TW201605141A - System and method for wirelessly transmitting power - Google Patents

Abstract

The present invention provides a system and a method for wirelessly transmitting power to an outer electric device. In the method, a first primary coil is enabled to transmit a first power to the outer electric device, and a first sensing signal is induced from the first primary coil according to the relative position between the first primary coil and the outer electric device. And, a second primary coil is enabled to transmit a second power to the outer electric device, and a second sensing signal is induced from the second primary coil according to the relative position between the second primary coil and the outer electric device. Then, the first power and/or the second power can be adjusted according to the first sensing signal and the second sensing signal.

Description

Radio energy transmission device and method

The present disclosure relates to a radio energy transmission apparatus and method, and more particularly to a radio energy transmission apparatus and method using a plurality of coils.

Generally speaking, the installation location of the display device should be convenient for the user to watch, but the preferred installation location often does not necessarily have a power outlet available, and may face the problem that the power cord may affect the appearance. As a practical example in daily life, suppose that the TV is scheduled to be placed in the center of the wall, and the power outlet is at the bottom of the wall. In addition to the possibility of using an additional extension cable, the TV's power cord will also face nowhere to hide. .

In order to solve the problem that the aforementioned television is not easily connected to the power socket, the industry has proposed a means of non-contact power supply. However, in the technology of contactless power supply, the TV and the power supply terminal need to be set at precise positions. If the alignment is inaccurate or the position is shifted, the power supply efficiency is greatly reduced, and the transmission power is insufficient.

In view of the above problems, the present invention provides a radio energy transmission apparatus and method, which can adjust power supplied by a plurality of coils in a radio energy transmission apparatus. It can improve the problem of low power supply efficiency when the positioning of the remote device and the wireless power transmission device is inaccurate or the position is shifted.

Embodiments of the present invention provide a radio energy transmission method for providing power to a remote device. In the wireless power transmission method, the first primary coil of the wireless transmission module is first enabled to transmit the first electrical energy to the remote device, and the first primary coil is inductive according to the relative position of the first primary coil and the remote device. An inductive signal. And, the second main coil of the wireless transmission module is enabled to transmit the second electric energy to the remote device, and the second main coil senses the second sensing signal according to the relative position of the second main coil and the remote device. And adjusting the size of the first power and/or the second power according to the first sensing signal and the second sensing signal.

According to another embodiment of the present invention, in the step of adjusting the size of the first power and/or the second power according to the first sensing signal and the second sensing signal, first converting the first sensing signal and the second sensing signal respectively to generate The first value and the second value. Then, the first proportional relationship is calculated based on at least the first value and the second value. Then, according to the first proportional relationship, a plurality of switches of the driving module are controlled. Here, in the step of controlling the switches of the driving module according to the first proportional relationship, the duty ratio of the plurality of switches is changed according to the first proportional relationship to change the first current path or the first The on-time of the two current paths, wherein the first current path is a current path that enables the first main coil, and the second current path is a current path that enables the second main coil. In addition, the switch enable table is further searched according to the first proportional relationship to change the duty ratio of the plurality of switches.

According to an embodiment of the invention, the first sensing signal is separately converted And the step of generating the first value and the second value, and first calculating, in a weighted manner, the voltage signal of the first sensing signal and the current signal of the first sensing signal to generate the first value. And calculating, in a weighted manner, the voltage signals of the second inductive signal and the current signals of the second inductive signal respectively to generate a second value.

In addition, another embodiment of the present invention provides a wireless power transmission device for providing power to a remote device. The wireless power transmission device has a wireless transmission module, a driving module, and a transmission control unit. The wireless transmission module has a first main coil and a second main coil. The first main coil is configured to transmit the first electric energy to the remote device, and the first sensing signal is sensed according to the relative position of the first main coil and the remote device. The second main coil is configured to transmit the second electrical energy to the remote device, and sense the second sensing signal according to the relative position of the second primary coil and the remote device. The driving module is electrically connected to the wireless transmission module to respectively enable the first main coil and the second main coil in the wireless transmission module. The transmission control unit is configured to control the driving module according to the first sensing signal and the second sensing signal to adjust the size of the first power and/or the second power.

According to an embodiment of the invention, the driving module includes first to fourth switches, and the first and second switches are electrically connected to the first main coil for controlling voltages across the first main coil, and the third and fourth switches The second main coil is electrically connected to control the voltage of the second main coil. The transmission control unit further controls the duty ratios of the first to fourth switches according to the first sensing signal and the second sensing signal to adjust the size of the first power and/or the second power.

According to an embodiment of the invention, the transmission control unit has a signal transmission Change unit and signal control unit. The signal conversion unit is electrically connected to the wireless transmission module for respectively converting the first sensing signal and the second sensing signal to generate the first value and the second value. The signal control unit is electrically connected to the signal conversion unit to calculate the first proportional relationship according to at least the first value and the second value, and the signal control unit controls the plurality of switches of the driving module according to the first proportional relationship. Here, the signal control unit changes the duty ratio of the plurality of switches according to the first proportional relationship to change the on time of the first current path or the second current path, wherein the first current path is enabled The current path of the first main coil, and the second current path is a current path that enables the second main coil. In addition, the signal control unit further searches the switch enablement table according to the first proportional relationship to change the duty ratio of the plurality of switches.

According to an embodiment of the invention, the signal conversion unit is further configured to calculate, in a weighted manner, the voltage signal of the first sensing signal and the current signal of the first sensing signal to generate the first value and the second sensing signal respectively. The current signal of the voltage signal and the second sensing signal are weighted to generate a second value.

