CN110611511A - Transmitter, receiver and wireless charging system - Google Patents
Transmitter, receiver and wireless charging system Download PDFInfo
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- CN110611511A CN110611511A CN201810620603.XA CN201810620603A CN110611511A CN 110611511 A CN110611511 A CN 110611511A CN 201810620603 A CN201810620603 A CN 201810620603A CN 110611511 A CN110611511 A CN 110611511A
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- 238000007600 charging Methods 0.000 title claims abstract description 35
- 238000005070 sampling Methods 0.000 claims abstract description 125
- 238000006243 chemical reaction Methods 0.000 claims abstract description 68
- 230000001965 increasing effect Effects 0.000 claims abstract description 39
- 230000008878 coupling Effects 0.000 claims description 13
- 238000010168 coupling process Methods 0.000 claims description 13
- 238000005859 coupling reaction Methods 0.000 claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000001939 inductive effect Effects 0.000 claims description 4
- 230000001976 improved effect Effects 0.000 abstract description 6
- 230000006641 stabilisation Effects 0.000 abstract description 4
- 238000011105 stabilization Methods 0.000 abstract description 4
- 239000003990 capacitor Substances 0.000 description 28
- 238000010586 diagram Methods 0.000 description 13
- 230000007423 decrease Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000004146 energy storage 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
- 238000007599 discharging Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004364 calculation method Methods 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
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 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
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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
- H04B1/02—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
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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
- H04B1/06—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 comprises a high-frequency wireless receiving device and a duty ratio adjusting circuit, wherein the duty ratio adjusting circuit 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. 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 reference voltage, when the duty ratio of a duty ratio adjusting 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, the conversion efficiency is improved, and the heat productivity is reduced.
Description
[ technical field ] A method for producing a semiconductor device
The invention relates to the technical field of wireless charging, in particular to a transmitter, a receiver and a wireless charging system.
[ background of the invention ]
Wireless charging technology, also known as inductive charging, non-contact charging, etc., is a new charging technology that is derived from wireless power transmission technology. The wireless charging technology uses near-field induction, and a wireless charger (transmitter) transmits energy to a device (receiver) to be charged, and the device charges a battery by using the received energy and provides energy for the operation of the device. Because the energy is transmitted between the wireless charger and the charging equipment through inductive coupling, no wire connection is needed, and no conductive contact can be exposed.
In the process of implementing the invention, the inventor finds that the following problems exist in the related art: the receiver is coupled with the energy of the transmitter and stores the energy into the energy storage device of the receiver, and the energy storage device supplies power for the load of the receiver. The common energy storage device is a lithium battery, and for the lithium battery, constant current charging and constant voltage charging are the most common charging methods, 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 transmission power of the transmitter, and in order to stabilize the voltage or current output by the receiver, a DC-DC step-up or step-down conversion circuit is mostly adopted by the receiver at the present stage, and due to the addition of a DC-DC power device, the conversion efficiency (i.e., the charging efficiency of the transmitter and the receiver) is reduced, and the heat productivity is increased.
[ summary of the invention ]
In order to solve the above technical problems, embodiments of the present invention provide a transmitter, a receiver, and a wireless charging system that stabilize voltage and stabilize current, improve conversion efficiency, and reduce heat generation.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is: provided is a method.
In a first aspect, an embodiment of the present invention discloses a transmitter, which is wirelessly connected to a receiver, including:
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 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 used for providing power for 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 a high-frequency electromagnetic wave to be radiated;
the second driving circuit is respectively connected with the duty ratio adjusting circuit and the power supply module and is used for increasing 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 is 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; alternatively, the first and second electrodes may be,
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, which is wirelessly connected to a receiver, and includes 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 frequency conversion 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, an embodiment of the present invention discloses a receiver, wirelessly connected to a transmitter, for supplying power to a load on which the transmitter is installed, including:
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 a 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 number of the first and second groups,
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 comprises:
the voltage division 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, the current sampling circuit respectively with the load with the analog-to-digital conversion module is connected, the current sampling circuit includes current sampling resistance and coupling resistance, coupling resistance is used for with load voltage couples to on the current sampling resistance circuit, the current sampling circuit be used for the analog-to-digital conversion module provides the sampling voltage value.
