CN114784995A - Wireless charging system with transformer and resonance parameter compensation method thereof - Google Patents
Wireless charging system with transformer and resonance parameter compensation method thereof Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
- H02J50/12—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling of the resonant type
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/10—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers
- H02M5/12—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using transformers for conversion of voltage or current amplitude only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
Abstract
The invention discloses a wireless charging system with a transformer and a resonance parameter compensation method thereof, belonging to the technical field of wireless charging, wherein the system comprises a direct current power supply, a high-frequency inverter circuit, a primary side compensation network, a secondary side compensation network and a rectification circuit which are sequentially connected, and further comprises a step-down transformer, wherein the secondary side compensation network is connected with the rectification circuit through the step-down transformer; the secondary side compensation network is connected in series with a leakage inductance compensation capacitor CTLeakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTAnd (4) resonating. According to the invention, the step-down transformer is introduced in front of the rectifying circuit, so that the low-voltage and high-current output of the system is realized, and the high-current charging requirement is met; leakage inductance compensation capacitor C connected in series with secondary side compensation networkTCan offset the system harmonic caused by the step-down transformer introduced by the systemDue to the influence of vibration, the system works in a resonance state, so that the wireless charging efficiency is improved.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a wireless charging system with a transformer and a resonance parameter compensation method thereof.
Background
The wireless power transmission technology is widely applied to the fields of smart homes, medical equipment, traffic, aerospace and the like due to the advantages of safety, convenience, low maintenance cost, adaptability to severe weather and the like. The wireless power transmission mainly includes electromagnetic induction type, magnetic coupling resonance type, radio frequency microwave type, ultrasonic transduction type, laser type and other transmission modes, wherein the magnetic coupling resonance type is widely applied because the magnetic coupling resonance type has the advantages of high transmission efficiency, strong anti-deviation characteristic and the like in the high-power wireless power transmission occasion.
The existing wireless charging system is mainly composed of a direct-current power supply, a high-frequency inverter circuit, a compensation network and a rectifying circuit which are connected in sequence, wherein the compensation network is directly connected with a full-bridge rectifying module and converts alternating current into direct current to supply to a load; on the other hand, the charging efficiency is a key performance index of the wireless charging system, and is a factor that is not negligible in system design. After the efficiency of the wireless charging system reaches a certain threshold, especially when the charging efficiency reaches 90%, the improvement of the charging efficiency of the system is particularly difficult. In summary, how to realize high-efficiency low-voltage large-current output in a wireless charging system is an urgent technical problem to be solved in the field.
Disclosure of Invention
The invention aims to solve the problem that the existing wireless charging system cannot efficiently output low-voltage large current, and provides a wireless charging system with a transformer and a resonance parameter compensation method thereof.
The purpose of the invention is realized by the following technical scheme: a wireless charging system with a transformer comprises a direct-current power supply, a high-frequency inverter circuit, a primary side compensation network, a secondary side compensation network, a rectifying circuit and a step-down transformer, wherein the direct-current power supply, the high-frequency inverter circuit, the primary side compensation network, the secondary side compensation network and the rectifying circuit are connected in sequence; secondary side compensation network series leakage inductance compensation capacitor CTLeakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTAnd (5) resonating.
In one example, the primary side compensationThe network comprising a compensation inductance L1And a compensation capacitor C1And a compensation capacitor CpAnd a primary side coil LpThe secondary side compensation network comprises a secondary side coil Ls and a compensation capacitor CsAnd a compensation capacitor C2And a compensation inductance L2And leakage inductance compensation capacitor CT；
Compensation inductance L1Connected with the output end of the high-frequency inverter circuit and compensating the inductance L1The other end is connected with a compensation capacitor C1And a compensation capacitor CpCompensating capacitor C1The other end is connected to a high-frequency inverter circuit and a compensation capacitor CpThe other end and the primary side coil LpConnected to the primary side coil LpCoupled with a secondary side coil Ls, one end of which is connected with a compensation capacitor CsCompensating capacitor CsThe other end is connected with a compensation capacitor C2And compensation inductance L2Compensating capacitor C2Connected to the other end of the secondary side coil Ls and compensating the inductance L2And leakage inductance compensation capacitor CTAnd (4) connecting.
It should be further noted that the technical features corresponding to the above examples can be combined with each other or replaced to form a new technical solution.
