CN113199948A - Wireless charging detection device - Google Patents
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- CN113199948A CN113199948A CN202110580478.6A CN202110580478A CN113199948A CN 113199948 A CN113199948 A CN 113199948A CN 202110580478 A CN202110580478 A CN 202110580478A CN 113199948 A CN113199948 A CN 113199948A
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- 238000001514 detection method Methods 0.000 title claims abstract description 145
- 239000002184 metal Substances 0.000 claims abstract description 46
- 229910052751 metal Inorganic materials 0.000 claims abstract description 46
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 8
- 239000010949 copper Substances 0.000 claims abstract description 8
- 238000005192 partition Methods 0.000 claims abstract description 4
- 239000003990 capacitor Substances 0.000 claims description 10
- 239000002023 wood Substances 0.000 claims description 2
- 238000013459 approach Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 8
- 230000008878 coupling Effects 0.000 description 6
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- 238000005859 coupling reaction Methods 0.000 description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
- B60L53/124—Detection or removal of foreign bodies
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
- B60L53/10—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by the energy transfer between the charging station and the vehicle
- B60L53/12—Inductive energy transfer
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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
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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
- H02J50/60—Circuit arrangements or systems for wireless supply or distribution of electric power responsive to the presence of foreign objects, e.g. detection of living beings
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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
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/14—Plug-in electric vehicles
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a wireless charging detection device, comprising: the supporting plate is used for limiting a square working area; the interior of the supporting plate is divided into a plurality of hollow square grooves arranged in an array mode through partition plates; a detection working group is arranged in any hollowed square groove; the detection workgroup comprises: magnetizers respectively arranged at four vertex angles of the hollowed square groove and a detection circuit board arranged in parallel across the hollowed square groove; and the magnetizer is wound with a copper coil, and the copper coil is connected with the detection circuit board. The invention can simultaneously detect whether metal objects and magnetic objects exist in the supporting plate area through the quality factor detection circuit board.
Description
Technical Field
The invention relates to the technical field of electric automobile charging, in particular to a wireless charging detection device.
Background
In order to deal with the increasingly severe problems of climate change and energy exhaustion, countries in the world strongly advocate the development of new energy technology. Because the electric energy has the characteristics of simple acquisition mode, environmental friendliness in the use process and the like, the electric automobile becomes a key object of attention for developing new energy technology. The charging modes of the electric automobile can be mainly divided into two modes, wherein one mode is wired charging mainly powered by a battery; the other is wireless charging. The wireless charging technology adopts a non-contact mode, the constraint of physical connection in the traditional charging mode is eliminated, and the stability and the flexibility of electric energy transmission are greatly improved. The current wireless power transmission technology can be mainly divided into an induction type and a resonance type. The magnetic coupling resonant wireless power transmission technology has advantages in both energy transmission distance and transmission efficiency, and is widely researched as a technical scheme for wireless charging of electric vehicles.
The principle of the magnetic coupling resonance type wireless power transmission technology is that resonance parameters are designed and changed to enable a transmitting coil and a receiving coil to achieve a self-resonance state, so that energy is transmitted from the transmitting coil to the receiving coil. With the continuous and deep research of the related technology, the magnetic coupling resonant wireless power transmission technology has become more and more mature, but some defects still exist. Firstly, when the magnetic coupling type wireless power transmission is adopted, the coupling coefficient between the transmitting coil and the receiving coil is an important factor influencing the charging efficiency, and in order to obtain higher charging efficiency, the accurate alignment of the transmitting coil and the receiving coil must be ensured when the electric automobile is parked. Secondly, the influence of the metal foreign matters on the magnetic coupling type wireless charging system of the electric automobile is also a concern. When there is the metallic foreign matter in the region that charges, can cause wireless charging system's operating temperature to rise, have very big potential safety hazard, can harm charging equipment when serious.
Disclosure of Invention
According to the technical problems of the coil accurate alignment and the metal foreign matter interference system, a wireless charging detection device is provided. The invention can accurately extract the position coordinates of the metal object and the magnetic object in the detection area, realize the high-precision detection of the metal object and the magnetic object and reduce the manufacturing cost.
