KR101944387B1 - Method for controlling operation of an antenna both for wireless power transmission and data transmission using magnetic stripe transmission and a device for the same - Google Patents

Abstract

The present invention relates to a user apparatus which comprises: a wireless power receiving antenna including a coil and a first resonance capacitor which is connected in series with the coil; and an antenna driving unit supplying a coil current to the wireless power receiving antenna. Disclosed is the user apparatus which comprises a coil current bypass unit having two terminals individually connected to both ends of the first resonance capacitor. The antenna driving unit 1) maintains a gap between the two terminals to be an open state during a wireless power reception time period for receiving wireless power from the outside through the wireless power receiving antenna and 2) maintains the gap between the two terminals to be a short state during a wireless power transmission time period for transmitting information to the outside through the wireless power receiving antenna.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a control method for a wireless power transmission and an MST data transmission,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control method of an antenna operation installed in a user equipment, and more particularly, to a control method of an antenna commonly used in the implementation of wireless power receiving technology and MST technology.

MST (Magnetic Stripe Transmission) technology is a communication technology that enables financial information inquiry or subscriber information inquiry to be performed in place of the use of a card having a magnetic stripe. Korean Patent Publication No. 10-2016-0075653 and the like are disclosed.

Wireless Power Transmission (WPT) technology is a technology for transmitting and transmitting power through an electromagnetic field, and is a technique for transmitting power using a power transmitting side coil and a power receiving side coil. Korean Patent Publication No. 10-2013-0050782, etc. disclose such contents. Hereinafter, the wireless power transmission may be referred to as wireless power reception or wireless power transmission or wireless power transmission and reception.

The configuration of the MST antenna module suitable for the MST technology and the configuration of the WPT antenna module suitable for the wireless power reception technology are different. Therefore, there is a problem that the MST technique can not be successfully implemented when the MST technique is applied using the WPT antenna module instead of using the antenna suitable for the MST technology.

MST technology and wireless power reception technology can be applied to portable small user equipments. If the MST antenna module for the MST technology and the WPT antenna module for the wireless power reception technology are separately installed in the user equipments, the volume of the user equipments may be increased and the portability may be deteriorated.

Further, even if a modified antenna module made by modifying the WPT antenna module for wireless power receiving technology is developed, there is a problem that the size of the antenna module increases in order to apply it to MST technology and wireless power receiving technology in common.

In the present invention, a control technique capable of realizing the MST technology and the wireless power reception technology by using the WPT antenna module for wireless power reception technology as it is is provided.

According to an aspect of the present invention, a wireless power receiving antenna 20 including a coil Ls and a first resonant capacitor Cs connected in series with the coil; And an antenna driver (10) adapted to provide a coil current (I _coil ) to the antenna for wireless power reception. The user equipment includes a coil current bypass unit (210) having two terminals respectively connected to both ends of the first resonance capacitor, and the antenna driving unit is connected to the first resonance capacitor During an information transmission period in which information is transmitted to the outside through the antenna for receiving the wireless power, the wireless terminal is kept in an open state between the two terminals during a wireless power reception time period for receiving wireless power, Short-state "state.

In this case, the coil current bypass unit includes a bypass switch 211 controlled by the antenna driving unit, and both terminals of the bypass switch are connected to the two terminals, The bypass switch may be turned off during the wireless power reception period, and the bypass switch may be kept on during the information transmission period.

In this case, the bypass switch may be a back-lit switch.

The antenna driving unit includes a switch unit 110 including four transistors M _N1 , M _N2 , M _N3 , and M _N4 that constitute an H-bridge. The switch unit controls the switch unit to operate as a rectifier for rectifying the current supplied from the antenna unit during the power reception time period, and (2) during the information transmission period, the switch unit supplies the coil current To control the switch section to provide the current I _coil .

