CN114123531A - Wireless charger is inhaled to ultra-thin magnetism - Google Patents
Wireless charger is inhaled to ultra-thin magnetism Download PDFInfo
- Publication number
- CN114123531A CN114123531A CN202111061580.1A CN202111061580A CN114123531A CN 114123531 A CN114123531 A CN 114123531A CN 202111061580 A CN202111061580 A CN 202111061580A CN 114123531 A CN114123531 A CN 114123531A
- Authority
- CN
- China
- Prior art keywords
- mcu
- circuit
- wireless charging
- magnetic
- resistor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
-
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
-
- 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
-
- 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
- H02J7/00032—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries characterised by data exchange
-
- 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
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides an ultrathin magnetic wireless charger which comprises an SOC (system on chip) single chip and a high-integration MCU (microprogrammed control unit) chip, wherein the high-integration MCU chip comprises a half-bridge/full-bridge power switch tube, a high-frequency resonant circuit, a modem and an MCU (microprogrammed control unit) signal processor, wherein the half-bridge/full-bridge power switch tube is used for transmitting a CS (circuit switching) signal to the MCU signal processor; the high-frequency resonance circuit is used for adjusting power; the modem is used for carrying out mobile phone communication with the MCU signal processor; the MCU signal processor is used for transmitting PWM and EN signals to the driving device, and the full-integrated single-chip SOC control technology is used in the invention, so that peripheral matching elements are reduced, the board space occupied by the PCB is saved, the product is small in size, light and thin, and convenient to carry, and the user experience is high.
Description
The invention relates to the technical field of wireless charging, in particular to an ultrathin magnetic-absorption wireless charger.
Background
At present, the release of apple iPhone 12 series has enabled the wireless charging market to begin warming back. Especially, the wireless charging technology of magnetism absorption that apple official released drives wireless charging accessories market towards the development of frivolous direction. Light, thin and small magnetic wireless charging accessories emerge like spring bamboo shoots after rain, and great benefits are brought to the whole industry.
Most wireless charger products on the market are limited by the topology of the scheme, and have the following problems: 1. due to the structure of the MCU + the drive + the MOS tube, a large amount of PCB space is occupied, and the realization of lightness and thinness of the wireless charger is limited; 2. the product development difficulty is high, the cost is high, and the marketing period is slow.
Disclosure of Invention
The invention provides an ultrathin magnetic wireless charger, which is used for solving the problems of small volume and light weight of a product, is compatible with a WPC QI V1.2.4 standard, supports 5-15W output, and adopts a fully integrated single chip SOC control technology; the product can be small in volume and light and thin.
The invention provides an ultrathin magnetic wireless charger which is characterized by comprising a fully integrated SOC chip controller: the magnetic charging circuit is used for magnetic charging circuit integration and charging control;
the MCU chip is characterized in that: the wireless power receiver is used for detecting and receiving a communication data packet of the wireless power receiver through the communication of the simulation instruction and the charging equipment, carrying out data communication and judging the charging state of the charging equipment;
half-bridge/full-bridge power switching tube: the detection circuit is used for an internal integrated circuit demodulation circuit and a voltage demodulation circuit to detect FOD foreign matters;
high-frequency resonance circuit: the MCU chip is used for filtering interference signals when the MCU chip is used for data communication;
a modem: and the MCU chip is used for carrying out digital signal demodulation and conversion when carrying out data communication.
As an embodiment of the technical solution, the wireless charging circuit further includes an operational amplifier, a switching diode, and an LED display;
the ground wire interface of the operational amplifier is connected with the public end interface of the MCU signal processor;
the switch diode is connected with the MCU signal processor and the LED display;
the LED display includes: and the first LED, the second LED and the third LED display are respectively connected with the LED port of the MCU signal processor.
As an embodiment of the present technical solution, the operational amplifier provides an amplified voltage signal to the MCU processor, and the operational amplifier includes a first operational amplifier and a second operational amplifier therein;
the operational amplifier also comprises a fourteenth resistor, an eighteenth resistor, a nineteenth resistor, a twentieth resistor, a twenty-first resistor, a twenty-second resistor, a thirty-second resistor and a thirty-third resistor, wherein the twenty-first resistor and the twenty-second resistor are connected in series, the twenty-first resistor is a discharge resistor and used for providing voltage for the operational amplifier circuit, and the twenty-second resistor is a voltage-reducing current-limiting resistor and used for reducing the voltage in the operational amplifier circuit and limiting extra current.
As an embodiment of the present technical solution, the switching diode is used for controlling charging and powering off of a charger; wherein
When the charger is controlled to be charged, the resistor is in a low-resistance state, and the switching diode is used as a switch-on switch in the whole circuit;
when the charger is controlled to be powered off, the resistor is in a high-resistance state, and the switching diode is used as a disconnecting switch of the circuit.
