CN114784995B - 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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- CN114784995B CN114784995B CN202210359253.2A CN202210359253A CN114784995B CN 114784995 B CN114784995 B CN 114784995B CN 202210359253 A CN202210359253 A CN 202210359253A CN 114784995 B CN114784995 B CN 114784995B
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- 230000005669 field effect Effects 0.000 description 9
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Classifications
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Dc-Dc Converters (AREA)
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 connected in sequence, and also 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 C T Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance. According to the invention, the step-down transformer is introduced before the rectifying circuit, so that the low-voltage 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 network T The influence of the system leading-in step-down transformer on the system resonance can be counteracted, so that the system works in a resonance state, and 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 intelligent home, 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 comprises transmission modes such as electromagnetic induction type, magnetic coupling resonance type, radio frequency microwave type, ultrasonic transduction type, laser type and the like, wherein the magnetic coupling resonance type is widely applied due to the advantages of high transmission efficiency, strong anti-offset characteristic and the like in high-power wireless power transmission occasions.
The existing wireless charging system mainly comprises a direct current power supply, a high-frequency inverter circuit, a compensation network and a rectifying circuit which are sequentially connected, wherein the compensation network is directly connected with a full-bridge rectifying module and is used for converting alternating current into direct current to be supplied to a load; on the other hand, the charging efficiency is a factor that is not negligible for the system design as a key performance index of the wireless charging system. The improvement of the charging efficiency of the wireless charging system is particularly difficult when the charging efficiency reaches 90% after the efficiency reaches a certain threshold. In summary, how to realize high-efficiency low-voltage high-current output in a wireless charging system is a technical problem to be solved in the art.
Disclosure of Invention
The invention aims to solve the problem that the existing wireless charging system cannot output low-voltage large current efficiently, and provides a wireless charging system with a transformer and a resonance parameter compensation method thereof.
The aim of the invention is realized by the following technical scheme: the wireless charging system with the transformer comprises a direct current power supply, a high-frequency inverter circuit, a primary side compensation network, a secondary side compensation network and a rectifying circuit which are connected in sequence, and further comprises a step-down transformer, wherein the 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 C T Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance.
In one example, the primary side compensation network includes a compensation inductance L 1 Compensating capacitor C 1 Compensating capacitor C p And primary side coil L p The secondary side compensation network comprises a secondary side coil Ls and a compensation capacitor C s Compensating capacitor C 2 Compensating inductance L 2 And leakage inductance compensation capacitor C T ；
Compensating inductance L 1 Is connected with the output end of the high-frequency inverter circuit to compensate the inductance L 1 The other end is connected with a compensation capacitor C 1 And compensating capacitor C p Compensating capacitor C 1 The other end is connected to the high-frequency inverter circuit and the compensation capacitor C p The other end and the primary side coil L p Connection, primary side coil L p Coupled with the secondary coil Ls, one end of the secondary coil Ls is connected with a compensation capacitor C s Compensating capacitor C s The other end is connected with a compensation capacitor C 2 And compensating inductance L 2 Compensating capacitor C 2 Connected to the other end of the secondary coil Ls, compensating inductance L 2 And leakage inductance compensation capacitor C T And (5) connection.
It should be further noted that the technical features corresponding to the examples above may be combined with each other or replaced to form a new technical solution.
The invention also comprises 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 combining any one or a plurality of examples, and the method comprises the following steps:
calculating the equivalent inductance L of a step-down transformer lead-in system T ；
Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance according to equivalent inductance L T Determining leakage inductance compensation capacitance C T Is a capacitance value of (2).
In one example, the step-down transformer introduces an equivalent inductance L into the system T The calculation formula of (2) is as follows:
R T +jωL T ＝jωL s1 +jωL m //(jωL′ s2 +R′ L )
and L' s2 ＝n 2 L s2 ，R′ L ＝n 2 R L
Wherein R is T Representing the equivalent resistance of the step-down transformer lead-in system; j represents an imaginary symbol; ω represents the resonant angular frequency; l (L) s1 Representing the primary side leakage inductance of the step-down transformer; l (L) s2 Representing secondary side leakage inductance of the step-down transformer; l (L) m Representing the excitation inductance of the step-down transformer; r is R L Representing a rectifying circuit and a load R o Equivalent load of (2); n represents the step-down transformer transformation ratio.
