WO2019100736A1 - 无线充电方法、设备及无线充电系统 - Google Patents
无线充电方法、设备及无线充电系统 Download PDFInfo
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- WO2019100736A1 WO2019100736A1 PCT/CN2018/096160 CN2018096160W WO2019100736A1 WO 2019100736 A1 WO2019100736 A1 WO 2019100736A1 CN 2018096160 W CN2018096160 W CN 2018096160W WO 2019100736 A1 WO2019100736 A1 WO 2019100736A1
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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
- H02J50/10—Circuit arrangements or systems for wireless supply or distribution of electric power using inductive coupling
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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
- 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
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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
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
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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
- 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
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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
- H02J50/90—Circuit arrangements or systems for wireless supply or distribution of electric power involving detection or optimisation of position, e.g. alignment
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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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
- H02J50/40—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices
- H02J50/402—Circuit arrangements or systems for wireless supply or distribution of electric power using two or more transmitting or receiving devices the two or more transmitting or the two or more receiving devices being integrated in the same unit, e.g. power mats with several coils or antennas with several sub-antennas
Definitions
- Embodiments of the present invention relate to the field of electronic technologies, and in particular, to a wireless charging method, device, and wireless charging system.
- wireless charging technology has become more and more widely used in electronic products. Compared with the traditional contact power transmission technology, the wireless energy transmission technology is safer and more convenient because there is no cable connection between the power source and the load.
- the ways to achieve wireless energy transmission mainly include the following methods: electromagnetic radiation type, electromagnetic induction type, electromagnetic resonance type and electric field coupling mode. Based on efficiency and safety considerations, most current wireless energy transmissions use electromagnetic induction and electromagnetic resonance for wireless charging.
- Both electromagnetic induction and electromagnetic resonance wireless charging systems utilize electromagnetic induction between the coils in the transmitter and the coils in the receiver for power transmission.
- the oscillating circuit of the transmitter converts the electrical energy into high frequency alternating current to the primary coil, and the primary coil couples the magnetic energy generated by the high frequency current to the secondary coil at a distance close to the receiver, and the secondary coil receives the electrical energy. And converted to DC power supply load through the conversion circuit.
- the coupling efficiency between the primary coil and the secondary coil is reduced, thereby reducing the charging of the receiver. effectiveness. And the reduced coupling efficiency causes the transmitter to generate a stronger high-frequency current to generate a stronger magnetic field. The stronger magnetic field and lower charging efficiency cause the transmitter and receiver to generate heat.
- Embodiments of the present invention provide a wireless charging method, device, and wireless charging system for improving charging efficiency of a receiver.
- an embodiment of the present application provides a wireless charging system, where the wireless charging system includes a transmitter and a receiver, the transmitter includes a transmitting coil and a first series matching capacitor, the transmitting coil and the first The series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and the second The series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; and the self-inductance value of the transmitting coil when transmitting power to the receiver is Lp, The capacitance value of the first series matching capacitor is Cp; the self-inductance value of the receiving coil when receiving the power transmitted by the first oscillating circuit is Ls, and the capacitance value of the second series matching capacitor is C s ; among them,
- the k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2.
- the wireless charging system can be set to operate at a load-independent point by setting the voltage gain to the voltage-independent point of the load, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter
- the operating frequency and voltage gain for transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load-independent point when the voltage gain between the output voltage of the receiver and the input voltage of the transmitter is a first voltage gain; Composed of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain is independent of an output load of the receiver; the first voltage gain is X, X is satisfied Positive number, or, the X is satisfied Positive number.
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the transmitter further includes a first voltage adjustment module, the first voltage adjustment module being in parallel with the first oscillation circuit; the first voltage adjustment module, configured to adjust the transmitter The input voltage is used to set the voltage gain between the output voltage of the receiver and the input voltage of the transmitter to a first voltage gain.
- the receiver further includes a second voltage regulation module, the second voltage regulation module is in parallel with the second oscillation circuit; and the second voltage regulation module is configured to adjust the receiver An output voltage to set a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to the first voltage gain.
- the wireless charging system operates at a load independent point when the voltage gain between the output voltage of the receiver and the input voltage of the transmitter is a first voltage gain; the wireless charging system includes The transmitter and the receiver, the load-independent point consisting of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain and an output of the receiver Load independent; the first voltage gain is X, and the X is satisfied Positive number, or, the X is satisfied Positive number.
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the transmitter further includes a voltage regulation module, the voltage regulation module being coupled in parallel with the first oscillating circuit; the voltage regulation module for adjusting an input voltage of the transmitter A voltage gain between an output voltage of the receiver and an input voltage of the transmitter is set to the first voltage gain.
- an embodiment of the present application provides a receiver, where the receiver includes a receiving coil and a second series matching capacitor, and the receiving coil and the second series matching capacitor are connected in series to form a second oscillating circuit;
- the second oscillating circuit is configured to receive the power transmitted by the transmitter; the self-inductance value of the receiving coil when receiving the power transmitted by the transmitter is L s , and the capacitance value of the second series matching capacitor is C s ;
- the L p is a self-inductance value of the transmitting coil in the transmitter when transmitting power to the receiver, the Cp being a capacitance value of the first series matching capacitor in the transmitter, and the k is 0.8 ⁇ k a positive number ⁇ 1.2;
- the transmit coil and the first series matching capacitor are connected in series to form a first oscillating circuit; the first oscillating circuit is configured to transfer power to the second oscillating circuit.
- the wireless charging system can be set to operate at a load-independent point by setting the voltage gain to the voltage-independent point of the load, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter
- the operating frequency and voltage gain for transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load independent point when the voltage gain between the output voltage of the receiver and the input voltage of the transmitter is a first voltage gain; the wireless charging system includes The transmitter and the receiver, the load-independent point consisting of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain and an output of the receiver Load independent; the first voltage gain is X, and the X is satisfied Positive number, or, the X is satisfied Positive number.
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the receiver further includes a voltage adjustment module, the voltage adjustment module being in parallel with the second oscillation circuit; the voltage adjustment module, configured to adjust the output voltage of the receiver A voltage gain between an output voltage of the receiver and an input voltage of the transmitter is set to the first voltage gain.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, where the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; and the self-inductance of the transmitting coil when transmitting power to the receiver a value of Lp, a capacitance value of the first series matching capacitor is Cp; a self-inductance value of the receiving coil when receiving power transmitted by the first oscillation circuit is Ls, and a capacitance value of the second series matching capacitor For C s ; of which, The k is a positive number satisfying 0.8 ⁇ k
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the transmitter sets a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method comprising: the transmitter receiving the receiver to transmit Information indicating a first output voltage, the first output voltage being a desired output voltage of the receiver; the transmitter inputting the transmitter according to the first output voltage and the first voltage gain The voltage is set to the first input voltage.
- the method before the transmitter sets a voltage gain between the output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method further includes: the transmitter receiving information indicating the C s and / or indicate the L s is sent by the receiver, the L s C s and the transmitter for determining the gain of the first voltage; and / or And the transmitter receives information sent by the receiver indicating the first voltage gain.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, where the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; and the self-inductance of the transmitting coil when transmitting power to the receiver a value of L p , a capacitance value of the first series matching capacitor is C p ; a self-inductance value of the receiving coil when receiving power transmitted by the first oscillation circuit is L s , and the second series matching capacitor The capacitance value is C s ; The k is a positive number satisfying 0.8 ⁇ k
- the wireless charging system when the voltage gain between the output voltage of the receiver and the input voltage of the transmitter is the first voltage gain, the wireless charging system operates at a load-independent point; the load-independent point Composed of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain is independent of an output load of the receiver;
- the receiver receives power transmitted by the transmitter at the first voltage gain.
- the voltage gain at the load-independent point is constant , set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, where the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; and the self-inductance of the transmitting coil when transmitting power to the receiver a value of L p , a capacitance value of the first series matching capacitor is C p ; a self-inductance value of the receiving coil when receiving power transmitted by the first oscillation circuit is L s , and the second series matching capacitor The capacitance value is C s ; The k is a positive number satisfying 0.8 ⁇ k
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the wireless charging system operates at a load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the receiver sets a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method comprising: the receiver receiving the transmitter to transmit Information indicating a first input voltage, the first input voltage being an input voltage of the transmitter; the receiver setting an output voltage of the receiver to be based on the first input voltage and a first voltage gain The first output voltage.
- the method before the receiver sets a voltage gain between the output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method further includes: the receiver receiving said information indicating said C p and / or L p indicative of the transmitter transmitting information, the L p and said C p for determining the receiver gain of the first voltage; and / or And the receiver receives information sent by the transmitter indicating the first voltage gain.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, where the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; and the self-inductance of the transmitting coil when transmitting power to the receiver a value of L p , a capacitance value of the first series matching capacitor is C p ; a self-inductance value of the receiving coil when receiving power transmitted by the first oscillation circuit is L s , and the second series matching capacitor The capacitance value is C s ; The k is a positive number satisfying 0.8 ⁇ k
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, where the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; the method includes:
- the transmitter finds, from the first mapping table, that the first coupling degree corresponds to the first load-independent point
- the transmitter receives information indicating that the first load-independent point is sent by the receiver, where the first load-independent point is that the first coupling degree that the receiver finds from the first mapping table corresponds to the first Load-independent point;
- the first load-independent point includes the first voltage gain
- the first degree of coupling is a degree of coupling of a coil in the transmitter and a coil in the receiver
- the first mapping table includes At least one degree of coupling, and a load-independent point corresponding to each of the at least one degree of coupling, the load-independent point being a combination of a voltage gain and an operating frequency; at an operating frequency in a load-independent point corresponding to each coupling degree, The voltage gain in the load-independent point corresponding to the degree of coupling is independent of the output load of the receiver;
- the transmitter sets a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to a first voltage gain
- the transmitter transmits power to the receiver at the first voltage gain.
- the wireless charging system can be set to work at the load-independent point by setting the voltage gain as the voltage gain of the load-independent point, so that the voltage gain and the load impedance of the receiver are It is irrelevant, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved. There is no need to limit the circuit parameters of the transmitter and receiver, which improves the versatility of the transmitter and receiver.
- the transmitter sets a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method comprising: the transmitter receiving the receiver to transmit Information indicating a first output voltage, the first output voltage being a desired output voltage of the receiver; the transmitter inputting the transmitter according to the first output voltage and the first voltage gain The voltage is set to the first input voltage.
- the method before the transmitter sets a voltage gain between the output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method further includes: the transmitter receiving Information sent by the receiver indicating the Cs and/or information indicating the Ls, the Cs and the Ls being used by the transmitter to determine the first voltage gain; and/or the transmitting And receiving information indicating the first voltage gain sent by the receiver.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; the method includes:
- the receiver transmits information indicative of a first output voltage to the transmitter, the first output voltage being a desired output voltage of the receiver; the first output voltage being used by the transmitter according to the first output voltage and a first voltage gain setting an input voltage of the transmitter to a first input voltage; the first voltage gain being included in a first load-independent point at which the first degree of coupling found by the transmitter from the first mapping table corresponds Or the first voltage gain is included in the first load-independent point that the receiver finds from the first mapping table corresponds to the first load-independent point; the first load-independent point is that the receiver carries the indication Sending to the transmitter the information of the first load-independent point;
- the first degree of coupling is a degree of coupling between a transmit coil in the transmitter and a receive coil in the receiver, the first mapping table including at least one degree of coupling, and the at least one degree of coupling respective Corresponding load-independent points, the load-independent point is a combination of a voltage gain and an operating frequency; at a working frequency in a load-independent point corresponding to each coupling degree, a voltage gain in a load-independent point corresponding to the coupling degree Independent of the output load of the receiver;
- the receiver receives power transmitted by the transmitter at the first voltage gain.
- the wireless charging system can be set to work at the load-independent point by setting the voltage gain as the voltage gain of the load-independent point, so that the voltage gain and the load impedance of the receiver are It is irrelevant, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved. There is no need to limit the circuit parameters of the transmitter and receiver, which improves the versatility of the transmitter and receiver.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, where the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil and The first series matching capacitors are connected in series to form a first oscillating circuit for transmitting power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil and The second series matching capacitors are connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; the method includes:
- the receiver finds, from the first mapping table, that the first coupling degree corresponds to the first load-independent point
- the first load-independent point includes the first voltage gain, the first degree of coupling being a degree of coupling of a transmit coil in the transmitter and a receive coil in the receiver;
- the first mapping The table includes at least one degree of coupling, and a load-independent point corresponding to each of the at least one degree of coupling, the load-independent point being a combination of a voltage gain and an operating frequency; an operating frequency in a load-independent point corresponding to each coupling degree Upper, the voltage gain in the load-independent point corresponding to the degree of coupling is independent of the output load of the receiver;
- the receiver sets a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to a first voltage gain
- the receiver receives power transmitted by the transmitter at the first voltage gain.
- the wireless charging system can be set to work at the load-independent point by setting the voltage gain as the voltage gain of the load-independent point, so that the voltage gain and the load impedance of the receiver are It is irrelevant, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved. There is no need to limit the circuit parameters of the transmitter and receiver, which improves the versatility of the transmitter and receiver.
- the receiver sets a voltage gain between an output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method comprising: the receiver receiving the transmitter to transmit Information indicating a first input voltage, the first input voltage being an input voltage of the transmitter; the receiver setting an output voltage of the receiver to be based on the first input voltage and a first voltage gain The first output voltage.