Alternatively, the antenna driving unit may include a switch unit 110 including four transistors M _N1 , M _N2 , M _N3 , and M _N4 constituting an H-bridge, During the time period, the switch unit is configured to control the switch unit to provide a coil current (I _coil ) to the antenna for receiving the wireless power, and the antenna driver is configured to control at least one of the four transistors among the four information transmission periods The voltage V _GS between the gate and the source of the at least one of the transistors may be increased when the driving voltage VDD of the H-bridge falls in a time period when one transistor is on.

At this time, the battery unit 50; A power control unit 30 for converting the power supplied from the battery unit 50 and providing the converted power to the antenna driving unit; And a switch 71. The antenna driving unit 10 includes a first power terminal T.A1 for providing a rectified current during the wireless power reception time period to the outside of the antenna driving unit, And a second power terminal (T.A2) receiving power from the power control unit (30) during a wireless power transmission time period for providing wireless power to the outside through the wireless power receiving antenna (20), wherein the switch (71) is disposed between a power output terminal of the battery unit (50) and the first power terminal (T.A1), the switch (71) is kept ON only during the information transmission period, During the information transmission period, the power supply from the power control unit 30 to the second power terminal T.A2 may be blocked.

According to one aspect of the present invention, an antenna (not shown) is provided for providing a coil current (I _coil ) to a radio power receiving antenna 20 comprising a coil Ls and a first resonant capacitor Cs connected in series with the _coil The driving IC 10 can be provided. The antenna driving IC is configured to control the operation of the coil current bypassing unit 210 having two terminals respectively connected to both ends of the first resonance capacitor, During an information transmission period in which a cable is transmitted to the outside through the antenna for receiving the wireless power, the two terminals are kept open-circuited during the wireless power reception time period for receiving the wireless power from the terminal May be arranged to keep the terminals between the terminals in a short-state.

 In this case, the coil current bypass unit includes a bypass switch 211 controlled by the antenna driving IC, and both terminals of the bypass switch are connected to the two terminals, The bypass switch may be turned off during the wireless power reception time period, and the bypass switch may be turned on during the information transmission time period.

At this time, the antenna driving IC includes a switch unit 110 including four transistors M _N1 , M _N2 , M _N3 , and M _N4 constituting an H-bridge, The switch unit controls the switch unit to operate as a rectifier for rectifying the current supplied from the antenna unit during the wireless power reception time period, and during the information transmission period, the switch unit controls the switch unit It may be arranged to control the switch section to provide the current I _coil .

Alternatively, the antenna driving IC includes a switch unit 110 including four transistors M _N1 , M _N2 , M _N3 , and M _N4 constituting an H-bridge, Wherein during the information transmission period, the switch section is configured to control the switch section to provide a coil current (I _coil ) to the antenna for receiving the radio power, and the antenna driving section is configured to control the switch section When the drive voltage (VDD) of the H-bridge falls in a time period when at least one of the transistors has an ON state, the voltage (V _GS ) between the gate and the source of the at least one of the transistors have.

At this time, the coil current bypass unit may be included in the antenna driving IC.

According to another aspect of the present invention there is provided an antenna for providing a coil current I _coil to a radio power receiving antenna 20 comprising a coil Ls and a first resonant capacitor Cs connected in series with the _coil . The driving IC 10 can be provided. The antenna driving IC is configured to control the operation of the coil current bypassing unit 210 having two terminals respectively connected to both ends of the first resonance capacitor, The electromagnetic wave transmitting / receiving system for holding the electromagnetic wave transmitting / receiving system for holding the electromagnetic wave transmitting / receiving system for transmitting electromagnetic waves to the outside through the antenna for receiving the wireless power, And may be configured to keep the two terminals short-circuited during the dispatch period.

In this case, the part of the transmission time interval may be a time period for transmitting the coded information to the outside through the antenna for wireless power reception.

According to the present invention, it is possible to provide a control technique that can implement both the MST technology and the wireless power reception technology directly using the WPT antenna module for wireless power reception technology.

