WO2020134992A1 - 基于跟踪功率方式实现频率调节的方法 - Google Patents

基于跟踪功率方式实现频率调节的方法 Download PDF

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Publication number
WO2020134992A1
WO2020134992A1 PCT/CN2019/123917 CN2019123917W WO2020134992A1 WO 2020134992 A1 WO2020134992 A1 WO 2020134992A1 CN 2019123917 W CN2019123917 W CN 2019123917W WO 2020134992 A1 WO2020134992 A1 WO 2020134992A1
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Prior art keywords
frequency
power
wireless charging
value
adjustment
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PCT/CN2019/123917
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English (en)
French (fr)
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浦梦军
陈远明
陈春满
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无锡华润矽科微电子有限公司
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Publication of WO2020134992A1 publication Critical patent/WO2020134992A1/zh

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
    • 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
    • H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
    • 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
    • H02J50/80—Circuit arrangements or systems for wireless supply or distribution of electric power involving the exchange of data, concerning supply or distribution of electric power, between transmitting devices and receiving devices
    • 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
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Definitions

  • the invention relates to the field of energy transmission, in particular to the field of wireless charging, and in particular refers to a method for realizing frequency adjustment based on the tracking power mode.
  • Wireless charging is a technology that uses electromagnetic fields or electromagnetic waves for energy transmission. It is currently widely used in the low-power range, and is mainly used in smart phones, microcomputers, and small portable household appliances.
  • the energy transmission of the transmitting end only needs to be in the range of 87 to 205K, which can be adjusted according to the control error packet at the receiving end, whether it is frequency modulation, voltage regulation, or phase modulation, only It only needs to reach the power required by the receiving end.
  • the 7.5W wireless charging fast charging protocol proposed by other companies.
  • the transmitter needs to reach the 127.7KHz frequency specified by the receiver, and the error range is ⁇ 6 (Hz) to complete the 7.5W energy transmission. If this frequency is not reached, the 7.5W energy cannot be transmitted. .
  • the direct fixed frequency is 127.7KHz, and the adjustment voltage reaches the power of the receiving end.
  • the external hardware structure is increased, but the compatibility is also reduced. If another receiver requires another frequency, there is an incompatibility problem, and the external crystal oscillator cannot avoid the temperature change caused by the transmitter. Change in frequency.
  • the internal reference of the chip will be adjusted when leaving the factory. However, when different schemes are used, changes in hardware and ambient temperature will affect the accuracy of frequency output and there are certain deviations.
  • the fixed frequency (127.7KHz ⁇ ) of the products in mass production is closely related to the PCB layout, capacitance, resistance, temperature and other factors.
  • the purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and to provide a method for realizing frequency adjustment based on the tracking power mode, which avoids the influence of temperature, has strong compatibility and strong adaptability.
  • the method for realizing frequency adjustment based on the tracking power mode of the present invention is as follows:
  • the main feature of the method for realizing frequency adjustment based on tracking power mode is that the method includes the following steps:
  • the wireless charging transmitter runs at the initial frequency preset by the system
  • the wireless charging transmitter performs successive approximation adjustment of the frequency according to the charging power of the receiving terminal acquired in real time, and the successive approximation adjustment is to cyclically perform positive correction according to the frequency error compensation value and the step frequency value calculated successively To adjust and reverse adjustment, until the charging power of the received receiver reaches the required power.
  • the step (2) specifically includes the following steps:
  • the wireless charging transmitting terminal obtains the current charging power of the receiving terminal
  • the wireless charging transmitter judges whether the acquired current charging power of the receiver reaches the required power, and if so, maintains the transmitter at the current frequency state until the wireless charging transmitter ends the wireless charging process; otherwise , Calculate the frequency error compensation value and step frequency value;
  • the wireless charging transmitting end adjusts the current frequency step by step according to the calculated step frequency value, and obtains the current charging power of the receiving end;
  • the wireless charging transmitter determines whether the current charging power of the receiver reaches the required power, and if so, maintains the transmitter at the current frequency until the wireless charging transmitter ends the wireless charging process; otherwise , Calculate the frequency error compensation value and step frequency value;
  • the wireless charging transmitter judges whether the current charging power of the receiver is lower than the previous charging power. If it is, the current frequency is adjusted relative to the previous direction according to the calculated step frequency value. Reverse step adjustment, and the step frequency value of the reverse adjustment is reduced compared to the previous adjustment step frequency value before the reverse adjustment, and continue to step (2.6); otherwise, according to the calculated step frequency Value to the current frequency in the same direction step adjustment relative to the previous adjustment direction, continue to step (2.6);
  • the wireless charging transmitting end obtains the current charging power of the receiving end, and continues to step (2.4).
  • the calculation of the frequency error compensation value and the step frequency value may include the following steps:
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation.
  • the step (1) may also include the following steps:
  • the calculation of the frequency error compensation value and the step frequency value may also include the following steps:
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments
  • F F OP /D IV + ⁇ F+ ⁇ T ⁇ K p ;
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation
  • K p is the frequency error.
  • the step (1) may further include the following steps:
  • the step (2) may also include the following steps:
  • the wireless charging transmitting terminal obtains the current charging power of the receiving terminal
  • the wireless charging transmitter determines whether the current charging power of the receiver reaches the required power, if so, continue to step (2.7a); otherwise, calculate the frequency error compensation value and step in conjunction with the temperature rise Frequency value
  • the wireless charging transmitting end adjusts the current frequency step by step according to the calculated step frequency value, and obtains the current charging power of the receiving end;
  • the wireless charging transmitter determines whether the current charging power of the receiver reaches the required power, if so, continue to step (2.7a); otherwise, calculate the frequency error compensation value and step in conjunction with the temperature rise Frequency value
  • the wireless charging transmitter determines whether the current charging power of the receiving terminal has decreased relative to the previous charging power, and if so, the current frequency is adjusted relative to the previous direction according to the calculated step frequency value Reverse step adjustment, and the step frequency value of the reverse adjustment is reduced compared to the previous adjustment step frequency value before the reverse adjustment, and continue to step (2.6a); otherwise, according to the calculated step
  • the forward frequency value performs the same step adjustment on the current frequency relative to the previous adjustment direction, and continues to step (2.6a);
  • the wireless charging transmitting terminal obtains the current charging power of the receiving terminal, and continues to step (2.4a);
  • step (2.7a) Combine the temperature rise to calculate the frequency error compensation value and the step frequency value, and continue to step (2.2a) until the wireless charging transmitter ends the wireless charging process.
