WO2012102419A9

WO2012102419A9 - Hardware platform for a multi-node wireless charging base station, and energy transmission unit therefor

Info

Publication number: WO2012102419A9
Application number: PCT/KR2011/000511
Authority: WO
Inventors: 문연국; 임승옥; 원윤재; 김선희; 황규성
Original assignee: 전자부품연구원
Priority date: 2011-01-24
Filing date: 2011-01-25
Publication date: 2012-11-15
Also published as: WO2012102419A1; KR101225089B1; KR20120085498A

Abstract

The present invention relates to a hardware platform for a multi-node wireless charging base station for wirelessly charging a plurality of devices using a magnetic resonance induction method, and to an energy transmission unit therefor. The hardware platform for a multi-node wireless charging base station of the present invention includes: an MCU controlling a main function of the wireless charging base station; a clock generator providing a clock to the MCU; a platform control module including a power control unit for controlling the power of a power-supply source for wireless charging, and a communication control unit; a hardware module combining charging and communication functions, including an optimizing unit for controlling power transmission in an optimized state according to a load, a transmission unit, and a communication unit; and an antenna module including an antenna for transmitting energy wirelessly, and an antenna interface unit for providing an interface between the energy transmission unit and the antenna.

Description

Multi-node wireless charging base station hardware platform and its energy transmitter

The present invention relates to a wireless charging base station hardware platform, and more particularly, to a multi-node wireless charging base station hardware platform capable of wirelessly charging a plurality of devices using a magnetic resonance induction method and an energy transmitter thereof.

As a wireless power transmission technology for wirelessly transmitting energy, a wireless charging system using magnetic induction is used.

For example, electric toothbrushes or wireless shavers are charged with the principle of electromagnetic induction. Recently, wireless charging products for charging mobile devices such as mobile phones, PDAs, MP3 players, and notebook computers using electromagnetic induction have been introduced. .

However, the magnetic induction method of inducing current through a magnetic field from one coil to another is very sensitive to the distance and relative position between the coils, so that the transmission efficiency drops rapidly even if the distance between the two coils is slightly dropped or twisted. Accordingly, this magnetic induction charging system can only be used in a short distance of several cm or less.

On the other hand, US Patent 7,741,735 discloses a non-radiative energy transfer method based on the attenuation wave coupling of the resonant field. This is because two resonators with the same frequency do not affect other non-resonators around them, but they tend to couple with each other and are introduced as a technology that can transfer energy over a long distance compared to conventional electromagnetic induction. .

However, when there are a plurality of receivers in a system for transmitting energy wirelessly using resonance, power is transmitted to all receiver apparatuses where resonance occurs, which is inefficient.

SUMMARY OF THE INVENTION The present invention has been made in view of the above technical background, and provides a self-resonant multi-node wireless charging base station hardware platform capable of providing efficient charging for a plurality of wireless chargers and an energy transmitter thereof. It is a task.

Another object of the present invention is to provide a magnetic resonance-induced multi-node wireless charging base station hardware platform and its energy transmitter capable of efficiently charging a plurality of nodes using magnetic field communication.

In order to solve the above problems, the present invention provides a multi-node wireless charging base station that transmits power in a self-resonance induction manner to a plurality of wireless chargers. The multi-node wireless charging base station according to an aspect of the present invention includes: A platform control module including an MCU for controlling main functions of a wireless charging base station, a clock generator for providing a clock to the MCU, a power control unit for controlling a power source as a power supply for wireless charging, and a communication control unit, A charging communication fusion hardware module including an optimizer for controlling power transmission in an optimized state and an energy transmitter and a communication unit, an antenna interface unit providing an antenna for wirelessly transmitting energy, and an interface between the energy transmitter and the antenna. This includes the antenna module included Eojinda.

Herein, the communication control unit may include a USB / RS-232 / Ethernet communication block providing a USB / RS-232 / Ethernet interface and a magnetic field communication block providing a magnetic field communication interface, and the optimizer includes the wireless charging base. Emission of energy other than wireless power transmitted in a magnetic resonance induction method between the resonance efficiency improving unit for improving the resonance efficiency between the station and the wireless charger to be charged and the wireless charging base station and the wireless charger to be charged It may include an unintentional energy emission minimization unit to minimize the.

