CN216086268U - WPT charging circuit and portable charging device based on magnetic coupling - Google Patents
WPT charging circuit and portable charging device based on magnetic coupling Download PDFInfo
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- CN216086268U CN216086268U CN202121311688.7U CN202121311688U CN216086268U CN 216086268 U CN216086268 U CN 216086268U CN 202121311688 U CN202121311688 U CN 202121311688U CN 216086268 U CN216086268 U CN 216086268U
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- 230000000087 stabilizing effect Effects 0.000 claims abstract description 15
- 230000005540 biological transmission Effects 0.000 abstract description 9
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- 239000003990 capacitor Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
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- 238000005265 energy consumption Methods 0.000 description 2
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- 230000003068 static effect Effects 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 241000190070 Sarracenia purpurea Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
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Abstract
The utility model discloses a WPT charging circuit and a portable charging device based on magnetic coupling; the WPT charging circuit based on magnetic coupling comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit comprises a power supply input end, a driving circuit connected with the power supply input end, an amplifying circuit connected with the driving circuit, and an LC transmitting circuit connected with the amplifying circuit; the receiving end circuit comprises an LC receiving circuit, a rectifying circuit connected with the LC receiving circuit, a voltage stabilizing circuit connected with the rectifying circuit and a power supply output end connected with the voltage stabilizing circuit; the receiving coil and the transmitting coil are both distributed in a disc shape, the receiving coil and the transmitting coil are in a parallel state, and the distance is 2mm to 50 mm. The utility model utilizes two LC resonance circuits, when the two resonance frequencies are the same, the receiving circuit and the transmitting circuit generate strong magnetic coupling through the alternating magnetic field of the space, and the electric quantity transmission is carried out through the resonance effect, thereby improving the efficiency and the transmission distance of the wireless transmission.
Description
Technical Field
The utility model relates to a charging circuit and a charging product, in particular to a WPT charging circuit and a portable charging device based on magnetic coupling.
Background
With the rapid development of science and technology, mobile phones have become an unavailable part in the work and life of people, and the problem of electric quantity is a pain point of people all the time, so that the mobile charger also starts to be operated, and the wireless mobile charger which gets rid of the constraint of data lines has become a choice of more and more people.
The wireless charging is to realize energy transmission between a power supply and electric equipment in a non-contact wireless mode, and the existing wireless charging technologies comprise an electromagnetic induction type, a magnetic resonance type, a radio wave type, an ultrasonic wave type, an infrared laser type and the like. Most of existing wireless power banks are based on electromagnetic induction type technology, and the technology is mature, but has the characteristics of metal induction contact heating and low transmission efficiency.
And current wireless charging product, structural design at the receiving terminal is not good, and the receiving terminal is inconvenient with the combination of the electronic product that is charged, uses.
SUMMERY OF THE UTILITY MODEL
The present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a WPT charging circuit and a portable charging device based on magnetic coupling.
The purpose of the utility model is realized by the following technical scheme:
the utility model relates to a WPT charging circuit based on magnetic coupling, which comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit comprises a power supply input end, a driving circuit connected with the power supply input end, an amplifying circuit connected with the driving circuit, and an LC transmitting circuit connected with the amplifying circuit; the LC transmitting circuit comprises a transmitting coil; the receiving end circuit comprises an LC receiving circuit, a rectifying circuit connected with the LC receiving circuit, a voltage stabilizing circuit connected with the rectifying circuit and a power output end connected with the voltage stabilizing circuit; the LC receiving circuit comprises a receiving coil; the receiving coil and the transmitting coil are both distributed in a disc shape, the receiving coil and the transmitting coil are in a parallel state, and the distance is 2mm to 50 mm.
Furthermore, the driving circuit adopts a pulse generator; the amplifying circuit adopts an MOS tube.
Further, the pulse generator is of an NE555 type, and the MOS tube is of an IRF540N channel type.
Further, the rectifier circuit is a full-bridge rectifier circuit formed by SB240 Schottky rectifier diodes; the voltage stabilizing circuit adopts a 7805 type three-terminal regulator.
The portable charging device comprises a transmitting end shell, a receiving end shell and the WPT charging circuit, wherein the transmitting end shell is connected with the receiving end shell; the transmitting end circuit is arranged in the transmitting end shell, and the receiving end circuit is arranged in the receiving end shell; the transmitting end shell is internally provided with a transmitting circuit board used for fixing the driving circuit and the amplifying circuit, and a rechargeable battery connected with the transmitting circuit board.
