CN110611511B - Transmitter, receiver and wireless charging system - Google Patents
Transmitter, receiver and wireless charging system Download PDFInfo
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- CN110611511B CN110611511B CN201810620603.XA CN201810620603A CN110611511B CN 110611511 B CN110611511 B CN 110611511B CN 201810620603 A CN201810620603 A CN 201810620603A CN 110611511 B CN110611511 B CN 110611511B
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- 238000007600 charging Methods 0.000 title claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 129
- 238000006243 chemical reaction Methods 0.000 claims abstract description 72
- 230000001965 increasing effect Effects 0.000 claims abstract description 42
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 230000008878 coupling Effects 0.000 claims description 15
- 238000010168 coupling process Methods 0.000 claims description 15
- 238000005859 coupling reaction Methods 0.000 claims description 15
- 230000001939 inductive effect Effects 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 abstract description 8
- 230000006641 stabilisation Effects 0.000 abstract description 6
- 238000011105 stabilization Methods 0.000 abstract description 6
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000001976 improved effect Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010277 constant-current charging Methods 0.000 description 1
- 238000010281 constant-current constant-voltage charging Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G08—SIGNALLING
- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C17/00—Arrangements for transmitting signals characterised by the use of a wireless electrical link
- G08C17/02—Arrangements for transmitting signals characterised by the use of a wireless electrical link using a radio link
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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
-
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/0003—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain
- H04B1/0007—Software-defined radio [SDR] systems, i.e. systems wherein components typically implemented in hardware, e.g. filters or modulators/demodulators, are implented using software, e.g. by involving an AD or DA conversion stage such that at least part of the signal processing is performed in the digital domain wherein the AD/DA conversion occurs at radiofrequency or intermediate frequency stage
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/1607—Supply circuits
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Near-Field Transmission Systems (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of wireless charging, and provides a transmitter, a receiver and a wireless charging system. The transmitter includes a high-frequency wireless receiving device and a duty cycle adjusting circuit for decreasing the duty cycle when the wireless signal is a high-level signal and increasing the duty cycle when the wireless signal is a low-level signal. The receiver comprises a high-frequency wireless transmitting device, a sampling module and an analog-to-digital conversion module, wherein the sampling module is used for collecting a sampling voltage value and a reference voltage, when the duty ratio of a duty ratio regulating circuit of the transmitter is reduced, the sampling voltage value is reduced, when the duty ratio is increased, the sampling voltage value is increased, the analog-to-digital conversion module is used for receiving the sampling voltage value and the reference voltage, when the sampling voltage value is smaller than the reference voltage, a low level is output, and when the sampling voltage value is larger than the reference voltage, a high level is output. The output of the wireless charging system realizes voltage stabilization and constant current, improves the conversion efficiency and reduces the heating value.
Description
[ Field of technology ]
The present invention relates to the field of wireless charging technologies, and in particular, to a transmitter, a receiver, and a wireless charging system.
[ Background Art ]
Wireless charging technology, also known as inductive charging, contactless charging, etc., is a new type of charging technology that results from wireless power transfer technology. Wireless charging technology uses near field induction to transfer energy from a wireless charger (transmitter) to a device (receiver) to be charged, which uses the received energy to charge a battery and to power the operation of the device itself. Because the wireless charger and the charging equipment are coupled through inductance to transmit energy, no wire connection is needed, and the non-conductive contact can be exposed.
In the process of implementing the present invention, the inventors found that the related art has the following problems: the receiver is coupled to the energy of the transmitter and stores the energy into an energy storage device of the receiver, the energy storage device providing power to a load of the receiver. A common energy storage device is a lithium battery, and for lithium batteries, constant-current charging and constant-voltage charging are the most common charging modes, so that the voltage or current output by the receiver is required to be stable (i.e., maintained at a preset voltage value or current value). However, the voltage or current output by the receiver is related to the transmitting power of the transmitter, so that the voltage or current output by the receiver is stable, the receiver in the present stage mostly adopts a DC-DC boost or buck conversion circuit, and the conversion efficiency (i.e. the charging efficiency of the transmitter and the receiver) is reduced due to the addition of a DC-DC power device, and the heating value is increased.
[ Invention ]
In order to solve the technical problems, the embodiment of the invention provides a transmitter, a receiver and a wireless charging system, which are used for stabilizing voltage and constant current, improving conversion efficiency and reducing heating value.
In order to solve the technical problems, one technical scheme adopted by the embodiment of the invention is as follows: a method is provided.
In a first aspect, embodiments of the present invention disclose a transmitter wirelessly connected to a receiver, comprising:
A high-frequency wireless receiving device for receiving a wireless signal;
And the duty ratio adjusting circuit is connected with the high-frequency wireless receiving device and is used for reducing the duty ratio when the wireless signal is a high-level signal and increasing the duty ratio when the wireless signal is a low-level signal.
Further, the transmitter further includes:
The oscillator is connected with the duty ratio adjusting circuit and is used for generating a high-frequency wireless carrier signal;
And the power supply module is connected with the oscillator and the duty ratio regulating circuit and is used for supplying power to the oscillator and the duty ratio regulating circuit.
Further, the transmitter further includes:
The first driving circuit is connected with the power supply module and used for driving the high-frequency wireless carrier signal;
the transmitter resonant circuit is connected with the first driving circuit and is used for converting the high-frequency wireless carrier signal into high-frequency electromagnetic waves to radiate;
the second driving circuit is respectively connected with the duty ratio adjusting circuit and the power supply module and is used for improving the driving current of the first driving circuit;
And the current limiting circuit is positioned between the first driving circuit and the second driving circuit and used for limiting the maximum value of the driving current.