As an embodiment of the present solution, in that the LED display comprises,
the first LED is used for carrying out circuit temperature early warning, and when the circuit temperature is not in the threshold range, the first LED flashes to warn;
the second LED is used for warning normal connection of the circuit, and when each element in the circuit works normally, the second LED lights;
and the third LED is used for voltage and current limitation warning, and the third LED flashes when the current and the voltage in the circuit exceed or are lower than the rated current and voltage values.
As an embodiment of the present technical solution, the MCU signal processor further includes an LDO and a driving device;
the LDO is used for receiving power input signals and carrying out voltage stabilization processing on the received power input signals, so that voltage is suitable for the MCU signal processor, then voltage signals after stabilization are sent to the MCU signal processor, the MCU signal processor outputs EN and PWM signals, the EN signals drive the PWM signals to be transferred to the driving device, and the driving device completes driving processing on the signals and sends the signals to the half-bridge/full-bridge switch.
As an embodiment of the present technical solution, the specific steps of signal transmission among the LDO, the MCU processor, the driving apparatus, and the half-bridge/full-bridge power switch tube are as follows:
the method comprises the following steps: an input power signal is transmitted to the LDO;
step two: the LDO transmits the stabilized voltage signal to the MCU processor;
step three: the MCU processor is used for preprocessing the voltage signal after voltage stabilization, boosting the PWM signal according to the EN signal and inputting the PWM signal to the driving device;
step four: and after the driving device receives the EN signal, the on and off signals of the charger are sent to the half-bridge/full-bridge power switch tube, so that the on and off states of the circuit are controlled.
As an embodiment of the present technical solution, the communication between the MCU chip and the receiver includes the following operation steps:
the method comprises the following steps: the receiver sends a communication data packet to the MCU chip;
step two: the MCU chip decodes the received communication data packet in real time;
step three: the MCU chip changes the oscillation frequency or the duty ratio of the coil by using a PID control algorithm on the decoded signal;
step four: the MCU chip sends the adjusted output power of the coil to the receiver;
step five: and after receiving the indication data packet of the charging full state of the MCU chip, the receiver sends the indication data packet to the MCU chip again, and the MCU chip stops power transmission.
As an embodiment of the technical solution, the charger further comprises an electromagnetic conversion mode, and the electromagnetic conversion mode comprises a wireless charging transmitting end and a wireless charging receiving end, wherein the wireless charging transmitting end and the wireless charging receiving end comprise magnetism isolating sheets;
the specific steps of the electromagnetic transformation are as follows:
the method comprises the following steps: after the wireless charging receiving terminal is electrified, the wireless charging transmitting terminal sends the generated electromagnetic signal to a magnetic isolation sheet of the wireless charging receiving terminal;
step two: after the magnetism isolating sheet of the wireless charging transmitting end receives the electromagnetic signal, the magnetic field of the electromagnetic signal is strengthened;
step three: the magnetism isolating sheet of the wireless charging transmitting terminal sends the reinforced electromagnetic signal to the magnetism isolating sheet of the wireless charging receiving terminal;
step four: the magnetic shielding sheet of the wireless charging receiving end guides and folds the electromagnetic signals and sends the folded electromagnetic signals to the wireless charging receiving end;
step five: the wireless charging receiving end converts the received electromagnetic signals into current, and therefore the battery is charged.
