CN115986951A - Wireless charging system with zero phase angle constant current and constant voltage output characteristics and parameter design method - Google Patents
Wireless charging system with zero phase angle constant current and constant voltage output characteristics and parameter design method Download PDFInfo
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
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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
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Abstract
The invention provides a wireless charging system with zero phase angle constant current and constant voltage output characteristics and a parameter design method DC Inverter bridge, primary side compensation network and transmitting coil L p2 And a receiving coil L' s1 The secondary side compensation network, the rectifier bridge and the load resistor R; the DC voltage source U DC Connecting an inverter bridge, the inverter bridge, a primary side compensation network and a transmitting coil L p2 Are connected, the transmitting coil L p2 And a receiving coil L' s1 Mutual inductance of the receiving coil L' s1 The secondary side compensation network is connected with a rectifier bridge, and the rectifier bridge is connected with a load resistor R; the invention realizes the switching of the two fixed working frequencies under the condition of variable coupling coefficientThe current constant current/constant voltage working mode is switched, and both working modes meet a zero phase angle. In addition, the compensation topology suppresses higher harmonics of the rectifying unit, so that the output current and voltage values of the system are more stable.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a wireless charging system with zero phase angle constant current and constant voltage output characteristics and a parameter design method.
Background
At present, most electric equipment is powered by lithium batteries or lead storage batteries, the charging of the load needs a constant-current and constant-voltage charging mode, and the charging voltage or current cannot fluctuate greatly along with the change of the load. At present, three methods for realizing constant current/constant voltage output of a wireless power transmission system are provided. The method comprises the following steps: constant current/constant voltage output is realized by a method of adjusting the working frequency of the system; the second method comprises the following steps: constant current/constant voltage output is realized by switching a topological structure through a switch; the third method comprises the following steps: constant current/constant voltage output is realized by a method of adding a control circuit.
However, three methods for realizing constant current/constant voltage output in the existing wireless power transmission research have certain defects. The method comprises the following steps: the existing mode of changing the working frequency of a wireless charging system can only realize constant current/constant voltage output under the condition of fixing a coupling coefficient and meet a zero phase angle, when the coupling coefficient changes, the system only has constant current output characteristics or constant voltage output characteristics, even part of the system does not have the constant current output characteristics or the constant voltage output characteristics, and certain difficulty exists in practical application. The second method comprises the following steps: the system complexity is increased by switching the topological structure through the switch, certain loss can be brought by the introduction of the switch, the improvement of the system efficiency is not facilitated, and in a high-power wireless power supply system, great temperature rise can be brought to devices by the loss, and the heat dissipation problem of the devices is introduced. The third method comprises the following steps: the introduction of the control circuit also increases the complexity of the system, brings certain loss, and also has the problem of overhigh temperature rise of devices in high-power application. In addition, the requirement of the third method on the control circuit is higher, for the same topological structure, when the excitation frequency is not changed, the wireless power supply system only has constant-current or constant-voltage output characteristics and only has a zero phase angle in one output state, when the system needs to work in the constant-current and constant-voltage output states, one output mode is completely realized by the control circuit, and when the coupling coefficient or the load change range is larger, the adjustable range of the control circuit needs to be wider, and even the situation that the adjustable range of the control circuit is exceeded can occur. Therefore, a wireless charging topological structure with zero phase angle constant current/constant voltage output characteristics and a parameter design method are urgently needed, so that the system can realize constant current/constant voltage working mode conversion only through switching of two fixed frequencies under the condition of variable coupling coefficients, and both the two working modes meet the zero phase angle.
Disclosure of Invention
The invention provides a wireless charging system with zero phase angle constant current and constant voltage output characteristics and a parameter design method, aiming at solving the problem that loads such as lithium batteries, lead storage batteries and the like in a wireless electric energy transmission system need to be switched between two charging processes of constant current and constant voltage; under the condition of variable coupling coefficient, the switching of the constant-current/constant-voltage working modes is realized only by switching two fixed working frequencies, and the two working modes both meet the zero phase angle.