In summary, the wireless power transmission device and method disclosed in the present invention calculates the proportional relationship of the sensing signals of the plurality of coils by detecting the sensing signals of the plurality of coils in the wireless power transmitting device, thereby determining the ratio according to the ratio The relationship determines the amount of power supplied to the corresponding coil. Thereby, the present invention improves the problem that the power supply efficiency is low when the remote device and the wireless power transmission device are inaccurately aligned or displaced.

The above description of the disclosure and the following description of the embodiments are intended to illustrate and explain the spirit and principles of the invention, and to provide a further explanation of the scope of the invention.

1‧‧‧Radio energy transmission device

10‧‧‧Wireless Transmission Module

102‧‧‧First main coil

104‧‧‧second main coil

12‧‧‧Drive Module

122‧‧‧DC power supply

14‧‧‧Transmission Control Unit

142‧‧‧Signal conversion unit

1422a, 1422b‧‧‧Rectifier

1424a, 1424b‧‧‧ Gain adjuster

1426a, 1426b‧‧‧Adder

144‧‧‧Signal Control Unit

1442‧‧‧ comparator

1444‧‧‧Duty cycle determiner

1446‧‧‧Drive Signal Generator

2‧‧‧ Remote device

202‧‧‧second coil

3‧‧‧Radio energy transmission device

30‧‧‧Wireless Transmission Module

302‧‧‧First main coil

304‧‧‧second main coil

306‧‧‧ Third main coil

32‧‧‧Drive Module

322‧‧‧DC power supply

34‧‧‧Transmission Control Unit

342‧‧‧Signal conversion unit

344‧‧‧Signal Control Unit

C1~C3, CS‧‧‧ capacitor

D1~D3‧‧‧ induction signal

S1~S6‧‧‧ switch

SV _P1 ~ SV _P3 ‧‧‧ voltage signal

Si _P1 ~Si _P3 ‧‧‧current signal

V _C1 ~V _C3 ‧‧‧ Value

V _S1 ~V _S6 ‧‧‧ drive signal

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a functional block diagram of a wireless power transmission device in accordance with an embodiment of the present invention.

2 is a circuit diagram of a wireless power transmission device according to another embodiment of the present invention.

Figure 3A is a functional block diagram of a transmission control unit in accordance with an embodiment of the present invention.

Figure 3B is a functional block diagram of a signal control unit in accordance with an embodiment of the present invention.

3C is a circuit diagram of a signal control unit in accordance with an embodiment of the present invention.

3D is a functional block diagram of a signal control unit in accordance with an embodiment of the present invention.

4A is a schematic diagram of a duty cycle of a driving signal in accordance with an embodiment of the present invention.

4B is a schematic diagram of a duty cycle of a driving signal according to another embodiment of the present invention.

4C is a schematic diagram of a driving signal duty ratio according to another embodiment of the present invention.

Figure 5 is a flow chart of a method of wireless energy transmission in accordance with an embodiment of the present invention.

Figure 6 is a partial flow chart of a method of radio energy transmission in accordance with another embodiment of the present invention.

Figure 7 is a circuit diagram of a wireless power transmission device in accordance with still another embodiment of the present invention.

FIG. 8A is a schematic diagram showing the relative relationship between the first main coil, the second main coil, the third main coil and the sub coil according to an embodiment of the present invention.

8B is a schematic diagram showing the relative relationship between the first main coil, the second main coil, the third main coil and the sub coil according to another embodiment of the present invention.

8C is a schematic diagram showing the relative relationship between the first main coil, the second main coil, the third main coil and the sub coil according to still another embodiment of the present invention.

Figure 9 is a flow chart showing a method of transmitting radio energy according to still another embodiment of the present invention.

The detailed features and advantages of the present invention are described in detail in the embodiments of the present invention, which are to be understood by those skilled in the art and The objects and advantages associated with the present invention can be readily understood by those skilled in the art. The following examples are intended to describe the present invention in further detail, but do not limit the scope of the invention in any way.

Please refer to FIG. 1. FIG. 1 is a functional block diagram of a wireless power transmission device according to an embodiment of the present invention. As shown in FIG. 1, the wireless power transmission device 1 is configured to provide power to the remote device 2, and the spirit of the embodiment is that the wireless power transmission device 1 can actively detect the problem that the remote device 2 is inaccurate. And adjusting the power transmitted to the remote device 2 accordingly. The remote device 2 can be, for example, handheld Communication devices, tablets, televisions or other home appliances.

The wireless power transmission device 1 has a wireless transmission module 10, a drive module 12, and a transmission control unit 14. The wireless transmission module 10 has a first main coil (not shown in FIG. 1) and a second main coil (not shown in FIG. 1). The first main coil and the second main coil are respectively used to transmit the first electric energy. And the second electrical energy to the remote device 2. Here, the wireless transmission module 10 senses a first sensing signal according to the relative position of the first main coil and the remote device 2, and senses a second sensing signal according to the relative position of the second primary coil and the remote device 2.

In practice, the remote device 2 has a secondary coil (not shown in FIG. 1), the first primary coil and the second primary coil are used as the primary side induction coil, and the secondary coil of the distal device 2 is used as The induction coil on the secondary side. That is to say, the electric energy is transmitted from the primary side induction coil to the secondary side induction coil, and the wireless transmission module 10 can directly detect the voltage and current components carried by the own (primary side) induction coil, accordingly Generate an inductive signal.

