技术领域technical field
本发明涉及无线电能传输领域，更具体地说，涉及一种无线电能传输装置。The present invention relates to the field of wireless power transmission, and more specifically, to a wireless power transmission device.
背景技术Background technique
磁共振式的无线充电系统包括有电能发射端和电能接收端，如图1所示，电能发射端接收外部电能产生空间磁场将能量以无线方式传输给电能接收端。The magnetic resonance wireless charging system includes a power transmitter and a power receiver. As shown in Figure 1, the power transmitter receives external power to generate a spatial magnetic field and transmits the energy wirelessly to the power receiver.
为了能使电能接收端在更大范围内感生空间磁场以产生电压给电子设备,一种方式是采用增加电能发射端中发射线圈的尺寸和感值，但是增加发射线圈的尺寸和感值，往往需要增加发射线圈的匝数和面积，而根据电容的计算公式，C＝εS/D，增大线圈面积会增加发射线圈对地之间的寄生电容，根据共模电流ICM和寄生电容之间的关系，ICM＝CdV/dt。如图2所示，线圈上高频交流电压通过这个寄生电容更容易形成对大地共模电流，增加了EMC传导干扰。并且，当发射线圈的尺寸增加后，则线圈的周长相应会增加，如果线圈中流过高频交变的电流，那么高频电流更容易形成电磁波辐射出，增加EMC辐射干扰。In order to enable the power receiving end to induce a spatial magnetic field in a wider range to generate voltage for electronic equipment, one way is to increase the size and inductance of the transmitting coil in the power transmitting end, but increase the size and inductance of the transmitting coil, It is often necessary to increase the number of turns and area of the transmitting coil, and according to the capacitance calculation formula, C=εS/D, increasing the coil area will increase the parasitic capacitance between the transmitting coil and the ground, according to the common mode current ICM and the parasitic capacitance The relationship between ICM =CdV/dt. As shown in Figure 2, the high-frequency AC voltage on the coil is more likely to form a common-mode current to the ground through this parasitic capacitance, which increases EMC conduction interference. Moreover, when the size of the transmitting coil increases, the circumference of the coil increases accordingly. If a high-frequency alternating current flows through the coil, the high-frequency current is more likely to form electromagnetic waves to radiate out, increasing EMC radiation interference.
另一种方式是通过增加发射线圈中的交变电流，来增加发射线圈的磁场，这种方式会增加发射线圈两端的电压(V＝jωLs·Is)，需要更大耐压值的谐振电容Cs与发射线圈Ls在系统工作频率点上谐振，并且发射线圈的电压增加后，根据上述共模电流的计算公式，也会增加对地的共模电流。Another way is to increase the magnetic field of the transmitting coil by increasing the alternating current in the transmitting coil, which will increase the voltage across the transmitting coil (V=jωLs·Is), requiring a resonant capacitor Cs with a greater withstand voltage value It resonates with the transmitting coil Ls at the system operating frequency point, and after the voltage of the transmitting coil increases, according to the calculation formula of the above common mode current, the common mode current to the ground will also increase.
发明内容Contents of the invention
有鉴于此，本发明提出了一种无线电能传输装置。通过多个子补偿电容对电能发射线圈(或电能接收线圈)进行分段补偿，以使得每段电能发射线圈(或电能接收线圈)的电压能够降低，从而减小发射线圈(或接收线圈)对地的共模电流。In view of this, the present invention proposes a wireless power transmission device. Compensate the power transmitting coil (or power receiving coil) in sections through multiple sub-compensation capacitors, so that the voltage of each section of power transmitting coil (or power receiving coil) can be reduced, thereby reducing the transmission coil (or receiving coil) to the ground common mode current.
第一方面，依据本发明的一种无线电能传输装置，包括电能发射部分和电能接收部分，所述电能发射部分包括逆变电路、电能发射线圈和原边补偿电容，In the first aspect, a wireless power transmission device according to the present invention includes a power transmitting part and a power receiving part, and the power transmitting part includes an inverter circuit, a power transmitting coil and a primary side compensation capacitor,
所述逆变电路接收直流电压信号以输出交流电压信号；The inverter circuit receives a DC voltage signal to output an AC voltage signal;
所述电能发射线圈用于接收所述交流电压信号，以向所述电能接收部分传输能量；The power transmitting coil is used to receive the AC voltage signal to transmit energy to the power receiving part;
所述原边补偿电容用以补偿所述电能发射线圈的电感，以使得所述电能发射线圈和所述原边补偿电容的谐振频率与系统工作频率一致；The primary side compensation capacitor is used to compensate the inductance of the power transmitting coil, so that the resonant frequency of the power transmitting coil and the primary side compensation capacitor is consistent with the system operating frequency;
所述原边补偿电容包括N个子补偿电容，所述N个子补偿电容分布式连接在所述电能发射线圈中的不同位置；The primary-side compensation capacitor includes N sub-compensation capacitors, and the N sub-compensation capacitors are distributed and connected to different positions in the power transmitting coil;
所述电能接收部分接收从电能发射部分传输的能量，以产生预定的输出电压供给负载。The power receiving part receives the energy transmitted from the power transmitting part to generate a predetermined output voltage for the load.