As an embodiment of the technical solution, the magnetic shield sheet is formed by the following principle,
the magnetic separation sheet is used for magnetic conduction, and the wireless charging transmitting end generates a magnetic field with constantly changing strength in a working state;
the magnetic separation sheet guides the magnetism of a magnetic field of the wireless charging transmitting end and is used for converting the energy of the magnetic field into electric energy at the wireless charging receiving end as much as possible;
the magnetic field of the wireless charging receiving end is guided to the middle through the magnetism isolating sheet to be folded;
the magnetic shielding sheet provides a closed magnetic line loop at the wireless charging transmitting end and the wireless charging receiving end;
the closed magnetic line loop can generate an eddy current effect under the condition that metal is close to the closed magnetic line loop, the eddy current effect can generate changed current, the changed current causes the change of magnetic flux through the principle that I is BS, and the magnetism isolating sheet is used for blocking the change of the magnetic flux caused by the metal.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of an ultra-thin magnetic wireless charger according to an embodiment of the present invention;
FIG. 2 is a connection diagram of various devices in an embodiment of the present invention;
FIG. 3 is a schematic diagram of an MCU processor circuit board according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of an operational amplifier according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a switching diode circuit according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of an LED display circuit according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
The embodiment of the invention provides an ultrathin magnetic wireless charger which is characterized by comprising
Fully integrated SOC chip controller: the magnetic charging circuit is used for magnetic charging circuit integration and charging control;
the MCU chip is characterized in that: the wireless power receiver is used for detecting and receiving a communication data packet of the wireless power receiver through the communication of the simulation instruction and the charging equipment, carrying out data communication and judging the charging state of the charging equipment;
half-bridge/full-bridge power switching tube: the detection circuit is used for an internal integrated circuit demodulation circuit and a voltage demodulation circuit to detect FOD foreign matters;
high-frequency resonance circuit: the MCU chip is used for filtering interference signals when the MCU chip is used for data communication;
a modem: the MCU chip is used for carrying out data communication and carrying out digital signal demodulation and conversion;
the working principle of the technical scheme is as follows: the MCU signal processor and the high-frequency resonance circuit are mutually connected with the modem and the half-bridge/full-bridge power switch tube, mobile phone communication is carried out between the MCU signal processor and the modem for transmitting demodulated and processed information, the half-bridge/full-bridge power switch tube transmits a CS signal to the MCU signal processor after receiving input voltage and current, the MCU signal processor transmits processed PWM and EN signals to the driving device and then transmits the processed PWM and EN signals to the half-bridge/full-bridge power switch tube through the driving device, the half-bridge/full-bridge power switch tube transmits current and voltage signals to the high-frequency resonance circuit, and then the high-frequency resonance circuit transmits the signals to the modem, complete signal transmission is completed in the process, and the MCU chip detects the wireless power receiver through analog ping and establishes communication with the receiver, then, the communication data packet sent from the receiver is decoded in real time, and the oscillation frequency or the duty ratio of the coil is changed by using a PID control algorithm, so that the output power on the coil is adjusted to meet the requirement of the receiver. Until receiving a charging full state indication data packet sent by a receiver, the MCU terminates power transmission;
the beneficial effects of the above technical scheme are: the magnetic suction wireless quick charging supports 5-15W output, a full-bridge power MOSFET is integrated in a chip, and FOD foreign matter detection is supported; the input withstand voltage of the chip is up to 20V, and the charging efficiency of the system is up to 83%; A5V/200 mA buck converter and a 3.3V/100mA voltage stabilizing device are integrated on the chip to supply power for the wireless chip.
In one embodiment, the wireless charging circuit further comprises an operational amplifier, a switching diode, an LED display;
the ground wire interface of the operational amplifier is connected with the public end interface of the MCU signal processor;
the switch diode is connected with the MCU signal processor and the LED display;
the LED display includes: the first LED, the second LED and the third LED are respectively connected with the LED port of the MCU signal processor;
the working principle of the technical scheme is as follows: the operational amplifier amplifies the internal voltage and transmits an amplified voltage signal to the MCU signal processor, the switching diode receives a signal sent by the MCU signal processor and sends a switching-on or switching-off signal to the LED display, and the second LED is connected with the operational amplifier and the MCU signal processor to display the switching-on condition of a circuit;
the beneficial effects of the above technical scheme are: the circuit connection condition can be observed conveniently, and the circuit can be cut off or connected in real time through the switch diode, so that the circuit safety is ensured.
In one embodiment, the operational amplifier provides an amplified voltage signal to the MCU processor, the operational amplifier internally comprises a first operational amplifier and a second operational amplifier, the operational amplifier internally further comprises a fourteenth resistor R14, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a thirty-second resistor R32 and a thirty-third resistor R33, the twenty-first resistor R21 and the twenty-second resistor R22 are connected in series, the twenty-first resistor R21 is a discharge resistor for providing a voltage to the operational amplifier circuit, and the twenty-second resistor R22 is a buck current limiting resistor for reducing the voltage in the operational amplifier circuit and limiting an additional current. The working principle of the technical scheme is as follows: the two inputs of the operational amplifier comprise: an inverting input terminal, a non-inverting input terminal and an output terminal, when a voltage U-is applied between the inverting input terminal and a common terminal (the common terminal is a point where the voltage is zero and corresponds to a reference node in the circuit), and the actual direction of the voltage U is higher than that of the common terminal from the inverting input terminal, the actual direction of the output voltage U is directed from the common terminal to the output terminal, that is, the directions of the input voltage U + and the input voltage U + are opposite, when the input voltage U + is applied between the inverting input terminal and the common terminal, the actual directions of the U and the U + are exactly the same relative to the common terminal, the operational amplifier is powered by two power supplies and a single power supply, the operational amplifier circuit internally includes a fourteenth resistor R14, an eighteenth resistor R18, a nineteenth resistor R19, a twentieth resistor R20, a twenty-first resistor R21, a twenty-second resistor R22, a thirty-second resistor R32 and a thirty-third resistor R33) for operating the power supply, the output of the differential amplifier can be changed at two sides of zero voltage, the output can also be set to zero when the differential input voltage is zero, and the output is changed within a certain range between a power supply and the ground by adopting an operational amplifier powered by a single power supply;
the beneficial effects of the above technical scheme are: the voltage in the circuit is stably amplified, so that the voltage suitable for working is provided for the MCU chip.