Further, the high-frequency wireless receiving apparatus includes:
The high-frequency wireless receiving circuit is connected with the duty ratio adjusting circuit, and the receiving antenna is connected with the high-frequency wireless receiving circuit; or alternatively
The infrared receiving circuit is connected with the duty ratio adjusting circuit, and the photosensitive receiving tube is connected with the infrared receiving circuit.
In a second aspect, an embodiment of the present invention discloses a transmitter wirelessly connected to a receiver, including a high frequency wireless receiving device, an oscillator, and a frequency conversion control circuit;
The high-frequency wireless receiving device is used for receiving wireless signals;
The oscillator is connected with the variable frequency control circuit and is used for generating a high-frequency wireless carrier signal;
the frequency conversion control circuit is also connected with the high-frequency wireless receiving device and is used for increasing the frequency of the high-frequency wireless carrier signal when the wireless signal is a high-level signal and reducing the frequency of the high-frequency wireless carrier signal when the wireless signal is a low-level signal.
In a third aspect, embodiments of the present invention disclose a receiver wirelessly connected to a transmitter for powering a load on which the transmitter is mounted, comprising:
A high-frequency wireless transmitting device for transmitting a wireless signal;
The sampling module is used for collecting a sampling voltage value and a reference voltage, when the duty ratio of the duty ratio regulating circuit of the transmitter is reduced, the sampling voltage value is reduced, and when the duty ratio is increased, the sampling voltage value is increased; and
The analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and is used for receiving the sampling voltage value and the reference voltage, outputting a low level when the sampling voltage value is smaller than the reference voltage, and outputting a high level when the sampling voltage value is larger than the reference voltage.
Further, the sampling module includes:
the voltage dividing circuit is respectively connected with the load and the analog-to-digital conversion module and is used for dividing the load voltage and providing the reference voltage for the analog-to-digital conversion module;
The current sampling circuit is respectively connected with the load and the analog-to-digital conversion module and comprises a current sampling resistor and a coupling resistor, wherein the coupling resistor is used for coupling the load voltage to the current sampling resistor line, and the current sampling circuit is used for providing the sampling voltage value for the analog-to-digital conversion module.
Further, the receiver further includes:
The receiver resonance circuit is used for inducing the high-frequency electromagnetic wave of the transmitter and converting the high-frequency electromagnetic wave into high-frequency vibration voltage;
the rectification circuit is connected with the receiver resonance circuit and used for rectifying the high-frequency vibration voltage into direct-current voltage;
and the filter circuit is connected with the rectifying circuit and is used for carrying out filter processing on the direct-current voltage.
Further, the high-frequency wireless transmitting device includes:
the high-frequency wireless transmitting circuit is connected with the analog-to-digital conversion module, and the transmitting antenna is connected with the high-frequency wireless transmitting circuit; or alternatively
The infrared transmitter is connected with the analog-to-digital conversion module, and the infrared transmitting LED is connected with the infrared transmitter.
In a fourth aspect, embodiments of the present invention disclose a receiver wirelessly connected to a transmitter for powering a load on which the transmitter is mounted, comprising:
A high-frequency wireless transmitting device for transmitting a wireless signal;
The sampling module is used for collecting a sampling voltage value and a reference voltage, when the frequency of a high-frequency wireless carrier signal of the frequency conversion control circuit of the transmitter is reduced, the sampling voltage value is reduced, and when the frequency of the high-frequency wireless carrier signal is increased, the sampling voltage value is increased; and
The analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and is used for receiving the sampling voltage value and the reference voltage, outputting a low level when the sampling voltage value is smaller than the reference voltage, and outputting a high level when the sampling voltage value is larger than the reference voltage.
In a fifth aspect, an embodiment of the present invention discloses a wireless charging system comprising:
A transmitter and said receiver as described above; or alternatively
Another transmitter as described above.
The beneficial effects of the invention are as follows: compared with the prior art, the embodiment of the invention provides a transmitter, a receiver and a wireless charging system. Receiving a wireless signal by a high-frequency wireless receiving device of a transmitter, wherein a duty ratio adjusting circuit is connected with the high-frequency wireless receiving device, when the wireless signal is a high-level signal, the duty ratio is reduced, and when the wireless signal is a low-level signal, the duty ratio is increased; the high-frequency wireless transmitting device of the receiver transmits wireless signals, the sampling module acquires sampling voltage values and reference voltage, when the duty ratio of the duty ratio regulating circuit of the transmitter is reduced, the sampling voltage values are reduced, when the duty ratio is increased, the sampling voltage values are increased, the analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and receives the sampling voltage values and the reference voltage, when the sampling voltage values are smaller than the reference voltage, low levels are output, and when the sampling voltage values are larger than the reference voltage, high levels are output. Or the high-frequency wireless receiving device of the transmitter receives the wireless signal, the oscillator is connected with the variable frequency control circuit to generate a high-frequency wireless carrier signal, the variable frequency control circuit is also connected with the high-frequency wireless receiving device, when the wireless signal is a high-level signal, the frequency of the high-frequency wireless carrier signal is increased, and when the wireless signal is a low-level signal, the frequency of the high-frequency wireless carrier signal is reduced; the high-frequency wireless transmitting device of the receiver is used for transmitting wireless signals, the sampling module is used for collecting sampling voltage values and reference voltages, when the frequency of a high-frequency wireless carrier signal of the frequency conversion control circuit of the transmitter is reduced, the sampling voltage values are reduced, when the frequency of the high-frequency wireless carrier signal is increased, the sampling voltage values are increased, the analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and used for receiving the sampling voltage values and the reference voltages, when the sampling voltage values are smaller than the reference voltages, low levels are output, and when the sampling voltage values are larger than the reference voltages, high levels are output. Therefore, the output of the wireless charging system realizes voltage stabilization and constant current, improves the conversion efficiency and reduces the heating value.