The invention further provides a resonance parameter compensation method of the wireless charging system with the transformer, which is applied to the wireless charging system with the transformer formed by any one or a combination of a plurality of examples, and the method comprises the following steps:
calculating equivalent inductance L of step-down transformer lead-in systemT；
Leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTResonance according to equivalent inductance LTDetermining leakage inductance compensation capacitance CTThe capacitance value of (c).
In one example, the step-down transformer introduces an equivalent inductance L of the systemTThe calculation formula of (2) is as follows:
RT+jωLT＝jωLs1+jωLm//(jωL′s2+R′L)
and L's2＝n2Ls2，R′L＝n2RL
Wherein R isTRepresenting the equivalent resistance of the step-down transformer lead-in system; j represents an imaginary symbol; ω represents the resonance angular frequency; l iss1Showing the leakage inductance of the primary side of the step-down transformer; l iss2Representing secondary side leakage inductance of the step-down transformer; l ismRepresenting the excitation inductance of the step-down transformer; r isLRepresenting a rectifying circuit and a load RoThe equivalent load of (2); n represents the step-down transformer transformation ratio.
In one example, the leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTThe resonance satisfies:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system.
In one example, the calculating step-down transformer introduces the equivalent inductance L of the systemTThe method also comprises the following steps:
determining parameters of the step-down transformer, and calculating the primary coil L in the primary compensation networkpParameter, secondary side coil L in secondary side compensation networksParameter, primary side coil LpAnd secondary side coil LsAnd the resonant frequency f of the wireless charging system.
In one example, the resonance parameter compensation method further includes:
determining the compensation inductance L according to the resonance condition of the primary side compensation network1And a compensation capacitor C1And a compensation capacitor CpAnd (4) parameters.
In one example, the resonance condition of the primary-side compensation network satisfies:
wherein, ω is0Representing harmonics of a wireless charging systemAngular frequency of oscillation.
In one example, the compensation inductance L is determined according to a resonance condition of the secondary side compensation network2And a compensation capacitor C2And a compensation capacitor CsAnd (4) parameters.
In one example, the resonance condition of the secondary side compensation network satisfies:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system.
It should be further noted that the technical features corresponding to the above examples can be combined with each other or replaced to form a new technical solution.
Compared with the prior art, the invention has the beneficial effects that:
(1) in one example, a step-down transformer is introduced in front of a rectifying circuit, so that low-voltage large-current output of a system is realized, and the large-current charging requirement is met; leakage inductance compensation capacitor C connected in series with secondary side compensation networkTThe influence of a step-down transformer introduced into the system on the system resonance can be counteracted, so that the system works in a resonance state, and the wireless charging efficiency is improved.
(2) In one example, the invention is based on the equivalent inductance L of a step-down transformer lead-in systemTAnd leakage inductance compensation capacitor CTCan determine the leakage inductance compensation capacitance CTThe capacitance value of the step-down transformer is offset to offset the equivalent inductance of the step-down transformer, and the quick calculation of the system resonance parameters is realized.
(3) In an example, according to the resonance condition of the compensation network, parameters of each compensation capacitor and each compensation inductor in the compensation network can be further determined, and the quick calculation of the system resonance parameters is realized.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention.