In one embodiment, the switching diode is used to control the charger to charge and discharge,
when the charger is controlled to be charged, the resistor is in a low-resistance state, and the switching diode is used as a switch-on switch in the whole circuit;
when the charger is controlled to be powered off, the resistor is in a high-resistance state, and the switching diode is used as a disconnecting switch of the circuit;
the working principle of the technical scheme is as follows: the switching diode is turned on to be equivalent to the switch being closed (circuit being on) and turned off to be equivalent to the switch being opened (circuit being off), so that the diode can be used as a switch, as shown in fig. 5, since the switching diode has the characteristic of one-way conduction, is turned on under a forward bias, and has a small resistance in a turned-on state, about several tens to several hundreds of ohms; under reverse bias, the diode is in a cut-off state, the resistance of the diode is very large, and the diode is generally more than 10 mu m omega;
the beneficial effects of the above technical scheme are: the switching diode has the characteristics of high switching speed, small volume, long service life, high reliability and the like, and is widely applied to a switching circuit, a detection circuit, a high-frequency and pulse rectification circuit and an automatic control circuit of electronic equipment.
In one embodiment, the LED display includes: the first LED, the second LED and the third LED are respectively connected with the LED port of the MCU signal processor;
the first LED is used for carrying out circuit temperature early warning, and the first LED flashes to warn when the circuit temperature is not in a threshold range;
the second LED is used for warning normal connection of the circuit, and when each element in the circuit works normally, the second LED lights;
the third LED is used for voltage and current limit warning, and the third LED flashes when the current and the voltage in the circuit exceed or are lower than the rated current and voltage values;
the working principle of the technical scheme is as follows: the most important of the LED lamps is a light emitting diode, which is a semiconductor device capable of converting electric energy into a visible light source, and in the LED, a wafer is provided, which is composed of an N-type semiconductor and a P-type semiconductor, and the two parts are connected to form a P-N junction, so that the wafer is particularly important, electrons generate energy in a P region when current passes through the wafer, and then the light source is generated in the form of photons, which is the principle that the LED lamp can emit light;
the beneficial effects of the above technical scheme are: the LED lamp has long service life. Compared with other common lamps, the LED lamps in the common condition have very long service life which can reach more than 50000 hours; the LED lamp can adapt to environments of various states, a general energy-saving lamp is very easy to be damaged if being in a frequently-turned-on and turned-off state, and the LED lamp can adapt to the high-state working environment.
In one embodiment, the MCU signal processor further comprises an LDO, a driving device; the LDO is used for receiving a power input signal, stabilizing the received power input signal to enable the voltage to be suitable for the MCU signal processor, then sending the stabilized voltage signal to the MCU signal processor, outputting an EN signal and a PWM signal by the MCU signal processor, driving the PWM signal to be transferred into the driving device by the EN signal, and finishing the driving processing of the signal and sending the signal to the half-bridge/full-bridge switch by the driving device;
the working principle of the technical scheme is as follows: the LDO is a linear regulator which uses a transistor or FET operating in its linear region to subtract excess voltage from the applied input voltage to produce a regulated output voltage, such as that required for an MCU chip in the present invention to convert 5V to 3.3V, the droop voltage is the minimum of the difference between the input voltage and the output voltage required for the regulator to maintain the output voltage within 100mV above or below its nominal value;
the beneficial effects of the above technical scheme are: the traditional linear voltage stabilizer chip requires that the input voltage is higher than the output voltage by more than 2V-3V, otherwise the chip can not work normally, for example, 5V is converted into 3.3V, and the voltage difference between the input and the output is only 1.7V, so that the voltage required by the MCU chip can be realized by adopting the LDO voltage stabilizer to meet the requirement of the invention.