Further, the receiver further includes:
a receiver resonant circuit for inducing the high frequency electromagnetic wave of the transmitter and converting it into a high frequency vibration voltage;
the rectifying circuit is connected with the receiver resonant circuit and is 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 filtering the direct-current voltage.
Further, the high frequency wireless transmission apparatus 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; alternatively, the first and second electrodes may be,
the infrared emitter is connected with the analog-to-digital conversion module, and the infrared emitting LED is connected with the infrared emitter.
In a fourth aspect, an embodiment of the present invention discloses a receiver, wirelessly connected to a transmitter, for supplying power to a load on which the transmitter is installed, including:
a high-frequency wireless transmitting device for transmitting a wireless signal;
the sampling module is used for acquiring a sampling voltage value and a reference voltage, when the frequency of a high-frequency wireless carrier signal of a 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 number of the first and second groups,
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, including:
a transmitter and a receiver as described above; alternatively, the first and second electrodes may be,
a receiver as described above for another transmitter.
The invention has the beneficial effects that: compared with the prior art, the embodiment of the invention provides a transmitter, a receiver and a wireless charging system. The high-frequency wireless receiving device of the transmitter receives a wireless signal, the 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 a wireless signal, the sampling module collects a sampling voltage value and reference voltage, when the duty ratio of the duty ratio adjusting 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 respectively connected with the sampling module and the high-frequency wireless transmitting device to receive the sampling voltage value and the reference voltage, when the sampling voltage value is smaller than the reference voltage, the low level is output, and when the sampling voltage value is larger than the reference voltage, the high level is output. Or, the high-frequency wireless receiving device of the transmitter receives the wireless signal, the oscillator is connected with the frequency conversion control circuit to generate a high-frequency wireless carrier signal, and the frequency conversion 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 decreased; the high-frequency wireless transmitting device of the receiver is used for transmitting wireless signals, the sampling module collects sampling voltage values and reference voltage, when the frequency of high-frequency wireless carrier signals of a frequency conversion control circuit of the transmitter is reduced, the sampling voltage values are reduced, when the frequency of the high-frequency wireless carrier signals 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, the conversion efficiency is improved, and the heat productivity is reduced.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
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 diagram of a transmitter according to an embodiment of the present invention;
fig. 5 is a circuit connection 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 circuit connection 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 circuit connection diagram of a receiver according to an embodiment of the present invention;
fig. 12 is a circuit connection diagram of a receiver according to another embodiment of the present invention.
[ detailed description ] embodiments
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. 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 intervening elements may be present. 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. As used herein, the term "and/or" 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 present application described below may be combined with each other as long as they do not conflict with each other.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the present 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 to the receiver 200.
It can be understood that the transmitter 100 is located at a charging device, the transmitter 100 may be connected to a power grid side or a dc power supply, the receiver 200 is located at a device to be charged, the receiver 200 may be installed at an electronic device to be charged to provide wireless charging for the electronic device, and the electronic device includes various large, medium and small power electronic devices such as an electric vehicle, an underwater ship, a mobile phone, and a home appliance. For example, when the wireless charging system 300 is applied to a mobile phone, the transmitter 100 is located in a charging cradle, the receiver 200 is installed in the mobile phone, and no data connection line exists between the charging cradle and the mobile phone.
At present, there are four different ways for wireless charging: in the embodiment of the present invention, the transmitter 100 and the receiver 200 are preferably in an electromagnetic induction manner, and the distance between the transmitter 100 and the receiver 200 may be 5cm to 10cm, and particularly, how far away the distance is determined by the transmission power of the transmitter 100, the conversion efficiency of the receiver 200, and the like. When the transmitter 100 and the receiver 200 adopt an electromagnetic resonance mode, the specifications of the transmitter 100 coil and the receiver 200 coil are completely matched, a magnetic field is generated after the transmitter 100 coil is electrified, and the receiver 200 coil resonates to generate current.