  • the calculation of the frequency error compensation value and the step frequency value in combination with the temperature rise in the step (2.7a) includes the following steps:
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments
  • F F OP /D IV + ⁇ F+ ⁇ T ⁇ K p ;
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation
  • K p is the frequency error.
  • the frequency error K P is calculated by the following formula:
  • Prx is the power value obtained from the receiving end and following a preset protocol.
  • the step frequency value of the reverse step adjustment relative to the previous adjustment direction is smaller than the corresponding step frequency value of the previous step adjustment.
  • the wireless charging transmitting end performs step adjustment on the current frequency and obtains the current charging power of the receiving end with a delay time preset by the system.
  • the initial frequency may be 80KHz ⁇ 300KHz.
  • the initial frequency may be 130KHz.
  • the method of realizing frequency adjustment based on the tracking power mode of the present invention is adopted without increasing the hardware cost, and the algorithm is used to make the transmitting terminal complete the conversion from frequency conversion to fixed frequency, avoid the influence of temperature, and have stronger compatibility.
  • the adaptability is stronger, and the change of the capacitance value and the resistance value will not affect the frequency output accuracy, and the problem of frequency change caused by the externally increased temperature change of the crystal transmitter end is avoided.
  • FIG. 1 is a flowchart of a method for realizing frequency adjustment based on a tracking power mode of the present invention.
  • FIG. 2 is a schematic structural diagram of a method for realizing frequency adjustment based on a tracking power mode of the present invention.
  • FIG. 3 is a flowchart of successive approximation of the method for realizing frequency adjustment based on the tracking power mode of the present invention.
  • the method for realizing frequency adjustment based on the tracking power mode of the present invention includes the following steps:
  • the wireless charging transmitter runs at the initial frequency preset by the system
  • the wireless charging transmitter performs successive approximation adjustment of the frequency according to the charging power of the receiving terminal acquired in real time, and the successive approximation adjustment is to cyclically perform positive correction according to the frequency error compensation value and the step frequency value calculated successively To adjust and reverse adjustment until the received charging power of the receiving end reaches the required power;
  • the wireless charging transmitting terminal obtains the current charging power of the receiving terminal
  • the wireless charging transmitter judges whether the acquired current charging power of the receiver reaches the required power, and if so, maintains the transmitter at the current frequency state until the wireless charging transmitter ends the wireless charging process; otherwise , Calculate the frequency error compensation value and step frequency value;
  • the wireless charging transmitting end adjusts the current frequency step by step according to the calculated step frequency value, and obtains the current charging power of the receiving end;
  • the wireless charging transmitter determines whether the current charging power of the receiver reaches the required power, and if so, maintains the transmitter at the current frequency until the wireless charging transmitter ends the wireless charging process; otherwise , Calculate the frequency error compensation value and step frequency value;
  • the wireless charging transmitter judges whether the current charging power of the receiver is lower than the previous charging power. If it is, the current frequency is adjusted relative to the previous direction according to the calculated step frequency value. Reverse step adjustment, and the step frequency value of the reverse adjustment is reduced compared to the previous adjustment step frequency value before the reverse adjustment, and continue to step (2.6); otherwise, according to the calculated step frequency Value to the current frequency in the same direction step adjustment relative to the previous adjustment direction, continue to step (2.6);
  • the wireless charging transmitting end obtains the current charging power of the receiving end, and continues to step (2.4).
  • the calculation of the frequency error compensation value and the step frequency value may include the following steps:
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation.
  • the step (1) may include the following steps:
  • the calculation of the frequency error compensation value and the step frequency value may include the following steps:
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments
  • F F OP /D IV + ⁇ F+ ⁇ T ⁇ K p ;
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation
  • K p is the frequency error.
  • the step (1) further includes the following steps:
  • the step (2) includes the following steps:
  • the wireless charging transmitting terminal obtains the current charging power of the receiving terminal
  • the wireless charging transmitter determines whether the current charging power of the receiver reaches the required power, if so, continue to step (2.7a); otherwise, calculate the frequency error compensation value and step in conjunction with the temperature rise Frequency value
  • the wireless charging transmitting end adjusts the current frequency step by step according to the calculated step frequency value, and obtains the current charging power of the receiving end;
  • the wireless charging transmitter determines whether the current charging power of the receiver reaches the required power, if so, continue to step (2.7a); otherwise, calculate the frequency error compensation value and step in conjunction with the temperature rise Frequency value
  • the wireless charging transmitter determines whether the current charging power of the receiving terminal has decreased relative to the previous charging power, and if so, the current frequency is adjusted relative to the previous direction according to the calculated step frequency value Reverse step adjustment, and the step frequency value of the reverse adjustment is reduced compared to the previous adjustment step frequency value before the reverse adjustment, and continue to step (2.6a); otherwise, according to the calculated step
  • the forward frequency value performs the same step adjustment on the current frequency relative to the previous adjustment direction, and continues to step (2.6a);
  • the wireless charging transmitting terminal obtains the current charging power of the receiving terminal, and continues to step (2.4a);
  • step (2.7a) Combine the temperature rise to calculate the frequency error compensation value and the step frequency value, and continue to step (2.2a) until the wireless charging transmitter ends the wireless charging process.
  • the calculation of the frequency error compensation value and the step frequency value in combination with the temperature rise in the step (2.7a) includes the following steps:
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments
  • F F OP /D IV + ⁇ F+ ⁇ T ⁇ K p ;
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation
  • K p is the frequency error.
  • the frequency error K P is calculated by the following formula:
  • Prx is the power value obtained from the receiving end and following a preset protocol.
  • the step frequency value of the reverse adjustment relative to the previous adjustment direction is smaller than the step frequency value of the previous adjustment before the reverse adjustment.