- the method before the receiver sets a voltage gain between the output voltage of the receiver and an input voltage of the transmitter to a first voltage gain, the method further includes: the receiver receiving said information indicating said C p and / or L p indicative of the transmitter transmitting information, the L p and said C p for determining the receiver gain of the first voltage; and / or And the receiver receives information sent by the transmitter indicating the first voltage gain.
- an embodiment of the present application provides a charging method based on a wireless charging system, where the wireless charging system includes a transmitter and a receiver, the transmitter includes a transmitting coil and a first series matching capacitor, and the transmitting coil And the first series matching capacitor is connected in series to form a first oscillating circuit, the first oscillating circuit is configured to transmit power to the receiver; the receiver includes a receiving coil and a second series matching capacitor, the receiving coil And the second series matching capacitor is connected in series to form a second oscillating circuit; the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit; the method comprises:
- the first degree of coupling is a degree of coupling between a transmit coil in the transmitter and a receive coil in the receiver, the first mapping table including at least one degree of coupling, and the at least one degree of coupling respective Corresponding load-independent points, the load-independent point is a combination of a voltage gain and an operating frequency; at a working frequency in a load-independent point corresponding to each coupling degree, a voltage gain in a load-independent point corresponding to the coupling degree Independent of the output load of the receiver;
- the transmitter transmits power to the receiver at the first voltage gain.
- the wireless charging system can be set to work at the load-independent point by setting the voltage gain as the voltage gain of the load-independent point, so that the voltage gain and the load impedance of the receiver are It is irrelevant, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved. There is no need to limit the circuit parameters of the transmitter and receiver, which improves the versatility of the transmitter and receiver.
- the embodiment of the present application provides a transmitter, where the transmitter includes a module or unit for performing the wireless charging method provided by the fourth aspect or any possible implementation manner of the fourth aspect.
- the embodiment of the present application provides a receiver, where the receiver includes a module or unit for performing the wireless charging method provided by the fifth aspect.
- the embodiment of the present application provides a receiver, where the transmitter includes a module or unit for performing the wireless charging method provided by any of the possible implementations of the sixth aspect or the sixth aspect.
- an embodiment of the present application provides a transmitter, where the transmitter includes a module or unit for performing the wireless charging method provided by the seventh aspect.
- the embodiment of the present application provides a transmitter, where the transmitter includes a module or unit for performing the wireless charging method provided by any of the possible implementations of the eighth aspect or the eighth aspect.
- the embodiment of the present application provides a receiver, where the receiver includes a module or unit for performing the wireless charging method provided by any of the possible implementations of the ninth aspect or the ninth aspect.
- the embodiment of the present application provides a receiver, where the transmitter includes a module or unit for performing the wireless charging method provided by any of the possible implementations of the tenth or tenth aspect.
- the embodiment of the present application provides a transmitter, where the transmitter includes a module or unit for performing the wireless charging method provided by any one of the possible implementations of the eleventh or eleventh aspect.
- the embodiment of the present application provides a transmitter, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data; a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the fourth aspect or the fourth aspect.
- the embodiment of the present application provides a receiver, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data.
- a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the fifth aspect or the fifth aspect.
- the embodiment of the present application provides a receiver, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the sixth aspect or the sixth aspect.
- an embodiment of the present application provides a transmitter, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the seventh aspect or the seventh aspect.
- the embodiment of the present application provides a transmitter, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the eighth aspect or the eighth aspect.
- the embodiment of the present application provides a receiver, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the ninth or ninth aspect.
- the embodiment of the present application provides a receiver, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data a memory for storing instructions; a processor for invoking instructions in the memory, performing the wireless charging method provided by any of the possible implementations of the tenth or tenth aspect.
- the embodiment of the present application provides a transmitter, including: a processor, a memory, a transceiver, and a bus; a processor, a transceiver, and a memory communicate with each other through a bus; and a transceiver for receiving and transmitting data a memory for storing instructions; a processor for invoking instructions in the memory to perform the wireless charging method provided by any one of the possible implementations of the eleventh or eleventh aspect.
- the embodiment of the present application provides a computer readable storage medium, the storage medium comprising instructions, when the instruction is run on a transmitter, causing the transmitter to perform any of the fourth aspect or the fourth aspect A wireless charging method provided by a possible implementation.
- the embodiment of the present application provides a computer readable storage medium, where the storage medium includes an instruction, when the instruction is run on a receiver, causing the receiver to perform any of the fifth aspect or the fifth aspect A wireless charging method provided by a possible implementation.
- the embodiment of the present application provides a computer readable storage medium, where the storage medium includes an instruction, when the instruction is run on a receiver, causing the receiver to perform any one of the sixth aspect or the sixth aspect It is possible to implement the wireless charging method provided.
- the embodiment of the present application provides a computer readable storage medium, the storage medium comprising instructions, when the instruction is run on a transmitter, causing the transmitter to perform any of the seventh aspect or the seventh aspect A wireless charging method provided by a possible implementation.
- the embodiment of the present application provides a computer readable storage medium, where the storage medium includes an instruction, when the instruction is run on a transmitter, causing the transmitter to perform any of the eighth aspect or the eighth aspect A wireless charging method provided by a possible implementation.
- the embodiment of the present application provides a computer readable storage medium, where the storage medium includes an instruction, when the instruction is run on a receiver, causing the receiver to perform any one of the ninth aspect or the ninth aspect A wireless charging method provided by a possible implementation.
- the embodiment of the present application provides a computer readable storage medium, where the storage medium includes an instruction, when the instruction is run on a receiver, causing the receiver to perform any of the tenth or tenth aspect
- a wireless charging method provided by a possible implementation.
- the embodiment of the present application provides a computer readable storage medium, the storage medium comprising instructions, when the instruction is run on a transmitter, causing the transmitter to perform the eleventh or eleventh aspect
- a wireless charging method provided by any of the possible implementations.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a transmitter, causing the transmitter to perform any of the fourth aspect or the fourth aspect
- the wireless charging method provided by the method.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a receiver, causing the receiver to perform the wireless charging method provided by the fifth aspect.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a receiver, causing the receiver to perform any of the possible implementations of the sixth aspect or the sixth aspect
- the wireless charging method provided by the method.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a transmitter, to enable the transmitter to perform any of the seventh aspect or the seventh aspect
- the wireless charging method provided by the method.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a transmitter, causing the transmitter to perform any of the possible implementations of the eighth aspect or the eighth aspect
- the wireless charging method provided.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a receiver, causing the receiver to perform the wireless charging method provided by the ninth aspect.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a receiver, causing the receiver to perform any one of the tenth or tenth aspects
- the wireless charging method provided by the method.
- the embodiment of the present application provides a computer program, the computer program comprising instructions, when the instruction is run on a transmitter, causing the transmitter to perform any one of the eleventh or eleventh aspects It is possible to implement the wireless charging method provided.
- the embodiment of the present application provides a chip product of a transmitter for performing the method in any of the possible implementations of the fourth aspect or the fourth aspect.
- the embodiment of the present application provides a chip product of a receiver, for performing the method in any of the possible implementations of the fifth aspect or the fifth aspect.
- the embodiment of the present application provides a chip product of a receiver, for performing the method in any of the possible implementation manners of the sixth aspect or the sixth aspect.
- the embodiment of the present application provides a chip product of a transmitter, for performing the method in any of the possible implementations of the seventh aspect or the seventh aspect.
- the embodiment of the present application provides a chip product of a transmitter, for performing the method in any of the possible implementations of the eighth aspect or the eighth aspect.
- the embodiment of the present application provides a chip product of a receiver, for performing the method in any of the possible implementations of the ninth aspect or the ninth aspect.
- the embodiment of the present application provides a chip product of a receiver, for performing the method in any of the possible implementations of the tenth aspect or the tenth aspect.
- the embodiment of the present application provides a chip product of a transmitter for performing the method in any possible implementation manner of the eleventh or eleventh aspect.
- the wireless charging system can be set to work at a load-independent point by setting a voltage gain to a load-independent point voltage gain, so that the voltage gain is independent of the receiver's load impedance, so that the output load of the receiver is not affected.
- the value of the impedance, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are fixed values. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module in the receiver can be reduced, and the charging efficiency of the receiver can be improved.
- FIG. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the present application.
- FIG. 2 is a schematic diagram of a misalignment between a transmitter and a receiver according to an embodiment of the present application
- 3 is an equivalent circuit model of a wireless charging system according to an embodiment of the present application.
- FIG. 4 is a schematic diagram of relationship between voltage gain and operating frequency according to an embodiment of the present application.
- FIG. 5 is an equivalent circuit model of another wireless charging system according to an embodiment of the present application.
- FIG. 6 is a schematic diagram showing another relationship between voltage gain and operating frequency according to an embodiment of the present application.
- FIG. 7 is a schematic diagram showing the relationship between voltage gain and operating frequency according to an embodiment of the present application.
- FIG. 8 is a schematic structural diagram of another wireless charging system according to an embodiment of the present disclosure.
- FIG. 9 is a schematic flowchart of a wireless charging method according to an embodiment of the present application.
- FIG. 10 is a schematic structural diagram of still another wireless charging system according to an embodiment of the present application.
- FIG. 11 is a schematic flowchart diagram of another wireless charging method according to an embodiment of the present disclosure.
- FIG. 12 is a schematic flowchart diagram of still another wireless charging method according to an embodiment of the present application.
- FIG. 13 is a schematic flowchart diagram of still another wireless charging method according to an embodiment of the present disclosure.
- 16 is a schematic diagram of testing voltage and current provided by an embodiment of the present application.
- FIG. 17 is a schematic structural diagram of a wireless charging system 100 according to an embodiment of the present disclosure.
- FIG. 18 is a schematic structural diagram of another wireless charging system 100 according to an embodiment of the present disclosure.
- FIG. 19 is a schematic structural diagram of still another wireless charging system 100 according to an embodiment of the present disclosure.
- FIG. 20 is a schematic structural diagram of still another wireless charging system 100 according to an embodiment of the present application.
- the embodiment of the present application discloses a wireless charging method and device for improving charging efficiency of a receiver. The details are described below separately.
- FIG. 1 is a schematic structural diagram of a wireless charging system according to an embodiment of the present application.
- the wireless charging system 100 includes a transmitter 10 and a receiver 20.
- Transmitter 10 can transmit power to receiver 20 to effect wireless charging of receiver 20.
- Receiver 20 may be a removable user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, a remote terminal, a user terminal, or a user agent.
- the access terminal may be a cellular telephone, a handheld device with wireless communication capabilities, a computing device or an in-vehicle device, a wearable device, a terminal in a 5G system, or a terminal in a publicly evolved public land mobile network (PLMN). Wait.
- the receiver 20 may be a mobile phone, a tablet, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, and an industrial device.
- VR virtual reality
- AR augmented reality
- Wireless terminal in industrial control wireless terminal in self driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, transportation safety
- the receiver 20 can also be a wirelessly charged electric vehicle, white goods such as a tailless television, a wireless charging soymilk, a wirelessly charged sweeping robot, a multi-rotor drone, and the like.
- the data communication manner between the transmitter 10 and the receiver 20 may be wireless communication, specifically, in-band communication, Bluetooth communication, Zigbee communication, WiFi communication, or the like.
- the transmitter 10 may include: a DC power supply 101, a DC / AC converter module 102, the series matching capacitance (capacitance value C p) 103, the transmit coil 104 and the control module 105.
- the receiver 20 may include a receiving coil 201, a series matching capacitor (capacitance value C s ) 202 , an AC/DC conversion module 203 , a voltage stabilizing module 204 , a load output 205 , a modulation module 206 , and a control module 207 .
- the DC power source 101 is configured to provide charging power
- the DC/AC conversion module 102 is connected to the DC power source 101 for receiving DC power output by the DC power source 101 and converting the received DC power into an AC power output.
- the series matching capacitor (capacitance value C p ) 103 and the transmitting coil 104 are connected to form an oscillating circuit, and the oscillating circuit is connected to the DC/AC conversion module 102 for receiving the AC power output by the DC/AC conversion module 102 and transmitting the AC supply.
- Coil 104 The power of the transmitting coil 104 is transmitted to the receiving coil 201 by the coupling of the transmitting coil 104 and the receiving coil 201.
- the control module 105 may each DC power supply 101, DC / AC converter module 102, the series matching capacitance (capacitance value C p) 103 and a transmission coil 104 connected to each module for interactive control parameter to achieve the control of each module .
- the DC/AC conversion module 102 may be a full-bridge inverter circuit, or may be a half-bridge inverter circuit, or may be another inverter circuit that implements DC conversion to AC, which is not limited in this embodiment of the present application.
- the receiving coil 201 is connected to a series matching capacitor (capacitance value C s ) 202 to constitute an oscillating circuit on the receiver 20 side.
- the receiving coil 201 receives the power transmitted by the transmitting coil 104 through the coil coupling, and is converted into an alternating current by an oscillating circuit.
- the AC/DC conversion module 203 is connected to the oscillation circuit for receiving the AC power output by the oscillation circuit, and rectifying the AC power to obtain an output voltage Vrect.
- the voltage stabilizing module 204 is connected to the AC/DC conversion module 203 for eliminating the fluctuation of the output voltage Vrect of the AC/DC conversion module 203 and outputting a stable voltage V2.
- the load output 205 is connected to the voltage stabilizing module 204 for receiving the power supply voltage V2 output by the voltage stabilizing module 204.
- Modulation module 206 is operative to enable in-band communication with transmitter 10.
- modulation module 206 can employ switched capacitor modulation and/or switching resistance modulation.