优选地，所述电能发射线圈的电感包括所述电能发射线圈结构的漏感和激磁电感。Preferably, the inductance of the power transmitting coil includes leakage inductance and magnetizing inductance of the power transmitting coil structure.
优选地，所述N个子补偿电容连接在所述电能发射线圈的不同位置，以将所述电能发射线圈分为N段线圈。Preferably, the N sub-compensation capacitors are connected to different positions of the power transmitting coil, so as to divide the power transmitting coil into N coil segments.
优选地，所述N个子补偿电容均分地连接在所述电能发射线圈的不同位置，以将所述电能发射线圈均分为N等份。Preferably, the N sub-compensation capacitors are evenly connected to different positions of the power transmitting coil, so as to divide the power transmitting coil into N equal parts.
优选地，所述N个子补偿电容的容值为相等。Preferably, the capacitance values of the N sub-compensation capacitors are equal.
优选地，所述N个子补偿电容的中一个电容和所述电能发射线圈中的相应地一段线圈谐振，并且，两者谐振频率与系统工作频率一致。Preferably, one of the N sub-compensation capacitors resonates with a corresponding segment of the power transmitting coil, and the resonant frequency of the two is consistent with the operating frequency of the system.
第二方面，依据本发明的一种无线电能传输装置，包括电能发射部分和电能接收部分，所述电能接收部分包括电能接收线圈和副边补偿电容，In the second aspect, a wireless power transmission device according to the present invention includes a power transmitting part and a power receiving part, and the power receiving part includes a power receiving coil and a secondary side compensation capacitor,
所述副边补偿电容用以补偿所述电能接收线圈的电感，以使得所述电能接收线圈和所述副边补偿电容的谐振频率与系统工作频率一致；The secondary side compensation capacitor is used to compensate the inductance of the power receiving coil, so that the resonant frequency of the power receiving coil and the secondary side compensation capacitor is consistent with the system operating frequency;
所述副边补偿电容包括N个子补偿电容，所述N个子补偿电容分布式连接在所述电能接收线圈中的不同位置。The secondary compensation capacitor includes N sub-compensation capacitors, and the N sub-compensation capacitors are distributed and connected to different positions in the power receiving coil.
优选地，所述电能接收线圈的电感包括所述电能接收线圈的漏感和激磁电感。Preferably, the inductance of the power receiving coil includes leakage inductance and magnetizing inductance of the power receiving coil.
优选地，所述副边补偿电容的N个子补偿电容均分地连接在所述电能接收线圈的不同位置，以将所述电能接收线圈均分为N等份。Preferably, the N sub-compensation capacitors of the secondary compensation capacitor are equally connected to different positions of the power receiving coil, so as to divide the power receiving coil into N equal parts.
优选地，所述副边补偿电容的N个子补偿电容的容值为相等；Preferably, the capacitance values of the N sub-compensation capacitors of the secondary compensation capacitor are equal;
所述副边补偿电容的N个子补偿电容的中一个电容和所述电能接收线圈的中相应地一段线圈谐振，并且，其谐振频率与系统工作频率一致。One of the N sub-compensation capacitors of the secondary compensation capacitor resonates with a corresponding section of the power receiving coil, and its resonant frequency is consistent with the system operating frequency.
进一步地，所述电能接收部分还包括屏蔽层，所述屏蔽层放置于所述电能接收线圈和电子设备之间。Further, the power receiving part further includes a shielding layer, and the shielding layer is placed between the power receiving coil and the electronic device.
优选地，所述屏蔽层包括磁屏蔽层，所述磁屏蔽层放置于所述电能接收线圈和电子设备之间。Preferably, the shielding layer includes a magnetic shielding layer, and the magnetic shielding layer is placed between the power receiving coil and the electronic device.
优选地，所述电磁屏蔽层包括磁屏蔽层和铜屏蔽层，所述磁屏蔽层和铜屏蔽层依次放置于电能接收线圈和电子设备之间。Preferably, the electromagnetic shielding layer includes a magnetic shielding layer and a copper shielding layer, and the magnetic shielding layer and the copper shielding layer are sequentially placed between the power receiving coil and the electronic device.
优选地，所述磁屏蔽层包括空心区域和实心区域。Preferably, the magnetic shielding layer includes hollow regions and solid regions.
