CN110890793A - Wireless power transmission unit - Google Patents
Wireless power transmission unit Download PDFInfo
- Publication number
- CN110890793A CN110890793A CN201811050024.2A CN201811050024A CN110890793A CN 110890793 A CN110890793 A CN 110890793A CN 201811050024 A CN201811050024 A CN 201811050024A CN 110890793 A CN110890793 A CN 110890793A
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- China
- Prior art keywords
- impedance matching
- electrically connected
- wireless power
- optical relay
- unit
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 39
- 230000002457 bidirectional effect Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000005669 field effect Effects 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000006698 induction Effects 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Classifications
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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
- H02J50/50—Circuit arrangements or systems for wireless supply or distribution of electric power using additional energy repeaters between transmitting devices and receiving devices
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
- H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
- H04B5/79—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for data transfer in combination with power transfer
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Power Engineering (AREA)
- Signal Processing (AREA)
- Amplifiers (AREA)
Abstract
The present disclosure relates to a wireless power transmission unit, comprising: a transmitting coil for transmitting energy to a receiving coil of a wireless power receiving unit; an impedance matching network electrically connected to the transmitting coil; a power amplifier electrically connected to the impedance matching network and used for providing an output voltage to the transmitting coil through the impedance matching network; an optical relay electrically connected to the impedance matching network, the impedance matching network and the optical relay for adjusting the impedance matching of the transmitting coil; and a microcontroller electrically connected to the optical relay for controlling the optical relay to adjust the impedance matching of the transmitting coil.
Description
Technical Field
The present disclosure relates to the field of wireless charging, and more particularly, to a wireless power transmission unit.
Background
Wireless charging, also called contactless inductive charging, uses a coil induction method to transfer energy from a Power Transmitting Unit (PTU) to a Power Receiving Unit (PRU), the Power Receiving Unit is installed in an electronic device (device to be charged), and the Power Receiving Unit charges a battery inside the electronic device after Receiving the energy. Because the power transmission unit and the power receiving unit transmit energy in a coil induction mode, a connecting circuit is not needed between the power transmission unit and the power receiving unit, and therefore wireless charging is more convenient than wired charging.
Impedance matching is one of the factors that determine whether wireless charging efficiency is good. In the Power transmission unit, an Impedance Matching Network (IMN) is disposed between a Power Amplifier (PA) and a transmitting coil, and the Impedance matching network is configured to perform Impedance matching between the PA and the transmitting coil, thereby improving charging efficiency. In addition, the power transmission unit further includes a Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) or a transformer electrically connected to the impedance matching network, and the MOSFET or the transformer of the impedance matching network can finely adjust impedance matching, thereby further improving charging efficiency.
However, the circuits of the bidirectional mosfet or the transformer are complicated and are easily burned out. Furthermore, noise flowing through the bidirectional mosfet or the transformer or generated noise easily flows into other devices, which may cause damage to other devices.
There is therefore a need to provide a solution to the above-mentioned problems of the prior art.
Disclosure of Invention
The present disclosure provides a wireless power transmission unit capable of solving the problems in the prior art.
The disclosed wireless power transmission unit includes: a transmitting coil for transmitting energy to a receiving coil of a wireless power receiving unit; an impedance matching network electrically connected to the transmitting coil; a power amplifier electrically connected to the impedance matching network and used for providing an output voltage to the transmitting coil through the impedance matching network; an optical relay electrically connected to the impedance matching network, the impedance matching network and the optical relay for adjusting the impedance matching of the transmitting coil; and a microcontroller electrically connected to the optical relay for controlling the optical relay to adjust the impedance matching of the transmitting coil.
In an embodiment, the wireless power transmission unit further includes a dc power supply unit electrically connected to the power amplifier and the microcontroller, and the dc power supply unit is configured to output a dc voltage to the power amplifier.
In one embodiment, the microcontroller is used for controlling the magnitude of the dc voltage outputted by the dc power supply unit.