The driving module 12 is electrically connected to the wireless transmission module 10 for enabling the first primary coil and the second primary coil in the wireless transmission module 10, respectively. In practice, the driving module 12 is configured to selectively conduct energization energy to the first main coil and the second main coil, thereby providing voltage and current to the first main coil and the second main coil. In addition, the transmission control unit 14 is configured to control the driving module 12 according to the first sensing signal and the second sensing signal to adjust the size of the first power and/or the second power. In principle, the transmission control unit 14 calculates the induced magnetic field strength of the primary coil of the first primary coil and the second primary coil to the remote device 2 according to the first sensing signal and the second sensing signal. system. For example, the induced magnetic field strength relationship is determined by applying a coil coupling relationship and a coil mutual inductance relationship. It should be understood by those skilled in the art that the present embodiment will not be described herein.

For the actual circuit configuration, please refer to FIG. 2, which is a circuit diagram of a wireless power transmission device according to another embodiment of the present invention. As shown in the figure, in addition to the first main coil 102 and the second main coil 104, the first main coil 102 can also be connected in series with a tunable capacitor (resonant compensation capacitor) C1, and the second main coil 104. Also connected in series with adjustable capacitor (resonant compensation capacitor) C2. Here, the adjustable capacitors C1 and C2 can of course be electrically connected to the first main coil 102 and the second main coil 104 in parallel, which is not limited in this embodiment.

In the above, the adjustable capacitors C1 and C2 are used to adjust the capacitance value according to the capacitance value CS of the two ends of the secondary coil 202 of the remote device 2 and the inductance value of the secondary coil 202. It will be appreciated by those of ordinary skill in the art that the electromagnetic resonance frequencies of the first primary coil 102, the second primary coil 104, and the secondary coil 202 should be varied by adding adjustable capacitances C1 and C2. Thereby, the first main coil 102 and the second main coil 104 can respectively perform electromagnetic resonance with the secondary coil 202 of the remote device 2 to transmit the first electrical energy and the second electrical energy.

The drive module 12 can include a DC power source 122 and a plurality of switches S1 S S6. In practice, the switches S1 and S2 are electrically connected to the first main coil 102, the switch S3 and the switch S4 are electrically connected to the first main coil 102 and the second main coil 104, and the switches S5 and S6 are electrically connected to the second main coil 104. The switches S1 S S6 can be a switching transistor. Switch S1, switch S2, switch S3 and switch S4 can be used together The voltage across the first main coil 102 is controlled, and the switch S3, the switch S4, the switch S5 and the switch S6 are used together to control the voltage across the second main coil 104. In this embodiment, the switch S1 is connected in series with the switch S2, the switch S3 is connected in series with the switch S4, and the switch S5 is connected in series with the switch S6. One end of the first main coil 102 is electrically coupled between the switch S1 and the switch S2, and the first main coil is The other end of the 102 is electrically coupled between the switch S3 and the switch S4. One end of the second main coil 104 is electrically coupled between the switch S5 and the switch S6, and the other end of the second main coil 104 is electrically coupled between the switch S3 and the switch S4. In one example, the drive module 12 is an inverter for adjusting the voltage output to the first main coil 102 and the second main coil 104.

From a practical point of view, first, the wireless transmission module 10 senses a first sensing signal according to the relative position of the first primary coil 102 and the secondary coil 202 of the remote device 2 (for example, includes a voltage signal SV _P1). Similarly to the current signal Si _P1 ), the wireless transmission module 10 senses a second sensing signal according to the relative position of the second primary coil 104 and the secondary coil 202 of the remote device 2 (for example, including the voltage signal SV). _P2 and current signal Si _P2 ). Then, the transmission control unit 14 analyzes the first sensing signal and the second sensing signal, thereby controlling the duty ratios of the switches S1 to S6 to adjust the magnitude of the first power and/or the second power. The voltage signal SV _P1 is associated with the voltage across the first main coil 102, and the current signal Si _P1 is associated with the current flowing through the first main coil 102. That is, the voltage of the first inductive signal can be used as the voltage signal SV _P1 and the current of the first inductive signal can be used as the current signal Si _P1 , and the voltage signal SV _{P2 is} similar to the current signal Si _P2 .

For example, the transmission control unit 14 can be further divided into a signal conversion unit 142 and a signal control unit 144. Referring to FIG. 2 and FIG. 3A together, FIG. 3A is a transmission control unit according to an embodiment of the present invention. Functional block diagram. As shown, the transmission control unit 14 has a signal conversion unit 142 and a signal control unit 144 that are electrically connected to each other. The signal conversion unit 142 can respectively convert the first sensing signals (such as the voltage signal SV _P1 and the current signal Si _P1 ) and the first two sensing signal (e.g. SV _P2-voltage signal and the current signal Si _P2), to generate a first value and second value SV _C1 SV _C2. In one example, the signal conversion unit 142 is further configured to calculate the voltage signal SV _P1 and the current signal Si _P1 of the first sensing signal in a weighted manner to generate a first value V _C1 . The signal conversion unit 142 is further configured to calculate the voltage signal SV _P1 and the current signal Si _P1 of the first sensing signal in a weighted manner to generate a first value V _C1 . In the same way, the signal conversion unit 142 similarly processes the voltage signal SV _P2 and the current signal Si _P2 of the second inductive signal to generate the second value V _C2 .