  • the wireless charging transmitting end performs step adjustment on the current frequency and obtains the current charging power of the receiving end with a time preset by the system.
  • the initial frequency may be 80KHz to 300KHz.
  • the initial frequency may be 130KHz.
  • the transmitting end is a frequency conversion adjustment structure, which needs to be converted from frequency conversion to a fixed frequency according to the power demand of the receiving end, and conforms to the frequency of the receiving end.
  • Frequency output algorithm F F OP /D IV (F OP reference frequency, D IV division factor), due to temperature, hardware PCB board, chip itself difference, there is an error between the frequency output and the theoretical value, resulting in the maximum output frequency such as 127.7KHz ⁇ 500Hz error.
  • an MCU internal PWM block division generated F i switch MOS transistor, the LC oscillator coupled to the receiving terminal by the decoding module to obtain the receiving end unpacking , Determine the required frequency at the receiving end through the comparison table, try the first initial debugging frequency, and then adjust the frequency through the power continuously returned by the receiving end, through the preset power proportional coefficient, adopt the method of successive approximation, adjust the frequency, and finally reach The fixed frequency required by the receiving end.
  • the method of successive approximation is used to adjust the frequency, and finally reach the fixed frequency required by the receiving end.
  • the method includes the specific operation steps of successively approximating the adjusted frequency by the power returned by the receiving end and the preset power proportional coefficient, as shown in FIG. 3, wherein the specific steps include the following steps:
  • the receiving end judges the frequency 127.7 range
  • the receiving end sends its own power and error value
  • the wireless charging transmitter adjusts the power by adjusting the PWM phase, duty cycle, and dead time;
  • the wireless charging transmitter calculates the frequency error value to be adjusted
  • the wireless charging transmitter adjusts the output PWM frequency, etc.
  • PWM frequency 208M/ (original frequency division coefficient + coefficient to be adjusted).
  • the technical essence and essence of the present invention lies in the frequency adjustment of the wireless charging transmitting terminal.
  • the wireless charging transmitting terminal first operates at the initial frequency, and the corresponding receiving terminal operates at this frequency.
  • the wireless charging transmitting terminal obtains the power information of the receiving terminal. Adjust the frequency to make the receiver run under the charging power required by the system.
  • the fast charging mode is also related to the frequency, but the actual frequency of the receiving end is not equal to the theoretical value of the wireless charging transmitting end because of factors such as devices, lines, and temperature. Therefore, this patent solves the problem of the difference between the theory and the actual.
  • the end obtains the power of the receiving end to judge, and then gradually adjusts the frequency, and loops back and forth until the power is at a high level.
  • the wireless charging transmitter first increases the frequency, and the power also increases accordingly. When a certain frequency is reached, the power drops. At this time, the wireless charging transmitter decreases the frequency, and the adjustment step becomes smaller. When the frequency is adjusted to a certain frequency, the power becomes smaller again, so the wireless charging transmitter increases the frequency again, the adjustment step becomes smaller again, and so on, until the power is the required fast charging power.
  • the receiving end runs at the initial frequency of the sending end.
  • the receiving end has two modes during wireless charging, which are normal mode and fast charging mode. In normal mode, the power is lower, for example, 5W; in fast charging mode, the power is higher, for example, 10W.
  • the receiving end calculates the charging power at the current frequency, and encodes it according to the required target power, for example, dividing the charging power by 128.
  • the wireless charging transmitting end obtains the encoded information of the receiving end and decodes it to obtain the current charging power value and error of the receiving end Value for subsequent frequency adjustments.
  • the wireless charging transmitter operates at the initial frequency preset by the system.
  • the wireless charging transmitter performs the successive approximation adjustment of the frequency according to the charging power of the receiving end obtained in real time.
  • the successive approximation adjustment is to cyclically perform forward adjustment and reverse adjustment according to the frequency error compensation value and the step frequency value calculated successively until The acquired charging power of the receiving end reaches the required power.
  • the wireless charging transmitter first determines whether it is the required power, and if so, continues to maintain the charging power, otherwise, it performs subsequent frequency adjustment.
  • the wireless charging transmitter calculates the frequency error compensation value and the step frequency according to the target power and the current power of the receiver, and adjusts the step frequency according to the calculation result. After delaying the preset time of the system, the current charging power of the receiver is obtained and judged again Whether it is the required power, if it is, continue to maintain the charging power until the sending end of the wireless charging process; otherwise, follow-up frequency adjustment.
  • the wireless charging transmitter again calculates the frequency error compensation value and the step frequency value to determine whether the current charging power of the received receiver has decreased from the previous charging power. If so, the step frequency is adjusted in the opposite direction to the previous adjustment, and the adjustment The step frequency value of is smaller than that of the previous adjustment before the reverse adjustment; otherwise, the step frequency is still adjusted in the same direction as the previous adjustment.
  • the current charging power of the receiving end is obtained, and the cycle is adjusted forward or backward according to the calculation structure until the sending end is maintained at the required power state.
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments.
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation.
  • the wireless charging transmitter runs at the initial frequency preset by the system.
  • the wireless charging transmitter performs the successive approximation adjustment of the frequency according to the charging power of the receiving end obtained in real time.
  • the successive approximation adjustment is to cyclically perform forward adjustment and reverse adjustment according to the frequency error compensation value and the step frequency value calculated successively until The acquired charging power of the receiving end reaches the required power.
  • the wireless charging transmitter first determines whether it is the required power, and if so, continues to maintain the charging power, otherwise, it performs subsequent frequency adjustment.
  • the wireless charging transmitter calculates the frequency error compensation value and the step frequency according to the target power and the current power of the receiver, and adjusts the step frequency according to the calculation result. After delaying the preset time of the system, the current charging power of the receiver is obtained and judged again Whether it is the required power, if it is, continue to maintain the charging power until the sending end of the wireless charging process; otherwise, follow-up frequency adjustment.