The invention is realized by the following scheme:
a secondary side circuit of a wireless charging system with zero phase angle constant current and constant voltage output characteristics:
the secondary circuit comprises a receiving coil L s1 First compensation network Z s1 Secondary side compensation inductance L s2 Secondary side compensation capacitor C s1 、C s2 And C s3 Second compensation network Z D0 A rectifier unit and a load resistor R;
the receiving coil L s1 One end and secondary side compensation capacitor C s1 Is connected with the secondary side compensating capacitor C s1 And the other end of the first compensation network Z s1 Is connected to one end of a first compensation network Z s1 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s2 One end of and the secondary side compensation inductance L s2 One end of the two ends are connected;
secondary side compensation inductance L s2 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s3 Is connected to the rectifying unit, a receiving coil L s1 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s2 The other end and the secondary side compensation capacitor C s3 The other ends of the two are connected; the rectifying unit is connected with a load resistor R.
Further, the air conditioner is provided with a fan,
the first compensation network Z s1 Including a secondary compensation inductance L s0 And secondary side compensation capacitor C s0 (ii) a The secondary compensation inductance L s0 And secondary side compensation capacitor C s0 Are connected in series;
the second compensation network Z D0 Including a secondary compensation inductance L D0 And secondary side adjustable capacitor C D0_X (ii) a The secondary side compensation inductor L D0 And secondary side adjustable capacitor C D0_X Are connected in series.
Further, the air conditioner is provided with a fan,
the secondary side compensation inductor L s2 Comprises n compensation sub-inductors L s2_n 。
A wireless charging system with zero phase angle constant current and constant voltage output characteristics:
the wireless charging system comprises a primary side circuit and a secondary side circuit,
the primary circuit comprises a DC voltage source U DC Inversion unit, primary side compensation network and transmitting coil L p2 ；
The secondary side circuit is the secondary side circuit;
the DC voltage source U DC Connected with an inversion unit, the inversion unit, a primary side compensation network and a transmitting coil L p2 Are connected, the transmitting coil L p2 And a receiving coil L s1 And (5) mutual inductance.
Further, the air conditioner is characterized in that,
the primary side compensation network is a PS compensation structure;
the PS compensation structure comprises a primary side compensation inductor L p1 Primary side compensation capacitor C p1 And C p2 ；
In the primary side compensation network, a primary side compensation inductance L p1 And primary side compensation capacitor C p1 Form a parallel branch and a primary side compensation capacitor C p2 And a transmitting coil L p2 And forming a series branch, wherein the parallel branch and the series branch are connected in series.
Further, the air conditioner is provided with a fan,
the inversion unit comprises four switching tubes Q 1 、Q 2 、Q 3 And Q 4 ；
The DC voltage source U DC Respectively with the positive pole of the switch tube Q 1 And Q 2 Is connected with each other;
switch tube Q 1 The other end of the first and second switches are respectively connected with a switch tube Q 3 And primary side transmitting coil L p2 One end of the two ends are connected;
switch tube Q 2 And the other end of the switch tube Q 4 Primary side compensation inductance L p1 One terminal of (C) and primary side compensation capacitor C p1 One end of the two ends are connected;
DC voltage source U DC Respectively with the switching tube Q 3 And Q 4 The other ends of the two are connected;
primary side compensation capacitor C p2 One end of which is respectively connected with the primary side compensation inductance L p1 And the other end of the primary side compensation capacitor C p1 The other ends of the two are connected;
primary side compensation capacitor C p2 And the other end of the transmitting coil L p2 The other ends of the two are connected.
