CN112583137A - Magnetic resonance type wireless charging system - Google Patents
Magnetic resonance type wireless charging system Download PDFInfo
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- CN112583137A CN112583137A CN202011506201.0A CN202011506201A CN112583137A CN 112583137 A CN112583137 A CN 112583137A CN 202011506201 A CN202011506201 A CN 202011506201A CN 112583137 A CN112583137 A CN 112583137A
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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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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/18—Status alarms
- G08B21/185—Electrical failure alarms
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B7/00—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00
- G08B7/06—Signalling systems according to more than one of groups G08B3/00 - G08B6/00; Personal calling systems according to more than one of groups G08B3/00 - G08B6/00 using electric transmission, e.g. involving audible and visible signalling through the use of sound and light sources
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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
- H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
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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
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
- H02J7/04—Regulation of charging 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
- H02M1/00—Details of apparatus for conversion
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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- H04B5/79—
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
- H05K7/20009—Modifications to facilitate cooling, ventilating, or heating using a gaseous coolant in electronic enclosures
- H05K7/20136—Forced ventilation, e.g. by fans
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention discloses a magnetic resonance type wireless charging system which comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a mains supply and used for transmitting a wireless electric energy signal, the receiving end is used for receiving the wireless electric energy signal to charge a load, and the transmitting end comprises a transmitting main control MCU, a transmitting coil and a first sampling module which is electrically connected with the transmitting main control MCU; the receiving end comprises a receiving coil connected with a load, and the transmitting master control MCU is used for controlling the coupling of the transmitting coil and the receiving coil so as to charge the load; the first sampling module is used for monitoring the output power of the transmitting coil and demodulating the wireless electric energy signal so that the system is compatible with a QI wireless charging protocol. The system can realize remote charging of the load based on the magnetic resonance principle, can support a QI wireless charging protocol and a one-to-many charging mode, is fast and convenient to charge, can realize automatic dynamic matching of resonance of the transmitting end and the receiving end through the receiving resonance module, and is high in matching efficiency.
Description
Technical Field
The invention relates to the technical field of wireless charging, in particular to a magnetic resonance type wireless charging system.
Background
With the development of science and technology, the wireless power transmission technology has gained great attention in both academic and engineering fields. Due to its convenience, the inductive wireless power transmission scheme of 110kHz to 210kHz is widely used in consumer electronics products such as cell phones and headsets. However, the inductive wireless power transmission technology has a drawback in that it cannot provide a charging distance, which generally requires contact charging.
Therefore, people turn to research a magnetic resonance type charging scheme, which operates based on the principle of magnetic resonance, and the scheme assumes that two coils with the same frequency are used at a transmitting end and a receiving end of a system for magnetic field coupling, so that electric energy is transmitted to a load in a long distance (without contacting as a magnetic induction charging scheme), so that the research prospect is high, but the scheme is not mature at present, and the following defects exist:
1) the wireless charging protocol is incompatible with QI, and the use is inconvenient;
2) the wireless electric energy transmission distance is short, a one-to-many charging mode cannot be realized, and the charging efficiency is not high;
3) the parameters of the components of the resonant network are inevitably different, so that the transmitting end and the receiving end are difficult to be subjected to resonant matching, manual adjustment is generally needed, time and labor are wasted, and the matching efficiency is low.
Disclosure of Invention
The invention aims to provide a magnetic resonance type wireless charging system which can realize remote charging of a load based on a magnetic resonance principle, can support a QI wireless charging protocol and a one-to-many charging mode, is quick and convenient to charge, can realize automatic and dynamic resonance matching of a transmitting end and a receiving end through a receiving resonance module, and has high matching efficiency.
In order to realize the purpose, the following technical scheme is adopted:
a magnetic resonance type wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a mains supply and used for transmitting a wireless electric energy signal, the receiving end is used for receiving the wireless electric energy signal to charge a load, and the transmitting end comprises a transmitting main control MCU, a transmitting coil and a first sampling module which is electrically connected with the transmitting main control MCU; the receiving end comprises a receiving coil connected with a load, and the transmitting master control MCU is used for controlling the coupling of the transmitting coil and the receiving coil and transmitting a wireless electric energy signal to the receiving coil so as to charge the load; the first sampling module is used for monitoring the output power of the transmitting coil and demodulating the wireless electric energy signal so that the system is compatible with a QI wireless charging protocol.