In one embodiment, the specific steps of signal transmission among the LDO, the MCU processor, the driving apparatus, and the half-bridge/full-bridge power switch tube are as follows:
the method comprises the following steps: an input power signal is transmitted to the LDO;
step two: the LDO transmits the stabilized voltage signal to the MCU processor;
step three: the MCU processor is used for preprocessing the voltage signal after voltage stabilization, boosting the PWM signal according to the EN signal and inputting the PWM signal to the driving device;
step four: after the driving device receives the EN signal, the on and off signals of a charger are sent to the half-bridge/full-bridge power switch tube, so that the on and off states of a circuit are controlled;
the working principle of the technical scheme is as follows: the MCU processor transmits the PWM signal to the drive device engineering, the PWM signal can control the MOS to carry out voltage control, the duty ratio change of the PWM in an MOS tube and the output weight voltage of the MOS tube can change, and the changed voltage meets the circuit requirement and is transmitted to the half-bridge/full-bridge power switch tube.
The beneficial effects of the above technical scheme are: optimizing PWM seeks to achieve minimum current harmonic distortion (THD), maximum voltage utilization, optimum efficiency, minimum torque ripple, and other specific optimization objectives
In one embodiment, the communication between the MCU chip and the receiver includes the following operation steps:
the method comprises the following steps: the receiver sends a communication data packet to the MCU chip;
step two: the MCU chip decodes the received communication data packet in real time;
step three: the MCU chip changes the oscillation frequency or the duty ratio of the coil by using a PID control algorithm on the decoded signal;
step four: the MCU chip sends the adjusted output power of the coil to the receiver;
step five: after receiving the MCU chip charging full state indication data packet, the receiver sends the data packet to the MCU chip again, and the MCU chip stops power transmission;
the working principle of the technical scheme is as follows: the MCU chip decodes the received communication data packet, so that the communication data packet respectively adjusts and controls the circuit voltage information, the rated output power and the function corresponding to the PID control algorithm in the form of a plurality of different voltage signals, power signals and control signals, thereby changing the oscillation frequency or the duty ratio of the coil, and transmitting the power meeting the output power threshold value to the receiver, thereby finishing the information communication between the two;
the beneficial effects of the above technical scheme are: the MCU signal processor and the receiver are convenient to transmit signals, and the signal transmission efficiency is improved.
In one embodiment, the charger further comprises an electromagnetic conversion mode, wherein the electromagnetic conversion mode comprises a wireless charging transmitting end and a wireless charging receiving end, and the wireless charging transmitting end and the wireless charging receiving end comprise magnetic separation sheets;
the specific steps of the electromagnetic transformation are as follows:
the method comprises the following steps: after the wireless charging receiving terminal is electrified, the wireless charging transmitting terminal sends the generated electromagnetic signal to a magnetic isolation sheet of the wireless charging receiving terminal;
step two: after the magnetism isolating sheet of the wireless charging transmitting end receives the electromagnetic signal, the magnetic field of the electromagnetic signal is strengthened;
step three: the magnetism isolating sheet of the wireless charging transmitting terminal sends the reinforced electromagnetic signal to the magnetism isolating sheet of the wireless charging receiving terminal;
step four: the magnetic shielding sheet of the wireless charging receiving end guides and folds the electromagnetic signals and sends the folded electromagnetic signals to the wireless charging receiving end;
step five: the wireless charging receiving end converts the received electromagnetic signals into current so as to charge the battery;
calculating the electromagnetic conversion power, wherein M represents the distance between the wireless charging transmitting end and the wireless charging receiving end, M represents the upper limit distance between the wireless charging transmitting end and the wireless charging receiving end,
the power of the wireless charging transmitting terminal is subjected to summation calculation:
electromagnetic energy radiation generated during charging:
wherein C isηIs a predefined constant of proportionality coefficient
In order to make the electromagnetic energy radiation of the wireless charger harmless to the safety of people, therefore, the electromagnetic energy generated in the charging process is restricted, and a given threshold value is not exceeded at any time point t in the charging cycle, namely:
the final charging effect is as follows:
the working principle of the technical scheme is as follows: the electric energy is transmitted by using the magnetic field generated between the coils, the medium of a wire is not needed, the wireless charging system mainly adopts an electromagnetic induction principle, energy is coupled through the coils to realize energy transmission, direct current output by the power management module is converted into high-frequency alternating current to be supplied to a wireless charging receiving end, energy is coupled through the 2 inductance coils, current output by the secondary coil is converted into direct current to charge a battery through a receiving and converting circuit, the changed magnetic field can generate a changed electric field, the changed electric field can generate a changed magnetic field, electromagnetic waves in the principle can be transmitted out, and the generation of induction voltage is related to the change of magnetic flux, so the changed magnetic field in the coils generates induction voltage, and the charging process is finished;
the beneficial effects of the above technical scheme are: the electromagnetic conversion power is calculated and electromagnetic energy radiation constraint is set, so that the electromagnetic conversion rate can be effectively improved, the harm of electromagnetic radiation to people can be prevented, the power transmission element is not exposed, the power transmission element cannot be corroded by moisture, oxygen and the like in the air, no contact exists, the danger of electric shock can be avoided, the mechanical abrasion and the flashover loss during connection and separation can be avoided, and the charger is durable.