In an embodiment, the wireless power transmission unit further includes a pre-driving unit electrically connected to the power amplifier for providing a pre-driving voltage to the power amplifier, and the power amplifier receives the pre-driving voltage and amplifies the pre-driving voltage to generate the output voltage.
In one embodiment, the wireless power transmission unit further comprises a low power bluetooth unit electrically connected to the microcontroller and configured to communicate with the power receiving unit.
In one embodiment, the wireless power transmission unit further includes a sensor set electrically connected to the power amplifier and the microcontroller for sensing the output voltage and an output current of the power amplifier.
In one embodiment, the optical relay is further used to isolate noise flowing to the microcontroller.
In the wireless power transmission unit disclosed by the invention, the circuit structure of the optical relay is simpler than that of the conventional bidirectional metal oxide semiconductor field effect transistor or transformer. Furthermore, the optical relay of the present disclosure can be directly controlled by the microcontroller. Finally, the disclosed optical relay has good isolation function, and the noise generated by the optical relay or the optical relay will not flow into the microcontroller.
In order to make the aforementioned and other aspects of the present disclosure more comprehensible, preferred embodiments accompanied with figures are described in detail below:
drawings
FIG. 1 shows a block diagram of a wireless power transfer unit according to one embodiment of the present disclosure.
Fig. 2 shows a block diagram of a wireless power transfer unit according to another embodiment of the present disclosure.
Detailed Description
Referring to fig. 1, fig. 1 shows a block diagram of a wireless power transmission unit 1 according to an embodiment of the present disclosure.
The wireless power transmission Unit 1 includes a transmitting coil 10, an impedance matching network 12, a power amplifier 14, an optical relay (optical relay)16, and a Micro Control Unit (MCU) 18.
The transmitting coil 10 is used to transmit energy to a receiving coil 50 of a wireless power receiving unit 5. More specifically, the transmitting coil 10 is used for transmitting energy to the receiving coil 50 of the wireless power receiving unit 5 in a magnetic resonance manner for wireless charging.
The impedance matching network 12 is electrically connected to the transmitting coil 10.
The power amplifier 14 is electrically connected to the impedance matching network 12 and is used for providing an output voltage to the transmitting coil 10 through the impedance matching network 12.
One feature of the present disclosure is the provision of the optical relay 16, the optical relay 16 being electrically connected to the impedance matching network 12. The impedance matching network 12 and the optical relay 16 are used to adjust the impedance matching of the transmitting coil 10. More specifically, the impedance matching network 12 can roughly adjust (coarsely adjust) the impedance matching of the transmitting coil 10, and the optical relay 16 can finely adjust (finely adjust) the impedance matching of the transmitting coil 10.
The optical relay 16 of the present disclosure has the following advantages over the prior art using bi-directional mosfets or transformers to fine tune the impedance matching.
First, the circuit structure of the optical relay 16 of the present disclosure is simpler than that of the conventional bidirectional mosfet or transformer. Furthermore, the optical relay 16 of the present disclosure can be directly controlled by the microcontroller 18, and conventional bi-directional mosfets or transformers cannot be directly controlled by the microcontroller 18. Finally, the optical relay 16 of the present disclosure has a good isolation function, and more specifically, the optical relay 16 is further used to isolate the noise flowing to the microcontroller 18, so that the noise generated by the optical relay 16 or the optical relay 16 does not flow into the microcontroller 18, i.e., does not affect the microcontroller 18.
The microcontroller 18 is electrically connected to the optical relay 16 and is used to control the optical relay 16 to finely adjust the impedance matching of the transmitting coil 10.
The wireless power transmission unit 1 further includes a dc power supply unit 20, the dc power supply unit 20 is electrically connected to the power amplifier 14 and the microcontroller 18, and the dc power supply unit 20 is configured to output a dc voltage to the power amplifier 14. The microcontroller 18 can be used to control the magnitude of the dc voltage outputted by the dc power supply unit 20.
