be made to exist Under one of a relatively high switching frequency, while ensureing the volume of high-tension transformer and rectification circuit, and the wide electricity of X-ray tube is met The demand of current voltage scope.
However, PWM LC series-resonant invertings circuit exist a subject matter be IGBT switching loss it is larger, Cause its heating serious.For example when using bipolarity PWM mode, the oblique switch that carried out simultaneously to pipe of inverter circuit is moved Make, disconnect loss greatly, and inverter circuit energy feedback accounting is larger, causes peak point current larger.For being adjusted using phase-shift PWM The dutycycle of left and right bridge arm is all 50% in the inverter circuit of system, inverter circuit, changes the phase-adjustable section output of left and right bridge arm Voltage, disconnects loss compared to the reduction of bipolarity PWM.But, because the high-tension transformer high-pressure side number of turn is more, distribution capacity It is larger, and be present Zero voltage vector in phase-shift PWM modulation inverter bridge, the distribution capacity meeting of high-tension transformer and connect humorous during this period Resonance occurs for the inductance that shakes, and is distorted voltage current waveform, increases IGBT switching loss.For using asymmetric bipolarity The inverter circuit of PWM a, bridge arm uses bipolar modulation, and another bridge arm can use and fix 50% duty ratio modulation, Both it can ensure that switching loss was suitable with phase-shift PWM modulation, Zero voltage vector is not present again, can effectively suppress high-tension transformer The vibration that distribution capacity is introduced.But, asymmetric bipolarity PWM still has the problem of switching loss is serious, Mei Gekai The positive-negative half-cycle IGBT in pass cycle will carry out high current and disconnect firmly.
Based on this, it is necessary to which the modulation system to existing resonance inversion circuit is improved, to reduce IGBT switching losses.
The content of the invention
The application technical problem to be solved is to provide a kind of modulator approach of series-resonant inverting circuit, overcomes existing string The problem of joining controlled resonant converter modulation system.
In order to solve the above technical problems, according to the one side of the application, there is provided a kind of control of series resonant converter electricity Road, the series resonant converter includes inverter circuit, and the inverter circuit includes left side bridge arm and the right bridge arm, the left side Bridge arm and the right bridge arm are respectively comprising two switching devices, and the control circuit includes：
Drive circuit, provides drive signal, the drive signal is used for described for the switching device of the inverter circuit Switching device carries out periodic modulation, and the periodic modulation at least includes a switch periods, and in one switch week In phase there is once hard shut-off in the switching device of the inverter circuit, wherein,
In the positive half period of a switch periods, the drive circuit drives a switching device of the left side bridge arm to enter Row PWM, drives two switching devices of the right bridge arm to set duty cycle；
In the negative half-cycle of a switch periods, the drive circuit drives the switch of the left side bridge arm and the right bridge arm Device, makes the series resonant converter be operated in free-run mode.
Further, the left side bridge arm includes first switch device and second switch device, and the right bridge arm includes 3rd switching device and the 4th switching device, the drive circuit provide the first drive signal to the first switch device, carry For the second drive signal, to the second switch device, there is provided the 3rd drive signal, to the 3rd switching device, there is provided the 4th Drive signal gives the 4th switching device, and the equivalent voltage transmission gain of the inverter circuit is more than 0.5：
In the positive half period of a switch periods, first drive signal drives the first switch device to carry out PWM Modulation, the fourth drive signal drives the 4th switching device to set duty cycle；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to be accounted for set Sky is than work, and the 3rd drive signal drives the 3rd switching device to set duty cycle.
Further, the left side bridge arm includes first switch device and second switch device, and the right bridge arm includes 3rd switching device and the 4th switching device, the drive circuit provide the first drive signal to the first switch device, carry For the second drive signal, to the second switch device, there is provided the 3rd drive signal, to the 3rd switching device, there is provided the 4th Drive signal gives the 4th switching device, and the equivalent voltage transmission gain of the inverter circuit is less than 0.5：Described first drives Dynamic signal drives the first switch device to be off；
In the positive half period of a switch periods, the fourth drive signal drives the 4th switching device to be accounted for set Sky compares work；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to carry out PWM Modulation, the 3rd drive signal drives the 3rd switching device to set duty cycle.
A kind of control circuit of series resonant converter, the series resonance conversion are proposed according to the another aspect of the application Device includes inverter circuit, and the inverter circuit includes left side bridge arm and the right bridge arm, the left side bridge arm and the right bridge arm Respectively comprising two switching devices, the control circuit includes：
Drive circuit, provides drive signal, the drive signal is used for described for the switching device of the inverter circuit Switching device carries out periodic modulation, and the periodic modulation at least includes a switch periods, and in one switch week In phase there is once hard shut-off in the switching device of the inverter circuit, wherein,
In the positive half period of a switch periods, the drive circuit drive two switching devices of the left side bridge arm with Duty cycle is set, drives a switching device of the right bridge arm to carry out PWM；
In the negative half-cycle of a switch periods, the drive circuit drives the switch of the left side bridge arm and the right bridge arm Device, makes the series resonant converter be operated in free-run mode.
Further, the left side bridge arm includes first switch device and second switch device, and the right bridge arm includes 3rd switching device and the 4th switching device, the drive circuit provide the first drive signal to the first switch device, carry For the second drive signal, to the second switch device, there is provided the 3rd drive signal, to the 3rd switching device, there is provided the 4th Drive signal gives the 4th switching device, and the equivalent voltage transmission gain of the inverter circuit is more than 0.5：
In the positive half period of a switch periods, first drive signal drives the first switch device to be accounted for set Sky is than work, and the fourth drive signal drives the 4th switching device to carry out PWM；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to be accounted for set Sky is than work, and the 3rd drive signal drives the 3rd switching device to set duty cycle.
Further, the left side bridge arm includes first switch device and second switch device, and the right bridge arm includes 3rd switching device and the 4th switching device, the drive circuit provide the first drive signal to the first switch device, carry For the second drive signal, to the second switch device, there is provided the 3rd drive signal, to the 3rd switching device, there is provided the 4th Drive signal gives the 4th switching device, and the equivalent voltage transmission gain of the inverter circuit is less than 0.5：The 4 wheel driven Dynamic signal drives the 4th switching device to be off；
In the positive half period of a switch periods, first drive signal drives the first switch device to be accounted for set Sky compares work；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to be accounted for set Sky is than work, and the 3rd drive signal drives the 3rd switching device to carry out PWM.
