CN102969928B - Output power adjustment method for resonance type converter - Google Patents

Output power adjustment method for resonance type converter Download PDF

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CN102969928B
CN102969928B CN201210414333.XA CN201210414333A CN102969928B CN 102969928 B CN102969928 B CN 102969928B CN 201210414333 A CN201210414333 A CN 201210414333A CN 102969928 B CN102969928 B CN 102969928B
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resonance
type inverters
subharmonic
frequency
output
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CN102969928A (en
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史黎明
蔡华
李耀华
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Institute of Electrical Engineering of CAS
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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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Abstract

Provided is an output power adjustment method for a resonance type converter. The method comprises selecting the maximum k value meeting the requirements when a fundamental wave effective value of voltage output by the converter is smaller than or equal to the maximum value of k harmonic effective values according to the requirements of output power of the resonance type converter, enabling switching frequency to be reduced to 1/k of resonance frequency, enabling k harmonics to work in a resonance state, controlling the duty ratio of the output voltage to adjust effective values of the k harmonics and adjust the output power, utilizing harmonic components of the voltage output by the converter to transmit power, and enabling k to be a positive odd number. A hardware circuit does not need changing, the adjustment method has a wide power adjustment range in comparison with an ordinary resonance type converter, switching loss is small, and electromagnetic interference is low.

Description

The power output control method of resonant current transformer
Technical field
The present invention relates to a kind of control method of resonant current transformer power output.
Background technology
Resonance-type inverters is the core component of resonant current transformer.Resonance-type inverters relies on inductance and capacitor resonance to make switching device easily be operated in soft Switching Condition, wherein full-bridge phase-shifting resonance type inverter is widely applied in high-power field, by introduce resonant inductance, resonant capacitance and Dead Time in phase-shifted full-bridge converter, make switching device realize no-voltage open-minded, in the time that load is heavier, there is good regulating effect.But needing under the underload operating mode that power output is less, because phase shifting angle is very large, more difficult to realize no-voltage open-minded, and switching loss is larger, causes resonance-type inverters to be greatly affected in load variations wide ranges and the larger occasion performance of mains fluctuations scope.
Patent 201110078847.8 has been announced a kind of method and device that reduces switching loss of phase-shifting full-bridge converter, by the optimum dead zone time is provided, switching loss is reduced to minimum, expands soft switching frequency scope, but loss in the time of underloading is still larger.
Patent 200610061264.3 has been announced a kind of control method of phase whole-bridging circuit, makes circuit be regulated the switching frequency of inverter or be made drive circuit discontinuous operation, the switching loss while reducing underloading by drive circuit under different loads.Although reduced loss, how not point out regulating frequency, simultaneously due to circuit discontinuous operation, load voltage ripple is very large.
The problem that existing phase-shifting resonance inverter control method exists is: (1), in the time of underloading, phase shifting angle is very large, is difficult to realize soft switch, and switching loss is high; (2), in the time of underloading, if make drive circuit interval work, can make load voltage ripple strengthen; (3) when underloading, in inverter output voltage, harmonic content is greater than first-harmonic content, and in resonance current, harmonic content is large.
Summary of the invention
The object of the invention is to solve the existing harmonic high frequency vibration shape inverter problem that loss is high in the time of underloading, load voltage ripple is large, harmonic content is many, a kind of pulse duration modulation method that adopts harmonic wave phase shift is proposed, in the time of underloading, reduce the fundamental frequency of inverter output voltage, harmonic components in control inverter output voltage is operated in resonance condition and carrys out transmitted power, by controlling harmonic wave effective value regulation output power.The present invention is specially adapted to the high-frequency resonant inverter circuit in wireless power transmission field.
Typical resonance type inverter output voltage frequency is identical with inverter switching frequency, has abundant harmonic wave in inverter output voltage, and along with the reducing of inverter output voltage pulsewidth and frequency, the proportion that harmonic content accounts for enlarges markedly.
The technical scheme that technical solution problem of the present invention adopts is as follows:
The present invention does not change existing main circuit topological structure, adopts a kind of power regulating method, according to the size of power output, makes different harmonic waves in resonance-type inverters output voltage be operated in respectively resonance condition, and the effective value of controlling this harmonic wave carrys out regulation output power.