Referring to fig. 2, the transmitter 100 includes a high-frequency wireless receiving apparatus 10 and a duty cycle adjusting circuit 20.
The high frequency wireless receiving apparatus 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 includes an infrared receiving circuit 103 and a photosensitive receiving tube 104, 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 composed of discrete components, or may also be an integrated IC, and similarly, the infrared receiving circuit 103 may be a circuit composed of discrete components, or may also be an integrated IC. The photosensitive receiving tube 104, also called an infrared receiving diode, can receive infrared light signals well, but does not receive light rays with other wavelengths, thereby ensuring the accuracy and sensitivity of receiving.
It is understood that, in the embodiment of the present invention, the wireless signal is an electromagnetic wave signal propagating in a free space or a target signal is transmitted by means of the electromagnetic wave signal as a carrier signal, and the wireless signal has two expressions of high and low levels.
The duty ratio adjusting circuit 20 is connected to the high frequency wireless receiving device 10, and is configured to decrease the duty ratio when the wireless signal is a high level signal, and increase the duty ratio when the wireless signal is a low level signal.
In the embodiment of the present invention, the duty ratio adjusting circuit 20 includes an integrating circuit composed of a resistor and a capacitor, and the duty ratio 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 the integrating circuit is mainly used for waveform transformation, cancellation of offset voltage of the amplifying circuit, integral compensation in feedback control, and the like.
Specifically, the high level signal passes through an integrating circuit formed by a resistor and a capacitor in the duty ratio adjusting circuit 20, the output voltage has a linear change from low to high, and the low level signal passes through the integrating circuit formed by the resistor and the capacitor in the duty ratio adjusting circuit 20, and the capacitor voltage is discharged to the ground through the resistor, so that the output voltage is reduced.
Further, the internal logic control circuit determines that when the voltage is high, the duty ratio is low, and when the voltage is low, the duty ratio is high, and the voltage and the duty ratio can be changed according to a preset formula or can be linearly changed according to a calculation relationship between circuits. Thus, the duty ratio is reduced when the wireless signal input to the duty ratio adjusting circuit 20 is a high level signal, and the duty ratio is increased when the wireless signal is a low level signal.
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 adjusting circuit 20, and is configured to generate a high-frequency wireless carrier signal, which is generally an integrated electronic component. The oscillator 30 is an energy conversion device that can convert dc power into ac power with a certain frequency, and the formed circuit is called an oscillation circuit, and can be used to generate repetitive electronic signals, such as sine waves or square waves, and is commonly known as a self-excited oscillator, a crystal oscillator, a harmonic oscillator, and the like. At the same time, 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 ratio adjusting circuit 20, and is configured to provide power to the oscillator 30 and the duty ratio adjusting circuit 40. The power module 40 is configured to provide a direct-current voltage to provide power for circuits or modules such as the duty ratio adjusting circuit 20, the oscillator 30, the first driving circuit 50, the second driving circuit 70, and the like, and the common power voltages are 5V, 7V, 9V, 12V, and the like, so that 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 the plurality of power sources. Of course, power module 40 can be the direct current regulated power supply who is converted into many outputs by 220V alternating current commercial power, and at this moment, power module 40 can be passed through transformer circuit, rectifier circuit, filter circuit, switch selection circuit and voltage stabilizing circuit etc. in proper order by 220V alternating current commercial power, or one of them branch road of power module 40 can be passed through filter circuit, transformer circuit, AC/DC circuit, voltage stabilizing circuit in proper order by 220V alternating current commercial power, can expand another branch road on this branch road and be passed through AC/DC circuit, DC/DC circuit and control protection circuit etc. in proper order by 220V alternating current commercial power. In the above embodiments, the power module 40 can convert 220V ac power into multiple dc outputs according to actual 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 to be radiated. The second driving circuit 70 is respectively connected to the duty ratio adjusting circuit 20 and the power module 40, and is configured to increase 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, and is used for limiting the maximum value of the driving current.
