CN113858983A - Wireless charging system - Google Patents

Wireless charging system Download PDF

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Publication number
CN113858983A
CN113858983A CN202111079108.0A CN202111079108A CN113858983A CN 113858983 A CN113858983 A CN 113858983A CN 202111079108 A CN202111079108 A CN 202111079108A CN 113858983 A CN113858983 A CN 113858983A
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China
Prior art keywords
detection device
transmitting
receiving
capacitor
resonant
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Pending
Application number
CN202111079108.0A
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Chinese (zh)
Inventor
王哲
陆钧
贺凡波
葛俊杰
马俊超
石晓峰
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Hefei Yougan Technology Co ltd
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Hefei Yougan Technology Co ltd
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Priority to CN202111079108.0A priority Critical patent/CN113858983A/en
Publication of CN113858983A publication Critical patent/CN113858983A/en
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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
    • 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
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • 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)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The invention discloses a wireless charging system, which comprises a transmitting end and a receiving end, wherein the transmitting end is provided with a transmitting resonance capacitor and a transmitting coil, the receiving end is provided with a receiving resonance capacitor and a receiving coil, and the wireless charging system also comprises detection equipment, and the detection equipment is arranged at the transmitting end and/or the receiving end; the detection device is provided with a detector and a capacitance access port; when the detection equipment is arranged at the transmitting end, the capacitor access port is connected with a transmitting resonant capacitor and a transmitting coil to form a resonant circuit; when the detection equipment is arranged at a receiving end, the capacitor access port is accessed to the receiving resonant capacitor and the receiving coil to form a resonant circuit; the detector detects a voltage value of the resonant tank. The capacitance value of the transmitting resonant capacitor or the capacitance value of the receiving end resonant capacitor can be changed, the working resonant frequency of the wireless charging system is unchanged, and therefore the resonant circuit is not in a resonant state, the voltage value of the resonant circuit detected by the detector is changed, and the influence of the temperature on the system is directly judged through the change of the voltage value.