The technical means adopted by the invention are as follows:
a wireless charging detection device, comprising: the supporting plate is used for limiting a square working area; the interior of the supporting plate is divided into a plurality of hollow square grooves arranged in an array mode through partition plates; a detection working group is arranged in any hollowed square groove;
the detection workgroup comprises: the detection circuit board comprises a detection circuit board and a magnetizer, wherein a copper coil is wound on the magnetizer and is connected with the detection circuit board through a copper wire;
the detection circuit board comprises a current regulator, a plurality of capacitors connected in parallel, an oscillator module, a demodulation module and a comparison module, wherein the capacitors connected in parallel and the magnetizer form an LC resonance circuit;
the current regulator is connected with an external power supply module on one hand and supplies power to the oscillator module, the demodulation module and the comparison module on the other hand;
the oscillator module is used for controlling the resonant circuit and adjusting the source driving frequency to the resonant frequency;
the demodulation module is used for receiving the voltage waveform signal output by the oscillator module and sending the voltage waveform signal to the comparison module;
the comparison module is used for comparing the received voltage signal with a preset detection reference so as to judge the type of the object in a certain range of the magnetizer, the detection threshold comprises a metal detection reference and a magnet detection reference, and the magnet detection reference is lower than the metal detection reference.
Further, the device also comprises an indicating module, wherein the indicating module is used for outputting an indicating signal according to the comparison result output by the comparing module;
when the voltage signal is higher than the metal detection reference, the indicating module outputs an alarm signal;
when the voltage signal is lower than the magnet detection reference, the indicating module outputs a charging signal, and the wireless charging device starts to charge.
Furthermore, the supporting plate is made of wood, and a plurality of wiring through holes are formed in the supporting plate.
Furthermore, the magnetizer is cylindrical, and the upper end surface of the magnetizer is flush with the upper surface of the supporting plate.
Furthermore, the detection working group comprises two detection circuit boards and four magnetizers, the magnetizers are respectively arranged at four vertex angles of the hollowed square groove, and the detection circuit boards are arranged in parallel across the hollowed square groove; and the arbitrary detection circuit board is connected with the two magnetizers.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, by designing the detection structure, under the condition that no metal or magnet exists, the output voltage of the demodulation module is just between the designed metal detection internal reference and the magnet detection internal reference, and when the metal approaches, the output voltage of the demodulation module is increased to be higher than the metal detection reference; when the magnet approaches, the output voltage of the demodulation module is reduced to be lower than the reference of the detection of the magnet, so that the detection device has the detection capability of both metal and the magnet.
2. The invention can accurately extract the position coordinates of the metal object and the magnetic object in the detection area of the support plate.
3. The invention has higher detection precision on metal objects and magnetic objects and lower manufacturing cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a top view of a wireless charging detection device according to the present invention.
Fig. 2 is a side view of the wireless charging detection device of the present invention.
FIG. 3 is a diagram of a quality factor detection circuit board according to the present invention.
FIG. 4 is a schematic diagram of a resonant circuit of the present invention.
FIG. 5 is a schematic view of a detection circuit board according to the present invention.
In the figure: 1. detecting the circuit board; 2. a magnetizer; 3. hollowing out the square groove; 4. a support plate; 5. a copper coil; 6. a signal output port; 7. and connecting the through holes.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. 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 is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
As shown in fig. 1 to 5, the present invention provides a wireless charging detection device, including: a support plate 4 for defining a square working area; the interior of the supporting plate 4 is divided into a plurality of hollow square grooves 3 arranged in an array mode through partition plates; a detection working group is arranged in any hollowed square groove; the detection workgroup comprises: the detection circuit board 1 and the magnetizer 2, wherein the magnetizer 2 is wound with a copper coil 5 and is connected with the detection circuit board 1 through a copper wire.
The detection circuit board comprises a current regulator, a plurality of capacitors connected in parallel, an oscillator module, a demodulation module and a comparison module, and the capacitors connected in parallel and the magnetizer form an LC resonance circuit. The current regulator is connected with an external power supply module on one hand and supplies power to the oscillator module, the demodulation module and the comparison module on the other hand; the oscillator module is used for controlling the resonant circuit and adjusting the source driving frequency to the resonant frequency; the demodulation module is used for receiving the voltage waveform signal output by the oscillator module and sending the voltage waveform signal to the comparison module; the comparison module is used for comparing the received voltage signal with a preset detection reference so as to judge the type of the object in a certain range of the magnetizer, the detection threshold comprises a metal detection reference and a magnet detection reference, and the magnet detection reference is lower than the metal detection reference. Preferably, the apparatus further comprises an indication module, configured to output an indication signal according to the comparison result output by the comparison module: when the voltage signal is higher than the metal detection reference, the indicating module outputs an alarm signal; when the voltage signal is lower than the magnet detection reference, the indicating module outputs a charging signal, and the wireless charging device starts to charge.
Specifically, the detection circuit board has a pair of through holes 7 for connection at both left and right ends, and the copper wires are connected to the circuit on the detection circuit board through the through holes. The detection circuit board is provided with C1 and C2 capacitors, and the magnetizer and C1 and C2 form an LC resonance circuit. The detection circuit board comprises a detection system, and the oscillator module, the demodulation module and the comparison module jointly form a core detection link of the detection system.
