CN219086889U - Wireless charging circuit - Google Patents
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- CN219086889U CN219086889U CN202223598445.3U CN202223598445U CN219086889U CN 219086889 U CN219086889 U CN 219086889U CN 202223598445 U CN202223598445 U CN 202223598445U CN 219086889 U CN219086889 U CN 219086889U
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Abstract
The application provides a wireless charging circuit, wireless charging circuit's transmitting end circuit has included excitation circuit and detection circuitry, in wireless charging process, control inverter circuit gets into interrupt state, and carry out quick Q value detection through excitation circuit and detection circuitry, wherein, excitation circuit realizes charging to the resonant cavity, detection circuitry realizes underdamped oscillation peak voltage detection and interval oscillation number of times count, the result of detection is used for calculating resonant system's quality factor Q value, that is to say, wireless charging circuit of this embodiment is through the Q value detection in the charging process, high accuracy FOD detection in the charging process has been realized.
Description
Technical Field
The application relates to the technical field of wireless charging, in particular to a wireless charging circuit.
Background
Currently, wireless charging has the advantages of being free of charging cable constraint, connector-free plug mechanical abrasion and the like, and charging batteries by adopting wireless charging is becoming more and more common in consumer electronic equipment. Meanwhile, with the continuous increase of wireless charging power, wireless charging safety and foreign object detection (FOD detection) are becoming increasingly serious. Traditional wireless charging FOD detection is mainly divided into two types: q value detection and Ploss.
Q value detection: before the wireless charging starts to operate, the quality factor q=wl/R of the resonance system is used to determine whether there is a foreign object. The Q value is calculated by injecting excitation energy at Tx to cause the coil to under-damped oscillation, and then detecting the damping coefficient. The method has higher detection precision which reaches more than 98%, but the existing system can only be used for detection before starting.
Ploss detection: the theory of Ploss detection is that energy transmitted by Tx and energy received by Rx are calculated respectively, and the subtraction of the two is energy loss in the transmission process, and whether foreign matters exist is judged by setting a threshold value. This method requires high-precision calculation of Tx and Rx energy, and has a limited calculation precision with a large number of intermediate calculation variables, typically about 95%. For a wireless charging system of 50W, a power loss of 2.5W is a 5% error, and for metal eddy current loss, a higher temperature can be generated, which poses a safety risk to the charging system. The method has the advantages that the method can solve, calculate and judge the foreign matters in real time in the wireless charging process.
The advantages and disadvantages of the two detection modes are as described above, namely, the two detection modes have the disadvantages and are applicable to different occasions. The FOD detection in the most important charging process can only use Ploss detection with lower detection accuracy. The comparison of the merits of the two detection modes is shown in the following table:
| q value detection | Ploss detection | |
| Advantages are that | The detection precision is more than 98 percent | In-process detection of charging |
| Disadvantages | Detecting that the power is required to be cut off and restarted, and using before starting | The detection precision is lower than 95 percent |
That is, the existing detection method cannot realize high-precision FOD detection in the charging process.
Disclosure of Invention
An object of the embodiment of the application is to provide a wireless charging circuit for solving the problem that the existing detection mode cannot realize high-precision FOD detection in the charging process.
The wireless charging circuit provided by the embodiment of the application comprises a transmitting end circuit and a receiving end circuit;
the transmitting end circuit comprises a transmitting end resonant network and an inverter circuit, and the output end of the inverter circuit is connected with the input end of the transmitting end resonant network;
the transmitting end resonant network comprises a transmitting coil and a first capacitor which are connected in series;
an excitation circuit is connected between the transmitting coil and the first capacitor and is used for charging the transmitting end resonant network;
a detection circuit is further connected between the transmitting coil and the first capacitor and is used for detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of a closed loop underdamped oscillation loop comprising the transmitting coil and the first capacitor; the detection results of the underdamped oscillation peak voltage detection and the interval oscillation frequency counting are used for calculating the Q value representing the wireless charging FOD.
