阅读说明：本技术 一种用于电动车辆无线充电装置的导体异物检测装置 (Conductor foreign matter detection device for wireless charging device of electric vehicle ) 是由 陈国龙 王慷 宋致博 靳伍银 于 2019-12-06 设计创作，主要内容包括：本发明公开了一种用于电动车辆无线充电装置的导体异物检测装置,包括：激励线圈、检测线圈和壳体；激励线圈和检测线圈均固定在壳体上；当无线充电装置停机检测时,激励线圈通电产生激励磁场,检测线圈拾取激励磁场或激励磁场与导体异物产生的二次磁场的耦合磁场A；当无线充电装置在役检测时,激励线圈不工作,无线充电装置激发原磁场,检测线圈拾取原磁场或原磁场与导体异物产生的二次磁场的耦合磁场B；当检测线圈拾取耦合磁场A时,与其相连的输出设备显示电压信号相对检测线圈拾取原磁场时显示电压信号变化,表示有导体异物；当检测线圈拾取耦合磁场B时,输出设备显示电压信号相对检测线圈拾取激励磁场时显示电压信号变化,表示有导体异物。(The invention discloses a conductor foreign matter detection device for an electric vehicle wireless charging device, which comprises: an excitation coil, a detection coil and a case; the exciting coil and the detecting coil are fixed on the shell; when the wireless charging device is stopped and detected, the exciting coil is electrified to generate an exciting magnetic field, and the detecting coil picks up the exciting magnetic field or a coupling magnetic field A of a secondary magnetic field generated by the exciting magnetic field and a conductor foreign body; when the wireless charging device is detected in service, the exciting coil does not work, the wireless charging device excites an original magnetic field, and the detecting coil picks up a coupling magnetic field B of the original magnetic field or a secondary magnetic field generated by the original magnetic field and a conductor foreign body; when the detection coil picks up the coupling magnetic field A, the output equipment connected with the detection coil displays the change of voltage signals relative to the detection coil which picks up the original magnetic field and displays the change of the voltage signals, which indicates that a conductor foreign body exists; when the detection coil picks up the coupling magnetic field B, the output device displays that the voltage signal changes relative to the detection coil when the excitation magnetic field is picked up, and the voltage signal indicates that a conductor foreign body exists.)

1. A conductor foreign object detection device for an electric vehicle wireless charging device, characterized by comprising: an excitation coil, a detection coil and a case; the exciting coil and the detecting coil are fixed on the shell;

when the wireless charging device is stopped and detected, the exciting coil is electrified to generate an exciting magnetic field, and the detecting coil is used for picking up a coupling magnetic field A of the exciting magnetic field or a secondary magnetic field generated by the exciting magnetic field and a conductor foreign body;

when the wireless charging device is detected in service, the exciting coil does not work, the wireless charging device excites an original magnetic field, and the detecting coil is used for picking up a coupling magnetic field B of the original magnetic field or a secondary magnetic field generated by the original magnetic field and a conductor foreign body;

when the detection coil picks up the coupling magnetic field A, a voltage signal displayed by an output device connected with the detection coil changes relative to a voltage signal displayed when the detection coil picks up the original magnetic field, and is used for indicating that conductor foreign matter exists; when the detection coil picks up the coupling magnetic field B, the voltage signal displayed by the output device changes relative to the voltage signal displayed when the detection coil picks up the excitation magnetic field, indicating the presence of a conductive foreign object.

2. The conductor foreign object detection device for the wireless charging device of the electric vehicle as claimed in claim 1, further comprising a lifting mechanism, wherein a chute for communicating the inside and the outside of the housing is formed at one side of the housing; the exciting coil and the detecting coil are both positioned outside one side of the shell, which is provided with the sliding chute; the lifting mechanism is arranged in the shell, one end of the exciting coil penetrates through a sliding groove in the shell and is fixedly connected with the lifting mechanism arranged in the shell, and when the detecting coil is lifted off and/or vibrated, the height of the exciting coil relative to the detecting coil is adjusted through the lifting mechanism.

3. The conductor foreign object detection device for an electric vehicle wireless charging device according to claim 1 or 2, further comprising a balance coil disposed between the excitation coil and the detection coil, wherein when the detection coil is lifted off and/or vibrated, a height and/or an angle of the balance coil with respect to the detection coil is adjusted so that a magnetic field picked up by the detection coil is stabilized.

4. The conductor foreign object detection apparatus for an electric vehicle wireless charging apparatus according to claim 3, further comprising a rotary elevating mechanism provided in the inner cavity of the housing, wherein the balance coil is connected to the rotary elevating mechanism, and the rotary elevating mechanism drives the balance coil to ascend and descend and/or drives the balance coil to rotate so as to adjust a height and/or an angle of the balance coil relative to the detection coil.