优选地，所述N个子补偿电容连接在所述电能接收线圈的线圈管脚出口处。Preferably, the N sub-compensation capacitors are connected to coil pin outlets of the power receiving coil.
优选地，所述N个子补偿电容分布连接在所述电能接收线圈的之中，并且所述N个子补偿电容放置于所述磁屏蔽层的空心区域。Preferably, the N sub-compensation capacitors are distributed and connected among the power receiving coils, and the N sub-compensation capacitors are placed in the hollow area of the magnetic shielding layer.
优选地，所述电能接收部分还包括整流电路和直流-直流电压转换电路，Preferably, the power receiving part further includes a rectification circuit and a DC-DC voltage conversion circuit,
所述整流电路和直流-直流电压转换电路的电子设备器件放置于所述磁屏蔽层的空心区域；The electronic equipment components of the rectification circuit and the DC-DC voltage conversion circuit are placed in the hollow area of the magnetic shielding layer;
所述N个子补偿电容连接在所述电能接收线圈的线圈管脚出口处，所述电能接收线圈的线圈管脚连接到所述电子设备器件。The N sub-compensation capacitors are connected to the outlet of the coil pin of the power receiving coil, and the coil pin of the power receiving coil is connected to the electronic device.
综上所述，根据本发明的无线电能传输装置。通过将原边补偿电容设置为包含N个子补偿电容，所述N个子补偿电容均分连接在电能发射线圈中，以将电能发射线圈相应地均分为N等份。所述N个子补偿电容的中一个电容和所述电能发射线圈的中的相应地一段线圈谐振，并且，其谐振频率与所述系统工作频率一致。通过上述的分布式电容连接结构，可以使得每段电能发射线圈的电压能够降低，从而减小发射线圈对地的共模电流。但总的原边补偿电容和电能发射线圈的谐振频率与系统工作频率一致，可以保证能量传输效率最高。In summary, the wireless power transmission device according to the present invention. By setting the primary side compensation capacitor to include N sub-compensation capacitors, the N sub-compensation capacitors are evenly connected in the power transmitting coil, so that the power transmitting coil is correspondingly divided into N equal parts. One of the N sub-compensation capacitors resonates with a corresponding segment of the power transmitting coil, and its resonant frequency is consistent with the operating frequency of the system. Through the above-mentioned distributed capacitance connection structure, the voltage of each segment of the power transmitting coil can be reduced, thereby reducing the common mode current of the transmitting coil to the ground. However, the resonant frequency of the total primary side compensation capacitor and the power transmitting coil is consistent with the operating frequency of the system, which can ensure the highest energy transmission efficiency.
另一方面，本发明的无线电能传输装置将副边补偿电容设置为包括N个子补偿电容，以将电能接收线圈分为N等份，同样可使得每段电能接收线圈的电压能够降低，从而减小接收线圈对电子设备的金属或者是铜屏蔽层的环流，提高能量传输效率。On the other hand, in the wireless power transmission device of the present invention, the secondary side compensation capacitor is set to include N sub-compensation capacitors to divide the power receiving coil into N equal parts, which can also reduce the voltage of each power receiving coil, thereby reducing The small receiving coil circulates the metal or copper shielding layer of the electronic equipment to improve the energy transmission efficiency.
附图说明Description of drawings
图1所示为现有技术的无线充电系统的结构；FIG. 1 shows the structure of a wireless charging system in the prior art;
图2所示为发射线圈对地产生的共模电流的示意图；Figure 2 is a schematic diagram of the common mode current generated by the transmitting coil to the ground;
图3所示为依据本发明的无线电能传输装置中的电能发射线圈部分的一种示意图；FIG. 3 is a schematic diagram of the power transmitting coil part in the wireless power transmission device according to the present invention;
图4所示为依据本发明的无线电能传输装置的第一实施例的电路图；FIG. 4 is a circuit diagram of a first embodiment of a wireless power transmission device according to the present invention;
图5所示为依据本发明的无线电能传输装置的第二实施例的电路图；FIG. 5 is a circuit diagram of a second embodiment of a wireless power transmission device according to the present invention;
图6所示为依据本发明的无线电能传输装置的第三实施例的电路图；FIG. 6 is a circuit diagram of a third embodiment of a wireless power transmission device according to the present invention;
图7所示为依据本发明的无线电能传输装置的第四实施例的电路图；FIG. 7 is a circuit diagram of a fourth embodiment of a wireless power transmission device according to the present invention;
图8所示为依据本发明的无线电能传输装置的第五实施例的电路图；FIG. 8 is a circuit diagram of a fifth embodiment of a wireless power transmission device according to the present invention;
图9所示为依据本发明的无线电能传输装置的第六实施例的电路图；FIG. 9 is a circuit diagram of a sixth embodiment of a wireless power transmission device according to the present invention;
图10所示为依据本发明的无线电能传输装置的第七实施例的电路图。FIG. 10 is a circuit diagram of a seventh embodiment of a wireless power transmission device according to the present invention.