In the above technical scheme, the transmitting end circuit of the wireless charging circuit comprises an excitation circuit and a detection circuit, in the wireless charging process, the inverter circuit is controlled to enter an interruption state, and rapid Q value detection is performed through the excitation circuit and the detection circuit, wherein the excitation circuit realizes energy charging of the resonant cavity, the detection circuit realizes under-damped oscillation peak voltage detection and interval oscillation frequency counting, and the detection result is used for calculating the Q value of the quality factor of the resonant system, that is, the wireless charging circuit of the embodiment realizes high-precision FOD detection in the charging process through the Q value detection in the charging process.
In some alternative embodiments, the inverter circuit comprises a full-bridge inverter circuit consisting of a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor;
the S electrode of the first MOS tube is connected to the D electrode of the second MOS tube, the S electrode of the third MOS tube is connected to the D electrode of the fourth MOS tube, and the S electrodes of the second MOS tube and the fourth MOS tube are grounded; the S electrode of the first MOS tube is also connected to one end of the transmitting coil, and the S electrode of the third MOS tube is also connected to one end of the first capacitor;
when the second MOS tube and the fourth MOS tube are closed and the first MOS tube and the third MOS tube are opened, the transmitting coil, the first capacitor, the second MOS tube and the fourth MOS tube form a closed-loop under-damped oscillation loop.
In some alternative embodiments, the excitation circuit includes a first resistor, a first switch, and an excitation power supply connected in series, the negative terminal of the excitation power supply being grounded;
when the first MOS tube, the second MOS tube and the third MOS tube are disconnected, the fourth MOS tube is closed, and the first switch is closed, the first resistor and the excitation power supply are used for controlling energy of the transmitting end resonant network.
In some alternative embodiments, the detection circuit includes a second resistor, a third resistor, and a detection module;
the first end of the second resistor is connected in parallel between the transmitting coil and the first capacitor, and the second end of the second resistor is grounded after passing through the third resistor;
the two ends of the third resistor are connected with a second switch in parallel;
the second end of the second resistor is also connected to the detection module;
and when the second switch is closed, the detection module is used for collecting the peak voltage of the closed-loop under-damped oscillation loop and counting the oscillation times.
In some alternative embodiments, the receiver circuit includes a receiver resonant network and a rectifying circuit, an output of the receiver resonant network being connected to an input of the rectifying circuit.
The embodiment of the application provides a Q value detection method of a wireless charging circuit, wherein the wireless charging circuit comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit comprises a transmitting end resonant network and an inverter circuit, and the output end of the inverter circuit is connected with the input end of the transmitting end resonant network; the transmitting end resonant network comprises a transmitting coil and a first capacitor which are connected in series; an excitation circuit is connected between the transmitting coil and the first capacitor and is used for charging the transmitting end resonant network; a detection circuit is further connected between the transmitting coil and the first capacitor and is used for detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of a closed loop underdamped oscillation loop comprising the transmitting coil and the first capacitor;
the method comprises the following steps:
charging the transmitting end resonant network through an excitation circuit;
stopping charging after charging is completed, and detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of the closed-loop underdamped oscillation loop through a detection circuit to obtain the peak voltage and the number of times of oscillation;
and obtaining the Q value for representing the wireless charging FOD according to the peak voltage and the oscillation times.
In the above technical scheme, the transmitting end circuit of the wireless charging circuit comprises an excitation circuit and a detection circuit, and in the wireless charging process, the inverter circuit is controlled to enter an interruption state to perform rapid Q value detection. The embodiment provides a method for detecting a Q value in a charging process, which realizes high-precision FOD detection in the charging process.
In some alternative embodiments, before the transmitting-end resonant network is energized by the excitation circuit, the method further includes:
in the wireless charging process, controlling the inverter circuit to enter an interrupt state;
wherein, the Q value is calculated by the following formula:
where N is the oscillation frequency, and Qs1 and Qs2 are peak voltages.
In some alternative embodiments, the inverter circuit comprises a full-bridge inverter circuit consisting of a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor;
the S electrode of the first MOS tube is connected to the D electrode of the second MOS tube, the S electrode of the third MOS tube is connected to the D electrode of the fourth MOS tube, and the S electrodes of the second MOS tube and the fourth MOS tube are grounded; the S electrode of the first MOS tube is also connected to one end of the transmitting coil, and the S electrode of the third MOS tube is also connected to one end of the first capacitor;
before charging the transmitting end resonant network, the method further comprises the following steps:
and controlling the first MOS tube, the second MOS tube and the third MOS tube to be opened, closing the fourth MOS tube, and closing the first switch.