- the receiver 20 switches the capacitor C1 and/or the resistor R1 into the receiver circuit or the receiver circuit by changing the on and off of the switches S1 and/or S2, thereby changing the receiving coil 201 in the receiver 20.
- the current or voltage changes the voltage or current of the transmitter 10.
- the transmitter 10 collects a voltage or current, and performs demodulation processing and analysis to obtain a communication signal modulated by the receiver 20.
- the control module 207 can be respectively connected to the receiving coil 201, the series matching capacitor (capacitance value C s ) 202, the AC/DC conversion module 203, the voltage stabilizing module 204, the load output 205, and the modulation module 206 for interactive control with each module. Parameters to achieve control of each module.
- the DC/AC conversion module 102 can be a diode full-bridge rectifier circuit, a switch-tube synchronous rectifier circuit, a half-bridge rectifier circuit, or another rectifier circuit that converts AC to DC. This example does not limit this.
- the modulation capacitor C1 and the modulation resistor R1 are connected to cause fluctuations in the load in the receiver 20 loop. For example, if the receiver 20 experiences load bounce, according to the wireless power consortium (WPC) standard, in order to maintain the receiver output voltage constant, it is necessary to adjust the operating frequency. This process requires the transmission of the regulated operating frequency through in-band communication. parameter.
- in-band communication may affect the output load of the receiver. For example, if it is a capacitive modulation mode, if the AC/DC conversion module 203 is a full-wave rectifier diode bridge, the modulation capacitor C1 is equivalent to The capacitance value is increased at the two rectifier tubes of the rectifier bridge. When the polarity of the current flowing into the rectifier bridge changes, the modulation capacitor C1 will be charged or discharged, which is equivalent to the load disturbance, which has an effect on V1.
- WPC wireless power consortium
- the opening and closing of the modulation capacitor and/or the modulation resistor causes a relatively high amplitude change in V1.
- the V2 outputted after the voltage stabilizing module 204 is a smooth DC voltage, so the voltage portion of V1 exceeding V2 is consumed by the voltage stabilizing module 204, and becomes the power consumption of the voltage stabilizing module 204, thereby increasing the power of the receiver 20. loss.
- the transmitting coil 104 and the receiving coil 201 are not facing each other, and there is a misalignment.
- a load jump will cause the output voltage V1 to fluctuate significantly.
- the in-band communication causes the output voltage V1 to jump, the voltage stabilizing module 204 operates frequently, the power consumption of the voltage stabilizing module 204 increases, and the charging efficiency decreases.
- the present application provides a wireless charging method, which can reduce the fluctuation of the output voltage caused by the load jump and reduce the jump of the output voltage caused by the in-band communication, thereby reducing
- the power loss of the voltage regulator module improves the charging efficiency of the receiver.
- the main inventive principles involved in the present application may include: operating the wireless charging system at a load-independent point by voltage regulation and operating frequency adjustment such that the voltage gain is independent of the magnitude of the load impedance of the receiver, such that regardless of the output load impedance of the receiver,
- the operating frequency and voltage gain at which the transmitter transmits power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the operating frequency at which the transmitter transmits power to the receiver is
- the output load of the transmitter is hopping
- the wireless charging system since the wireless charging system operates at the load-independent point, the jump of the output load does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter.
- X0 The input voltage V in0 of the transmitter does not change, and therefore, the output voltage V out0 of the receiver does not change.
- the voltage fluctuation input to the voltage regulator module is small, thus reducing the power loss of the voltage regulator module and improving the charging efficiency of the receiver.
- the coupling coefficient is used to characterize the degree of tight coupling between the transmit coils in the transmitter 10 and the receive coils in the receiver 20.
- the higher the coupling coefficient the higher the efficiency with which the transmit coils in the transmitter 10 transmit power to the receive coils in the receiver 20.
- the coupling coefficient is related to the offset of both (transmitter 10 and receiver 20), the greater the offset between transmitter 10 and receiver 20, between the transmit coil in transmitter 10 and the receive coil in receiver 20.
- the smaller the coupling the smaller the coupling coefficient. Therefore, when wireless charging is performed, the smaller the offset between the transmitter 10 and the receiver 20, the higher the charging efficiency of the wireless charging system. That is, the coupling coefficient K is determined by the offset between the transmitter 10 and the receiver 20.
- the offset here refers to the positional offset of the transmitting coil in the transmitter 10 and the receiving coil in the receiver 20.
- FIG. 2 is a schematic diagram of a misalignment between a transmitter and a receiver according to an embodiment of the present application.
- the offset s between the transmitter 10 and the receiver 20 can be understood as a positional shift between the center of the transmitting coil 104 in the transmitter 10 and the center of the receiving coil 201 in the receiver 20.
- it may be the horizontal distance between the center of the transmitting coil 104 in the transmitter 10 and the center of the receiving coil 201 in the receiver 20.
- the offset s between the transmitter 10 and the receiver 20 can also be understood as the positional deviation between the center of the target transmitting coil in the transmitter 10 and the center of the receiving coil 201 in the receiver 20.
- the target transmit coil may be one or more transmit coils in the transmitter 10 that are at a minimum distance from the receive coil 201 of the receiver 20.
- Mutual inductance is an abbreviation of mutual inductance, which can be used to characterize the strength of the mutual inductance between the transmitting coil in the transmitter and the receiving coil in the receiver.
- the relationship between the coupling coefficient K and the mutual inductance M is: Where L p and L s are the equivalent inductance of the receiver and the equivalent inductance of the transmitter when performing power transmission, respectively.
- the size of the mutual inductance can also reflect the offset between the transmitter and the receiver.
- Both the coupling coefficient and the mutual inductance can be used to indicate the degree of coupling between the transmitting coil in the transmitter 10 and the receiving coil in the receiver 20.
- parameters can also be newly defined to represent the transmitting coil and the receiver 20 in the transmitter 10.
- the degree of coupling between the receiving coils The embodiment of the present application is described by taking the coupling coefficient K as an example. It can be understood that the embodiment of the present application is not limited to the coupling coefficient to indicate the degree of coupling between the transmitting coil in the transmitter 10 and the receiving coil in the receiver 20, and also It can be expressed as a mutual inductance, or it can be represented by other newly defined parameters.
- the operating frequency refers to the frequency at which the transmitter transmits power to the receiver in a wireless charging system.
- the power transmitted on the coupled coil is different at different operating frequencies, and the operating frequency is In the case, the power transmitted on the coupled coil is the largest.
- the control information may be transmitted to the transmitter by means of in-band communication in the form of an error control packet, and the transmitter adjusts the working frequency of the power transmission of the transmitter according to the control information. thereby adjusting the transmitter equivalent inductance L p of the magnetic field strength of the receiver to achieve a desired output voltage or output power.
- the voltage gain is the ratio of the output voltage of the receiver to the input voltage of the transmitter.
- the output voltage refers to the voltage value obtained by the AC/DC conversion module after rectification at the receiver
- the input voltage refers to the voltage value obtained by the DC/AC conversion module after conversion on the transmitter.
- the load-independent point refers to the point at which the output load impedance change of the receiver does not affect the voltage gain and operating frequency of the wireless charging system in the relationship between the voltage gain and the operating frequency.
- FIG. 3 is an equivalent circuit model of a wireless charging system according to an embodiment of the present application.
- the wireless charging system shown in FIG. 1 can be equivalent to the magnetic coupling structure model of the wireless power supply system shown in FIG.
- the output voltage of the transmitter is U op
- the output current is I op
- the frequency of the output voltage and the output current is f op .
- C p is the series matching capacitance value of the transmitter
- L p is the self-inductance value of the transmitting coil in the transmitter when transmitting power to the receiver
- R p is the input resistance of the transmitter.
- C s is the series matching capacitor value of the receiver
- L s is the power transmitted by the receiving coil in the receiving transmitter in the receiver
- R s is the resistance of the receiver
- i s is the current on the coil of the receiver
- i L and u L are load current and load voltage, respectively.
- K is the coupling coefficient between the coil of the transmitter and the coil of the receiver.
- the series matching capacitor of the transmitter (capacitance value Cp) and the transmitting coil constitute a first oscillating circuit
- the series matching capacitor of the receiver (capacitance value Cs) and the receiving coil constitute a second oscillating circuit
- the first oscillating circuit is used for The two oscillating circuits transfer power.
- the second oscillating circuit is configured to receive the power transmitted by the first oscillating circuit and transmit the power to the AC/DC converting module.
- the series matching capacitor of the transmitter may be referred to as a first series matching capacitor
- the series matching capacitor of the receiver may be referred to as a second series matching capacitor.
- FIG. 4 is a schematic diagram of relationship between voltage gain and operating frequency according to an embodiment of the present application.
- the coupling coefficient K is a fixed value K0
- a set of load impedances Z L corresponding to Z1, Z2, and Z3 is respectively plotted.
- Curves, Z1, Z2 and Z3 are different values. a group corresponding to Z1, Z2 and Z3 The curves intersect at the same point.
- the operating frequency is The voltage gain is X0,( X0) can be called a load-independent point.
- Load-independent points are an inherent feature of wireless charging systems. At the load-independent point, if the operating frequency of the wireless charging system is adjusted to Then the output load impedance ZL of the receiver is any value, and the voltage gain is X0.
- FIG. 5 is an equivalent circuit model of another wireless charging system according to an embodiment of the present application.
- L kp is the primary leakage inductance of the transformer
- L ks is the secondary leakage inductance of the transformer
- L m is the primary excitation inductance of the transformer.
- the load independent point is related to the coupling coefficient.
- the coupling coefficient is constant when the transmitter and receiver placement positions are determined, so the load-independent point is also determined when the relative displacement of the transmitter and the receiver is constant.
- the relationship between the coupling coefficient K and the mutual inductance M is Therefore, the relationship between the mutual inductance M and the load-independent point is similar to the coupling coefficient.
- FIG. 6 is a schematic diagram showing another relationship between voltage gain and operating frequency according to an embodiment of the present application.
- the coupling coefficients K are K0, K1 and K2, respectively, and the corresponding load-independent points are respectively ( X0), ( X1) and ( X2).
- the coupling coefficients K0, K1 and K2 correspond to the transmitter and receiver offsets s0, s1 and s2, respectively, where s0>s1>s2.
- FIG. 7 is a schematic diagram showing still another relationship between voltage gain and operating frequency according to an embodiment of the present application.
- the coupling coefficients K are K0, K1 and K2, respectively, the corresponding load-independent points are respectively ( X0), ( X0) and ( X0). among them,
- the coupling coefficients K0, K1 and K2 correspond to the transmitter and receiver offsets s0, s1 and s2, respectively, where s0>s1>s2.
- Const ⁇ 0 adjust the wireless charging system to work at the load-independent point as follows: Const ⁇ 0, the load-independent point of the voltage gain X and the operating frequency As the coupling coefficient changes.
- the primary magnetizing inductance L m is related to the coupling coefficient, and L m is unknown. Therefore, when Const ⁇ 0, for the wireless charging system, the load-independent point cannot be directly calculated.
- the coupling coefficient, the Const and the load-independent point mapping relationship can be pre-stored to obtain the first mapping table.
- the wireless charging system may first determine the coupling coefficient between the transmitter and the receiver according to the offset between the transmitter and the receiver, and query the first mapping table to obtain a load-independent point under the current coupling coefficient. And adjust the wireless charging system to work at this load-independent point.
- the wireless charging system needs to be set to work at a load-independent point when performing power transmission. It can be set that the voltage gain between the output voltage of the receiver and the input voltage of the transmitter is constant as the voltage gain X0 of the load-independent point, and the operating frequency of the transmitter transmitting power to the receiver is the operating frequency of the load-independent point. In setting the gain to the voltage gain X0 at the load-independent point, it is necessary to adjust the voltage.
- a voltage regulation module may be provided in the transmitter for adjusting the input voltage of the transmitter to set the voltage gain to a voltage gain X0 at a load-independent point.
- a voltage adjustment module in the receiver for adjusting the output voltage in the receiver to set the voltage gain to the voltage gain X0 of the load-independent point, and the operating frequency is adjusted to the operating frequency of the load-independent point by closed-loop frequency conversion.
- the voltage adjustment module may be disposed at the transmitter, or the voltage adjustment module is disposed at the receiver.
- the embodiment of the present application provides a wireless charging system.
- the circuit parameters L p , C p , L s , and C s of the transmitter and the receiver can make the load independent point.
- the voltage gain does not change as the coupling coefficient changes.
- L p , C p , L s and C s can be designed to satisfy: k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2 to ensure that the wireless charging system operates near the load-independent point.
- the embodiment of the present application does not limit the condition that k satisfies 0.8 ⁇ k ⁇ 1.2, for example, 0.7 ⁇ k ⁇ 1.3, and the range may be determined according to the design accuracy requirement of the wireless charging system. Not limited.
- FIG. 8 is a schematic structural diagram of another wireless charging system according to an embodiment of the present application.
- the transmitter 10 may include: a DC power supply 101, a DC / AC converter module 102, the series matching capacitance (capacitance value C p) 103, the transmit coil 104 and the control module 105.
- the receiver 20 may include a receiving coil 201, a series matching capacitor (capacitance value C s ) 202 , an AC/DC conversion module 203 , a voltage stabilizing module 204 , a load output 205 , a modulation module 206 , and a control module 207 .
- a control module 207 For a detailed description of each of the above modules, reference may be made to the wireless charging system architecture described in FIG. 1 , and details are not described herein again.