Power output regulating step is as follows:
1) first, according to given resonance-type inverters power output, the perunit value G of first-harmonic and each harmonic effective value in output voltage when obtaining resonance-type inverters fundamental voltage output of voltage and being operated in resonance condition k, k=1,3,5,7 ..., described perunit value is taking the first-harmonic effective value in resonance-type inverters output voltage waveforms 50% duty ratio situation as reference value, G kmaximum is 1/k; K is positive odd number;
2) work as G 1when≤1/k, k=1,3,5,7 ..., find out the maximum k value meeting the demands, control the 1/k that resonance-type inverters switching frequency is resonance frequency, make k subharmonic be operated in resonance condition.For full-bridge phase shifting formula resonance-type inverters, carry out regulation output power by the phase shifting angle that regulates current transformer diagonal switching device driving pulse, in the time that switching frequency is resonance frequency, if phase shifting angle is greater than with reference to phase shifting angle (k=1,3,5,7 ...), switching frequency is become to the 1/k of resonance frequency, make k subharmonic be operated in resonance condition; For semibridge system resonance-type inverters, by regulating the recently regulation output power of duty of converter switches device drive pulse, in the time that switching frequency is resonance frequency, if duty ratio is less than with reference to duty ratio (k=1,3,5,7 ...), switching frequency is become to the 1/k of resonance frequency, make k subharmonic be operated in resonance condition;
3) in the time that k subharmonic is operated in resonance condition, if G kwhen≤1/ (k+2), k=1,3,5,7 ..., make switching frequency be reduced to 1/ (k+2) of resonance frequency, make (k+2) subharmonic be operated in resonance condition.For full-bridge phase shifting formula resonance-type inverters, reference phase shifting angle scope when k subharmonic is operated in resonance condition is (k=1,3,5,7 ...); For semibridge system resonance-type inverters, reference duty cycle range when k subharmonic is operated in resonance condition is (k=1,3,5,7 ...).
Resonance-type inverters has Dead Time, and for full-bridge phase shifting formula resonance-type inverters, this dead band time equivalence is certain phase shifting angle, and the reference phase shifting angle of described k subharmonic should deduct Dead Time equivalence phase shifting angle; For semibridge system resonance-type inverters, this dead band time equivalence is the duty ratio of switching device driving pulse, and the reference duty ratio of described k subharmonic should deduct Dead Time equivalence duty ratio;
Power regulating method of the present invention is the switching frequency by reducing resonance-type inverters, make k subharmonic in the output voltage waveforms of resonance-type inverters be operated in resonance condition, allow k subfrequency approximate resonance frequency, recently regulate the harmonic wave effective value of resonance-type inverters output voltage waveforms by controlling the duty of resonance-type inverters output voltage waveforms, realize the adjusting of power output.
Compared with existing method, power regulating method of the present invention has following characteristics:
1, can significantly reduce inverter switching frequency, switching frequency is only original 1/k, and switching loss reduces greatly;
2, adopt harmonic propagation power, under same power output, phase shift angular range or duty cycle adjustment scope are larger, and power adjustments precision is higher;
3, adopt harmonic propagation power, its phase shifting angle is less, is more easily operated in soft on off state, and loss still less;
4, adopt harmonic propagation power, its each harmonic component frequency also significantly reduces, and electromagnetic interference reduces;
5, driving pulse is continuous, and load voltage ripple is little.
The present invention can be applicable to various electric energy wireless transmissions, induction heating and other possible high-frequency electrical energys conversion field.
Brief description of the drawings
Fig. 1 is full-bridge phase shifting formula resonant current transformer topology block diagram;
Fig. 2 is semibridge system resonant current transformer topology block diagram;
Fig. 3 is the harmonic content distribution map of full-bridge phase shifting formula resonance-type inverters output voltage under different phase shifting angles;
Fig. 4 is full-bridge phase shifting formula resonant current transformer power regulating method flow chart;
Fig. 5 is triple-frequency harmonics inverter output voltage and output current experimental waveform when phase shift 1.9 is spent while being operated in resonance condition;
In figure, 1 DC power supply, 2 resonance-type inverters, 3 inverter output variable transducers, 4 resonant capacitances, 5 inductance, 6 load input variable transducers, 7 loads, 8 drive circuits, 9 frequencies and phase detecting module, 10 master controllers.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
Embodiment mono-is full-bridge phase shifting formula resonance-type inverters structure.