具体实施方式detailed description
以下将结合附图详细说明本发明的一些优选实施例，但本发明不限于此。Some preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited thereto.
参考图3所示为依据本发明的无线电能传输装置中的电能发射线圈部分的一种示意图，所述电能发射线圈部分包括有逆变电路(图3中未示出)，逆变电路用于将外部直流电压信号转换为交流电压信号输出，所述交流电压信号传输给所述电能发射线圈。Referring to FIG. 3, it is a schematic diagram of the power transmission coil part in the wireless power transmission device according to the present invention, the power transmission coil part includes an inverter circuit (not shown in FIG. 3), and the inverter circuit is used for The external DC voltage signal is converted into an AC voltage signal for output, and the AC voltage signal is transmitted to the power transmitting coil.
所述电能发射线圈部分还包括电能发射线圈和原边补偿电容，所述原边补偿电容用以补偿所述电能发射线圈的电感，以使得所述电能发射线圈和所述原边补偿电容的谐振频率与系统工作频率一致；这里，所述电能发射线圈的电感包括所述电能发射线圈结构中的漏感和激磁电感，所述电能发射线圈的电感为基本恒定的值，补偿电容的阻抗与励磁电感和漏感两部分的感抗谐振工作。所述系统工作频率为无线电能传输装置的工作频率，记为ω0，所述无线电能传输装置的系统工作频率是根据电路结构和效率要求预先设定的，例如优选频率设置为6.78MHz。The power transmission coil part also includes a power transmission coil and a primary side compensation capacitor, and the primary side compensation capacitor is used to compensate the inductance of the power transmission coil, so that the resonance of the power transmission coil and the primary side compensation capacitor The frequency is consistent with the operating frequency of the system; here, the inductance of the power transmitting coil includes leakage inductance and excitation inductance in the structure of the power transmitting coil, the inductance of the power transmitting coil is a substantially constant value, the impedance of the compensation capacitor and the excitation The inductive reactance of the inductance and leakage inductance works in resonance. The system working frequency is the working frequency of the wireless power transmission device, denoted as ω0 . The system working frequency of the wireless power transmission device is preset according to the circuit structure and efficiency requirements, for example, the preferred frequency is set to 6.78MHz.
本实施方式中，所述原边补偿电容包括N个子补偿电容，所述N个子补偿电容分布式连接在所述电能发射线圈中的不同位置，其中，N为大于1的正整数。如图3所示，以N为3为例，所述原边补偿电容包括子补偿电容Cs1、子补偿电容Cs2、子补偿电容Cs3。In this embodiment, the primary-side compensation capacitor includes N sub-compensation capacitors, and the N sub-compensation capacitors are distributed and connected to different positions in the power transmitting coil, where N is a positive integer greater than 1. As shown in FIG. 3 , taking N as 3 as an example, the primary side compensation capacitors include sub-compensation capacitors Cs1 , sub-compensation capacitors Cs2 , and sub-compensation capacitors Cs3 .
更进一步地，如图3所示，所述N个子补偿电容均分地连接在所述电能发射线圈的不同位置，以将所述电能发射线圈均分为N等份。图3中所示的3个子补偿电容将电能发射线圈均分为三等份，如线圈AB段、线圈CD段以及线圈DF段。为了更优化参数的设计，这里所述3个子补偿电容的容值为相等，并且，电容Cs1与相邻一段的发射线圈如AB段谐振，且谐振频率也为系统工作频率6.78MHz。Furthermore, as shown in FIG. 3 , the N sub-compensation capacitors are evenly connected to different positions of the power transmitting coil, so as to divide the power transmitting coil into N equal parts. The three sub-compensation capacitors shown in FIG. 3 divide the power transmitting coil into three equal parts, such as the coil AB section, the coil CD section and the coil DF section. In order to optimize the parameter design, the capacitance values of the three sub-compensation capacitors are equal, and the capacitor Cs1 resonates with the adjacent segment of the transmitting coil, such as the AB segment, and the resonant frequency is also the system operating frequency of 6.78 MHz.