FIG. 1A shows a configuration of a user equipment according to an embodiment of the present invention, and FIG. 1B shows a configuration of a user equipment according to another embodiment of the present invention modified from the embodiment shown in FIG. 1A.
Fig. 2 shows a specific configuration of the switch unit shown in Fig.
3 shows an example of the internal structure of the antenna unit shown in FIG.
FIG. 4 is a view for explaining a method of driving two different antenna modes according to an embodiment of the present invention.
5 is a view for explaining a problem that occurs when an operation according to the MST mode is performed using the antenna unit optimized for the wireless power reception technique.
FIG. 6 illustrates an electrical device connected to an antenna unit and an antenna unit during a period when the user equipment shown in FIG. 1 operates in the MST mode.
7 is a diagram illustrating a connection state between an antenna current bypass unit and an antenna unit and an internal configuration of an antenna current bypass unit according to an embodiment of the present invention.
FIG. 8A shows the configuration of the antenna driving unit and the power control unit shown in FIGS. 1A and 1B in more detail, and FIG. 8B shows a main configuration of a user equipment having a modified configuration from FIG. 8A.
Fig. 9 shows an embodiment modified from Figs. 1A and 1B.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein, but may be implemented in various other forms. The terminology used herein is for the purpose of understanding the embodiments and is not intended to limit the scope of the present invention. Also, the singular forms as used below include plural forms unless the phrases expressly have the opposite meaning.

FIG. 1A shows a configuration of a user equipment according to an embodiment of the present invention.

The user device 1 includes an antenna driving unit 10, an antenna unit 20, a power control unit 30, a main control unit 40, a battery unit 50, a USB / OTG terminal 60, (Not shown). The user device 1 may further include a user interface (not shown) and other components. The antenna unit 20 may be the above-described WPT antenna module. In this specification, the antenna unit 20 may be referred to as a wireless power receiving antenna.

The power supply control unit 30 is sometimes referred to as an independent IC with a name PMIC. In one embodiment, one of several commercially available PMICs may be used as the power supply control unit 30. [ In another embodiment, a newly designed circuit using the circuit optimized for the functions of the antenna driving unit 10 and the main control unit 40 may be used as the power supply control unit 30.

The antenna driving unit 10 may be provided as an independent IC as a part for controlling a current provided to the antenna unit 20. [ The antenna driver may be referred to herein as an antenna driver chip.

The antenna driving unit 10 can receive the operation power V _DC from the power control unit 30 and can receive the coil current I _coil supplied to the antenna unit 20 or received from the antenna unit 20 Current terminals AC1 and AC2. The current terminal voltages, which are the voltages of the two current terminals AC1 and AC2, can be expressed as V _AC1 and V _AC2 .

In the MST mode, the antenna driving unit 10 can provide the shaped current to the antenna unit 20 via the two current terminals AC1 and AC2.

In the power transmission mode, the antenna driving unit 10 can provide a current having a specific frequency to the antenna unit 20 through the two current terminals AC1 and AC2.

In the power receiving mode, the antenna driving unit 10 can rectify the power received from the outside via the antenna unit 20 and output the generated rectified voltage V _RECT . The rectified voltage V _RECT may be used for charging the battery.

The antenna driving unit 10 may include a control unit 120 having various control functions including a function of controlling operations of the switch unit 110 and the switch unit 110. [ The switch unit 110 functions to shape the shape of the coil current I _coil to be provided to the antenna unit 20 in the MST mode (= first operation mode), and the power reception mode (= Mode), it is possible to rectify the power flowing from the antenna to generate a rectified voltage V _RECT . The operation of the switch unit 110 can be controlled by the switch control voltages V _G1 , V _G2 , V _G3 , and V _G4 provided from the control unit 120.

When the switches included in the switch unit 110 are FETs, the switch control voltage may be a gate voltage of the FETs.

The antenna section 20 may be a device including a coil capable of generating an electromagnetic wave or generating an inductive current by an electromagnetic wave from the outside. In one embodiment of the present invention, the antenna portion 20 may be a circuit optimized for wireless power transmission. An antenna device optimized for wireless power transmission may be designed with a circuit having a resonant frequency for improved efficiency and may include a capacitor connected in series or in parallel with the coil.