The oscillator module has the main function of controlling the resonant circuit and adjusting the source drive frequency to be the same as the resonant frequency to cause resonance. In the resonance state, the output voltage of the resonance circuit can be expressed as:
in the formula
-the output voltage (V) of the parallel resonant circuit;
q-resonant circuit quality factor
As can be seen from the above equation, when the input voltage is constant, the output voltage of the resonant circuit and the quality factor Q are related and proportional. When the metal is close to the magnetizer, the quality factor of the resonant circuit is reduced, so that the amplitude of the output voltage of the circuit is reduced. The resonant frequency of the circuit is preferably 0-800 KHz.
The demodulation module is used for receiving the voltage waveform signal with the amplitude being larger and output by the oscillator module, processing the voltage waveform signal into a voltage signal with a smaller amplitude and a waveform, and outputting the voltage signal to the comparison module. The core of the demodulation module is a peak value demodulation circuit, a DEMOD capacitor charged by an internal current source is connected inside the demodulation module, and when the resonator generates negative bias, the capacitor discharges. Therefore, the demodulation end capacitor becomes a charged state again in each negative half cycle of the oscillating voltage, so that the demodulation module outputs a voltage signal with a waveform, and the voltage signal processed by the demodulation module is sent to the comparison module again.
In the present invention, the comparison module has a metal detection comparison section and a magnet detection comparison section. When the comparison module works, the voltage signal output by the demodulation module is compared with the internal voltage reference, and the state of the output port is determined through logic judgment.
The working process of the metal detection comparison part is as follows: the internal reference is a preset voltage, and when no metal exists, the internal reference voltage is higher than the output voltage of the demodulation module; when metal exists, the quality factor of the resonant circuit is reduced, the amplitude of the output voltage of the resonant circuit is reduced, and the reduction of the amplitude of the voltage causes the output voltage of the demodulation module to rise. When metal approaches, the output voltage of the demodulation module just rises to be higher than the internal voltage reference by designing the detection structure of the circuit, and the output state of the metal detection voltage comparator is inverted, namely, the metal is detected.
The working process of the magnet detection comparison part is as follows: the output voltage of the demodulation module is also input into the magnet detection comparator, and the internal reference of the magnet detection system is different from the reference of metal detection. When the magnet is close to the magnetizer wound with the coil, the quality factor of the resonant circuit is increased, so that the amplitude of the output voltage of the resonant circuit is increased, and the output voltage of the demodulation module is reduced due to the increase of the amplitude. Therefore, under the condition that no magnet exists, the internal reference of the magnet detection system is set to be lower than the output voltage of the demodulation module, when the magnet approaches to the magnetizer wound with the coil, the output voltage of the demodulation module just drops to be lower than the set magnet detection reference, the output state of the magnet detection comparator is reversed, and the detection of the magnet is realized.
According to the invention, by designing the detection structure, under the condition that no metal or magnet exists, the output voltage of the demodulation module is just between the designed metal detection internal reference and the magnet detection internal reference, and when the metal approaches, the output voltage of the demodulation module is increased to be higher than the metal detection reference; when the magnet approaches, the output voltage of the demodulation module is reduced to be lower than the reference of the detection of the magnet, so that the detection device has the detection capability of both metal and the magnet.
The invention is further illustrated by the following specific application example.
The present embodiment provides a wireless charging detection apparatus, which includes a supporting plate, a plurality of magnetizers and a plurality of quality factor detection circuit boards. The supporting plate is provided with a plurality of hollowed square grooves, the magnetizer is fixed at four vertex angles in the square grooves, the magnetizer is wound with a copper coil, and the coil is connected with the quality factor detection circuit board. The quality factor detection circuit board can simultaneously detect whether metal objects and magnetic objects exist in the supporting board area. The backup pad is wooden material, and inside is opened has a plurality of line through-holes of walking. The magnetizers are cylindrical and are independent from each other. The upper end surface of the magnetizer is flush with the upper surface of the supporting plate.
Preferably, four magnetizers are arranged in each hollowed-out square groove, and the magnetizers are fixed at four vertex angles of the square groove. 2 detection circuit boards are arranged in each hollowed-out square groove, and the end surfaces of the two sides of each quality factor detection circuit board are vertically fixed on the two sides of each hollowed-out square groove. Two quality factor detection circuit boards in the same hollow square groove are placed in parallel.