In some alternative embodiments, the excitation circuit includes a first resistor, a first switch, and an excitation power supply connected in series, the negative terminal of the excitation power supply being grounded;
charging the transmitting end resonant network, comprising:
the energy control is carried out on the transmitting end resonant network by utilizing a first resistor and an excitation power supply, and the charging time is more than 3R 1 C p The method comprises the steps of carrying out a first treatment on the surface of the Wherein R1 is the resistance value of the first resistor, and Cp is the capacitance value of the first capacitor.
In some alternative embodiments, the detection circuit includes a second resistor, a third resistor, and a detection module;
the first end of the second resistor is connected in parallel between the transmitting coil and the first capacitor, and the second end of the second resistor is grounded after passing through the third resistor;
the two ends of the third resistor are connected with a second switch in parallel;
the second end of the second resistor is also connected to the detection module;
stopping charging, and detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of the closed-loop underdamped oscillation loop through a detection circuit, wherein the method comprises the following steps of:
opening the first switch, closing the second MOS tube, and enabling the transmitting coil, the first capacitor, the second MOS tube and the fourth MOS tube to form a closed-loop under-damped oscillation loop;
and collecting peak voltage of the closed-loop under-damped oscillation loop by using a detection module and counting oscillation times.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a wireless charging circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a wireless charging circuit according to an embodiment of the present disclosure;
fig. 3 is a flowchart of steps of a Q value detection method of a wireless charging circuit according to an embodiment of the present application;
fig. 4 is a waveform diagram of a working sequence for Q value detection in the wireless charging process according to the embodiment of the present application;
FIG. 5 is a schematic diagram of an operating state of a closed-loop under-damped oscillation loop according to an embodiment of the present disclosure;
fig. 6 is a waveform diagram of peak voltage according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
Referring to fig. 1, fig. 1 is a schematic diagram of a wireless charging circuit according to an embodiment of the present application, where the wireless charging circuit includes a transmitting end circuit and a receiving end circuit.
The transmitting end circuit comprises a transmitting end resonant network and an inverter circuit, and the output end of the inverter circuit is connected with the input end of the transmitting end resonant network; the transmitting end resonant network comprises a transmitting coil Lp and a first capacitor Cp which are connected in series; an excitation circuit is connected between the transmitting coil Lp and the first capacitor Cp, and the excitation circuit is used for charging the transmitting end resonant network; a detection circuit is further connected between the transmitting coil Lp and the first capacitor Cp, and the detection circuit is used for detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of a closed-loop underdamped oscillation loop comprising the transmitting coil Lp and the first capacitor Cp; the detection results of the underdamped oscillation peak voltage detection and the interval oscillation frequency counting are used for calculating the Q value representing the wireless charging FOD.
In the embodiment of the application, the transmitting end circuit of the wireless charging circuit comprises an excitation circuit and a detection circuit, the inverter circuit is controlled to enter an interruption state in the wireless charging process, and rapid Q value detection is performed through the excitation circuit and the detection circuit, wherein the excitation circuit charges a resonant cavity, the detection circuit detects underdamped oscillation peak voltage and counts the number of times of interval oscillation, and the detection result is used for calculating the Q value of the quality factor of the resonant system, that is, the wireless charging circuit in the embodiment realizes high-precision FOD detection in the charging process through the Q value detection in the charging process.
Specifically, referring to fig. 2, fig. 2 is a schematic diagram of a wireless charging circuit provided in an embodiment of the present application, where an inverter circuit includes a full-bridge inverter circuit composed of a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M3, and a fourth MOS transistor M4; the S electrode of the first MOS tube M1 is connected to the D electrode of the second MOS tube M2, the S electrode of the third MOS tube M3 is connected to the D electrode of the fourth MOS tube M4, and the S electrodes of the second MOS tube M2 and the fourth MOS tube M4 are grounded; the S electrode of the first MOS tube M1 is also connected to one end of the transmitting coil Lp, and the S electrode of the third MOS tube M3 is also connected to one end of the first capacitor Cp;
when the second MOS tube M2 and the fourth MOS tube M4 are closed and the first MOS tube M1 and the third MOS tube M3 are opened, the transmitting coil Lp, the first capacitor Cp, the second MOS tube M2 and the fourth MOS tube M4 form a closed-loop under-damped oscillation loop.
