WO2011160406A1 - 无线供电系统及其自适应调整方法 - Google Patents

无线供电系统及其自适应调整方法 Download PDF

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Publication number
WO2011160406A1
WO2011160406A1 PCT/CN2010/080170 CN2010080170W WO2011160406A1 WO 2011160406 A1 WO2011160406 A1 WO 2011160406A1 CN 2010080170 W CN2010080170 W CN 2010080170W WO 2011160406 A1 WO2011160406 A1 WO 2011160406A1
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WO
WIPO (PCT)
Prior art keywords
current
transmitting coil
power supply
supply system
wireless power
Prior art date
Application number
PCT/CN2010/080170
Other languages
English (en)
French (fr)
Inventor
李聃
白冰
陈莹
徐一龙
Original Assignee
海尔集团公司
青岛海尔电子有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 海尔集团公司, 青岛海尔电子有限公司 filed Critical 海尔集团公司
Priority to EP10853544.4A priority Critical patent/EP2587626A4/en
Priority to JP2013515669A priority patent/JP2013532463A/ja
Priority to US13/701,005 priority patent/US9225390B2/en
Publication of WO2011160406A1 publication Critical patent/WO2011160406A1/zh

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H04B5/266—One coil at each side, e.g. with primary and secondary coils

Definitions

  • the present invention relates to a wireless power supply technology, and in particular to a self-adaptive adjustment method for a wireless power supply system and a corresponding wireless power supply system.
  • Wireless technology has long remained in the field of information applications, such as the wireless transmission of signals, and its power transmission characteristics have not been developed as it should. Therefore, the electronic devices that people use every day must be equipped with a dedicated power adapter to electrically connect to AC mains or configure the battery to provide power to the electronic device.
  • the existing power adapter needs to be electrically connected to the electronic device by the power cord, and the limitation of the power cord makes the electronic device extremely inconvenient to move.
  • wireless power supply technology has been developed that uses wireless methods to transmit electrical energy to electronic devices. Please refer to the picture
  • the existing wireless power supply system 100 includes a power transmitting unit 110 and a power receiving unit 120, wherein the power transmitting unit 110 generally includes a power supply 111, a control circuit 112, an oscillating circuit 113, and a transmitting coil 114;
  • the receiving unit 120 generally includes a receiving coil 121 and a rectifying and filtering circuit 122.
  • the power supply 111 of the power transmitting unit 110 is used to convert the AC mains into the DC voltage required by each circuit in the power transmitting unit 110 (for example, the control circuit 112 and the oscillation circuit 113), and the oscillation circuit 113 is used to generate a DC voltage.
  • the frequency signal, the control circuit 112 is electrically connected to the oscillation circuit 113 to control the main oscillation frequency f0 of the frequency signal generated by the oscillation circuit 113, and the transmission coil 114 generates a resonance frequency fl according to the main oscillation frequency f0 of the frequency signal to output electric power.
  • the receiving coil 121 in the power receiving unit 120 is electromagnetically coupled with the transmitting coil 114 to receive the power output by the power transmitting unit 110 to generate an alternating voltage having a certain resonant frequency G, and the rectifying and filtering circuit 122 is configured to convert the alternating current voltage into a direct current. Voltage.
  • the main oscillation frequency fO of the frequency signal generated by the oscillation circuit 113, the resonance frequency fl of the transmission coil 114, and the resonance frequency of the reception coil 121 are ideal.
  • the resonant frequencies fl and f2fl, £2 of the transmitting coil 114 and the receiving coil 121 may drift, causing the resonance of the transmitting coil 114 and the receiving coil 121.
  • the difference between the frequency fl and the £2 is large and does not match each other, and deep electromagnetic coupling cannot be performed. Therefore, the output power of the wireless power supply system 100 is unstable, and normal operation cannot be performed.
  • the invention provides an adaptive adjustment method for a wireless power supply system, which can automatically adjust the main vibration frequency so that the main vibration frequency is always close to the resonance frequency of the power transmission unit and the power receiving unit coil, so that the system maintains a stable power output. Achieve relative stability of the system.
  • the invention also provides a wireless power supply system with adaptive adjustment function, which can automatically adjust the main vibration frequency so that the main vibration frequency is always close to the resonance frequency of the power transmitting unit and the power receiving unit coil, so that the system maintains stable power. Output, to achieve relative stability of the system.
  • the present invention provides an adaptive adjustment method for a wireless power supply system, the wireless power supply system including a power transmission unit including a power supply, an oscillating circuit, a control circuit, and a transmitting coil, the oscillating circuit generating a frequency signal of a main vibration frequency, the transmitting coil and a receiving coil of a power receiving unit inductively generate electric energy
  • the adaptive adjusting method includes: detecting a working condition of the power transmitting unit, and determining the power according to the detected operating condition Whether the transmitting unit meets the normal working condition of the wireless power supply system; and determining whether to adjust the main vibration frequency of the oscillating circuit according to the above judgment result such that the main vibration frequency of the oscillating circuit is located between the transmitting coil and the resonant frequency of the receiving coil.