Figure 1 shows that full-bridge phase shifting formula resonant current transformer topology block diagram, its basic composition and connected mode are as follows.
Full-bridge phase shifting formula resonance-type inverters comprises: DC power supply 1, resonance-type inverters 2, inverter output variable transducer 3, resonant capacitance 4, inductance 5, load input variable transducer 6, load 7, drive circuit 8, frequency and phase detecting module 9, master controller etc. 10.
The positive and negative terminal of DC power supply 1 is connected respectively to the direct-flow input end of resonance inverter 2; Resonance inverter 2 output high voltages, resonance inverter 2 is connected through series connection or two terminals with resonant capacitance 4 in parallel; Two terminals of resonant capacitance 4 are connected or are connected in parallel with inductance 5, and two terminals of inductance 5 are connected with load 7.Between the output of resonance-type inverters 2 and resonant capacitance 4, be provided with inverter output variable transducer 3, inverter output variable transducer 3 comprises voltage sensor and current sensor, detects respectively output voltage and the output current of inverter 2.The inverter output voltage that inverter output variable transducer 3 detects and current signal send to frequency and phase detecting module 9, and the phase signal between the frequency signal of the inverter output current obtaining and inverter output voltage and inverter output current is sent to master controller 10 by frequency and phase detecting module 9.All signals that inverter output variable transducer 3 detects all send to master controller 10.Between inductance 5 and load 7, there is load input variable transducer 6, comprise voltage sensor and current sensor, respectively the load detecting 7 output voltages and output current signal are sent to master controller 10.Main controller 10 sends Driven by inverter pulse signal to drive circuit 8, and drive circuit 8 is connected to the driving terminals of each switching device of inverter.
Described DC power supply 1 can be the DC source that AC power obtains after rectification, can be also the DC source such as storage battery or capacitor.DC power supply can be voltage source, can be also current source, respectively corresponding voltage type inverter and current source inverter, below as an example of voltage source inverter example the structure of the described resonance-type inverters 2 of explanation.
Described resonance-type inverters 2 is full-bridge topologies, and each switches set in every cover inversion unit can be individual devices, can be also series connection or the formation in parallel of multiple devices.Power device in inverter frequency multiplier circuit can be the full-control type devices such as MOSFET, IGBT, IGCT, and device can carry antiparallel fly-wheel diode, also can separately add antiparallel fly-wheel diode.
Described inverter output variable transducer 3 comprises inverter output voltage transducer and inverter 2 output current transducers.Inverter output voltage transducer is connected on two lead-out terminals of inverter 2; Inverter output current transducer is connected in series on an output line of inverter.
Described resonant capacitance 4 can be single or multiple electric capacity compositions; Resonant capacitance 4 can or carry out connection in series-parallel connection with inductance 5 series, parallel.
Described inductance 5 can be single inductance, can be also the leakage inductance of transformer, equivalent inductance that also can other circuit structures.
Described load input variable transducer 6 comprises load output voltage sensor and load output current transducer.Load output voltage sensor is connected on two lead-out terminals of resonance-type inverters 2; Load output current transducer is connected in series in an input line of load.
Described load 7 can be actual loading, also can be through the equivalent load of other circuit structure.
After treatment, each switching device that the output of drive circuit is connected to inverter frequency multiplier circuit drives terminals to the drive pulse signal that described drive circuit 8 sends master controller 10, drives each switching device of inverter frequency multiplier circuit.
Inverter output voltage and output current that described frequency and phase detecting module 9 obtain according to inverter output variable transducer 3, calculate the frequency of inverter output current and the phase difference of inverter output voltage and output current and send to master controller 10, to realize described frequency and the closed-loop control of phase difference.
Described master controller 10, the signal of sending according to load input variable transducer 6 and inverter output variable transducer 3, calculates current power output, regulates the phase shifting angle of resonance-type inverters.Then phase shifting angle and switching frequency are judged, if unreasonable, change switching frequency and calculate phase shifting angle required under same power output, control through dead band, form drive pulse signal, send to drive circuit 8.