The exciting circuit comprises a first resistor R1, a first switch S1 and an exciting power supply which are connected in series, wherein the negative end of the exciting power supply is grounded; when the first MOS tube M1, the second MOS tube M2 and the third MOS tube M3 are opened and the fourth MOS tube M4 is closed and the first switch S1 is closed, the first resistor R1 and the excitation power supply are used for controlling energy of the transmitting end resonant network.
The detection circuit comprises a second resistor R2, a third resistor R3 and a detection module; the first end of the second resistor R2 is connected in parallel between the transmitting coil Lp and the first capacitor Cp, and the second end of the second resistor R2 is grounded after passing through the third resistor R3; the two ends of the third resistor R3 are connected with a second switch S2 in parallel; the second end of the second resistor R2 is also connected to the detection module; when the second switch S2 is closed, the detection module is used for collecting the peak voltage of the closed-loop under-damped oscillation loop and counting the oscillation times.
The receiving end circuit comprises a receiving end resonant network and a rectifying circuit, wherein the output end of the receiving end resonant network is connected to the input end of the rectifying circuit, and the receiving end resonant network comprises a second capacitor Cs and a receiving coil Ls.
Referring to fig. 3, fig. 3 is a flowchart illustrating steps of a Q value detection method of a wireless charging circuit according to an embodiment of the present application.
The wireless charging circuit comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit comprises a transmitting end resonant network and an inverter circuit, and the output end of the inverter circuit is connected with the input end of the transmitting end resonant network; the transmitting end resonant network comprises a transmitting coil Lp and a first capacitor Cp which are connected in series; an excitation circuit is connected between the transmitting coil Lp and the first capacitor Cp, and the excitation circuit is used for charging the transmitting end resonant network; a detection circuit is further connected between the transmitting coil Lp and the first capacitor Cp, and the detection circuit is used for detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of a closed-loop underdamped oscillation loop comprising the transmitting coil Lp and the first capacitor Cp;
the Q value detection method of the wireless charging circuit of the embodiment specifically includes:
step 100, charging a transmitting end resonant network through an excitation circuit;
step 200, stopping charging after charging is completed, and detecting the under-damped oscillation peak voltage and counting the interval oscillation times of the closed-loop under-damped oscillation loop through a detection circuit to obtain the peak voltage and the oscillation times;
and 300, obtaining the Q value for representing the wireless charging FOD according to the peak voltage and the oscillation times.
In this embodiment, a transmitting end circuit of the wireless charging circuit includes an excitation circuit and a detection circuit, and in the wireless charging process, the inverter circuit is controlled to enter an interrupt state to perform rapid Q value detection. The embodiment provides a method for detecting a Q value in a charging process, which realizes high-precision FOD detection in the charging process.
The Q value detection comprises three stages, namely a first stage for charging the resonant cavity, a second stage for detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation, and a third stage for calculating the Q value and judging the threshold value. When the embodiment is applied to the charging process, the resonant cavity has more energy before interruption, so that the energy of the resonant cavity can be firstly discharged, and then the resonant cavity is charged, or the energy discharge of the resonant cavity is directly controlled to be lower than a certain value. Methods for dumping the energy of the resonant cavity include, but are not limited to, adding additional circuitry to rapidly discharge and making a threshold determination to determine whether to dump the energy of the resonant cavity to a set point.
In the wireless charging start-up procedure, steps of Qi protocol detection, private protocol authentication, charging power slow-up and the like are included, and the steps generally take more than ten seconds. When the method is applied to the detection of the Q value in the charging process, the charging state needs to be interrupted until the detection is completed and then the high-power wireless charging is performed, and the wireless charging start-up process from the interruption of the charging state to the high-power wireless charging is also involved. In order to avoid the consumption of more than ten seconds, in the wireless charging start-up flow caused by Q value detection in the charging process, the steps of Qi protocol detection, private protocol authentication, charging power slow start and the like are directly skipped, and power derating start is performed, so that a high-power wireless charging state is entered. Among other things, the purpose of power derating is to avoid power surges from challenging the device, and ways to reduce the power rating include, but are not limited to, reducing the input voltage, increasing the switching frequency, reducing the duty cycle, etc.