  • the step of detecting the operating condition of the power transmitting unit and determining whether the power transmitting unit meets the normal working condition of the wireless power feeding system according to the detected operating condition comprises: Step A: detecting a current current in the transmitting coil Step B: Determine whether the current current in the transmitting coil is within the normal operating current range of the transmitting coil when the wireless power supply system is in normal operation.
  • the step of determining whether to adjust the main oscillation frequency of the oscillating circuit such that the main oscillating frequency of the oscillating circuit is between the resonant frequency of the transmitting coil and the receiving coil according to the above judgment result comprises: Step C: according to the above step B
  • the result of the determination determines whether to adjust the main oscillation frequency of an oscillating circuit such that the current current in the transmitting coil is within its normal operating current range.
  • the normal operating current range of the transmitting coil is between an allowable minimum current value and an allowable maximum current value.
  • the step ⁇ includes: Step B1: determining whether the current current in the transmitting coil is greater than the allowable minimum current value in the normal operating current range and less than the allowable maximum current value; and step ⁇ 2: when the foregoing judgment result is If yes, it is determined that the current current in the transmitting coil is within its normal operating current range; otherwise, it is determined that the current current in the transmitting coil is not within its normal operating current range.
  • step C if the main oscillation frequency of the oscillating circuit needs to be adjusted so that the current current in the transmitting coil is within its normal operating current range, the step further includes: Step C1: making the oscillating circuit The main vibration frequency is increased by a fixed frequency variable; Step C2: detecting the current in the transmitting coil at this time, and using the current as a positive adjustment current; Step C3: determining whether the positive adjustment current is greater than the adjustment of the main oscillation frequency The current current in the transmitting coil; and step C4: when the above judgment result is YES, the positive current is used as the current current in the transmitting coil, and the step ⁇ is returned; otherwise, the oscillation circuit is made at this time.
  • the main vibration frequency is reduced by two of the fixed frequency variables, the current in the transmitting coil is detected at this time, and the current is used as a negative adjustment current, and the negative adjustment current is used as the current current in the transmitting coil, and the returning step Hey.
  • the method further includes: Step D1: determining whether the current current in the transmitting coil exceeds the allowable maximum current value of the normal operating current range of the transmitting coil; and step D2: when the foregoing determination result is At the time, a warning is issued or the wireless power supply system is automatically turned off; otherwise, the step ⁇ is performed.
  • the present invention also provides an adaptive adjustment method for a wireless power supply system, the wireless power supply system including a power transmitting unit and a power receiving unit, the power transmitting unit including an oscillating circuit and a transmitting coil, the oscillating circuit generating a frequency having a main oscillating frequency a signal, the power receiving unit includes a receiving coil, and the transmitting coil and the receiving coil induce an electric energy.
  • the adaptive adjusting method includes: Step ⁇ : detecting a working condition change value of the power transmitting unit; and Step F: according to the power transmitting unit
  • the change value of the operating condition controls the adjustment of the main vibration frequency so that the main vibration frequency is always close to the resonant frequency of the changed power transmitting unit and the receiving unit coil, so that the system maintains a stable power output.
  • the present invention further provides a wireless power supply system having an adaptive adjustment function, including: a power transmitting unit and a power receiving unit.
  • the power transmitting unit includes a power supply, an oscillating circuit, a control circuit, and a transmitting coil.
  • the oscillating circuit is configured to generate a frequency signal having a main oscillating frequency;
  • the control circuit is electrically connected to the oscillating circuit to adjust the main damper circuit And the transmitting coil generates an oscillating frequency to emit electric energy according to the main vibration frequency of the oscillating circuit.
  • the power receiving unit is configured to receive the electrical energy emitted by the power transmitting unit.
  • the control circuit includes a current detecting circuit, a determining circuit and a processor.
  • the current detecting circuit is configured to detect a current current in the transmitting coil; the determining circuit is configured to determine whether the current current in the transmitting coil is within a normal operating current range of the transmitting coil when the wireless power supply system is working normally;
  • the processor is electrically connected to the determining circuit and the oscillating circuit to determine whether to adjust the main vibration frequency of the oscillating circuit according to the determination result so that the current current in the transmitting coil is within a normal operating current range thereof.
  • the adaptive adjustment method of the wireless power supply system and the wireless power supply system with adaptive adjustment function of the invention can automatically adjust the main vibration frequency, so that the main vibration frequency is always close to the resonance frequency of the transmitting coil and the receiving coil, so that the system maintains stable stability.
  • the power output ensures that the wireless power supply system can work normally and stably.
  • FIG. 1 is a schematic diagram of a conventional wireless power supply system.
  • FIG. 2 is a schematic diagram of a wireless power supply system with adaptive adjustment function according to an embodiment of the invention.
  • FIG. 3 is a schematic diagram of an adaptive adjustment method of a wireless power supply system according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a wireless power supply system with an adaptive adjustment function according to an embodiment of the invention.
  • the wireless power supply system 200 is similar to the wireless power supply system 100 shown in FIG. 1, and includes a power transmitting unit 210 and a power receiving unit 220, wherein the power transmitting unit 210 includes a power supply 211, a control circuit 212, and an oscillation.