In one example, the leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T The resonance satisfies:
wherein omega 0 Representing the resonant angular frequency of the wireless charging system.
In one placeIn an example, the equivalent inductance L of the step-down transformer lead-in system is calculated T The method further comprises the following steps:
determining parameters of a step-down transformer, primary side coil L in a primary side compensation network p Parameter, secondary side coil L in secondary side compensation network s Parameter, primary side coil L p And a secondary side coil L s And the resonant frequency f of the wireless charging system.
In an example, the resonance parameter compensation method further includes:
determining the compensation inductance L according to the resonance condition of the primary side compensation network 1 Compensating capacitor C 1 Compensating capacitor C p Parameters.
In an example, the resonance condition of the primary-side compensation network satisfies:
wherein omega 0 Representing the resonant angular frequency of the wireless charging system.
In one example, the compensation inductance L is determined according to the resonance condition of the secondary side compensation network 2 Compensating capacitor C 2 Compensating capacitor C s Parameters.
In an example, the resonance condition of the secondary side compensation network satisfies:
wherein omega 0 Representing the resonant angular frequency of the wireless charging system.
It should be further noted that the technical features corresponding to the examples above may 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, the invention introduces a step-down transformer before the rectifying circuit to realize the low voltage of the systemThe high-current output meets the high-current charging requirement; leakage inductance compensation capacitor C connected in series with secondary side compensation network T The influence of the system leading-in step-down transformer 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 the step-down transformer lead-in system T And leakage inductance compensation capacitor C T Can determine the leakage inductance compensation capacitance C T To offset the equivalent inductance of the step-down transformer, and to realize the rapid calculation of the system resonance parameters.
(3) In an example, the invention can further determine each compensation capacitance and compensation inductance parameter in the compensation network according to the resonance condition of the compensation network, so as to realize the rapid calculation of the system resonance parameter.
Drawings
The following detailed description of the present invention is further detailed in conjunction with the accompanying drawings, which are provided to provide a further understanding of the present application, and in which like reference numerals are used to designate like or similar parts throughout the several views, and in which the illustrative examples and descriptions thereof are used to explain the present application and are not meant to be unduly limiting.
FIG. 1 is a block diagram of a system circuit in an example of the invention;
FIG. 2 is a circuit diagram of a system in an example of the invention;
FIG. 3 is a flow chart of a method in an example of the invention;
FIG. 4 is a diagram of an equivalent circuit of a system in an 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 capacitors in an example of the present invention;
fig. 7 is a waveform diagram of the output of a step-down transformer incorporating leakage inductance compensation capacitors in an example of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully understood from the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that directions or positional relationships indicated as being "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are directions or positional relationships described based on the drawings are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements to be 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," "second," and the like 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 explicitly specified and limited otherwise, 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; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
The invention aims to provide a wireless charging system for realizing high-efficiency low-voltage high-current output, in an example, as shown in fig. 1, the wireless charging system specifically comprises a direct-current power supply, a high-frequency inverter circuit, a primary side compensation network, a secondary side compensation network and a rectifying 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 the secondary side compensation network is reducedThe voltage transformer is connected with the rectifying circuit; the secondary side compensation network is connected in series with a leakage inductance compensation capacitor C T Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance. Specifically, the direct current power supply is a system input direct current power supply, the direct current power supply 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 steps down the alternating current and transmits the alternating current to a rectifying circuit, and the rectifying circuit further converts the alternating current into direct current and outputs the direct current. In the example, a step-down transformer is introduced before a rectifying circuit, so that low-voltage output can be realized, and in theory, the primary side power (input end power) and the secondary side power (output end power) of the step-down transformer are equal, and as the secondary side voltage is reduced, the secondary side current is obviously increased, and therefore, 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 network T Equivalent inductance L of leading-in system of step-down transformer T Resonance, compensating capacitor C by leakage inductance T Equivalent inductance L of cancellation step-down transformer lead-in system T 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, which have the same two circuit structures and are connected in parallel, each of the half-bridge inverter circuits includes an upper half-bridge arm and a lower half-bridge arm connected in series, and the upper half-bridge arm and the lower half-bridge arm have the same circuit structure and are both switching devices, such as field effect transistors. 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, and the common connection point of the upper half bridge arm and the lower half bridge arm in the first half bridge inverter circuit is inputAnd outputting the voltage signal of one half-bridge inverter circuit to a compensation network, and outputting the voltage signal of the other half-bridge inverter circuit to the compensation network at the common connection point of the upper half-bridge arm and the lower half-bridge arm in the half-bridge inverter circuit. As an option, each field effect transistor in the half-bridge inverter circuit is connected in parallel with an RCD absorption circuit for absorbing voltage spikes when the field effect transistor is turned on or off. The RCD absorption circuit comprises a freewheeling diode, a first capacitor and a first inductor, wherein the freewheeling diode is connected in series with the first capacitor and is connected between the source electrode and the drain electrode of the field effect transistor in parallel, 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 rectifying circuit is a full-bridge rectifying circuit, and the output end of the full-bridge rectifying circuit is connected in parallel with a filter capacitor C o To output a stable dc voltage.