Further, the air conditioner is provided with a fan,
the rectifying unit comprises four diodes D 1 、D 2 、D 3 、D 4 And a capacitor C 0 ；
One end of the load resistor R is respectively connected with the capacitor C 0 One terminal of (1), diode D 1 And diode D 2 The negative electrodes are connected;
diode D 1 Respectively connected with a diode D 3 Negative electrode of (1) and secondary side adjustable capacitor C D0_X ；
The other end of the load resistor R is respectively connected with the capacitor C 0 Another terminal of (1), diode D 3 Anode and diode D 4 The positive electrodes of the two electrodes are connected;
dipolar bodyPipe D 2 Respectively connected with a diode D 4 Negative electrode and secondary side compensation capacitor C s3 Secondary side compensating capacitor C s2 And a receiving coil L s1 。
A parameter design method of a wireless charging system with zero phase angle constant current and constant voltage output characteristics comprises the following steps:
the parameter design method specifically comprises the following steps:
step 1: under the condition of variable coupling coefficient, a topological structure with constant-current and constant-voltage output characteristics is constructed;
and 2, step: when the topological structure has constant current output characteristic, the transmitting coil L p2 Primary side compensation inductance L p1 Primary side compensation capacitor C p1 And C p2 Secondary side compensation inductance L s2_1 And L s2_2 Secondary side compensating capacitor C s2 And C s3 The satisfied relational expression is:
wherein, ω is CC The angular frequency is corresponding to the constant current mode; j is an imaginary symbol;
and step 3: when the topology has a constant voltage output characteristic, the transmitting coil L p2 Primary side compensation inductance L p1 Primary side compensation capacitor C p1 And C p2 Secondary side compensation inductance L s2_1 And L s2_2 Secondary side compensating capacitor C s2 The satisfied relational expression is:
wherein, ω is CV The angular frequency is corresponding to the constant voltage mode;
and 4, step 4: solving based on the relational expression in the step 2 and the step 3 to obtain the working angular frequency omega when the system works in the constant-current mode and the constant-voltage mode respectively CV And omega CC ：
Wherein: lambda p Is the ratio of the capacitance of the primary side,
L p2 ＝(1+λ p )L p1 ；
and 5: when the system is operated in a constant voltage mode and has a zero phase angle output characteristic, the receiving coil L s1 Secondary side compensation inductance L s2_1 And L s2_2 And a secondary side compensation capacitor C s1 And C s3 The relation to be satisfied is:
step 6: compensating capacitor C on the secondary side s1 、C s2 A compensation inductor L connected in series is added between s0 And a compensation capacitor C s0 Compensating the secondary side circuit to compensate the inductance L s0 And a compensation capacitor C s0 Secondary input impedance Z s1 The relations are respectively:
and 7: let Z in step 6 s1 =0, to obtain the compensation inductance L s0 And a compensation capacitor C s0 The relation is as follows:
and step 8: the system is added in the rectifying unit to introduce higher harmonic wave, and a series compensation inductor L is added in front of the rectifying unit D0 And an adjustable capacitor C D0_X The system can adjust the capacitance C under the constant current and constant voltage working modes D0_X Respectively as follows:
wherein C D0_CC Adjustable capacitor C for system in constant current working mode D0_X Relation of (a), C D0_CV Adjustable capacitor C for system under constant voltage working mode D0_X The relational expression of (1);
and step 9: merging of identical devices in the same branch, i.e. L s0 And L s1 Are combined into L' s1 、C s0 And C s1 Are combined to be C' s1 、L s2_1 And L s2_2 Are combined into L s2 ：
L′ s1 ＝L s1 +L s0_1
L s2 ＝L s2_1 +L s2_2 ；
Step 10: the corresponding input voltage values of the system in two stages of constant current and constant voltage at the same coupling coefficient are the same, and the relation required to be satisfied is as follows:
wherein: i is CC And U CV Respectively a load constant current charging current and a constant voltage charging voltage.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of the method when the processor executes the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of the above-described method.
The invention has the beneficial effects
(1) According to the invention, through the construction of a topological structure and the setting of a parameter relation, the switching of a constant-current/constant-voltage working mode is realized only through the switching of two fixed working frequencies under the condition of a variable coupling coefficient, and the two working modes both meet a zero phase angle;
(2) In order to inhibit the influence of higher harmonics caused by the rectifying unit on a wireless electric energy system, the invention also inhibits the higher harmonics in a topological compensation mode, thereby improving the stability of constant-current and constant-voltage output values of the system;
(3) Compared with the existing method for realizing the switching of the constant current/constant voltage modes, the method does not need to introduce a switch for switching the topological structure, does not need to introduce a complex control circuit, eliminates the problems of power loss and device heat dissipation of a selector switch, the control circuit and the like, can realize the switching of the two constant current/constant voltage working modes only through the switching of two fixed working frequencies, and improves the transmission efficiency of a parameter optimization system.