Furthermore, the transmitting end further comprises a first communication module, and an EMC filtering module, a PFC boosting module, a half-bridge module and a transmitting resonance module which are electrically connected in sequence; the first communication module is electrically connected with the transmission main control MCU, the EMC filtering module is also connected with commercial power, and the transmission resonance module is also respectively connected with the transmission coil and the first sampling module; and a driving circuit module is also connected between the emission main control MCU and the half-bridge module, and an auxiliary power supply module is also connected between the emission main control MCU and the PFC boosting module.
Furthermore, the transmitting terminal further comprises a heat dissipation module and a first warning module which are respectively electrically connected with the transmitting master control MCU.
Further, the first sampling module comprises a voltage and current sampling unit and a signal demodulation unit.
Further, the signal demodulation unit comprises a comparator and two RC filtering units; the non-inverting input end and the inverting input end of the comparator are respectively connected with the transmitting resonance module through an RC filtering unit.
Furthermore, the receiving end also comprises a receiving resonance module, a rectifying and filtering module and a DC-DC conversion module which are sequentially connected between the receiving coil and the load, and a receiving main control MCU which is respectively and electrically connected with the receiving resonance module and the DC-DC conversion module; the receiving main control MCU is also connected with a second communication module used for communicating with the transmitting terminal.
Furthermore, the receiving end further comprises a second warning module electrically connected with the receiving main control MCU, and a second sampling module connected between the receiving main control MCU and the DC-DC conversion module.
Further, the receiving resonance module comprises a plurality of resonance units connected in parallel and a first resonance capacitor connected in parallel with the resonance units; the plurality of resonance units and the first resonance capacitor are connected between the receiving coil and the rectification filter module, each resonance unit comprises a switch and a second resonance capacitor which are connected in series, and the switch of each resonance unit is connected with the receiving main control MCU.
By adopting the scheme, the invention has the beneficial effects that:
1) the system is reasonable in design, can realize remote charging of the load, does not need to be contacted, and is convenient to charge;
2) a signal demodulation unit is added in the voltage and current acquisition unit, so that a QI wireless charging protocol can be supported, the charging requirements of different users are met, a one-to-many charging mode is supported, and charging is quick and convenient;
3) the resonance automatic dynamic matching of the transmitting end and the receiving end is realized through the receiving resonance module, and the matching efficiency is high;
4) the heat dissipation module is arranged, so that the system can be cooled, and meanwhile, the first warning module and the second warning module are arranged, so that warning information can be sent to the outside when the system works abnormally, and the safety of system operation is guaranteed.
Drawings
FIG. 1 is a schematic block diagram of a transmitting end of the present invention;
FIG. 2 is a schematic block diagram of a receiving end of the present invention;
FIG. 3 is a circuit diagram of a signal demodulation unit of the present invention;
FIG. 4 is a schematic circuit diagram of a receive resonant module of the present invention;
FIG. 5 is a circuit diagram of a transmit master MCU of the present invention;
FIG. 6 is a circuit diagram of an auxiliary power module according to the present invention;
FIG. 7 is a circuit diagram of an EMC filter module and a PFC boost module according to the present invention;
FIG. 8 is a circuit diagram of the transmission resonant module, the driving circuit module and the voltage and current sampling unit according to the present invention;
wherein the figures identify the description:
1-a transmitting end; 2-a receiving end;
3-an auxiliary power supply module; 4, a heat dissipation module;
5-a first warning module; 11-transmitting a master control MCU;
12 — a first sampling module; 13 — a first communication module;
14-EMC filtering module; 15-PFC boost module;
16-half bridge module; 17-a transmission resonance module;
18-a driving circuit module; 21-a receiving coil;
22-a receiving resonance module; 23, a rectifying and filtering module;
24-DC conversion module; 25-receiving a master control MCU;
26-a second communication module; 27-a second warning module;
28-a second sampling module; 121-voltage current sampling unit;
122-signal demodulation unit; 221 — resonant cell.
Detailed Description
The invention is described in detail below with reference to the figures and the specific embodiments.