According to the another aspect of the application, a kind of control method of series resonant converter is proposed, the series resonance becomes Parallel operation includes inverter circuit, and the inverter circuit includes left side bridge arm and the right bridge arm, the left side bridge arm and the right bridge arm point Not Bao Han two switching devices, the control method includes：
Drive signal is provided for the switching device of the inverter circuit, the drive signal driving switch device enters line period Property be turned on or off, the periodic modulation at least include first switch cycle and second switch cycle, wherein,
In the positive half period in first switch cycle, the drive circuit drives a switching device of the left side bridge arm to enter Row PWM, drives two switching devices of the right bridge arm to set duty cycle；
In the negative half-cycle in first switch cycle, the drive circuit drives the switch of the left side bridge arm and the right bridge arm Device, makes the series resonant converter be operated in free-run mode；
In the positive half period in second switch cycle, the drive circuit drive two switching devices of the left side bridge arm with Duty cycle is set, drives a switching device of the right bridge arm to carry out PWM；
In the negative half-cycle in second switch cycle, the drive circuit driving switch device converts the series resonance Device is operated in free-run mode.
Further, the left side bridge arm includes first switch device and second switch device, and the right bridge arm includes 3rd switching device and the 4th switching device, and there is provided the second driving to the first switch device for the first drive signal of offer Signal is given there is provided the 3rd drive signal to the second switch device to the 3rd switching device there is provided fourth drive signal 4th switching device, wherein,
In the positive half period in first switch cycle, first drive signal drives the first switch device to carry out PWM Modulation, the fourth drive signal drives the 4th switching device to set duty cycle；
In the negative half-cycle in first switch cycle, second drive signal drives the second switch device to be accounted for set Sky is than work, and the 3rd drive signal drives the 3rd switching device to set duty cycle；
In the positive half period in second switch cycle, first drive signal drives the first switch device to be accounted for set Sky is than work, and the fourth drive signal drives the 4th switching device to carry out PWM；
In the negative half-cycle in second switch cycle, second drive signal drives the second switch device to be accounted for set Sky is than work, and the 3rd drive signal drives the 3rd switching device to set duty cycle.
Further, the left side bridge arm includes first switch device and second switch device, and the right bridge arm includes 3rd switching device and the 4th switching device, and there is provided the second driving to the first switch device for the first drive signal of offer Signal is given there is provided the 3rd drive signal to the second switch device to the 3rd switching device there is provided fourth drive signal 4th switching device, wherein：First drive signal drives the first switch device to be off；
In the positive half period in first switch cycle, the fourth drive signal drives the 4th switching device to be accounted for set Sky compares work；
In the negative half-cycle in first switch cycle, second drive signal drives the second switch device to carry out PWM Modulation, the 3rd drive signal drives the 3rd switching device to set duty cycle；
In the positive half period in second switch cycle, the fourth drive signal drives the 4th switching device to be accounted for set Sky compares work；
In the negative half-cycle in second switch cycle, second drive signal drives the second switch device to be accounted for set Sky is than work, and the 3rd drive signal drives the 3rd switching device to carry out PWM.
Further, the dutycycle that sets is 50%.
Compared with prior art, the control method of the application series resonant converter is only being opened in a switch periods The positive half period or negative half-cycle in pass cycle carry out PWM by drive signal to switching device；And in another half period, Series resonant circuit is operated in free-run mode by drive signal controlling switch device, by such as upper type resonance is become It is not present in the circuit of parallel operation, simultaneously switches off loss again than its reduction close to half, so as to significantly reduce IGBT heating, Ensure inverter circuit it is safe and reliable work in of a relatively high switching frequency.
Brief description of the drawings
Figure 1A is the circuit diagram of the X-ray high-voltage generator based on series resonant converter of the embodiment of the application one；
Figure 1B is the circuit diagram of the X-ray high-voltage generator based on series resonant converter of another embodiment of the application；
Fig. 2 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 1；
Fig. 3 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 2；
Fig. 4 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 3；
Fig. 5 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 4；
Fig. 6 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 5；
Fig. 7 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 6.
Embodiment
For the above-mentioned purpose of the application, feature and advantage can be become apparent, below in conjunction with tool of the accompanying drawing to the application Body embodiment elaborates.
Many details are elaborated in the following description to fully understand the application, but the application can be with It is different from other manner described here using other and implements, therefore the application do not limited by following public specific embodiment System.
Embodiments herein describes the series-resonant inverting circuit of X-ray high-voltage generator.X-ray high-voltage generator can To apply in such as roentgenotherapia equipment, x-ray diagnostic equipment, X ray computer layer radiography equipment (CT), positive electron hair Penetrate in the equipment such as computerized tomograph (PET-CT), but be not limited thereto.
Figure 1A is that the series resonance of the X-ray high-voltage generator based on series resonant converter of the embodiment of the application one is inverse Become the circuit diagram of device.As shown in reference to Fig. 1 a, the series resonant inverter of the X-ray high-voltage generator of the present embodiment includes inversion Circuit 11, series resonant circuit 12, transformer Tr and voltage doubling rectifing circuit 13, inverter circuit can control the electric current in resonator iLs, the output current i of voltage doubling rectifing circuit 13andAnd icathThe anode and negative electrode that can be respectively high pressure generator provide electric current, and X-ray high-voltage generator includes the control circuit for being used to control series resonant converter.Further, transformer Tr and times repoussage The transformer included in current circuit 13 uses anode and cathode separate structure.
It should be noted that the equivalent voltage transmission gain of series-resonant inverting circuit can be by the dutycycle of drive signal Characterize, can also be determined by the input of series-resonant inverting circuit, the ratio of output voltage.In one embodiment, inversion is worked as The voltage duty cycle of a bridge arm is less than 50% in circuit, then inverter circuit equivalent voltage transmission gain M<0.5；Work as inverter circuit In the voltage duty cycle of a bridge arm be more than 50%, then inverter circuit equivalent voltage transmission gain M>0.5.In another embodiment In, when output voltage and the input voltage ratio of series-resonant inverting circuit are less than 0.5, then inverter circuit equivalent voltage transmission increases Beneficial M<0.5；When output voltage and the input voltage ratio of series-resonant inverting circuit are more than 0.5, then inverter circuit equivalent voltage Transmission gain M>0.5.
Figure 1B is the series resonance of the X-ray high-voltage generator based on series resonant converter of another embodiment of the application The circuit diagram of inverter.With the electricity of the series resonant inverter of the above-mentioned X-ray high-voltage generator based on series resonant converter The difference of road figure is that the transformer in transformer Tr and voltage doubling rectifing circuit 13 uses anode and cathode integrated structure.
Circuit is controlled to include drive circuit 14, inverter circuit includes one or more switching devices, and drive circuit 14 is The switching device of inverter circuit 11 provides drive signal, and the drive signal, which is used for driving switch device, to carry out periodically leading on-off Open.
When switching device is in the conduction state, the switching device can bear high forward current, be intended to infinity； Forward conduction voltage drop is sufficiently low, is intended to zero；Conducting resistance is sufficiently low, is intended to zero, conduction loss also tends to zero.Work as switch When device is in state, switching device can bear high forward direction and backward voltage, be intended to infinity；Off-state (disconnection) leaks electricity Stream is sufficiently low, is intended to zero；Turn off resistance sufficiently high, be intended to infinity, turn-off power loss is intended to zero.