Further, the receiving end shell is provided with a cavity for accommodating the mobile electronic equipment; one end of the inner wall of the cavity is provided with the power supply output end; the receiving coil is clamped at the bottom of the cavity.
Furthermore, one end of the receiving end shell is connected with a movable block in a sliding manner, and a receiving circuit board used for fixing the rectifying circuit is arranged in the movable block; the movable block is also provided with a connecting sheet which is connected with the bottom of the cavity in a sliding way; the outer end of the connecting piece is connected with a return spring; the reset spring forms the conductive connection between the receiving coil and the receiving circuit board; the bottom of the cavity is provided with a chute for inserting the connecting sheet and a gap for loading the return spring.
Furthermore, a charging plug is arranged on one side of the movable block close to the cavity, and the charging plug forms the power output end; the cavity is close to the lateral wall of movable block is equipped with and is used for passing through charging plug's through-hole.
Further, the mobile electronic device is a mobile phone or a tablet computer.
Furthermore, the receiving end shell comprises an upper shell and a bottom plate arranged at the bottom of the upper shell, and the bottom plate is provided with a receiving groove for the receiving coil.
Compared with the prior art, the utility model has the beneficial effects that: the WPT charging circuit based on magnetic coupling adopts the LC transmitting circuit, utilizes the working principle of the LC resonance circuit to generate an alternating magnetic field with the self-resonance frequency of f1, further utilizes the receiving coil of the LC receiving circuit to generate direct current with the self-resonance frequency of f2, and provides a continuous and stable direct current power supply for a receiving end under the action of the rectifying circuit and the voltage stabilizing circuit. Description of the working principle: a source resonant frequency transmitting circuit is formed by an inductor L and a capacitor C and emits a non-radiative alternating magnetic field to the surrounding space, and the self-resonant frequency of the LC circuit is f 1; the receiving end is a receiver resonance circuit formed by the same inductor L and the same capacitor C, the self-resonance frequency is f2, when the two resonance frequencies are the same, the receiving circuit and the transmitting circuit generate strong magnetic coupling through an alternating magnetic field in space, and electric quantity transmission is carried out through the resonance effect, so that the wireless transmission efficiency and the transmission distance are improved.
Furthermore, an NE555 type chip is adopted as a pulse generator, an IRF540N channel type MOS tube is adopted, and the characteristics of low cost and high reliability are achieved.
The portable charging device is provided with the rechargeable battery in the transmitting end shell, so that fixed wireless charging and movable wireless charging can be realized.
Furthermore, a movable block in sliding connection is adopted, and a charging plug is arranged on the movable block, so that the mobile electronic equipment can be conveniently mounted in the cavity or dismounted from the cavity. The reset spring is adopted, so that the reset spring not only can be used for resetting the movable block, but also can be used for a wire of a receiving end circuit, and the two functions are achieved at one time. The receiving end shell further adopts a split structure, so that the production and the assembly of products are easy.
The utility model can be widely used for wireless charger products, can be used in the fields of low energy consumption, high output power and high compatibility, such as digital equipment of mobile phones, digital cameras, sound equipment and the like, and can also be used for common small household appliances, such as mini sound equipment and the like.
Drawings
Fig. 1 is a block diagram of a WPT charging circuit according to a first embodiment of the present invention;
fig. 2 is a first circuit schematic diagram of a transmitting-end circuit of a second embodiment of a magnetic coupling-based WPT charging circuit according to the present invention;
fig. 3 is a second schematic circuit diagram of a transmitting-end circuit of a second embodiment of a magnetic coupling-based WPT charging circuit according to the present invention;
fig. 4 is a schematic circuit diagram of a receiving-end circuit of a WPT charging circuit according to a second embodiment of the present invention;
fig. 5 is a schematic structural diagram and a partial enlarged view of a portable charging device according to an embodiment of the present invention.
