CN113098445B - Dynamic tuning control method based on auxiliary sawtooth power supply - Google Patents
Dynamic tuning control method based on auxiliary sawtooth power supply Download PDFInfo
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- CN113098445B CN113098445B CN202110474426.0A CN202110474426A CN113098445B CN 113098445 B CN113098445 B CN 113098445B CN 202110474426 A CN202110474426 A CN 202110474426A CN 113098445 B CN113098445 B CN 113098445B
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/02—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings
- H03J5/14—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with variable tuning element having a number of predetermined settings and adjustable to a desired one of these settings operated by auxiliary power
- H03J5/146—Settings desired by a switch controlled together with the tuning member and which stops the control as soon as a desired position is reached
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
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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
Abstract
The invention relates to a dynamic tuning control method based on an auxiliary sawtooth power supply, wherein a system comprising a resonant network adopts a direct current power supply and an amplitude-adjustable sawtooth power supply which are connected in series to respectively compensate positive and negative half cycles of square waves output by an original conversion circuit, and when the output voltage of a converter lags behind the output current, the sawtooth circuit compensates the square waves which gradually increase the peak voltage of the output of the converter; when the output voltage of the converter leads the output current, the sawtooth wave circuit compensates the square wave which gradually reduces the peak voltage of the output of the converter; the output voltage and current of the converter reach the same phase through sawtooth wave compensation, and the resonant circuit always keeps working in an optimal resonant state, so that the converter maintains an optimal switching state. The method simultaneously reduces the reactive power of the resonant network, increases the active power, and improves the efficiency and the power capacity of the conversion system.
Description
Technical Field
The invention relates to the technical field of dynamic tuning of a resonant network system, in particular to a dynamic tuning control method based on an auxiliary sawtooth power supply.
Background
Resonant transformation is an important method for realizing soft switching of a power electronic system, and is widely used in the field of power electronics. In practical applications, the parameters of the resonant network may change due to aging of system components, change in wireless power transmission distance, or change in transmission medium. These parameter variations can easily lead to system detuning, reducing system efficiency and even damaging switching elements.
In order to return to a normal steady state when a resonance system is detuned, various tuning techniques have been proposed in the prior art, which are mainly classified into frequency tuning and impedance tuning. Frequency tuning mainly controls the operating frequency of the system or changes the drive signal of the switching circuit. Impedance tuning is achieved primarily by adjusting the equivalent output impedance of the capacitor array, the controllable capacitor and the controllable inductor.
In the existing resonant network tuning technology, the following problems exist: for example, in the chinese patent of publication No. CN1065059488B, different capacitance compensation combinations are formed by switch control to achieve the tuning effect, but when the tuning accuracy requirement is high, the number of capacitors and switch tubes required by the switch capacitor array method is large, which causes the problems of large size of the tuning circuit, complicated tuning control algorithm, high cost, and the like, and only the compensation tuning of a limited number of discrete capacitance values can be achieved. For example, in chinese patent publication nos. CN103199634a and CN209730906U, the conduction angle of the switching tube is controlled by using the phase-controlled capacitor and the phase-controlled inductor to achieve the tuning purpose, but the phase-controlled capacitor and the inductor tuning method require high-frequency synchronization signals to control the conduction angle of the switching tube, so that the switching loss is large due to high switching frequency. For example, in chinese patent publication No. CN109818611B, the tuning method based on phase-locked loop frequency tracking control adjusts the working frequency of the converter in real time by tracking the resonant frequency of the loop resonant network, and although the method is easy to implement, the system resonant frequency is changed. For example, in chinese patent publication No. CN107769369a, an auxiliary converter is used to generate a voltage with an adjustable phase difference from the output voltage of the main converter in primary tuning, and the phase difference between the main converter and the auxiliary converter is controlled to make the equivalent impedance of the primary zero.
Disclosure of Invention
The invention aims to solve the technical problem of providing a dynamic tuning control method based on an auxiliary sawtooth power supply, which ensures that the system keeps resonance working under the original inherent resonance frequency by adjusting the working state of the auxiliary sawtooth power supply when the system containing a resonance network is detuned, and ensures that the system works under the set optimal performance.