- a voltage adjustment module 106 is further disposed in the transmitter for adjusting the input voltage of the transmitter to set the voltage gain to the voltage gain X0 of the load-independent point.
- the voltage adjustment module 106 is configured to receive the DC voltage output by the DC power source 101 and receive a control signal output by the control module 105 to adjust the DC voltage to set the voltage gain to a voltage gain X0 of the load-independent point.
- the voltage regulation module 106 can be a DC/DC output voltage adjustable module or a voltage adapter circuit.
- the voltage regulation module 106 is the first voltage regulation module.
- the receiver 20 further includes a battery management system (BMS) 208.
- BMS battery management system
- the receiver 20 is further configured to receive a desired output voltage V_out_target sent by the BMS.
- the desired output voltage has the following two purposes: First, the V_out_target is used for receiver adjustment. The output voltage is the desired output voltage. Secondly, the desired output voltage V_out_target is further used by the transmitter to determine the input voltage of the transmitter as the first input voltage Vin_set according to the desired output voltage and the voltage gain X0 of the load-independent point, and input the voltage through the voltage regulating module in the transmitter. Adjusted to the first input voltage Vin_set. The description will be separately made below.
- the receiver adjusts the output voltage to the desired output voltage V_out_target of the BMS, which is actually a closed loop feedback adjustment process.
- the specific adjustment process is as follows: as shown in FIG. 8, the receiver uses V_out_target as a reference of the voltage stabilization module 204, and adds a preset increment to obtain a preset value of the Vrect, which may be obtained by looking up the table. Used to ensure the relevant chip works normally.
- the receiver obtains the current output voltage Vrect of the rectifier by detecting the potential of the connection point of R1 and R2, obtains an error voltage according to the preset value of Vrect and the detected current Vrect, and transmits the error voltage to the transmitter through in-band communication.
- the transmitter can change the operating frequency of the transmitted power between the transmitter and the receiver.
- the receiver can finally adjust the Vrect to the preset value of Vrect by means of the above feedback error voltage.
- the preset value of Vrect obtained from the desired output voltage is hereinafter referred to as the first output voltage.
- the desired output voltage V_out_target is used by the transmitter to determine the input voltage of the transmitter as the first input voltage Vin_set according to the desired output voltage and the voltage gain X0 of the load-independent point, as follows, based on the wireless charging system described in FIG. Schematic.
- FIG. 9 is a schematic flowchart diagram of a wireless charging method according to an embodiment of the present application.
- the load-independent point of the wireless charging system ( The voltage gain X0 in X0) is the first voltage gain. Regardless of the value of the coupling coefficient, the voltage gain X0 of the load-independent point is the first voltage gain.
- the wireless charging method can include the following steps:
- the receiver sends information indicating a first output voltage to the transmitter.
- the first output voltage is the desired output voltage of the receiver.
- the transmitter sets an input voltage of the transmitter as the first input voltage according to the first output voltage and the first voltage gain.
- the transmitter transmits power to the receiver with a first voltage gain.
- the transmitter transmits power to the receiver with the first voltage gain
- the first voltage gain is the voltage gain of the load-independent point
- the operating frequency at which the transmitter transmits power to the receiver is the first operating frequency
- the transmitter The input voltage is the first input voltage
- the desired output voltage of the receiver is sent by the BMS to the control module 207.
- adjusting the input voltage of the transmitter to the first input voltage is also a closed loop feedback adjustment process.
- the specific process is as follows: the input voltage of the transmitter is gradually adjusted according to the first input voltage. A change in the input voltage of the transmitter causes the output voltage of the receiver to deviate from the first output voltage. Deviation of the receiver output voltage causes the receiver to again initiate a closed loop feedback loop regulation that regulates the output voltage to the first output voltage of the desired output voltage, thereby causing the transmitter to adjust the operating frequency of the power transfer.
- the input voltage of the transmitter is finally the first input voltage, the voltage gain is the voltage gain X0 of the load-independent point, and the operating frequency of the power transmission is the operating frequency falling at the load-independent point.
- the input voltage of the transmitter refers to the output voltage of the voltage adjustment module 106 in the transmitter.
- the output voltage of the receiver refers to the output voltage Vrect of the rectifier module 203 in the receiver.
- the voltage gain X0 of the load-independent point is the first voltage gain.
- the capacitance value C p of the series matching capacitor of the transmitter and the transmitter coil are required to be
- the self-inductance value L p when the power is transmitted to the receiver, the capacitance value C s of the series matching capacitor of the receiver, and the self-inductance value Ls of the receiver coil when receiving the power transmitted by the transmitter are designed to satisfy the above parameters.
- k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2.
- the voltage gain can be increased or decreased by an offset when the load-independent point voltage gain is set.
- the first voltage gain X0 can be satisfied Positive number.
- the voltage gain at the load-independent point is constant Set the voltage gain at Range, or The range is such that the wireless charging system operates near the load-independent point, so that the voltage gain is independent of the receiver's load impedance, so that regardless of the receiver's output load impedance, the transmitter's transmit power to the receiver's operating frequency and voltage gain are both Is a fixed value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the first output voltage can be the desired output voltage of the BMS in the receiver.
- the desired output voltage of the BMS in the receiver may change.
- the desired output voltage of the BMS can be affected by factors such as the amount of power at the receiver. For example, the voltage gain at the load-independent point is 1.1. In the case where the receiver's charge is low (which may be below a certain threshold), the desired output voltage of the BMS in the receiver may be 9.9V.
- the receiver feeds back the difference between the current output voltage and the set output voltage to the transmitter through the closed loop, and the transmitter adjusts the operating frequency when receiving the voltage difference.
- the output voltage of the voltage regulator module in the receiver is adjusted to 9.9V by the above closed loop adjustment process.
- the receiver sends the desired output voltage of the BMS to the transmitter.
- the transmitter calculates the input voltage of the transmitter to be 9V according to the expected output voltage of the BMS of 9.9V and the voltage gain of 1.1. Then, the transmitter gradually adjusts the output voltage of the transmitter through the voltage regulating module, and the input voltage of the transmitter changes to offset the output voltage of the receiver by 9.9V.
- the receiver detects a deviation of 9.9V
- the closed loop is started to the transmitter. The difference between the current output voltage and the set output voltage is fed back, and the transmitter re-adjusts the operating frequency according to the voltage difference.
- the input voltage of the transmitter is 9V
- the output voltage of the receiver is 9.9V
- the voltage gain is 1.1
- the operating frequency also falls on the operating frequency of the load-independent point.
- the expected output voltage of the BMS may be 5.5V.
- the current receiver's output voltage is still 9.9V, the receiver can repeat the above closed loop regulation process, and finally adjust the transmitter's input voltage to 5V, the receiver's output voltage is adjusted to 5.5V, and the voltage gain is 1.1.
- the operating frequency also falls on the operating frequency of the load-independent point.
- the offset between the receiver and the transmitter changes, and the coupling coefficient between the inductor of the transmitter and the inductor of the receiver changes.
- the load-independent point at which the wireless charging system operates is ( X0).
- the coupling coefficient is K1
- the curve changes from 1 to 2, since the operating frequency is still The corresponding voltage gain becomes larger, causing the output voltage to deviate from the desired output voltage of the BMS.
- the receiver can perform the closed loop adjustment process.
- step S104 After the closed loop adjustment is completed, the voltage gain is pulled back to X0, and the corresponding working frequency is The wireless charging system operates at a load-independent point where the coupling coefficient is K1 ( X0).
- the first input voltage is obtained by dividing the first output voltage by the first voltage gain.
- the first voltage gain may be sent by the receiver to the transmitter, and the receiver may be calculated according to C p and C s (or L s and L p ) and sent to the transmitter, and the receiver may also be preset.
- the voltage gain is sent to the transmitter.
- the first voltage may be a receiver gain in accordance with C p and C s (or L s and L p) calculated, the transmitter may receive information indicative of the C s receiver sends advance, or information indicating the L s.
- the C s (L s ) and the first output voltage may be indicated by the same information, or may be indicated by different information, which is not limited in this application.
- the above describes the voltage regulation module is set in the transmitter, the transmitter adjusts the input voltage to adjust the voltage gain to the voltage gain of the load-independent point, so that the wireless charging system finally works at the load-independent point.
- the voltage regulation module can also be placed in the receiver, as explained in detail below.
- the wireless charging system is operated near the load-independent point, so that the voltage gain is independent of the magnitude of the load impedance of the receiver, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are fixed. value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the voltage gain of the load-independent point is also independent of the coupling coefficient. That is to say, in the wireless charging process, regardless of the offset between the transmitter and the receiver, the voltage gain at the load-independent point is constant. In regulating the operation of the wireless charging system at the load-independent point, it is only necessary to adjust the voltage gain between the output voltage of the receiver and the input voltage of the transmitter to In the vicinity, the working frequency of the wireless charging system for power transmission can be adjusted to the working frequency of the load-independent point through the closed loop function, and the wireless charging system can work at the load-independent point.
- FIG. 10 is a schematic structural diagram of still another wireless charging system according to an embodiment of the present application.
- the transmitter 10 may include: a DC power supply 101, a DC / AC converter module 102, the series matching capacitance (capacitance value C p) 103, the transmit coil 104 and the control module 105.
- the receiver 20 may include a receiving coil 201, a series matching capacitor (capacitance value C s ) 202 , an AC/DC conversion module 203 , a voltage stabilizing module 204 , a load output 205 , a modulation module 206 , a control module 207 , and a battery management system 208 . .
- the series matching capacitor 103 is the first series matching capacitor
- the series matching capacitor (capacitance value C s ) 202 is the second series matching capacitor.
- a voltage adjustment module 209 is further provided in the receiver for adjusting the output voltage of the receiver to set the voltage gain to the voltage gain X0 of the load-independent point.
- the voltage adjustment module 209 is configured to receive the voltage output by the AC/DC conversion module 203 and receive a control signal output by the control module 207 to adjust the voltage to set the voltage gain to the voltage gain X0 of the load-independent point.
- the voltage regulation module 209 is a second voltage regulation module.
- the process by which the receiver adjusts the output voltage of the receiver to the first output voltage is also a closed loop feedback adjustment process.
- the specific process is as follows: The output voltage of the receiver is gradually adjusted according to the first output voltage.
- the receiver obtains a voltage difference according to the calculation of the first output voltage and the output voltage of the voltage regulator module of the current receiver, and sends the voltage difference to the transmitter through in-band communication, and the transmitter adjusts according to the voltage difference. working frequency.
- the output voltage of the receiver is finally adjusted to the first output voltage, the voltage gain is the voltage gain X0 of the load-independent point, and the working frequency of the power transmission is the work at the load-independent point. frequency
- FIG. 11 is a schematic flowchart diagram of another wireless charging method according to an embodiment of the present application.
- the load-independent point of the wireless charging system ( The voltage gain in X0) is a constant X0. Regardless of the value of the coupling coefficient, the voltage gain at the load-independent point is X0.
- the wireless charging method can include the following steps:
- the transmitter sends information indicating a first input voltage to the receiver.
- the first input voltage is the input voltage of the transmitter.
- the receiver sets an output voltage of the receiver as the first output voltage according to the first input voltage and the first voltage gain.
- the transmitter transmits power to the receiver with a first voltage gain.
- the operating frequency at which the transmitter transmits power to the receiver is the first operating frequency
- the receiver The output voltage is the first output voltage
- the receiver adjusts the output voltage to the first output voltage and the voltage gain is At the time of the closed loop feedback adjustment, the transmitter adjusts the operating frequency of the transmission power to the operating frequency of the load independent point. At this point, the wireless charging system operates at a load-independent point.
- the voltage gain can be increased or decreased by an offset when the load-independent point voltage gain is set.
- the first voltage gain X0 can be satisfied Positive number. For example, setting the voltage gain value of the load-independent point Or (1-20%). It can be understood that the offset of the voltage gain setting is not limited in the embodiment of the present application, for example, the first voltage gain may be set as Or (1-30%), the range may be determined according to the wireless charging system design accuracy requirement, which is not limited in this application.
- the transmitter may receive information indicating the first output voltage sent by the receiver, and determine the input voltage of the transmitter as the first input voltage according to the first output voltage.
- the transmitter may be a first input voltage determined according to a pre-saved second mapping table.
- the second mapping table includes at least one output voltage and an input voltage of the transmitter corresponding to each of the at least one output voltage.
- the voltage adjusting module can refer to the embodiment described in FIG.
- the voltage regulating module is configured to adjust the input voltage of the transmitter to the first input voltage after the transmitter determines the input voltage of the transmitter as the first input voltage according to the first output voltage.
- the offset between the receiver and the transmitter changes, and the coupling coefficient between the inductor of the transmitter and the inductor of the receiver changes.
- the load-independent point at which the wireless charging system operates is ( X0).
- the coupling coefficient is K1
- the curve changes from 1 to 2, since the operating frequency is still The corresponding voltage gain becomes larger, causing the output voltage to deviate from the desired output voltage of the BMS.
- the receiver can perform the closed loop adjustment process.
- step S104 After the closed loop adjustment is completed, the voltage gain is pulled back to X0, and the corresponding working frequency is The wireless charging system operates at a load-independent point where the coupling coefficient is K1 ( X0).
- the first output voltage is obtained by multiplying the first input voltage by the first voltage gain.
- a first voltage gain may be transmitted from a transmitter to a receiver, the transmitter may be calculated and sent to the transmitter obtained according to C p and C s (or L s and L p).