[ Description of the drawings ]
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the present invention;
Fig. 2 is a schematic structural diagram of a transmitter according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a transmitter according to another embodiment of the present invention;
fig. 4 is a schematic circuit connection diagram of a transmitter according to an embodiment of the present invention;
Fig. 5 is a schematic circuit diagram of a transmitter according to another embodiment of the present invention;
Fig. 6 is a schematic structural diagram of a transmitter according to another embodiment of the present invention;
Fig. 7 is a schematic structural diagram of a transmitter according to another embodiment of the present invention;
Fig. 8 is a schematic circuit diagram of a transmitter according to another embodiment of the present invention;
fig. 9 is a schematic structural diagram of a receiver according to an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a receiver according to another embodiment of the present invention;
fig. 11 is a schematic circuit connection diagram of a receiver according to an embodiment of the present invention;
fig. 12 is a schematic circuit diagram of a receiver according to another embodiment of the present invention.
[ Detailed description ] of the invention
In order that the application may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the application described below can be combined with one another as long as they do not conflict with one another.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the invention. As shown in fig. 1, the wireless charging system 300 includes a transmitter 100 and a receiver 200, and the transmitter 100 is wirelessly connected with the receiver 200.
It will be appreciated that the transmitter 100 is located in a charging device, the transmitter 100 may be connected to a power grid or a dc power source, the receiver 200 is located in a device to be charged, the receiver 200 may be mounted in an electronic device to be charged, to provide wireless charging for the electronic device, where the electronic device includes various large, medium, and small power electronic devices such as an electric automobile, an underwater ship, a mobile phone, a home appliance, and the like. For example, when the wireless charging system 300 is applied to a mobile phone, the transmitter 100 is located at a charging stand, the receiver 200 is mounted on the mobile phone, and no data connection line exists between the charging stand and the mobile phone.
At this stage, there are four different ways of wireless charging: in the embodiment of the present invention, the transmitter 100 and the receiver 200 are preferably in an electromagnetic induction manner, an electromagnetic resonance manner, an electromagnetic coupling manner, and a radio wave manner, and the distance between the transmitter 100 and the receiver 200 may be between 5cm and 10cm, which depends on the transmission power of the transmitter 100, the conversion efficiency of the receiver 200, and so on. When the transmitter 100 and the receiver 200 adopt electromagnetic resonance, the specifications of the transmitter 100 coil and the receiver 200 coil are completely matched, the transmitter 100 coil generates a magnetic field after being electrified, and the receiver 200 coil resonates accordingly, and generates current.
Referring to fig. 2, the transmitter 100 includes a high frequency wireless receiving device 10 and a duty cycle adjusting circuit 20.
The high-frequency wireless receiving device 10 is used for receiving wireless signals. Referring to fig. 4 and 5, the high-frequency wireless receiving apparatus 10 includes a high-frequency wireless receiving circuit 101 and a receiving antenna 102, the high-frequency wireless receiving circuit 101 is connected to the duty ratio adjusting circuit 20, and the receiving antenna 102 is connected to the high-frequency wireless receiving circuit 101. Or the high-frequency wireless receiving device 10 comprises an infrared receiving circuit 103 and a photosensitive receiving tube 104, wherein the infrared receiving circuit 103 is connected with the duty ratio adjusting circuit 20, and the photosensitive receiving tube 104 is connected with the infrared receiving circuit 103.
The high-frequency wireless receiving circuit 101 may be a circuit formed by discrete components, or may be an integrated IC, and similarly, the infrared receiving circuit 103 may be a circuit formed by discrete components, or may be an integrated IC. The light-sensitive receiving tube 104 is also called an infrared receiving diode, and can well receive infrared light signals, but not receive light rays with other wavelengths, so that the accuracy and the sensitivity of receiving are ensured.
It will be appreciated that in the embodiment of the present invention, the wireless signal is an electromagnetic wave signal propagating in free space or depends on the electromagnetic wave signal as a carrier signal to transmit a target signal, and has two expression forms of high and low levels.
The duty cycle adjusting circuit 20 is connected to the high-frequency radio receiving apparatus 10, and is configured to decrease the duty cycle when the radio signal is a high-level signal, and to increase the duty cycle when the radio signal is a low-level signal.
In the embodiment of the present invention, the duty cycle adjusting circuit 20 includes an integrating circuit formed by a resistor and a capacitor, and the duty cycle adjusting circuit 20 further includes an internal logic control circuit. It can be understood that the integrating circuit is a circuit in which the output signal is proportional to the integral of the input signal, and is mainly used in occasions such as waveform conversion, elimination of offset voltage of the amplifying circuit, integral compensation in feedback control, and the like.