In order to solve the technical problems, the invention adopts the following technical scheme:
the utility model provides a dynamic tuning control method based on auxiliary sawtooth power, includes converter NA, resonant network TC and load XL that link gradually, its characterized in that: the DC power supply Ep and the amplitude-adjustable sawtooth power supply Es are connected in series and then connected with the input end of the converter NA, a current sensor IS IS arranged between the converter NA and the resonance network TC, the output end of the converter NA IS connected with the voltage sensor UM, the output end of the current sensor IS and the output end of the voltage sensor UM are both connected with the phase detection circuit PD, and the phase detection circuit PD IS connected with the controller KP; the output driving signal of the controller KP is used for controlling the working states of the amplitude-adjustable sawtooth power supply Es and the converter NA; the dynamic tuning control method comprises the following specific steps:
the controller KP sets the operating frequency of the conversion circuit NA to a fixed value f 0 Collecting output square wave voltage U of conversion circuit by using voltage sensor UM n Collecting resonant circuit current I of conversion circuit by using current sensor IS n The current signal and the voltage signal acquired by the voltage sensor UM and the current sensor IS are input into the phase detection circuit PD to obtain a phase difference
When the phase difference is
When the voltage is not 0, the magnitude of the output value of the phase discrimination circuit PD is used for changing the sawtooth voltage amplitude A of the sawtooth power supply Es m2 ；
When (when)
When the system is in a capacitive detuning state, namely the voltage phase is lagged behind the current phase, the sawtooth power supply Es is controlled to output a slope coefficient k=1, the sawtooth wave circuit compensates square waves which enable the peak voltage output by the converter to be gradually increased, and after sawtooth voltage compensation, the phase difference between the current and the voltage of the resonant network is enabled>
A reduction;
when (when)
When the system is in an inductive detuning state, namely the voltage phase is advanced to the current phase, the sawtooth power supply output slope coefficient k= -1 is controlled, the sawtooth wave circuit compensates the square wave which gradually reduces the peak voltage output by the converter, and the phase difference between the current and the voltage of the resonant network is made after the sawtooth voltage compensation>
And (3) increasing.
Preferably, the controller KP sets the square wave voltage amplitude A of the DC power supply Ep m1 Sawtooth voltage amplitude A of sawtooth power supply Es with adjustable amplitude m2 A saw tooth voltage amplitude step value Deltau;
when (when)
When the controller sets the sawtooth wave with the sawtooth power supply voltage output slope coefficient k=1, the sawtooth power supply voltage amplitude is adjusted to be A m2 +Deltau, forming a square wave with rising amplitude;
when (when)
When the voltage is in the same state, the controller sets a sawtooth wave with a sawtooth power supply voltage output slope coefficient k= -1, and the sawtooth power supply voltage amplitude is adjusted to A m2 Deltau, forming a square wave of decreasing amplitude.
Preferably, the transformed transformation circuit outputs square wave voltage U by harmonic analysis and Fourier transformation and linear superposition principles n And resonant tank current I n Phase difference between
The expression of (2) is as follows:
wherein Z is p Equivalent impedance of the input end of the system; k is a slope control coefficient, and the output of the direct current power supply is constant; a is that m1 A square wave voltage amplitude of a direct current power supply Ep; a is that m2 The sawtooth voltage amplitude of the sawtooth power supply Es with adjustable amplitude is obtained;
in the form of an exponential component of the square wave voltage, +.>
Exponential form of a fundamental component for a sawtooth voltage component and +.>
The sawtooth voltage component is an exponential form of the second fundamental component.
Preferably, the high frequency converter NA employs a switching converter circuit having a topology.
Preferably, the sawtooth power supply Es is used to achieve simultaneous compensation of the positive and negative half cycles of the square wave, or to compensate either the positive half cycle or the negative half cycle separately.
Preferably, the sawtooth power supply Es is arranged within the topology of the converter NA.
Preferably, the resonant network comprises a series resonant network, a parallel resonant network, a series-parallel resonant network, or a wireless power transfer network.
Preferably, the reasons for the change in the resonant network parameters include a change due to aging of the element, a change in the radio energy transmission distance, or a change in the parameters due to a change in the transmission medium.
Preferably, the energy of the amplitude adjustable sawtooth power supply Es is obtained by a direct current power supply Ep.
Preferably, the sawtooth compensation adds a delay per setting during each compensation period.
The dynamic tuning control method based on the auxiliary sawtooth power supply has the beneficial effects that: when a system containing a resonance network is detuned, the resonance network system can always work in a resonance state under the detuning disturbance by adjusting the sawtooth power supply voltage output slope coefficient and the sawtooth power supply voltage amplitude value, so that higher transmission efficiency and power are ensured. Furthermore, the dynamic tuning control method enables the system to perform tuning control during both capacitive detuning and inductive detuning.