Full-bridge phase shifting formula resonance-type inverters power output control method step is as follows:
1) first, according to given resonance-type inverters power output, the perunit value G of first-harmonic and each harmonic effective value in the output voltage when obtaining resonance-type inverters fundamental voltage output of voltage composition and being operated in resonance condition k, k=1,3,5,7 ..., described perunit value is taking the first-harmonic effective value in resonance-type inverters output voltage waveforms 50% duty ratio situation as reference value, G kmaximum is 1/k.G kbe defined as (k=1,3,5,7...) wherein, U pkfor k subharmonic voltage effective value, U dcbe direct current input side voltage, α is phase shifting angle, the G under different phase shifting angle α kdistribute as shown in Figure 3, limit and in Fig. 3, be only shown to 9 subharmonic because of length, wherein, shown in " 1 time " be the perunit value of resonance-type inverters fundamental voltage output of voltage composition effective value with the variation of phase shifting angle, the perunit value of the 3 subharmonic compositions that are respectively resonance-type inverters output voltage, 5 subharmonic compositions, 7 subharmonic compositions and the 9 subharmonic composition effective values shown in " 3 times ", " 5 times ", " 7 times " and " 9 times " is with the variation of phase shifting angle.
2) work as G 1when≤1/k, k=1,3,5,7 ... find out the maximum k value meeting the demands, the 1/k that to control resonance-type inverters switching frequency be resonance frequency, makes k subharmonic be operated in resonance condition, and the phase shifting angle that regulates current transformer diagonal switching device driving pulse just can regulation output power, in the time that switching frequency is resonance frequency, if phase shifting angle is greater than with reference to phase shifting angle (k=1,3,5,7...), becomes switching frequency the 1/k of resonance frequency, makes k subharmonic be operated in resonance condition.
3) in the time that k subharmonic is operated in resonance condition, if G kwhen≤1/ (k+2), make switching frequency be reduced to 1/ (k+2) of resonance frequency, make (k+2) subharmonic be operated in resonance condition, control phase shifting angle regulation output power, reference phase shifting angle scope when k subharmonic is operated in resonance condition is (k=1,3,5,7...).
Embodiment bis-: half-bridge resonance type converter topologies.
Figure 2 shows that semibridge system resonant current transformer topology block diagram, be with embodiment mono-difference: the resonance-type inverters 2 of (1) embodiment bis-is semibridge system resonance-type inverters; (2) semibridge system resonance-type inverters is passed through the recently regulation output power of duty of by-pass cock device drive pulse, and embodiment mono-carrys out regulation output power by the phase shifting angle of adjusting resonance-type inverters.
Semibridge system resonance-type inverters power output control method step is as follows:
1) first, according to given resonance-type inverters power output, the perunit value G of first-harmonic and each harmonic effective value in the output voltage when obtaining resonance-type inverters fundamental voltage output of voltage composition and being operated in resonance condition k, k=1,3,5,7 ..., described perunit value is taking the first-harmonic effective value in resonance-type inverters output voltage waveforms 50% duty ratio situation as reference value, G kmaximum is 1/k.
2) work as G 1when≤1/k, k=1,3,5,7 ... find out the maximum k value meeting the demands, the 1/k that to control resonance-type inverters switching frequency be resonance frequency, makes k subharmonic be operated in resonance condition, regulates the converter switches device drive pulse duty factor just can regulation output power, in the time that switching frequency is resonance frequency, if duty ratio is less than with reference to duty ratio (k=1,3,5,7...), becomes switching frequency the 1/k of resonance frequency, makes k subharmonic be operated in resonance condition.
3) in the time that k subharmonic is operated in resonance condition, if G kwhen≤1/ (k+2), make switching frequency be reduced to 1/ (k+2) of resonance frequency, make (k+2) subharmonic be operated in resonance condition, by-pass cock device drive pulse duty factor just can regulation output power, and reference duty cycle range when k subharmonic is operated in resonance condition is (k=1,3,5,7...).
For power output adjustment process of the present invention is described, provide the full-bridge phase-shifting resonance type inverter power control method flow chart shown in Fig. 4, semibridge system resonance-type inverters power regulating method flow process and Fig. 4 roughly the same, no longer provide here.