- a first voltage gain may also be a transmitter in accordance with C p and C s (or L p and L s) is calculated, the receiver may receive information indicative of C p is sent from the transmitter in advance, or information indicating the L p.
- C p (L p ) and the first input voltage may be indicated by the same information, or may be indicated by different information, which is not limited in this application.
- the wireless charging system is operated near the load-independent point, so that the voltage gain is independent of the magnitude of the load impedance of the receiver, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are fixed. value. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved.
- the voltage gain of the load-independent point is also independent of the coupling coefficient. That is to say, in the wireless charging process, regardless of the offset between the transmitter and the receiver, the voltage gain at the load-independent point is constant. In regulating the operation of the wireless charging system at the load-independent point, it is only necessary to adjust the voltage gain between the output voltage of the receiver and the input voltage of the transmitter to In the vicinity, the working frequency of the wireless charging system for power transmission can be adjusted to the working frequency of the load-independent point through the closed loop function, and the wireless charging system can work at the load-independent point.
- the capacitance value and the inductance value can be designed according to the desired voltage gain.
- the voltage gain of the wireless charging system is set to the voltage gain corresponding to the load-independent point, that is, the first voltage gain.
- the wireless charging system operates at the load-independent point, and the change in the output resistance of the receiver does not affect the operating frequency of the transmission power.
- the change in the output resistance of the receiver does not cause a change in the voltage gain, thereby making the output voltage of the receiver constant.
- the output voltage jump caused by the output resistance jump of the receiver is reduced, thereby reducing the power consumed by the voltage regulator module and improving the charging efficiency.
- Table 1 is a kind of ( X0) Output voltage jump test result of load jump.
- Table 1 is a work at ( X0) Output voltage jump test result of load jump
- the Cp and Cs design values are satisfied. That is, the wireless charging system operates at the load-independent point, and the output resistance jump in the receiver causes the receiver current to have two transitions between 0.3A and 1.25A, causing the output voltage of the receiver to fluctuate by 0.65V and 0.66V, respectively. .
- the design values of Cp and Cs are not satisfied. That is, the wireless charging system does not work at the load-independent point, and the output resistance jump in the receiver causes the receiver current to have two transitions between 0.3A and 1.25A, causing the output voltage of the receiver to generate 4.8V and 3.6V, respectively. fluctuation. It can be seen that by setting the wireless charging system to work at the load-independent point, the output voltage jump caused by the output resistance jump of the receiver can be reduced, thereby reducing the power consumed by the voltage regulator module and improving the charging efficiency.
- the wireless charging system in the case of Const ⁇ 0, can also be designed to operate at a load-independent point.
- the circuit parameters L p , C p , L s and C s of the circuit transmitter and receiver do not satisfy Const ⁇ 0, the voltage gain at the load-independent point is no longer constant
- the voltage regulation module can be placed in the transmitter or the voltage regulation module can be placed in the receiver. According to the foregoing two manners, the embodiments of the present application respectively provide several embodiments for adjusting a method in which a wireless charging system operates at a load-independent point.
- FIG. 12 is a schematic flowchart diagram of still another wireless charging method according to an embodiment of the present application.
- the load-independent point of the wireless charging system ( The voltage gain X0 in X0) is related to the coupling coefficient.
- the wireless charging method can include the following steps:
- the receiver finds, from the first mapping table, that the first coupling degree corresponds to the first load-independent point, and the first load-independent point includes the first voltage gain.
- the receiver sends information indicating the first load-independent point to the transmitter.
- the receiver sends information indicating a first output voltage to the transmitter.
- the transmitter sets an input voltage of the transmitter as the first input voltage according to the first output voltage and the first voltage gain.
- the transmitter transmits power to the receiver with a first voltage gain.
- the transmitter transmits power to the receiver with the first voltage gain
- the first voltage gain is the voltage gain of the load-independent point
- the operating frequency at which the transmitter transmits power to the receiver is the first operating frequency
- the transmitter The input voltage is the first input voltage
- the receiver may pre-store the first mapping table, where the first mapping table may include at least one coupling degree, and at least one load-independent point corresponding to each coupling degree, and the load-independent point is a combination of voltage gain and operating frequency.
- the voltage gain in the load-independent point corresponding to the degree of coupling is independent of the output load of the receiver at the operating frequency in the load-independent point corresponding to each coupling degree.
- the above coupling degree may be a coupling coefficient or a mutual inductance, and the coupling coefficient is taken as an example below.
- the first mapping table can be divided into two forms depending on whether Const is known. The following is introduced separately.
- different coupling coefficients can be set in advance for load-independent point measurement, for example, the offset is changed in a fixed step size to test or calculate the corresponding coupling coefficient, and the load-independent point corresponding to the coupling coefficient.
- Table 2 is a schematic diagram of a first mapping table provided by an embodiment of the present application.
- the Const corresponding to the transmitter and receiver is Const0.
- the coupling coefficient corresponding to the offset s may be pre-tested and stored as Ku, and the load-independent point is (Xu, ), where n and u are both natural numbers.
- the receiver can pre-store the first mapping table described above.
- the receiver finds a corresponding load-independent point based on the detected offset between the receiver and the transmitter.
- the discovered load-independent points are then sent to the receiver. For example, if the receiver detects that the current offset from the transmitter is s2, according to the pre-stored first mapping table, the lookup table obtains a coupling coefficient of K2, and the load-independent point is (X2, ).
- the operating frequency It is regulated by a closed loop circuit and is passively regulated. It is not necessary to know the operating frequency.
- the specific value In order to reduce the amount of storage data and save the storage space, the receiver may also be a voltage gain X that only prestores the load-independent points in the first mapping table.
- Table 3 which is another example provided by the embodiment of the present application. Schematic diagram of the first mapping table.
- the Const corresponding to the transmitter and receiver is Const0.
- the receiver can pre-store the first mapping table described above.
- the receiver finds the voltage gain of the corresponding load-independent point based on the detected offset between the receiver and the transmitter.
- the voltage gain of the found load-independent point is then sent to the receiver. For example, if the receiver detects that the current offset from the transmitter is s2, according to the pre-stored first mapping table, the lookup table obtains a coupling coefficient of K2, and the voltage gain of the load-independent point is X2.
- the receiver or transmitter can also calculate the operating frequency of the load-independent point according to formula (3) and formula (6).
- Const can be changed in a fixed step size to test the different coupling coefficients under each Const, and the load-independent points corresponding to the coupling coefficients. Different load-independent points corresponding to Const and coupling coefficient K can be pre-stored.
- Table 4 is an example of still another first mapping table provided by the embodiment of the present application.
- the receiver can pre-store the first mapping table described above.
- the receiver can first acquire the Lp and Cp of the transmitter. And the Const is calculated, and the receiver finds the corresponding load-independent point according to the calculated Const and the detected offset between the receiver and the transmitter. The discovered load-independent points are then sent to the receiver. For example, if the receiver calculates Const as Const1, and the receiver detects that the current offset with the transmitter is s2, according to the pre-stored first mapping table, the table looks for the load-independent point (X12, ).
- the receiver may also be a voltage gain X that only prestores the load-independent points in the first mapping table.
- Table 5 is another first mapping table provided by the embodiment of the present application. Schematic diagram.
- the gain is Xvu.
- m, n, u, and v are all natural numbers.
- the receiver can pre-store the first mapping table described above.
- the receiver can first acquire the Lp and Cp of the transmitter. And the Const is calculated, and the receiver finds the voltage gain of the corresponding load-independent point according to the calculated Const and the detected offset between the receiver and the transmitter. The voltage gain of the found load-independent point is then sent to the receiver. For example, if the receiver calculates Const as Const1, and the receiver detects that the current offset from the transmitter is s2, the receiver looks up the voltage gain of the load-independent point to X12 according to the pre-stored first mapping table.
- the receiver Since the receiver is generally a mobile terminal, its ability to store and process data is very strong. Storing the first mapping table in the receiver can reduce the burden on the transmitter to process and store data, and can speed up the lookup of the table and reduce the adjustment. The delay of the load-independent point.
- the foregoing first mapping table may also be stored in the transmitter, and the transmitter may directly obtain the load-independent point through the look-up table, without sending through the receiver, which can reduce in-band communication and save signaling overhead.
- the voltage gain and operating frequency of the load-independent point do not change when the desired output voltage of the BMS changes in the receiver.
- the receiver or the transmitter does not need to re-query the first mapping table, and only needs to repeatedly perform steps S303-S305 to re-adjust the wireless charging system to the load-independent point according to the changed first output voltage and the voltage-independent point gain.
- the voltage gain can be set to the load-independent point of the voltage gain X0 or Reduce an offset.
- setting the voltage gain to the first voltage gain X0 the first voltage gain X0 can be satisfied Positive number.
- the wireless charging system can be set to work at the load-independent point by setting the voltage gain as the voltage gain of the load-independent point, so that the voltage gain and the load impedance of the receiver are It is irrelevant, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved. There is no need to limit the circuit parameters of the transmitter and receiver, which improves the versatility of the transmitter and receiver.
- the first voltage gain of the load-independent point is determined by the above manner of finding the first mapping table, and the circuit parameters in the transmitter and the receiver are not required to be satisfied.
- the k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2, and the wireless charging system can be set at a load-independent point. That is to say, the transmitter and receiver of any circuit parameter can make it work at the load-independent point, thereby improving the versatility of the transmitter and the receiver.
- the above describes the voltage regulation module is set in the transmitter, the transmitter adjusts the input voltage to adjust the voltage gain to the voltage gain of the load-independent point, so that the wireless charging system finally works at the load-independent point.
- the voltage regulation module can also be placed in the receiver, as explained in detail below.
- FIG. 13 is a schematic flowchart diagram of still another wireless charging method according to an embodiment of the present application.
- the load-independent point of the wireless charging system ( The voltage gain X0 in X0) is related to the coupling coefficient.
- the wireless charging method can include the following steps:
- the receiver finds, from the first mapping table, that the first coupling degree corresponds to the first load-independent point, and the first load-independent point includes the first voltage gain.
- the receiver receives information sent by the transmitter indicating the first input voltage.
- the receiver sets the output voltage of the receiver to the first output voltage according to the first input voltage and the first voltage gain.
- the transmitter transmits power to the receiver with a first voltage gain.
- the receiver may pre-store the first mapping table, where the first mapping table may include at least one coupling degree, and at least one load-independent point corresponding to each coupling degree, and the load-independent point is a combination of voltage gain and operating frequency.
- the voltage gain in the load-independent point corresponding to the degree of coupling is independent of the output load of the receiver at the operating frequency in the load-independent point corresponding to each coupling degree.
- the degree of coupling described above may be a coupling coefficient or a mutual inductance. The following is an example of mutual inductance.
- step S401 and step S402 are in no particular order.
- the transmitter may receive information indicating the first output voltage sent by the receiver, and determine the input voltage of the transmitter as the first input voltage according to the first output voltage.
- the transmitter may be a first input voltage determined according to a pre-saved second mapping table.
- the second mapping table includes at least one output voltage and an input voltage of the transmitter corresponding to each of the at least one output voltage.
- the voltage adjusting module can refer to the embodiment described in FIG.
- the voltage regulating module is configured to adjust the input voltage of the transmitter to the first input voltage after the transmitter determines the input voltage of the transmitter as the first input voltage according to the first output voltage.
- the wireless charging system When the wireless charging system performs power transmission at the load-independent point, if the receiver moves, the coupling coefficient changes, the voltage gain and the operating frequency of the load-independent point of the wireless charging system also change, and the load-independent point needs to be re-determined, and The wireless charging system adjusts to the load-independent point, that is, steps S401-S404 are repeatedly performed.
- the wireless charging system can be set to work at the load-independent point by setting the voltage gain as the voltage gain of the load-independent point, so that the voltage gain and the load impedance of the receiver are It is irrelevant, so that regardless of the output impedance of the receiver, the operating frequency and voltage gain of the transmitter transmitting power to the receiver are constant. That is, the output load impedance of the receiver does not affect the voltage gain between the output voltage of the receiver and the input voltage of the transmitter, so the output voltage of the receiver is constant, which can reduce the jump of the output voltage caused by the load jump. Therefore, the power loss of the voltage regulator module can be reduced, and the charging efficiency of the receiver can be improved. There is no need to limit the circuit parameters of the transmitter and receiver, which improves the versatility of the transmitter and receiver.
- the wireless charging system When the wireless charging system is charging, the wireless charging system is set at the load-independent point. At the load-independent point, the change of the output resistance of the receiver does not affect the operating frequency of the transmission power, and the output resistance of the receiver does not change.
- the voltage gain is changed, so that the output voltage of the receiver is constant, and the output voltage jump caused by the output resistance jump of the receiver is reduced, so that the power consumed by the voltage regulator module can be reduced, and the power conversion efficiency can be improved.
- FIG. 14 is a test result of electrical energy conversion efficiency provided by an embodiment of the present application.
- the test curve of the electrical energy conversion efficiency shown in Fig. 14 is the test result when the center of the transmitting coil of the transmitter is directly opposite to the center of the receiving coil of the receiver, that is, when the offset is zero.
- the electrical energy conversion efficiency can be understood as the ratio of the electrical energy output by the transmitter to the electrical energy used to power the load in the receiver.
- the power conversion efficiency of the wireless charging system operating at the load-independent point is greater than the power conversion efficiency from the load-independent point. Therefore, when the transmitter and the receiver are not biased, setting the wireless charging system to work at the load-independent point can improve the power conversion efficiency of the wireless charging system.