In this embodiment, inverter circuit 11 includes first switch device Q1, second switch device Q2, the 3rd switching device Q3With the 4th switching device Q4.First switch device Q1With second switch device Q2Constitute left side bridge arm (leading-bridge), left side bridge The bridge arm midpoint A of arm as inverter circuit 11 the first output end.3rd switching device Q3With the 4th switching device Q4Composition the right Bridge arm (lagging leg), the bridge arm midpoint B of the right bridge arm as inverter circuit 11 the second output end.
First switch device Q1To the 4th switching device Q4Can be insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), double pole triode (Bipolar Junction Transistor, BJT) or insulation Grid-type FET (Insulated Gate Field Effect Transistor, IGFET) etc..In this embodiment, open Close device selection IGBT.First switch device Q1Colelctor electrode connection power supply VinAnode, emitter stage connection bridge arm midpoint A.The Two switching device Q2Colelctor electrode connection bridge arm midpoint A, emitter stage connection power supply VinNegative terminal.3rd switching device Q3Current collection Pole connection power supply VinAnode, emitter stage connection bridge arm midpoint B.4th switching device Q4Colelctor electrode connection bridge arm midpoint A, hair Emitter-base bandgap grading connection power supply VinNegative terminal.Each switching device Q1-Q4There is parasitic diode D respectively1-D4。
Series resonant circuit 12 includes resonator, and connects the first output terminals A of inverter circuit 11.Alternatively, connect humorous The circuit 12 that shakes may include inductance Ls and electric capacity Cs.
Second output end B of transformer Tr connections series resonant circuit 12 and inverter circuit 11.Transformer Tr, which has, to be posted Raw inductance LlkWith parasitic capacitance Cw。
Drive circuit 14 provides the first drive signal S1Give first switch device Q1There is provided the second drive signal S2To second Switching device Q2There is provided the 3rd drive signal S3To the 3rd switching device Q3There is provided fourth drive signal Q4To the 4th switching device Q4, so that inverter circuit only carries out a PWM action in a switch periods in positive half period or negative half-cycle, and it is another Half period series resonant circuit is operated in free-run mode.In one embodiment, drive circuit provides drive signal driving Inverter circuit carries out PWM in the positive half period of a switch periods；And in negative half-cycle, drive signal driving inverter circuit It is operated in free-run mode.In another embodiment, drive circuit provides drive signal driving inverter circuit and opened at one The positive half period in pass cycle is operated in free-run mode；And in negative half-cycle, drive signal driving inverter circuit carries out PWM tune System.Alternatively, above-mentioned modulating mode can periodically carry out or two kinds of embodiments involved by modulation system alternately.
Embodiment 1
In this embodiment, drive signal is used for driving switch device progress periodic modulation (driving switch device progress Periodically it is turned on or off), and periodic modulation at least includes switch periods, and inverter circuit is only in each switch periods There is a hard shut-off in one switching device.In the positive half period of a switch periods, the driving left side bridge arm of drive circuit 14 One switching device carries out two switching devices of bridge arm on the right of PWM, driving to set duty cycle；In a switch The negative half-cycle in cycle, the driving switch device of drive circuit 14, makes series resonant converter be operated in free-run mode.Need Illustrate, " positive half period " is also referred to as " first half cycle " in this application, " negative half-cycle " is also referred to as " second half Phase ".It should be noted that when drive signal is high level, switch device conductive, when drive signal is low level, switching device Disconnect, i.e. action of the drive signal with switching organ is consistent.Therefore, in this application, switch periods may refer to driving letter Number cycle, may also indicate that switching device is periodically turned on or off.
In series-resonant inverting circuit equivalent voltage transmission gain M>When 0.5, the first switch device of left side bridge arm can control Part Q1It is operated in PWM mode, and a switch periods only carry out a PWM action in positive half cycle, the of control left side bridge arm Two switching device Q2Worked in the negative half period of a switch periods with 50% fixed duty cycle；Belong to the right bridge arm the 3rd opens Close device, the 4th switching device all to work with 50% complementary duty cycle, only retain certain dead time to avoid leading directly to.Fig. 2 It is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 1, the corresponding circuit of series resonant inverter can be correspondingly attached Fig. 1, wherein：Transverse axis represents the time (unit is s)；The longitudinal axis is expressed as drive signal S from top to bottom1、S2、S3And S4Voltage wave Shape, the voltage difference V between A and BAB, flow through the electric current i of resonatorLs.It should be noted that in this embodiment, inverter circuit The dutycycle of middle left side bridge arm is more than 50%, correspondence series-resonant inverting circuit equivalent voltage transmission gain M>0.5.
As illustrated with reference to fig. 2, in the positive half period of a switch periods, the first drive signal S1Drive first switch device Q1Carry out PWM, fourth drive signal S4Drive the 4th switching device Q4To set duty cycle：
Within a period of time of positive half period：Drive signal driving switch device Q1、Q4Simultaneously turn on, switching device Q2、Q3 It is off, input voltage Vin, switching device Q1, resonator, switching device Q4It is composed in series loop, the electricity that A, B at 2 points Press VABFor high level (identical with the direction for setting voltage), the inverter current exported by inverter circuit 51 or the electricity for flowing through resonator Flow iLsGradually increase (sense of current in resonator is identical with scheduled current direction)；
Afterwards, only Q4Conducting, Q1、Q2、Q3It is off simultaneously, resonator, switching device Q4, the second diode D2String Joint group is into loop, 2 points of A, B voltage VABFor zero level, and resonator series inductance is discharged, and flows through the electric current i of resonatorLsBy It is decrescence small, it is in the process Q in the presence of a turn-off power loss in circuit until being decreased to zero1Hard shut-off in high current；
Afterwards, only Q4Conducting, Q1、Q2、Q3It is off simultaneously, Q1、Q2、Q3、Q4It is off simultaneously, resonance Electric capacity Cs both end voltages are zero in chamber, 2 points of A, B voltage VABFor zero level, now there is not resonator to flow through electric current, Q4Shut-off When turn-off power loss be zero, in the absence of the hard shut-off of switching device.
In the negative half-cycle of a switch periods, the second drive signal drives second switch device to set dutycycle work Make, the 3rd drive signal drives the 3rd switching device to set duty cycle：
Within a period of time of negative half-cycle, drive signal driving switch device Q2、Q3Simultaneously turn on, switching device Q1、Q4 It is off, input voltage Vin, switching device Q3, resonator, switching device Q2It is composed in series loop, the electricity that A, B at 2 points Press VABFor high level (but with defined in opposite direction), resonator is operated in free-run mode.In this embodiment, freely shake Swing pattern refer to the inverter current exported by inverter or flow through resonator electric current first gradually increase to peak (in resonator The sense of current and scheduled current it is in opposite direction), the inverter current that is then exported by inverter or flow through the electric current of resonator again It is gradually reduced by peak value.