In one embodiment, the magnetism isolating sheet is used for conducting magnetism, and the wireless charging transmitting end generates a magnetic field with constantly changing strength in a working state;
the magnetic separation sheet guides the magnetism of a magnetic field of the wireless charging transmitting end and is used for converting the energy of the magnetic field into electric energy at the wireless charging receiving end as much as possible;
the magnetic field of the wireless charging receiving end is guided to the middle through the magnetism isolating sheet to be folded;
the magnetic shielding sheet provides a closed magnetic line loop at the wireless charging transmitting end and the wireless charging receiving end;
the closed magnetic line loop can generate an eddy current effect under the condition that metal is close to the closed magnetic line loop, the eddy current effect can generate changed current, the changed current causes the change of magnetic flux through the principle that I is BS, and the magnetism isolating sheet is used for blocking the change of the magnetic flux caused by the metal.
The working principle of the technical scheme is as follows: the magnetism of keeping off of magnetism-isolating piece is through I BS change that realizes the magnetic flux, if be a monoblock metal, will produce the eddy current effect, influences the electric current in the circuit, and the change electric current also can lead to the change of magnetic flux, and the change of magnetic flux will influence wireless charger electromagnetic conversion's efficiency, through add magnetism-isolating piece at wireless charging transmitting terminal and the wireless receiving terminal that charges, thereby can make full use of magnetism-isolating piece stop the change of the magnetic flux that causes of being close to of outside metal.
The beneficial effects of the above technical scheme are: the magnetism isolating sheet plays a role of magnetic conduction at the wireless receiving end, provides a magnetic line loop for the magnetic field of the wireless transmitting end, and gathers the magnetic field so as to improve the conversion rate of the wireless receiving end; the eddy current can generate a large amount of heat, the principle of the eddy current is the same as that of an induction cooker, electric energy is converted into heat energy by using the eddy current effect, however, in an electronic product, heat is avoided as much as possible, excessive electric energy is consumed due to heat generation, high temperature can damage the electronic product, a coil in the magnetic isolation sheet generates high-frequency current, the coil can generate heat, in order to effectively conduct the heat generation of the coil and the heat generation of a circuit board, the coil, the magnetic isolation sheet and the circuit board are integrally packaged through low temperature and low voltage, so that a good heat dissipation effect can be achieved, a magnetic field is necessarily restrained, the magnetic field only acts on a receiving end coil as much as possible, other components are not influenced, and the magnetic isolation sheet can well meet the functions of magnetic conduction, magnetic blocking and heat dissipation.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. The utility model provides a wireless charger is inhaled to ultra-thin magnetism which characterized in that, includes the full integrated SOC chip controller: the magnetic charging circuit is used for magnetic charging circuit integration and charging control;
the MCU chip is characterized in that: the wireless power receiver is used for detecting and receiving a communication data packet of the wireless power receiver through the communication of the simulation instruction and the charging equipment, carrying out data communication and judging the charging state of the charging equipment;
half-bridge/full-bridge power switching tube: the detection circuit is used for an internal integrated circuit demodulation circuit and a voltage demodulation circuit to detect FOD foreign matters;
high-frequency resonance circuit: the MCU chip is used for filtering interference signals when the MCU chip is used for data communication;
a modem: and the MCU chip is used for carrying out digital signal demodulation and conversion when carrying out data communication.
2. The ultra-thin magnetic wireless charger of claim 1, wherein the wireless charging circuit further comprises an operational amplifier, a switching diode, an LED display;
the ground wire interface of the operational amplifier is connected with the public end interface of the MCU signal processor;
the switch diode is connected with the MCU signal processor and the LED display;
the LED display includes: and the first LED, the second LED and the third LED display are respectively connected with the LED port of the MCU signal processor.
3. The ultra-thin magnetic wireless charger of claim 2, wherein the operational amplifier provides an amplified voltage signal to the MCU processor, and the operational amplifier comprises a first operational amplifier and a second operational amplifier;
the operational amplifier also comprises a fourteenth resistor (R14), an eighteenth resistor (R18), a nineteenth resistor (R19), a twentieth resistor (R20), a twenty-first resistor (R21), a twenty-second resistor (R22), a thirty-second resistor (R32) and a thirty-third resistor (R33) which are connected in series, wherein the twenty-first resistor (R21) and the twenty-second resistor (R22) are connected in series, the twenty-first resistor (R21) is a discharge resistor used for providing voltage for the operational amplifier circuit, and the twenty-second resistor (R22) is a voltage-reducing current-limiting resistor used for reducing the voltage in the operational amplifier circuit and limiting extra current.