Referring to fig. 4 or 5, in the embodiment of the present 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 of the MOS transistor Q1 is connected to the power module 40, or is connected to an additional dc power supply, the gate of the MOS transistor Q1 is connected to one end of the resistor R1, the source of the MOS transistor Q1 is connected to the drain of the MOS transistor Q2, the gate of the MOS transistor Q2 is connected to one end of the resistor R2, the source of the MOS transistor Q2 is connected to ground, one end of the inductor L1 is connected to the source of the MOS transistor Q1, the other end of the inductor L1 is connected to one end of the capacitor C1, the other end of the capacitor C1 is connected to ground, and the other end of the resistor R1 and the other end of the resistor R2 are connected to the second driving circuit 70.
Wherein the inductor L1 and the capacitor C1 form a series resonant circuit, and the inductor L1 also serves as a transmitter coil, and the resonant frequency is determined by the values of the inductor L1 and the capacitor C1, it being 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 identical to 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 the smallest, and then the current flowing through the inductor L1 (transmitting coil) is the largest, the generated alternating magnetic field is the strongest, and the voltage induced by the receiving coil of the receiver 200 reaches the highest voltage.
It can be understood that the signal output from the oscillator 30 is only a high-low level converted square wave voltage signal, the current driving capability of the signal is very weak, and although the MOS transistor Q1 and the MOS transistor Q2 are voltage-driven, under a high-frequency driving signal, a distributed capacitance, i.e., a junction capacitance, exists between the GS poles of the MOS transistor Q1 and the MOS transistor Q2, so that the driving signal charges and discharges the junction capacitance, and finally, the change of the charging current and the discharging current is reflected. However, it is required that the rising edge and the falling edge of the square wave signal are as steep as possible in an ideal case, that is, infinitely close to 90 degrees, 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 of course, 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, and prevent the driving current from being too large to cause distortion of the driving waveform and damage to the MOS transistor.
Referring to fig. 9, the receiver 200 includes a high frequency wireless transmitter 201, a sampling module 202, and an analog-to-digital conversion module 203.
Referring to fig. 11 and 12, the high-frequency wireless transmitting device 201 is configured to transmit a wireless signal, where 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 includes an infrared emitter 2013 and an infrared emitting LED2014, the infrared emitter 2013 is connected to the analog-to-digital conversion module 203, and the infrared emitting LED2014 is connected to the infrared emitter 2013.
In the embodiment of the present invention, the photosensitive receiving tube 104 is a phototransistor, and can be mounted on the housing of the transmitting coil L1 of the transmitter 100, the infrared emitting LED2014 is mounted on the housing of the receiving coil L2 of the receiver 200, when in operation, there is no shielding between the photosensitive receiving tube 104 and the infrared emitting LED2014, and the photosensitive receiving tube 104 can receive the infrared signal emitted by the infrared emitting LED 2014.
The sampling module 202 is configured to collect a sampling voltage value and a reference voltage, where the sampling voltage value decreases when the duty ratio of the duty ratio adjusting circuit 20 of the transmitter 100 decreases, and the sampling voltage value increases when the duty ratio increases.
The sampling module 202 includes a voltage divider circuit 2021 and a current sampling circuit 2022. The voltage dividing circuit 2021 is respectively 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 for 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, and the current sampling circuit 2022 includes a current sampling resistor and a coupling resistor, the coupling resistor is configured to couple the load voltage to the current sampling resistor line, and the current sampling circuit 2022 is configured to provide the sampled voltage value to 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 to the load, the other end of the resistor R3 is connected to one end of the resistor R4 and the analog-to-digital conversion module 203, and the other end of the resistor R4 is connected to the load. One end of the current sampling resistor RI is connected to the load, the other end of the current sampling resistor RI is connected to the filter circuit 206, one end of the coupling resistor R5 is connected to one end of the current sampling resistor RI and the load, respectively, and the other end of the coupling resistor R5 is connected to the analog-to-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 direction of 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 in direct proportion 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 that the current of the coupling resistor R5 line is very small and can be ignored basically.