Preferably, the energy transmitter includes a plurality of slots connected to a system bus, and the plurality of slots may include a low frequency low power (LF LP) mode, a low frequency high power (LF HP) mode, and a high frequency low HF LP. Power and HF High Frequency High Power (HP) mode slots.

In addition, the LF LP mode slot preferably includes a magnetic field communication block, each of the plurality of slots may include an inverter type or a power amplifier type energy transmission circuit.

The antenna module preferably includes a low frequency (LF) antenna and a high frequency (HF) antenna for dual band transmission.

According to another aspect of the invention, there is provided an energy transmitter of a multi-node wireless charging base station that transmits power in a self-resonant manner to a plurality of wireless chargers, which are configured to be mounted in a plurality of slots connected to a system bus.

According to the present invention, the multi-node wireless charging base station using the magnetic resonance induction method can efficiently charge a plurality of wireless chargers, and can efficiently manage the charging process of the entire multi-node wireless charging system.

1 is a block diagram schematically showing the overall configuration of a multi-node wireless charging system using a magnetic resonance induction method according to an embodiment of the present invention.

2 is a block diagram showing in detail the configuration of a wireless charging base station according to an embodiment of the present invention.

Figure 3 shows the configuration of a wireless charging base station according to an embodiment of the present invention as a functional block.

4 to 8 illustrate a Simulink Model used for system specification analysis and system budget design for a link budget of wireless charging in a wireless charging system according to an embodiment of the present invention.

9 is a block diagram illustrating an energy transmitter of a wireless charging base station according to an embodiment of the present invention.

10 and 11 are block diagrams showing the configuration of the slots shown in FIG. 9, respectively.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but will be implemented in various forms, and only the present embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Meanwhile, the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

Hereinafter, with reference to the accompanying drawings, a multi-node wireless charging system using a magnetic resonance induction method according to an embodiment of the present invention will be described in detail.

As shown in FIG. 1, the multi-node wireless charging system using the magnetic resonance induction method according to an embodiment of the present invention includes a wireless charging base station 10 that wirelessly supplies power through a magnetic resonance induction method, and a wireless charging base. A plurality of wireless chargers 50_1, 50_2,... 50_N, which are located at a predetermined distance from the station 10, and are wirelessly powered from the wireless charging base station 10, are included.

Magnetic resonance induction is a method of maximizing the wireless transmission efficiency of energy by the resonance between the transmitting antenna and the receiving antenna. To this end, a resonance channel is formed by matching a resonance frequency between the wireless charging base station 10 and the wireless chargers 50_1, 50_2,..., 50_N, and transmits wireless power.

The wireless charging base station 10 may communicate with the wireless chargers 50_1, 50_2,..., 50_N through the magnetic field communication, and may include the wireless chargers 50_1, 50_2, including identification information, type, location, or state of charge of the charger. ..., 50_N) may be received, and power may be transmitted to the wireless chargers 50_1, 50_2,..., 50_N based on the charging information.

The wireless charging base station 10 is composed of dual bands (high frequency band and low frequency band) to simultaneously perform magnetic field communication and wireless charging. Low frequency bands are typically used for magnetic field communication and remote charging, while high frequency bands can be used for high efficiency charging. In addition, the low frequency and high frequency bands can be charged using the low power and high power modes, respectively.

Wireless charging base station 10 may be implemented in a fixed or mobile, if the fixed type can be installed indoors, such as the ceiling or table furniture, and in the outdoors can be installed in the form of implants such as bus stops and subway stations The wireless charging base station 10 may be installed inside a moving object such as a vehicle, a train or a subway. When the wireless charging base station 10 is implemented as a mobile, the wireless charging base station 10 itself may be implemented as a separate mobile device, or may be implemented as part of another digital device such as a cover of a notebook computer. .