FIG. 1 is a block circuit diagram of a system in one example of the invention;
FIG. 2 is a circuit diagram of a system in accordance with an example of the present invention;
FIG. 3 is a flow chart of a method in an example of the invention;
FIG. 4 is a system equivalent circuit diagram in one example of the invention;
FIG. 5 is a flow chart of a method in an example of the invention;
FIG. 6 is a waveform diagram of the output of a step-down transformer without the introduction of leakage inductance compensation capacitance in accordance with an example of the present invention;
fig. 7 is a waveform diagram of the output of the step-down transformer with the leakage inductance compensation capacitor according to an example of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that directions or positional relationships indicated by "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are directions or positional relationships described based on the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Furthermore, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The present invention aims to provide a wireless charging system for realizing high-efficiency low-voltage large-current output, in an example, as shown in fig. 1, the wireless charging system specifically includes a dc power supply, a high-frequency inverter circuit, a primary side compensation network, a secondary side compensation network and a rectifier circuit, which are connected in sequence, wherein the primary side compensation network and the secondary side compensation network form a compensation network; the system also comprises a step-down transformer, and a secondary side compensation network is connected with the rectifying circuit through the step-down transformer; the secondary side compensation network is connected in series with a leakage inductance compensation capacitor CTLeakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTAnd (4) resonating. Specifically, the direct-current power supply is a system input direct-current power supply and is converted into high-frequency square-wave alternating current through a high-frequency inverter circuit, a primary side compensation network is coupled with a secondary side compensation network, the high-frequency square-wave alternating current reaches the secondary side compensation network through the primary side compensation network, the secondary side compensation network further transmits the alternating current to a step-down transformer, the step-down transformer performs step-down processing on the alternating current and then transmits the alternating current to a rectification circuit, and the rectification circuit further converts the alternating current into direct current for output. In the example, a step-down transformer is introduced in front of a rectifying circuit, so that low-voltage output can be realized, theoretically, the primary side power (input end power) of the step-down transformer is equal to the secondary side power (output end power), and the secondary side current is obviously increased due to the reduction of the secondary side voltage, so that low-voltage large-current output of the system is realized, and the large-current charging requirement is met; leakage inductance compensation capacitor C connected in series with secondary side compensation networkTEquivalent inductance L with step-down transformer lead-in systemTResonance, compensating capacitance C by leakage inductanceTCounteracting equivalent inductance L of step-down transformer lead-in systemTAnd the static compensation of system resonance is realized, so that the system always works in a resonance state, and the wireless charging efficiency is improved.
In an example, as shown in fig. 2, the high-frequency inverter circuit is specifically a first half-bridge inverter circuit and a second half-bridge inverter circuit that have the same circuit structure and are connected in parallel, each half-bridge inverter circuit includes an upper half-bridge arm and a lower half-bridge arm that are connected in series, and each of the upper half-bridge arm and the lower half-bridge arm has the same circuit structure and is a switching device such as a field effect transistor. The grid electrode of the field effect transistor is connected with the controller, the drain electrode of the field effect transistor in the upper half bridge arm is connected with the positive electrode of the power input end, the source electrode of the switching device in the lower half bridge arm is connected with the negative electrode of the power input end, the source electrode of the field effect transistor in the upper half bridge arm is connected with the drain electrode of the switching device in the lower half bridge arm, the common connection point of the upper half bridge arm and the lower half bridge arm in the first half bridge inverter circuit outputs a voltage signal of one half bridge inverter circuit to the compensation network, and the common connection point of the upper half bridge arm and the lower half bridge arm in the first half bridge inverter circuit outputs a voltage signal of the other half bridge inverter circuit to the compensation network. As an option, each field effect transistor in the half-bridge inverter circuit is connected with an RCD absorption circuit in parallel and used for absorbing voltage spikes when the field effect transistor is switched on and off. The RCD absorption circuit comprises a freewheeling diode, a first capacitor and a first inductor, wherein the freewheeling diode is connected with the first capacitor in series and in parallel between the source electrode and the drain electrode of the field effect transistor, namely the drain electrode of the field effect transistor is connected to the drain electrode of the field effect transistor through the first capacitor and the freewheeling diode, and the first inductor is connected with the freewheeling diode in parallel. More specifically, the rectifier circuit is a full-bridge rectifier circuit, and a filter capacitor C is connected in parallel to an output end of the full-bridge rectifier circuitoTo output a stable dc voltage.
In one example, as shown in fig. 2, the primary-side compensation network includes a compensation inductor L1And a compensation capacitor C1And a compensation capacitor CpAnd a primary side coil LpThe secondary side compensation network comprises a secondary side lineCircle Ls and compensation capacitor CsAnd a compensation capacitor C2And a compensation inductance L2And leakage inductance compensation capacitor CT(ii) a Compensation inductance L1Connected with the output end of the first half-bridge inverter circuit in the high-frequency inverter circuit, and compensating the inductance L1The other end is connected with a compensation capacitor C1And a compensation capacitor CpCompensating capacitor C1The other end is connected to the output end of the first half-bridge inverter circuit in the high-frequency inverter circuit and a compensation capacitor CpThe other end and the primary side coil LpConnected to the primary side coil LpCoupled with a secondary side coil Ls, one end of which is connected with a compensation capacitor CsCompensating capacitor CsThe other end is connected with a compensation capacitor C2And compensation inductance L2Compensating capacitor C2Connected to the other end of secondary winding Ls and compensating inductance L2And leakage inductance compensation capacitor CTConnecting leakage inductance compensating capacitor CTThe transformer is connected to a primary side coil of a step-down transformer, a secondary side coil of the step-down transformer is coupled with a primary side coil of the step-down transformer, and the turn ratio of the primary side coil to the secondary side coil of the step-down transformer is n: 1. in this example, the high-frequency square-wave alternating current reaches the primary side coil Lp through the primary side compensation network, the primary side coil Lp transmits the electric energy to the secondary side coil Ls through resonance coupling, and the compensation network enables the system to work in a resonance state, counteracts the high-impedance influence of the transmission coil, and ensures high-efficiency electric energy transmission.