In one example, as shown in FIG. 2, the primary side compensation network includes a compensation inductance L 1 Compensating capacitor C 1 Compensating capacitor C p And primary side coil L p The secondary side compensation network comprises a secondary side coil Ls and a compensation capacitor C s Compensating capacitor C 2 Compensating inductance L 2 And leakage inductance compensation capacitor C T The method comprises the steps of carrying out a first treatment on the surface of the Compensating inductance L 1 Is connected with the output end of a first half-bridge inverter circuit in the high-frequency inverter circuit to compensate the inductance L 1 The other end is connected with a compensation capacitor C 1 And compensating capacitor C p Compensating capacitor C 1 The other end is connected to the output end of the first half-bridge inverter circuit in the high-frequency inverter circuit, and the compensation capacitor C p The other end and the primary side coil L p Connection, primary side coil L p Coupled with the secondary coil Ls, one end of the secondary coil Ls is connected with a compensation capacitor C s Compensating capacitor C s The other end is connected with a compensation capacitor C 2 And compensating inductance L 2 Compensating capacitor C 2 Connected to the other end of the secondary coil Ls, compensating inductance L 2 And leakage inductance compensation capacitor C T Connected with leakage inductance compensation capacitor C T Is connected to the primary side coil of the step-down transformer, the secondary side coil of the step-down transformer is coupled with the primary side coil of the step-down transformerThe turns ratio of the primary coil to the secondary coil is n:1. in this example, the high-frequency square wave ac reaches the primary coil Lp through the primary compensation network, and the primary coil Lp transmits the electric energy to the secondary coil Ls through resonance coupling, so that the compensation network can make the system work in a resonance state, counteract the high impedance influence of the transmission coil, and ensure high-efficiency electric energy transmission.
In an example, the present invention further includes a method for compensating resonance parameters of a wireless charging system with a transformer, which is applied to the above-described preferred example, i.e., the wireless charging system with a transformer shown in fig. 2, as shown in fig. 4, the method includes:
calculating the equivalent inductance L of a step-down transformer lead-in system T ；
Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance according to equivalent inductance L T Determining leakage inductance compensation capacitance C T Is a capacitance value of (2).
Further, to facilitate calculation of leakage inductance compensation capacitance C T The wireless charging system of the preferred example shown in fig. 2 is equivalent to the equivalent circuit shown in fig. 4 based on the leakage inductance equivalent model of the step-down transformer, wherein the full-bridge rectifying circuit and the load R o Equivalent to load R L ，L s1 Representing the primary side leakage inductance of the step-down transformer; l (L) s2 Representing secondary side leakage inductance of the step-down transformer; l (L) m Representing the exciting inductance of the step-down transformer; the equivalent leakage inductance and load of the secondary side of the transformer are expressed as L' s2 ＝n 2 L s2 ，R′ L ＝n 2 R L N is the transformer transformation ratio, i.e. the turns ratio of the primary winding to the secondary winding.