5. The conductor foreign object detection apparatus for an electric vehicle wireless charging apparatus according to claim 4, further comprising a feedback control adjusting unit provided in the inner cavity of the housing, the excitation coil and the detection coil being electrically connected to the feedback control adjusting unit, respectively, the feedback control adjusting unit supplying power to the excitation coil, extracting relative distances of the excitation coil and the detection coil with respect to the surface of the measured object, respectively, calculating a height required to be adjusted of the excitation coil based on the relative distances, and controlling the excitation coil to ascend and descend according to the calculated height required to be adjusted; and calculating and processing according to the relative distance to obtain the height required to be adjusted of the balance coil, and controlling the lifting and/or rotation of the balance coil according to the calculated height or angle required to be adjusted.

6. The conductor foreign object detection apparatus for an electric vehicle wireless charging apparatus according to claim 5, wherein the feedback control adjustment unit comprises: the device comprises a distance signal extraction module, a distance signal receiving module, a calculation module, a control module and a power supply module; the power supply module is respectively connected with the control module and the exciting coil, and the control module controls the power supply module to supply power to the exciting coil;

the distance signal extraction module is used for respectively extracting the relative distance between the excitation coil and the detection coil relative to the surface of the detected piece and transmitting the extracted relative distance to the distance signal receiving module, the distance signal receiving module processes the relative distance and transmits the processed relative distance to the calculation module, and the calculation module analyzes and processes the relative position by using a built-in algorithm and calculates to obtain the change quantity of the coupling magnetic field A of the detection coil influenced by lift-off and/or vibration or the change quantity of the coupling magnetic field B influenced by lift-off and/or vibration;

when the wireless charging device stops detecting, the calculation module calculates the height of the exciting coil to be adjusted according to the variation of the coupling magnetic field A and transmits the height to the control module, and the control module controls the lifting mechanism to lift and/or controls the rotary lifting mechanism to lift and/or rotate so as to balance the variation of the lifting and/or vibration effect on the coupling magnetic field A;

when the wireless charging device is used for detection, the calculation module calculates the angle and/or height of the balance coil to be adjusted according to the change of the coupling magnetic field B and transmits the angle and/or height to the control module, and the control module controls the rotary lifting mechanism to drive the balance coil to lift and/or rotate so as to balance the change of the lifting and/or vibration effect on the original magnetic field or the coupling magnetic field B.

7. The conductor foreign object detection device for an electric vehicle wireless charging device according to claim 1 or 2, wherein the detection coil employs an 8-shaped differential pickup coil.

Technical Field

The invention relates to the technical field of vehicles, in particular to a conductor foreign matter detection device for a wireless charging device of an electric vehicle.

Background

Due to the adjustment of national energy structures and the rapid development of new energy industries, electric vehicles gradually occupy a large market. With the widespread use of electric vehicles, researchers have proposed various charging methods for the problem of charging electric vehicles. In contrast, wireless charging is undoubtedly a promising charging method. The wireless charging of the electric vehicle has the advantages of non-contact, charging time elasticity, charging convenience and the like, so that the electric vehicle can be charged in the states of traffic lights, parking lots and the like, and the time of a user is greatly saved. However, when conductor foreign matter falls into the wireless charging device of the electric vehicle, not only the charging efficiency of the wireless charging device is affected, but also eddy current can be generated under the excitation of the wireless charging device of the electric vehicle no matter whether the conductor foreign matter is ferromagnetic metal foreign matter, non-ferromagnetic metal foreign matter or non-metal, and the eddy current effect can rapidly raise the temperature of the conductor foreign matter, thereby causing certain potential safety hazard. Therefore, conductor foreign matter detection is required for the wireless charging device of the electric vehicle, so as to ensure high efficiency and safety during wireless charging of the electric vehicle.

Disclosure of Invention

In view of the above, the present invention provides a conductor foreign object detection apparatus for an electric vehicle wireless charging apparatus, which can detect a conductor foreign object that has fallen into the electric vehicle wireless charging apparatus in both a stopped state and a non-stopped state of the wireless charging apparatus.

The technical scheme of the invention is as follows: a conductor foreign object detection device for an electric vehicle wireless charging device, comprising: an excitation coil, a detection coil and a case; the exciting coil and the detecting coil are fixed on the shell;

when the wireless charging device is stopped and detected, the exciting coil is electrified to generate an exciting magnetic field, and the detecting coil is used for picking up a coupling magnetic field A of the exciting magnetic field or a secondary magnetic field generated by the exciting magnetic field and a conductor foreign body;

when the wireless charging device is detected in service, the exciting coil does not work, the wireless charging device excites an original magnetic field, and the detecting coil is used for picking up a coupling magnetic field B of the original magnetic field or a secondary magnetic field generated by the original magnetic field and a conductor foreign body;

when the detection coil picks up the coupling magnetic field A, a voltage signal displayed by an output device connected with the detection coil changes relative to a voltage signal displayed when the detection coil picks up the original magnetic field, and is used for indicating that conductor foreign matter exists; when the detection coil picks up the coupling magnetic field B, the voltage signal displayed by the output device changes relative to the voltage signal displayed when the detection coil picks up the excitation magnetic field, indicating the presence of a conductive foreign object.