Referring to fig. 1 to 8, the present invention provides a magnetic resonance wireless charging system, including a transmitting terminal 1 connected to a mains supply and configured to transmit a wireless power signal, and a receiving terminal 2 configured to receive the wireless power signal to charge a load, where the transmitting terminal 1 includes a transmitting main control MCU11, a transmitting coil, and a first sampling module 12 electrically connected to a transmitting main control MCU 11; the receiving end 2 comprises a receiving coil 21 connected with a load, and the transmitting master control MCU11 is used for controlling the coupling of the transmitting coil and the receiving coil 21 and transmitting a wireless power signal to the receiving coil 21 to charge the load; the first sampling module 12 is configured to monitor the output power of the transmitting coil, and is further configured to demodulate the wireless power signal so that the system is compatible with the QI wireless charging protocol.
The transmitting terminal 1 further comprises a first communication module 13, and an EMC filtering module 14, a PFC boosting module 15, a half-bridge module 16 and a transmitting resonance module 17 which are electrically connected in sequence; the first communication module 13 is electrically connected with the transmission master control MCU11, the EMC filter module 14 is also connected with the mains supply, and the transmission resonance module 17 is also respectively connected with the transmission coil and the first sampling module 12; a driving circuit module 18 is connected between the emission main control MCU11 and the half-bridge module 16, and an auxiliary power supply module 3 is connected between the emission main control MCU11 and the PFC boost module 15; the transmitting terminal 1 further comprises a heat dissipation module 4 and a first warning module 5 which are respectively electrically connected with the transmitting main control MCU 11; the first sampling module 12 includes a voltage-current sampling unit 121 and a signal demodulation unit 122.
The signal demodulation unit 122 includes a comparator, and two RC filtering units; the non-inverting input end and the inverting input end of the comparator are respectively connected with the transmitting resonance module 17 through an RC filtering unit; the receiving end 2 further comprises a receiving resonance module 22, a rectifying and filtering module 23, a DC-DC conversion module 24, and a receiving main control MCU25 electrically connected to the receiving resonance module 22 and the DC-DC conversion module 24 respectively, which are sequentially connected between the receiving coil 21 and the load; the receiving master control MCU25 is also connected with a second communication module 26 for communicating with the transmitting terminal 1; the receiving end 2 further comprises a second warning module 27 electrically connected to the receiving main control MCU25, and a second sampling module 28 connected between the receiving main control MCU25 and the DC-DC conversion module 24; the receiving resonance module 22 comprises a plurality of resonance units 221 connected in parallel, and a first resonance capacitor connected in parallel with the resonance units 221; the plurality of resonance units 221 and the first resonance capacitor are connected between the receiving coil 21 and the rectifying and filtering module 23, each resonance unit 221 includes a switch and a second resonance capacitor connected in series, and the switch of each resonance unit 221 is connected with the receiving main control MCU 25.
The working principle of the invention is as follows:
continuing to refer to fig. 1 to 8, this wireless charging system adopts magnetic resonance's mode to realize long-range (need not contact) wireless charging to the load, and wherein the load can be electronic equipment such as smart mobile phone, fan, reequips receiving terminal 2 on electronic equipment to place this equipment in the transmitting area of transmitting terminal 1, can realize long-range charging (can contact, also can not contact), convenient and practical, specifically:
transmitting terminal 1: the transmitting terminal 1 can provide electric energy (transmit wireless electric energy signals) to the receiving terminal 2 in a magnetic resonance mode, when the transmission power is 5W, the transmission distance can exceed 50cm, the transmission power of more than 500W can be supported, the electric energy can be transmitted to a plurality of loads at the same time, and the universality is high; as shown in fig. 1, during operation, the commercial power is inputted with 220V ac, filtered and rectified by the EMC filter module 14, and then transmitted to the PFC boost module 15 to be converted into high voltage DC (DC 390V); then, the high-voltage dc voltage is converted into a dc square wave by the half-bridge module 16, the dc square wave is converted into an ac sine wave in the LC network in the transmission resonance module 17 and flows through the transmission coil, thereby transmitting electric energy to the receiving end 2; in addition, an auxiliary power module 3 is further connected between the PFC boost module 15 and the transmission main control MCU11, and the auxiliary power module 3 can generate several sets of dc voltages, which are used to drive the transmission main control MCU11, the driving circuit module 18, the heat dissipation module 4, the first warning module 5, and other internal low-power components to operate.
