WO2012100435A1 - 无线电力传输系统及其控制方法 - Google Patents
无线电力传输系统及其控制方法 Download PDFInfo
- Publication number
- WO2012100435A1 WO2012100435A1 PCT/CN2011/070814 CN2011070814W WO2012100435A1 WO 2012100435 A1 WO2012100435 A1 WO 2012100435A1 CN 2011070814 W CN2011070814 W CN 2011070814W WO 2012100435 A1 WO2012100435 A1 WO 2012100435A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- frequency
- coil
- control
- power transmission
- Prior art date
Links
Classifications
-
- 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
- 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
- H02J50/70—Circuit arrangements or systems for wireless supply or distribution of electric power involving the reduction of electric, magnetic or electromagnetic leakage fields
Definitions
- the invention relates to a wireless power transmission system with good thermal stability and a control method thereof. Background technique
- wireless power transmission technology is becoming more and more widely used, and people's lives will become easier and easier, and will no longer be smashed by various power cords.
- some small electronic devices have begun to be charged by wireless power.
- Electronic devices such as wireless chargers, wireless charging mice, and mobile phones can be automatically charged by a wireless power supply.
- the primary side (transmitting end) and the secondary side (receiving end) are in a deep coupled synchronous working state, and the resonant circuit is used as an output stage. Due to factors such as component parameters and environment, the resonant frequency of the coil will drift. The system does not transmit energy at the frequency point, which reduces the energy transmission efficiency. The energy loss causes the coil and the device to heat up. The parameters of the functional device change due to the environment. And the change, the constant accumulation of such changes will also cause the frequency to drift, thus forming a vicious circle. Eventually it will cause a system failure, which may cause serious damage to the equipment.
- An object of the present invention is to provide a wireless power transmission system with good thermal stability and a control method thereof. Achieve stable temperature rise, improve system transmission efficiency, and reduce system thermal load.
- the technical scheme of the invention is to control the system through software, reduce the frequency and drift problem caused by the parameters of the component itself and the ambient temperature parameter, accurately control the frequency and AC frequency characteristics of the wireless transmission circuit, and reduce the heating problem of the key component. Improve the transmission efficiency of wireless power transmission circuits.
- the method uses software real-time control to adjust the working frequency of the primary coil, so that the system works stably at the frequency point, improves the transmission of active power, reduces the generation of reactive power, thereby improving wireless
- the transmission efficiency of the power supply system at the same time, reduces the heat generation of the coil and the device.
- the method is implemented by an integrated circuit, which simplifies circuit design and improves system security and stability.
- the specific realization path of the object of the invention is: controlling the frequency of the transmitting coil by software, compared with the realization of the hardware circuit, reducing the frequency drift caused by the difference of the parameters of the component itself; adjusting the frequency of the coil according to the real-time phase tracking by software, continuously frequency-to-frequency
- the approximation of the point can make the system work stably at the frequency point, improve the transmission efficiency of the system, and reduce the heat generation problem.
- the software can be used to control the opening and closing of the switch tube in the inverter circuit, so as to avoid the formation of a large current in the system loop at the same time.
- the coil and the device are heated; the energy transmission discontinuity caused by simultaneous opening or closing is avoided.
- the control method of the wireless power transmission system of the present invention includes the following steps:
- the driving circuit turns on or off the switching tube according to P1 and P2, so that alternating voltage is formed at both ends of the coil, and the transmitting coil starts high-frequency oscillation;
- the frequency f signal of the coil is processed through a phase locked loop circuit, and the phase difference signal is fed back to the control circuit;
- the control circuit adjusts the outputs of the control signals P1 and P2 according to the feedback signal
- the wireless power transmission system of the present invention includes a transmitting coil frequency generating portion and a coil frequency phase tracking feedback portion.
- the transmitting coil frequency generating portion is composed of a control circuit, a driving circuit and an inverter circuit;
- the coil frequency phase tracking feedback portion is composed of a frequency detecting and a phase locked loop circuit.
- the transmitting coil frequency generating part, the control circuit is controlled by software to output two completely opposite control signals. After the driving circuit, respectively, the opening and closing of one switching tube are respectively controlled, and the voltages VI and V2 are alternately generated to the transmitting coil, forming a high in the coil. Frequency oscillation, energy transmission.
- the control circuit provides two signals P1 and P2 according to the resonance frequency. Software control can achieve the exact opposite of Pl and P2, and it is more accurate than pure hardware and C circuit. In this way, a standard alternating voltage is formed at both ends of the transmitting coil.