  • the circuit 213 and the transmitting coil 214; and the power receiving unit 220 includes a receiving coil 221 and a rectifying and filtering circuit 222.
  • the above electronic components are similar to the electronic components shown in FIG. 1, and will not be described again.
  • control circuit 212 further includes a current detecting circuit 2021, a determining circuit 2122, and a processor 2123.
  • the current detecting circuit 2121 is electrically connected to the transmitting coil 214 to detect the current current in the transmitting coil 214;
  • the determining circuit 2122 is electrically connected to the current detecting circuit 2121 to determine whether the current current in the transmitting coil 214 is in the normal state of the wireless power supply system 200.
  • the working circuit 2123 is electrically connected to the determining circuit 2122 and the oscillating circuit 213 to determine whether to adjust the main vibration frequency fO of the oscillating circuit 213 according to the above-mentioned determination result so that the main vibration frequency fO is located.
  • the resonant frequency fl of the transmitting coil 214 is between the resonant frequency of the receiving coil 221 and the resonant frequency of the receiving coil 221, so that the output power of the system remains stable.
  • the wireless power supply system 100 with adaptive adjustment function of the present invention uses the current flowing into the transmitting coil 214 to determine whether its resonant frequency fl matches the resonant frequency of the receiving coil 221, and if it does not match, the main of the adjusting oscillating circuit 213 is utilized.
  • the vibration frequency fO is such that the main oscillation frequency fO is located between the resonance frequency fl of the transmitting coil 214 and the resonance frequency of the receiving coil 221, and further adjusts the output power of the transmitting coil 214, and also causes the main oscillation frequency fO and the transmitting coil.
  • the resonant frequencies fl and £2 of the 214 and the receiving coil 221 are kept similar, so that the wireless power supply system 100 maintains a stable power output, enabling stable and normal operation.
  • the resonance frequencies of the two coils are close to each other, and the wireless power supply system 200 can perform normal operation, and power transmission can be stably performed.
  • the normal operating current range of the coil is at the allowable minimum current value Imin and the allowable maximum current value Imax.
  • the resonant frequency at which the coil can stably perform power transmission is between the two critical resonant frequencies corresponding to the allowable minimum current value Imin.
  • the present invention also provides an adaptive adjustment method for a wireless power supply system, which is based on determining the amount of current flowing into the transmitting coil to determine whether the frequency variable needs to be compensated to the oscillating circuit 213.
  • the current flowing into the transmitting coil 214 is maintained in an appropriate range to meet the operational requirements. That is, detecting and determining the operating conditions (current, electric power, etc.) of the power transmitting unit 210, and controlling the adjustment of the main vibration frequency so that the main vibration frequency is always close to the resonant frequency of the coils of the power transmitting unit 210 and the power receiving unit 220 after the change. , to maintain a stable power output.
  • FIG. 3 is a schematic diagram of an adaptive adjustment method of a wireless power supply system according to an embodiment of the invention.
  • the method includes detecting current current II in transmit coil 214 using current sense circuit 2121. Then, the judging circuit 2122 judges whether or not the current current II in the transmitting coil 214 exceeds the allowable maximum current value Imax in the normal operating current range of the transmitting coil. Since the current of the coil should not exceed the maximum allowable current when electromagnetic coupling is performed, once the above judgment result is YES, it indicates that the wireless power supply system 200 is in a dangerous state, and an alarm should be issued or the wireless power supply should be automatically turned off. System 200. When the above judgment result is NO, the judging circuit 2122 continues to judge whether or not the current current II in the transmitting coil 214 is within its normal operating current range.
  • the determining circuit 2122 determines whether the current current II in the transmitting coil 214 is greater than the allowable minimum current value Imin in its normal operating current range; when it is greater than the allowable minimum current value Imin, it represents the current current in the transmitting coil 214. Within its normal operating range, the wireless power supply system 200 can operate stably. On the contrary, when it is judged that the current current II in the transmitting coil 214 is less than the allowable minimum current value Imin, it represents that the current current II is in the abnormal operating current range. At this time, the processor 2123 outputs a control signal to adjust the main of the oscillating circuit 213. The vibration frequency f0, and thus the current current II of the transmitting coil 214, is within its normal operating current range.
  • the main oscillation frequency f0 of the oscillation circuit 213 is increased by a fixed frequency variable Af. Then, the current (positive adjustment current) 12 in the transmitting coil 214 at this time is detected by the current detecting circuit 2121. Further, the judging circuit 2122 determines whether the positive adjustment current 12 at this time is greater than the current current II in the transmitting transmitting coil 214. When the positive current 12 is greater than the current current II, it represents the above-mentioned pair of oscillation circuits The adjustment direction of the main vibration frequency fO of 213 is correct.
  • the positive adjustment current 12 can be used as the current current II of the transmitting coil 214, and then it is determined whether the current current II (ie, the positive adjustment current 12) at this time is at Within the normal operating current range, if not, continue with the adjustment.
  • the adjustment direction of the main oscillation frequency f0 of the oscillation circuit 213 is erroneous, and then the main oscillation frequency fO of the oscillation circuit 213 is reduced by two fixed frequencies.