For a practical example, please refer to FIG. 3B. FIG. 3B is a functional block diagram of a signal control unit according to an embodiment of the present invention. As shown in FIG. 3B, the signal conversion unit 142 may have rectifiers 1422a and 1422b, gain adjusters 1424a and 1424b, and adders 1426a and 1426b. In this embodiment, a set of rectifiers 1422a, a gain adjuster 1424a and an adder 1426a are taken as an example. The set of rectifiers 1422a, the gain adjusters 1424a and the adders 1426a are configured to receive the voltage signals SV _P1 and the current signals Si _P1 to calculate The first value is V _C1 . Of course, another set of rectifiers 1422b, gain adjusters 1424b and adders 1426b are used to receive the voltage signal SV _P2 and the current signal Si _P2 to calculate the second value V _C2 .

In practice, the circuit of the rectifier 1422a, the gain adjuster 1424a, and the adder 1426a of one of the groups is implemented as in the example of FIG. 3C, but the invention is not limited thereto. Please refer to FIG. 3C. FIG. 3C is a circuit diagram of a signal control unit according to an embodiment of the present invention. As shown in FIG. 3C, the rectifier 1422a can be, for example, a rectifying diode, which respectively rectifies the input voltage signal SV _P1 and the current signal Si _P1 , and the rectified voltage signal V _P1 and the current signal i _P1 correspond to each other. A voltage value. The gain adjuster 1424a can have resistors R1~R4 and amplifiers OP1~OP2. By designing the resistance values of the resistors R1~R4, the voltage signal SV _P1 (corresponding voltage value) and the current signal Si _P1 can be changed respectively. The gain ratio of the corresponding voltage value is not described in this embodiment. In addition, the adder 1426a may have resistors R5 R R8 and an amplifier OP3 for receiving the output of the gain adjuster 1424a (ie, the amplified voltage values of the amplifiers OP1 to OP2), and adding the first value V _C1 as described above.

Of course, the rectifier 1422b, the gain adjuster 1424b and the adder 1426b of the other group of the signal conversion unit 142 can also be designed with the foregoing circuit to calculate the voltage signal V _P2 and the current signal i _P2 of the second inductive signal in a weighted manner. In order to generate the second value V _C2 , the embodiment will not be described herein. After obtaining the first value V _C1 and the second value V _C2 , the signal control unit 144 calculates the driving signals V _S1 VV _S6 according to the first value V _C1 and the second value V _C2 , and the driving signals V _S1 VV _S6 are respectively It is used to control whether the switch S1 to the switch S6 are turned on or off.

For a practical example, please refer to FIG. 3D, which is a functional block diagram of a signal control unit according to an embodiment of the present invention. As shown in FIG. 3D, the signal control unit 144 can have a comparator 1442, a duty ratio determiner 1444, and a drive signal generator 1446. In practice, the comparator 1442 receives the first value V _C1 and the second value V _C2 and calculates a first proportional relationship, so that the duty ratio determiner 1444 can change the duty of the switch S1 to the switch S6 according to the first proportional relationship. The duty ratio is used to change the on-time of the current path that enables the first main coil 102, or to change the on-time of the current path that enables the second main winding 104. The driving signal generator 1446 can control whether the switches S1 to S6 in the driving module 12 are turned on or off according to the judgment result of the duty ratio determiner 1444. Here, the first directly proportional relationship is a proportional relationship between the second value than the first value V _C2 V _C1, or they may be based on the first value and second value V _C1 and V _C2 ratio to be modified relationship.

In detail, the first main coil 102 and the second main coil 104 are respectively controlled by the driving voltage (that is, the voltage across the first and second main coils), and the voltage waveform of the driving voltage is turned on (including forward conduction and negative). The longer the guide, the greater the power delivered. In addition, the duty ratio determiner 1444 can further search a pre-stored switch enablement table according to the first proportional relationship, and change the duty ratio of the switches S1 to S4 in a manner of looking up the table. When the transmission control unit 14 supplies the driving signal to the switch S1 to the switch S6, and the control switch S1 to the switch S6 are sequentially switched on and off, respectively, the corresponding voltage is supplied to the first main coil 102 and the second main coil 104. In other words, the transmission control unit 14 can adjust the output power of each of the primary side induction coils (the first main coil 102 and the second main coil 104) by controlling the switches S1 to S6. Here, the embodiment does not limit the nature of the driving signal, such as driving The signal may be a drive signal with variable timing, variable on-time and/or variable frequency.

In one example, if the wireless power transmitting device 1 and the remote device 2 have no problem of misalignment, the first proportional relationship should indicate that the distance between the first primary coil 102 and the secondary coil 202 of the remote device 2 is the same as the first The distance between the two primary coils 104 and the secondary coils 202 of the distal device 2. At this time, the transmission control unit 14 controls one or more of the switches S1 to S4 in the drive module 12, respectively, such that the output powers of the first main coil 102 and the second main coil 104 are equal. Please refer to FIG. 4A. FIG. 4A is a schematic diagram of the driving signal duty ratio according to an embodiment of the present invention. As shown in FIG. 4A, when the first main coil 102 and the second main coil 104 are equidistant from the sub coil 202, the signal control unit 144 can control the duty ratio of the driving signals V _S1 VV _S6 such that the first main coil 102 The voltage across the voltage (V _d1 ) corresponds to the on-time T1, and the voltage across the second main coil 104 (V _d2 ) corresponds to the on-time T ₂ , and the on-time T ₁ is equal to the on-time T ₂ .