如图4所示为图3中的分布式电能发射线圈应用在无线电能传输装置中的应用电路图，图4中无线电能传输装置还包括电能接收部分(包括电能接收线圈Ld和副边补偿电容Cd)。如图4所示，三个子补偿电容分别记为Cs1、Cs2、Cs3，三段发射线圈分别记为Ls1、Ls2、Ls3，设总的发射线圈的电感为Ls，总的补偿电容的Cs，则根据图4所示的分布式结构，则各个子补偿电容的容值设置为Cs1＝Cs2＝Cs3＝3Cs，各分段线圈的感值为Ls1＝Ls2＝Ls3＝Ls/3，这样，各分段线圈两端的电压为VLs/3。As shown in Figure 4, it is an application circuit diagram of the distributed power transmitting coil in Figure 3 applied in a wireless power transmission device, and the wireless power transmission device in Figure 4 also includes a power receiving part (including a power receiving coil Ld and a secondary side compensation capacitor Cd ). As shown in Figure 4, the three sub-compensation capacitors are respectively marked as Cs1, Cs2, and Cs3, and the three transmitting coils are respectively marked as Ls1, Ls2, and Ls3. Let the total inductance of the transmitting coil be Ls, and the total compensation capacitor Cs, then According to the distributed structure shown in Fig. 4, the capacity value of each sub-compensation capacitor is set as Cs1=Cs2=Cs3=3Cs, and the inductance value of each sub-coil is Ls1=Ls2=Ls3=Ls/3, like this, each sub-coil The voltage across the segment coil is VLs/3.
这样，线圈Ls1两端的电压变为VLs1＝VLs/3；由于子补偿电容Cs1和线圈Ls1在工作频率点上谐振，那么补偿电容Cs1和线圈Ls1两端的等效阻抗为0，In this way, the voltage at both ends of the coil Ls1 becomes VLs1=VLs/3; since the sub-compensation capacitor Cs1 and the coil Ls1 resonate at the operating frequency point, the equivalent impedance at both ends of the compensation capacitor Cs1 and the coil Ls1 is 0,
即1/jωCs1+jωLs1＝0，That is, 1/jωCs1+jωLs1=0,
补偿电容Cs1和线圈Ls1两端的电压之和为0(即VLs1+VCs1＝0)，线圈上能量能得到最大程度的传输，传输效率高。The sum of the voltages across the compensation capacitor Cs1 and the coil Ls1 is 0 (that is, VLs1+VCs1=0), the energy on the coil can be transmitted to the maximum extent, and the transmission efficiency is high.
同理，所以线圈Ls2段两端的电压VLs2＝VLs/3，同理，子补偿电容Cs2和线圈Ls2在工作频率点上谐振，补偿电容Cs2和线圈Ls2两端的电压之和为0，线圈Ls3两端的电压VLs3＝VLs/3，同理，子补偿电容Cs3和线圈Ls3在工作频率点上谐振，补偿电容Cs3和线圈Ls3两端的电压之和为0。In the same way, the voltage at both ends of the coil Ls2 section is VLs2=VLs/3. Similarly, the sub-compensation capacitor Cs2 and the coil Ls2 resonate at the operating frequency point, and the sum of the voltages at the two ends of the compensation capacitor Cs2 and the coil Ls2 is 0, and the two coils of the coil Ls3 Terminal voltage VLs3=VLs/3, similarly, the sub-compensation capacitor Cs3 and the coil Ls3 resonate at the operating frequency point, and the sum of the voltages across the compensation capacitor Cs3 and the coil Ls3 is zero.
从上可以看出，相比于对整个线圈进行补偿而言，采用分布式补偿方式，每段线圈两端的电压从原来VLs减小到分布式的VLs/N，那么根据背景技术中的共模电流的计算公式，发射线圈对地的共模电流也降低到原来的1/N。本发明实施例非常适用于发射线圈尺寸较大的场合，由于尺寸大则对地的共模电容大，通过分段串联电容的方式来降低线圈中的跳变电压，可以很好地减小共模电流，降低EMC的传导干扰。It can be seen from the above that, compared to the compensation for the entire coil, the distributed compensation method reduces the voltage across each segment of the coil from the original VLs to the distributed VLs/N, so according to the common mode in the background technology The calculation formula of the current, the common mode current of the transmitting coil to the ground is also reduced to the original 1/N. The embodiment of the present invention is very suitable for occasions where the size of the transmitting coil is large. Since the size is large, the common-mode capacitance to the ground is large, and the jump voltage in the coil can be reduced by segmented series capacitance, which can well reduce the common-mode capacitance. Mode current, reduce EMC conduction interference.
通过上述的发射线圈的结构可以看出，发射线圈两端的补偿电容耐压值也从VLs也变化到VLs/3，因此可以选取耐压值更小的阻抗匹配电容，降低了成本。并且分段线圈两端的电压降低后，更增加了系统的可靠性。It can be seen from the above structure of the transmitting coil that the withstand voltage value of the compensation capacitor at both ends of the transmitting coil also changes from VLs to VLs/3, so an impedance matching capacitor with a lower withstand voltage value can be selected to reduce the cost. And after the voltage at both ends of the segmented coil is reduced, the reliability of the system is further increased.