  • the variable (ie, reverse adjustment 2 ⁇ f) detects the current (negative adjustment current) 13 in the transmitting coil 214 at this time, and uses the negative adjustment current 13 as the current current II of the transmitting coil 214, and then continues to judge this time. Whether the current current II (negative adjustment current 13) is within the normal operating current range, if not, continue to adjust.
  • the present invention can gradually adjust the current current II of the transmitting coil 214 to a normal current range, i.e., between the allowable maximum current value Imax and the allowable minimum power value Imin.
  • the wireless power supply system and the adaptive adjustment method thereof can automatically adjust the main vibration frequency so that the main vibration frequency is always between the resonance frequency fl of the transmitting coil 214 and the resonant frequency of the receiving coil 222.
  • the system maintains a stable power output, ensuring that the wireless power supply system can continue to work normally.
  • the adaptive adjustment method of the wireless power supply system and the wireless power supply system with adaptive adjustment function of the invention can automatically adjust the main vibration frequency, so that the main vibration frequency is always close to the resonance frequency of the transmitting coil and the receiving coil, so that the system maintains stable stability.
  • the power output ensures that the wireless power supply system can work normally and stably.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Dc-Dc Converters (AREA)
  • Inverter Devices (AREA)

Description

无线供电系统及其自适应调整方法 技术领域
本发明涉及一种无线供电技术， 且特别是涉及一种无线供电系统的自适 应调整方法以及相应的无线供电系统。
背景技术
无线技术长期以来仍停留在信息应用领域， 如信号的无线传输， 而其电 力传输特性并未获得应有的发展。 所以人们日常使用的电子装置都必须配置 专用的电源适配器以电连接至交流市电或者配置电池以提供电能至电子装 置。 但是， 现有的电源适配器需要利用电源线与电子装置相互电连接， 而由 于电源线的限制， 使得电子装置在移动时极为不便。 随着科技的发展， 无线 供电技术已经开发出来， 其利用无线方式来传输电能至电子装置。 请参阅图
1 , 其绘示为一种现有的无线供电系统的示意图。 如图 1所示， 现有的无线供 电系统 100包括电力发射单元 110 以及电力接收单元 120, 其中电力发射单 元 110—般包括供电电源 111、控制电路 112、振荡电路 113以及发射线圈 114; 而电力接收单元 120—般包括接收线圈 121 以及整流滤波电路 122。 其中， 电力发射单元中 110的供电电源 111用于将交流市电转换成电力发射单元 110 中的各电路 (例如控制电路 112及振荡电路 113)所需要的直流电压，振荡电路 113用于产生一频率信号， 控制电路 112电连接振荡电路 113以控制振荡电 路 113所产生频率信号的主振频率 fO, 而发射线圈 114依据频率信号的主振 频率 fO而产生一谐振频率 fl从而输出电力。电力接收单元 120中的接收线圈 121与发射线圈 114电磁耦合以接收电力发射单元 110所输出的电力而产生 具有一定谐振频率 G的交流电压， 而整流滤波电路 122用以将此交流电压转 换为直流电压。