Preferably, the lifting device also comprises a lifting mechanism, and one side of the shell is provided with a chute for communicating the inside and the outside of the shell; the exciting coil and the detecting coil are both positioned outside one side of the shell, which is provided with the sliding chute; the lifting mechanism is arranged in the shell, one end of the exciting coil penetrates through a sliding groove in the shell and is fixedly connected with the lifting mechanism arranged in the shell, and when the detecting coil is lifted off and/or vibrated, the height of the exciting coil relative to the detecting coil is adjusted through the lifting mechanism.

Preferably, the detection coil further comprises a balance coil, the balance coil is positioned between the excitation coil and the detection coil, and when the detection coil is lifted off and/or vibrated, the height and/or the angle of the balance coil relative to the detection coil are adjusted, so that the magnetic field picked up by the detection coil is stable and unchanged.

Preferably, the detection coil further comprises a rotary lifting mechanism, the rotary lifting mechanism is arranged in the cavity inside the shell, the balance coil is connected with the rotary lifting mechanism, and the rotary lifting mechanism drives the balance coil to lift and/or drive the balance coil to rotate so as to adjust the height and/or the angle of the balance coil relative to the detection coil.

Preferably, the device also comprises a feedback control adjusting unit, the feedback control adjusting unit is arranged in an internal cavity of the shell, the excitation coil and the detection coil are respectively and electrically connected with the feedback control adjusting unit, the feedback control adjusting unit supplies power to the excitation coil, respectively extracts the relative distance between the excitation coil and the detection coil relative to the surface of the measured piece, calculates and processes the relative distance to obtain the height required to be adjusted of the excitation coil, and controls the lifting of the excitation coil according to the calculated height required to be adjusted; and calculating and processing according to the relative distance to obtain the height required to be adjusted of the balance coil, and controlling the lifting and/or rotation of the balance coil according to the calculated height or angle required to be adjusted.

Preferably, the feedback control adjusting unit includes: the device comprises a distance signal extraction module, a distance signal receiving module, a calculation module, a control module and a power supply module; the power supply module is respectively connected with the control module and the exciting coil, and the control module controls the power supply module to supply power to the exciting coil;

the distance signal extraction module is used for respectively extracting the relative distance between the excitation coil and the detection coil relative to the surface of the detected piece and transmitting the extracted relative distance to the distance signal receiving module, the distance signal receiving module processes the relative distance and transmits the processed relative distance to the calculation module, and the calculation module analyzes and processes the relative position by using a built-in algorithm and calculates to obtain the change quantity of the coupling magnetic field A of the detection coil influenced by lift-off and/or vibration or the change quantity of the coupling magnetic field B influenced by lift-off and/or vibration;

when the wireless charging device stops detecting, the calculation module calculates the height of the exciting coil to be adjusted according to the variation of the coupling magnetic field A and transmits the height to the control module, and the control module controls the lifting mechanism to lift and/or controls the rotary lifting mechanism to lift and/or rotate so as to balance the variation of the lifting and/or vibration effect on the coupling magnetic field A;

when the wireless charging device is used for detection, the calculation module calculates the angle and/or height of the balance coil to be adjusted according to the change of the coupling magnetic field B and transmits the angle and/or height to the control module, and the control module controls the rotary lifting mechanism to drive the balance coil to lift and/or rotate so as to balance the change of the lifting and/or vibration effect on the original magnetic field or the coupling magnetic field B.

Preferably, the detection coil adopts an 8-shaped differential pickup coil.

Has the advantages that:

(1) the invention can detect the conductor foreign matters falling into the wireless charging device of the electric vehicle under the state that the wireless charging device is stopped and is not stopped, has simple structure and wide application range.

(2) The invention arranges a balance coil in the setting range of the detection coil for balancing the lifting and/or vibration effect of the detection device due to the working environment (such as uneven road surface).

Drawings

Fig. 1 is a schematic structural view of an exciting coil in the present invention.

Fig. 2 is a schematic structural view of a balance coil according to the present invention.

Fig. 3 is a schematic view of the structure of a detection coil in the present invention.

Fig. 4 is a front view showing the relative positions of the exciting coil, the balance coil and the detecting coil in state a of the present invention.

Fig. 5 is a right side view of the relative positions of the excitation coil, balance coil and detection coil in state a of the present invention.

Fig. 6 is a schematic diagram showing the relative positions of the excitation coil, the balance coil and the detection coil in state B of the present invention, (a) a front view, and (B) a right side view.

Fig. 7 is a schematic diagram showing the relative positions of the excitation coil, the balance coil and the detection coil in state C of the present invention, (a) a front view, and (b) a right side view.

Wherein, 1-exciting coil, 2-balance coil, 3-detecting coil, 4-shell

Detailed Description

The invention is described in detail below by way of example with reference to the accompanying drawings.