After the transmission main control MCU11 IS started, the voltage-current sampling unit 121 of the first sampling module 12 IS controlled to monitor the operating state of the transmitting coil, including the IS value (current, voltage, and alternating magnetic field strength of the transmitting coil, etc. to ensure that the magnetic field of the receiving end 2 IS stable and will not be affected by the increase of the number of loads) flowing through the transmitting coil, the detection IS2 of the input total current (which can be used as a signal for outputting the total power and load change), the temperature detection signal Ts (for over-temperature protection) and the unlocking signal (for unlocking hardware protection); if there is an abnormality, the transmitting main control MCU11 will control the first warning module 5 to send out warning information, in this embodiment, the first warning module 5 includes an LED indicator and a buzzer, and when the abnormality occurs, the buzzer alarms and the LED indicator flashes to alert in time; if there is no abnormality, the transmission main control MCU11 turns on the heat dissipation module 4 (including the heat dissipation fan), and controls the driving circuit module 18 to turn on through the relay, so as to control the half-bridge module 16 to output square waves; the square wave frequency IS decreased progressively from the initial frequency, each time one unit IS decreased progressively, then one time length IS waited, the IS value IS detected, if the IS value does not reach the target value, one unit IS decreased progressively, one time length IS waited to be detected for a moment, the steps are repeated, and the adjustment IS stopped until the IS value reaches the target value; after the stable working state IS entered, the emission master control MCU11 can continuously inquire an IS value, an IS2 value, a TS value and an unlocking signal, when the IS value deviates beyond a preset value, the square wave frequency can be automatically adjusted, and other corresponding reactions are made according to the sampling value; in addition, for a load with a communication requirement, load data can be acquired through a transmitting coil demodulation signal or the first communication module 13 (adopting Bluetooth), and then corresponding state adjustment is made; when the transmitting main control MCU11 detects the abnormal signal, it immediately stops outputting the square wave and goes to the error alarm state.
In order to be compatible with the QI wireless charging protocol, as shown in fig. 3, a signal demodulation unit 122 is added in a voltage and current acquisition unit, one path of current signals generated by a transformer is provided for hardware protection so as to rapidly turn off and output under abnormal conditions, the other path of current signals is sent to a transmission main control MCU11 as a power feedback value, the other path of current signals is sent to a comparator for signal demodulation, two RC filtering units are arranged at the input end of the comparator to form a band-pass filter, and the bandwidth of the band-pass corresponds to the communication frequency, so that effective communication signals are obtained; meanwhile, in order to realize remote power supply, a coil with a diameter slightly larger than a transmission distance needs to be selected, for example, for a load such as a mobile phone with a small receiving area in a magnetic field, in order to obtain sufficient power, in addition to increasing the magnetic field strength, the changing speed of an alternating magnetic field needs to be increased (the driving frequency is increased) to improve the power density of the transmitting end 1, and in addition, the matching degree of a magnetic conductive material and transmitting and receiving resonance is also an important condition. However, these conditions are contradictory, for example, increasing the frequency will result in a decrease in the number of turns of the coil, which in turn will result in a decrease in the magnetic field strength, and therefore, it is desirable to balance the conditions well, to adjust certain parameters while minimizing the effect on other parameters, and only when all conditions are optimally set, will the transmitted energy be maximized and the distance be maximized, in one of the embodiments where one transmission distance is 50cm and the power is 10W, the size of the transmitting coil is 40 cm 50cm (9 turns), and the bottom of the coil is laid with 1mm thick PC95 conductive sheets, and the size of the receiving coil 21 is 8 cm 16 (15 turns), without conductive material.
Because a large transmitting coil and an open magnetic field are adopted, a one-to-many charging mode (a plurality of loads are charged simultaneously) can be further realized, after each load obtains energy from the alternating magnetic field, the received power can be automatically adjusted through the receiving resonance module 22 and the DC-DC conversion module 24 of the receiving end 2 of the load so as to supply power to the loads, and only when the power is not met, a request for increasing the transmitting power can be initiated to the transmitting end 1; the communication between the load and the transmitting terminal 1 is realized by the communication between the first communication module 13 (bluetooth) and the second communication module 26 (bluetooth), and the load is taken as a mobile phone for explanation: when the mobile phone is placed in a transmitting area of a transmitting terminal 1, the mobile phone sends a charging request to the transmitting terminal 1, a host (background) of the transmitting terminal 1 receives the request and inquires an ID of the mobile phone, if the ID is NULL, the mobile phone is assigned with the ID (a unique identification code, and when the mobile phone is charged once and is charged again, the ID does not need to be assigned again), the ID is assigned to be divided into two conditions, one is that a single mobile phone is charged and is directly assigned, and the other is that when a plurality of mobile phones are charged simultaneously, the current and the voltage of different mobile phones are different, the difference of different mobile phone terminals can be positioned according to the ID (considering that the voltage has micro-change), and whether the transmitting power needs to be increased or not is judged through an obtained CMD command.