Drawings
FIG. 1 is a schematic circuit diagram of a wireless charging topology with zero phase angle constant current/constant voltage output characteristics according to the present invention;
fig. 2 is a schematic diagram of a circuit having a constant current/constant voltage output characteristic according to an embodiment of the present invention;
FIG. 3 is a circuit schematic of a secondary side add compensation topology according to one embodiment of the present invention;
FIG. 4 illustrates a topology compensation for suppressing higher harmonics in a rectification unit according to an embodiment of the present invention;
FIG. 5 is a graph of transconductance gain and voltage gain as a function of load and coupling factor for an embodiment of the present invention, wherein (a) transconductance gain; (b) a voltage gain;
FIG. 6 is a graph of input impedance angle as a function of load, coupling coefficient for one embodiment of the present invention, wherein (a) constant current mode; (b) a constant voltage mode;
FIG. 7 shows the system transmission efficiency as a function of load for a variable coupling coefficient according to an embodiment of the present invention, wherein (a) in constant current mode; (b) constant voltage mode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious 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 conjunction with the figures 1 to 7,
referring to fig. 1, a secondary circuit of a wireless charging system with zero phase angle constant current and constant voltage output characteristics:
the secondary circuit comprises a receiving coil L s1 First compensation network Z s1 Secondary side compensation inductance L s2 Secondary side compensation capacitor C s1 、C s2 And C s3 Second compensation network Z D0 A rectifier unit and a load resistor R;
the receiving coil L s1 One end of and the secondary side of the compensating capacitor C s1 Is connected with one end of the secondary side compensating capacitor C s1 And the other end of the first compensation network Z s1 Is connected to one end of a first compensation network Z s1 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s2 One end of and the secondary side compensation inductance L s2 One end of the two ends are connected;
secondary side compensation inductance L s2 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s3 Is connected to the rectifying unit, a receiving coil L s1 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s2 The other end and the secondary side compensation capacitor C s3 The other ends of the two are connected; the rectifying unit is connected with a load resistorR。
The first compensation network Z s1 Including a secondary compensation inductance L s0 And secondary side compensation capacitor C s0 (ii) a The secondary compensation inductance L s0 And secondary side compensation capacitor C s0 Are connected in series;
said second compensation network Z D0 Including a secondary compensation inductance L D0 And secondary side adjustable capacitor C D0_X (ii) a The secondary compensation inductance L D0 And secondary side adjustable capacitor C D0_X Are connected in series.
The secondary compensation inductance L s2 Comprises n compensation sub-inductors L s2_n 。
A wireless charging system with zero phase angle constant current and constant voltage output characteristics:
the wireless charging system comprises a primary side circuit and a secondary side circuit,
the primary circuit comprises a DC voltage source U DC Inversion unit, primary side compensation network and transmitting coil L p2 ；
The secondary side circuit is the secondary side circuit;
the DC voltage source U DC Connected with an inversion unit, the inversion unit, a primary side compensation network and a transmitting coil L p2 Are connected, the transmitting coil L p2 And a receiving coil L s1 And (5) mutual inductance.
The primary side compensation network is a PS compensation structure;
the PS compensation structure comprises a primary side compensation inductor L p1 Primary side compensation capacitor C p1 And C p2 ；
In the primary side compensation network, a primary side compensation inductor L p1 And primary side compensation capacitor C p1 Form a parallel branch and a primary side compensation capacitor C p2 And a transmitting coil L p2 And forming a series branch, wherein the parallel branch and the series branch are connected in series.