但是， 为了使无线供电系统 100能够稳定地进行正常工作， 控制振荡电 路 113所产生频率信号的主振频率 fO, 发射线圈 114的谐振频率 fl及接收线 圈 121的谐振频率 £2三者在理想状态下应该是相等的， 即 f0=fl=f2, 以使发 射线圈 114与接收线圈 121能够进行深度地电磁耦合， 从而在电力接收单元 120 产生电能， 完成无线供电。 但实际上， 由于受到物理特性、 使用环境及 电器元件质量等因素的影响， 发射线圈 114与接收线圈 121的谐振频率 fl与 f2fl、 £2会发生漂移， 使得发射线圈 114与接收线圈 121的谐振频率 fl与 £2 差异比较大、相互不匹配， 无法进行深度地电磁耦合， 因此无线供电系统 100 的输出功率不稳定， 也就无法进行正常工作。
发明内容
本发明提供一种无线供电系统的自适应调整方法， 其能够自动地调整主 振频率， 使主振频率始终与电力发射单元和电力接收单元线圈的谐振频率接 近， 使系统维持稳定的功率输出， 达到系统的相对稳定。
本发明还提供一种具有自适应调整功能的无线供电系统， 其能够自动地 调整主振频率， 使主振频率始终与电力发射单元和电力接收单元线圈的谐振 频率接近， 使系统维持稳定的功率输出， 达到系统的相对稳定。
为达上述优点， 本发明提供一种无线供电系统的自适应调整方法， 该无 线供电系统包括电力发射单元， 该电力发射单元包括供电电源、 振荡电路、 控制电路及发射线圈， 该振荡电路产生具有一主振频率的频率信号， 该发射 线圈与一电力接收单元的接收线圈进行感应产生电能， 该自适应调整方法包 括： 检测该电力发射单元的工况， 并根据检测到的工况判断该电力发射单元 是否符合该无线供电系统正常工作的条件； 及依据上述判断结果决定是否调 整该振荡电路的主振频率以使振荡电路的主振频率位于该发射线圈和该接收 线圈的谐振频率之间。
优选地， 上述检测该电力发射单元的工况， 并根据检测到的工况判断该 电力发射单元是否符合该无线供电系统正常工作的条件的步骤包括： 步骤 A: 检测该发射线圈中的当前电流大小； 步骤 B: 判断该发射线圈中的该当前电 流是否处于该无线供电系统正常工作时该发射线圈的正常工作电流范围内。
优选地， 依据上述判断结果决定是否调整该振荡电路的主振频率以使该 振荡电路的主振频率位于该发射线圈和该接收线圈的谐振频率之间的步骤包 括： 步骤 C: 依据上述步骤 B的判断结果而决定是否调整一振荡电路的主振 频率以使该发射线圈中的该当前电流处于其正常工作电流范围内。 优选地， 该发射线圈的正常工作电流范围介于一允许最小电流值与一允 许最大电流值之间。
优选地， 步骤 Β包括： 步骤 B1 : 判断该发射线圈中的该当前电流是否大 于其正常工作电流范围中的该允许最小电流值并小于该允许最大电流值； 及 步骤 Β2: 当上述判断结果为是时， 则确定该发射线圈中的该当前电流处于其 正常工作电流范围内； 反之， 则确定该发射线圈中的该当前电流非处于其正 常工作电流范围内。
优选地， 在步骤 C中， 若需要调整该振荡电路的该主振频率以使该发射 线圈中的该当前电流处于其正常工作电流范围内， 该步骤进一步包括： 步骤 C1 : 使该振荡电路的该主振频率增大一个固定频率变量； 步骤 C2: 检测此时 该发射线圈中的电流， 并将此电流作为正调整电流； 步骤 C3: 判断该正调整 电流是否大于调整主振频率前的该发射线圈中的该当前电流； 及步骤 C4: 当 上述判断结果为是时， 以该正调整电流作为该发射线圈中的该当前电流， 返 回步骤 Β; 反之， 则使该振荡电路中此时的该主振频率减小两个该固定频率 变量， 检测此时该发射线圈中的电流， 并将此电流作为负调整电流， 并以该 负调整电流作为该发射线圈中的该当前电流， 返回步骤 Β。
优选地， 在执行步骤 Β之前进一步包括： 步骤 D1 : 判断该发射线圈中的 该当前电流是否超过该发射线圈的正常工作电流范围的该允许最大电流值； 及步骤 D2: 当上述判断结果为是时， 则发出警告或者自动关闭该无线供电系 统； 反之， 则执行步骤 Β。
本发明还提供一种无线供电系统的自适应调整方法， 该无线供电系统包 括电力发射单元和电力接收单元，该电力发射单元包括振荡电路及发射线圈 , 该振荡电路产生具有一主振频率的频率信号， 该电力接收单元包括一接收线 圈， 该发射线圈和接收线圈感应产生一电能， 该自适应调整方法包括： 步骤 Ε: 检测电力发射单元的工况变化值； 及步骤 F: 根据电力发射单元的工况的 变化值控制主振频率的调整， 使主振频率始终与变化后的电力发射单元和接 收单元线圈的谐振频率接近， 使系统维持稳定的功率输出。 本发明另提供一 种具有自适应调整功能的无线供电系统包含： 电力发射单元及电力接收单元。 该电力发射单元包括供电电源、 振荡电路、 控制电路及发射线圈。 其中该供 电电源用于将交流市电转换成各电流所需要的直流电压； 该振荡电路用于产 生具有一主振频率的频率信号； 该控制电路电连接至该振荡电路以调整该振 荡电路的该主振频率； 而该发射线圈依据该振荡电路的该主振频率而产生一 振荡频率以发射电能。 该电力接收单元用以接收该电力发射单元所发射的电 能。 其中， 该控制电路包括电流检测电路、 判断电路及处理器。 该电流检测 电路用以检测该发射线圈中的当前电流； 该判断电路用以判断该发射线圈中 的该当前电流是否处于该无线供电系统正常工作时该发射线圈的正常工作电 流范围内； 而该处理器电连接该判断电路及该振荡电路以依据上述判断结果 而决定是否调整该振荡电路的该主振频率以使该发射线圈中的该当前电流处 于其正常工作电流范围内。