In the following embodiments, the wireless charging circuit of fig. 2 is taken as an example, and the Q value detection method of the present embodiment is described in detail.
In the wireless charging circuit of the embodiment, the inverter circuit comprises a full-bridge inverter circuit consisting of a first MOS tube M1, a second MOS tube M2, a third MOS tube M3 and a fourth MOS tube M4; the S electrode of the first MOS tube M1 is connected to the D electrode of the second MOS tube M2, the S electrode of the third MOS tube M3 is connected to the D electrode of the fourth MOS tube M4, and the S electrodes of the second MOS tube M2 and the fourth MOS tube M4 are grounded; the S-pole of the first MOS transistor M1 is further connected to one end of the transmitting coil Lp, and the S-pole of the third MOS transistor M3 is further connected to one end of the first capacitor Cp.
The exciting circuit comprises a first resistor R1, a first switch S1 and an exciting power supply which are connected in series, and the negative end of the exciting power supply is grounded.
The detection circuit comprises a second resistor R2, a third resistor R3 and a detection module; the first end of the second resistor R2 is connected in parallel between the transmitting coil Lp and the first capacitor Cp, and the second end of the second resistor R2 is grounded after passing through the third resistor R3; the two ends of the third resistor R3 are connected with a second switch S2 in parallel; the second terminal of the second resistor R2 is also connected to the detection module.
Referring to fig. 4, fig. 4 is a waveform diagram of a working sequence of Q value detection in the wireless charging process according to the embodiment of the present application, and the following steps are described:
in the stage t 0-t 1, the wireless charging normally and stably operates;
at the time t 1-t 2 and at the moment t1, the grids G1, G2 and G3 are set to 0 and the grid G4 is set to 1 through MOS driving, at the moment, the first MOS tube M1, the second MOS tube M2 and the third MOS tube M3 are opened, the fourth MOS tube M4 is closed, meanwhile, the first switch S1 is closed, and the energy control is carried out on the resonant cavity through the first resistor R1 and the excitation power supply, wherein the time is longer than 3R1 multiplied by Cp, R1 is the resistance value of the first resistor R1, and Cp is the capacitance value of the first capacitor Cp. The value of Cp is typically specified by the Qi protocol, so the time factor controlling the charging of the resonator depends on the value of R1, and if R1 is large, the charging time will be relatively long. If the output of the receiving end is a resistive load, vout decreases from the moment t1, and the decreasing speed is related to the output capacitance and the resistive load of Vout. The time period from t1 to t2 in the product design is usually controlled to be about 100 us.
In the stage t 2-t 3, the first switch S1 is opened at the moment t2, the grid electrode G2 is set to be 1 through MOS driving, at the moment, the first MOS tube M1 and the third MOS tube M3 are opened, the second MOS tube M2 and the fourth MOS tube M4 are closed, and meanwhile, the second switch S2 is closed. After G2 is set to 1, a closed-loop under-damped oscillation loop formed by the first capacitor Cp, the transmitting coil Lp, the second MOS tube M2, and the fourth MOS tube M4 is formed, and the working state of the closed-loop under-damped oscillation loop is shown in fig. 5. The underdamped oscillation peak voltage is sampled by the detection module through the voltage division of the second resistor R2 and the third resistor R3, the peak voltages Qs1 and Qs2 are obtained through sampling, and the oscillation times N are counted, as shown in fig. 6. the output voltage Vout continues to drop after time t2, which can be controlled to be around 600us in the product design.
In the stage t 3-t 4, the second switch S2 is closed at the moment t3 to prevent the Qs port from being over-pressed, the grid electrodes G1-G4 restore the original switching frequency, wherein Vin is reduced in a certain amplitude in the period t 1-t 3, and the period t 3-t 4 is slowly increased and the output loop control is completed by the Qi protocol. As the power transfer is resumed, the output voltage Vout starts to rise gradually. After t3, typically several hundred milliseconds are required for Vout, iout to reach rated output and the system resumes its original high power state of charge. Meanwhile, the software at the t3 stage calculates a Q value according to the underdamped oscillation peak voltage obtained by sampling, and the Q value is calculated by the following formula:
where N is the oscillation frequency, and Qs1 and Qs2 are peak voltages.