需要说明的是，即使该分布式电能发射线圈的参数设计没有上述的最优化的均等份设计，例如，所述N个子补偿电容连接在所述电能发射线圈的不同位置，以将所述电能发射线圈分为N段线圈。但是只要整体满足N段分布式电感串联Ls1+Ls2+…Lsn＝Ls和N个分布式电容串联Cs1＝Cs2＝Csn＝NCs，则系统的能量传输效率均不会下降，且分布式分段线圈上的电压都会有所下降，降低EMC传导干扰。It should be noted that even if the parameter design of the distributed power transmitting coil does not have the above-mentioned optimized equal portion design, for example, the N sub-compensation capacitors are connected to different positions of the power transmitting coil to transmit the power The coil is divided into N segment coils. However, as long as N segments of distributed inductors in series Ls1+Ls2+...Lsn=Ls and N distributed capacitors in series Cs1=Cs2=Csn=NCs are satisfied, the energy transmission efficiency of the system will not decrease, and the distributed segmented coils The voltage will be reduced to reduce EMC conduction interference.
图5所示为依据本发明的无线电能传输装置的第二实施例的电路图；在本实施例中，所述发射线圈部分包括N个子补偿电容(Cs1….Csn),相应地，所述电能发射线圈被等分为N等份(Ls1….Lsn)，这里，所述N个子补偿电容的容值可以相等或不相等，所述N段发射线圈的阻抗也可以为相等或不相等，但所述发射线圈的总阻抗和所述N个子补偿电容的总阻抗的谐振频率与系统工作频率一致，以保证传输效率的最大化，这样通过对发射线圈的分段补偿，可以是的发射线圈的压降大幅减小，从而减小共模电流。N为大于1的正整数，子补偿电容的个数是根据用户对共模电流的要求和成本共同决定的，例如对共模电流要求高的可以提高子补偿电容的个数，对成本有限制的则减少子补偿电容的个数。Fig. 5 is a circuit diagram according to the second embodiment of the wireless power transmission device of the present invention; in this embodiment, the transmitting coil part includes N sub-compensation capacitors (Cs1....Csn), correspondingly, the electric energy The transmitting coil is divided into N equal parts (Ls1....Lsn). Here, the capacitance values of the N sub-compensation capacitors can be equal or unequal, and the impedances of the N segments of the transmitting coil can also be equal or unequal, but The resonant frequency of the total impedance of the transmitting coil and the total impedance of the N sub-compensation capacitors is consistent with the operating frequency of the system to ensure the maximum transmission efficiency. In this way, the segmental compensation of the transmitting coil can be the The voltage drop is greatly reduced, reducing common-mode currents. N is a positive integer greater than 1, and the number of sub-compensation capacitors is determined according to the user's requirements for common-mode current and cost. For example, if the requirement for common-mode current is high, the number of sub-compensation capacitors can be increased, and the cost is limited. The number of sub-compensation capacitors is reduced.
图6所示为依据本发明的无线电能传输装置的第三实施例的电路图。在本实施例中，电能发射线圈与图5中均一致，在此不再赘述。本实施例中，所述副边补偿电容用以补偿所述电能接收线圈的电感，以使得所述电能接收线圈和所述副边补偿电容的谐振频率与系统工作频率一致；所述电能接收线圈的电感包括所述电能接收线圈结构中的漏感和激磁电感。FIG. 6 is a circuit diagram of a third embodiment of a wireless power transmission device according to the present invention. In this embodiment, the power transmitting coil is the same as that in FIG. 5 , and will not be repeated here. In this embodiment, the secondary compensation capacitor is used to compensate the inductance of the power receiving coil, so that the resonant frequency of the power receiving coil and the secondary compensation capacitor is consistent with the system operating frequency; the power receiving coil The inductance includes leakage inductance and magnetizing inductance in the power receiving coil structure.
本实施例中，所述副边补偿电容包括N个子补偿电容(Cd1….Cdn)，所述N个子补偿电容分布式连接在所述电能发射线圈中的不同位置；更进一步地，所述N个子补偿电容的容值为相等；所述副边补偿电容的N个子补偿电容均分地连接在所述电能接收线圈的不同位置，以将所述电能接收线圈均分为N等份(如Ld1….Ldn)，并且所述N个子补偿电容的中一个电容和所述电能接收线圈中的相应地一段线圈谐振，(如Cd1和Ld1谐振)，并且，其谐振频率与系统工作频率(6.78MHz)一致。In this embodiment, the secondary side compensation capacitor includes N sub-compensation capacitors (Cd1...Cdn), and the N sub-compensation capacitors are distributed and connected to different positions in the power transmitting coil; further, the N The capacitance values of the sub-compensation capacitors are equal; the N sub-compensation capacitors of the secondary side compensation capacitors are equally connected to different positions of the power receiving coil, so that the power receiving coil is divided into N equal parts (such as Ld1 ....Ldn), and one of the N sub-compensation capacitors resonates with a corresponding segment of the coil in the power receiving coil, (such as Cd1 and Ld1 resonance), and its resonant frequency is the same as the system operating frequency (6.78MHz ) consistent.