- the coil frequency phase tracking feedback part, the voltages VI and V2 across the transmitting coil are sampled, and the oscillation frequency f in the coil is obtained by the voltage comparison circuit.
- the specific implementation method is: if V1>V2, the voltage comparator outputs a high level, and if V V2, the voltage comparator outputs a low level, thereby The oscillation frequency f of the transmitting coil is obtained.
- the oscillating frequency f of the transmitting coil is obtained by the phase comparator and the VCO (Voltage Controlled Oscillator) circuit to obtain f0.
- f0 f due to the action of the phase locked loop.
- f and f0 also generate a phase difference signal ⁇ during the comparison.
- the oscillation frequency f of the transmitting coil and the phase difference signal ⁇ are fed back to the control circuit, and the control circuit compares f0 with the fixed frequency point fk to obtain the value of the frequency drift, and then adjusts the P1 and P2 signals according to the least squares method or the median method.
- the control circuit is used to fine tune the delay time of the output P1, ⁇ 2 signals according to ⁇ .
- phase-locked loop The role of the phase-locked loop is to solve the drift caused by the clock delay in the chip. By connecting the frequency signal to the phase-locked loop so that the phase frequency of the signal is consistent with the reference signal, there will be no data drift.
- a wireless power transmission system with good thermal stability includes a transmitting coil frequency generating circuit and a coil frequency phase tracking feedback circuit, and the transmitting coil frequency generating circuit is composed of a control circuit, a driving circuit and an inverter circuit;
- the tracking feedback circuit consists of a frequency detection and phase-locked loop circuit.
- the control circuit is controlled by software to output two completely opposite control signals, and through the driving circuit, respectively controls the opening and closing of one switching tube, alternately generates voltages VI and V2 for the transmitting coil, and forms a high frequency in the coil. Shock.
- the control circuit provides two signals P1 and ⁇ 2 according to the resonance frequency.
- Software control can achieve the exact opposite of Pl and ⁇ 2, which is more accurate than pure hardware and C circuit. In this way, a standard alternating voltage is formed across the transmitting coil.
- the parameters of the system device are inconsistent, or the system parameters change due to the heat generated by the system, which also causes the frequency to drift.
- the phase tracking circuit is used to solve the problem of frequency drift.
- the switching tubes can be opened or closed at the same time. If the switching tubes in the inverter circuit are turned on at the same time, a large current is formed in the circuit, and the temperature of the device and the coil is increased, and the system is heated. When the switch is turned on or off at the same time, the transmitting coil will not oscillate, so energy transfer cannot be performed.
- the delay of the control signal will be delayed, which will cause the frequency point to drift, and also has the phenomenon of energy transmission interruption.
- the software precisely controls the inverter circuit to maximize the active power of the system and minimize the loss of reactive power, which not only improves the energy transmission efficiency of the system, but also reduces the system heat generation caused by reactive power.
- the invention has the advantages of controlling the frequency of the transmitting coil by software, and reducing the frequency drift caused by the difference of the parameters of the component itself compared with the realization of the hardware circuit;
- the system can be stably operated at the frequency point, which improves the transmission efficiency of the system and reduces the heat generation problem;
- Use CPLD to achieve precise control of the frequency of the wireless transmission circuit, including frequency and timing; use software to control the opening and closing of the switch tube in the inverter circuit, avoiding the simultaneous opening of the system circuit to form a large current, the coil and the device heat; The energy transmission caused by simultaneous opening or closing is discontinuous.
- the frequency of the coil is quickly moved closer to the frequency point, and the work is stably performed
- Figure 1 is a block diagram showing the overall structure of the primary side of the present invention.
- FIG. 2 is a block diagram showing the structure of the control, drive, and inverter sections of the present invention.
- Figure 3 is a diagram showing the standard alternating voltage waveform formed at both ends of the primary side inverter output.
- Figure 4 is an alternating voltage waveform diagram caused by the unsynchronization of the hardware switches.
- Figure 5 is a delayed tail waveform of the device causing the control signal.
- Figure 6 is a block diagram of a coil frequency phase tracking feedback portion of the present invention.
- FIG. 7 is a main flow chart of the control of the present invention. detailed description
- the wireless power transmission system of the present invention includes a transmitting coil frequency generating portion and a coil frequency Phase tracking feedback section.
- the transmitting coil frequency generating portion is composed of a control circuit, a driving circuit and an inverter circuit;
- the coil frequency phase tracking feedback portion is composed of a frequency detecting and a phase locked loop circuit.
- connection structure is:
- the control circuit refers to the microprogram controller (MCU) and its related circuits, the output port is connected to the driver circuit, and the output of the driver circuit is respectively connected with the switching transistor control pole of the inverter circuit to form a software control.