Afterwards, when the inverter current that inverter is exported or when flowing through the electric current of resonator and being decreased to zero, switching device Q2、Q3 It is off (within the lower half cycle, in the absence of the hard shut-off of switching device), Simultaneous Switching device Q simultaneously1And Q4Beat simultaneously Open, the modulation of inverter circuit enters next cycle.In this embodiment, the working condition of each switching device of next cycle with Foregoing description is consistent.
It should be noted that when the negative half period series resonant circuit of same switch periods is operated in oneself under input source forcing By mode of resonance, to ensure that being in zero moment in cavity current carries out switch motion, should meet switching frequency fsEqual to series connection Resonant frequency fr, now switching loss is also smaller.In addition, in whole switch periods, only exist a switching device and turn off firmly, Effectively reduce IGBT switching loss.
Embodiment 2
According to the present embodiment, drive signal, which is used for driving switch device, be periodically turned on or off, and switching device Periodically be turned on or off and at least include a switch periods, only one switching device has one in the switch periods Hard shut-off.In the positive half period of a switch periods, a switching device of the driving left side bridge arm of drive circuit 14 carries out PWM tune System, drives two switching devices of the right bridge arm to set duty cycle；In the negative half-cycle of a switch periods, driving electricity The driving switch device of road 14, makes series resonant converter be operated in free-run mode.
In inverter circuit equivalent voltage transmission gain M<When 0.5, the first switch device Q of left side bridge arm can control1Always State is off, the second switch device Q of left side bridge arm is controlled2PWM mode is operated in, and a switch periods are only negative Half cycle carries out a PWM action；3rd switching device Q of control the right bridge arm3With the 4th switching device Q4Still all 50% duty Than complementary duty, only retain certain dead band to avoid leading directly to.Fig. 3 is the tune of the series resonant inverter of the embodiment of the present application 2 Oscillogram processed, wherein：Transverse axis represents the time (unit is s)；The longitudinal axis is expressed as drive signal S from top to bottom1、S2、S3And S4Electricity Corrugating, the voltage difference V between A and BAB, flow through the electric current i of resonatorLs, the corresponding circuit of series resonant inverter can correspond to Accompanying drawing 1.It should be noted that in this embodiment, the dutycycle of left side bridge arm is less than 50% in inverter circuit, and correspondence series connection is humorous Inverter circuit equivalent voltage transmission gain of shaking M<0.5.
As shown in figure 3, the first drive signal S1Drive first switch device Q1It is off, and a switch week The positive half period of phase, fourth drive signal S4Drive the 4th switching device Q4To set duty cycle, set in this embodiment Dutycycle is 50%：
In positive half period initial time, fourth drive signal S4Drive the 4th switching device Q4Conducting, switching device Q2、Q3 Disconnect, and switching device Q1 is constantly in cut-off state.Q2、Q3The inductance element included in moment, resonator is disconnected in circuit Current break can produce larger induced electromotive force, therefore can produce voltage at A, B two ends in positive half period initial time Mutation, 2 points of A, B voltage VABFor high level.Now, resonator, D1、VinAnd Q4Series loop can be constituted；At the same time, it is humorous The electromotive force that intracavitary of shaking inductance element is produced can be offset by Vin so that the electric current i of resonatorLsIt is reduced to zero rapidly.With latter section In time, series resonant converter is operated in free-run mode, the electric current i of resonatorLsSinusoidal waveform changes.Need explanation It is in positive half period, to only exist Q2In the hard shut-off of high current.
In negative half-cycle initial time, S4Drive Q4Disconnect, S3Drive Q3Conducting.Now, there is part electricity in resonator Flow, the inductance element included in resonator the induced electromotive force larger because the current break in circuit can be produced (is prevented positive The reduction of electric current), 2 points of A, B voltage VABBe similarly high level, but with it is defined in opposite direction.Now, resonator, D1、Vin And D4Series loop can be constituted；At the same time, the electromotive force that inductance element is produced in resonator can connect with Vin so that resonance The electric current i of chamberLsSlowly it is reduced to zero.Then in a period of time, only Q3Conducting, the electric current i of resonatorLsRemain nought state.
Within follow-up a period of time of negative half-cycle, S3Continue to drive Q3Tend to remain on, S2Drive Q2Conducting, Q4And Q1 Continue to remain off, now Vin、Q3, resonator, Q2Constitute the voltage V of series loop, now 2 points of A, BABIt is similarly high Level, but with it is defined in opposite direction.Series resonant converter is operated in serial oscillation pattern, the electric current i of resonatorLsSine wave Deformation.In this embodiment, the working condition of each switching device of next cycle is consistent with foregoing description.
In the present embodiment, the Q of left side bridge arm1It is constantly in off state, Q2Then it is operated in PWM mode, and a switch Cycle only carries out a PWM action in negative half period；Two switching devices of the right bridge arm are still all worked with 50% complementary duty cycle, Only retain certain dead band to avoid leading directly to.So, it is operated in freedom in the positive half cycle series resonant circuit of same switch periods Mode of resonance, negative half period is then operated in the series resonance mode under input source forcing, by the switching frequency f for making switching devices Slightly larger than the series resonance frequency f of series-resonant inverting circuitr, it is ensured that less switching loss.
Embodiment 3
In this embodiment, drive signal carries out periodically being turned on or off for driving switch device, and switching device Periodically be turned on or off and at least include a switch periods, only one switching device has one in this switch periods Hard shut-off.In the positive half period of a switch periods, two switching devices of the driving left side bridge arm of drive circuit 14 are accounted for setting Sky carries out PWM than work, a switching device of driving the right bridge arm；In the negative half-cycle of a switch periods, driving The driving switch device of circuit 14, makes series resonant converter be operated in free-run mode.It should be noted that in this application " positive half period " is also referred to as " first half cycle ", and " negative half-cycle " is also referred to as " later half cycle ".
In inverter circuit equivalent voltage transmission gain M>When 0.5, the 4th switching device Q of the right bridge arm can control4Work In PWM mode, and a switch periods only carry out a PWM action, the 3rd derailing switch of control the right bridge arm in positive half cycle Part Q3Worked in the negative half period of a switch periods with 50% fixed duty cycle；Belong to the first switch device Q of left side bridge arm1、 Second switch device Q2All worked with 50% complementary duty cycle, only retain certain dead band to avoid leading directly to.Fig. 4 is that the application is real The modulation waveform figure of the series resonant inverter of example 3 is applied, the corresponding circuit of series resonant inverter can respective figure 1.Need Bright, in this embodiment, the dutycycle of the right bridge arm is more than 50%, correspondence series-resonant inverting circuit etc. in inverter circuit Imitate voltage transmission gain M>0.5.