In an example, the present invention further includes a resonance parameter compensation method of a wireless charging system with a transformer, which is applied to the above preferred example, that is, the wireless charging system with a transformer shown in fig. 2, as shown in fig. 4, and the method includes:
calculating equivalent inductance L of step-down transformer lead-in systemT；
Leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTResonance according to equivalent inductance LTDetermining leakage inductance compensation capacitance CTThe capacitance value of (c).
Further, the capacitance C is compensated for leakage inductance for easy calculationTCapacitance value of (2) based on the leakage inductance equivalent model of the step-down transformerThe wireless charging system of the preferred example shown in fig. 2 is equivalent to an equivalent circuit shown in fig. 4, in which a full-bridge rectifier circuit and a load R are connectedoEquivalent to a load RL，
Ls1Representing a leakage inductance of a primary side of the step-down transformer; l iss2Representing secondary side leakage inductance of the step-down transformer; l ismRepresenting the excitation inductance of the step-down transformer; l 'is represented by equivalent leakage inductance and load of secondary side of the transformer's2＝n2Ls2，R′L＝n2RLAnd n is the transformer transformation ratio, namely the turn ratio of the primary side coil to the secondary side coil.
In one example, as can be seen from the leakage inductance model equivalent circuit diagram of the step-down transformer shown in fig. 4, the step-down transformer introduces the equivalent inductance L of the systemTThe calculation formula of (2) is as follows:
RT+jωLT＝jωLs1+jωLm//(jωL′s2+R′L)
wherein R isTRepresenting the equivalent resistance of the step-down transformer lead-in system; j represents an imaginary symbol; omega represents leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTThe resonant angular frequency.
At this time, the leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTThe resonance then has:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system. Based on the equivalent inductance LTDetermining leakage inductance compensation capacitance CTThe capacitance value of the wireless charging system realizes the calculation of the resonance parameters of the wireless charging system.
In one example, the equivalent inductance L of the step-down transformer lead-in system is calculatedTThe method also comprises the following steps:
determiningStep-down transformer parameters, primary side coil L in primary side compensation networkpParameter, secondary side coil L in secondary side compensation networksParameter, primary side coil LpAnd secondary side coil LsAnd a resonant frequency f of the wireless charging system. Wherein the step-down transformer parameter is specifically equivalent resistance R of a step-down transformer lead-in systemTPrimary side leakage inductance L of step-down transformers1Secondary side leakage inductance L of step-down transformers2And the exciting inductance L of the step-down transformerm(ii) a Primary side coil LpParameter, i.e. its inductance, secondary side coil LsThe parameter, i.e. its sensitivity value, let L in this examplep＝Ls。
In one example, the resonance parameter compensation method of the present invention further includes:
determining the compensation inductance L according to the resonance condition of the primary side compensation network1And a compensation capacitor C1And a compensation capacitor CpAnd (4) parameters. Specifically, the resonance condition of the primary-side compensation network satisfies:
wherein, ω is0Representing the resonant angular frequency, omega, of a wireless charging system0＝2πf。
In one example, the resonance parameter compensation method of the present invention further includes: determining the compensation inductance L according to the resonance condition of the secondary side compensation network2And a compensation capacitor C2And a compensation capacitor CsAnd (4) parameters. Specifically, the resonance condition of the secondary side compensation network satisfies:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system.