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 sampling voltage value and the reference voltage, output a low level when the sampling voltage value is smaller than the reference voltage, and output a high level when the sampling 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 induce the high frequency electromagnetic waves of the transmitter 100 and convert them into a high frequency vibration voltage. The rectifier circuit 205 is connected to the receiver resonant circuit 204, and is configured to rectify 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 inductor L2 and a capacitor C2, the rectifying circuit 205 is a full-wave rectifying bridge including a diode D1, a diode D2, a diode D3 and a diode D4, and the filter circuit 206 includes a capacitor 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 end.
The inductor L2 and the capacitor C2 form a series resonant circuit, the inductor L2 also serves as a receiving coil, the resonant frequency is determined by the values of the inductor L2 and the capacitor C2, and the series resonant circuit formed by the inductor L2 and the capacitor C2 on the receiver 200 has the same resonant frequency as the series resonant circuit formed by the inductor L1 and the capacitor 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 ratio adjusting circuit receives the high-level signal, and controls the duty ratio to decrease, so that the transmitting power of the transmitter decreases, therefore, the voltage received by the receiver also decreases, the sampling voltage value decreases, 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 to the analog-to-digital conversion module transmits the low-level signal; at this moment, 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 and controls the duty ratio to increase, so that the transmitting power of the transmitter is increased, the voltage received by the receiver is increased accordingly, 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 voltage-stabilizing constant current of the output is realized, and because a DC-DC power device is not used at the receiver end, the conversion efficiency is improved, and the.
The embodiment of the invention provides a transmitter, a receiver and a wireless charging system. The high-frequency wireless receiving device of the transmitter receives a wireless signal, the 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 a wireless signal, the sampling module collects a sampling voltage value and reference voltage, when the duty ratio of the duty ratio adjusting 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 respectively connected with the sampling module and the high-frequency wireless transmitting device to receive the sampling voltage value and the reference voltage, when the sampling voltage value is smaller than the reference voltage, the low level is output, and when the sampling voltage value is larger than the reference voltage, the high level is output. Therefore, the output of the wireless charging system realizes voltage stabilization and constant current, the conversion efficiency is improved, and the heat productivity is reduced.
Referring to fig. 6, the transmitter 100 includes a high frequency wireless receiving apparatus 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 to the oscillator 30, the first driving circuit 50 is connected to the power module 40 for driving the high-frequency wireless carrier signal, the transmitter resonant circuit 60 is connected to the first driving circuit 50, the transmitter resonant circuit 60 is used for converting the high-frequency wireless carrier signal into a high-frequency electromagnetic wave to be radiated, the second driving circuit 70 is connected to the transmitter resonant circuit 60 and the power module 40 for increasing 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 for limiting the maximum value of the driving current.
The above structures correspond to the structures described in the above embodiments, and are not described again here.
At this time, correspondingly, 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 is decreased when the frequency of the high-frequency wireless carrier signal of the frequency conversion control circuit 90 of the transmitter 100 is decreased, and the sampling voltage value is increased when the frequency of the high-frequency wireless carrier signal is increased; 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 induce the high frequency electromagnetic waves of the transmitter 100 and convert them into a high frequency vibration voltage. The rectifier circuit 205 is connected to the receiver resonant circuit 204, and is configured to rectify 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 the structures described in the above embodiments, and are not described again here.