  • the wireless charging transmitter again calculates the frequency error compensation value and the step frequency value to determine whether the current charging power of the received receiver has decreased from the previous charging power. If so, the step frequency is adjusted in the opposite direction to the previous adjustment, and the adjustment The step frequency value of is smaller than that of the previous adjustment before the reverse adjustment; otherwise, the step frequency is still adjusted in the same direction as the previous adjustment.
  • the current charging power of the receiving end is obtained, and the cycle is adjusted forward or backward according to the calculation structure until the sending end is maintained at the required power state.
  • the temperature rise ⁇ T needs to be calculated according to the initial temperature and the current temperature of the wireless charging transmitter.
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments.
  • F F OP /D IV + ⁇ F+ ⁇ T ⁇ K p ;
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation
  • K p is the frequency error.
  • the steps of calculating the temperature rise and calculating the temperature control are added to the maintenance process Enter the step of frequency value and repeat the successive approximation cycle until the transmitter maintains the required power state and the temperature remains at the initial temperature state until the wireless charging process is completed.
  • the temperature rise ⁇ T needs to be calculated according to the initial temperature and the current temperature of the wireless charging transmitter.
  • the wireless charging transmitter runs at the initial frequency preset by the system.
  • the wireless charging transmitter performs the successive approximation adjustment of the frequency according to the charging power of the receiving end obtained in real time.
  • the successive approximation adjustment is to cyclically perform forward adjustment and reverse adjustment according to the frequency error compensation value and the step frequency value calculated successively until The acquired charging power of the receiving end reaches the required power.
  • the wireless charging transmitter first determines whether it is the required power, and if so, continues to maintain the charging power, otherwise, it performs subsequent frequency adjustment.
  • the wireless charging transmitter calculates the frequency error compensation value and the step frequency according to the target power and the current power of the receiver, and adjusts the step frequency according to the calculation result. After delaying the preset time of the system, the current charging power of the receiver is obtained and judged again Whether it is the required power, if it is, continue to maintain the charging power until the sending end of the wireless charging process; otherwise, follow-up frequency adjustment.
  • the wireless charging transmitter again calculates the frequency error compensation value and the step frequency value to determine whether the current charging power of the received receiver has decreased from the previous charging power. If so, the step frequency is adjusted in the opposite direction to the previous adjustment, and the adjustment The step frequency value of is smaller than that of the previous adjustment before the reverse adjustment; otherwise, the step frequency is still adjusted in the same direction as the previous adjustment.
  • the current charging power of the receiving end is obtained, and the cycle is adjusted forward or backward according to the calculation structure until the sending end is maintained at the required power state.