The inversion unit comprises four switching tubes Q 1 、Q 2 、Q 3 And Q 4 ；
The DC voltage source U DC Respectively with the positive pole of the switching tube Q 1 And Q 2 One end of the two ends are connected;
switch tube Q 1 The other end of the first and second switches are respectively connected with a switch tube Q 3 And primary side transmitting coil L p2 One end of the two ends are connected;
switch tube Q 2 And the other end of the switch tube Q 4 Primary side compensation inductance L p1 One terminal of and primary side compensation capacitor C p1 One end of the two ends are connected;
DC voltage source U DC Respectively connected with a switch tube Q 3 And Q 4 The other ends of the two are connected;
primary side compensation capacitor C p2 One end of which is respectively connected with the primary side compensation inductance L p1 Another terminal of (1) and primary side compensation capacitor C p1 The other ends of the two are connected;
primary side compensation capacitor C p2 And the other end of the transmitting coil L p2 The other ends of the two are connected.
The rectifying unit comprises four diodes D 1 、D 2 、D 3 、D 4 And a capacitor C 0 ；
One end of the load resistor R is respectively connected with the capacitor C 0 One end of (1), diode D 1 And diode D 2 Is connected with the cathode;
diode D 1 Respectively connected with a diode D 3 Negative electrode of (2) and secondary side adjustable capacitor C D0_X ；
The other end of the load resistor R is respectively connected with the capacitor C 0 Another terminal of (1), diode D 3 Anode and diode D 4 The positive electrodes of the two electrodes are connected;
diode D 2 Respectively connected with a diode D 4 Negative pole and secondary side compensation capacitor C s3 Secondary side compensating capacitor C s2 And a receiving coil L s1 。
A parameter design method of a wireless charging system with zero phase angle constant current and constant voltage output characteristics comprises the following steps:
the parameter design method specifically comprises the following steps:
step 1: as shown in fig. 2, a topological structure with constant current and constant voltage output characteristics under the condition of variable coupling coefficient is constructed;
step 2: when the topological structure has constant current output characteristic, the transmitting coil L p2 Primary side compensation inductance L p1 Primary side compensation capacitor C p1 And C p2 Secondary side compensation inductance L s2_1 And L s2_2 Secondary side compensating capacitor C s2 And C s3 The satisfied relational expression is:
wherein, ω is CC The angular frequency is corresponding to the constant current mode; j is an imaginary symbol;
and step 3: when the topology has a constant voltage output characteristic, the transmitting coil L p2 Primary side compensation inductance L p1 Primary side compensation capacitor C p1 And C p2 Secondary side compensation inductance L s2_1 And L s2_2 Secondary side compensating capacitor C s2 The satisfied relational expression is:
wherein, ω is CV The angular frequency is corresponding to the constant voltage mode;
and 4, step 4: based on the solving of the relational expression in the step 2 and the step 3, the working angular frequency omega of the system respectively working in the constant current mode and the constant voltage mode is obtained CV And ω CC ：
Wherein: lambda [ alpha ] p Is the ratio of the capacitance of the primary side,
L p2 ＝(1+λ p )L p1 ；
through the setting of the system parameter relationship in the steps 2-4, the constructed topological structure has constant current/constant voltage output characteristics under the condition of variable coupling coefficient, but the system does not have zero phase angle output characteristics under two working modes;
and 5: when the system is operated in a constant voltage mode and has a zero phase angle output characteristic, the receiving coil L s1 Secondary side compensation inductance L s2_1 And L s2_2 And a secondary compensation capacitor C s1 And C s3 The relation to be satisfied is:
step 6: as shown in FIG. 3, the capacitor C is compensated at the secondary side without destroying the zero phase angle output characteristics of the system in constant current, constant voltage and constant voltage modes s1 、C s2 A compensation inductor L connected in series is added between the two s0 And a compensation capacitor C s0 The secondary side circuit is compensated, so that zero phase angle output is realized in a constant current mode, and the inductor L is compensated s0 And a compensation capacitor C s0 Secondary input impedance Z s1 The relations are respectively:
and 7: let Z in step 6 s1 =0, resulting in a compensated inductance L s0 And a compensation capacitor C s0 The relation is as follows:
and 8: a certain higher harmonic is introduced when the rectifying unit is added into the system, and in order to inhibit the influence of the higher harmonic on the output characteristic of the system, the higher harmonic is introduced, as shown in fig. 4, a series compensation inductor L is added in front of the rectifying unit D0 And an adjustable capacitor C D0_X The system can adjust the capacitance C under the constant current and constant voltage working modes D0_X Respectively as follows:
wherein C is D0_CC Adjustable capacitor C for system in constant current working mode D0_X Relation of (a), C D0_CV Adjustable capacitor C for system in constant voltage working mode D0_X The relational expression of (1);
and step 9: merging of identical devices in the same branch, i.e. L s0 And L s1 Are combined to be L' s1 、C s0 And C s1 Are combined to be C' s1 、L s2_1 And L s2_2 Are combined into L s2 ：
L′ s1 ＝L s1 +L s0_1
L s2 ＝L s2_1 +L s2_2 ；
Step 10: the constant current output value and the constant voltage output value of the system have consistency along with the change of the coupling coefficient, if the corresponding input voltage values of the system in the constant current stage and the constant voltage stage at the same coupling coefficient are the same, the relation formula required to be met is as follows:
wherein: i is CC And U CV Respectively a load constant current charging current and a constant voltage charging voltage.
An electronic device comprising a memory storing a computer program and a processor implementing the steps of the above method when executing the computer program.
A computer readable storage medium storing computer instructions which, when executed by a processor, implement the steps of the above-described method.
The invention realizes the conversion of constant-current/constant-voltage working modes only by switching two fixed working frequencies under the condition of variable coupling coefficients, and the two working modes both meet the zero phase angle. In addition, the compensation topology suppresses higher harmonics of the rectifying unit, so that the output current and voltage values of the system are more stable.
The parameters for determining the topology by using the above-mentioned method for designing parameters of the topology are shown in table 1. The constant current output current 6A, the constant voltage output voltage 144V and the transmission power 864W are provided.
TABLE 1 topological Structure parameters
Fig. 5 shows the transconductance gain and the voltage gain of the wireless power transmission system respectively varying with the coupling coefficient and the load.
As can be seen from fig. 5 (a), the transconductance gain of the system decreases with the increase of the coupling coefficient, and when the coupling coefficient of the system is fixed and the load changes, the transconductance gain of the system remains constant, so that the system is known to have a constant current output characteristic;
as can be seen from fig. 5 (b), the voltage gain of the system increases with the decrease of the coupling coefficient, and when the coupling coefficient is constant and the load is changed, the voltage gain of the system is kept constant, so that the system is known to have a constant voltage output characteristic.
In both operating modes of the system, the input impedance angle varies with load and coupling coefficient as shown in fig. 6, and the input impedance angle of the system is not equal to 0 ° due to the influence of the internal resistance of the device.
As can be seen from fig. 6 (a), when the load value is smaller and the coupling coefficient is larger, the input impedance angle of the system corresponding to the constant current mode is larger, but in the constant current mode, the absolute value of the maximum input impedance angle does not exceed 0.266 ° at most;
when the system is operated in the constant voltage output mode, the input impedance angle increases with the decrease of the coupling coefficient, but the absolute value of the input impedance angle does not exceed 3.0 degrees at most.
In the case of the wireless power transmission system with variable coupling coefficient, the transmission efficiency of the two operation modes varies with load as shown in fig. 7.
As can be seen from fig. 7 (a), when the system operates in the constant current mode, the transmission efficiency of the system increases with the increase of the coupling coefficient, and conversely, decreases with the increase of the load value, and in the constant current mode, the transmission efficiency of the system is higher than 93.7%;
as can be seen from fig. 7 (b), in the constant voltage mode of the system, the transmission efficiency increases with the increase of the load and the coupling coefficient, and the overall efficiency is higher than 93.7%.