Specifically, the output voltage has a linear change from low to high through the integrating circuit formed by the resistor and the capacitor in the duty cycle adjusting circuit 20, and the output voltage is reduced by discharging the capacitor voltage to the ground through the resistor through the integrating circuit formed by the resistor and the capacitor in the duty cycle adjusting circuit 20.
Further, the internal logic control circuit determines that the duty ratio is low when the voltage is high, and the duty ratio is high when the voltage is low, and the voltage and the duty ratio can be changed according to a preset formula or can be changed linearly according to the calculation relation between the circuits. Thus, the effect of decreasing the duty ratio when the radio signal inputted to the duty ratio adjustment circuit 20 is a high level signal and increasing the duty ratio when the radio signal is a low level signal is obtained.
Referring to fig. 3, the transmitter 100 further includes an oscillator 30, a power module 40, a first driving circuit 50, a transmitter resonant circuit 60, a second driving circuit 70, and a current limiting circuit 80.
The oscillator 30 is connected to the duty cycle adjustment circuit 20 for generating a high frequency wireless carrier signal, typically an integrated electronic component. The oscillator 30 is an energy conversion device capable of converting dc power into ac power with a certain frequency, and the circuit formed by the energy conversion device is called an oscillating circuit, and can be used for generating repeated electronic signals, such as sine waves or square waves, etc., and is commonly known as a self-excited oscillator, a crystal oscillator, a harmonic oscillator, etc. Meanwhile, the oscillator 30 also determines the current resonance frequency of the transmitter 100.
The power module 40 is connected to the oscillator 30 and the duty cycle adjustment circuit 20, and is configured to provide power to the oscillator 30 and the duty cycle adjustment circuit 40. The power module 40 is configured to provide a dc voltage to supply power to the circuits or modules such as the duty cycle adjusting circuit 20, the oscillator 30, the first driving circuit 50, and the second driving circuit 70, and the common power voltages are 5V, 7V, 9V, 12V, etc., so the power module 40 may include a plurality of power sources with different voltages, and at this time, the power module 40 is a set of a plurality of power sources. Of course, the power module 40 may be a DC voltage-stabilizing power source that is converted from 220V AC mains supply to multiple outputs, at this time, the power module 40 may sequentially pass through a voltage transformation circuit, a rectification circuit, a filtering circuit, a switch selection circuit, a voltage-stabilizing circuit, etc. from 220V AC mains supply, or one of the branches of the power module 40 may sequentially pass through a voltage transformation circuit, an AC/DC circuit, a voltage-stabilizing circuit from 220V AC mains supply, and another branch may be expanded on the branch to sequentially pass through an AC/DC circuit, a DC/DC circuit, a control protection circuit, etc. from 220V AC mains supply. The above scheme of the power module 40 can all realize the conversion of 220V ac power into multiple dc outputs according to practical requirements.
The first driving circuit 50 is connected to the power module 40, and is configured to drive the high-frequency wireless carrier signal. The transmitter resonant circuit 60 is connected to the first driving circuit 50, and the transmitter resonant circuit 60 is configured to convert the high-frequency wireless carrier signal into a high-frequency electromagnetic wave and radiate the high-frequency electromagnetic wave. The second driving circuit 70 is connected to the duty ratio adjusting circuit 20 and the power module 40, respectively, for increasing the driving current of the first driving circuit 50. The current limiting circuit 80 is located between the first driving circuit 50 and the second driving circuit 70, for limiting the maximum value of the driving current.
Referring to fig. 4 or fig. 5, in the embodiment of the invention, the first driving circuit 50 includes a MOS transistor Q1 and a MOS transistor Q2, the transmitter resonant circuit 60 includes an inductor L1 and a capacitor C1, and the current limiting circuit 80 includes a resistor R1 and a resistor R2. The drain electrode of the MOS tube Q1 is connected with the power module 40 or is connected with an additional direct current power supply, the grid electrode of the MOS tube Q1 is connected with one end of the resistor R1, the source electrode of the MOS tube Q1 is connected with the drain electrode of the MOS tube Q2, the grid electrode of the MOS tube Q2 is connected with one end of the resistor R2, the source electrode of the MOS tube Q2 is connected with the ground end, one end of the inductor L1 is connected with the source electrode of the MOS tube Q1, the other end of the inductor L1 is connected with one end of the capacitor C1, the other end of the capacitor C1 is connected with the ground end, and the other end of the resistor R1 and the other end of the resistor R2 are respectively connected with the second driving circuit 70.
The inductance L1 and the capacitance C1 form a series resonant circuit, and at the same time, the inductance L1 is used as a transmitting coil, the resonant frequency is determined by the values of the inductance L1 and the capacitance C1, and it is understood that the current frequency of the transmitter resonant circuit 60 is determined by the oscillator 30. When the current frequency of the transmitter resonant circuit 60 is consistent with the resonant frequency of the series resonant circuit formed by the inductor L1 and the capacitor C1, the impedance of the series resonant circuit is minimum, so that the current flowing through the inductor L1 (the transmitting coil) is maximum, the generated alternating magnetic field is strongest, and the voltage induced by the receiving coil on the receiver 200 reaches the highest voltage.