The wireless power transmission unit 1 further includes a pre-driving unit 22, wherein the pre-driving unit 22 is electrically connected to the power amplifier 14 and is configured to provide a pre-driving voltage to the power amplifier 14, and the power amplifier 14 receives the pre-driving voltage and amplifies the pre-driving voltage to generate the output voltage.
The wireless power transmission unit 1 further comprises a Bluetooth Low Energy (BLU) unit 24, the Bluetooth Low Energy unit 24 being electrically connected to the microcontroller 18 and configured to communicate with the power receiving unit 5.
Referring to fig. 2, fig. 2 shows a block diagram of a wireless power transmission unit 1' according to another embodiment of the present disclosure.
The difference between the wireless power transmission unit 1 'of the present embodiment and the wireless power transmission unit 1 of fig. 1 is that the wireless power transmission unit 1' of the present embodiment further includes a sensor group 26, and the sensor group 26 is electrically connected to the power amplifier 14, the dc power supply unit 20 and the microcontroller 18 and is used for sensing an output voltage and an output current of the power amplifier 14.
Other components of this embodiment can refer to the related description of fig. 1, and are not described herein.
In the wireless power transmission unit disclosed by the invention, the circuit structure of the optical relay is simpler than that of the conventional bidirectional metal oxide semiconductor field effect transistor or transformer. Furthermore, the optical relay of the present disclosure can be directly controlled by the microcontroller. Finally, the disclosed optical relay has good isolation function, and the noise generated by the optical relay or the optical relay will not flow into the microcontroller.
In summary, although the present disclosure has been described with reference to the preferred embodiments, the above-described preferred embodiments are not intended to limit the present disclosure, and those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, so that the scope of the present disclosure is defined by the appended claims.
Claims (7)
1. A wireless power transfer unit, comprising:
a transmitting coil for transmitting energy to a receiving coil of a wireless power receiving unit;
an impedance matching network electrically connected to the transmitting coil;
a power amplifier electrically connected to the impedance matching network and used for providing an output voltage to the transmitting coil through the impedance matching network;
an optical relay electrically connected to the impedance matching network, the impedance matching network and the optical relay for adjusting the impedance matching of the transmitting coil; and
a microcontroller electrically connected to the optical relay for controlling the optical relay to adjust the impedance matching of the transmitting coil.
2. The wireless power transmission unit of claim 1, further comprising a dc power supply unit electrically connected to the power amplifier and the microcontroller, the dc power supply unit configured to output a dc voltage to the power amplifier.
3. The wireless power transfer unit of claim 2, wherein the microcontroller is configured to control the magnitude of the DC voltage outputted by the DC power supply unit.
4. The wireless power transmission unit of claim 1, further comprising a pre-driver unit electrically connected to the power amplifier for providing a pre-driving voltage to the power amplifier, the power amplifier receiving the pre-driving voltage and amplifying the pre-driving voltage to generate the output voltage.
5. The wireless power transfer unit of claim 1, further comprising a low power Bluetooth unit electrically connected to the microcontroller and configured to communicate with the power receiving unit.
6. The wireless power transfer unit of claim 1, further comprising a sensor set electrically connected to the power amplifier and the microcontroller for sensing the output voltage and an output current of the power amplifier.
7. The wireless power transfer unit of claim 1, wherein the optical relay is further configured to isolate noise flowing to the microcontroller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811050024.2A CN110890793A (en) | 2018-09-10 | 2018-09-10 | Wireless power transmission unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811050024.2A CN110890793A (en) | 2018-09-10 | 2018-09-10 | Wireless power transmission unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110890793A true CN110890793A (en) | 2020-03-17 |
Family
ID=69745026
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811050024.2A Pending CN110890793A (en) | 2018-09-10 | 2018-09-10 | Wireless power transmission unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110890793A (en) |
-
2018
- 2018-09-10 CN CN201811050024.2A patent/CN110890793A/en active Pending
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