  • the temperature rise is calculated, and the step frequency value is calculated according to the calculated temperature rise, and it is judged again whether the current charging power of the received receiver is the required power, and the successive approximation adjustment according to the power Frequency cycle, and each time when the sender reaches the required power, it is necessary to determine whether the temperature rises and adjust, and then realize a large cycle process including maintaining the sender to the required power and maintaining the temperature.
  • e is the cumulative error
  • k is the coefficient
  • p is the charging power
  • i is the number of adjustments.
  • F F OP /D IV + ⁇ F+ ⁇ T ⁇ K p ;
  • F OP is the reference frequency
  • D IV is the frequency division coefficient
  • ⁇ F is the frequency error compensation
  • K p is the frequency error.
  • the method of realizing frequency adjustment based on the tracking power mode of the present invention is adopted without increasing the hardware cost, and the algorithm is used to make the transmitting terminal complete the conversion from frequency conversion to fixed frequency, avoid the influence of temperature, and have stronger compatibility.
  • the adaptability is stronger, and the change of the capacitance value and the resistance value will not affect the frequency output accuracy, and the problem of frequency change caused by the externally increased temperature change of the crystal transmitter end is avoided.

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

本发明涉及一种基于跟踪功率方式实现频率调节的方法，包括步骤：(1)无线充电发送端按系统预设的初始频率运行；(2)所述的无线充电发送端根据实时获取到的充电功率进行频率的逐次逼近调节，所述的逐次逼近调节为按照逐渐计算的频率误差补偿值和步进频率值循环进行调整和相对前次反方向调整，直至所获取到的充电功率达到所需的功率。采用了该基于跟踪功率方式实现频率调节的方法，不增加硬件成本，采用算法使得发射端完成从变频向定频的转变，避免温度带来的影响，兼容性更强，适应性更强，电容值、电阻值变化不会影响频率输出精度。

Description

基于跟踪功率方式实现频率调节的方法
本申请要求于2018年12月29日提交中国专利局、申请号为201811639378.0、发明名称为“基于跟踪功率方式实现频率调节的方法”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及能量传输领域，尤其涉及无线充电领域，具体是指一种基于跟踪功率方式实现频率调节的方法。
背景技术
无线充电是一种利用电磁场或电磁波进行能量传输的一种技术，目前在小功率的范围内应用比较广，主要用于智能手机、微型计算机，小型便携式家用电器等。
根据QI标准协议，在无线充电系统中，发射端的能量传输只需要在87～205K范围内，根据接收端的control error(控制差错)包调节即可，不管是调频，调压，还是调相，只需要达到接收端所需要的功率的即可。但是根据其他公司提出的7.5W无线充快速充电协议。在无线充电系统中，发射端需要达到接收端指定要求的127.7KHz频率，误差范围±6(Hz)才能完成7.5W的能量传输，如果达不到这个频率，就不能以7.5W的能量进行传输。
现行的方案大多数采用外部晶振来控制恒定的输出频率，使用一路PWM波去控制外部DCDC转换器调节电压来达到接收端要求的功率。
在现行的调节频率算法，为了满足某司提出的7.5W快速充电协议，直接固定频率为127.7KHz，调节电压达到接收端的功率。这样的话不仅增加了外部硬件结构，而且兼容性也会降低，若另外一款接收端要求的是另外一种频率就存在无法兼容的问题，外部增加的晶振也无法避免发射端温度变化带来的频率的变化。
芯片内部基准出厂时会进行修调。但是不同方案运用时，硬件、环境温度变化会影响频率输出精度不准确，存在一定的偏差。产品大批量产时固定频率(127.7KHz±)跟PCB版布线，电容、电阻、温度等因素有很大关系。
申请内容
本发明的目的是克服了上述现有技术的缺点，提供了一种避免温度影响、兼容性强、适应性强的基于跟踪功率方式实现频率调节的方法。
为了实现上述目的，本发明的基于跟踪功率方式实现频率调节的方法如下：
该基于跟踪功率方式实现频率调节的方法，其主要特点是，所述的方法包括以下步骤：
(1)无线充电发送端按系统预设的初始频率运行；
(2)所述的无线充电发送端根据实时获取到的接收端的充电功率进行频率的逐次逼近调整，所述的逐次逼近调整为按照逐次计算出的频率误差补偿值和步进频率值循环进行正向调整和反向调整，直至所获取到的接收端的充电功率达到所要求的功率。
较佳地，所述的步骤(2)具体包括以下步骤：
(2.1)所述的无线充电发送端获取接收端当前充电功率；
(2.2)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则维持发送端保持在当前频率状态，直至无线充电发送端结束无线充电过程；否则，计算频率误差补偿值和步进频率值；
(2.3)所述的无线充电发送端根据计算得到的步进频率值对当前频率进行步进调整，并获取接收端当前充电功率；
(2.4)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则维持发送端保持在当前频率状态，直至无线充电发送端结束无线充电过程；否则，计算频率误差补偿值和步进频率值；
(2.5)所述的无线充电发送端判断所获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则根据计算得到的步进频率值对当前频率进行相对前次调整方向的反向步进调整，且进行反向调整的步进频率值相比反向调整前的前次调整的步进频率值减小，并继续步骤(2.6)；否则，根据计算得到的步进频率值对当前频率进行相对前次调整方向的同向步进调整，继续步骤(2.6)；
(2.6)所述的无线充电发送端获取接收端当前充电功率，继续步骤(2.4)。
较佳地，所述的计算频率误差补偿值和步进频率值，可以包括以下步骤：
(a)根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
(b)根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿。
较佳地，所述的步骤(1)中也可以包括以下步骤：
(1.1)所述的无线充电发送端获取初始温度；
所述的计算频率误差补偿值和步进频率值也可以包括以下步骤：
(a)根据所述的初始温度和该无线充电发送端的当前温度计算温升ΔT；
(b)根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