同理，对于副边而言，通过上述分段式接收线圈的方式，可以使得每一段接收线圈上的压降减小，从而对地的共模电流得以减小，降低系统的EMC干扰。In the same way, for the secondary side, the above-mentioned segmented receiving coil can reduce the voltage drop on each segment of the receiving coil, thereby reducing the common mode current to the ground and reducing the EMC interference of the system.
图7所示为依据本发明的无线电能传输装置的第四实施例的电路图。在本实施例中，所述电能接收部分还包括屏蔽层，所述屏蔽层放置于所述电能接收线圈和电子设备之间。FIG. 7 is a circuit diagram of a fourth embodiment of a wireless power transmission device according to the present invention. In this embodiment, the power receiving part further includes a shielding layer, and the shielding layer is placed between the power receiving coil and the electronic device.
在实际应用中，所述电磁屏蔽层包括磁屏蔽层和铜屏蔽层，所述磁屏蔽层和铜屏蔽层依次放置于电能接收线圈和电子设备之间。如图7所示，所述磁屏蔽层包括空心区域和实心区域，空心区域如图7中的镂空部分。子补偿电容CS1和CS2连接在接收线圈的中间，以将接收线圈均分为三等份。In practical applications, the electromagnetic shielding layer includes a magnetic shielding layer and a copper shielding layer, and the magnetic shielding layer and the copper shielding layer are sequentially placed between the power receiving coil and the electronic device. As shown in FIG. 7 , the magnetic shielding layer includes a hollow area and a solid area, and the hollow area is the hollow part in FIG. 7 . The sub-compensation capacitors CS1 and CS2 are connected in the middle of the receiving coil to divide the receiving coil into three equal parts.
容易理解，在要求不高的场合，所述屏蔽层可以只包括磁屏蔽层，所述磁屏蔽层放置于所述电能接收线圈和电子设备之间。It is easy to understand that, in occasions with low requirements, the shielding layer may only include a magnetic shielding layer, and the magnetic shielding layer is placed between the power receiving coil and the electronic device.
由于接收线圈和铜皮(或电子设备的金属)之间是磁屏蔽层，磁片的介电常数比空气高很多(ε＞10ε0)，同时接收线圈和铜皮的间距也较小，因此形成的寄生电容也会很大，根据背景技术中的计算公式，接收线圈和铜片(或金属)时间的环流会很大。在本实施例中，通过将接收线圈分成多段分线圈结构，根据上述发射线圈的计算过程可以推知，接收线圈的每段分线圈的电压将会大大减小，从而降低接收线圈对铜片或金属的环流，可以有效提高能量传输的效率。Since there is a magnetic shielding layer between the receiving coil and the copper skin (or the metal of the electronic device), the dielectric constant of the magnetic sheet is much higher than that of air (ε>10ε0 ), and the distance between the receiving coil and the copper skin is also small, so The formed parasitic capacitance will also be very large, and according to the calculation formula in the background art, the circulating current between the receiving coil and the copper sheet (or metal) will be very large. In this embodiment, by dividing the receiving coil into multiple sub-coil structures, it can be deduced according to the calculation process of the above-mentioned transmitting coil that the voltage of each sub-coil of the receiving coil will be greatly reduced, thereby reducing the impact of the receiving coil on copper or metal. The circulation can effectively improve the efficiency of energy transmission.
图8所示为依据本发明的无线电能传输装置的第五实施例的电路图。本实施例是在图7实施例上的进一步改进，所述磁片的空心区域包括镂空1和镂空2，其中所述子补偿电容Cs1和Cs2分布连接在所述电能接收线圈的之中，并且所述子补偿电容放置于所述磁屏蔽层的空心区域，如图8中镂空2的位置。这样，补偿电容可以很好的均分接收线圈，并且，没有增加整体的厚度。FIG. 8 is a circuit diagram of a fifth embodiment of a wireless power transmission device according to the present invention. This embodiment is a further improvement on the embodiment in FIG. 7 , the hollow area of the magnetic sheet includes a hollow 1 and a hollow 2, wherein the sub-compensation capacitors Cs1 and Cs2 are distributed and connected among the power receiving coils, and The sub-compensation capacitor is placed in the hollow area of the magnetic shielding layer, such as the position of the hollow 2 in FIG. 8 . In this way, the compensation capacitor can equally divide the receiving coil without increasing the overall thickness.