In practice, the switch S1 and the switch S2 are not substantially simultaneously turned on, and the switch S3 and the switch S4 are not substantially simultaneously turned on, and the switch S5 and the switch S6 are not substantially turned on at the same time. For example, when switch S1 is turned on and switch S4 and/or switch S6 are turned on, the voltage across voltage V _d1 will be greater than zero. When the switch S1 and the switch S3 are turned on, the voltage across the voltage V _d1 is equal to zero. When the switch S2 is turned on and the switch S3 and/or the switch S5 are turned on, the voltage across the voltage V _d1 is less than zero. When the switch S5 is turned on and the switch S2 and/or the switch S4 are turned on, the voltage across the voltage V _d2 is less than zero. When the switch S5 and the switch S3 are turned on, the voltage across the voltage V _d2 is equal to zero. When the switch S6 is turned on and the switch S1 and/or the switch S3 are turned on, the voltage across the voltage V _d2 is greater than zero. In short, the relationship between the conduction of the switch S1 to the switch S6 and the cross-over voltage V _d1 and the cross-pressure V _d2 can be summarized as the following one. Therefore, the signal control unit 144 can control the conduction of the switch S1 to the switch S6 (or even adjust the duty ratio) according to the following table at any time point, thereby adjusting the voltage values of the voltage across the voltage V _d1 and the voltage across the voltage V _d2 . Waveform.

On the contrary, if the wireless power transmission device 1 and the remote device 2 have a problem of inaccurate alignment, for example, the first proportional relationship indicates that the first primary coil 102 and the secondary coil 202 of the remote device 2 are relatively close to each other, in other words, The secondary coil 202 of the remote device 2 is coupled to the magnetic field generated by the first primary coil 102, and the transmission control unit 14 can control the second primary coil 104 and the secondary coil 202 of the remote device 2 at a relatively long position. A primary coil 102 provides more power (or outputs more power) to the secondary coil 202 of the remote unit 2. Please refer to FIG. 4B. FIG. 4B is a schematic diagram of the driving signal duty ratio according to another embodiment of the present invention. As shown in FIG. 4B, when the first main coil 102 is closer to the sub coil 202 than the second main coil 104, the signal control unit 144 controls the driving signal V _S1 ~ V _S6 duty ratio of the ON period T ₃ is greater than the conduction Time T ₄ .

On the other hand, if the relative position of the first main coil 102 and the secondary coil 202 of the remote device 2 is relatively far, that is, the coupling between the secondary coil 202 of the remote device 2 and the magnetic field generated by the second primary coil 104 is better, the transmission control Unit 14 may control second main coil 104 to provide more power (or output greater power) to secondary coil 202 of remote unit 2. Please refer to FIG. 4C, which is a schematic diagram of the driving signal duty ratio according to another embodiment of the present invention. As shown in FIG. 4C, when the second main coil 104 is closer to the sub-coil 202 than the first main coil 102, the signal control unit 144 controls the duty ratio of the driving signals V _S1 VV _S6 so that the on-time T _{6 is} greater than the conduction. Time T ₅ .

Therefore, the radio energy transmission device 1 of the present embodiment selects a more accurate alignment primary side induction coil (for example, the first main coil 102 or the second main coil 104 that is closer to the sub coil 202) and makes Higher power is transmitted so that power can be transmitted to the remote unit 2 more efficiently.

In order to make the radio energy transmission device of the present invention easier to understand, the following description will be made in conjunction with the radio energy transmission method of the present invention. Please refer to 2 and 5, FIG. 5 is a flow chart of a wireless power transmission method according to an embodiment of the present invention. As shown in the figure, in step S40, the driving module 12 enables the first main coil 102 of the wireless transmission module 10 to transmit the first electric energy to the remote device 2, and the first main coil 102 is based on the first main coil 102. The relative position of the remote device 2 senses a first sensing signal. In step S42, the driving module 12 enables the second main coil 104 of the wireless transmission module 10 to transmit the second electric energy to the remote device 2, and the second main coil 104 is according to the second main coil 104 and the remote device 2 The relative position sensing has a second sensing signal. Then, in step S44, the transmission control unit 14 controls the driving module 12 according to the first sensing signal and the second sensing signal to adjust the size of the first power and/or the second power. Please note that the steps S40 and S42 are not in the order of the order, and the embodiment is not limited herein.

Furthermore, in order to make the transmission control unit of the present invention easier to understand, the following describes the radio energy transmission method associated with the transmission control unit. Please refer to FIG. 2, FIG. 3A and FIG. 6 together. FIG. 6 is a partial flow chart of a radio energy transmission method according to another embodiment of the present invention. As shown in the figure, in step S442, the signal conversion unit 142 converts the first sensing signal and the second sensing signal to generate a first value V _C1 and a second value V _C2 . Next, in step S444, the signal control unit 144 calculates the first proportional relationship based on at least the first value V _C1 and the second value V _C2 . Finally, in step S446, the signal control unit 144 further controls the plurality of switches S1 S S4 of the driving module 12 according to the first proportional relationship.

Although FIG. 2 illustrates two primary side induction coils (the first primary coil 102 and the second primary coil 104), the present invention does not actually limit the primary side sensing line. For example, there may be three primary side induction coils, and the drive module is a three-phase inverter. Furthermore, the drive module is not only suitable for three-phase converter architecture, but also for inverter applications of n-phase converters or other deformed architectures. Please refer to FIG. 7. FIG. 7 is a circuit diagram of a wireless power transmission device according to still another embodiment of the present invention. As shown, the wireless power transmission device 3 also has a wireless transmission module 30, a drive module 32, and a transmission control unit 34. However, the wireless transmission module 30 has a third main coil 306 in addition to the first main coil 302 and the second main coil 304. Of course, the first main coil 302, the second main coil 304, and the third main coil 306 can be connected in series to the adjustable capacitors C1 C C3, respectively. The descriptions of the adjustable capacitors C1 C C3 are the same as those in FIG. 2 , and the embodiment is here. Do not repeat them.