It will be appreciated that the signal output from the oscillator 30 is only a square wave voltage signal with a high-low level conversion, and the current driving capability of the signal is very weak, and although the MOS transistors Q1 and Q2 are voltage driven, under the high-frequency driving signal, a distributed capacitance, i.e. a junction capacitance, exists between the GS poles of the MOS transistors Q1 and Q2, so that the driving signal charges and discharges the junction capacitance, and finally shows the change of the charging current and the discharging current. However, the rising edge and the falling edge of the square wave signal in the ideal case are as steep as possible, i.e. infinitely close to 90 degrees, so in order to accelerate the charging and discharging process of the junction capacitor, a driving circuit (i.e. the second driving circuit 70) must be added to increase the driving current, and the value of the driving current cannot be increased too much, so the current limiting circuit 80 is used to limit the maximum value of the driving current, so as to avoid the distortion of the driving waveform and damage to the MOS transistor caused by the excessive driving current.
Referring to fig. 9, the receiver 200 includes a high-frequency wireless transmitting device 201, a sampling module 202, and an analog-to-digital conversion module 203.
The high-frequency wireless transmitting device 201 is configured to transmit a wireless signal, and referring to fig. 11 and 12, the high-frequency wireless transmitting device 201 includes a high-frequency wireless transmitting circuit 2011 and a transmitting antenna 2012, the high-frequency wireless transmitting circuit 2011 is connected to the analog-to-digital conversion module 203, and the transmitting antenna 2012 is connected to the high-frequency wireless transmitting circuit 2011. Or the high-frequency wireless transmitting device 201 comprises an infrared emitter 2013 and an infrared emitting LED2014, wherein the infrared emitter 2013 is connected with the analog-to-digital conversion module 203, and the infrared emitting LED2014 is connected with the infrared emitter 2013.
In the embodiment of the present invention, the photosensitive receiving tube 104 is a phototransistor, and may be mounted on a housing of the transmitting coil L1 of the transmitter 100, the infrared transmitting LED2014 is mounted on a housing of the receiving coil L2 of the receiver 200, and when the photosensitive receiving tube 104 and the infrared transmitting LED2014 are in operation, no shielding exists, and the photosensitive receiving tube 104 may receive an infrared signal emitted by the infrared transmitting LED 2014.
The sampling module 202 is configured to collect a sampled voltage value and a reference voltage, wherein the sampled voltage value decreases when the duty cycle of the duty cycle adjustment circuit 20 of the transmitter 100 decreases, and the sampled voltage value increases when the duty cycle increases.
The sampling module 202 includes a voltage divider circuit 2021 and a current sampling circuit 2022. The voltage dividing circuit 2021 is connected to the load and the analog-to-digital conversion module 203, and is configured to divide the load voltage and provide the reference voltage to the analog-to-digital conversion module 203. The current sampling circuit 2022 is connected to the load and the analog-to-digital conversion module 203, respectively, the current sampling circuit 2022 includes a current sampling resistor and a coupling resistor, the coupling resistor is used to couple the load voltage to the current sampling resistor line, and the current sampling circuit 2022 is used to provide the sampled voltage value for the analog-to-digital conversion module 203.
In the embodiment of the present invention, the voltage divider circuit 2021 includes a resistor R3 and a resistor R4, and the current sampling circuit 2022 includes a current sampling resistor RI and a coupling resistor R5. One end of the resistor R3 is connected with the load, the other end of the resistor R3 is connected with one end of the resistor R4 and the analog-digital conversion module 203, and the other end of the resistor R4 is connected with the load. One end of the current sampling resistor RI is connected with the load, the other end of the current sampling resistor RI is connected with the filter circuit 206, one end of the coupling resistor R5 is connected with one end of the current sampling resistor RI and the load respectively, and the other end of the coupling resistor R5 is connected with the analog-digital conversion module 203 through a current sampling module.
The current sampling resistor RI is connected in series in a current loop of the load resistor RL, the resistance value of the current sampling resistor RI is generally 0.01 ohm to several ohms, the current flows from one end of the current sampling resistor RI close to the load to one end far away from the load, and meanwhile, the voltage of the current sampling resistor RI is proportional to the current. The coupling resistor R5 can couple the voltage on the load resistor RL to the current sampling line, and the value of the coupling resistor R5 is generally above 1K, so the current on the coupling resistor R5 line is very small and can be basically ignored.
The analog-to-digital conversion module 203 is respectively connected to the sampling module 202 and the high-frequency wireless transmitting device 201, and is configured to receive the sampled voltage value and the reference voltage, output a low level when the sampled voltage value is smaller than the reference voltage, and output a high level when the sampled voltage value is larger than the reference voltage.
Referring to fig. 10 to 12, the receiver 200 further includes a receiver resonant circuit 204, a rectifying circuit 205, and a filtering circuit 206.
The receiver resonant circuit 204 is used to sense the high frequency electromagnetic waves of the transmitter 100 and convert them to a dither voltage. The rectifying circuit 205 is connected to the receiver resonant circuit 204 for rectifying the dither voltage into a dc voltage. The filter circuit 206 is connected to the rectifier circuit 205, and is configured to filter the dc voltage.
In the embodiment of the present invention, the receiver resonant circuit 204 includes an inductance L2 and a capacitance C2, the rectifying circuit 205 is a full-wave rectifying bridge, and includes a diode D1, a diode D2, a diode D3, and a diode D4, and the filtering circuit 206 includes a capacitance C3. One end of the inductor L2 is connected with one end of the capacitor C2, the other end of the inductor L2 is connected with the cathode of the diode D2, the other end of the capacitor C2 is connected with the cathode of the diode D1, the capacitor C3 is a polar capacitor, the anode of the capacitor C3 is connected with the cathode of the diode D4, and the cathode of the capacitor C3 is connected with the ground.