The power supply control unit 30 can generate the system voltage necessary for the user equipment 1 by using the battery voltage V _BAT provided from the battery unit 50. [ The system voltage may be a single level voltage or a plurality of voltages at multiple levels. The system voltage may also be provided to the main controller 40 and the antenna driver 10. The system voltage provided to the antenna driver 10 may be denoted as V _DC .

The main control unit 40 is an apparatus for collectively controlling the operation of the user equipment 1, and may be referred to as a CPU or an AP. The main control unit 40 can load the instruction code stored in the storage unit of the user equipment 1 into the temporary memory and control the operation of the user equipment 1 by executing the instruction indicated by the instruction code. The main control unit 40 may receive the interrupt signal INT from the power control unit 30 through the GPIO port. The main control unit 40 may receive the interrupt signal INT from the antenna driving unit 10 through the wakeup port. The main control unit 40 may communicate with the power control unit 30 and the antenna driving unit 10 using I2C communication.

The antenna current bypass unit 210 is a circuit proposed by the present invention for controlling the current flow inside the antenna unit 20. The antenna current bypass unit 210 is controlled by the antenna driving unit 10 and may include two connection terminals T.S1 and T.S2.

FIG. 1B shows a configuration of a user equipment according to another embodiment of the present invention modified from the embodiment shown in FIG. 1A. 1B, the current bypass unit 210 may be controlled by the main control unit 40. [

The antenna current bypass unit 210 may have two operation modes, which are a bypass control signal V _SW generated from the antenna driving unit 10 or a bypass control signal V _SW generated from the main control unit 40 Can be controlled by a signal (V _SW ). The two operation modes are as follows: first, the current flowing through a part of the current path of the antenna unit 20 is bypassed through two terminals T.S1 and T.S2 of the antenna current bypass unit 210; 1 mode and second mode in which the antenna current bypass unit 210 has no effect on the operation of the antenna unit 20. [

As will be described later, the antenna current bypassing unit 210 may be included in the antenna driving unit 10 or may be separately provided outside the antenna driving unit 10. 1A and 1B show the latter case.

The battery unit 50 may include a battery cell as a device for supplying operating power of the user equipment 1. [ The charging of the battery included in the battery unit 50 may be performed using a charging device connected to the USB / OTG terminal by wire or by using the rectified voltage V _RECT output from the antenna driving unit 10 . ≪ / RTI >

Fig. 2 shows a specific configuration of the switch unit 110 shown in Fig.

The switch unit 110 may include four transistors M _N1 , M _N2 , M _N3 , and M _N4 that can provide an H-bridge type circuit. In the embodiment shown in FIG. 2, the third transistor _MN3 and the fourth transistor _MN4 are upper transistors, and the first transistor _MN1 and the second transistor _MN2 are lower transistors. The upper transistors may be connected together to a node N _A for supplying operating power.

The switch control voltages V _G1 , V _G2 , V _G3 and V _G4 provided from the controller 120 are respectively supplied to the first transistor _MN1 , the second transistor _MN2 , the third transistor _MN3 , Off state among the four terminals of the fourth transistor M _N4 . When the transistor is an FET, the switch control voltages V _G1 , V _G2 , V _G3 , and V _G4 may be provided to the gates of the FETs, respectively.

The switch unit 110 may have two current terminals AC1 and AC2. The first current terminals (AC1) of the first transistors (M _N1) and a third transistor for (M _N3) may be a node that is connected to each other, a second current terminal (AC2) of the second transistors (M _N2) and the fourth May be a node connecting the transistors M _N4 to each other.

Fig. 3 shows an example of the internal structure of the antenna unit 20 shown in Fig.

The antenna unit 20 may include a circuit in which a coil and a capacitor are connected in series or in parallel. This type of antenna portion may be optimized for wireless power reception.