Compared with the example of FIG. 2, since the wireless transmission module 30 has the third main coil 306, the drive module 32 should of course have more switches to control the first main coil 302, the second main coil 304 and the third main. Coil 306. Here, the driving module 32 has switches S1 S S6, the switches S1 and S2 are electrically connected to the first main coil 302, the switches S3 and S4 are electrically connected to the second main coil 304, and the switches S5 and S6 are electrically connected to the third main coil. 306. The switches S1 S S6 can all be switching transistors. In other words, switches S1 and S2 are used to control the voltage across the first main winding 302, switches S3 and S4 are used to control the voltage across the second main winding 304, and switches S5 and S6 are used to control the third main winding. The voltage across 306. In the embodiment, the driving module 32 is a three-phase inverter for adjusting the voltages output to the first main coil 302, the second main coil 304, and the third main coil 306.

When the wireless power transmitting device 3 wants to transmit power to the remote device 2, as in the example of FIG. 2, each of the primary side induction coils (the first primary coil 302, the second primary coil 304, and the third primary coil 306) The first sensing signal (including the voltage signal V _P1 and the current signal i _P1 ), the second sensing signal (including the voltage signal V _P2 and the current signal i _P2 ) and the third sensing signal (including the voltage) are respectively detected. Signal V _P3 and current signal i _P3 ). The signal conversion unit 342 of the transmission control unit 34 calculates the first value V _C1 , the second value V _C2 and the third value V _C3 according to the first sensing signal, the second sensing signal and the third sensing signal, respectively. The signal control unit 344 in the transmission control unit 34 can calculate the second proportional relationship according to the first value V _C1 , the second value V _C2 and the third value V _C3 , and the second proportional relationship can be directly the first value V. _{C1 is} proportional to the ratio of the second value V _C2 to the third value V _C3 , or may be a proportional relationship modified based on the first value V _C1 , the second value V _{C2 ,} and the third value V _C3 .

Similarly, after calculating the second proportional relationship, the signal control unit 344 can change the duty ratio of the switches S1 S S6 according to the second proportional relationship to change the enabling of the first main coil 302 and the second main coil. The conduction time of the current path of 304 or third main winding 306. Of course, the signal control unit 344 can further find the switch enablement table according to the second proportional relationship, and change the duty ratio of the switches S1 S S6 in a manner of looking up the table, thereby adjusting each primary side induction coil (the first main coil 302, The output power of the second main coil 304 and the third main coil 306).

In one example, if the first value V _C1 , the second value V _{C2 ,} and the third value V _C3 are 5, 2.5, and 2.5, respectively, the signal control unit 344 controls the duty ratio of the corresponding switch of the first main coil 302 to be 80%, the duty ratio of the second and third main coils 304, 306 corresponding to the switch is 40%. In another example, if the first value V _C1 , the second value V _{C2 ,} and the third value V _C3 are 4.5, 2.5, and 2, respectively, the signal control unit 344 controls the duty ratio of the corresponding switch of the first main coil 302. At 70%, the duty ratio of the second main coil 304 corresponding to the switch is 39%, and the duty ratio of the third main coil 306 corresponding to the switch is 31%. In still another example, if the first value V _C1 , the second value V _{C2 ,} and the third value V _C3 are 4, 1, and 2, respectively, the signal control unit 344 controls the duty ratio of the corresponding switch of the first main coil 302. At 60%, the duty ratio of the second main coil 304 corresponding to the switch is 15%, and the duty ratio of the third main coil 306 corresponding to the switch is 30%.

Please note that in the above plurality of examples, the signal control unit 344 uses the first value V _C1 as a reference, and after setting the duty ratio of the corresponding switch of the first main coil 302, refer to the second value V _C2 and the first The three values V _C3 are respectively compared with the ratio of the first value V _C1 , and the duty ratios of the switches corresponding to the second and third main coils 304 and 306 are set. Of course, the signal control unit 344 can use the maximum value (or the coil corresponding to the maximum output power) corresponding to the maximum value between the first value V _C1 , the second value V _C2 and the third value V _C3 as the reference reference. The reference to the minimum or intermediate value is used as a reference, and the embodiment is not limited.

From a practical point of view, the first main coil 302, the second main coil 304, and the third main coil 306 may be arranged in a triangle (arbitrary triangle or equilateral triangle) on the same plane in the wireless transmission module 30. Preferably, they may be arranged on the circumferential edge of a virtual circle, respectively, and the distance between any two main coils is equal (orthogonal triangle). When the wireless power transmission device 3 is installed, if the center of the virtual circle is previously aligned with the remote device 2, it will contribute to the wireless power transmission device 3. Power is transmitted to the remote unit 2. However, even if the remote device 2 fails to face the center of the virtual circle, or the remote device 2 is even outside the virtual circle, the wireless power transmission device 3 can detect the first sensing signal by the foregoing The second sensing signal and the third sensing signal calculate a second proportional relationship, and adjust the output power of each primary side induction coil (the first main coil 302, the second main coil 304, and the third main coil 306) to be most efficient. The way to transmit power to the remote unit 2.