As shown in reference to Fig. 4, in the positive half period of a switch periods, the first drive signal S1Drive first switch device Q1To set duty cycle, dutycycle is set in this embodiment and selects 50% dutycycle, fourth drive signal S4Drive the 4th Switching device Q4Carry out PWM：
Within a period of time of positive half period：Drive signal driving switch device Q1、Q4Simultaneously turn on, switching device Q2、Q3 It is off, input voltage Vin, switching device Q1, resonator, switching device Q4It is composed in series loop, the electricity that A, B at 2 points Press VABFor high level (identical with the direction for setting voltage), the inverter current exported by inverter circuit or the electric current for flowing through resonator iLsGradually increase (sense of current in resonator is identical with scheduled current direction)；
Afterwards, only Q1Conducting, Q2、Q3And Q4It is off simultaneously, resonator, switching device Q1, the 3rd diode D3 It is composed in series loop, 2 points of A, B voltage VABFor zero level, and resonator series inductance is discharged, and flows through the electric current i of resonatorLs It is gradually reduced, until being decreased to zero, there is a turn-off power loss, i.e. hard passes of the Q4 in high current in circuit in the process It is disconnected；
Afterwards, Q1Continue to be held on, Q1、Q2、Q3Keep being off simultaneously, work as Q1、Q2、Q3、Q4Simultaneously in disconnected Electric capacity Cs both end voltages are zero in open state, resonator, 2 points of A, B voltage VABFor zero level, now there is not resonator to flow through Electric current, Q1Turn-off power loss during shut-off is zero, in the absence of the hard shut-off of switching device.
In the negative half-cycle of a switch periods, the second drive signal S2Drive second switch device Q2To set dutycycle Work, the 3rd drive signal S3Drive the 3rd switching device Q3To set duty cycle：
Within a period of time of negative half-cycle, drive signal driving switch device Q2、Q3Simultaneously turn on, switching device Q1、Q4 It is off, input voltage Vin, switching device Q3, resonator, switching device Q2It is composed in series loop, the electricity that A, B at 2 points Press VABFor high level (but with defined in opposite direction), resonator is operated in free-run mode.In this embodiment, freely shake Swing pattern refer to the inverter current exported by inverter or flow through resonator electric current first gradually increase to peak (in resonator The sense of current and scheduled current it is in opposite direction), the inverter current that is then exported by inverter or flow through the electric current of resonator again It is gradually reduced by peak value.
Afterwards, when the inverter current that inverter is exported or when flowing through the electric current of resonator and being decreased to zero, switching device Q2、Q3 It is off (within the lower half cycle, in the absence of the hard shut-off of switching device), Simultaneous Switching device Q simultaneously1And Q4Beat simultaneously Open, the modulation of inverter circuit enters next cycle.In this embodiment, the working condition of each switching device of next cycle with Foregoing description is consistent.
It should be noted that when the negative half period series resonant circuit of same switch periods is operated in oneself under input source forcing By mode of resonance, to ensure that being in zero moment in cavity current carries out switch motion, should meet switching frequency fsEqual to series connection Resonant frequency fr, now switching loss is also smaller.In addition, in whole switch periods, only exist a switching device and turn off firmly, Effectively reduce IGBT switching loss.
Embodiment 4
According to the present embodiment, drive signal, which is used for driving switch device, be periodically turned on or off, and switching device Periodically be turned on or off and at least include a switch periods, only one switching device has one in this switch periods Hard shut-off.In the positive half period of a switch periods, two switching devices of the driving left side bridge arm of drive circuit 14 are accounted for setting Sky carries out PWM than work, a switching device of driving the right bridge arm；In the negative half-cycle of a switch periods, driving The driving switch device of circuit 14, makes series resonant converter be operated in free-run mode.It should be noted that in this application " positive half period " is also referred to as " first half cycle ", and " negative half-cycle " is also referred to as " later half cycle ".
In inverter circuit equivalent voltage transmission gain M<When 0.5, the 4th switching device Q of the right bridge arm can control4Always It is off state, the 3rd switching device Q of control the right bridge arm3PWM mode is operated in, and a switch periods are only negative Half cycle carries out a PWM action；Control the first switch device Q of left side bridge arm1With second switch device Q2Still all 50% duty Than complementary duty, only retain certain dead band to avoid leading directly to.Fig. 5 is the tune of the series resonant inverter of the embodiment of the present application 4 Oscillogram processed, wherein：Transverse axis represents the time (unit is s)；The longitudinal axis is expressed as drive signal S from top to bottom1、S2、S3And S4Electricity Corrugating, the voltage difference V between A and BAB, flow through the electric current i of resonatorLs, the corresponding circuit of series resonant inverter can correspond to Accompanying drawing 1.It should be noted that in this embodiment, the dutycycle of the right bridge arm is less than 50% in inverter circuit, and correspondence series connection is humorous Inverter circuit equivalent voltage transmission gain of shaking M<0.5.
As shown in figure 5, fourth drive signal S4Drive the 4th switching device Q4It is off, and a switch week The positive half period of phase, the first drive signal S1Drive the 4th switching device Q1To set duty cycle, set in this embodiment Dutycycle is 50%：
In positive half period initial time, the first drive signal S1Drive first switch device Q1Conducting, switching device Q2、Q3 Disconnect, and switching device Q4It is constantly in cut-off state.Q2、Q3The inductance element included in moment, resonator is disconnected in circuit Current break can produce larger induced electromotive force, therefore can produce voltage at A, B two ends in positive half period initial time Mutation, 2 points of A, B voltage VABFor high level.Now, resonator, Q1、VinAnd D4Series loop can be constituted；At the same time, it is humorous The electromotive force that intracavitary of shaking inductance element is produced can be by VinOffset so that the electric current i of resonatorLsIt is reduced to zero rapidly.With latter section In time, series resonant converter is operated in free-run mode, the electric current i of resonatorLsSinusoidal waveform changes.
In negative half-cycle initial time, S1Drive Q1Disconnect, S2Drive Q2Conducting.Now, there is part electricity in resonator Flow, the inductance element included in resonator the induced electromotive force larger because the current break in circuit can be produced (is prevented positive The reduction of electric current), 2 points of A, B voltage VABBe similarly high level, but with it is defined in opposite direction.Now, resonator, D1、Vin And D4Series loop can be constituted；At the same time, the electromotive force that inductance element is produced in resonator can connect with Vin so that resonance The electric current i of chamberLsSlowly it is reduced to zero.Then in a period of time, only Q2Conducting, the electric current i of resonatorLsRemain nought state.
Within follow-up a period of time of negative half-cycle, S2Continue to drive Q2Tend to remain on, S3Drive Q3Conducting, Q4And Q1 Continue to remain off, now Vin、Q3, resonator, Q2Constitute the voltage V of series loop, now 2 points of A, BABIt is similarly high Level, but with it is defined in opposite direction.Series resonant converter is operated in serial oscillation pattern, the electric current i of resonatorLsSine wave Deformation.In this embodiment, the working condition of each switching device of next cycle is consistent with foregoing description.