Reference numerals
10 transmitting end circuit 11 power supply input end
12 driver circuit 13 amplifier circuit
14 LC transmitting circuit 15 transmitting coil
20 receiving end circuit
21 LC receiving circuit 22 rectifying circuit
23 voltage stabilizing circuit 24 power supply output terminal
25 receiving coil 70 movable block
71 coupling piece 72 return spring
77 charging plug 79 receiving circuit board
80 transmitting end shell 81 transmitting circuit board
82 rechargeable battery 90 receiving end housing
94 gap of through hole 97
98 chute 99 cavity
Detailed Description
The technical solutions of the present invention will be described clearly and completely by the following embodiments, which are only a part of the embodiments of the present invention, but not all of them. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the embodiments of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the utility model. As used in the description of embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
As shown in fig. 1, the WPT charging circuit based on magnetic coupling of the present invention includes a transmitting end circuit 10 and a receiving end circuit 20; the transmitting-end circuit 10 includes a power input terminal 11, a driving circuit 12 connected to the power input terminal 11, an amplifying circuit 13 connected to the driving circuit 12, and an LC transmitting circuit 14 connected to the amplifying circuit 13; the LC transmitting circuit 14 includes a transmitting coil (not shown in the figure); the receiving end circuit 20 comprises an LC receiving circuit 21, a rectifying circuit 22 connected with the LC receiving circuit 21, a voltage stabilizing circuit 23 connected with the rectifying circuit 22, and a power supply output end 24 connected with the voltage stabilizing circuit 23; the LC receiving circuit 21 includes a receiving coil (not shown in the figure); the receiving coil and the transmitting coil are both distributed in a disc shape, the receiving coil and the transmitting coil are in a parallel state, and the distance is 2mm to 50 mm.
More specifically, the drive circuit 12 employs a pulse generator; the amplifying circuit 13 uses a MOS transistor. The pulse generator may be of NE555 type and the MOS transistor may be of IRF540N channel type. The rectifying circuit 22 is a full-bridge rectifying circuit composed of SB240 schottky rectifying diodes; the voltage stabilizing circuit 23 adopts a 7805 type three-terminal regulator.
Fig. 2-4 are specific schematic circuit diagrams of the WPT charging circuit based on magnetic coupling according to the present invention, and the embodiment is used for experimental debugging. Four switch interfaces P2-P5 are adopted to connect capacitors with different capacitance sizes, so that the adjustment during experiments is convenient, and the charging device can also be used for charging products with special purposes. The specific circuit principle is illustrated as follows:
the driving circuit shown in fig. 2 adopts a small-signal pulse signal generator, takes an NE555 chip as a core, and can generate a control signal of an IRF540N power amplifier (i.e., an amplifying circuit) by matching with a simple peripheral circuit. The No. 8 pin of the NE555 is connected with a 5V direct-current voltage source through a 100uF capacitor C5, so that the influence of power supply ripples on the work of the chip is reduced; the No. 1 pin is grounded; and the No. 7 pin is connected with a 5V direct-current voltage source through a first 10K potentiometer, so that the duty ratio of the output pulse signal is dynamically adjustable. The frequency of the output pulse signal is dynamically adjustable through the second 10K potentiometer, the No. 2 pin and the No. 6 pin, the common end of the No. 2 pin and the No. 7 pin is connected to the ground through switch terminals P2, P3, P4 and P5 and capacitors C1, C2, C3 and C4 (the circuit is mainly used for experimental debugging and can be used for charging products with special purposes, and switches connected with switch interfaces P2, P3, P4 and P5 are selected to be conducted), so that the influence of various frequency noises of the circuit on dynamic conditions is favorably reduced; pin 3 is connected in series with a light emitting diode LED1 and a 1KS resistor R1 to a 5V dc voltage source. And the No. 5 pin is a pulse signal output end of the NE555 and is connected with a 0.1uF to the ground end in parallel, so that noise influence is filtered.
The basic principle of the amplifier circuit shown in fig. 3 is that a 5V small-signal pulse signal is input to the gate of the MOS transistor, and the gate resistor R5 serves as a leakage resistor to discharge a small amount of static electricity between the gate and the source, thereby preventing the MOS transistor from malfunctioning, and even breaking down the MOS transistor (because only a small amount of static electricity can generate a high voltage on the equivalent capacitance between the G-S electrodes of the MOS transistor), so as to protect the MOS transistor. After a small signal is input into the grid electrode, the small signal is amplified and then is obtained as an amplified signal at the drain electrode, the coil is used as a drain electrode resistor, after the MOS tube is conducted, the current of 1-2A flows, meanwhile, the capacitor C7 and the coil form an LC oscillating circuit, and when the resonant frequency is the same as the small signal input frequency, high-power electromagnetic resonance output is realized.