Please refer to FIG. 8A. FIG. 8A is a schematic diagram showing the relative relationship between the first main coil, the second main coil, the third main coil and the sub coil according to an embodiment of the present invention. As shown in FIG. 8A, when the sub-coil 202 is equidistant from the first main coil 302, the second main coil 304, and the third main coil 306, the driving signals V _S1 to V _S2 , the driving signals V _S3 to V _S4 , and the driving are driven. The duty ratios of the signals V _S5 to V _S6 are equal, so that the first main coil 302, the second main coil 304, and the third main coil 306 have the same on-time.

However, when the remote device 2 is set to be skewed, please refer to FIGS. 8B and 8C, and FIG. 8B is a view of the first main coil, the second main coil, the third main coil and the secondary coil according to another embodiment of the present invention. FIG. 8C is a schematic diagram showing the relative relationship between the first main coil, the second main coil, the third main coil and the sub coil according to still another embodiment of the present invention. As shown in FIG. 8B, when the first main coil 302 is closer to the sub-coil 202 than the second main coil 304 and the third main coil 306, that is, the magnetic field generated by the sub-coil 202 and the first main coil 302 of the remote device 2 The coupling is better. At this time, the duty ratios of the driving signals V _S1 VV _S2 should be given a larger value, so that the first main coil 302 should be longer than the second main coil 304 and the third main coil 306. On time. On the other hand, if the magnetic field coupling between the secondary coil 202 and the second primary coil 304 of the remote device 2 is better as shown in FIG. 8C, the duty ratio of the driving signals V _S3 to V _S4 should be given at this time. The large value causes the second main winding 304 to have a longer on-time than the first main coil 302 and the third main winding 306.

In order to make the radio energy transmission device of Fig. 7 easier to understand, the following description will be made with the radio energy transmission method of the present invention. Please refer to FIG. 7 and FIG. 9 together. FIG. 9 is a flowchart of a radio energy transmission method according to still another embodiment of the present invention. As shown in the figure, in step S50, the driving module 32 enables the first main coil 302 of the wireless transmission module 30 to transmit the first electric energy to the remote device 2, and the first main coil 302 is based on the first main coil 302. The relative position of the remote device 2 senses a first sensing signal D1. In step S52, the driving module 32 enables the second main coil 304 of the wireless transmission module 30 to transmit the second electric energy to the remote device 2, and the second main coil 304 is based on the second main coil 304 and the remote device 2 The relative position sensing has a second sensing signal D2. In step S54, the driving module 32 enables the third main coil 306 of the wireless transmission module 30 to transmit the third electrical energy to the remote device 2, and the third primary coil 306 is based on the third primary coil 306 and the remote device 2 The relative position sensing has a third sensing signal D3. Then, in step S56, the transmission control unit 34 controls the driving module 12 according to the first sensing signal D1, the second sensing signal D2, and the third sensing signal D3 to adjust the first power, the second power, and/or the third power. the size of. Please note that the steps S50-S54 are not in the order of the sequence, and the embodiment is not limited herein.

In summary, the wireless power transmission device and method disclosed in the present invention are calculated by detecting the sensing signals of multiple coils in the wireless power transmission device. The proportional relationship of the sensing signals of the plurality of coils, thereby determining the amount of power supplied to the corresponding coils according to the proportional relationship. Thereby, the present invention can improve the inaccuracy or position of the remote device and the wireless power transmission device regardless of whether the relative position of the remote device is the center point of the plurality of coils in the wireless power transmission device or deviates from the plurality of coils. When the offset is applied, the power supply efficiency is low.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. The modifications and refinements of the present invention are within the scope of the patent protection of the present invention without departing from the spirit and scope of the invention. Please refer to the attached patent application for the scope of protection defined by the present invention.

1‧‧‧Radio energy transmission device

10‧‧‧Wireless Transmission Module

102‧‧‧First main coil

104‧‧‧second main coil

12‧‧‧Drive Module

122‧‧‧DC power supply

14‧‧‧Transmission Control Unit

142‧‧‧Signal conversion unit

Sv _p1 ~Sv _p2 ‧‧‧ voltage signal

Si _p1 ~Si _p2 ‧‧‧current signal

144‧‧‧Signal Control Unit

2‧‧‧ Remote device

202‧‧‧second coil

C1~C3, CS‧‧‧ capacitor

S1~S6‧‧‧ switch

V _d1 ~V _d2 ‧‧‧cross pressure

V _C1 ~V _C2 ‧‧‧ Value

Claims (17)