- FIG. 15 is a test result of another power conversion efficiency provided by an embodiment of the present application.
- the test curve of the electric energy conversion efficiency shown in Fig. 15 is a test result when the center of the transmitting coil of the transmitter deviates from the center of the receiving coil of the receiver by 10 mm, that is, when the offset is 10 mm.
- the power conversion efficiency of the wireless charging system operating at the load-independent point is greater than the power conversion efficiency away from the load-independent point. Therefore, when the transmitter and the receiver are biased, setting the wireless charging system to work at the load-independent point can improve the power conversion efficiency of the wireless charging system.
- the wireless charging system works at the load-independent point, since the voltage gain does not change with the load change of the receiver, the wireless charging system is equivalent to the transformer at this time, and therefore, the potential and the receiver of the output voltage of the DC/AC conversion module in the transmitter
- the phase of the input voltage of the AC/DC converter module is the same, and the phase of the input voltage of the AC/DC converter module in the receiver and the phase of the input current are also the same.
- the AC/DC converter module in the receiver is implemented using a rectifier diode circuit, the diode has a zero current turn-off characteristic in the case where the phase of the input voltage of the AC/DC converter module is the same as the phase of the input current.
- the zero current turn-off characteristic of the diode reduces electromagnetic interference and improves rectification efficiency.
- FIG. 16 is a schematic diagram of voltage and current testing according to an embodiment of the present application.
- the output voltage of the DC/AC converter module in the transmitter is V1
- the output current of the DC/AC converter module in the transmitter is I1
- the input voltage of the AC/DC converter module in the receiver is V2, receiving
- the input current of the AC/DC converter module in the device is I2
- the phases of V1 and V2 are the same
- the phases of V2 and I2 are the same.
- the AC/DC converter module of the receiver has a diode circuit for rectification
- the diode has zero. Current shutdown characteristics. The zero current turn-off characteristic of the diode reduces electromagnetic interference and improves rectification efficiency.
- FIG. 17 is a schematic structural diagram of a wireless charging system 100 according to an embodiment of the present application.
- Wireless charging system 100 includes a transmitter 10 and a receiver 20.
- the second oscillating circuit is configured to receive the power transmitted by the first oscillating circuit
- control unit 108 configured to set a voltage gain between an output voltage of the receiver 20 and an input voltage of the transmitter 10 as a first voltage gain
- the first voltage gain is X, and the X is satisfied Positive number, or, the X is satisfied a positive number; when the voltage gain between the output voltage of the receiver and the input voltage of the transmitter is the first voltage gain, the wireless charging system operates at a load-independent point; the load-independent point Composed of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain is independent of an output load of the receiver;
- the control unit 108 is further configured to control the first oscillating circuit 107 to transmit power to the receiver 20 at the first voltage gain.
- the k is 1, and the X is or
- the transmitter 10 further includes a receiving unit 109, which sets the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 to be the first A voltage gain, including:
- the receiving unit 109 is configured to receive, by the receiver 20, information indicating a first output voltage, where the first output voltage is a desired output voltage of the receiver;
- the control unit 108 is further configured to set an input voltage of the transmitter 10 as a first input voltage according to the first output voltage and the first voltage gain.
- the transmitter 10 may include a voltage adjustment module 106, and the control unit 108 sets the input voltage of the transmitter 10 as the first input voltage according to the first output voltage and the first voltage gain.
- the control unit 108 controls the voltage adjustment module 106 to set the input voltage of the transmitter 10 to the first input voltage according to the first output voltage and the first voltage gain.
- the receiving unit 109 before the control unit 108 sets the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 to the first voltage gain, the receiving unit 109 also uses Receiving information indicating the C s and/or information indicating the L s sent by the receiver 20, the C s and the L s are used by the transmitter 10 to determine the first voltage gain And/or the receiving unit 109 is configured to receive information sent by the receiver 20 indicating the first voltage gain.
- the receiver 20 includes a receiving coil 201 and a second series matching capacitor 202, and the receiving coil 201 and the second series matching capacitor 202 are connected in series to form a second oscillating circuit 210; the second oscillating circuit 210 is used to receive the power transmitted by the transmitter 10; the self-inductance value of the receiving coil 201 when receiving the power transmitted by the transmitter 10 is L s , and the capacitance value of the second series matching capacitor 202 is C s ; among them,
- the L p is a self-inductance value of the transmitting coil 104 in the transmitter 10 when transmitting power to the receiver 20, and the C p is a capacitance value of the first series matching capacitor 103 in the transmitter 10, k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2; the transmitting coil 104 and the first series matching capacitor 103 are connected in series to constitute a first oscillating circuit 107; the first oscillating circuit 107 is for omitting the second oscillating Circuit 210 transmit
- the receiver 20 further includes a transmitting unit 211 and a control unit 212, where:
- the sending unit 211 is configured to send, to the transmitter 10, information indicating a first output voltage, where the first output voltage is a desired output voltage of the receiver 20; the first output voltage is used for the
- the transmitter 10 sets the input voltage of the transmitter 10 to a first input voltage according to the first output voltage and the first voltage gain;
- the first voltage gain is X, and the X is satisfied Positive number, or, the X is satisfied a positive number; when the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 is the first voltage gain, the wireless charging system 100 operates at a load-independent point;
- the load independent point is comprised of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain is independent of an output load of the receiver;
- the control unit 212 is configured to control the second oscillating circuit 210 to receive the power transmitted by the transmitter 10 at the first voltage gain.
- the transmitter 10 may further include: a DC power source 101 and a DC/AC conversion module 102.
- the receiver 20 can include an AC/DC conversion module 203, a voltage regulation module 204, a load output 205, a modulation module 206, and a battery management system 208.
- control unit 108 may be implemented by the control module 105 in the embodiment described in FIG. 8.
- the control unit 211 may be implemented by the control module 207 in the embodiment described in FIG. 8.
- the control unit 108 may also have The other functions of the control module 105 can be specifically referred to the embodiment described in FIG. 8.
- the control unit 211 can also have other functions of the control module 207.
- the functions of the control unit 108, the receiving unit 109, the control unit 211, and the sending unit 212 may correspond to the corresponding description of the wireless charging method embodiment shown in FIG. 9, and details are not described herein again.
- control unit 108 is configured to find, from the first mapping table, that the first coupling degree corresponds to the first load-independent point;
- a receiving unit configured to receive, by the receiver, information indicating the first load-independent point, where the first load-independent point is a first coupling degree that is searched by the receiver from the first mapping table. a load-independent point;
- the first load-independent point includes the first voltage gain
- the first degree of coupling is a degree of coupling of a coil in the transmitter and a coil in the receiver
- the first mapping table includes At least one degree of coupling, and a load-independent point corresponding to each of the at least one degree of coupling, the load-independent point being a combination of a voltage gain and an operating frequency; at an operating frequency in a load-independent point corresponding to each coupling degree, The voltage gain in the load-independent point corresponding to the degree of coupling is independent of the output load of the receiver;
- the control unit 108 is further configured to set a voltage gain between an output voltage of the receiver and an input voltage of the transmitter as a first voltage gain;
- the control unit 108 is configured to control the first oscillating circuit 107 to transmit power to the receiver at the first voltage gain.
- control unit 108 sets the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 as a first voltage gain, including :
- the receiving unit 109 is configured to receive, by the receiver 20, information indicating a first output voltage, where the first output voltage is a desired output voltage of the receiver; and the transmitter 10 is configured according to the first output voltage And the first voltage gain sets an input voltage of the transmitter to a first input voltage.
- the receiving unit 109 is further configured to receive Information indicating the C s and/or information indicating the L s sent by the receiver 20, the C s and the L s being used by the transmitter 10 to determine the first voltage gain; And/or, the transmitter 10 receives information sent by the receiver 20 indicating the first voltage gain.
- the transmitting unit 212 is configured to send, to the transmitter 10, information indicating a first output voltage, the first output voltage being a desired output voltage of the receiver 20; the first output voltage is used for
- the transmitter 10 sets the input voltage of the transmitter 10 to a first input voltage according to the first output voltage and the first voltage gain; the first voltage gain is included in the transmitter 10 from a first mapping table The first degree of coupling is found to correspond to the first load-independent point; or the first voltage gain is included in the first load-independent point that the receiver 20 finds from the first mapping table corresponds to the first load-independent point;
- the first load-independent point is sent by the receiver 20 to the transmitter 10 in information indicating the first load-independent point;
- the first degree of coupling is a degree of coupling of the transmitting coil 104 in the transmitter 20 and the receiving coil 201 in the receiver 20
- the first mapping table includes at least one coupling degree, and the at least a load-independent point corresponding to each of the coupling degrees, wherein the load-independent point is a combination of a voltage gain and an operating frequency; at a working frequency in a load-independent point corresponding to each coupling degree, the load-independent point corresponding to the coupling degree
- the voltage gain in the middle is independent of the output load of the receiver;
- the control unit 211 is configured to control the second oscillating circuit to receive the power transmitted by the transmitter 10 at the first voltage gain.
- control unit 108 may be implemented by the control module 105 in the embodiment described in FIG. 8.
- the control unit 211 may be implemented by the control module 207 in the embodiment described in FIG. 8.
- the control unit 108 may also be The controller 30 in the embodiment described in FIG. 19, the control unit 211 may also be the controller 40 in the embodiment described in FIG. 19, and the control unit 108 may further have other functions of the control module 105.
- the control unit 211 may also have other functions of the control module 207, and may be specifically referred to the embodiment described in FIG.
- the functions of the control unit 108, the receiving unit 109, the control unit 211, and the sending unit 212 may correspond to the corresponding description of the wireless charging method embodiment shown in FIG. 12, and details are not described herein again.
- FIG. 18 is a schematic structural diagram of another wireless charging system 100 according to an embodiment of the present application.
- Wireless charging system 100 includes a transmitter 10 and a receiver 20.
- the second oscillating circuit is configured to receive the power transmitted by the first oscillating circuit
- the sending unit 108 is configured to send, to the receiver 20, information indicating a first input voltage, where the first input voltage is an input voltage of the transmitter 10; the first input voltage is used for the receiving Setting the output voltage of the receiver to a first output voltage according to the first input voltage and the first voltage gain;
- the first voltage gain is X, and the X is satisfied Positive number, or, the X is satisfied a positive number; when the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 is the first voltage gain, the wireless charging system 100 operates at a load-independent point;
- the load independent point is comprised of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain is independent of an output load of the receiver 20;
- the control unit 109 is configured to control the power that the first oscillating circuit 107 transmits to the receiver 20 with the first voltage gain.
- the receiver 20 includes a receiving coil 201 and a second series matching capacitor 202.
- the receiving coil 201 and the second series matching capacitor 202 are connected in series to form a second oscillating circuit 210; the second oscillating circuit 210 is used to receive the power transmitted by the transmitter 10; the self-inductance value of the receiving coil 201 when receiving the power transmitted by the transmitter 10 is L s , and the capacitance value of the second series matching capacitor 202 is C s ; among them,
- the L p is a self-inductance value of the transmitting coil 104 in the transmitter 10 when transmitting power to the receiver 20, and the C p is a capacitance value of the first series matching capacitor 103 in the transmitter 10, k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2; the transmitting coil 104 and the first series matching capacitor 103 are connected in series to constitute a first oscillating circuit 107; the first oscillating circuit 107 is for omitting the second oscillating Circuit 210 transmits
- the receiver 20 also includes a control unit 211, wherein:
- the control unit 211 is configured to set a voltage gain between an output voltage of the receiver 20 and an input voltage of the transmitter 10 as a first voltage gain;
- the first voltage gain is X, and the X is satisfied Positive number, or, the X is satisfied a positive number; when the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 is the first voltage gain, the wireless charging system 100 operates at a load-independent point;
- the load independent point is comprised of a first operating frequency and the first voltage gain; at the first operating frequency, the first voltage gain is independent of an output load of the receiver 20;
- the control unit 211 is further configured to control the second oscillating circuit 210 to receive the power transmitted by the transmitter 10 at the first voltage gain.
- the k is 1, and the X is or
- the receiver 20 further includes a receiving unit 212, which sets a voltage gain between an output voltage of the receiver 20 and an input voltage of the transmitter 10 to be the first A voltage gain, including:
- the receiving unit 212 is configured to receive information sent by the transmitter 10 indicating a first input voltage, where the first input voltage is an input voltage of the transmitter 10;
- the control unit 211 is further configured to set an output voltage of the receiver 20 to a first output voltage according to the first input voltage and the first voltage gain.
- the receiver 10 may include a voltage adjustment module 209, and the control unit 211 sets the output voltage of the receiver 20 to the first output voltage according to the first input voltage and the first voltage gain, including The control unit 211 controls the voltage adjustment module 209 to set the output voltage of the receiver 10 to the first output voltage according to the first output voltage and the first voltage gain.
- the receiving unit 212 Before the control unit 211 sets the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 to the first voltage gain, the receiving unit 212, Also for receiving information indicating the C p sent by the transmitter 10 and/or information indicating the L p , the C p and the L p being used by the receiver 20 to determine the first The voltage gain; and/or the receiving unit 212 is further configured to receive information sent by the transmitter 10 indicating the first voltage gain.
- the transmitter 10 may further include: a DC power source 101 and a DC/AC conversion module 102.
- the receiver 20 may further include an AC/DC conversion module 203, a voltage stabilization module 204, a load output 205, a modulation module 206, and a battery management system 208.
- control unit 109 may be implemented by the control module 105 in the embodiment described in FIG. 10, and the control unit 211 may also be implemented by the control module 207 in the embodiment described in FIG.