本发明的无线供电系统的自适应调整方法及具有自适应调整功能的无线 供电系统， 可以自动调整主振频率， 使主振频率始终与发射线圈与接收线圈 的谐振频率接近， 使系统维持稳定的功率输出， 保证了无线供电系统能够一 直稳定地进行正常的工作。
上述说明仅是本发明技术方案的概述， 为了能够更清楚了解本发明的技 术手段， 而可依照说明书的内容予以实施， 并且为了让本发明的上述和其它 目的、 特征和优点能够更明显易懂， 以下特举实施例， 并配合附图， 详细说 明如下。 附图概述
图 1是一种现有的无线供电系统的示意图。
图 2是本发明一实施例所揭示的具有自适应调整功能的无线供电系统的 示意图。
图 3是本发明一实施例所揭示的无线供电系统的自适应调整方法的示意 图。
本发明的较佳实施方式 以下结合附图及较佳实施例， 对依据本发明提出的立体显示装置的具体实施 方式、 结构、 特征及功效， 详细说明如后。
请参阅图 2 , 其绘示为本发明一实施例所揭示的具有自适应调整功能的 无线供电系统的示意图。 如图 2所示， 无线供电系统 200与图 1所示的无线 供电系统 100相似， 其也包括电力发射单元 210 以及电力接收单元 220, 其 中电力发射单元 210包括供电电源 211、控制电路 212、 振荡电路 213以及发 射线圈 214; 而电力接收单元 220包括接收线圈 221以及整流滤波电路 222。 上述这些电子元件与图 1所示的电子元件相似， 在此不再赘述。
此外， 控制电路 212进一步包括电流检测电路 2121、 判断电路 2122 以 及处理器 2123。 其中， 电流检测电路 2121 电连接至该发射线圈 214以检测 发射线圈 214中的当前电流； 判断电路 2122电连接至该电流检测电路 2121 以判断发射线圈 214中的当前电流是否处于无线供电系统 200正常工作时发 射线圈 214的正常工作电流范围内； 而处理器 2123电连接判断电路 2122及 振荡电路 213以依据上述判断结果而决定是否调整振荡电路 213的主振频率 fO以使该主振频率 fO位于发射线圈 214的谐振频率 fl与接收线圈 221的谐振 频率 £2之间， 使系统的输出功率保持稳定。
本发明的具有自适应调整功能的无线供电系统 100是利用流入发射线圈 214的电流来判断其谐振频率 fl是否匹配接收线圈 221的谐振频率 £2, 如果 不匹配，则利用调整振荡电路 213的主振频率 fO来使该主振频率 fO位于发射 线圈 214的谐振频率 fl和接收线圈 221的谐振频率 £2之间， ， 进而调整发射 线圈 214的输出功率， 同时也使主振频率 fO与发射线圈 214及接收线圈 221 的谐振频率 fl和 £2均保持相近，以使无线供电系统 100维持稳定的功率输出， 能够进行稳定、 正常的工作。
此外， 为了使两个线圈能够进行深度的电磁耦合， 需要定义一允许最小 电流值 Imin和允许最大电流值 Imax。 当线圈上的电流 I大于允许最小电流值 Imin且小于允许最大电流值 Imax时， 两个线圈的谐振频率是相互接近的， 无 线供电系统 200可以进行正常的工作， 可以稳定地进行电力传输。 换句话说， 线圈的正常工作电流范围是处于允许最小电流值 Imin与允许最大电流值 Imax 之间， 线圈能够稳定地进行电力传输的谐振频率是处于允许最小电流值 Imin 所对应的两个临界谐振频率之间。
本发明还提供一种无线供电系统的自适应调整方法， 该方法是依据流入 发射线圈的电流大小， 来判断是否需要向振荡电路 213补偿频率变量。 通过 调整振荡电路 213的主振频率， 以维持流入发射线圈 214的电流在一个适当 的范围， 以满足工作需要。 也即， 检测并判断电力发射单元 210工况（电流、 电功率等） ， 控制主振频率的调整， 使主振频率始终与变化后的电力发射单 元 210和电力接收单元 220的线圈的谐振频率接近， 使系统维持稳定的功率 输出。
详而言之， 请参阅图 3 , 其绘示为本发明一实施例所揭示的无线供电系 统的自适应调整方法的示意图。 如图 3所示， 此方法包括利用电流检测电路 2121检测发射线圈 214中的当前电流 II。 然后， 判断电路 2122判断发射线 圈 214中的当前电流 II是否超过发射线圈正常工作电流范围中的允许最大电 流值 Imax。 由于线圈在进行电磁耦合时其电流不应该超过允许最大电流值， 因此一旦上述判断结果为是时， 则代表无线供电系统 200处于一种危险的状 态中， 此时应当发出警报或者自动关闭无线供电系统 200。 当上述判断结果 为否时， 判断电路 2122继续判断发射线圈 214中的当前电流 II是否是处于 其正常工作电流范围内。