A radio energy transmission method for providing power to a remote device, the radio energy transmission method comprising: enabling a first primary coil in a wireless transmission module to transmit a first electrical energy to the remote device, The first main coil senses a first sensing signal according to the relative position of the first main coil and the remote device; and enables a second main coil of the wireless transmission module to transmit a second electrical energy to the remote device. The second primary coil senses a second sensing signal according to the relative position of the second primary coil and the remote device; and adjusts the first electrical energy and/or the second according to the first sensing signal and the second sensing signal. The size of the electrical energy. The radio energy transmission method of claim 1, wherein the step of adjusting the size of the first power and/or the second power according to the first sensing signal and the second sensing signal comprises: converting the first Sensing the signal and the second sensing signal to generate a first value and a second value; calculating a first proportional relationship based on the first value and the second value; and controlling the first one according to the first proportional relationship Drive multiple switches of the module. The radio energy transmission method of claim 2, wherein the step of controlling the switches of the driving module according to the first proportional relationship comprises: changing a duty ratio of the switches according to the first proportional relationship ( Duty ratio) to change an on-time of a first current path or a second current path, wherein the first current path is a current path enabling the first main coil, and the second current path is enabling the second The current path of the main coil. The radio energy transmission method of claim 3, wherein a switch enablement table is searched according to the first proportional relationship to change a duty ratio of the switches. The radio energy transmission method of claim 2, wherein the step of separately converting the first inductive signal and the second inductive signal to generate the first value and the second value comprises: separately respectively The voltage signal of the inductive signal and the current signal of the first inductive signal are calculated in a weighted manner to generate the first value; and the voltage signals of the second inductive signal and the current signal of the second inductive signal are respectively calculated in a weighted manner To generate the second value. The radio energy transmission method of claim 1, wherein adjusting the size of the first power and/or the second power according to the first sensing signal and the second sensing signal comprises: when the remote device is closer to the first The first electrical energy is increased when the primary coil is further away from the second primary coil. The method of claim 1, further comprising: enabling a third primary coil of the wireless transmission module to transmit a third electrical energy to the remote device, the third primary coil according to the third primary The third sensor signal is sensed by the relative position of the coil and the remote device; and the first power, the second power, and/or the second sensor are adjusted according to the first sensing signal, the second sensing signal, and the third sensing signal The size of three electrical energy. A wireless power transmission device for providing power to a remote device, the wireless power transmission device comprising: a wireless transmission module, comprising: a first primary coil for transmitting a first electrical energy to the remote device And sensing a first sensing signal according to the relative position of the first main coil and the remote device; a second main coil for transmitting a second electric energy to the remote device, and sensing a second sensing signal according to the relative position of the second main coil and the remote device; a driving module electrically connecting the a wireless transmission module, the driving module is configured to respectively enable the first main coil and the second main coil of the wireless transmission module; and a transmission control unit for relieving the first sensing signal and the second The sensing signal controls the driving module to adjust the size of the first power and/or the second power. The radio energy transmission device of claim 8, wherein the driving module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch, the a switch and the second switch are electrically connected to one end of the first main coil, the third switch and the fourth switch are electrically connected to the other end of the first main coil and one end of the second main coil, the fifth The switch and the sixth switch are electrically connected to the other end of the second main coil for controlling the voltages of the first main coil and the second main coil. The transmission control unit is further configured to use the first sensing signal and the The second sensing signal controls a duty ratio of the first switch to the sixth switch to adjust a size of the first power and/or the second power. The radio energy transmission device of claim 8, wherein the transmission control unit comprises: a signal conversion unit electrically connected to the wireless transmission module, wherein the signal conversion unit is configured to separately convert the first sensing signal and the second Sensing the signal to generate a first value and a second value; and a signal control unit electrically connected to the signal conversion unit, the signal control unit calculating a first ratio according to the first value and the second value The signal control unit is configured to control the plurality of switches of the driving module according to the first proportional relationship. The radio energy transmission device of claim 10, wherein the signal control unit is further configured to a proportional relationship changing a duty ratio of the switches to change an on time of a first current path or a second current path, wherein the first current path is a current path enabling the first main winding The second current path is a current path that enables the second main winding. The radio energy transmission device of claim 11, wherein the signal control unit is further configured to search a switch enablement table according to the first proportional relationship to change a duty ratio of the switches. The radio energy transmission device of claim 10, wherein the signal conversion unit is further configured to calculate the voltage signal of the first inductive signal and the current signal of the first inductive signal in a weighted manner to generate the first value. And calculating the current signal of the second inductive signal and the current signal of the second inductive signal in a weighted manner to generate the second value. The radio energy transmission device of claim 8, wherein the wireless transmission module further comprises an adjustable capacitor electrically coupled to the first main coil, the at least one adjustable capacitor being used according to the remote device The capacitance value of the two ends of the secondary coil and the inductance value of the secondary coil are adjusted to change the electromagnetic resonance frequency of the first primary coil and the secondary coil, and the first primary coil is further used to respectively The secondary coil of the end device is electromagnetically modulated to transmit the first electrical energy. The wireless power transmission device of claim 8, wherein the wireless transmission module further comprises a third primary coil for transmitting a third electrical energy to the remote device, and according to the third primary coil and the distal end The third position of the wireless transmission module is further configured to enable the third primary coil of the wireless transmission module, and the transmission control unit is further configured to: according to the first sensing signal and the second sensing signal And the third sensing signal controls the driving module to adjust the size of the first power, the second power, and/or the third power. The radio energy transmission device of claim 15, wherein the driving module comprises a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch, wherein the Opened The second switch is electrically connected to one end of the first main coil and one end of the third main coil, and the third switch and the fourth switch are electrically connected to the other end of the first main coil and the second main One end of the coil, the fifth switch and the sixth switch are electrically connected to the other end of the second main coil and the other end of the third main coil for controlling the first main coil, the second main coil, and the a voltage across the third main coil; the transmission control unit is further configured to control the driving module to adjust the first electric energy and the second electric energy according to the first sensing signal, the second sensing signal and the third sensing signal The size of the third electrical energy includes the transmission control unit controlling the duty ratio of the first switch to the sixth switch according to the first sensing signal and the second sensing signal, so that the first switch, the third At least two of the switch and the fifth switch have different on-times to adjust the magnitude of the first electrical energy, the second electrical energy, and/or the third electrical energy. The radio energy transmission device of claim 15, wherein the first main coil, the second main coil, and the third main coil are arranged in a triangular shape and an equilateral triangle shape in the wireless transmission module, or Positioning the first main coil, the second main coil, and the third main coil in the wireless transmission module according to a circumference of a circle.