- the control unit 211 may also have other functions of the control module 207, and may be specifically referred to the embodiment described in FIG.
- the functions of the control unit 109, the sending unit 108, the control unit 211, and the receiving unit 212 may correspond to the corresponding description of the wireless charging method embodiment shown in FIG. 11, and details are not described herein again.
- the transmitting unit 108 is configured to send, to the receiver 20, information indicating a first input voltage, the first input voltage being the transmitting An output voltage of the device 10; the first input voltage is used by the receiver 20 to set an output voltage of the receiver 20 to a first output voltage according to the first input voltage and a first voltage gain; a voltage gain is included in the first load-independent point that the transmitter 10 finds from the first mapping table corresponds to the first load-independent point; or the first voltage gain is included in the receiver 20 from the first mapping table The first degree of coupling is found to correspond to the first load-independent point; the first load-independent point is that the receiver carries the information to the transmitter 10 in the information indicating the first load-independent point;
- the first degree of coupling is a degree of coupling of the transmitting coil 104 in the transmitter 10 and the receiving coil 201 in the receiver 20, the first mapping table including at least one coupling degree, and the at least a load-independent point corresponding to each of the coupling degrees, wherein the load-independent point is a combination of a voltage gain and an operating frequency; at a working frequency in a load-independent point corresponding to each coupling degree, the load-independent point corresponding to the coupling degree
- the voltage gain in the middle is independent of the output load of the receiver;
- the control unit 109 is configured to control the power that the first oscillating circuit 107 transmits to the receiver 20 with the first voltage gain.
- control unit 211 is configured to find, from the first mapping table, that the first coupling degree corresponds to the first load-independent point;
- the receiving unit 212 is configured to receive, by the transmitter 10, information indicating the first load-independent point, where the first load-independent point is the first coupling that the transmitter 10 finds from the first mapping table. The degree corresponds to the first load-independent point;
- the first load-independent point includes the first voltage gain, the first degree of coupling being a degree of coupling of the transmit coil 104 in the transmitter 20 and the receive coil 201 in the receiver 20;
- the first mapping table includes at least one coupling degree, and a load independent point corresponding to each of the at least one coupling degree, wherein the load independent point is a combination of a voltage gain and an operating frequency; and a load-independent point corresponding to each coupling degree In the operating frequency of the medium, the voltage gain in the load-independent point corresponding to the degree of coupling is independent of the output load of the receiver;
- the control unit 211 is further configured to set a voltage gain between an output voltage of the receiver 20 and an input voltage of the transmitter 10 as a first voltage gain;
- the control unit 211 is further configured to control the second oscillating circuit 210 to receive the power transmitted by the transmitter 10 at the first voltage gain.
- control unit 211 sets the voltage gain between the output voltage of the receiver 20 and the input voltage of the transmitter 10 as the first voltage gain, including:
- the receiving unit 212 is further configured to receive, by the transmitter 10, information indicating a first input voltage, where the first input voltage is an input voltage of the transmitter 10;
- the control unit 211 is further configured to set an output voltage of the receiver to a first output voltage according to the first input voltage and the first voltage gain.
- the receiving unit 212 is further configured to receive said information indicating said C p and / or information indicative of the L p transmitted by the transmitter 10, the L p C p and the voltage gain of 20 for a first receiver of said determined; and And/or the receiver 20 receives information sent by the transmitter 10 indicating the first voltage gain.
- control unit 109 may be implemented by the control module 105 in the embodiment described in FIG. 10, and the control unit 211 may be implemented by the control module 207 in the embodiment described in FIG.
- the other functions of the control module 105 can be specifically referred to the embodiment described in FIG. 10.
- the control unit 211 can also have other functions of the control module 207, and can be specifically referred to the embodiment described in FIG.
- the functions of the control unit 108, the receiving unit 109, the control unit 211, and the sending unit 212 may correspond to the corresponding description of the wireless charging method embodiment shown in FIG. 13, and details are not described herein again.
- FIG. 19 is a schematic structural diagram of still another wireless charging system 100 according to an embodiment of the present application.
- Wireless charging system 100 includes a transmitter 10 and a receiver 20.
- the second oscillating circuit is configured to receive power transmitted by the first oscillating circuit;
- processors 301, memory 302, and communication interface 303 may be connected by bus 304 or other means, and FIG. 19 is exemplified by a bus connection. among them:
- Communication interface 303 can be used by transmitter 10 to communicate with other communication devices, such as receiver 20.
- the transmitter 10 and the receiver 20 may be the transmitter 10 and the receiver 20 shown in FIG. 8 or FIG.
- the communication interface 303 can be an in-band communication communication interface in a wireless charging system.
- the in-band communication reference may be made to the embodiment described in FIG.
- the communication interface 303 may also be an out-band interface, such as a Bluetooth communication interface, a Zigbee communication interface, a WiFi communication interface, or the like, and may be extended to other communication interfaces, which is not limited in this embodiment of the present application.
- Memory 302 is coupled to processor 301 for storing various software programs and/or sets of instructions.
- the memory 302 can also store a data transfer program that can be used to communicate with one or more additional devices, one or more transmitters, one or more receivers.
- the memory 302 can be used to store an implementation of the wireless charging method provided by one or more embodiments of the present application on the transmitter 10 side.
- implementation of the wireless charging method provided by one or more embodiments of the present application please refer to the embodiments described in FIGS. 9 and 12.
- the processor 301 can be used to read and execute computer readable instructions. Specifically, the processor 301 can be used to invoke a program stored in the memory 302, such as the implementation of the wireless charging method provided by one or more embodiments of the present application on the transmitter 10 side, and execute the instructions contained in the program.
- the transmitter 10 shown in FIG. 19 is only one implementation of the embodiment of the present application. In practical applications, the transmitter 10 may further include more or fewer components, which are not limited herein.
- the receiver 20 includes a receiving coil 201 and a second series matching capacitor 202.
- the receiving coil 201 and the second series matching capacitor 202 are connected in series to form a second oscillating circuit 210; the second oscillating circuit 210 is used to receive the power transmitted by the transmitter 10; the self-inductance value of the receiving coil 201 when receiving the power transmitted by the transmitter 10 is L s , and the capacitance value of the second series matching capacitor 202 is C s ; among them,
- the L p is a self-inductance value of the transmitting coil 104 in the transmitter 10 when transmitting power to the receiver 20, and the C p is a capacitance value of the first series matching capacitor 103 in the transmitter 10, k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2; the transmitting coil 104 and the first series matching capacitor 103 are connected in series to constitute a first oscillating circuit 107; the first oscillating circuit 107 is for omitting the second oscillating Circuit 210 transmits
- the receiver 20 further includes a controller 40, and the controller 40 includes:
- processors 401, memory 402, and communication interface 403 may be connected by bus 404 or other means, as illustrated in Figure 19 by way of a bus connection. among them:
- Communication interface 403 can be used by receiver 20 to communicate with other communication devices, such as transmitter 10.
- the transmitter 10 and the receiver 20 may be the transmitter 10 and the receiver 20 shown in FIG. 8 or FIG.
- the communication interface 403 may be an in-band communication communication interface in a wireless charging system.
- the in-band communication reference may be made to the embodiment described in FIG.
- the communication interface 303 may also be an out-band interface, such as a Bluetooth communication interface, a Zigbee communication interface, a WiFi communication interface, or the like, and may be extended to other communication interfaces, which is not limited in this embodiment of the present application.
- Memory 402 is coupled to processor 401 for storing various software programs and/or sets of instructions.
- the memory 402 can also store a data transfer program that can be used to communicate with one or more additional devices, one or more transmitters, one or more receivers.
- the memory 402 can be used to store an implementation of the wireless charging method provided on one or more embodiments of the present application on the receiver 20 side. With regard to implementation of the wireless charging method provided by one or more embodiments of the present application, please refer to the embodiments described in FIGS. 9 and 12.
- the processor 401 can be used to read and execute computer readable instructions. Specifically, the processor 401 can be used to invoke a program stored in the memory 402, such as the implementation of the wireless charging method provided by one or more embodiments of the present application on the receiver 20 side, and execute the instructions contained in the program.
- the receiver 20 shown in FIG. 19 is only one implementation of the embodiment of the present application. In practical applications, the receiver 20 may further include more or fewer components, which are not limited herein.
- the receiver 20 can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality terminal device, and an augmented reality terminal device.
- the receiver 20 can also be a wireless charging electric vehicle, a white household appliance, such as a tailless television, a wireless charging soymilk machine. , sweeping robots with wireless charging and multi-rotor drones, etc.
- FIG. 20 is a schematic structural diagram of still another wireless charging system 100 according to an embodiment of the present application.
- Wireless charging system 100 includes a transmitter 10 and a receiver 20.
- the second oscillating circuit is configured to receive the power transmitted by the first oscillating circuit
- processors 501, memory 502, and communication interface 503 may be connected by bus 504 or other means, and FIG. 20 is exemplified by a bus connection. among them:
- Communication interface 503 can be used by transmitter 10 to communicate with other communication devices, such as receiver 20.
- the transmitter 10 and the receiver 20 may be the transmitter 10 and the receiver 20 shown in FIG. 10 or FIG.
- the communication interface 503 may be an in-band communication communication interface in a wireless charging system.
- the in-band communication reference may be made to the embodiment described in FIG.
- the communication interface 303 may also be an out-band interface, such as a Bluetooth communication interface, a Zigbee communication interface, a WiFi communication interface, or the like, and may be extended to other communication interfaces, which is not limited in this embodiment of the present application.
- Memory 502 is coupled to processor 501 for storing various software programs and/or sets of instructions.
- the memory 502 can also store a data transfer program that can be used to communicate with one or more additional devices, one or more transmitters, one or more receivers.
- the memory 502 can be used to store an implementation of the wireless charging method provided on one or more embodiments of the present application on the transmitter 10 side.
- implementation of the wireless charging method provided by one or more embodiments of the present application please refer to the embodiments described in FIGS. 11 and 13.
- Processor 501 can be used to read and execute computer readable instructions. Specifically, the processor 501 can be used to invoke a program stored in the memory 502, such as the implementation of the wireless charging method provided by one or more embodiments of the present application on the transmitter 10 side, and execute the instructions contained in the program.
- a program stored in the memory 502 such as the implementation of the wireless charging method provided by one or more embodiments of the present application on the transmitter 10 side, and execute the instructions contained in the program.
- the transmitter 10 shown in FIG. 20 is only one implementation of the embodiment of the present application. In practical applications, the transmitter 10 may further include more or fewer components, which are not limited herein.
- the transmitter 10 may further include: a DC power source 101 and a DC/AC conversion module 102.
- the receiver 20 can include an AC/DC conversion module 203, a voltage regulation module 204, a load output 205, a modulation module 206, and a battery management system 208.
- the receiver 20 includes a receiving coil 201 and a second series matching capacitor 202, and the receiving coil 201 and the second series matching capacitor 202 are connected in series to form a second oscillating circuit 210; the second oscillating circuit 210 is used to receive the power transmitted by the transmitter 10; the self-inductance value of the receiving coil 201 when receiving the power transmitted by the transmitter 10 is L s , and the capacitance value of the second series matching capacitor 202 is C s ; among them,
- the L p is a self-inductance value of the transmitting coil 104 in the transmitter 10 when transmitting power to the receiver 20, and the C p is a capacitance value of the first series matching capacitor 103 in the transmitter 10, k is a positive number satisfying 0.8 ⁇ k ⁇ 1.2; the transmitting coil 104 and the first series matching capacitor 103 are connected in series to constitute a first oscillating circuit 107; the first oscillating circuit 107 is for omitting the second oscillating
- the circuit 210 is
- the receiver 20 further includes a controller 60, and the controller 60 includes:
- processors 601, memory 602, and communication interface 603 may be connected by bus 604 or other means, and FIG. 20 is exemplified by a bus connection. among them:
- Communication interface 603 can be used by receiver 20 to communicate with other communication devices, such as transmitter 10.
- the transmitter 10 and the receiver 20 may be the transmitter 10 and the receiver 20 shown in FIG. 10 or FIG.
- the communication interface 603 may be an in-band communication communication interface in a wireless charging system.
- the in-band communication reference may be made to the embodiment described in FIG.
- the communication interface 603 may also be an out-band interface, such as a Bluetooth communication interface, a Zigbee communication interface, a WiFi communication interface, or the like, and may be extended to other communication interfaces, which is not limited in this embodiment of the present application.
- an out-band interface such as a Bluetooth communication interface, a Zigbee communication interface, a WiFi communication interface, or the like, and may be extended to other communication interfaces, which is not limited in this embodiment of the present application.
- Memory 602 is coupled to processor 601 for storing various software programs and/or sets of instructions.
- the memory 602 can also store a data transfer program that can be used to communicate with one or more additional devices, one or more transmitters, one or more receivers.
- the memory 602 can be used to store an implementation of the wireless charging method provided on one or more embodiments of the present application on the receiver 20 side.
- implementation of the wireless charging method provided by one or more embodiments of the present application please refer to the embodiments described in FIGS. 11 and 13.
- the processor 601 can be used to read and execute computer readable instructions. Specifically, the processor 601 can be used to invoke a program stored in the memory 602, such as the implementation of the wireless charging method provided by one or more embodiments of the present application on the receiver 20 side, and execute the instructions contained in the program.
- the receiver 20 shown in FIG. 20 is only one implementation of the embodiment of the present application. In practical applications, the receiver 20 may further include more or fewer components, which are not limited herein.