Description

Wireless charging system
Technical Field
The invention relates to the field of wireless charging, in particular to a wireless charging system.
Background
With the continuous consumption of fossil energy and the continuous aggravation of environmental pollution, the new energy automobile industry is greatly supported by governments of various countries and is in a stage of high-speed development. The wireless charging of the electric automobile has the advantages of safety, convenience, automation and the like, and becomes a hotspot of the research and development of the charging technology.
In the wireless charging process, heat can be generated along with the transceiving of wireless energy of the transmitting end and the receiving end, so that the working efficiency of wireless charging is influenced, and potential safety hazards are caused. In the traditional scheme, a temperature sensor is adopted to detect the temperature, but the mode depends on the position of the sensor, the influence of temperature change on the system cannot be comprehensively detected, and certain hysteresis exists.
Disclosure of Invention
The invention provides a wireless charging system which can directly acquire the influence of temperature on the system and has a more efficient detection effect.
The wireless charging system comprises a transmitting end and a receiving end, wherein the transmitting end is provided with a transmitting resonance capacitor and a transmitting coil, the receiving end is provided with a receiving resonance capacitor and a receiving coil, and the wireless charging system also comprises detection equipment, and the detection equipment is arranged at the transmitting end and/or the receiving end; the detection device is provided with a detector and a capacitance access port; when the detection equipment is arranged at the transmitting end, the capacitor access port is connected into the transmitting resonant capacitor and the transmitting coil to form a resonant circuit; when the detection equipment is arranged at the receiving end, the capacitor access port is accessed into the receiving resonant capacitor and the receiving coil to form a resonant loop; the detector detects a voltage value of the resonant tank.
Preferably, the detection device is provided with a detector, a working inductor and a capacitance access port; when the detection equipment is arranged at the transmitting end, the capacitor access port is accessed to the transmitting resonant capacitor and arranged at the receiving end, and the capacitor access port is accessed to the receiving resonant capacitor and forms a resonant circuit; the detector detects a voltage value of the resonant tank.
Preferably, the detection device further includes a working resistor connected in series in the resonant tank, and the detector detects a voltage across the working resistor.
Preferably, the detection device further has a detection signal transmitting device.
Preferably, when disposed at the transmitting end, the natural resonant frequency of the detecting device is:
Figure BDA0003263298750000021
wherein f is1Is the natural resonant frequency, L2Is the inductance value, C, of the transmitting coil2Is the capacitance value of the transmission resonance capacitor; and at a standard temperature, the natural resonant frequency of the detection equipment is equal to the working resonant frequency of the wireless charging system;
when the resonance frequency of the detection device is set at the receiving end, the natural resonance frequency of the detection device is as follows:
Figure BDA0003263298750000022
wherein f is1Is the natural resonant frequency, L3An inductance value, C, of the receiving coil3Is the capacitance value of the receiving resonance capacitor; and at a standard temperature, the natural resonant frequency of the detection device is equal to the working resonant frequency of the wireless charging system.
Preferably, when disposed at the transmitting end, the natural resonant frequency of the detecting device is:
Figure BDA0003263298750000023
wherein f is1Is the natural resonant frequency, L1An inductance value, C, of the working inductor2Is the capacitance value of the transmission resonance capacitor; and at standard temperature, the natural resonance of the detection deviceThe vibration frequency is equal to the working resonance frequency of the wireless charging system;
when the resonance frequency of the detection device is set at the receiving end, the natural resonance frequency of the detection device is as follows:
Figure BDA0003263298750000031
wherein f is1Is the natural resonant frequency, L1An inductance value, C, of the working inductor3Is the capacitance value of the receiving resonance capacitor; and at a standard temperature, the natural resonant frequency of the detection device is equal to the working resonant frequency of the wireless charging system.
According to the wireless charging system, the detection equipment is connected with the transmitting resonant capacitor or the receiving end resonant capacitor to form a resonant circuit, when the temperature changes, the capacitance value of the transmitting resonant capacitor or the receiving end resonant capacitor changes, but based on the principle of the wireless charging system, the working resonant frequency of the wireless charging system is unchanged, so that the resonant circuit is not in a resonant state, the voltage value of the resonant circuit detected by the detector changes, and the influence of the temperature on the system is directly judged through the change of the voltage value.
Drawings
Fig. 1 is a schematic diagram of a wireless charging system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of another embodiment of a wireless charging system according to the invention.
Reference numerals:
a detection device 1; a transmitting end 2; receiving end 3
A working inductance 12; a working resistor 13; a detector 14; a transmitting coil 20; a power supply 21; a transmitting-side rectifier 22; an inverter 23; a transmitting-end compensation network 24; a receiving coil 30; a receiving-end resonant network 31; a receiving-end resonator 32; a transmitting end compensation capacitor 241; the receiving terminal compensates the capacitance 311.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
The invention discloses a wireless charging system, which comprises: detection device 1, transmitting end 2 and receiving end 3. Referring to fig. 1 and 2, the transmitting end 2 includes a power supply 21, a transmitting end rectifier 22, an inverter 23 (which may also be an inverter circuit), a transmitting end compensation network 24 (which may also be a compensation circuit), and a transmitting coil 20. The specific structure of the transmitting terminal compensation network 24 can be set according to actual requirements, but the compensation network has a transmitting terminal compensation capacitor 241, and any capacitor in any form of compensation network can be the transmitting terminal compensation capacitor 241. The receiving end includes a receiving coil 30, a receiving-end resonant network 31, a receiving-end resonator 32 (which may also be a resonant circuit), and a load 33. The specific structure of the receiving-end compensation network 31 can be set according to actual requirements, but the compensation network has a receiving-end compensation capacitor 311, and any capacitor in any form of compensation network can be the receiving-end compensation capacitor 311.
It should be noted that compensation capacitors are required to be used in the compensation network of either the receiving terminal 3 or the transmitting terminal 2, and these capacitors used in the compensation network are considered as the receiving terminal compensation capacitor 311 or the transmitting terminal compensation capacitor 241 according to their positions.
The detection device 1 needs to be operatively connected to the receiving-side compensation capacitor 311 and/or the transmitting-side compensation capacitor 241. In particular, the detection device 1 has a detector 14 and an access for accessing the aforementioned capacitance, which is intended to be connected to the two plates of the capacitance, so that the capacitance is connected into the detection device 1 and forms a resonant circuit.