In one example, as can be seen from the equivalent circuit diagram of the leakage inductance model of the step-down transformer in FIG. 4, the step-down transformer introduces an equivalent inductance L into the system T The calculation formula of (2) is as follows:
R T +jωL T ＝jωL s1 +jωL m //(jωL′ s2 +R′ L )
wherein R is T Representing the equivalent resistance of the step-down transformer lead-in system; j represents an imaginary symbol; omega represents leakage inductance compensation capacitance C T Equivalent inductance L of leading-in system of step-down transformer T Resonant angular frequency.
At this time, leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T The resonance is as follows:
wherein omega 0 Representing the resonant angular frequency of the wireless charging system. Based on this, according to the equivalent inductance L T Determining leakage inductance compensation capacitance C T The capacitance of the wireless charging system is calculated.
In one example, the equivalent inductance L of the step-down transformer lead-in system is calculated T The method further comprises the following steps:
determining parameters of a step-down transformer, primary side coil L in a primary side compensation network p Parameter, secondary side coil L in secondary side compensation network s Parameter, primary side coil L p And a secondary side coil L s And the resonant frequency f of the wireless charging system. Wherein the parameters of the step-down transformer are specifically the equivalent resistance R of the step-down transformer leading-in system T Primary side leakage inductance L of step-down transformer s1 Secondary side leakage inductance L of step-down transformer s2 Exciting inductance L of step-down transformer m The method comprises the steps of carrying out a first treatment on the surface of the Primary side coil L p The parameter is its inductance value, the secondary coil L s The parameter, i.e. its inductance, let L in this example p ＝L s 。
In an 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 network 1 Compensating capacitor C 1 Compensating capacitor C p Parameters. Specifically, the resonance condition of the primary-side compensation network satisfies:
wherein omega 0 Representing the resonant angular frequency, ω, of a wireless charging system 0 ＝2πf。
In an 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 network 2 Compensating capacitor C 2 Compensating capacitor C s Parameters. Specifically, the resonance condition of the secondary side compensation network satisfies:
wherein omega 0 Representing 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 steps of:
s1: determining parameters of a step-down transformer, parameters of a compensation network coil and a resonance frequency f of a wireless charging system;
s2: determining the compensation inductance L according to the resonance condition of the primary side compensation network 1 Compensating capacitor C 1 Compensating capacitor C p Parameters;
s3: calculating the equivalent inductance L of a step-down transformer lead-in system T And calculates leakage inductance compensation capacitance C T Is a capacitance value of (2);
s4: determining the compensation inductance L according to the resonance condition of the secondary side compensation network 2 Compensating capacitor C 2 Compensating capacitor C s Parameters;
s5: and verifying design parameters of the wireless charging system.
The steps S1-S4 refer to the steps of the resonant parameter compensation method of the preferred example of the wireless charging system, and the step S5 of the present application will now be described, so as to demonstrate the system performance and the design rationality of the resonant parameter compensation method of the present application. Specifically, the system simulation model is built by adopting ANSYS simple software in the example, the system efficiency under the charging currents with different magnitudes is verified, and the specific system simulation parameter values are shown in the table 1:
table 1 simulation parameter value table
Taking 48V lithium battery charging as an example, the simulation results of the system output voltage and current are shown in Table 2:
table 2 simulation result table of output voltage and current of system
The results of table 2 show that as the charging current increases and the system efficiency gradually increases, the parameter calculation method of the invention can realize high-efficiency wireless power transmission under the condition of low voltage and high current. Further, it can be seen from the table that the leakage inductance compensation capacitance C is compensated T The efficiency of the rear system is higher than that of the uncompensated leakage inductance compensation capacitor C in the full power range T The system efficiency is higher than 1%, and the system efficiency is obviously improved.
Further, to further illustrate the resonance effect of the step-down transformer on the system, no leakage inductance compensation capacitor C is introduced under the same circuit parameters T And introducing leakage inductance compensation capacitor C T Waveform comparison of output end of time-step-down transformer, wherein FIG. 6 shows that leakage inductance compensation capacitor C is not introduced T Fig. 7 is a waveform diagram of the output of the step-down transformer, in which a leakage inductance compensation capacitor C is introduced T In fig. 6 to 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, it can be seen that the leakage inductance compensation capacitor C is not introduced T When the voltage before voltage change is greatly reduced, in practical application, such waveform will first cause the reduction of system efficiency; on the other hand due to voltage reduction and transformationThe existence of the device, the voltage dip has the possibility of forming oscillation, and the safety of the system is a great hidden danger. Introducing leakage inductance compensation capacitor C T And after that, the amplitude reduction before the commutation of the output voltage of the blade transformer is eliminated, the voltage output is stable, and the system efficiency is high.