图9所示为依据本发明的无线电能传输装置的第六实施例的电路图。在本实施例中，所述N个子补偿电容连接在所述电能接收线圈的线圈管脚出口处。例如，图9中的子补偿电容CS1和CS2连接在线圈管脚出口处，这样有利于接收线圈的工艺操作以及线圈和磁片的集成。FIG. 9 is a circuit diagram of a sixth embodiment of a wireless power transmission device according to the present invention. In this embodiment, the N sub-compensation capacitors are connected to the outlet of the coil pin of the power receiving coil. For example, the sub-compensation capacitors CS1 and CS2 in FIG. 9 are connected at the outlet of the coil pin, which is beneficial to the process operation of the receiving coil and the integration of the coil and the magnetic sheet.
图10为依据本发明的无线电能传输装置的第七实施例的电路图。在本实施例中，所述电能接收部分还包括整流电路和直流-直流电压转换电路，所述整流电路和直流-直流电压转换电路的电子设备器件放置于所述磁屏蔽层的空心区域，如图10中的器件，子补偿电容如CS1和CS2连接在所述电能接收线圈的线圈管脚出口处，所述电能接收线圈的线圈管脚连接到所述电子设备器件。这样，可以使得子补偿电容如CS1和CS2、以及实现电能转换功能的电子元器件或部分电子元器件置于磁片的镂空区域内的电路板上，可以节省空间，更有利于集成到电子设备内部。FIG. 10 is a circuit diagram of a seventh embodiment of a wireless power transmission device according to the present invention. In this embodiment, the power receiving part further includes a rectification circuit and a DC-DC voltage conversion circuit, and the electronic equipment components of the rectification circuit and the DC-DC voltage conversion circuit are placed in the hollow area of the magnetic shielding layer, such as In the device in FIG. 10 , the sub-compensation capacitors such as CS1 and CS2 are connected at the outlet of the coil pin of the power receiving coil, and the coil pin of the power receiving coil is connected to the electronic device. In this way, the sub-compensation capacitors such as CS1 and CS2, and the electronic components or some electronic components that realize the power conversion function can be placed on the circuit board in the hollow area of the magnetic sheet, which can save space and is more conducive to integration into electronic equipment internal.
需要说明的是，上述实施例可以结合或分开使用，例如电能发射线圈为分布式电容结构，或者是电能接收线圈为分布式电容结构，或者是电能发射线圈和电能接收线圈同时为分布式电容结构，用户可以根据需求来进行选择。It should be noted that the above embodiments can be used in combination or separately, for example, the power transmitting coil is a distributed capacitance structure, or the power receiving coil is a distributed capacitance structure, or the power transmitting coil and the power receiving coil are both distributed capacitance structures , users can choose according to their needs.
以上对依据本发明的优选实施例的无线电能传输装置进行了详尽描述，但关于该专利的电路和有益效果不应该被认为仅仅局限于上述所述的，公开的实施例和附图可以更好的理解本发明，因此，上述公开的实施例及说明书附图内容是为了更好的理解本发明，本发明保护并不限于限定本公开的范围，本领域普通技术人员对本发明实施例的替换、修改均在本发明的保护范围之内。The wireless power transmission device according to the preferred embodiment of the present invention has been described in detail above, but the circuit and beneficial effects of this patent should not be considered to be limited to the above, and the disclosed embodiments and drawings can be better understanding of the present invention, therefore, the above disclosed embodiments and the contents of the accompanying drawings are for a better understanding of the present invention, the protection of the present invention is not limited to limit the scope of the present disclosure, and the replacement, All modifications are within the protection scope of the present invention.
| Application Number | Priority Date | Filing Date | Title |
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| CN202110113822.0ACN112688439A (en) | 2016-05-06 | 2016-07-28 | Wireless power transmission device |
| US15/581,754US20170324281A1 (en) | 2016-05-06 | 2017-04-28 | Wireless power trnsfer device |
| Application Number | Priority Date | Filing Date | Title |
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| CN201610300042 | 2016-05-06 | ||
| CN2016103000426 | 2016-05-06 |
| Application Number | Title | Priority Date | Filing Date |
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| CN202110113822.0ADivisionCN112688439A (en) | 2016-05-06 | 2016-07-28 | Wireless power transmission device |
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| CN107346918Atrue CN107346918A (en) | 2017-11-14 |
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| CN201610619347.3APendingCN107346918A (en) | 2016-05-06 | 2016-07-28 | A wireless power transmission device |
| CN202110113822.0APendingCN112688439A (en) | 2016-05-06 | 2016-07-28 | Wireless power transmission device |
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| CN202110113822.0APendingCN112688439A (en) | 2016-05-06 | 2016-07-28 | Wireless power transmission device |
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| Date | Code | Title | Description |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication | Application publication date:20171114 |