The wireless chargers 50_1, 50_2, .., 50_N may include all digital devices including batteries such as various mobile terminals, digital cameras, and notebook computers, and are not easily accessible to underground, underwater, and inside buildings. It may also be an electronic device such as a sensor and a measuring instrument.

2 is a block diagram showing in detail the configuration of the wireless charging base station 10 of the multi-node wireless charging system using the magnetic resonance induction method according to an embodiment of the present invention.

As shown in FIG. 2, the wireless charging base station 10 according to the embodiment of the present invention includes a platform control module 100, a charging communication fusion hardware module 200, and an antenna module 300.

The platform control module 100 controls the MCU 120, the clock generator 110, the power controller 140, the analog controller 150, debugging and status monitoring for controlling the main functions of the wireless charging base station 10. A display unit (LCD) 160 and a communication control unit 130. The communication control unit 130 includes a block 132 for providing a USB / RS-232 / Ethernet interface and a block 134 for providing a magnetic field communication interface.

The charging communication fusion hardware module 200 includes an optimizer 210, a communicator 220, and an energy transmitter 230 to provide optimized charging. The optimizer 210 includes a resonance efficiency improver 212 and an unintentional energy emission minimizer 214 to control power transmission in an optimized state according to a load. The communication unit 220 includes analog and

digital modules

222 and 224, and the energy transmitter 230 uses the LF and

HF modules

232 and 234 for efficient charging such as charging distance, energy transmission efficiency and directivity. Include.

The antenna module 300 includes an antenna interface 310 and an antenna 320 that provide an interface between the energy transmitter 230 and the antenna 320 of the charging communication fusion hardware module 200. The antenna interface 310 again includes an impedance matching unit 312 and a magnetic trapper 314, and the antenna 320 includes an LF antenna 322 and an HF antenna 324 for dual band transmission.

Figure 3 shows the configuration of the wireless charging base station 10 of the multi-node wireless charging system using a magnetic resonance induction method according to an embodiment of the present invention as a functional block.

As shown in FIG. 3, the wireless charging base station 10 according to an embodiment of the present invention uses the charging state information of the charger to select the optimal charging mode of the wireless chargers 50_1, 50_2,..., 50_N. It has a functional block to classify and a functional block for controlling the resources set in the hardware by storing and reading the position and status information of the charger.

It also incorporates a bandwidth conversion function and LCR control circuit for optimal magnetic resonance and antenna optimization. LF / HF wireless energy transmission / reception strength, wireless charging channel observation value, location status of charger, charging information and interference information of devices are stored in status register to maintain optimal charging status. The base station of the wireless charging communication convergence system provides simultaneous charging of up to four terminal nodes by minimizing interference of the LF and HF bands.

On the other hand, in order to obtain a desired charging performance in the multi-node wireless charging system using the magnetic resonance induction method according to an embodiment of the present invention, carefully consider the relationship between the frequency band, output control method, output range, matching characteristics, effective charging distance, etc. You must do it.

The power transmitted from the power transmitter, i.e., the wireless charging base station 10, should be controlled in consideration of the reception state and distance of the receiving terminal, i.e., the wireless charger. The calculated transmission power enters the antenna of the wireless charger through the path loss and enters the analog power receiver through the loss of the front end block including the matching block. This signal obtains the reception characteristics of the power receiver in the DC-DC converter through the voltage multiplier and rectifier, and the efficiency characteristic at this time determines the main performance. Stable DC characteristics and characteristics for battery supply are input to the battery through the LDO regulator, charger and battery interface.

In the wireless charging base station of the multi-node wireless charging system using the magnetic resonance induction method according to the embodiment of the present invention, the system specification analysis for the Link Budget of wireless charging and the base station platform using the Matlab Simulink Tool for system budget design It is modeled to perform power transmission function by controlling necessary environmental variables.

4 shows a Simulink Model for Link Budget. 5 shows a Simulink Model of a communication block, and FIG. 6 shows a block diagram of a Simulink block.