In the present embodiment, the Q of the right bridge arm4It is constantly in off state, Q3Then it is operated in PWM mode, and a switch Cycle only carries out a PWM action in negative half period；Two switching devices of left side bridge arm are still all worked with 50% complementary duty cycle, Only retain certain dead band to avoid leading directly to.So, it is operated in freedom in the positive half cycle series resonant circuit of same switch periods Mode of resonance, negative half period is then operated in the series resonance mode under input source forcing, by the switching frequency f for making switching devices Slightly larger than the series resonance frequency f of series-resonant inverting circuitr, only there is Q in positive half period3, can in the hard shut-off of high current To ensure less switching loss.
Embodiment 5
In this embodiment, drive signal carries out periodically being turned on or off for driving switch device, and switching device Periodically be turned on or off at least includes only existing switching device in two switch periods, and each switch periods Hard shut-off.Drive circuit 14 can provide drive signal driving inverter circuit 11 and carry out periodic modulation, series-resonant inverting circuit Equivalent voltage transmission gain M>0.5, the periodic modulation may include first switch cycle and second switch cycle, wherein；
In the positive half period in first switch cycle, a switching device of the driving left side bridge arm of drive circuit 14 carries out PWM Modulation, drives two switching devices of the right bridge arm to set duty cycle；In the negative half-cycle in first switch cycle, driving The driving switch device of circuit 14/inverter circuit 11, makes series resonant converter be operated in free-run mode.
In the positive half period in second switch cycle, two switching devices of the driving left side bridge arm of drive circuit 14 are accounted for setting Sky carries out PWM than work, a switching device of driving the right bridge arm；In the negative half-cycle in second switch cycle, driving The driving switch device of circuit 14, makes series resonant converter be operated in free-run mode.
In this embodiment, as shown in figure 1, the left side bridge arm of inverter circuit 11 includes first switch device Q1Opened with second Close device Q2, the right bridge arm include the 3rd switching device Q3With the 4th switching device Q4, and the first drive signal S is provided1To first Switching device Q1There is provided the second drive signal S2Give second switch device Q2There is provided the 3rd drive signal S3To the 3rd switching device Q3There is provided fourth drive signal S4To the 4th switching device Q4, the derailing switch in above-mentioned multiple drive signals driving inverter circuits 11 Part be periodically turned on or off.Fig. 6 is the modulation waveform figure of the series resonant inverter of the embodiment of the present application 5, is driven Journey is as follows：
In the positive half period in first switch cycle, the first drive signal S1Drive first switch device Q1Carry out PWM, Fourth drive signal S4Drive the 4th switching device Q4To set duty cycle.The working condition of each electronic component is：Just half In a period of time in cycle, drive signal driving switch device Q1、Q4Simultaneously turn on, switching device Q2、Q3It is off, Input voltage Vin, switching device Q1, resonator, switching device Q4It is composed in series loop, 2 points of A, B voltage VABFor high level (identical with the direction for setting voltage), the inverter current exported by inverter circuit or the electric current i for flowing through resonatorLsGradually increase (sense of current in resonator is identical with scheduled current direction)；Afterwards, only Q4Conducting, Q1、Q2、Q3It is off simultaneously, Resonator, switching device Q4, the second diode D2It is composed in series loop, 2 points of A, B voltage VABFor zero level, and resonator string Join inductive discharge, flow through the electric current i of resonatorLsIt is gradually reduced, until being decreased to zero, exists in circuit once close in the process Breakdown consumes, i.e. Q1Hard shut-off in high current；
Afterwards, Q4/ cut-off state, Q are gone off by conducting1、Q2、Q3、Q4It is off simultaneously, electric capacity in resonator Cs both end voltages are zero, 2 points of A, B voltage VABFor zero level, now there is not resonator to flow through electric current, Q4Shut-off during shut-off Loss is zero, in the absence of the hard shut-off of switching device.
In the negative half-cycle in first switch cycle, the second drive signal drives second switch device to set dutycycle work Make, the 3rd drive signal drives the 3rd switching device to set duty cycle.The working condition of each electronic component is：Negative half In a period of time in cycle, drive signal driving switch device Q2、Q3Simultaneously turn on, switching device Q1、Q4It is off, Input voltage Vin, switching device Q3, resonator, switching device Q2It is composed in series loop, 2 points of A, B voltage VA,BFor high level (but with defined in opposite direction), resonator be operated under free-run mode, free-run mode by inverter export it is inverse Time-dependent current flows through the electric current of resonator and first gradually increases to peak (sense of current in resonator and scheduled current direction Conversely), the inverter current that is then exported by inverter flows through the electric current of resonator and is gradually reduced again by peak value；Afterwards, when inverse When the inverter current for becoming device output or the electric current for flowing through resonator are decreased to zero, switching device Q2、Q3It is off simultaneously, In the absence of the hard shut-off of switching device.
In the positive half period in second switch cycle, the first drive signal drives first switch device to set dutycycle work Make, fourth drive signal drives the 4th switching device to carry out PWM.The working condition of each electronic component is：In positive half period A period of time in, drive signal driving switch device Q1、Q4Simultaneously turn on, switching device Q2、Q3It is off, inputs Voltage Vin, switching device Q1, resonator, switching device Q4It is composed in series loop, 2 points of A, B voltage VABFor high level, by inverse Become the inverter current of the output of circuit 51 or flow through the electric current i of resonatorLsGradually increase；Afterwards, only Q1Conducting, Q2、Q3And Q4Simultaneously It is off, resonator, switching device Q1, the 3rd diode D3It is composed in series loop, 2 points of A, B voltage VABIt is zero electricity It is flat, and the electric discharge of resonator series inductance, flow through the electric current i of resonatorLsIt is gradually reduced, until it is decreased to zero, it is electric in the process There is a turn-off power loss, i.e. Q in road4Hard shut-off in high current；
Afterwards, Q is worked as1Off-state, Q are converted into by conducting state1、Q2、Q3、Q4It is off simultaneously, in resonator Electric capacity Cs both end voltages are zero, 2 points of A, B voltage VABFor zero level, now there is not resonator to flow through electric current, Q1During shut-off Turn-off power loss is zero, in the absence of the hard shut-off of switching device.
In the negative half-cycle in second switch cycle, the second drive signal S2Drive second switch device Q2To set dutycycle Work, the 3rd drive signal S3Drive the 3rd switching device Q3To set duty cycle.The working condition of each electronic component is： Within a period of time of negative half-cycle, drive signal driving switch device Q2、Q3Simultaneously turn on, switching device Q1、Q4In disconnection State, input voltage Vin, switching device Q3, resonator, switching device Q2It is composed in series loop, 2 points of A, B voltage VABFor height Level, resonator is operated in the inverter current exported under free-run mode, free-run mode by inverter or flows through resonance The electric current of chamber first gradually increases to peak, the inverter current that is then exported by inverter or flow through the electric current of resonator again by Peak value is gradually reduced；Afterwards, when the inverter current that inverter is exported or when flowing through the electric current of resonator and being decreased to zero, switching device Q2、Q3It is off simultaneously.