- the control circuit is controlled by software to output two completely opposite control signals. After the driving circuit, it controls the opening and closing of one switching tube respectively, and alternately generates voltages VI and V2 for the transmitting coil, forming high frequency oscillation in the coil, and performing energy. transmission.
- the control circuit provides two signals P1 and P2 according to the resonant frequency. Software control can achieve the exact opposite of Pl and P2, and it is more accurate than pure hardware L and C circuits. In this way, a standard alternating voltage is formed across the transmitting coil.
- the coil frequency phase tracking feedback section includes a frequency voltage sampling and a phase-locked loop circuit.
- the signal output terminal of the phase-locked loop circuit is connected to the control port of the control circuit.
- the coil frequency phase tracking feedback part, the voltages VI and V2 across the transmitting coil are sampled, and the oscillation frequency f in the coil is obtained by the voltage comparison circuit.
- the specific implementation method is: if V1>V2, the voltage comparator outputs a high level, and if V V2, the voltage comparator outputs a low level, thereby obtaining the oscillation frequency f of the transmitting coil.
- the transmitting coil oscillating frequency f is obtained by the phase comparator and the voltage controlled oscillator (VCO) circuit.
- the oscillation frequency f of the transmitting coil and the phase difference signal ⁇ are fed back to the control circuit, and the control circuit compares fO with the fixed frequency point fk to obtain the value of the frequency drift, and then adjusts the P1 and P2 signals according to the least squares method or the median method.
- the control circuit is used to fine tune the delay time of the output P1, ⁇ 2 signals according to ⁇ .
- phase-locked loop The role of the phase-locked loop is to solve the drift caused by the clock delay in the chip. By connecting the frequency signal to the phase-locked loop so that the phase frequency of the signal is consistent with the reference signal, there will be no data drift.
- a wireless power transmission system with good thermal stability includes a transmitting coil frequency generating circuit and a coil frequency phase tracking feedback circuit, and the transmitting coil frequency generating circuit is composed of a control circuit, a driving circuit and an inverter circuit; Phase tracking feedback circuit by frequency detection and The phase-locked loop circuit is composed.
- the control circuit is controlled by software to output two completely opposite control signals, and through the driving circuit, respectively controls the opening and closing of one of the switching tubes to form a high frequency oscillation in the coil.
- the control circuit provides two signals P1 and P2 according to the resonance frequency.
- Software control can achieve the exact opposite of Pl and P2, and it is more accurate than pure hardware L and C circuits.
- a standard alternating voltage is formed across the transmitting coil.
- phase tracking circuit is used to solve the problem of frequency drift.
- the switching tubes can be opened or closed at the same time, see Figure 4. If the switching tubes in the inverter circuit are turned on at the same time, a large current is formed in the circuit, and the temperature of the device and the coil is increased, and the system is heated. When the switch is turned on or off at the same time, the transmitting coil will not oscillate, so energy transfer cannot be performed.
- the delay of the control signal will be delayed, which will cause the frequency drift, and also the energy transmission interruption.
- control method of the wireless power transmission system of the present invention includes the following steps:
- the driving circuit turns on or off the switching tube according to P1 and P2, so that alternating voltage is formed at both ends of the coil, and the transmitting coil starts high-frequency oscillation;
- the control circuit adjusts the outputs of the control signals P1 and P2 according to the feedback signal
- the software precisely controls the inverter circuit to maximize the active power of the system, and minimizes the loss of reactive power, which not only improves the energy transmission efficiency of the system, but also reduces the system heat generation caused by reactive power.