And a receiving end 2: the second communication module 26 of the receiving end 2 is bluetooth, and can communicate with the transmitting end 1, and the second warning module 27 includes a buzzer and an LED indicator, and is used for sending a warning to the outside when an abnormality occurs; during operation, after receiving the energy (electric energy signal) transmitted by the transmitting terminal 1, the receiving coil 21 is adjusted to a resonance point through the receiving resonance module 22 to maximize the received energy, and then the receiving coil passes through the rectifying and filtering module 23 to generate a pre-stage voltage, which is converted into a target voltage through the DC-DC conversion module 24 to supply power to a post-stage load, during which, the receiving terminal 2 can transmit the current load information to the transmitting terminal 1, so that the transmitting terminal 1 can adjust the transmitting power as required to maintain the optimal efficiency point.
Transmitting terminal 1 and receiving terminal 2 all have respective resonant circuit (transmitting terminal 1's transmission resonance module 17, receiving terminal 2's receipt resonance module 22), constitute by respective LC circuit, will make the resonant circuit operating frequency on both sides roughly equal, and the component parameter error that needs both sides is very little, and this point of actual operation gets up hardly, adjusts through manual usually, wastes time and energy, and consequently, this system has designed a resonant circuit that can dynamically match in receiving terminal 2:
referring to fig. 4, the circuit achieves matching requirements by controlling the switches of one resonant unit 221 through the receiving master MCU25, and the matching accuracy can be improved to a very high level according to the 2-ary coding by the switches, for example, in this embodiment, the number of the resonant units 221 is set to 5, so there are 2 powers of 5, i.e., 32 matching modes, and 6 groups of switches have 2 powers of 6, i.e., 64 matching modes, and so on, the more the switches, the higher the matching accuracy; specifically, the receiving coil 21 is L in the resonant circuit, C is composed of a resonant capacitor C0, a resonant capacitor C1, a resonant capacitor C2, a resonant capacitor C3, a resonant capacitor C4 and a resonant capacitor C5, and LC resonance is matched by changing the value of the resonant capacitor C; a series resonance circuit consisting of the receiving coil 21 and the resonance capacitor receives the electric energy of the transmitting coil, and the energy can be maximized at a resonance point; the switches S1-S5 are controlled by 5I/O pins of the MCU25, respectively, and if the high level 1 is set to switch on and 0 is set to switch off, the value of the resonant capacitor C and the code controlled by the MCU25 have the following correspondence:
| S5 | S4 | S3 | S2 | S1 | MCU control code | C1+C2+C3+C4+C5(nF) | Resonance capacitance C value (nF) |
| 0 | 0 | 0 | 0 | 0 | 0x00 | 0 | 100 |
| 0 | 0 | 0 | 0 | 1 | 0x01 | 1 | 101 |
| 0 | 0 | 0 | 1 | 0 | 0x02 | 2 | 102 |
| 0 | 0 | 0 | 1 | 1 | 0x03 | 3 | 103 |
| 0 | 0 | 1 | 0 | 0 | 0x04 | 4 | 104 |
| 0 | 0 | 1 | 0 | 1 | 0x05 | 5 | 105 |
| . | . | . | . | . | . | . | . |
| . | . | . | . | . | . | . | . |
| . | . | . | . | . | . | . | . |
| 1 | 1 | 1 | 0 | 0 | 0x1C | 28 | 128 |
| 1 | 1 | 1 | 0 | 1 | 0x1D | 29 | 129 |
| 1 | 1 | 1 | 1 | 0 | 0x1E | 30 | 130 |
| 1 | 1 | 1 | 1 | 1 | 0x1F | 31 | 131 |
Table 1 table of correspondence between resonant capacitor C and control code of receiving master MCU25
If the transmitting end 1 and the receiving end 2 are to resonate at the same frequency point, the following equation is required to be satisfied:
l (transmit) × C (transmit) × L (receive) × C (receive),
then it is deduced from the above equation:
c (receive) ═ L (transmit) × C (transmit)/L (receive),
here, C (reception) refers to the resonant capacitor C in the above description, and it can be seen that the changes of the values of the three right variable values can all be made equal by changing the value of C (reception), so the design realizes the same-frequency resonance at the transmitting end and the receiving end by changing C (reception), as in one embodiment, the LC parameters of the transmitting end 1 and the receiving end 2 are as follows:
l (transmission) ═ 120uH,
c (emission) ═ 10nF,
l (receive) ═ 10uH,
then C (receive) is 120 nF.