The antenna unit 20 includes a coil Ls, a first resonant capacitor Cs connected to the upper terminal of the coil Ls and a second resonant capacitor Cd connected to the lower terminal of the coil Ls. . ≪ / RTI > The left terminal of the first resonant capacitor Cs may be connected to the upper terminal of the coil Ls and the right terminal of the first resonant capacitor Cs may be connected to the upper terminal of the second resonant capacitor Cd. The lower terminal above the second resonant capacitor Cd may be connected to the lower terminal of the coil Ls. The right terminal of the first resonance capacitor Cs and the lower terminal of the coil Ls may be connected to the current terminals AC1 and AC2 of the switch unit 110, respectively.

In one embodiment, the first resonant capacitor Cs is for improving power transfer efficiency and the second resonant capacitor Cd is for enabling resonant detection.

In the case where the resonance detection is not performed, the antenna unit 20 may be composed of only the coil Ls and the first resonance capacitor Cs without the second resonance capacitor Cd.

The antenna unit 20 shown in FIG. 3 is a structure according to an embodiment, and an antenna unit having a modified structure may be applied to the present invention.

FIG. 4 is a view for explaining a method of driving two different antenna modes according to an embodiment of the present invention.

The main control unit 40 can operate the antenna driving unit 10 and the antenna unit 20 in a wireless power receiving mode, a wireless power transmitting mode, or an MST mode according to a program to be executed. The wireless power reception mode, the wireless power transmission mode, and the MST mode do not occur at the same time. Herein, the wireless power reception mode may be referred to as a first mode, and the MST mode may be referred to as a second mode. The temporal relationship between the wireless power receiving mode and the MST mode may not be predetermined.

When operating in the wireless power reception mode, the antenna unit 20 can generate an induced voltage and an induced current by an electromagnetic field provided from the outside. At this time, the switch unit 110 serves as a rectifier for rectifying the induced current, thereby providing the energy stored in the electromagnetic field as a rectified voltage V _RECT .

When operating in the MST mode, the switch unit 110 may perform a shaping function to control the shape of the coil current I _coil output from the switch unit according to data provided from the main controller 40. The coil current I _coil may cause the coil L _S included in the antenna unit 20 to generate an electromagnetic wave that is emitted to the outside.

As described above, when the antenna unit 20 is optimized for wireless power transmission, the operation according to the wireless power reception mode can be successfully performed, but the operation according to the MST mode may not be successful have. This will be described with reference to FIG.

5 is a view for explaining a problem that occurs when an operation according to the MST mode is performed using the antenna unit optimized for the wireless power reception technique.

5 (a) shows a coil current (I _coil ) generated when an operation according to the MST mode is performed using an antenna unit optimized for the MST technique. When only the antenna unit optimized for wireless power reception is used, the waveform shown in Fig. 5 (a) does not occur.

5B shows a waveform of a coil current I _coil generated when an antenna unit optimized for wireless power reception technology is directly used to perform an operation according to the MST mode. That is, assuming that the antenna unit 20 shown in the circuit of FIG. 1 is optimized for wireless power reception, and that the antenna current bypass unit 210 is not included in FIG. 1, A coil current I _coil as shown in (b) of FIG.

5A and 5B, V _AC1 and V _AC2 respectively indicate current terminal voltages, which are voltages at the first current terminal AC1 and the second current terminal AC2 of the antenna driving unit 10, .

5A and 5B, the waveforms of the current terminal voltages at the first current terminal AC1 and the second current terminal AC2 shown in FIG. Is substantially the same as the waveform of the voltage at the first current terminal AC1 and the second current terminal AC2 shown in Fig. 5 (b). 5 (b), the coil current I _coil has an undershamped shape, and a short time constant is used. However, in FIG. 5 (a), the coil current I _coil has a substantially rectangular waveform, As shown in FIG.

The waveform of the coil current (I _coil ) shown in Figure 5 (a) is intended for the MST technique. In the MST technique, the coil current (I _coil ) is designed to change abruptly according to a predetermined interval.