Efficiency should be considered in the configuration of the main system block, slot for module interface, power transmission module, data transmission / reception module, matching circuit block, antenna block, and the like. Operation must be guaranteed.

As shown in FIG. 4, in order to receive sufficient power of 4 W or more in the LF / HF power receiver, the power is sensitive to output strength, matching circuit characteristics, and effective charging distance, and the output power of the transmitter is sufficient from 6 W to 20 W. It can be seen that power-control should be achieved. At this time, the loss of the RF-frontend module can represent more than 50% of loss according to each environment variable. Therefore, it is essential to take measurements from the platform and optimize them through sufficient iteration.

7 shows LF Simulink modeling according to environment variables. The loss of the RF-frontend module is set to be variable according to the matching characteristics, and the loss of the Power Loop Control block is assumed to be zero.

8 shows HF Simulink modeling. The faucet parameter can contain all of the unforeseen loss of reception characteristics during actual implementation. However, in order to minimize the difference between the measured value and the simulation, the repeated simulation is performed by receiving the actual measured value as the environmental variable.

Through the Simulink model and the Link Budget, the main specifications of the base station platform needed in the LF band and the HF band are summarized in the following [Table 1].

Table 1

Item	Details	Specification	Remarks
LF band	Frequency range	20 kHz-1 MHz	125 kHz for power transmission
	Output control method	Variable Duty PWM
	Output range	6W-20W	Variable, Slot type
	Power conversion efficiency	> 70%	DC to RF standard
	Effective charging distance	> 0.2m
	Communication modulation	PSK	Magnetic Field Communication Specification
	Communication distance	> 1m
HF band	Frequency range	6 MHz-20 MHz	13.56 MHz for power transmission
	Output control method	Variable duty
	Power conversion efficiency	> 70%	DC to RF standard
	Output range	6W-20W	Variable, Slot type
	Effective charging distance	> 0.2m
Common	External Interface	Ethernet	USB option
	Internal Interface	RS-232	Android-based P / F ↔ Mainboard
	power	24V DC, 5A3.5Φ Jack	10A option
	Motherboard power	24V	Operating power
	Motherboard power	5V, 3.3V	System power
	Module power	24V	Main amplifier power
	Module power	5 V	Peripheral Circuit Power
	OS	Android
	Display	LCD
	Slot number for module	Four
	Output connector	50ohm BNC Femail

As shown in Table 1, the wireless charging base station 10 according to an embodiment of the present invention has a power conversion efficiency of 70% or more when transmitting power of 6W to 20W in the frequency range of 20kHz to 1MHz in the LF band. With this, an effective charging distance of 0.2 m or more can be obtained and the communication transmission distance is 1 m or more. In addition, the HF band has a power conversion efficiency of 70% or more and transmits an effective charging distance of 0.2 m or more when transmitting power of 6W to 20W in the frequency range of 6MHz to 20MHz.

9 is a view showing in more detail the energy transmitter 230 of the wireless charging base station 10 according to an embodiment of the present invention.

The energy transmitter 230 is a block which generates a carrier according to the input data of the input frequency, RF-processes it, and transmits it to the antenna. In the wireless charging base station 10 according to the embodiment of the present invention, the LF power transmission carrier uses a 128 kHz band, and the HF power transmission carrier uses a 13.5 MHz band.

The energy transmitter 230 may be manufactured in a manner of being mounted in a plurality of slots of the main board, and as shown in FIG. 9, a plurality of slots having different bands and output modes may be mounted, and a plurality of slots may be mounted. Slots connect to the system bus.

In FIG. 9, a low frequency low power (LF LP) mode and a magnetic field communication unit are allocated to the first slot 232_1, and a second slot 232_2 is assigned a low frequency high power (LF HP) mode, and a third slot 234_1 The fourth slot 234_2 is assigned an HF LP (High Frequency Low Power) and HF HP (High Frequency High Power) mode, respectively.

The number of such slots is not limited to four, of course, can be reduced or increased as needed.

10 and 11 are block diagrams illustrating the configuration of each slot shown in FIG. 9.