Certainly, the periodic modulation of drive signal driving inverter circuit may also include the 3rd switch periods, the 5th switch week Phase ..., multiple odd-numbered switch cycles such as (2n-1) switch periods, and the 4th switch periods, the 6th switch periods ..., In multiple even-numbered switch cycles such as (2n) switch periods, n is positive integer.In one embodiment, within all odd-numbered switch cycles, The action of each electronic component is identical with the first switch sampling action of embodiment 5；Within all even-numbered switch cycles, each electronics member The action of part is identical with the first switch cycle of embodiment 5 or second switch sampling action.In another embodiment, all In the odd-numbered switch cycle, the action of each electronic component and the first switch sampling action of the present embodiment or second switch sampling action It is identical；Within all even-numbered switch cycles, the action of each electronic component is identical with the second switch sampling action of the present embodiment.Need It is noted that in the present embodiment, turn-off power loss is evenly distributed in the bridge arm of left and right two, for being used as switch using half-bridge module The occasion of device, can be substantially reduced the temperature rise of switching device.
Embodiment 6
In this embodiment, drive circuit 14 can provide drive signal driving inverter circuit 11 and carry out periodic modulation, string Join resonance inversion circuit equivalent voltage transmission gain M<0.5, the periodic modulation may include first switch cycle and second switch Cycle, and first switch cycle and second switch cycle be respectively present the hard shut-off of a switching device, the first drive signal S1 Driving first switch device is off, and：
In the positive half period in first switch cycle, fourth drive signal S4Drive the 4th switching device Q4To set dutycycle Work；In the negative half-cycle in first switch cycle, the second drive signal S2Drive second switch device Q2Carry out PWM, the 3rd Drive signal S3Drive the 3rd switching device Q3To set duty cycle.
In the positive half period in second switch cycle, fourth drive signal S4Drive the 4th switching device Q4To set dutycycle Work；In the negative half-cycle in second switch cycle, the second drive signal S2Drive second switch device Q2To set dutycycle work Make, the 3rd drive signal S3 drives the 3rd switching device Q3 to carry out PWM.
It should be noted that during above-mentioned periodic modulation, the modulation of period 1 only has switching device Q3Compared with There is turn-off power loss at high current；The modulation of second round only has switching device Q2There is turn-off power loss at high current.When So, the periodic modulation of drive signal driving inverter circuit may also include other modulation periods, and other modulation periods with it is above-mentioned First or second round it is identical, turn-off power loss is evenly distributed in the bridge arm of left and right two, for being used as derailing switch using half-bridge module The occasion of part, can be substantially reduced the temperature rise of switching device.
Although the application is described with reference to current specific embodiment, those of ordinary skill in the art It should be appreciated that the embodiment of the above is intended merely to illustrate the application, it can also make in the case of without departing from the application spirit Go out various equivalent change or replacement, therefore, as long as change, change in the spirit of the application to above-described embodiment Type will all fall in the range of following claims.

Claims (10)

1. a kind of control circuit of series resonant converter, the series resonant converter includes inverter circuit, the inversion electricity Road includes left side bridge arm and the right bridge arm, and the left side bridge arm and the right bridge arm are described respectively comprising two switching devices Control circuit includes：
Drive circuit, provides drive signal, the drive signal is used for the switch for the switching device of the inverter circuit Device carries out periodic modulation, and the periodic modulation at least includes a switch periods, and in one switch periods There is once hard shut-off in the switching device of the inverter circuit, wherein,
In the positive half period of a switch periods, the drive circuit drives a switching device of the left side bridge arm to carry out PWM, drives two switching devices of the right bridge arm to set duty cycle；
In the negative half-cycle of a switch periods, the drive circuit drives the derailing switch of the left side bridge arm and the right bridge arm Part, makes the series resonant converter be operated in free-run mode.
2. the control circuit of series resonant converter according to claim 1, it is characterised in that the left side bridge arm includes First switch device and second switch device, the right bridge arm include the 3rd switching device and the 4th switching device, the drive Dynamic circuit provide the first drive signal to the first switch device there is provided the second drive signal to the second switch device, There is provided the 3rd drive signal to the 3rd switching device there is provided fourth drive signal to the 4th switching device, it is and described The equivalent voltage transmission gain of inverter circuit is more than 0.5：
In the positive half period of a switch periods, first drive signal drives the first switch device to carry out PWM, The fourth drive signal drives the 4th switching device to set duty cycle；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to set dutycycle Work, the 3rd drive signal drives the 3rd switching device to set duty cycle.
3. the control circuit of series resonant converter according to claim 1, it is characterised in that the left side bridge arm includes First switch device and second switch device, the right bridge arm include the 3rd switching device and the 4th switching device, the drive Dynamic circuit provide the first drive signal to the first switch device there is provided the second drive signal to the second switch device, There is provided the 3rd drive signal to the 3rd switching device there is provided fourth drive signal to the 4th switching device, it is and described The equivalent voltage transmission gain of inverter circuit is less than 0.5：It is disconnected that first drive signal drives the first switch device to be in Open state；
In the positive half period of a switch periods, the fourth drive signal drives the 4th switching device to set dutycycle Work；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to carry out PWM, 3rd drive signal drives the 3rd switching device to set duty cycle.
4. a kind of control circuit of series resonant converter, the series resonant converter includes inverter circuit, the inversion electricity Road includes left side bridge arm and the right bridge arm, and the left side bridge arm and the right bridge arm are described respectively comprising two switching devices Control circuit includes：
Drive circuit, provides drive signal, the drive signal is used for the switch for the switching device of the inverter circuit Device carries out periodic modulation, and the periodic modulation at least includes a switch periods, and in one switch periods There is once hard shut-off in the switching device of the inverter circuit, wherein,
In the positive half period of a switch periods, the drive circuit drives two switching devices of the left side bridge arm to set Duty cycle, drives a switching device of the right bridge arm to carry out PWM；
In the negative half-cycle of a switch periods, the drive circuit drives the derailing switch of the left side bridge arm and the right bridge arm Part, makes the series resonant converter be operated in free-run mode.
5. the control circuit of series resonant converter according to claim 4, it is characterised in that the left side bridge arm includes First switch device and second switch device, the right bridge arm include the 3rd switching device and the 4th switching device, the drive Dynamic circuit provide the first drive signal to the first switch device there is provided the second drive signal to the second switch device, There is provided the 3rd drive signal to the 3rd switching device there is provided fourth drive signal to the 4th switching device, it is and described The equivalent voltage transmission gain of inverter circuit is more than 0.5：
In the positive half period of a switch periods, first drive signal drives the first switch device to set dutycycle Work, the fourth drive signal drives the 4th switching device to carry out PWM；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to set dutycycle Work, the 3rd drive signal drives the 3rd switching device to set duty cycle.