The wireless charging system with the zero phase angle constant current and constant voltage output characteristic and the parameter design method provided by the invention are introduced in detail, the principle and the implementation mode of the invention are explained, and the explanation of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A secondary side circuit of a wireless charging system with zero phase angle constant current and constant voltage output characteristics is characterized in that:
the secondary circuit comprises a receiving coil L s1 First compensation network Z s1 Secondary side compensation inductance L s2 Secondary side compensation capacitor C s1 、C s2 And C s3 Second compensation network Z D0 A rectifier unit and a load resistor R;
the receiving coil L s1 One end and secondary side compensation capacitor C s1 Is connected with one end of the secondary side compensating capacitor C s1 And the other end of the first compensation network Z s1 Is connected to one end of a first compensation network Z s1 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s2 One end of and the secondary side compensation inductance L s2 One end of the two ends are connected;
secondary side compensation inductance L s2 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s3 Is connected to the rectifying unit, a receiving coil L s1 The other end of the capacitor is respectively connected with a secondary side compensation capacitor C s2 The other end and the secondary side compensation capacitor C s3 The other ends of the two are connected; the rectifying unit is connected with a load resistor R.
2. The secondary-side circuit of claim 1, wherein:
said first compensation network Z s1 Comprising a secondary compensation inductance L s0 And secondary side compensation capacitor C s0 (ii) a The secondary compensation inductance L s0 And secondary side compensation capacitor C s0 Are connected in series;
said second compensation network Z D0 Including a secondary compensation inductance L D0 And secondary side adjustable capacitor C D0_X (ii) a The secondary compensation inductance L D0 And secondary side adjustable capacitor C D0_X Are connected in series.
3. The secondary-side circuit of claim 1, wherein:
the secondary compensation inductance L s2 Comprises n compensation sub-inductors L s2_n 。
4. A wireless charging system with zero phase angle constant current constant voltage output characteristic which characterized in that:
the wireless charging system comprises a primary side circuit and a secondary side circuit,
the primary side circuit comprises a direct current voltage source U DC Inversion unit, primary side compensation network and transmitting coil L p2 ；
The secondary side circuit is the secondary side circuit of any one of claims 1-3;
the DC voltage source U DC Connecting an inversion unit, the inversion unit, a primary side compensation network and a transmitting coil L p2 Are connected, the transmitting coil L p2 And a receiving coil L s1 And (5) mutual inductance.
5. The wireless charging system of claim 4, wherein:
the primary side compensation network is a PS compensation structure;
the PS compensation structure comprises a primary side compensation inductor L p1 Primary side compensation capacitor C p1 And C p2 ；
In the primary side compensation network, a primary side compensation inductor L p1 And primary side compensation capacitor C p1 Form a parallel branch and a primary side compensation capacitor C p2 And a transmitting coil L p2 And forming a series branch, wherein the parallel branch and the series branch are connected in series.
6. The wireless charging system of claim 4, wherein:
the inversion unit comprises four switching tubes Q 1 、Q 2 、Q 3 And Q 4 ；
The DC voltage source U DC Respectively with the positive pole of the switching tube Q 1 And Q 2 One end of the two ends are connected;
switch tube Q 1 The other end of the switch tube is respectively connected with the switch tube Q 3 And primary side transmitting coil L p2 Is connected with each other;
switch tube Q 2 And the other end of the switch tube Q 4 Primary side compensation inductance L p1 One terminal of and primary side compensation capacitor C p1 One end of the two ends are connected;
DC voltage source U DC Respectively with the switching tube Q 3 And Q 4 The other ends of the two are connected;
primary side compensation capacitor C p2 One end of which is respectively connected with the primary side compensation inductance L p1 Another terminal of (1) and primary side compensation capacitor C p1 The other ends of the two are connected;
primary side compensation capacitor C p2 And the other end of the transmitting coil L p2 The other ends of the two are connected.