(c)根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF+ΔT×K p；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
较佳地，所述的步骤(1)中还可以包括以下步骤：
(1.1a)所述的无线充电发送端获取初始温度；
所述的步骤(2)还可以包括以下步骤：
(2.1a)所述的无线充电发送端获取接收端当前充电功率；
(2.2a)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则继续步骤(2.7a)；否则，结合温升计算频率误差补偿值和步进频率值；
(2.3a)所述的无线充电发送端根据计算得到的步进频率值对当前频率进行步进调整，并获取接收端当前充电功率；
(2.4a)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则继续步骤(2.7a)；否则，结合温升计算频率误差补偿值和步进频率值；
(2.5a)所述的无线充电发送端判断所获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则根据计算得到的步进频率值对当前频率进行相对前次调整方向的反向步进调整，且进行反向调整的步进频率值相比反向调整前的前次调整的步进频率值减小，并继续步骤(2.6a)；否则，根据计算得到的步进频率值对当前频率进行相对前次调整方向的同向步进调整，继续步骤(2.6a)；
(2.6a)所述的无线充电发送端获取接收端当前充电功率，继续步骤(2.4a)；
(2.7a)结合温升计算频率误差补偿值和步进频率值，继续步骤(2.2a)，直至无线充电发送端结束无线充电过程。
较佳地，所述的步骤(2.7a)中的结合温升计算频率误差补偿值和步进频率值，包括以下步骤：
(a)根据所述的初始温度和该无线充电发送端的当前温度计算温升ΔT；
(b)根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
(c)根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF+ΔT×K p；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
较佳地，所述的频率误差K P，为通过以下公式计算得到：
K P＝10W/Prx；
其中，P rx为从接收端所获取的遵循预设的协议的功率值。
较佳地，所述的相对前次调整方向的反向步进调整的步进频率值，小于所对应的前次步进调整的步进频率值。
较佳地，所述的无线充电发送端对当前频率进行步进调整，与获取接收端当前充电功率之间，延时系统预设的时间。
较佳地，所述的初始频率可以为80KHz～300KHz。
更佳地，所述的初始频率可以为130KHz。
采用了本发明的基于跟踪功率方式实现频率调节的方法，不增加硬件成本，采用算法使得发射端完成从变频向定频的转变，避免温度带来的影响，兼容性更强。适应性更强，电容值、电阻值变化不会影响频率输出精度，避免了外部增加的晶振发射端温度变化带来的频率变化的问题。
附图说明
图1为本发明的基于跟踪功率方式实现频率调节的方法的流程图。
图2为本发明的基于跟踪功率方式实现频率调节的方法的结构示意图。
[根据细则26改正07.01.2020]　
图3为本发明的基于跟踪功率方式实现频率调节的方法的逐次 逼近的流程图。
具体实施方式
为了能够更清楚地描述本发明的技术内容，下面结合具体实施例来进行进一步的描述。
本发明的该基于跟踪功率方式实现频率调节的方法，其中包括以下步骤：
(1)无线充电发送端按系统预设的初始频率运行；
(1.1)所述的无线充电发送端获取初始温度；
(2)所述的无线充电发送端根据实时获取到的接收端的充电功率进行频率的逐次逼近调整，所述的逐次逼近调整为按照逐次计算出的频率误差补偿值和步进频率值循环进行正向调整和反向调整，直至所获取到的接收端的充电功率达到所要求的功率；
(2.1)所述的无线充电发送端获取接收端当前充电功率；
(2.2)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则维持发送端保持在当前频率状态，直至无线充电发送端结束无线充电过程；否则，计算频率误差补偿值和步进频率值；
(2.3)所述的无线充电发送端根据计算得到的步进频率值对当前频率进行步进调整，并获取接收端当前充电功率；
(2.4)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则维持发送端保持在当前频率状态，直至无线充电发送端结束无线充电过程；否则，计算频率误差补偿值和步进频率值；
(2.5)所述的无线充电发送端判断所获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则根据计算得到的步进频率值对当前频率进行相对前次调整方向的反向步进调整，且进行反向调整的步进频率值相比反向调整前的前次调整的步进频率值减小，并继续步骤(2.6)；否则，根据计算得到的步进频率值对当前频率进行相对前次调整方向的同向步进调整，继续步骤(2.6)；
(2.6)所述的无线充电发送端获取接收端当前充电功率，继续步骤(2.4)。
作为本发明的第一种优选实施方式，所述的计算频率误差补偿值和步进频率值，可以包括以下步骤：
(a)根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
(b)根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿。
作为本发明的第二种优选实施方式，所述的步骤(1)中可以包括以下步骤：
(1.1)所述的无线充电发送端获取初始温度；
所述的计算频率误差补偿值和步进频率值可以包括以下步骤：
(a)根据所述的初始温度和该无线充电发送端的当前温度计算温升ΔT；
(b)根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
(c)根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF+ΔT×K p；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
作为本发明的第三种优选实施方式，所述的步骤(1)中还包括以下步骤：
(1.1a)所述的无线充电发送端获取初始温度；
所述的步骤(2)包括以下步骤：
(2.1a)所述的无线充电发送端获取接收端当前充电功率；
(2.2a)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则继续步骤(2.7a)；否则，结合温升计算频率误差补偿值和步进频率值；
(2.3a)所述的无线充电发送端根据计算得到的步进频率值对当前频率进行步进调整，并获取接收端当前充电功率；
(2.4a)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则继续步骤(2.7a)；否则，结合温升计算频率误差补偿值和步进频率值；
(2.5a)所述的无线充电发送端判断所获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则根据计算得到的步进频率值对当前频率进行相对前次调整方向的反向步进调整，且进行反向调整的步进频率值相比反向调整前的前次调整的步进频率值减小，并继续步骤(2.6a)；否则，根据计算得到的步进频率值对当前频率进行相对前次调整方向的同向步进调整，继续步骤(2.6a)；
(2.6a)所述的无线充电发送端获取接收端当前充电功率，继续步骤(2.4a)；
(2.7a)结合温升计算频率误差补偿值和步进频率值，继续步骤(2.2a)，直至无线充电发送端结束无线充电过程。
在本发明的该优选实施方式中，所述的步骤(2.7a)中的结合温升计算频率误差补偿值和步进频率值，包括以下步骤：
(a)根据所述的初始温度和该无线充电发送端的当前温度计算温升ΔT；
(b)根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
(c)根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF+ΔT×K p；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
作为本发明的优选实施方式，所述的频率误差K P，为通过以下公式计算得到：
K P＝10W/Prx；
其中，P rx为从接收端所获取的遵循预设的协议的功率值。
作为本发明的优选实施方式，所述的相对前次调整方向的反向调整的步进频率值相比反向调整前的前次调整的步进频率值减小。