具体地， 判断电路 2122判断发射线圈 214中的当前电流 II是否是大于 其正常工作电流范围中的允许最小电流值 Imin; 当大于允许最小电流值 Imin 时， 即代表发射线圈 214中的当前电流 II处于其正常工作范围内， 无线供电 系统 200可稳定地进行工作。 反之， 当判断发射线圈 214中的当前电流 II小 于允许最小电流值 Imin时， 则代表当前电流 II处于非正常工作电流范围内， 此时， 处理器 2123输出一控制信号以调整振荡电路 213的主振频率 f0, 进而 调整发射线圈 214的当前电流 II处于其正常工作电流范围内。
首先， 使振荡电路 213的主振频率 f0增大一个固定频率变量 Af。 然后， 利用电流检测电路 2121检测此时发射线圈 214中的电流 (正调整电流 )12。再， 利用判断电路 2122判断此时的正调整电流 12是否大于发射发射线圈 214中 的当前电流 II。 当正调整电流 12大于当前电流 II时，则代表上述对振荡电路 213的主振频率 fO的调整方向是正确的， 此时， 可将该正调整电流 12作为发 射线圈 214的当前电流 II ,再继续判断此时的当前电流 II (即正调整电流 12 ) 是否处于正常工作电流范围内， 如果不在， 再继续进行调整。
反之， 当正调整电流 12小于当前电流 II时， 则代表上述对振荡电路 213 的主振频率 fO的调整方向是错误的， 然后将振荡电路 213此时的主振频率 fO 减小两个固定频率变量 (即反向调整 2 \f) , 并检测此时发射线圈 214中 的电流 (负调整电流 )13 , 并将该负调整电流 13作为发射线圈 214的当前电流 II , 然后再继续判断此时的当前电流 II (负调整电流 13 )是否处于正常工作 电流范围内， 如果不在， 再继续进行调整。 依次类推， 本发明就可以逐渐地 地将发射线圈 214的当前电流 II调整至正常的电流范围， 即允许最大电流值 Imax和允许最小电 ¾1值 Imin之间。
综上所述， 本发明的无线供电系统及其自适应调整方法， 可以自动调整 主振频率， 使主振频率始终位于发射线圈 214的谐振频率 fl与接收线圈 222 的谐振频率 £2之间， 使系统维持稳定的功率输出， 保证了无线供电系统能够 一直稳定地进行正常的工作。
以上所述， 仅是本发明的实施例而已， 并非对本发明作任何形式上的限 制， 虽然本发明已以实施例揭露如上， 然而并非用以限定本发明， 任何熟悉 本专业的技术人员， 在不脱离本发明技术方案范围内， 当可利用上述揭示的 技术内容作出些许更动或修饰为等同变化的等效实施例， 但凡是未脱离本发 等同变化与修饰， 均仍属于本发明技术方案的范围内。
工业实用性
本发明的无线供电系统的自适应调整方法及具有自适应调整功能的无线 供电系统， 可以自动调整主振频率， 使主振频率始终与发射线圈与接收线圈 的谐振频率接近， 使系统维持稳定的功率输出， 保证了无线供电系统能够一 直稳定地进行正常的工作。

Claims

权 利 要 求 书
1、一种无线供电系统的自适应调整方法， 该无线供电系统包括电力发射 单元， 该电力发射单元包括供电电源、 振荡电路、 控制电路及发射线圈， 该 振荡电路产生具有一主振频率的频率信号， 该发射线圈与一电力接收单元的 接收线圈进行感应产生电能， 该自适应调整方法包括：
检测该电力发射单元的工况， 并根据检测到的工况判断该电力发射单元 是否符合该无线供电系统正常工作的条件； 及
依据上述判断结果决定是否调整该振荡电路的主振频率以使振荡电路的 主振频率位于该发射线圈和该接收线圈的谐振频率之间。
2、根据权利要求 1所述的无线供电系统的自适应调整方法，其特征在于： 检测该电力发射单元的工况， 并根据检测到的工况判断该电力发射单元是否 符合该无线供电系统正常工作的条件的步骤包括：
步骤 A: 检测该发射线圈中的当前电流大小；
步骤 B: 判断该发射线圈中的该当前电流是否处于该无线供电系统正常 工作时该发射线圈的正常工作电流范围内。
3、根据权利要求 2所述的无线供电系统的自适应调整方法，其特征在于： 依据上述判断结果决定是否调整该振荡电路的主振频率以使该振荡电路的主 振频率位于该发射线圈和该接收线圈的谐振频率之间的步骤包括：
步骤 C: 依据上述步骤 B的判断结果而决定是否调整一振荡电路的主振 频率以使该发射线圈中的该当前电流处于其正常工作电流范围内。
4、根据权利要求 3所述的无线供电系统的自适应调整方法，其特征在于： 该发射线圈的正常工作电流范围介于一允许最小电流值与一允许最大电流值 之间。
5、根据权利要求 3所述的无线供电系统的自适应调整方法，其特征在于： 步骤 B包括：
步骤 B1： 判断该发射线圈中的该当前电流是否大于其正常工作电流范围 中的该允许最小电流值并小于该允许最大电流值； 步骤 B2: 当上述判断结果为是时， 则确定该发射线圈中的该当前电流处 于其正常工作电流范围内； 反之， 则确定该发射线圈中的该当前电流非处于 其正常工作电流范围内。
6、根据权利要求 5所述的无线供电系统的自适应调整方法，其特征在于： 步骤 C中， 若需要调整该振荡电路的该主振频率以使该发射线圈中的该当前 电流处于其正常工作电流范围内， 该步骤进一步包括：