The inductance L2 and the capacitance C2 form a series resonant circuit, meanwhile, the inductance L2 is used as a receiving coil, the resonant frequency is determined by the values of the inductance L2 and the capacitance C2, and the series resonant circuit formed by the inductance L2 and the capacitance C2 on the receiver 200 is the same as the resonant frequency of the series resonant circuit formed by the inductance L1 and the capacitance C1 of the transmitter 100.
In summary, the high-frequency wireless receiving device of the transmitter receives the wireless signal transmitted by the high-frequency wireless transmitting device of the receiver, when the wireless signal is a high-level signal, the duty cycle adjusting circuit receives the high-level signal, and controls the duty cycle to decrease, so that the transmitting power of the transmitter is reduced, the voltage received by the receiver is reduced accordingly, the sampling voltage value is reduced, when the sampling voltage value is smaller than the reference voltage, the analog-to-digital conversion module outputs a low-level signal, and the high-frequency wireless transmitting device connected with the analog-to-digital conversion module transmits the low-level signal; at this time, the high-frequency wireless transmitting device transmits a low-level signal, the high-frequency wireless receiving device receives the low-level signal, the duty ratio adjusting circuit connected with the high-frequency wireless receiving device receives the low-level signal, the duty ratio is controlled to be increased, so that the transmitting power of the transmitter is increased, the voltage received by the receiver is increased, the sampling voltage value is increased, when the sampling voltage value is larger than the reference voltage, the analog-to-digital conversion module outputs a high-level signal, and the high-frequency wireless transmitting device connected with the analog-to-digital conversion module transmits a high-level signal, so that the output voltage stabilization constant current is realized, and the conversion efficiency is improved and the heating value is reduced because a DC-DC power device is not used at the receiver end.
The embodiment of the invention provides a transmitter, a receiver and a wireless charging system. Receiving a wireless signal by a high-frequency wireless receiving device of a transmitter, wherein a duty ratio adjusting circuit is connected with the high-frequency wireless receiving device, when the wireless signal is a high-level signal, the duty ratio is reduced, and when the wireless signal is a low-level signal, the duty ratio is increased; the high-frequency wireless transmitting device of the receiver transmits wireless signals, the sampling module acquires sampling voltage values and reference voltage, when the duty ratio of the duty ratio regulating circuit of the transmitter is reduced, the sampling voltage values are reduced, when the duty ratio is increased, the sampling voltage values are increased, the analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and receives the sampling voltage values and the reference voltage, when the sampling voltage values are smaller than the reference voltage, low levels are output, and when the sampling voltage values are larger than the reference voltage, high levels are output. Therefore, the output of the wireless charging system realizes voltage stabilization and constant current, improves the conversion efficiency and reduces the heating value.
Referring to fig. 6, the transmitter 100 includes a high-frequency wireless receiving device 10, an oscillator 30, and a frequency conversion control circuit 90.
The high-frequency wireless receiving device 10 is configured to receive a wireless signal, the oscillator 30 is connected to the frequency conversion control circuit 90 and configured to generate a high-frequency wireless carrier signal, and the frequency conversion control circuit 90 is further connected to the high-frequency wireless receiving device 10 and configured to increase the frequency of the high-frequency wireless carrier signal when the wireless signal is a high-level signal and decrease the frequency of the high-frequency wireless carrier signal when the wireless signal is a low-level signal.
Referring to fig. 7 and 8, the transmitter 100 further includes a power module 40, a first driving circuit 50, a transmitter resonant circuit 60, a second driving circuit 70, and a current limiting circuit 80.
The power module 40 is connected with the oscillator 30, the first driving circuit 50 is connected with the power module 40 and is used for driving the high-frequency wireless carrier signal, the transmitter resonant circuit 60 is connected with the first driving circuit 50, the transmitter resonant circuit 60 is used for converting the high-frequency wireless carrier signal into high-frequency electromagnetic waves and radiating out, the second driving circuit 70 is respectively connected with the transmitter resonant circuit 60 and the power module 40 and is used for improving the driving current of the first driving circuit 50, and the current limiting circuit 80 is located between the first driving circuit 50 and the second driving circuit 70 and is used for limiting the maximum value of the driving current.
The above structures correspond to those described in the above embodiments, respectively, and are not described here again.
At this time, referring to fig. 9 again, the receiver 200 includes a high-frequency wireless transmitting device 201, a sampling module 202 and an analog-to-digital conversion module 203.
The high-frequency wireless transmitting device 201 is used for transmitting wireless signals; the sampling module 202 is configured to collect a sampling voltage value and a reference voltage, where the sampling voltage value decreases when the frequency of the high-frequency wireless carrier signal of the frequency conversion control circuit 90 of the transmitter 100 decreases, and the sampling voltage value increases when the frequency of the high-frequency wireless carrier signal increases; and the analog-to-digital conversion module 203 is respectively connected with the sampling module 202 and the high-frequency wireless transmitting device 201, and is configured to receive the sampled voltage value and the reference voltage, output a low level when the sampled voltage value is smaller than the reference voltage, and output a high level when the sampled voltage value is larger than the reference voltage.
Referring again to fig. 10, the receiver 200 further includes a receiver resonant circuit 204, a rectifying circuit 205, and a filtering circuit 206.