The receiving end circuit shown in fig. 4 is composed of an LC receiving circuit (also called LC oscillating circuit) and a rectifying circuit (also called rectifying and filtering circuit), wherein the rectifying part uses two parallel full-bridge rectifiers composed of schottky rectifying diodes SB240, and the filtering circuit is composed of two capacitors of 0.1uF and 100uF in parallel. When the receiving coil and the transmitting coil resonate, an LC oscillating circuit at the receiving end obtains an alternating current signal, the signal is rectified by a parallel full bridge, and a direct current signal is obtained at the load end after filtering.
As shown in fig. 5, the portable charging device of the present invention comprises a transmitting end housing 80, and a receiving end housing 90, and further comprises the aforementioned WPT charging circuit; the transmitting side circuit 10 is disposed in the transmitting side housing 80, and the receiving side circuit 20 is disposed in the receiving side housing 90; the transmitting end housing 80 is also provided with a transmitting circuit board 81 for fixing the driving circuit 12 and the amplifying circuit 13, and a rechargeable battery 82 connected to the transmitting circuit board 81. The receiving end housing 90 is provided with a cavity 99 for accommodating the mobile electronic device 60; one end of the inner wall of the cavity 99 is provided with a power supply output end 24; the bottom of the cavity 99 sandwiches a receiving coil 25. The transmitting end housing 80 is provided with a transmitting coil 15 inside near the upper surface.
More specifically, one end of the receiving end housing 90 is slidably connected with a movable block 70, and a receiving circuit board 79 for fixing the rectifying circuit 22 and the voltage stabilizing circuit 23 is arranged in the movable block 70; the movable block 70 is also provided with a connecting sheet 71 which is connected with the bottom of the cavity 99 in a sliding way; the outer end of the connecting piece 71 is connected with a return spring 72; the return spring 72 constitutes an electrically conductive connection between the receiving coil 25 and the receiving circuit board 79; the bottom of the cavity 99 is provided with a sliding slot 98 for inserting the coupling piece 71 and a notch 97 for installing or removing the return spring 72.
More specifically, a charging plug 77 is disposed on one side of the movable block 70 close to the cavity 99, and the charging plug 77 constitutes the power output terminal 24; the side wall of the cavity 99 near the movable block 70 is provided with a through hole 94 for passing through the charging plug 77.
More specifically, a split structure is adopted, the receiving end shell comprises an upper shell and a bottom plate arranged at the bottom of the upper shell, and the bottom plate is provided with a receiving groove of the receiving coil.
The mobile electronic device 60 may be a mobile phone or a tablet computer.
In other embodiments, the receiving end housing may also be a one-piece structure.
In other embodiments, the receiving end shell can also be a lunch box, a rice bowl, a water cup and other products needing to be heated.
In summary, the WPT charging circuit based on magnetic coupling of the present invention employs the LC transmitting circuit, and utilizes the operating principle of the LC resonant circuit to generate the alternating magnetic field with the self-resonant frequency of f1, and further utilizes the receiving coil of the LC receiving circuit to generate the direct current with the self-resonant frequency of f2, and provides a continuous and stable direct current power supply for the receiving end through the action of the rectifying circuit and the voltage stabilizing circuit. Description of the working principle: a source resonant frequency transmitting circuit is formed by an inductor L and a capacitor C and emits a non-radiative alternating magnetic field to the surrounding space, and the self-resonant frequency of the LC circuit is f 1; the receiving end is a receiver resonance circuit formed by the same inductor L and the same capacitor C, the self-resonance frequency is f2, when the two resonance frequencies are the same, the receiving circuit and the transmitting circuit generate strong magnetic coupling through an alternating magnetic field in space, and electric quantity transmission can be carried out through the resonance effect.
Furthermore, an NE555 type chip is adopted as a pulse generator, an IRF540N channel type MOS tube is adopted, and the characteristics of low cost and high reliability are achieved.
The portable charging device is provided with the rechargeable battery in the transmitting end shell, so that fixed wireless charging and movable wireless charging can be realized.