The foregoing detailed description of the invention is provided for illustration, and it is not to be construed that the detailed description of the invention is limited to only those illustration, but that several simple deductions and substitutions can be made by those skilled in the art without departing from the spirit of the invention, and are to be considered as falling within the scope of the invention.
Claims (6)
1. The resonance parameter compensation method of the wireless charging system with the transformer is implemented based on the wireless charging system with the transformer, and 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 rectifying circuit which are sequentially connected, and is characterized in that: the system also comprises a step-down transformer, and 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 C T Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance;
the primary side compensation network comprises a compensation inductance L 1 Compensating capacitor C 1 Compensating capacitor C p And primary side coil L p The secondary side compensation network comprises a secondary side coil Ls and a compensation capacitor C s Compensating capacitor C 2 Compensating inductance L 2 And leakage inductance compensation capacitor C T ；
Compensating inductance L 1 Is connected with the output end of the high-frequency inverter circuit to compensate the inductance L 1 The other end is connected with a compensation capacitor C 1 And compensating capacitor C p Compensating capacitor C 1 The other end is connected to the high-frequency inverter circuit and the compensation capacitor C p The other end and the primary side coil L p Connection, primary side coil L p Coupled with the secondary coil Ls, one end of the secondary coil Ls is connected with a compensation capacitor C s Compensation ofCapacitor C s The other end is connected with a compensation capacitor C 2 And compensating inductance L 2 Compensating capacitor C 2 Connected to the other end of the secondary coil Ls, compensating inductance L 2 And leakage inductance compensation capacitor C T Connecting;
the method comprises the following steps:
calculating the equivalent inductance L of a step-down transformer lead-in system T ；
Leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T Resonance according to equivalent inductance L T Determining leakage inductance compensation capacitance C T Is a capacitance value of (2);
equivalent inductance L of the step-down transformer lead-in system T The calculation formula of (2) is as follows:
；
and is also provided with ，/> ，/> ；
Wherein R is T Representing the equivalent resistance of the step-down transformer lead-in system;representing an imaginary symbol; />Representing the resonant angular frequency;representing the primary side leakage inductance of the step-down transformer; />Representing secondary side leakage inductance of the step-down transformer; />Representing the excitation inductance of the step-down transformer; />Representing a rectifying circuit and a load R o Equivalent load of (2);nrepresenting the step-down transformer transformation ratio;
the leakage inductance compensation capacitor C T Equivalent inductance L of leading-in system of step-down transformer T The resonance satisfies:
；
wherein,representing the resonant angular frequency of the wireless charging system.
2. The method for compensating resonance parameters of a wireless charging system with a transformer according to claim 1, wherein: equivalent inductance L of the introduction system of the calculation step-down transformer T The method further comprises the following steps:
determining parameters of a step-down transformer, primary side coil L in a primary side compensation network p Parameter, secondary side coil L in secondary side compensation network s Parameter, primary side coil L p And a secondary side coil L s The coupling coefficient k of the wireless charging system and the resonant frequency of the wireless charging systemf。
3. The method for compensating resonance parameters of a wireless charging system with a transformer according to claim 1, wherein: the method further comprises the steps of:
determining the compensation inductance L according to the resonance condition of the primary side compensation network 1 Compensating capacitor C 1 Compensating capacitor C p Parameters.
4. A method of compensating for resonance parameters of a wireless charging system with a transformer as claimed in claim 3, wherein: the resonance condition of the primary side compensation network satisfies:
；
wherein,representing the resonant angular frequency of the wireless charging system.
5. A method of compensating for resonance parameters of a wireless charging system with a transformer as claimed in claim 3, wherein: determining the compensation inductance L according to the resonance condition of the secondary side compensation network 2 Compensating capacitor C 2 Compensating capacitor C s Parameters.
6. The method for compensating resonance parameters of a wireless charging system with a transformer according to claim 5, wherein: the resonance condition of the secondary side compensation network satisfies:
；
wherein,representing 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 |
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