The receiver resonant circuit 204 is used to sense the high frequency electromagnetic waves of the transmitter 100 and convert them to a dither voltage. The rectifying circuit 205 is connected to the receiver resonant circuit 204 for rectifying the dither voltage into a dc voltage. The filter circuit 206 is connected to the rectifier circuit 205, and is configured to filter the dc voltage.
The above structures correspond to those described in the above embodiments, respectively, and are not described here again.
In summary, in the case that the duty ratio of the frequency conversion control circuit is unchanged, for example, the frequency is set to be 50%, the operating frequency (i.e., the frequency of the high-frequency wireless carrier signal) is changed, when the operating frequency is the same as the resonant frequency of the series resonant circuit formed by the inductor L1 and the capacitor C1, the impedance of the series resonant circuit formed by the inductor L1 and the capacitor C1 is minimum, the current of the transmitting coil L1 is maximum, and the voltage to which the receiving coil L2 is coupled is also maximum. When the operating frequency is different from the resonant frequency of the series resonant circuit formed by the inductor L1 and the capacitor C1, because of the resonant characteristic of the series resonant circuit formed by the inductor L1 and the capacitor C1, the series resonant circuit formed by the inductor L1 and the capacitor C1 generates a certain impedance to the operating frequency signal (i.e., the high-frequency wireless carrier signal), and the impedance increases with the increase of the operating frequency, so that the current of the transmitting coil L1 is reduced, and therefore, the alternating magnetic field generated by the transmitting coil L1 is also reduced, and the voltage coupled to the receiving coil L2 is also reduced; the impedance can be reduced along with the reduction of the working frequency, so that the current of L1 serving as a transmitting coil is increased, the alternating magnetic field generated by L1 is also increased, and the voltage coupled to the receiving coil L2 is also increased, so that the output voltage stabilization constant current is realized, and the conversion efficiency is improved and the heating value is reduced because a DC-DC power device is not used at a receiver end.
The embodiment of the invention provides a transmitter, a receiver and a wireless charging system. The high-frequency wireless receiving device of the transmitter is used for receiving the wireless signal, the oscillator is connected with the variable-frequency control circuit to generate a high-frequency wireless carrier signal, the variable-frequency control circuit is also connected with the high-frequency wireless receiving device, when the wireless signal is a high-level signal, the frequency of the high-frequency wireless carrier signal is increased, and when the wireless signal is a low-level signal, the frequency of the high-frequency wireless carrier signal is reduced; the high-frequency wireless transmitting device of the receiver is used for transmitting wireless signals, the sampling module is used for collecting sampling voltage values and reference voltages, when the frequency of a high-frequency wireless carrier signal of the frequency conversion control circuit of the transmitter is reduced, the sampling voltage values are reduced, when the frequency of the high-frequency wireless carrier signal is increased, the sampling voltage values are increased, the analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and used for receiving the sampling voltage values and the reference voltages, when the sampling voltage values are smaller than the reference voltages, low levels are output, and when the sampling voltage values are larger than the reference voltages, high levels are output. Therefore, the output of the wireless charging system realizes voltage stabilization and constant current, improves the conversion efficiency and reduces the heating value.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the invention, the steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (11)
1. The transmitter is characterized by being in wireless connection with a receiver, wherein the receiver comprises a high-frequency wireless transmitting device, a sampling module and an analog-to-digital conversion module, and the sampling module is used for collecting a sampling voltage value and a reference voltage of a load corresponding to the transmitter; the analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device, and is used for receiving the sampling voltage value and the reference voltage, outputting a low level when the sampling voltage value is smaller than the reference voltage so as to enable the high-frequency wireless transmitting device to transmit a low-level wireless signal, and outputting a high level when the sampling voltage value is larger than the reference voltage so as to enable the high-frequency wireless transmitting device to transmit a high-level wireless signal, and the transmitter comprises:
a high-frequency wireless receiving device for receiving the wireless signal;
And the duty ratio adjusting circuit is connected with the high-frequency wireless receiving device and is used for reducing the duty ratio when the wireless signal is a high-level signal and increasing the duty ratio when the wireless signal is a low-level signal.
2. The transmitter of claim 1, wherein the transmitter further comprises:
The oscillator is connected with the duty ratio adjusting circuit and is used for generating a high-frequency wireless carrier signal;
And the power supply module is connected with the oscillator and the duty ratio regulating circuit and is used for supplying power to the oscillator and the duty ratio regulating circuit.
3. The transmitter of claim 2, wherein the transmitter further comprises:
The first driving circuit is connected with the power supply module and used for driving the high-frequency wireless carrier signal;
the transmitter resonant circuit is connected with the first driving circuit and is used for converting the high-frequency wireless carrier signal into high-frequency electromagnetic waves to radiate;
the second driving circuit is respectively connected with the duty ratio adjusting circuit and the power supply module and is used for improving the driving current of the first driving circuit;
And the current limiting circuit is positioned between the first driving circuit and the second driving circuit and used for limiting the maximum value of the driving current.
4. The transmitter according to claim 1, wherein the high-frequency wireless receiving means comprises:
The high-frequency wireless receiving circuit is connected with the duty ratio adjusting circuit, and the receiving antenna is connected with the high-frequency wireless receiving circuit; or alternatively
The infrared receiving circuit is connected with the duty ratio adjusting circuit, and the photosensitive receiving tube is connected with the infrared receiving circuit.