Two ends of each detection circuit board are respectively connected with a magnetizer. Each detection circuit board comprises two identical detection circuits for improving detection precision. The detection circuit and the magnetizer form a metal and magnet approach detection sensor. The main body of the metal and magnet close to the detection sensor is a magnetizer loop, and the magnetizer is used as a probe of the sensor. The magnetizer loop is an LC parallel resonance circuit. When the metal object is close, the quality factor of the magnetizer loop is obviously reduced. When the magnetic objects are close, the quality factor of the magnetizer loop is obviously increased. The detection circuit can simultaneously judge whether metal objects and magnetic identification devices exist in the monitoring range of the metal and magnet approach detection sensor by detecting the variable quantity of the quality factor of the magnetizer loop.
In this embodiment, each detection circuit has two signal output ports, namely a metal signal output port and a magnet detection signal output port. Each signal output port is used for receiving the signal transmitted by the last detection circuit board on one hand and transmitting the signal to the next detection circuit board on the other hand.
Specifically, in this embodiment, the output end of the metal detection circuit is connected to two signal output ports, one signal output port is used for transmitting X-axis signals, and the other signal output port is used for transmitting Y-axis signals. The output end of the magnet detection circuit is connected with two signal output ports, one signal output port is used for transmitting X-axis signals, and the other signal output port is used for transmitting Y-axis signals.
Preferably, the detection circuit board in this embodiment has 8 signal output ports, and the 8 signal output ports are arranged in parallel on the top end of the quality factor detection circuit board. All the hollow square grooves are arranged into N rows and N lines, and the quality factor detection circuit boards fixed in the hollow square grooves are also arranged into rows. And metal detection signal output ports, which are used for transmitting Y-axis signals, of the quality factor detection circuit boards in the same row are sequentially connected, so that the metal detection circuits in the same row are connected in parallel. Magnet detection signal output ports of the quality factor detection circuit boards positioned in the same column, which are used for transmitting Y-axis signals, are sequentially connected, so that the magnet detection circuits positioned in the same column are connected in parallel. The magnet detection signal output ports of the quality factor detection circuit boards positioned on the same row and used for transmitting X-axis signals are sequentially connected, so that the metal detection circuits positioned on the same row are connected in parallel. Magnet detection signal output ports of the quality factor detection circuit boards positioned on the same row and used for transmitting X-axis signals are sequentially connected, so that the magnet detection circuits positioned on the same row are connected in parallel.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the 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 (5)
1. A wireless charging detection device, comprising: the supporting plate is used for limiting a square working area; the interior of the supporting plate is divided into a plurality of hollow square grooves arranged in an array mode through partition plates; a detection working group is arranged in any hollowed square groove;
the detection workgroup comprises: the detection circuit board comprises a detection circuit board and a magnetizer, wherein a copper coil is wound on the magnetizer and is connected with the detection circuit board through a copper wire;
the detection circuit board comprises a current regulator, a plurality of capacitors connected in parallel, an oscillator module, a demodulation module and a comparison module, wherein the capacitors connected in parallel and the magnetizer form an LC resonance circuit;
the current regulator is connected with an external power supply module on one hand and supplies power to the oscillator module, the demodulation module and the comparison module on the other hand;
the oscillator module is used for controlling the resonant circuit and adjusting the source driving frequency to the resonant frequency;
the demodulation module is used for receiving the voltage waveform signal output by the oscillator module and sending the voltage waveform signal to the comparison module;
the comparison module is used for comparing the received voltage signal with a preset detection reference so as to judge the type of the object in a certain range of the magnetizer, the detection threshold comprises a metal detection reference and a magnet detection reference, and the magnet detection reference is lower than the metal detection reference.
2. The wireless charging detection device of claim 1, further comprising an indication module, wherein the indication module is configured to output an indication signal according to the comparison result output by the comparison module;
when the voltage signal is higher than the metal detection reference, the indicating module outputs an alarm signal;
when the voltage signal is lower than the magnet detection reference, the indicating module outputs a charging signal, and the wireless charging device starts to charge.
3. The wireless charging detection device of claim 1, wherein the supporting plate is made of wood, and a plurality of wire through holes are formed inside the supporting plate.
4. The wireless charging detection device of claim 1, wherein the magnetizer is cylindrical, and an upper end surface of the magnetizer is flush with an upper surface of the supporting plate.
5. The wireless charging detection device according to claim 1, wherein the detection workgroup comprises two detection circuit boards and four magnetizers, the magnetizers are respectively arranged at four top corners of the hollowed square groove, and the detection circuit boards are arranged in parallel across the hollowed square groove; and the arbitrary detection circuit board is connected with the two magnetizers.
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| CN202110580478.6A CN113199948A (en) | 2021-05-26 | 2021-05-26 | Wireless charging detection device |
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| CN202110580478.6A CN113199948A (en) | 2021-05-26 | 2021-05-26 | Wireless charging detection device |
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