Detection device 1 can be divided into two kinds of modes of having work inductance 12 and not having work inductance 12, according to different setting methods and positions, has several kinds of different connected modes, also can have the difference whether there is work inductance 12 simultaneously, and is specific:
1. is arranged at the transmitting end
1.1 the capacitance access is connected into the transmitting resonance capacitance 241 and the transmitting coil 20, and forms a resonance loop.
1.2 the capacitive access is connected to a transmission resonant capacitor 241, the detection device 1 then having an operating inductance 12, which form a resonant circuit.
2. Arranged at a receiving end
2.1 the capacitor access is connected to the receiving resonance capacitor 311 and the receiving coil 30, and forms a resonance loop.
2.2 the capacitive access is connected to a receiving resonant capacitor 311, and the detecting device 1 has an operating inductor 12 and forms a resonant circuit.
3. Arranged at both transmitting and receiving ends
3.1 the capacitor access port is connected with the transmitting resonance capacitor 241 and the transmitting coil 20 to form a resonance loop; the capacitor inlet is connected to the receiving resonant capacitor 311 and the receiving coil 30, and forms a resonant circuit.
3.2, a transmitting resonant capacitor 241 is connected to the capacitor access port, and the detection device 1 has a working inductor 12 and forms a resonant loop; the capacitance inlet is connected to a receiving resonant capacitor 311, and the detection device 1 has a working inductor 12 and forms a resonant circuit.
3.3 a group of capacitor access ports are connected into the transmitting resonant capacitor 241 and the transmitting coil 20 to form a resonant circuit; the other group of capacitor access ports is connected to a transmitting resonant capacitor 241, and the detection device 1 has a working inductor 12 and forms a resonant circuit.
3.4, a group of capacitor access ports are connected to the transmitting resonant capacitor 241, and the detection device 1 has a working inductor 12 and forms a resonant loop; and the other group of capacitor access ports are connected into the receiving resonant capacitor 311 and the receiving coil 30 and form a resonant loop.
In summary, the detecting device 1 can be arbitrarily arranged between the receiving end 3 and the transmitting end 2, and at any end, there can be two access modes — accessing the transmitting coil 20 (or accessing the receiving coil 30), and not accessing the transmitting coil 20 (or not accessing the receiving coil 30). When the transmitter coil 20 is not connected (or the receiver coil 30 is not connected), the working inductor 12 needs to be arranged in the detection device 1.
The resonant tank is an LCR resonant circuit, and the receiver coil 30 or the transmitter coil 20 may be used as an inductance in the resonant tank. The transmission resonance capacitance 241 or the reception resonance capacitance 311 serves as a capacitance in the resonance circuit.
For the capacitance value of the transmission resonance capacitor and the capacitance value of the reception resonance capacitor described above, the following relationship is satisfied:
C＝ε0εrs/d … … … … … … … … … … … … formula 1
Wherein C represents the capacitance value, ε0Is vacuum absolute dielectric constant (8.85 × 10)-12F/m)，εrIs the dielectric constant of the dielectric material between the capacitors, S is the area of the capacitor plates, and d is the spacing between the capacitor plates. Epsilon as mentioned above0And εrThe value of (2) is related to the temperature, and when the temperature of the capacitor changes, the corresponding change value of the capacitor also changes. This equation 1 is applied to the calculation of the capacitance value of the transmission resonance capacitance and the capacitance value of the reception resonance capacitance.
The detection device 1 works together with the wireless charging transmitting terminal 2, the power supply 21 provides electric energy, and an electric signal with fixed frequency is finally formed through the transmitting terminal rectifier 22, the inverter 23 and the transmitting terminal compensation network 24, namely the working resonant frequency f of wireless charging0For the detection device 1, the frequency of the electricity input thereto is also the operating frequency, and for the resonant circuit formed by it, the natural resonant frequency f1 is obtained, and for different connection forms, the following calculation is performed:
for case 1.1, the natural resonant frequency f1 is:
Figure BDA0003263298750000061
wherein L is2Is the inductance value, C, of the transmitting coil 202Is the capacitance value of the transmission resonance capacitance 241; and at a standard temperature, the natural resonant frequency of the detection device 1 is equal to the working resonant frequency of the wireless charging system;
for case 1.2, the natural resonant frequency f1 is:
Figure BDA0003263298750000062
wherein L is1An inductance value, C, of the working inductor2Is the capacitance value of the transmission resonance capacitor; and at a standard temperature, the natural resonant frequency of the detection device is equal to the working resonant frequency of the wireless charging system.
For case 2.1, the natural resonant frequency f1 is:
Figure BDA0003263298750000063
wherein L is3An inductance value, C, of the receiving coil3Is the capacitance value of the receiving resonance capacitor; and at a standard temperature, the natural resonant frequency of the detection device is equal to the working resonant frequency of the wireless charging system.
For case 2.2, the natural resonant frequency f1 is:
Figure BDA0003263298750000071
L1an inductance value, C, of the working inductor3Is the capacitance value of the receiving resonance capacitor; and at a standard temperature, the natural resonant frequency of the detection device is equal to the working resonant frequency of the wireless charging system.
For cases 3.1 to 3.4, knowledge is accessed to the detection device 1 at the receiving end 3 and the transmitting end 2 simultaneously, and the calculation mode can be obtained by combining the above equations 2.1 to 2.4.
Natural resonant frequency f at normal temperature1And the operating resonance frequency f0Equal and in a resonant state where the phases of the capacitor and inductor complement each other and the voltage at the detector 14 is divided into a maximum value. When the temperature changes, the capacitance value changes, resulting in the natural resonant frequency f1Change so that the resonant circuit does notIn the resonant state, the voltage drop is divided across the detector 14.
Through the detection of the voltage by the detector 14, the temperature state of the receiving resonant capacitor 311 or the transmitting resonant capacitor 241 can be known, and the temperature influence of the two capacitors can directly react on the voltage value, so that the response speed is faster and more accurate compared with the response speed obtained by using a temperature sensor.
The general detection device 1 also comprises a working resistor 13, which is connected directly in series in the resonant tank, and a detector 14 detects the voltage across said working resistor 13.
In some embodiments, the detection device 1 further has a signal emitting device, and when detecting the voltage change, a corresponding signal is emitted to indicate that a high temperature condition may exist at the emitting end 2 or the receiving end 3.
The construction, features and functions of the present invention are described in detail in the embodiments illustrated in the drawings, which are only preferred embodiments of the present invention, but the present invention is not limited by the drawings, and all equivalent embodiments modified or changed according to the idea of the present invention should fall within the protection scope of the present invention without departing from the spirit of the present invention covered by the description and the drawings.