5. The transmitter is characterized by being in wireless connection with a receiver, wherein the receiver comprises a high-frequency wireless transmitting device, a sampling module and an analog-to-digital conversion module, and the sampling module is used for collecting a sampling voltage value and a reference voltage of a load corresponding to the transmitter; the analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and is used for receiving the sampling voltage value and the reference voltage, outputting a low level when the sampling voltage value is smaller than the reference voltage so as to enable the high-frequency wireless transmitting device to transmit a low-level wireless signal, and outputting a high level when the sampling voltage value is larger than the reference voltage so as to enable the high-frequency wireless transmitting device to transmit a high-level wireless signal, and the transmitter comprises a high-frequency wireless receiving device, an oscillator and a frequency conversion control circuit;
The high-frequency wireless receiving device is used for receiving the wireless signals;
The oscillator is connected with the variable frequency control circuit and is used for generating a high-frequency wireless carrier signal;
the frequency conversion control circuit is also connected with the high-frequency wireless receiving device and is used for increasing the frequency of the high-frequency wireless carrier signal when the wireless signal is a high-level signal and reducing the frequency of the high-frequency wireless carrier signal when the wireless signal is a low-level signal.
6. A receiver wirelessly connected to a transmitter for powering a load on which the transmitter is mounted, the transmitter comprising a high frequency radio receiving device for receiving a radio signal, an oscillator for generating a high frequency radio carrier signal, and a duty cycle adjustment circuit for reducing a duty cycle when the radio signal is a high level signal, increasing the duty cycle when the radio signal is a low level signal, or a frequency conversion control circuit for increasing a frequency of the high frequency radio carrier signal when the radio signal is a high level signal, the receiver comprising:
A high-frequency wireless transmitting device for transmitting a wireless signal;
The sampling module is used for collecting a sampling voltage value and a reference voltage, when the duty ratio of the duty ratio regulating circuit of the transmitter is reduced, the sampling voltage value is reduced, and when the duty ratio is increased, the sampling voltage value is increased; and
The analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and is used for receiving the sampling voltage value and the reference voltage, outputting a low level when the sampling voltage value is smaller than the reference voltage, and outputting a high level when the sampling voltage value is larger than the reference voltage.
7. The receiver of claim 6, wherein the sampling module comprises:
the voltage dividing circuit is respectively connected with the load and the analog-to-digital conversion module and is used for dividing the load voltage and providing the reference voltage for the analog-to-digital conversion module;
The current sampling circuit is respectively connected with the load and the analog-to-digital conversion module and comprises a current sampling resistor and a coupling resistor, wherein the coupling resistor is used for coupling the load voltage to the current sampling resistor line, and the current sampling circuit is used for providing the sampling voltage value for the analog-to-digital conversion module.
8. The receiver of claim 7, wherein the receiver further comprises:
The receiver resonance circuit is used for inducing the high-frequency electromagnetic wave of the transmitter and converting the high-frequency electromagnetic wave into high-frequency vibration voltage;
the rectification circuit is connected with the receiver resonance circuit and used for rectifying the high-frequency vibration voltage into direct-current voltage;
and the filter circuit is connected with the rectifying circuit and is used for carrying out filter processing on the direct-current voltage.
9. The receiver of claim 6, wherein the high frequency wireless transmitting means comprises:
the high-frequency wireless transmitting circuit is connected with the analog-to-digital conversion module, and the transmitting antenna is connected with the high-frequency wireless transmitting circuit; or alternatively
The infrared transmitter is connected with the analog-to-digital conversion module, and the infrared transmitting LED is connected with the infrared transmitter.
10. A receiver wirelessly connected to a transmitter for powering a load on which the transmitter is mounted, the transmitter comprising a high frequency radio receiving device for receiving a radio signal, an oscillator for generating a high frequency radio carrier signal, and a duty cycle adjustment circuit for reducing a duty cycle when the radio signal is a high level signal, increasing the duty cycle when the radio signal is a low level signal, or a frequency conversion control circuit for increasing a frequency of the high frequency radio carrier signal when the radio signal is a high level signal, the receiver comprising:
A high-frequency wireless transmitting device for transmitting a wireless signal;
The sampling module is used for collecting a sampling voltage value and a reference voltage, when the frequency of a high-frequency wireless carrier signal of the frequency conversion control circuit of the transmitter is reduced, the sampling voltage value is reduced, and when the frequency of the high-frequency wireless carrier signal is increased, the sampling voltage value is increased; and
The analog-to-digital conversion module is respectively connected with the sampling module and the high-frequency wireless transmitting device and is used for receiving the sampling voltage value and the reference voltage, outputting a low level when the sampling voltage value is smaller than the reference voltage, and outputting a high level when the sampling voltage value is larger than the reference voltage.
11. A wireless charging system, comprising:
A transmitter as claimed in any one of claims 1 to 4 and a receiver as claimed in any one of claims 6 to 9; or alternatively
A transmitter as claimed in claim 5 and a receiver as claimed in claim 10.
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| CN112600540B (en) * | 2021-03-04 | 2021-05-14 | 上海南芯半导体科技有限公司 | High-precision comparator suitable for current demodulation in wireless charging |
| CN113611212B (en) * | 2021-07-30 | 2023-08-29 | 北京京东方显示技术有限公司 | Light receiving sensor, display panel, and electronic apparatus |
| CN116707160A (en) * | 2022-12-30 | 2023-09-05 | 荣耀终端有限公司 | Wireless charging control method and wireless charging system |
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