作为本发明的优选实施方式，所述的无线充电发送端对当前频率进行步进调整，与获取接收端当前充电功率之间，延时系统预设的时间。
作为本发明的优选实施方式，所述的初始频率可以为80KHz～300KHz。
作为本发明的进一步优选的实施方式，所述的初始频率可以为130KHz。
本发明的具体实施方式中，主要解决在无线充电系统中，发射端为变频调节架构，需根据接收端功率的需求，由变频达到定频的转变，并符合接收端的频率。在频率精度范围±6Hz内，才能达到更高的能量传输，否则就会以较低的传输功率进行能量传输。频率输出算法F＝F OP/D IV(F OP基准频率，D IV分频系数)，由于温度、硬件PCB板、芯片本身差异，频率输出和理论值存在误差，导致输出频率如127.7KHz存在最大±500Hz误差。
针对现有技术的缺点，在发射端系统不增加晶振的情况下，使用MCU内部PWM模块分频产生的F i开关MOS管，将LC振荡，与接收端耦合，通过解码模块解得接收端的包，通过对照表判断出接收端所需频率，尝试第一次初步调试频率，之后通过接收端不断返回的功率调整频率，通过预设的功率比例系数，采用逐次逼近的 方法，调节频率，最终达到接收端所需的定频。同时兼顾温度带来的影响，通过预设的温度比例系数，采用逐次逼近的方法，调节频率，最终达到接收端所需的定频。
本发明实施例的关键点在于：
频率输出算法：F＝F OP/D IV+(p i－p i－1)×e i×k+ΔT×K p；
其中计算频率误差补偿算法ΔF＝(p i–p i－1)×e i×K；ΔT×K p是本发明实施的关键，e(累计误差)，K，KP系数。
该方法中包含接收端返回的功率和预设的功率比例系数逐次逼近调节频率的具体操作步骤，如图3所示，其中，具体包括以下步骤：
1、系统初始化；
2、于RX建立通讯；
3、判断接收端手机类型；
4、设置PWM频率为130K，用F来标示起始频率(虽然程序设置输出130K频率，但是由于芯片个体差异、PCB板、温度等原因，实际输出会偏差范围(2K))；
5、接收端输出功率；
6、接收端判断频率127.7范围；
7、接收调整输出功率范围；
8、接收端发送本身功率及误差值；
9、无线充电发送端根据接收到的RX的功率值及误差值，通过调整PWM的相位、占空比、死区时间来调整功率；
10、无线充电发送端计算需要调整的频率误差值；
11、无线充电发送端调整输出PWM的频率等。
兼顾温度的情况下逐次逼近调节频率的具体操作步骤如下：
在上述一中第四步骤，增加温度控制：
1、读取当前温度值；
2、每隔1S计算测温度，并计算累计温差；
3、计算调整的PWM分频系数：温差/1度×PWM基准×分频系数；
4、PWM的频率：208M/(原来的分频系数+需要调整的系数)。
本发明的技术本质和精髓思想在于无线充电发送端的频率调节，无线充电发送端首先按初始频率运行，相应的接收端也就按此频率运行，无线充电发送端获得接收端的功率信息，通过对功率的判断进行频率的调整，最终使得接收端运行在系统所要求的充电功率下。
快充模式还与频率有关，但接收端实际的频率因为器件、线路、温度等因素与无线充电发送端的理论值并不相等，故本专利解决的是理论与实际的差异问题，通过无线充电发送端获得接收端的功率进行判断，然后逐步调整频率，循环往复，直到功率处于高位。
比如无线充电发送端先上调频率，功率也随之上调。当到某一频率时，功率下降，此时无线充电发送端下降频率，且调节的步进变小。当调节到某频率，功率再次变小，于是无线充电发送端再次上调频率，调节的步进再次变小，以此类推，直至功率为所需的快充功率。
接收端处跟随发送端的初始频率运行，接收端在无线充电时有两种模式，分别为普通模式和快充模式。普通模式下功率较低，例如功率为5W；快充模式下功率较高，例如功率为10W。接收端计算当前频率下的充电功率，并根据所需的目标功率编码，例如将充电功率除以128，无线充电发送端获取接收端编码后的信息再解码，获取接收端当前充电功率值和误差值进行后续的频率调整。
在本发明的上述第一种实施例的实现方式中，无线充电发送端按系统预设的初始频率运行。无线充电发送端根据实时获取到的接收端的充电功率进行频率的逐次逼近调整，逐次逼近调整即为按照逐次计算出的频率误差补偿值和步进频率值循环进行正向调整和反 向调整，直至所获取到的接收端的充电功率达到所要求的功率。
无线充电发送端先判断是否为所需的功率，如果是，继续维持充电功率，否则，进行后续调整频率。
无线充电发送端根据目标功率和接收端当前功率计算频率误差补偿值和步进频率值，并根据计算结果调整步进频率，延时系统预设的时间后，获取接收端当前充电功率，再次判断是否为所需的功率，如果是，继续维持充电功率，直至发送端结束无线充电过程；否则，进行后续调整频率。
无线充电发送端再次计算频率误差补偿值和步进频率值，判断获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则相对前次调整反方向调整步进频率，且调整的步进频率值比反向调整前的前次调整的步进频率值减小；否则，依然相对前次调整同方向调整步进频率。延时系统预设的时间后，获取接收端当前充电功率，循环根据计算结构正向调整或反向调整，直至维持发送端保持在所需功率状态。
根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数。
根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿。
在本发明所包含的第二种实施例的实现方式中，在无线充电过程中需考虑因为温度导致理论值与实际值产生误差的情况，发送端首次获取接收端的充电功率时需同时获取初始温度，在逐次逼近的计算过程中，计算时需考虑温升的影响，直至维持发送端保持在所需功率状态。
无线充电发送端按系统预设的初始频率运行。无线充电发送端根据实时获取到的接收端的充电功率进行频率的逐次逼近调整，逐 次逼近调整即为按照逐次计算出的频率误差补偿值和步进频率值循环进行正向调整和反向调整，直至所获取到的接收端的充电功率达到所要求的功率。
无线充电发送端先判断是否为所需的功率，如果是，继续维持充电功率，否则，进行后续调整频率。
无线充电发送端根据目标功率和接收端当前功率计算频率误差补偿值和步进频率值，并根据计算结果调整步进频率，延时系统预设的时间后，获取接收端当前充电功率，再次判断是否为所需的功率，如果是，继续维持充电功率，直至发送端结束无线充电过程；否则，进行后续调整频率。
无线充电发送端再次计算频率误差补偿值和步进频率值，判断获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则相对前次调整反方向调整步进频率，且调整的步进频率值比反向调整前的前次调整的步进频率值减小；否则，依然相对前次调整同方向调整步进频率。延时系统预设的时间后，获取接收端当前充电功率，循环根据计算结构正向调整或反向调整，直至维持发送端保持在所需功率状态。
每次计算频率误差补偿值和步进频率值时需先根据初始温度和该无线充电发送端的当前温度计算温升ΔT。
根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数。
根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF+ΔT×K p；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
在本发明所包含的第三种实施例的实现方式中，在无线充电过程中需考虑因为温度导致理论值与实际值产生误差的情况，发送端 首次获取接收端的充电功率时需同时获取初始温度，在逐次逼近的计算过程中，计算时需考虑温升的影响，直至维持发送端保持在所需功率状态。而且，发送端维持保持在所需功率状态的过程中，需考虑后续温度影响的情况，对温度进行控制，故本实施例中，在维持过程中添加了计算温升并计算温度控制时的步进频率值的步骤，并再次进行逐次逼近循环，直至发送端维持保持在所需功率状态且温度保持在初始温度状态，直到结束无线充电过程。
每次计算频率误差补偿值和步进频率值时需先根据初始温度和该无线充电发送端的当前温度计算温升ΔT。
无线充电发送端按系统预设的初始频率运行。无线充电发送端根据实时获取到的接收端的充电功率进行频率的逐次逼近调整，逐次逼近调整即为按照逐次计算出的频率误差补偿值和步进频率值循环进行正向调整和反向调整，直至所获取到的接收端的充电功率达到所要求的功率。
无线充电发送端先判断是否为所需的功率，如果是，继续维持充电功率，否则，进行后续调整频率。
无线充电发送端根据目标功率和接收端当前功率计算频率误差补偿值和步进频率值，并根据计算结果调整步进频率，延时系统预设的时间后，获取接收端当前充电功率，再次判断是否为所需的功率，如果是，继续维持充电功率，直至发送端结束无线充电过程；否则，进行后续调整频率。