As shown in Figure 4, first determine the inverter power output needing, required phase shifting angle when calculating resonance-type inverters fundamental voltage output of voltage and being operated in resonance condition, if fundamental voltage amplitude is greater than the maximum of k subharmonic effective value under this phase shifting angle, forms the phase-shift pulse signal of controlling through dead band; If fundamental voltage amplitude is less than or equal to the maximum of k subharmonic effective value under this phase shifting angle, calculate and by-pass cock frequency and phase shifting angle, form the phase-shift pulse signal of controlling through dead band, export finally by drive circuit.
Fig. 5 is the experimental waveform of full-bridge phase shifting formula resonant current transformer power regulating method in the present invention, inverter output voltage and output current wave (voltage: 125V/ lattice, electric current: 34A/ lattice) when 1.9 ° of triple-frequency harmonics phase shifts.
Above-described with reference to phase shifting angle with reference to duty ratio, can there is certain mobility scale according to actual conditions.

Claims (4)

1. the power output control method of a resonant current transformer, it is characterized in that, described power output control method is the switching frequency by reducing resonance-type inverters, make in the output voltage waveforms of resonance-type inverters certain harmonic operation in resonance condition, recently regulate certain subharmonic effective value of resonance-type inverters output voltage by controlling the duty of resonance-type inverters output voltage, realize the adjusting of power output;
Described power output regulating step is as follows:
1) first, according to given resonance-type inverters power output, the perunit value G of first-harmonic and each harmonic effective value in output voltage when obtaining resonance-type inverters fundamental voltage output of voltage and being operated in resonance condition k, k=1,3,5,7 ..., described perunit value is taking the first-harmonic effective value in resonance-type inverters output voltage waveforms 50% duty ratio situation as reference value, G kmaximum is 1/k; K is positive odd number;
2) work as G 1when≤1/k, k=1,3,5,7 ..., find out the maximum k value meeting the demands, control the 1/k that resonance-type inverters switching frequency is resonance frequency, make k subharmonic be operated in resonance condition, recently regulate k subharmonic effective value in resonance-type inverters output voltage by the duty of controlling resonance-type inverters output voltage, realize the adjusting of power output;
3) in the time that k subharmonic is operated in resonance condition, if G kwhen≤1/ (k+2), k=1,3,5,7 ..., control switch frequency is reduced to 1/ (k+2) of resonance frequency, makes (k+2) subharmonic be operated in resonance condition, recently regulate (k+2) subharmonic effective value in resonance-type inverters output voltage by the duty of controlling resonance-type inverters output voltage, realize the adjusting of power output.
2. the power output control method of resonant current transformer according to claim 1, is characterized in that, for full-bridge phase shifting formula resonance-type inverters, carrys out regulation output power by the phase shifting angle that regulates current transformer diagonal switching device driving pulse; Described power output regulating step 2) in, in the time that switching frequency is resonance frequency, if phase shifting angle is greater than with reference to phase shifting angle switching frequency is become to the 1/k of resonance frequency, make k subharmonic be operated in resonance condition; Described power output regulating step 3) in, reference phase shifting angle scope when k subharmonic is operated in resonance condition is
3. the power output control method of resonant current transformer according to claim 1, it is characterized in that, for semibridge system resonance-type inverters, by regulating the recently regulation output power of duty of converter switches device drive pulse, described power output regulating step 2) in, in the time that switching frequency is resonance frequency, if duty ratio is less than with reference to duty ratio switching frequency is become to the 1/k of resonance frequency, make k subharmonic be operated in resonance condition; Described power output regulating step 3) in, reference duty cycle range when k subharmonic is operated in resonance condition is 1 kπ arccos k k + 2 ~ 1 2 ( k = 1,3,5,7 . . . ) .
4. the power output control method of resonant current transformer according to claim 1, it is characterized in that, described resonance-type inverters has Dead Time, for full-bridge phase shifting formula resonance-type inverters, this dead band time equivalence is certain phase shifting angle, and the reference phase shifting angle of described k subharmonic should deduct Dead Time equivalence phase shifting angle; For semibridge system resonance-type inverters, this dead band time equivalence is the duty ratio of switching device driving pulse, and the reference duty ratio of described k subharmonic should deduct Dead Time equivalence duty ratio.
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