In addition, when the receiving end 2 receives energy from the transmitting end 1, the distance from the transmitting coil is far away, the voltage change of the receiving end 2 is very large due to factors such as light and heavy changes of its own load, and the difference between the highest voltage and the lowest voltage may be tens of times, so a wide voltage range DC-DC conversion module 24 is required to solve the problem, and at the same time, the resonant network needs to be adjusted to assist voltage stabilization, for example, when the preceding voltage is detected to be too high, the LC network deviates from the resonant point to reduce the receiving voltage, so that the voltage is ensured not to exceed the input range of the DC-DC conversion module 24, and the DC-DC conversion module 24 needs to achieve high efficiency and large current in a wide voltage range.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A magnetic resonance type wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end is connected with a mains supply and used for transmitting a wireless electric energy signal, and the receiving end is used for receiving the wireless electric energy signal to charge a load; the receiving end comprises a receiving coil connected with a load, and the transmitting master control MCU is used for controlling the coupling of the transmitting coil and the receiving coil and transmitting a wireless electric energy signal to the receiving coil so as to charge the load; the first sampling module is used for monitoring the output power of the transmitting coil and demodulating the wireless electric energy signal so that the system is compatible with a QI wireless charging protocol.
2. The magnetic resonance type wireless charging system according to claim 1, wherein the transmitting terminal further comprises a first communication module, and an EMC filtering module, a PFC boosting module, a half-bridge module and a transmitting resonance module which are electrically connected in sequence; the first communication module is electrically connected with the transmission main control MCU, the EMC filtering module is also connected with commercial power, and the transmission resonance module is also respectively connected with the transmission coil and the first sampling module; and a driving circuit module is also connected between the emission main control MCU and the half-bridge module, and an auxiliary power supply module is also connected between the emission main control MCU and the PFC boosting module.
3. The magnetic resonance wireless charging system according to claim 2, wherein the transmitting terminal further comprises a heat dissipation module and a first warning module electrically connected to the transmitting main control MCU.
4. The magnetic resonance wireless charging system according to claim 2, wherein the first sampling module comprises a voltage-current sampling unit and a signal demodulation unit.
5. The magnetic resonance wireless charging system according to claim 4, wherein the signal demodulation unit comprises a comparator, and two RC filtering units; the non-inverting input end and the inverting input end of the comparator are respectively connected with the transmitting resonance module through an RC filtering unit.
6. The magnetic resonance type wireless charging system according to claim 1, wherein the receiving end further comprises a receiving resonance module, a rectifying and filtering module and a DC-DC conversion module which are sequentially connected between the receiving coil and the load, and a receiving main control MCU which is electrically connected with the receiving resonance module and the DC-DC conversion module respectively; the receiving main control MCU is also connected with a second communication module used for communicating with the transmitting terminal.
7. The magnetic resonance wireless charging system of claim 6, wherein the receiving end further comprises a second warning module electrically connected to the receiving main control MCU, and a second sampling module connected between the receiving main control MCU and the DC-DC conversion module.
8. The magnetic resonance wireless charging system according to claim 6, wherein the receiving resonance module comprises a plurality of resonance units connected in parallel, and a first resonance capacitor connected in parallel with the plurality of resonance units; the plurality of resonance units and the first resonance capacitor are connected between the receiving coil and the rectification filter module, each resonance unit comprises a switch and a second resonance capacitor which are connected in series, and the switch of each resonance unit is connected with the receiving main control MCU.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115117979A (en) * | 2022-08-12 | 2022-09-27 | 惠州市奥嘉达科技有限公司 | Small-size long-distance wireless charging circuit and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115117979A (en) * | 2022-08-12 | 2022-09-27 | 惠州市奥嘉达科技有限公司 | Small-size long-distance wireless charging circuit and method |
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