4. The ultra-thin magnetic wireless charger of claim 2, wherein the switching diode is used to control the charger to charge and shut down, wherein;
when the charger is controlled to be charged, the resistor is in a low-resistance state, and the switching diode is used as a switch-on switch in the whole circuit;
when the charger is controlled to be powered off, the resistor is in a high-resistance state, and the switching diode is used as a disconnecting switch of the circuit.
5. The ultra-thin magnetic wireless charger of claim 2,
the first LED is used for carrying out circuit temperature early warning, and when the circuit temperature is not in the threshold range, the first LED flashes to warn;
the second LED is used for warning normal connection of the circuit, and when each element in the circuit works normally, the second LED lights;
and the third LED is used for voltage and current limitation warning, and the third LED flashes when the current and the voltage in the circuit exceed or are lower than the rated current and voltage values.
6. The ultra-thin magnetic wireless charger of claim 1, wherein the MCU signal processor further comprises an LDO, a driving device;
the LDO is used for receiving power input signals and carrying out voltage stabilization processing on the received power input signals, so that voltage is suitable for the MCU signal processor, then voltage signals after stabilization are sent to the MCU signal processor, the MCU signal processor outputs EN and PWM signals, the EN signals drive the PWM signals to be transferred to the driving device, and the driving device completes driving processing on the signals and sends the signals to the half-bridge/full-bridge switch.
7. The ultra-thin magnetic wireless charger according to claim 6, wherein the specific steps of signal transmission among the LDO, the MCU processor, the driving device and the half-bridge/full-bridge power switch tube are as follows:
the method comprises the following steps: an input power signal is transmitted to the LDO;
step two: the LDO transmits the stabilized voltage signal to the MCU processor;
step three: the MCU processor is used for preprocessing the voltage signal after voltage stabilization, boosting the PWM signal according to the EN signal and inputting the PWM signal to the driving device;
step four: and after the driving device receives the EN signal, the on and off signals of the charger are sent to the half-bridge/full-bridge power switch tube, so that the on and off states of the circuit are controlled.
8. The ultra-thin magnetic wireless charger of claim 1, wherein the communication between the MCU chip and the receiver comprises the following operation steps:
the method comprises the following steps: the receiver sends a communication data packet to the MCU chip;
step two: the MCU chip decodes the received communication data packet in real time;
step three: the MCU chip changes the oscillation frequency or the duty ratio of the coil by using a PID control algorithm on the decoded signal;
step four: the MCU chip sends the adjusted output power of the coil to the receiver;
step five: and after receiving the indication data packet of the charging full state of the MCU chip, the receiver sends the indication data packet to the MCU chip again, and the MCU chip stops power transmission.
9. The ultra-thin magnetic wireless charger of claim 1, wherein the charger further comprises an electromagnetic conversion mode comprising a wireless charging transmitting terminal and a wireless charging receiving terminal, wherein the wireless charging transmitting terminal and the wireless charging receiving terminal comprise magnetic shielding sheets;
the specific steps of the electromagnetic transformation are as follows:
the method comprises the following steps: after the wireless charging receiving terminal is electrified, the wireless charging transmitting terminal sends the generated electromagnetic signal to a magnetic isolation sheet of the wireless charging receiving terminal;
step two: after the magnetism isolating sheet of the wireless charging transmitting end receives the electromagnetic signal, the magnetic field of the electromagnetic signal is strengthened;
step three: the magnetism isolating sheet of the wireless charging transmitting terminal sends the reinforced electromagnetic signal to the magnetism isolating sheet of the wireless charging receiving terminal;
step four: the magnetic shielding sheet of the wireless charging receiving end guides and folds the electromagnetic signals and sends the folded electromagnetic signals to the wireless charging receiving end;
step five: the wireless charging receiving end converts the received electromagnetic signals into current, and therefore the battery is charged.