As can be seen from the charging sequence, the interruption time required for the Q value detection of the present embodiment is t1 to t3. The time length of the charging interruption can be controlled to be about 1ms, and the influence on the user experience of high-power wireless charging is very little. After the Q value is obtained, the Q value and the corresponding threshold value are determined, so that it can be directly determined whether there is a foreign object, and further, other actions can be performed, for example, whether to stop charging, whether to reduce transmission power, and the like.
Correspondingly, according to the detection of the Q value of the wireless charging interruption, information can be sent to the receiving end to prompt the next action before the detection is started between the interruption Q, the post-stage system of the receiving end can be correspondingly adjusted, for example, the post-stage switched capacitor converter (switch capacitor transformer, SC) can close the low-current protection in advance, for example, the post-stage buck converter can reduce the charging power in a short time, and the like.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
Further, the units described as separate units may or may not be physically separate, and units displayed as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
Furthermore, functional modules in various embodiments of the present application may be integrated together to form a single portion, or each module may exist alone, or two or more modules may be integrated to form a single portion.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The foregoing is merely exemplary embodiments of the present application and is not intended to limit the scope of the present application, and various modifications and variations may be suggested to one skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.
Claims (5)
1. The wireless charging circuit is characterized by comprising a transmitting end circuit and a receiving end circuit;
the transmitting end circuit comprises a transmitting end resonant network and an inverter circuit, and the output end of the inverter circuit is connected with the input end of the transmitting end resonant network;
the transmitting end resonant network comprises a transmitting coil and a first capacitor which are connected in series;
an excitation circuit is connected between the transmitting coil and the first capacitor and is used for charging the transmitting end resonant network;
a detection circuit is further connected between the transmitting coil and the first capacitor and is used for detecting the underdamped oscillation peak voltage and counting the number of times of interval oscillation of a closed-loop underdamped oscillation loop comprising the transmitting coil and the first capacitor; the detection results of the underdamped oscillation peak voltage detection and the interval oscillation frequency counting are used for calculating the Q value representing the wireless charging FOD.
2. The circuit of claim 1, wherein the inverter circuit comprises a full-bridge inverter circuit consisting of a first MOS transistor, a second MOS transistor, a third MOS transistor, and a fourth MOS transistor;
the S electrode of the first MOS tube is connected to the D electrode of the second MOS tube, the S electrode of the third MOS tube is connected to the D electrode of the fourth MOS tube, and the S electrodes of the second MOS tube and the fourth MOS tube are grounded; the S electrode of the first MOS tube is also connected to one end of the transmitting coil, and the S electrode of the third MOS tube is also connected to one end of the first capacitor;
when the second MOS tube and the fourth MOS tube are closed and the first MOS tube and the third MOS tube are opened, the transmitting coil, the first capacitor, the second MOS tube and the fourth MOS tube form the closed-loop under-damped oscillation loop.
3. The circuit of claim 2, wherein the excitation circuit comprises a first resistor, a first switch, and an excitation power supply in series, a negative terminal of the excitation power supply being grounded;
and when the first switch is closed, the first resistor and the excitation power supply are used for controlling the energy of the transmitting end resonant network.
4. The circuit of claim 2, wherein the detection circuit comprises a second resistor, a third resistor, and a detection module;
the first end of the second resistor is connected in parallel between the transmitting coil and the first capacitor, and the second end of the second resistor is grounded after passing through the third resistor;
the two ends of the third resistor are connected with a second switch in parallel;
the second end of the second resistor is also connected to the detection module;
and when the second switch is closed, the detection module is used for collecting the peak voltage of the closed-loop under-damped oscillation loop and counting the oscillation times.
5. The circuit of claim 1, wherein the receiver circuit comprises a receiver resonant network and a rectifying circuit, an output of the receiver resonant network being connected to an input of the rectifying circuit.
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| CN202223598445.3U CN219086889U (en) | 2022-12-30 | 2022-12-30 | Wireless charging circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117895670A (en) * | 2024-03-15 | 2024-04-16 | 荣耀终端有限公司 | Charging circuit, electronic equipment and electronic equipment assembly |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117895670A (en) * | 2024-03-15 | 2024-04-16 | 荣耀终端有限公司 | Charging circuit, electronic equipment and electronic equipment assembly |
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