Drawings
Fig. 1 is a schematic circuit configuration and control diagram of a resonant network system according to the present invention.
Fig. 2 is a flow chart of a tuning control method of the dynamic tuning control method based on the auxiliary sawtooth power supply.
Fig. 3 is a plot of tuning waveforms for different degrees of detuning in the present invention.
Detailed Description
The invention is further described below with reference to the drawings and specific preferred embodiments.
The circuit structure comprising a resonant network system IS shown in figure 1, and comprises a converter NA, a resonant network TC and a load XL which are sequentially connected, wherein a direct-current power supply Ep and an amplitude-adjustable sawtooth power supply Es are connected in series and then are connected with the input end of the converter NA, a current sensor IS IS arranged between the converter NA and the resonant network TC, the output end of the converter NA IS connected with a voltage sensor UM, the output end of the current sensor IS and the output end of the voltage sensor UM are both connected with a phase discrimination circuit PD, and the phase discrimination circuit PD IS connected with a controller KP; the output end of the controller KP is connected with the control signal input end of the amplitude-adjustable sawtooth power supply Es and the converter NA, and the output driving signal of the controller KP is used for controlling the working states of the amplitude-adjustable sawtooth power supply Es and the converter NA.
The dynamic tuning control method based on the auxiliary sawtooth power supply is shown in fig. 2, and comprises the following specific steps:
step one: the controller sets the working frequency of the conversion circuit to be customized f 0 Entering the next step;
step two: the controller sets square wave voltage amplitude A m1 Saw tooth voltage amplitude A m2 The step value of the sawtooth voltage amplitude is delta u;
step three: the controller sets a sawtooth power supply slope control coefficient k;
step four: output voltage U of the conversion circuit is respectively acquired by utilizing a voltage Hall sensor and a current Hall sensor n And transmitting end resonant circuit current I n After signal conditioning, the signals are input into a phase detection circuit to judge whether the phase difference is 0 or not, and the next step is carried out;
step five: if the phase difference is 0, returning to the fourth step; if the phase difference is smaller than zero, entering a step six; if the phase difference is greater than zero, entering a step seven;
step six: the system is judged to be in a capacitive detuning state, the controller sets a sawtooth wave with a sawtooth power supply voltage output slope coefficient k=1, and the sawtooth power supply amplitude is adjusted to be A m2 +Deltau, forming square wave with ascending amplitude, returning to the step four;
step seven: judging that the system is in an inductive detuning state, setting a sawtooth wave with a sawtooth wave power supply voltage output slope coefficient k= -1 by a controller, and adjusting the sawtooth power supply amplitude to A m2 Δu, forming a square wave with decreasing amplitude, returning to step four.
In the embodiment, in step 4, the transformed transformation circuit outputs the square wave voltage U by harmonic analysis, fourier transform and linear superposition principle n And resonant tank current I n Phase difference between
The expression of (2) is as follows:
wherein Zp Is that Equivalent impedance of the system input end; k is a slope control coefficient, and the output of the direct current power supply is constant; a is that m1 A square wave voltage amplitude of a direct current power supply Ep; a is that m2 The sawtooth voltage amplitude of the sawtooth power supply Es with adjustable amplitude is obtained;
in the form of an exponential component of the square wave voltage, +.>
Exponential form of a fundamental component for a sawtooth voltage component and +.>
The sawtooth voltage component is an exponential form of the second fundamental component.
From the above phase difference
As can be seen from the expression of (a), by adjusting the amplitude A of the auxiliary sawtooth power supply voltage m2 The input impedance angle of the system can be adjusted>
Is of a size of (a) and (b). When the system is in resonance, the phase difference +.>
Is 0; by controlling sawtooth supply amplitude A when the system is in capacitive and inductive detuning m2 Increasing and decreasing, so that the system is restored to the resonance working state.
Preferably, the high frequency converter NA employs a switching converter circuit having a topology.
Preferably, the sawtooth power supply Es is used to achieve simultaneous compensation of the positive and negative half cycles of the square wave, or to compensate either the positive half cycle or the negative half cycle separately.
Preferably, the sawtooth power supply Es is arranged within the topology of the converter NA.
Preferably, the resonant network comprises a series resonant network, a parallel resonant network, a series-parallel resonant network, or a wireless power transfer network.