无线充电发送端再次计算频率误差补偿值和步进频率值，判断获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则相对前次调整反方向调整步进频率，且调整的步进频率值比反向调整前的前次调整的步进频率值减小；否则，依然相对前次调整同方向调整步进频率。延时系统预设的时间后，获取接收端当前充电功率，循环根据计算结构正向调整或反向调整，直至维持发送端保持在所需功率状态。
发送端维持保持在所需功率状态后，计算温升，并根据计算出 的温升计算步进频率值，再次判断获取的接收端当前充电功率是否为所需的功率，进行根据功率逐次逼近调整频率的循环，且每次发送端到达所需功率后均需判断是否温度上升并调整，进而实现包括发送端维持到所需功率的和维持保持温度的大循环过程。
根据以下公式计算频率误差补偿值ΔF：
ΔF＝(p i–p i－1)×e i×k；
其中，e为累计误差，k为系数，p为充电功率，i为调整次数。
根据以下公式计算步进频率值：
F＝F OP/D IV+ΔF+ΔT×K p；
其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
采用了本发明的基于跟踪功率方式实现频率调节的方法，不增加硬件成本，采用算法使得发射端完成从变频向定频的转变，避免温度带来的影响，兼容性更强。适应性更强，电容值、电阻值变化不会影响频率输出精度，避免了外部增加的晶振发射端温度变化带来的频率变化的问题。
在此说明书中，本发明已参照其特定的实施例作了描述。但是，很显然仍可以作出各种修改和变换而不背离本发明的精神和范围。因此，说明书和附图应被认为是说明性的而非限制性的。

Claims (11)

  1. 一种基于跟踪功率方式实现频率调节的方法，其特征在于，所述的方法包括以下步骤：
    (1)无线充电发送端按系统预设的初始频率运行；
    (2)所述的无线充电发送端根据实时获取到的接收端的充电功率进行频率的逐次逼近调整，所述的逐次逼近调整为按照逐次计算出的频率误差补偿值和步进频率值循环进行正向调整和反向调整，直至所获取到的接收端的充电功率达到所要求的功率。
  2. 根据权利要求1所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的步骤(2)具体包括以下步骤：
    (2.1)所述的无线充电发送端获取接收端当前充电功率；
    (2.2)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则维持发送端保持在当前频率状态，直至无线充电发送端结束无线充电过程；否则，计算频率误差补偿值和步进频率值；
    (2.3)所述的无线充电发送端根据计算得到的步进频率值对当前频率进行步进调整，并获取接收端当前充电功率；
    (2.4)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则维持发送端保持在当前频率状态，直至无线充电发送端结束无线充电过程；否则，计算频率误差补偿值和步进频率值；
    (2.5)所述的无线充电发送端判断所获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则根据计算得到的步进频率值对当前频率进行相对前次调整方向的反向步进调整，并继续步骤(2.6)；否则，根据计算得到的步进频率值对当前频率进行相对前次调整方向的同向步进调整，继续步骤(2.6)；
    (2.6)所述的无线充电发送端获取接收端当前充电功率，继续步骤(2.4)。
  3. 根据权利要求2所述的基于跟踪功率方式实现频率调节的 方法，其特征在于，所述的计算频率误差补偿值和步进频率值，包括以下步骤：
    (a)根据以下公式计算频率误差补偿值ΔF：
    ΔF＝(p i–p i－1)×e i×k；
    其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
    (b)根据以下公式计算步进频率值：
    F＝F OP/D IV+ΔF；
    其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿。
  4. 根据权利要求2所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的步骤(1)中还包括以下步骤：
    (1.1)所述的无线充电发送端获取初始温度；
    所述的计算频率误差补偿值和步进频率值包括以下步骤：
    (a)根据所述的初始温度和该无线充电发送端的当前温度计算温升ΔT；
    (b)根据以下公式计算频率误差补偿值ΔF：
    ΔF＝(p i–p i－1)×e i×k；
    其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
    (c)根据以下公式计算步进频率值：
    F＝F OP/D IV+ΔF+ΔT×K p；
    其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补偿，K p为频率误差。
  5. 根据权利要求1所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的步骤(1)中还包括以下步骤：
    (1.1a)所述的无线充电发送端获取初始温度；
    所述的步骤(2)包括以下步骤：
    (2.1a)所述的无线充电发送端获取接收端当前充电功率；
    (2.2a)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则继续步骤(2.7a)；否则，结合温升计算频率误差补偿值和步进频率值；
    (2.3a)所述的无线充电发送端根据计算得到的步进频率值对当前频率进行步进调整，并获取接收端当前充电功率；
    (2.4a)所述的无线充电发送端判断所获取的接收端当前充电功率是否达到所要求的功率，如果是，则继续步骤(2.7a)；否则，结合温升计算频率误差补偿值和步进频率值；
    (2.5a)所述的无线充电发送端判断所获取的接收端当前充电功率相对前次的充电功率是否下降，如果是，则根据计算得到的步进频率值对当前频率进行相对前次调整方向的反向步进调整，并继续步骤(2.6a)；否则，根据计算得到的步进频率值对当前频率进行相对前次调整方向的同向步进调整，继续步骤(2.6a)；
    (2.6a)所述的无线充电发送端获取接收端当前充电功率，继续步骤(2.4a)；
    (2.7a)结合温升计算频率误差补偿值和步进频率值，继续步骤(2.2a)，直至无线充电发送端结束无线充电过程。
  6. 根据权利要求5所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的步骤(2.7a)中的结合温升计算频率误差补偿值和步进频率值，包括以下步骤：
    (a)根据所述的初始温度和该无线充电发送端的当前温度计算温升ΔT；
    (b)根据以下公式计算频率误差补偿值ΔF：
    ΔF＝(p i–p i－1)×e i×k；
    其中，e为累计误差，k为系数，p为充电功率，i为调整次数；
    (c)根据以下公式计算步进频率值：
    F＝F OP/D IV+ΔF+ΔT×K p；
    其中，F OP为基准频率，D IV为分频系数，ΔF为频率误差补 偿，K p为频率误差。
  7. 根据权利要求4或6所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的频率误差K P，为通过以下公式计算得到：
    K P＝10W/Prx；
    其中，P rx为从接收端所获取的遵循预设的协议的功率值。
  8. 根据权利要求2至6中任一项所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的相对前次调整方向的反向步进调整的步进频率值，小于所对应的前次步进调整的步进频率值。
  9. 根据权利要求2至6中任一项所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的无线充电发送端对当前频率进行步进调整，与获取接收端当前充电功率之间，延时系统预设的时间。
  10. 根据权利要求1、2至6中任一项所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的初始频率为80KHz～300KHz。
  11. 根据权利要求10所述的基于跟踪功率方式实现频率调节的方法，其特征在于，所述的初始频率为130KHz。
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