10. The ultra-thin magnetic wireless charger of claim 9,
the magnetic separation sheet is used for magnetic conduction, and the wireless charging transmitting end generates a magnetic field with constantly changing strength in a working state;
the magnetic separation sheet guides the magnetism of a magnetic field of the wireless charging transmitting end and is used for converting the energy of the magnetic field into electric energy at the wireless charging receiving end as much as possible;
the magnetic field of the wireless charging receiving end is guided to the middle through the magnetism isolating sheet to be folded;
the magnetic shielding sheet provides a closed magnetic line loop at the wireless charging transmitting end and the wireless charging receiving end;
the closed magnetic line loop can generate an eddy current effect under the condition that metal is close to the closed magnetic line loop, the eddy current effect can generate changed current, the changed current causes the change of magnetic flux through the principle that I is BS, and the magnetism isolating sheet is used for blocking the change of the magnetic flux caused by the metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061580.1A CN114123531A (en) | 2021-09-10 | 2021-09-10 | Wireless charger is inhaled to ultra-thin magnetism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111061580.1A CN114123531A (en) | 2021-09-10 | 2021-09-10 | Wireless charger is inhaled to ultra-thin magnetism |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114123531A true CN114123531A (en) | 2022-03-01 |
Family
ID=80441380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111061580.1A Pending CN114123531A (en) | 2021-09-10 | 2021-09-10 | Wireless charger is inhaled to ultra-thin magnetism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114123531A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844152A (en) * | 2022-05-10 | 2022-08-02 | 湖南炬神电子有限公司 | Wireless charger with annular breathing lamp effect |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160072309A1 (en) * | 2014-09-10 | 2016-03-10 | Htc Corporation | Wireless power transmitter device and wireless power receiver device |
| CN106787265A (en) * | 2017-01-24 | 2017-05-31 | 深圳市同洁科技有限公司 | A kind of wireless charging device |
| CN110224466A (en) * | 2019-06-26 | 2019-09-10 | 广东技术师范大学 | A kind of smart phone wireless charger and its charging method |
| CN113054753A (en) * | 2020-05-14 | 2021-06-29 | 荣耀终端有限公司 | Wireless charging equipment and equipment to be charged |
-
2021
- 2021-09-10 CN CN202111061580.1A patent/CN114123531A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20160072309A1 (en) * | 2014-09-10 | 2016-03-10 | Htc Corporation | Wireless power transmitter device and wireless power receiver device |
| CN106787265A (en) * | 2017-01-24 | 2017-05-31 | 深圳市同洁科技有限公司 | A kind of wireless charging device |
| CN110224466A (en) * | 2019-06-26 | 2019-09-10 | 广东技术师范大学 | A kind of smart phone wireless charger and its charging method |
| CN113054753A (en) * | 2020-05-14 | 2021-06-29 | 荣耀终端有限公司 | Wireless charging equipment and equipment to be charged |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114844152A (en) * | 2022-05-10 | 2022-08-02 | 湖南炬神电子有限公司 | Wireless charger with annular breathing lamp effect |
| CN114844152B (en) * | 2022-05-10 | 2023-02-17 | 湖南炬神电子有限公司 | Wireless charger with annular breathing lamp effect |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US8217621B2 (en) | Frequency modulation type wireless power supply and charger system | |
| CN104813742B (en) | Supply voltage management | |
| CN202406025U (en) | Adjustable constant-current and temperature control soft protection switch power supply circuit | |
| CN102448211A (en) | LED (Light Emitting Diode) for drive circuit | |
| CN104703330A (en) | LED lamp power supply circuit | |
| CN114123531A (en) | Wireless charger is inhaled to ultra-thin magnetism | |
| TW200532965A (en) | Power management for battery powered appliances | |
| CN102548095A (en) | Lamp and driving circuit thereof | |
| CN210670677U (en) | High-power-factor stroboflash-free LED dimming circuit and device | |
| CN202565530U (en) | Wireless sensing charging flashlight | |
| CN104219855A (en) | Strobe-free LED constant-flow drive control circuit based on APFC | |
| CN202424283U (en) | Charger based on single-chip three-end TOP22X integrated chip | |
| CN202888813U (en) | Battery reverse connection preventing circuit of charger | |
| CN203912290U (en) | Intelligent control circuit for double-purpose illuminating lamp | |
| CN104039055B (en) | Double-purpose illuminating lamp intelligent control circuit | |
| US20220302732A1 (en) | Charging circuit and charging device | |
| CN201967220U (en) | LED (Light-emitting diode) constant current driving circuit device | |
| CN212305165U (en) | Concentrated power supply type load driving system | |
| CN211429568U (en) | LED light system | |
| CN104684177B (en) | optical coupler feedback full-voltage LED drive circuit and LED lighting equipment | |
| CN109039051B (en) | Cascade bus power supply's supplier | |
| CN205945516U (en) | Be applied to protection device who prevents constant current source leakage current of two -way power | |
| CN203722855U (en) | LED driving power | |
| CN111148300A (en) | High-frequency square wave metal halide lamp controller with two-way driving and control method thereof | |
| CN204498045U (en) | Phototube Coupling power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20220301 |
|
| RJ01 | Rejection of invention patent application after publication |