Preferably, the reasons for the change in the resonant network parameters include a change due to aging of the element, a change in the radio energy transmission distance, or a change in the parameters due to a change in the transmission medium.
Preferably, the energy of the amplitude adjustable sawtooth power supply Es is obtained by a direct current power supply Ep.
Preferably, the sawtooth compensation adds a delay per setting during each compensation period.
When the system containing the resonant network is detuned, as shown in fig. 3, the tuning waveforms of different degrees of detuning are shown, when the phase difference is
When the system is in a capacitive detuning state, i.e. the voltage phase is delayed from the current phase, the sawtooth power supply output slope coefficient k=1 is controlled, the sawtooth circuit compensates the square wave which gradually increases the peak voltage output by the converter, and after sawtooth voltage compensation, the phase difference between the current and the voltage of the resonant network can be increased>
Decreasing until it is 0 or near 0. When->
When the system is in an inductive detuning state, i.e. the voltage phase is advanced from the current phase, the sawtooth power supply output slope coefficient k= -1 is controlled, the sawtooth circuit compensates the square wave which gradually reduces the peak voltage output by the converter, and after sawtooth voltage compensation, the phase difference between the current and the voltage of the resonant network can be increased>
Increasing until it is 0 or near 0.
In actual operation, the square wave voltage amplitude A m1 =20v, sawtooth voltage amplitude a m2 =0v, the operating frequency of the conversion circuit is f 0 A resonant network system of 100KHZ is exemplified.
When the system detects the phase difference between the output voltage and the current
Setting a sawtooth voltage amplitude stepping value delta u=1v, setting a sawtooth power supply slope control coefficient k=1, and adjusting the sawtooth voltage amplitude to be A through a controller m2 +1, continuously adjusting the amplitude a plurality of times, the phase difference during the adjustment being +.>
Gradually increase when the sawtooth power supply amplitude A m1 When the phase difference is 18V, the phase difference is close to 0, and the system recovers the resonance state;
the system detects the phase difference between the output voltage and the current
Saw-tooth voltage amplitude stepping value deltau=1v, saw-tooth power supply slope control coefficient k= -1, saw-tooth voltage amplitude is adjusted to a by a controller m2 -1, continuously adjusting the amplitude a plurality of times, the phase difference during the adjustment being +.>
Gradually decrease when the sawtooth power supply amplitude A m2 When the phase difference is close to 0 at the time of minus 9V, the system recovers the resonance state.
In summary, the dynamic tuning control method based on the auxiliary sawtooth power supply enables the system to perform tuning control during capacitive detuning and inductive detuning, the amplitude of the tuning sawtooth power supply voltage required during the capacitive detuning is increased, the amplitude of the tuning sawtooth power supply voltage required during the inductive detuning is decreased, and the method has a good tuning effect on the inductive detuning.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (10)
1. The utility model provides a dynamic tuning control method based on auxiliary sawtooth power, includes converter NA, resonant network TC and load XL that link gradually, its characterized in that: the DC power supply Ep and the amplitude-adjustable sawtooth power supply Es are connected in series and then connected with the input end of the converter NA, a current sensor IS IS arranged between the converter NA and the resonance network TC, the output end of the converter NA IS connected with the voltage sensor UM, the output end of the current sensor IS and the output end of the voltage sensor UM are both connected with the phase detection circuit PD, and the phase detection circuit PD IS connected with the controller KP; the output driving signal of the controller KP is used for controlling the working states of the amplitude-adjustable sawtooth power supply Es and the converter NA; the dynamic tuning control method comprises the following specific steps:
the controller KP sets the operating frequency of the conversion circuit NA to a fixed value f 0 Collecting output square wave voltage U of conversion circuit by using voltage sensor UM n Collecting resonant circuit current I of conversion circuit by using current sensor IS n The current signal and the voltage signal acquired by the voltage sensor UM and the current sensor IS are input into the phase detection circuit PD to obtain a phase difference
When the phase difference is
When the voltage is not 0, the magnitude of the output value of the phase discrimination circuit PD is used for changing the sawtooth voltage amplitude A of the sawtooth power supply Es m2 ；
When (when)
When the system is in a capacitive detuning state, namely the voltage phase is lagged behind the current phase, the sawtooth power supply Es is controlled to output a slope coefficient k=1, the sawtooth wave circuit compensates square waves which enable the peak voltage output by the converter to be gradually increased, and after sawtooth voltage compensation, the phase difference between the current and the voltage of the resonant network is enabled>
A reduction;
when (when)
When the system is in an inductive detuning state, i.e. the voltage phase is advanced from the current phase, the output slope coefficient k= -1 of the sawtooth power supply is controlled, and the sawtooth circuit compensates to make the converter output peak voltageGradually reduced square wave, and compensating sawtooth voltage to make phase difference between current and voltage of resonant network +.>
And (3) increasing.
2. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the controller KP sets the square wave voltage amplitude A of the direct current power supply Ep m1 Sawtooth voltage amplitude Am of amplitude-adjustable sawtooth power supply Es 2 A saw tooth voltage amplitude step value Deltau;
when (when)
When the controller sets the sawtooth wave with the sawtooth power supply voltage output slope coefficient k=1, the sawtooth power supply voltage amplitude is adjusted to be A m2 +Deltau, forming a square wave with rising amplitude;
when (when)
When the voltage is in the same state, the controller sets a sawtooth wave with a sawtooth power supply voltage output slope coefficient k= -1, and the sawtooth power supply voltage amplitude is adjusted to A m2 Deltau, forming a square wave of decreasing amplitude.
3. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the transformed transformation circuit outputs square wave voltage U through harmonic analysis method and Fourier transformation and linear superposition principle n And resonant tank current I n Phase difference between
The expression of (2) is as follows:
wherein Z is p Equivalent impedance of the input end of the system; k is a slope control coefficient, and the output of the direct current power supply is constant; a is that m1 A square wave voltage amplitude of a direct current power supply Ep; a is that m2 The sawtooth voltage amplitude of the sawtooth power supply Es with adjustable amplitude is obtained;
in the form of an exponential component of the square wave voltage, +.>
Exponential form of a fundamental component for a sawtooth voltage component and +.>
The sawtooth voltage component is an exponential form of the second fundamental component.
4. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the high frequency converter NA employs a switching converter circuit having a topology.
5. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the sawtooth power supply Es is used to achieve simultaneous compensation of the positive and negative half cycles of the square wave, or to compensate either the positive half cycle or the negative half cycle separately.
6. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the sawtooth power supply Es is arranged within the topology of the converter NA.
7. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the resonant network comprises a series resonant network, a parallel resonant network, a series-parallel resonant network or a wireless power transmission network.
8. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the reasons for the resonant network parameter change include a change caused by element aging, a change in the wireless power transmission distance, or a change in a parameter caused by a change in the transmission medium.
9. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: the energy of the amplitude-adjustable sawtooth power supply Es is obtained by a direct-current power supply Ep.
10. The method for controlling dynamic tuning based on auxiliary sawtooth power supply according to claim 1, wherein: during each compensation period, sawtooth compensation adds delay as set.
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| DE862774C (en) * | 1950-03-08 | 1953-01-12 | Rca Corp | Device for frequency control of a vibration generator |
| IL73671A0 (en) * | 1983-12-22 | 1985-02-28 | Gen Electric | X-ray generator with phase-advance voltage feedback |
| JPH11225472A (en) * | 1998-02-04 | 1999-08-17 | Shintom Co Ltd | Power supply unit and electronic appliance therewith |
| CN111219295A (en) * | 2020-03-02 | 2020-06-02 | 南京信息工程大学 | Wind power curve compensation control device and method for wind driven generator |
| CN111308247A (en) * | 2020-03-15 | 2020-06-19 | 东南大学 | WPT system harmonic judgment method based on unilateral detection current phase change rate detection |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8796884B2 (en) * | 2008-12-20 | 2014-08-05 | Solarbridge Technologies, Inc. | Energy conversion systems with power control |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE862774C (en) * | 1950-03-08 | 1953-01-12 | Rca Corp | Device for frequency control of a vibration generator |
| IL73671A0 (en) * | 1983-12-22 | 1985-02-28 | Gen Electric | X-ray generator with phase-advance voltage feedback |
| JPH11225472A (en) * | 1998-02-04 | 1999-08-17 | Shintom Co Ltd | Power supply unit and electronic appliance therewith |
| CN111219295A (en) * | 2020-03-02 | 2020-06-02 | 南京信息工程大学 | Wind power curve compensation control device and method for wind driven generator |
| CN111308247A (en) * | 2020-03-15 | 2020-06-19 | 东南大学 | WPT system harmonic judgment method based on unilateral detection current phase change rate detection |
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