- the transmitter 10 may further include: a DC power source 101 and a DC/AC conversion module 102.
- the receiver 20 can include an AC/DC conversion module 203, a voltage regulation module 204, a load output 205, a modulation module 206, and a battery management system 208.
- the transmitter chip implements the functions of the transmitter in the above-described method embodiments.
- the transmitter chip transmits information to other modules in the transmitter (such as a radio frequency module or antenna), and the information is sent to the receiver via other modules of the transmitter; or the transmitter chip can also be from other devices in the transmitter device
- the receiver chip implements the function of the receiver in the above method embodiment.
- the receiver chip transmits information to other modules in the receiver (such as a radio frequency module or an antenna), and the information is sent to the receiver via other modules of the receiver; or the receiver chip can also be from other devices in the receiver device
- a module such as a radio frequency module or antenna, receives information that is sent to the transmitter device by the receiver device.
- processors in the embodiment of the present application may be a central processing unit (CPU), and may be other general-purpose processors, digital signal processors (DSPs), and application specific integrated circuits. (Application Specific Integrated Circuit, ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof.
- a general purpose processor can be a microprocessor or any conventional processor.
- the method steps in the embodiments of the present application may be implemented by means of hardware, or may be implemented by a processor executing software instructions.
- the software instructions may be composed of corresponding software modules, which may be stored in random access memory (RAM), flash memory, read-only memory (ROM), programmable read only memory (Programmable ROM, PROM), Erasable PROM (EPROM), Electrically Erasable Programmable Read Only Memory (EEPROM), Register, Hard Disk, Mobile Hard Disk, CD-ROM, or any of those well known in the art Other forms of storage media.
- An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium.
- the storage medium can also be an integral part of the processor.
- the processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a transmitting device or a receiving device. Of course, the processor and the storage medium can also exist as discrete components in the transmitting device or the receiving device.
- the computer program product includes one or more computer instructions.
- the computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable device.
- the computer instructions can be stored in or transmitted by a computer readable storage medium.
- the computer instructions can be from a website site, computer, server or data center to another website site by wire (eg, coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (eg, infrared, wireless, microwave, etc.) Transfer from a computer, server, or data center.
- the computer readable storage medium can be any available media that can be accessed by a computer or a data storage device such as a server, data center, or the like that includes one or more available media.
- the usable medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a DVD), or a semiconductor medium (eg, a Solid State Disk (SSD)) or the like.
- the program can be stored in a computer readable storage medium, when the program is executed
- the flow of the method embodiments as described above may be included.
- the foregoing storage medium includes various media that can store program codes, such as a ROM or a random access memory RAM, a magnetic disk, or an optical disk.
Abstract
Description
偏位s | 耦合系数K | 负载无关点的电压增益X |
s0 | K0 | X0 |
s1 | K1 | X1 |
s2 | K2 | X2 |
…… | …… | …… |
sn | Kn | Xn |
Claims (33)
- 一种无线充电系统,其特征在于,所述无线充电系统包括发射器和接收器,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路,所述第一振荡电路用于向所述接收器传递功率;所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;
- 根据权利要求1至3任一项所述的无线充电系统,其特征在于,所述发射器还包括第一电压调节模块,所述第一电压调节模块与所述第一振荡电路并联;所述第一电压调节模块,用于通过调节所述发射器的输入电压来将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益。
- 根据权利要求1至4任一项所述的无线充电系统,其特征在于,所述接收器还包括第二电压调节模块,所述第二电压调节模块与所述第二振荡电路并联;所述第二电压调节模块,用于通过调节所述接收器的输出电压来将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为所述第一电压增益。
- 一种发射器,其特征在于,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路;所述第一振荡电路用于向接收器传递功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配 电容的电容值为C p;其中,L p*C p=k*L s*C s;所述L s是所述接收器中接收线圈在接收所述第一振荡电路传输的功率时的自感值,所述C s是所述接收器中第二串联匹配电容的电容值,所述k是满足0.8≤k≤1.2的正数;所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率。
- 根据权利要求6至8任一项所述的发射器,其特征在于,所述发射器还包括电压调节模块,所述电压调节模块与所述第一振荡电路并联;所述电压调节模块,用于通过调节所述发射器的输入电压来将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为所述第一电压增益。
- 根据权利要求10至12任一项所述的接收器,其特征在于,所述接收器还包括电压调节模块,所述电压调节模块与所述第二振荡电路并联;所述电压调节模块,用于通过调节所述接收器的输出电压来将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为所述第一电压增益。
- 一种基于无线充电系统的充电方法,其特征在于,所述无线充电系统包括发射器和接收器,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路,所述第一振荡电路用于向所述接收器传递功率;所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配电容的电容值为C p;所述接收线圈在接收所述第一振荡电路传输的功率时的自感值为L s,所述第二串联匹配电容的电容值为C s;其中, 所述k为满足0.8≤k≤1.2的正数;所述方法包括:所述发射器将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述发射器以所述第一电压增益向所述接收器传输功率。
- 根据权利要求14或15所述的方法,其特征在于,所述发射器将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益,包括:所述发射器接收所述接收器发送的指示第一输出电压的信息,所述第一输出电压是所述接收器的期望输出电压;所述发射器根据所述第一输出电压和所述第一电压增益将所述发射器的输入电压设置为第一输入电压。
- 根据权利要求14至16任一项所述的方法,其特征在于,所述发射器将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益之前,所述方法还包括:所述发射器接收所述接收器发送的指示所述Cs的信息和/或指示所述Ls的信息,所述Cs和所述Ls用于所述发射器确定所述第一电压增益;和/或,所述发射器接收所述接收器发送的指示所述第一电压增益的信息。
- 一种基于无线充电系统的充电方法,其特征在于,所述无线充电系统包括发射器和接收器,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路,所述第一振荡电路用于向所述接收器传递功率;所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配电容的电容值为C p;所述接收线圈在接收所述第一振荡电路传输的功率时的自感值为L s,所述第二串联匹配电容的电容值为C s;其中, 所述k为满足0.8≤k≤1.2的正数;所述方法包括:所述接收器向所述发射器发送指示第一输出电压的信息,所述第一输出电压是所述接收器的期望输出电压;所述第一输出电压用于所述发射器根据所述第一输出电压和所述第一电压增益将所述发射器的输入电压设置为第一输入电压;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述接收器接收所述发射器以所述第一电压增益传输的功率。
- 一种基于无线充电系统的充电方法,其特征在于,所述无线充电系统包括发射器和接收器,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路,所述第一振荡电路用于向所述接收器传递功率;所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配电容的电容值为C p;所述接收线圈在接收所述第一振荡电路传输的功率时的自感值为L s,所述第二串联匹配电容的电容值为C s;其中, 所述k为满足0.8≤k≤1.2的正数;所述方法包括:所述接收器将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述接收器接收所述发射器以所述第一电压增益传输的功率。
- 根据权利要求19或20所述的方法,其特征在于,所述接收器将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益,包括:所述接收器接收所述发射器发送的指示第一输入电压的信息,所述第一输入电压是所述发射器的输入电压;所述接收器根据所述第一输入电压和第一电压增益将所述接收器的输出电压设置为第一输出电压。
- 根据权利要求19至21任一项所述的方法,其特征在于,所述接收器将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益之前,所述方法还包括:所述接收器接收所述发射器发送的指示所述C p的信息和/或指示所述L p的信息,所述C p和所述L p用于所述接收器确定所述第一电压增益;和/或,所述接收器接收所述发射器发送的指示所述第一电压增益的信息。
- 一种基于无线充电系统的充电方法,其特征在于,所述无线充电系统包括发射器 和接收器,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路,所述第一振荡电路用于向所述接收器传递功率;所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配电容的电容值为C p;所述接收线圈在接收所述第一振荡电路传输的功率时的自感值为L s,所述第二串联匹配电容的电容值为C s;其中, 所述k为满足0.8≤k≤1.2的正数;所述方法包括:所述发射器向所述接收器发送指示第一输入电压的信息,所述第一输入电压是所述发射器的输入电压;所述第一输入电压用于所述接收器根据所述第一输入电压和所述第一电压增益将所述接收器的输出电压设置为第一输出电压;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述发射器以所述第一电压增益向所述接收器传输的功率。
- 一种发射器,其特征在于,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路;所述第一振荡电路用于向接收器传递功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配电容的电容值为C p;其中,L p*C p=k*L s*C s;所述L s是所述接收器中接收线圈在接收所述第一振荡电路传输的功率时的自感值,所述C s是所述接收器中第二串联匹配电容的电容值,所述k是满足0.8≤k≤1.2的正数;所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;所述发射器还包括:控制单元,用于将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作 频率上,所述第一电压增益与所述接收器的输出负载无关;所述控制单元,还用于控制所述第一振荡电路以所述第一电压增益向所述接收器传输功率。
- 根据权利要求24或25所述的发射器,其特征在于,所述发射器还包括接收单元,所述控制单元将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益,包括:所述接收单元,用于接收所述接收器发送的指示第一输出电压的信息,所述第一输出电压是所述接收器的期望输出电压;所述控制单元,还用于根据所述第一输出电压和所述第一电压增益将所述发射器的输入电压设置为第一输入电压。
- 根据权利要求24至26任一项所述的发射器,其特征在于,所述控制单元将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益之前,所述接收单元,还用于接收所述接收器发送的指示所述C s的信息和/或指示所述L s的信息,所述C s和所述L s用于所述发射器确定所述第一电压增益;和/或,所述接收单元,用于接收所述接收器发送的指示所述第一电压增益的信息。
- 一种接收器,其特征在于,所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收发射器传递的功率;所述接收线圈在接收所述发射器传输的功率时的自感值为L s,所述第二串联匹配电容的电容值为C s;其中, 所述L p是所述发射器中发射线圈在向接收器传递功率时的自感值,所述C p是所述发射器中第一串联匹配电容的电容值,所述k是满足0.8≤k≤1.2的正数;所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路;所述第一振荡电路用于向所述第二振荡电路传递功率;所述接收器还包括发送单元和控制单元,其中:所述发送单元,用于向所述发射器发送指示第一输出电压的信息,所述第一输出电压是所述接收器的期望输出电压;所述第一输出电压用于所述发射器根据所述第一输出电压和所述第一电压增益将所述发射器的输入电压设置为第一输入电压;其中,所述第一电压增益为X,所述X为满足 的正数, 或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述控制单元,用于控制所述第二振荡电路接收所述发射器以所述第一电压增益传输的功率。
- 一种接收器,其特征在于,所述接收器包含接收线圈和第二串联匹配电容,所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收发射器传递的功率;所述接收线圈在接收所述发射器传输的功率时的自感值为L s,所述第二串联匹配电容的电容值为C s;其中, 所述L p是所述发射器中发射线圈在向接收器传递功率时的自感值,所述C p是所述发射器中第一串联匹配电容的电容值,所述k是满足0.8≤k≤1.2的正数;所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路;所述第一振荡电路用于向所述第二振荡电路传递功率;所述接收器还包括控制单元,其中:所述控制单元,用于将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述控制单元,还用于控制所述第二振荡电路接收所述发射器以所述第一电压增益传输的功率。
- 根据权利要求29或30所述的接收器,其特征在于,所述接收器还包括接收单元,所述控制单元将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益,包括:所述接收单元,用于接收所述发射器发送的指示第一输入电压的信息,所述第一输入电压是所述发射器的输入电压;所述控制单元,还用于根据所述第一输入电压和第一电压增益将所述接收器的输出电压设置为第一输出电压。
- 根据权利要求29至31任一项所述的接收器,其特征在于,所述控制单元将所述接收器的输出电压与所述发射器的输入电压之间的电压增益设置为第一电压增益之前,所述接收单元,还用于接收所述发射器发送的指示所述C p的信息和/或指示所述L p的信息,所述C p和所述L p用于所述接收器确定所述第一电压增益;和/或,所述接收单元,还用于接收所述发射器发送的指示所述第一电压增益的信息。
- 一种发射器,其特征在于,所述发射器包含发射线圈和第一串联匹配电容,所述发射线圈和所述第一串联匹配电容串联以构成第一振荡电路;所述第一振荡电路用于向接收器传递功率;所述发射线圈在向所述接收器传递功率时的自感值为L p,所述第一串联匹配电容的电容值为C p;其中,L p*C p=k*L s*C s;所述L s是所述接收器中接收线圈在接收所述第一振荡电路传输的功率时的自感值,所述C s是所述接收器中第二串联匹配电容的电容值,所述k是满足0.8≤k≤1.2的正数;所述接收线圈和所述第二串联匹配电容串联以构成第二振荡电路;所述第二振荡电路用于接收所述第一振荡电路传递的功率;所述发射器还包括控制单元和发送单元,其中:所述发送单元,用于向所述接收器发送指示第一输入电压的信息,所述第一输入电压是所述发射器的输入电压;所述第一输入电压用于所述接收器根据所述第一输入电压和所述第一电压增益将所述接收器的输出电压设置为第一输出电压;其中,所述第一电压增益为X,所述X为满足 的正数,或者,所述X为满足 的正数;在所述接收器的输出电压与所述发射器的输入电压之间的电压增益为所述第一电压增益时,所述无线充电系统工作在负载无关点;所述负载无关点由第一工作频率和所述第一电压增益组成;在所述第一工作频率上,所述第一电压增益与所述接收器的输出负载无关;所述控制单元,用于控制所述第一振荡电路以所述第一电压增益向所述接收器传输的功率。
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