步骤 C1 : 使该振荡电路的该主振频率增大一个固定频率变量；
步骤 C2: 检测此时该发射线圈中的电流， 并将此电流作为正调整电流； 步骤 C3： 判断该正调整电流是否大于调整主振频率前的该发射线圈中的 该当前电 ;
步骤 C4: 当上述判断结果为是时， 以该正调整电流作为该发射线圈中的 该当前电流， 返回步骤 B; 反之， 则使该振荡电路中此时的该主振频率减小 两个该固定频率变量， 检测此时该发射线圈中的电流， 并将此电流作为负调 整电流， 并以该负调整电流作为该发射线圈中的该当前电流， 返回步骤8。
7、根据权利要求 5所述的无线供电系统的自适应调整方法，其特征在于： 在执行步骤 B之前进一步包括：
步骤 D1：判断该发射线圈中的该当前电流是否超过该发射线圈的正常工 作电流范围的该允许最大电流值；
步骤 D2: 当上述判断结果为是时， 则发出警告或者自动关闭该无线供电 系统； 反之， 则执行步骤 B。
8、一种无线供电系统的自适应调整方法， 该无线供电系统包括电力发射 单元和电力接收单元， 该电力发射单元包括振荡电路及发射线圈， 该振荡电 路产生具有一主振频率的频率信号， 该电力接收单元包括一接收线圈， 该发 射线圈和接收线圈感应产生一电能， 该自适应调整方法包括：
步骤 E: 检测电力发射单元的工况变化值； 及
步骤 F: 根据电力发射单元的工况的变化值控制主振频率的调整， 使主 振频率始终与变化后的电力发射单元和接收单元线圈的谐振频率接近。
9、根据权利要求 8所述的无线供电系统的自适应调整方法，其特征在于： 步骤 E包括：
检测该发射线圈中的当前电流大小。
10、 根据权利要求 9所述的无线供电系统的自适应调整方法， 其特征在 于： 该发射线圈的正常工作电流范围介于一允许最小电流值与一允许最大电 流值之间。
11、根据权利要求 10所述的无线供电系统的自适应调整方法， 其特征在 于： 步骤 F包括：
步骤 F1： 判断该发射线圈中的该当前电流是否大于其正常工作电流范围 中的该允许最小电流值并小于该允许最大电流值；
步骤 F2: 当上述判断结果为是时， 则确定该发射线圈中的该当前电流处 于其正常工作电流范围内， 返回步骤 E;
步骤 F3: 反之， 当上述判断结果为否时， 则确定该发射线圈中的该当前 电流处于非正常工作电流范围内， 调整该振荡电路的该主振频率以使该发射 线圈中的该当前电流处于其正常工作电流范围内。
12、根据权利要求 11所述的无线供电系统的自适应调整方法， 其特征在 于： 步骤 F3包括：
步骤 F31： 使该振荡电路的该主振频率增大一个固定频率变量； 步骤 F32: 检测此时该发射线圈中的电流， 并将此电流作为正调整电流； 步骤 F33 : 判断该正调整电流是否大于调整主振频率前的该发射线圈中 的该当前电；克；
步骤 F34: 当上述判断结果为是时， 以该正调整电流作为该发射线圈中 的该当前电流， 返回步骤 E; 反之， 当上述判断结果为否时， 则使该振荡电 路中此时的该主振频率减小两个该固定频率变量， 检测此时该发射线圈中的 电流， 并将此电流作为负调整电流， 并以该负调整电流作为该发射线圈中的 该当前电流， 返回步骤£。
13、根据权利要求 10所述的无线供电系统的自适应调整方法， 其特征在 于： 在执行步骤 F之前进一步包括： 步骤 Gl：判断该发射线圈中的该当前电流是否超过该发射线圈的正常工 作电流范围的该允许最大电流值；
步骤 G2: 当上述判断结果为是时， 则发出警告或者自动关闭该无线供电 系统； 反之， 则执行步骤 E。
14、 一种具有自适应调整功能的无线供电系统， 其包含：
一电力发射单元； 其包括供电电源、 振荡电路、 控制电路及发射线圈， 该振荡电路产生具有一主振频率的频率信号， 发射线圈与一电力接收单元的 接收线圈感应产生电能；
该控制电路检测该电力发射单元的工况， 并根据检测到的工况判断该电 力发射单元是否符合该无线供电系统正常工作的条件；
控制电路依据上述判断结果决定是否调整该振荡电路的主振频率以使该 电力发射单元的工况正常。
15、根据权利要求 14所述的具有自适应调整功能的无线供电系统， 其特 征在于： 该供电电源， 用于将交流市电转换成所需要的直流电压； 该振荡电 路与供电电源及控制电路电性连接， 用于产生一主振频率； 该控制电路电连 接至该振荡电路以调整该振荡电路的该主振频率； 该发射线圈， 依据该振荡 电路的该主振频率而产生一振荡频率以发射电能。
16、根据权利要求 15所述的具有自适应调整功能的无线供电系统， 其特 征在于： 该控制电路包括：
一电流检测电路， 用以检测该发射线圈中的当前电流；
一判断电路， 用以判断该发射线圈中的该当前电流是否处于该无线供电 系统正常工作时该发射线圈的正常工作电流范围内； 以及
一处理器， 电连接该判断电路及该振荡电路以依据上述判断结果而决定 是否调整该振荡电路的该主振频率以使该发射线圈中的该当前电流处于其正 常工作电流范围内。
PCT/CN2010/080170 2010-06-24 2010-12-23 无线供电系统及其自适应调整方法 WO2011160406A1 (zh)

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