FIG. 10 shows the configuration of the first slot of FIG. 9, and as shown in FIG. 10, an LF LP energy transmission circuit and an impedance matching circuit are included, and a communication module for magnetic field communication and an impedance matching circuit thereof are also included. .

FIG. 11 shows the configuration of the second to fourth slots of FIG. 9, and unlike FIG. 10, only the energy transmission circuit and the impedance matching circuit are included since they are used only for energy transmission.

Meanwhile, although the energy transmission circuit of FIG. 10 is shown as using an inverter method, and the energy transmission circuit of FIG. 11 is shown as using a power amplifier (PA) method, the configuration of the energy transmission circuit is necessarily. It is not necessary to follow the configurations shown in FIGS. 10 and 11, and an inverter method or a power amplifier method may be appropriately selected and used for each slot of the energy transmitter.

Although the present invention has been described above with reference to preferred embodiments, the apparatus and method of the present invention are not necessarily limited to the above-described embodiments, and various modifications and variations can be made without departing from the spirit and scope of the invention. Accordingly, the appended claims will include such modifications and variations as long as they fall within the spirit of the invention.

Claims

A multi-node wireless charging base station hardware platform that transmits power in a self-resonant manner to multiple wireless chargers.

A platform control module including a MCU for controlling main functions of the wireless charging base station, a clock generator for providing a clock to the MCU, a power control unit for controlling a power source that is a power supply source for wireless charging, and a communication control unit;

A charging communication fusion hardware module including an optimizer for controlling power transmission in an optimized state according to a load, an energy transmitter, and a communication unit;

A multi-node wireless charging base station hardware platform comprising an antenna module including an antenna for wirelessly transmitting energy and an antenna interface for providing an interface between the energy transmitter and the antenna.
The method of claim 1, wherein the communication control unit,

Multi-node wireless charging base station hardware platform comprising a USB / RS-232 / Ethernet communication block providing a USB / RS-232 / Ethernet interface and a magnetic field communication block providing a magnetic field communication interface.
The method of claim 1, wherein the optimizer,

Wireless power delivered in a self-resonance induction method between the wireless charging base station and the wireless charging base station and the wireless charging base station to improve the resonant efficiency between the wireless charging base station and the wireless charger to charge A multi-node wireless charging base station hardware platform comprising an unintentional energy release minimizer that minimizes other energy emissions.
The method of claim 1, wherein the energy transmission unit,

Multi-node wireless charging base station hardware platform with multiple slots connected to the system bus.
The method of claim 4, wherein the plurality of slots,

Multi-node wireless charging base station hardware platform with low frequency low power (LF LP) mode, low frequency high power (LF HP) mode, high frequency low power (HF LP), and high frequency high power (HF HP) mode slots .
The method of claim 5, wherein the LF LP mode slot,

A multi-node wireless charging base station hardware platform comprising a magnetic field communication block.
The method of claim 1, wherein each of the plurality of slots,

A multi-node wireless charging base station hardware platform that includes an inverter or power amplifier energy transfer circuit.
The method of claim 1, wherein the antenna module,

Multi-node wireless charging base station hardware platform that includes a low frequency (LF) antenna and a high frequency (HF) antenna for dual band transmission.
An energy transmitter of a multi-node wireless charging base station that transmits power in a magnetic resonance induction manner to a plurality of wireless chargers,

An energy transmitter of a multi-node wireless charging base station configured to be mounted in a plurality of slots connected to a system bus.
The method of claim 9, wherein the plurality of slots,

Energy from a multi-node wireless charging base station that includes low frequency low power (LF LP) mode, low frequency high power (LF HP) mode, high frequency low power (HF LP), and high frequency high power (HF HP) mode slots. Transmission unit.
The method of claim 10, wherein the LF LP mode slot,

An energy transmitter of a multi-node wireless charging base station comprising a magnetic field communication block.
The method of claim 9, wherein each of the plurality of slots,

An energy transmission unit of a multi-node wireless charging base station including an inverter type or a power amplifier type energy transfer circuit.