Claims (6)

1. A wireless charging system comprising a transmitting terminal (2) and a receiving terminal (3), the transmitting terminal (2) having a transmitting resonant capacitor (241) and a transmitting coil (20), the receiving terminal (3) having a receiving resonant capacitor (311) and a receiving coil (30), characterized in that,
the device also comprises a detection device (1), wherein the detection device (1) is arranged at the transmitting end (2) and/or the receiving end (3);
the detection device has a detector (14) and also a capacitive access;
when the detection device (1) is arranged at the transmitting end (2), the capacitance access port is accessed into the transmitting resonance capacitance (241) and the transmitting coil (20) and forms a resonance loop;
when the detection device (1) is arranged at the receiving end (3), the capacitance access port is accessed into the receiving resonance capacitance (311) and the receiving coil (30) and forms a resonance loop;
the detector (14) detects a voltage value of the resonant tank.
2. The wireless charging system of claim 1,
the detection device comprises a detector (14) and a working inductor (12), and also comprises a capacitance access port;
when the detection device (1) is arranged at the transmitting end (2), the capacitor access port is connected into the transmitting resonant capacitor (241) and forms a resonant circuit;
when the detection device (1) is arranged at the receiving end (3), the capacitor access port is connected into the receiving resonant capacitor (311) and forms a resonant circuit;
the detector (14) detects a voltage value of the resonant tank.
3. The wireless charging system according to claim 1 or 2,
the detection device further comprises a working resistor (13) connected in series in the resonant tank, and the detector (14) detects the voltage across the working resistor (13).
4. The wireless charging system of claim 1,
the detection device (1) also has a detection signal emitting device.
5. The wireless charging system of claim 1,
when arranged at the transmitting end (2), the natural resonant frequency of the detection device (1) is:
Figure FDA0003263298740000021
wherein f is1Is the natural resonant frequency, L2Is the said transmission lineInductance value, C, of the ring (20)2Is the capacitance value of the transmission resonance capacitance (241); and at a standard temperature, the natural resonant frequency of the detection device (1) is equal to the working resonant frequency of the wireless charging system;
when arranged at the receiving end (3), the natural resonant frequency of the detection device (1) is:
Figure FDA0003263298740000022
wherein f is1Is the natural resonant frequency, L3Is the inductance value, C, of the receiving coil (30)3A capacitance value of the reception resonance capacitance (311); and at a standard temperature, the natural resonant frequency of the detection device (1) is equal to the operating resonant frequency of the wireless charging system.
6. The wireless charging system of claim 2,
when arranged at the transmitting end (2), the natural resonant frequency of the detection device (1) is:
Figure FDA0003263298740000023
wherein f is1Is the natural resonant frequency, L1Is the inductance value, C, of the working inductor (12)2Is the capacitance value of the transmission resonance capacitance (241); and at a standard temperature, the natural resonant frequency of the detection device (1) is equal to the working resonant frequency of the wireless charging system;
when arranged at the receiving end (3), the natural resonant frequency of the detection device (1) is:
Figure FDA0003263298740000024
wherein f is1Is the natural resonant frequency, L1For the workInductance value of inductor (12), C3A capacitance value of the reception resonance capacitance (311); and at a standard temperature, the natural resonant frequency of the detection device (1) is equal to the operating resonant frequency of the wireless charging system.
CN202111079108.0A 2021-09-15 2021-09-15 Wireless charging system Pending CN113858983A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114701374A (en) * 2022-06-07 2022-07-05 合肥有感科技有限责任公司 Wireless charging system control method

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CN112531917A (en) * 2020-11-23 2021-03-19 歌尔光学科技有限公司 Wireless charging receiving device and electronic equipment

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US20160276876A1 (en) * 2013-12-05 2016-09-22 Panasonic Intellectual Property Management Co., Ltd. Array coil system
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114701374A (en) * 2022-06-07 2022-07-05 合肥有感科技有限责任公司 Wireless charging system control method

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