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Inverter Devices (AREA)
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/821,563 US20130300203A1 (en) | 2011-01-30 | 2011-01-30 | Wireless electrical power transmission system and its control method |
PCT/CN2011/070814 WO2012100435A1 (zh) | 2011-01-30 | 2011-01-30 | 无线电力传输系统及其控制方法 |
JP2013550731A JP5650336B2 (ja) | 2011-01-30 | 2011-01-30 | ワイヤレス電力伝送システム及びその制御方法 |
PT11856967T PT2639932T (pt) | 2011-01-30 | 2011-01-30 | Sistema de transmissão de energia elétrica sem fios e seu método de controlo |
CN201180009163.0A CN103688441B (zh) | 2011-01-30 | 2011-01-30 | 无线电力传输系统及其控制方法 |
EP11856967.2A EP2639932B1 (en) | 2011-01-30 | 2011-01-30 | Wireless electrical power transmission system and its control method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CN2011/070814 WO2012100435A1 (zh) | 2011-01-30 | 2011-01-30 | 无线电力传输系统及其控制方法 |
Publications (1)
Publication Number | Publication Date |
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WO2012100435A1 true WO2012100435A1 (zh) | 2012-08-02 |
Family
ID=46580209
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/CN2011/070814 WO2012100435A1 (zh) | 2011-01-30 | 2011-01-30 | 无线电力传输系统及其控制方法 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20130300203A1 (zh) |
EP (1) | EP2639932B1 (zh) |
JP (1) | JP5650336B2 (zh) |
CN (1) | CN103688441B (zh) |
PT (1) | PT2639932T (zh) |
WO (1) | WO2012100435A1 (zh) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR102312096B1 (ko) * | 2015-02-06 | 2021-10-13 | 엘지전자 주식회사 | 무선 전력 전송방법, 무선 전력 전송장치 및 무선 충전 시스템 |
CN104716752B (zh) * | 2015-04-12 | 2017-11-17 | 湖南大学 | 一种感应电能传输控制装置及其控制方法 |
CN107171452B (zh) * | 2017-04-21 | 2020-02-07 | 西安电子科技大学 | 一种射频能量采集电路中的π型阻抗自动匹配系统及方法 |
Citations (1)
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CN1996711A (zh) * | 2006-12-08 | 2007-07-11 | 广州电器科学研究院 | 感应耦合式无线电能传输装置 |
Family Cites Families (11)
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US5450305A (en) * | 1991-08-12 | 1995-09-12 | Auckland Uniservices Limited | Resonant power supplies |
JPH1092673A (ja) * | 1996-07-26 | 1998-04-10 | Tdk Corp | 非接触電力伝送装置 |
JP2004248365A (ja) * | 2003-02-12 | 2004-09-02 | Yazaki Corp | 無接点電力伝送装置、無接点電力伝送方法 |
US7187226B2 (en) * | 2004-07-01 | 2007-03-06 | Analog Devices, Inc. | Anti-cross conduction drive control circuit and method |
US7208912B2 (en) * | 2004-09-24 | 2007-04-24 | Lear Corporation | Inductive battery recharging system with peak voltage detection |
JP2006230028A (ja) * | 2005-02-15 | 2006-08-31 | Meidensha Corp | アクティブフィルタの補償電流制御方式 |
JP4308858B2 (ja) * | 2007-02-16 | 2009-08-05 | セイコーエプソン株式会社 | 送電制御装置、受電制御装置、無接点電力伝送システム、送電装置、受電装置および電子機器 |
US8947041B2 (en) * | 2008-09-02 | 2015-02-03 | Qualcomm Incorporated | Bidirectional wireless power transmission |
JP4620151B2 (ja) * | 2008-12-12 | 2011-01-26 | 東光株式会社 | 非接触電力伝送回路 |
JP4893755B2 (ja) * | 2009-01-14 | 2012-03-07 | セイコーエプソン株式会社 | 送電制御装置、送電装置、電子機器及び負荷状態検出回路 |
JP5369693B2 (ja) * | 2009-01-15 | 2013-12-18 | 日産自動車株式会社 | 非接触給電装置 |
-
2011
- 2011-01-30 US US13/821,563 patent/US20130300203A1/en not_active Abandoned
- 2011-01-30 WO PCT/CN2011/070814 patent/WO2012100435A1/zh active Application Filing
- 2011-01-30 CN CN201180009163.0A patent/CN103688441B/zh active Active
- 2011-01-30 JP JP2013550731A patent/JP5650336B2/ja active Active
- 2011-01-30 EP EP11856967.2A patent/EP2639932B1/en active Active
- 2011-01-30 PT PT11856967T patent/PT2639932T/pt unknown
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1996711A (zh) * | 2006-12-08 | 2007-07-11 | 广州电器科学研究院 | 感应耦合式无线电能传输装置 |
Non-Patent Citations (2)
Title |
---|
FU, WENZHEN ET AL.: "Study on Frequency-tracking Wireless Power Transfer System by Resonant Coupling", THE WORLD OF INVERTERS, August 2009 (2009-08-01), pages 2658 - 2663, XP031485111 * |
See also references of EP2639932A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP2639932B1 (en) | 2018-10-10 |
EP2639932A1 (en) | 2013-09-18 |
US20130300203A1 (en) | 2013-11-14 |
CN103688441B (zh) | 2017-03-22 |
EP2639932A4 (en) | 2016-11-16 |
CN103688441A (zh) | 2014-03-26 |
JP2014506774A (ja) | 2014-03-17 |
JP5650336B2 (ja) | 2015-01-07 |
PT2639932T (pt) | 2019-01-17 |
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