In summary, under the condition that the duty ratio is not changed, for example, set to 50%, the frequency conversion control circuit changes the operating frequency (i.e., the frequency of the high-frequency wireless carrier signal), 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 electrical impedance of the series resonant circuit formed by the inductor L1 and the capacitor C1 is the smallest, and the current of the L1 serving as the transmitting coil is the largest, so that the voltage coupled to the receiving coil L2 is also the largest. When the working frequency is different from the resonant frequency of the series resonant circuit formed by the inductor L1 and the capacitor C1, because of the resonance 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 a working frequency signal (i.e., a high-frequency wireless carrier signal), and the impedance increases with the increase of the working frequency, so that the current of the L1 serving as a transmitting coil decreases, the alternating magnetic field generated by the L1 also decreases, and the voltage coupled to the receiving coil L2 also decreases; this impedance decreases with decreasing operating frequency, which results in increasing current of L1 as the transmitting coil, so that the alternating magnetic field generated by L1 increases, and then the voltage coupled to the receiving coil L2 increases, thereby realizing stable voltage and constant current of output, and because no DC-DC power device is used at the receiver end, the conversion efficiency is improved, and the heat generation is reduced.
The embodiment of the invention provides a transmitter, a receiver and a wireless charging system. The method comprises the steps that a high-frequency wireless receiving device of a transmitter receives a wireless signal, an oscillator is connected with a frequency conversion control circuit to generate a high-frequency wireless carrier signal, and the frequency conversion control circuit is also connected with the high-frequency wireless receiving device, so that the frequency of the high-frequency wireless carrier signal is increased when the wireless signal is a high-level signal, and the frequency of the high-frequency wireless carrier signal is reduced when the wireless signal is a low-level signal; the high-frequency wireless transmitting device of the receiver is used for transmitting wireless signals, the sampling module collects sampling voltage values and reference voltage, when the frequency of high-frequency wireless carrier signals of a frequency conversion control circuit of the transmitter is reduced, the sampling voltage values are reduced, when the frequency of the high-frequency wireless carrier signals 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, the conversion efficiency is improved, and the heat productivity is reduced.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, 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 present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (11)
1. A transmitter, wherein the transmitter is wirelessly coupled 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 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 used for providing power for 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 a high-frequency electromagnetic wave to be radiated;
the second driving circuit is respectively connected with the duty ratio adjusting circuit and the power supply module and is used for increasing 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 is 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; alternatively, the first and second electrodes may be,
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. A transmitter is characterized in that the transmitter is wirelessly connected with a receiver and 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 wireless signals;
the oscillator is connected with the frequency conversion 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, wherein the receiver is wirelessly connected to a transmitter for powering a load to 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 a 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 number of the first and second groups,
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 division 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, the current sampling circuit respectively with the load with the analog-to-digital conversion module is connected, the current sampling circuit includes current sampling resistance and coupling resistance, coupling resistance is used for with load voltage couples to on the current sampling resistance circuit, the current sampling circuit be used for the analog-to-digital conversion module provides the sampling voltage value.
8. The receiver of claim 7, further comprising:
a receiver resonant circuit for inducing the high frequency electromagnetic wave of the transmitter and converting it into a high frequency vibration voltage;
the rectifying circuit is connected with the receiver resonant circuit and is 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 filtering the direct-current voltage.
9. The receiver according to claim 6, wherein said high frequency wireless transmission 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; alternatively, the first and second electrodes may be,
the infrared emitter is connected with the analog-to-digital conversion module, and the infrared emitting LED is connected with the infrared emitter.
10. A receiver, wherein the receiver is wirelessly connected to a transmitter for powering a load to which the transmitter is mounted, comprising:
a high-frequency wireless transmitting device for transmitting a wireless signal;
the sampling module is used for acquiring a sampling voltage value and a reference voltage, when the frequency of a high-frequency wireless carrier signal of a 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 number of the first and second groups,
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 according to any one of claims 1-4 and a receiver according to any one of claims 6-9; alternatively, the first and second electrodes may be,
a transmitter as claimed in claim 5 and a receiver as claimed in claim 10.
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| CN201810620603.XA CN110611511B (en) | 2018-06-15 | 2018-06-15 | Transmitter, receiver and wireless charging system |
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