As a preferred example of the resonance parameter compensation method of the present invention, as shown in fig. 5, the resonance parameter compensation method specifically includes the following steps:
s1: determining parameters of a step-down transformer, parameters of a compensation network coil and a resonant frequency f of a wireless charging system;
s2: determining the compensation inductance L according to the resonance condition of the primary side compensation network1And a compensation capacitor C1And a compensation capacitor CpA parameter;
s3: calculating equivalent inductance L of step-down transformer lead-in systemTAnd calculating the leakage inductance compensation capacitance CTThe capacity value of (c);
s4: determining the compensation inductance L according to the resonance condition of the secondary side compensation network2And a compensation capacitor C2And a compensation capacitor CsA parameter;
s5: verifying design parameters of the wireless charging system.
The above steps S1 to S4 refer to the steps of the resonance parameter compensation method of the preferred example of the wireless charging system, and now the step S5 of the present application is explained, and further the system performance and the design rationality of the resonance parameter compensation method of the present application are demonstrated. Specifically, in the present example, ANSYS simplex software is used to build a system simulation model, and system efficiencies under different charging currents are verified, and specific system simulation parameter values are shown in table 1:
TABLE 1 simulation parameter value-taking table
Taking 48V lithium battery charging as an example, the simulation result of the system output voltage and current is shown in table 2:
TABLE 2 simulation result table of output voltage and current of system
The results in table 2 show that as the charging current increases, the system efficiency gradually increases, and the parameter calculation method of the invention can realize high-efficiency wireless power transmission under the condition of low voltage and large current. Further onThe leakage inductance compensation capacitor C can be seen from the tableTThe efficiency of the rear system is higher than that of an uncompensated leakage inductance compensation capacitor C in a full power rangeTThe system efficiency is more than 1%, and the system efficiency is obviously improved.
Furthermore, in order to further explain the resonance influence of the buck transformer on the system, the leakage inductance compensation capacitor C is not introduced under the condition of the same circuit parametersTAnd introducing leakage inductance compensation capacitor CTComparing waveforms of output terminals of time-step-down transformers, wherein FIG. 6 shows a schematic diagram of a capacitor C without leakage inductance compensationTFig. 7 is a diagram of the output waveform of the step-down transformer with the leakage inductance compensation capacitor C introducedTIn fig. 6-7, the abscissa represents time (ms) and the ordinate represents the output voltage value (V) and the output current value (a) of the step-down transformer, and it can be seen that the leakage inductance compensation capacitor C is not introducedTIn the process, the voltage before voltage commutation is greatly reduced, and in practical application, the waveform firstly causes the reduction of the system efficiency; on the other hand, because of the existence of the step-down transformer, the voltage dip has the possibility of forming oscillation, which is a great hidden trouble for the safety of the system. Introducing leakage inductance compensation capacitor CTAnd then, amplitude reduction before commutation of output voltage of the blade transformer is eliminated, voltage output is stable, and system efficiency is high.
The above detailed description is for the purpose of describing the invention in detail, and it should not be construed that the detailed description is limited to the description, and it will be apparent to those skilled in the art that various modifications and substitutions can be made without departing from the spirit of the invention.
Claims (10)
1. The utility model provides a wireless charging system with transformer, its includes DC power supply, high frequency inverter circuit, once side compensation network, secondary side compensation network and the rectifier circuit that connects in order, its characterized in that: the system also comprises a step-down transformer, and a secondary side compensation network is connected with the rectifying circuit through the step-down transformer; secondary side compensation network series leakage inductance compensation capacitor CTFloor drainInductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTAnd (4) resonating.
2. The wireless charging system with transformer of claim 1, wherein: the primary side compensation network comprises a compensation inductor L1And a compensation capacitor C1And a compensation capacitor CpAnd a primary side coil LpThe secondary side compensation network comprises a secondary side coil Ls and a compensation capacitor CsAnd a compensation capacitor C2And a compensation inductor L2And leakage inductance compensation capacitor CT；
Compensation inductance L1Connected with the output end of the high-frequency inverter circuit and compensating the inductance L1The other end is connected with a compensation capacitor C1And a compensation capacitor CpCompensating capacitor C1The other end is connected to a high-frequency inverter circuit and a compensation capacitor CpThe other end and the primary side coil LpConnected, primary side coil LpCoupled with a secondary side coil Ls, one end of which is connected with a compensation capacitor CsCompensating capacitor CsThe other end is connected with a compensation capacitor C2And compensation inductance L2Compensating capacitor C2Connected to the other end of the secondary side coil Ls and compensating the inductance L2And leakage inductance compensation capacitor CTAnd (4) connecting.