Furthermore, a movable block in sliding connection is adopted, and a charging plug is arranged on the movable block, so that the mobile electronic equipment can be conveniently mounted in the cavity or dismounted from the cavity. The reset spring is adopted, so that the reset spring not only can be used for resetting the movable block, but also can be used for a wire of a receiving end circuit, and the two functions are achieved at one time. The receiving end shell further adopts a split structure, so that the production and the assembly of products are easy.
The utility model can be widely used for wireless charger products, can be used in the fields of low energy consumption, high output power and high compatibility, such as digital equipment of mobile phones, digital cameras, sound equipment and the like, and can also be used for common small household appliances, such as mini sound equipment and the like.
The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the utility model is subject to the claims.
Claims (10)
1. The WPT charging circuit based on magnetic coupling comprises a transmitting end circuit and a receiving end circuit; the transmitting end circuit is characterized by comprising a power supply input end, a driving circuit connected with the power supply input end, an amplifying circuit connected with the driving circuit and an LC transmitting circuit connected with the amplifying circuit; the LC transmitting circuit comprises a transmitting coil; the receiving end circuit comprises an LC receiving circuit, a rectifying circuit connected with the LC receiving circuit, a voltage stabilizing circuit connected with the rectifying circuit and a power output end connected with the voltage stabilizing circuit; the LC receiving circuit comprises a receiving coil; the receiving coil and the transmitting coil are both distributed in a disc shape, the receiving coil and the transmitting coil are in a parallel state, and the distance is 2mm to 50 mm.
2. A magnetic coupling based WPT charging circuit as claimed in claim 1, wherein: the driving circuit adopts a pulse generator; the amplifying circuit adopts an MOS tube.
3. A WPT charging circuit based on magnetic coupling according to claim 2, characterised in that the pulse generator is of NE555 type, the MOS transistors being of IRF540N channel type.
4. The magnetic coupling-based WPT charging circuit as claimed in claim 1, 2 or 3, wherein the rectifying circuit is a full bridge rectifying circuit using SB240 Schottky rectifying diodes; the voltage stabilizing circuit adopts a 7805 type three-terminal regulator.
5. A portable charging device comprising a transmitting end housing, and a receiving end housing, further comprising a WPT charging circuit as claimed in any one of claims 1 to 4; the transmitting end circuit is arranged in the transmitting end shell, and the receiving end circuit is arranged in the receiving end shell; the transmitting end shell is internally provided with a transmitting circuit board used for fixing the driving circuit and the amplifying circuit, and a rechargeable battery connected with the transmitting circuit board.
6. The portable charging apparatus of claim 5, wherein the receiving end housing is provided with a cavity for receiving a mobile electronic device; one end of the inner wall of the cavity is provided with the power supply output end; the receiving coil is clamped at the bottom of the cavity.
7. The portable charging device of claim 6, wherein a movable block is slidably coupled to one end of the receiving end housing, and a receiving circuit board for fixing the rectifying circuit is disposed in the movable block; the movable block is also provided with a connecting sheet which is connected with the bottom of the cavity in a sliding way; the outer end of the connecting piece is connected with a return spring; the reset spring forms the conductive connection between the receiving coil and the receiving circuit board; the bottom of the cavity is provided with a chute for inserting the connecting sheet and a gap for loading the return spring.
8. The portable charging device of claim 7, wherein a charging plug is disposed on a side of the movable block close to the cavity, and the charging plug forms the power output end; the cavity is close to the lateral wall of movable block is equipped with and is used for passing through charging plug's through-hole.
9. The portable charging apparatus of claim 8, wherein the mobile electronic device is a mobile phone or a tablet computer.
10. The portable charging device of claim 9, wherein the receiving end housing comprises an upper housing, and a bottom plate disposed at the bottom of the upper housing, the bottom plate being provided with a receiving groove for the receiving coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311688.7U CN216086268U (en) | 2021-06-11 | 2021-06-11 | WPT charging circuit and portable charging device based on magnetic coupling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121311688.7U CN216086268U (en) | 2021-06-11 | 2021-06-11 | WPT charging circuit and portable charging device based on magnetic coupling |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216086268U true CN216086268U (en) | 2022-03-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121311688.7U Expired - Fee Related CN216086268U (en) | 2021-06-11 | 2021-06-11 | WPT charging circuit and portable charging device based on magnetic coupling |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216086268U (en) |
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2021
- 2021-06-11 CN CN202121311688.7U patent/CN216086268U/en not_active Expired - Fee Related
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Granted publication date: 20220318 |
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