6. the control circuit of series resonant converter according to claim 4, it is characterised in that the left side bridge arm includes First switch device and second switch device, the right bridge arm include the 3rd switching device and the 4th switching device, the drive Dynamic circuit provide the first drive signal to the first switch device there is provided the second drive signal to the second switch device, There is provided the 3rd drive signal to the 3rd switching device there is provided fourth drive signal to the 4th switching device, it is and described The equivalent voltage transmission gain of inverter circuit is less than 0.5：It is disconnected that the fourth drive signal drives the 4th switching device to be in Open state；
In the positive half period of a switch periods, first drive signal drives the first switch device to set dutycycle Work；
In the negative half-cycle of a switch periods, second drive signal drives the second switch device to set dutycycle Work, the 3rd drive signal drives the 3rd switching device to carry out PWM.
7. a kind of control method of series resonant converter, the series resonant converter includes inverter circuit, the inversion electricity Road includes left side bridge arm and the right bridge arm, and the left side bridge arm and the right bridge arm are respectively comprising two switching devices, the control Method includes：
Drive signal is provided for the switching device of the inverter circuit, the drive signal driving switch device periodically lead On-off is opened, and the periodic modulation at least includes first switch cycle and second switch cycle, wherein, in the first switch cycle Positive half period, the drive circuit drives a switching device of the left side bridge arm to carry out PWM, drives described the right Two switching devices of bridge arm are to set duty cycle；
In the negative half-cycle in first switch cycle, the drive circuit drives the derailing switch of the left side bridge arm and the right bridge arm Part, makes the series resonant converter be operated in free-run mode；
In the positive half period in second switch cycle, the drive circuit drives two switching devices of the left side bridge arm to set Duty cycle, drives a switching device of the right bridge arm to carry out PWM；
In the negative half-cycle in second switch cycle, the drive circuit driving switch device makes the series resonant converter work Make in free-run mode.
8. the control method of series resonant converter according to claim 7, it is characterised in that the left side bridge arm includes First switch device and second switch device, the right bridge arm include the 3rd switching device and the 4th switching device, and provide There is provided the second drive signal, to the second switch device, there is provided the 3rd drive to the first switch device for first drive signal Dynamic signal gives the 4th switching device to the 3rd switching device there is provided fourth drive signal, wherein,
In the positive half period in first switch cycle, first drive signal drives the first switch device to carry out PWM, The fourth drive signal drives the 4th switching device to set duty cycle；
In the negative half-cycle in first switch cycle, second drive signal drives the second switch device to set dutycycle Work, the 3rd drive signal drives the 3rd switching device to set duty cycle；
In the positive half period in second switch cycle, first drive signal drives the first switch device to set dutycycle Work, the fourth drive signal drives the 4th switching device to carry out PWM；
In the negative half-cycle in second switch cycle, second drive signal drives the second switch device to set dutycycle Work, the 3rd drive signal drives the 3rd switching device to set duty cycle.
9. the control method of series resonant converter according to claim 7, it is characterised in that the left side bridge arm includes First switch device and second switch device, the right bridge arm include the 3rd switching device and the 4th switching device, and provide There is provided the second drive signal, to the second switch device, there is provided the 3rd drive to the first switch device for first drive signal Dynamic signal gives the 4th switching device to the 3rd switching device there is provided fourth drive signal, wherein：First driving Signal drives the first switch device to be off；
In the positive half period in first switch cycle, the fourth drive signal drives the 4th switching device to set dutycycle Work；
In the negative half-cycle in first switch cycle, second drive signal drives the second switch device to carry out PWM, 3rd drive signal drives the 3rd switching device to set duty cycle；
In the positive half period in second switch cycle, the fourth drive signal drives the 4th switching device to set dutycycle Work；
In the negative half-cycle in second switch cycle, second drive signal drives the second switch device to set dutycycle Work, the 3rd drive signal drives the 3rd switching device to carry out PWM.
10. the control method of the series resonant converter according to claim any one of 7-9, it is characterised in that described to set It is 50% to determine dutycycle.
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108229038A (en) * 2018-01-10 2018-06-29 西北核技术研究所 The model building method and turn on process analogy method of three electrode field distortion gas switch
CN112821769A (en) * 2020-12-31 2021-05-18 深圳市科华恒盛科技有限公司 Control method of resonant circuit and terminal equipment
CN112994503A (en) * 2021-04-30 2021-06-18 石家庄通合电子科技股份有限公司 SPWM (sinusoidal pulse Width modulation) method and terminal equipment of single-phase full-bridge inverter

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399498A (en) * 2007-09-26 2009-04-01 华为技术有限公司 DC conversion power source device and method for improving DC conversion power source device
CN103441692A (en) * 2013-07-30 2013-12-11 东软飞利浦医疗设备系统有限责任公司 Series resonance inverter and implementation method thereof
JP5732431B2 (en) * 2012-05-21 2015-06-10 オリジン電気株式会社 Series resonant converter system
CN106358354A (en) * 2016-11-15 2017-01-25 上海联影医疗科技有限公司 X-ray high-voltage generator, control circuit of resonant converter and control method
CN106455278A (en) * 2016-11-15 2017-02-22 上海联影医疗科技有限公司 X-ray high-voltage generator and circuit and method for controlling series resonant converter
JP2017055496A (en) * 2015-09-07 2017-03-16 東洋電機製造株式会社 Method and apparatus for controlling series resonance type power supply device

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101399498A (en) * 2007-09-26 2009-04-01 华为技术有限公司 DC conversion power source device and method for improving DC conversion power source device
JP5732431B2 (en) * 2012-05-21 2015-06-10 オリジン電気株式会社 Series resonant converter system
CN103441692A (en) * 2013-07-30 2013-12-11 东软飞利浦医疗设备系统有限责任公司 Series resonance inverter and implementation method thereof
JP2017055496A (en) * 2015-09-07 2017-03-16 東洋電機製造株式会社 Method and apparatus for controlling series resonance type power supply device
CN106358354A (en) * 2016-11-15 2017-01-25 上海联影医疗科技有限公司 X-ray high-voltage generator, control circuit of resonant converter and control method
CN106455278A (en) * 2016-11-15 2017-02-22 上海联影医疗科技有限公司 X-ray high-voltage generator and circuit and method for controlling series resonant converter

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108229038A (en) * 2018-01-10 2018-06-29 西北核技术研究所 The model building method and turn on process analogy method of three electrode field distortion gas switch
CN112821769A (en) * 2020-12-31 2021-05-18 深圳市科华恒盛科技有限公司 Control method of resonant circuit and terminal equipment
CN112994503A (en) * 2021-04-30 2021-06-18 石家庄通合电子科技股份有限公司 SPWM (sinusoidal pulse Width modulation) method and terminal equipment of single-phase full-bridge inverter

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