3. A resonance parameter compensation method of a wireless charging system with a transformer is characterized in that: the wireless charging system with transformer as claimed in any one of the above claims 1-2, the method comprising:
calculating equivalent inductance L of step-down transformer lead-in systemT；
Leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTResonance according to equivalent inductance LTDetermining leakage inductance compensation capacitance CTThe capacity value of (c).
4. The resonance parameter compensation method of a wireless charging system with a transformer according to claim 3, wherein:equivalent inductance L of the step-down transformer lead-in systemTThe calculation formula of (2) is as follows:
RT+jωLT＝jωLs1+jωLm//(jωL′s2+R′L)
and L's2＝n2Ls2，R′L＝n2RL
Wherein R isTRepresenting the equivalent resistance of the step-down transformer lead-in system; j represents an imaginary symbol; ω represents the resonance angular frequency; l is a radical of an alcohols1Representing a leakage inductance of a primary side of the step-down transformer; l is a radical of an alcohols2Representing secondary side leakage inductance of the step-down transformer; l is a radical of an alcoholmRepresenting the excitation inductance of the step-down transformer; rLRepresenting a rectifying circuit and a load RoThe equivalent load of (2); n represents the step-down transformer transformation ratio.
5. The resonance parameter compensation method of a wireless charging system with a transformer according to claim 3, wherein: the leakage inductance compensation capacitor CTEquivalent inductance L with step-down transformer lead-in systemTThe resonance satisfies:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system.
6. The resonance parameter compensation method of a wireless charging system with a transformer according to claim 1, wherein: calculating the equivalent inductance L of the step-down transformer lead-in systemTThe method also comprises the following steps:
determining the parameters of the step-down transformer, the primary coil L in the primary compensation networkpParameter, secondary side coil L in secondary side compensation networksParameter, primary side coil LpAnd secondary side coil LsAnd the resonant frequency f of the wireless charging system.
7. A resonance parameter compensation method of a wireless charging system with a transformer is characterized by comprising the following steps: the wireless charging system with transformer of claim 2, wherein the method comprises the resonance parameter compensation method of any one of claims 4 to 6, and further comprises:
determining the compensation inductance L according to the resonance condition of the primary side compensation network1And a compensation capacitor C1And a compensation capacitor CpAnd (4) parameters.
8. The method of claim 7, wherein the method comprises: the resonance condition of the primary side compensation network meets the following conditions:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system.
9. The method of claim 7, wherein the method comprises: determining the compensation inductance L according to the resonance condition of the secondary side compensation network2And a compensation capacitor C2And a compensation capacitor CsAnd (4) parameters.
10. The resonance parameter compensation method of a wireless charging system with a transformer according to claim 9, wherein: the resonance condition of the secondary side compensation network meets the following conditions:
wherein, ω is0Representing the resonant angular frequency of the wireless charging system.
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| CN103219881A (en) * | 2013-04-01 | 2013-07-24 | 南京航空航天大学 | Capacity compensation circuit for sectional series connection of transformer |
| CN107579659A (en) * | 2017-08-31 | 2018-01-12 | 上海空间电源研究所 | Adapt to the constant current resonance type DC translation circuit and method of the high parasitic parameter of transformer |
| CN109130903A (en) * | 2018-08-29 | 2019-01-04 | 昆明理工大学 | A kind of low-pressure high-power wireless charging system of bilateral LCCL-T topology |
| CN110429720A (en) * | 2019-08-20 | 2019-11-08 | 南京航空航天大学 | A kind of induction type radio energy transmission system for realizing constant current constant voltage output switching |
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| CN103219881A (en) * | 2013-04-01 | 2013-07-24 | 南京航空航天大学 | Capacity compensation circuit for sectional series connection of transformer |
| CN107579659A (en) * | 2017-08-31 | 2018-01-12 | 上海空间电源研究所 | Adapt to the constant current resonance type DC translation circuit and method of the high parasitic parameter of transformer |
| CN109130903A (en) * | 2018-08-29 | 2019-01-04 | 昆明理工大学 | A kind of low-pressure high-power wireless charging system of bilateral LCCL-T topology |
| CN110429720A (en) * | 2019-08-20 | 2019-11-08 | 南京航空航天大学 | A kind of induction type radio energy transmission system for realizing constant current constant voltage output switching |
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