7. The wireless charging system of claim 4, wherein:
the rectifying unit comprises four diodes D 1 、D 2 、D 3 、D 4 And a capacitor C 0 ；
One end of the load resistor R is respectively connected with the capacitor C 0 One end of (1), diode D 1 And diode D 2 The negative electrodes are connected;
diode D 1 Respectively connected with a diode D 3 Negative electrode of (2) and secondary side adjustable capacitor C D0_X ；
The other end of the load resistor R is respectively connected with the capacitor C 0 Another terminal of (1), diode D 3 Anode and diode D 4 The positive electrodes of the two electrodes are connected;
diode D 2 Respectively connected with a diode D 4 Negative pole and secondary side compensation capacitor C s3 Secondary side compensating capacitor C s2 And a receiving coil L s1 。
8. A parameter design method of a wireless charging system with zero phase angle constant current and constant voltage output characteristics is characterized in that:
the parameter design method specifically comprises the following steps:
step 1: constructing a topological structure with constant current and constant voltage output characteristics under the condition of variable coupling coefficients;
step 2: when the topological structure has constant current output characteristic, the transmitting coil L p2 Primary side compensation inductance L p1 Primary side compensation capacitor C p1 And C p2 Secondary side compensation inductance L s2_1 And L s2_2 Minor edgeCompensation capacitor C s2 And C s3 The satisfied relational expression is:
wherein, ω is CC The angular frequency is corresponding to the constant current mode; j is an imaginary symbol;
and step 3: when the topology has a constant voltage output characteristic, the transmitting coil L p2 Primary side compensation inductance L p1 Primary side compensation capacitor C p1 And C p2 Secondary side compensation inductance L s2_1 And L s2_2 Secondary side compensating capacitor C s2 The satisfied relation is:
wherein, ω is CV The angular frequency is corresponding to the constant voltage mode;
and 4, step 4: solving based on the relational expression in the step 2 and the step 3 to obtain the working angular frequency omega when the system works in the constant-current mode and the constant-voltage mode respectively CV And ω CC ：
Wherein: lambda [ alpha ] p Is the ratio of the capacitance of the primary side,
and 5: when the system is operated in a constant voltage mode and has a zero phase angle output characteristic, the receiving coil L s1 Secondary side compensation inductance L s2_1 And L s2_2 And a secondary side compensation capacitor C s1 And C s3 The relation to be satisfied is:
step 6: compensating capacitor C on the secondary side s1 、C s2 A compensation inductor L connected in series is added between s0 And a compensation capacitor C s0 Compensating the secondary side circuit to compensate the inductance L s0 And a compensation capacitor C s0 Secondary input impedance Z s1 The relations are respectively:
and 7: let Z in step 6 s1 =0, to obtain the compensation inductance L s0 And a compensation capacitor C s0 The relation is as follows:
and step 8: the system is added in the rectifying unit to introduce higher harmonic wave, and a series compensation inductor L is added in front of the rectifying unit D0 And an adjustable capacitor C D0_X The system can adjust the capacitance C under the constant current and constant voltage working modes D0_X Respectively as follows:
wherein C D0_CC Adjustable capacitor C for system under constant current working mode D0_X Relation of (a), C D0_CV Adjustable capacitor C for system in constant voltage working mode D0_X The relational expression of (1);
and step 9: merging of identical devices in the same branch, i.e. L s0 And L s1 Are combined into L' s1 、C s0 And C s1 Are combined to be C' s1 、L s2_1 And L s2_2 Are combined into L s2 ：
L′ s1 ＝L s1 +L s0_1
L s2 ＝L s2_1 +L s2_2 ；
Step 10: the corresponding input voltage values of the system in two stages of constant current and constant voltage at the same coupling coefficient are the same, and the relation required to be met is as follows:
wherein: i is CC And U CV Respectively a load constant current charging current and a constant voltage charging voltage.
9. An electronic device comprising a memory and a processor, the memory storing a computer program, wherein the processor implements the steps of the method of claim 6 when executing the computer program.
10. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of the method of claim 6.
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| CN116799928B (en) * | 2023-08-22 | 2023-12-19 | 中国人民解放军海军工程大学 | Capacitance parameter compensation method of S-S type wireless power supply system |
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