However, the waveform of the coil current I _coil shown in Fig. 5 (b) is not intended in the MST technique. The coil current (I _coil) in the waveform of the coil current (I _coil) shown in Figure 5 (b), it may turn abruptly changed for a shorter time than the predetermined distance intended by the MST art. Therefore, the waveform of the coil current (I _coil ) shown in FIG. 5 (b) can not successfully transmit the intended information in the MST technique.

The under-damping phenomenon of the coil current (I _coil ) shown in FIG. 5 (b) is caused by the antenna structure optimized for the radio power receiving technique, that is, the circuit structure of the antenna section 20 shown in FIG. 3 will be. The under damping phenomenon occurs due to the resonance frequency of the coil Ls and the first resonance capacitor Cs included in the antenna unit 20 and the resistance of the switch unit 110 coupled to the antenna unit 20 do.

In the embodiment of the present invention, by using the antenna current bypass unit 210 shown in FIG. 1, even if the MST technique is applied to the antenna unit 20 optimized for the radio power reception technique, the under-damping phenomenon can be prevented , The sudden change pattern of the coil current I _coil can be made similar to the pattern intended in the MST technique.

The antenna unit 20 included in the user equipment 1 shown in FIG. 1 is optimized for the wireless power receiving technology and therefore if the antenna current bypass unit 210 is not provided, the coil current I _coil will have the waveform shown in Fig. 5 (b) instead of the waveform shown in Fig. 5 (a).

6 shows an electric device connected to the antenna unit 20 and the antenna unit 20 during the time period when the user equipment 1 shown in FIG. 1 operates in the MST mode.

During the operation of the user equipment 1 in the MST mode, the antenna unit 20 may have any one of the connection state as shown in FIG. 6A or the connection state as shown in FIG. 6B. At this time, the second resonant capacitor has a very small value and does not affect the operation of the circuit.

The third transistor M _N3 and the second transistor M _N2 may be turned on by the third gate voltage V _G3 and the second gate voltage V _G2 in the connection state as shown in FIG. have. At this time, the third turn-on-resistance value, which is the turn-on-resistance value between the source and the drain of the third transistor _MN3 , may vary depending on the specific value of the third gate voltage _VG3 . And a second transistor turned on between the source and the drain of the (M _N2) - a second turn-on resistance value-resistance value may vary depending on the specific value of the second gate voltage (V _G2).

Similarly, in the connection state as shown in FIG. 6B, the fourth transistor M _N4 and the first transistor M _N1 are turned on by the fourth gate voltage V _G4 and the first gate voltage V _G1 , respectively, . The fourth turn-on-resistance value, which is the turn-on-resistance value between the source and the drain of the fourth transistor _MN4 , may vary depending on the specific value of the fourth gate voltage _VG4 . And a first transistor turn-on between the source and the drain of the (M _N1) - resistance value of the first turn-on-resistance value may vary depending on the specific value of the first gate voltage (V _G1).

6, when the user equipment 1 shown in FIG. 1 operates the MST mode, the electric components connected to the antenna unit 20 and the antenna unit 20 are connected to the RLC Circuit type. Depending on the response characteristics of this type of circuit and the magnitude of its resistance component, it can have either under damping, critical damping, or overdamping.

If the user equipment 1 operates in the MST mode, the antenna unit 20 and the antenna unit 20 may be configured such that the first resonant capacitor for determining the resonant frequency for transmitting the power of the antenna unit 20 can be eliminated. 20 can have substantially the shape of the RL circuit, and thus the resonance characteristics of the antenna portion 20 can be eliminated. Therefore, it can be understood that the possibility of success of MST data transmission can be improved by preventing the occurrence of the under-damping phenomenon shown in FIG. 5 (b).

7 is a diagram illustrating a connection state between the antenna current bypass unit 210 and the antenna unit 20 and an internal structure of the antenna current bypass unit 210 according to an embodiment of the present invention. 7 shows an example in which the antenna unit 20 is connected to the third transistor M _N3 and the second transistor M _N2 .

When the user equipment 1 operates in the MST data transmission mode, the influence of the second resonant capacitor Cd shown in Figs. 3 and 6 can be ignored or can be ignored, and the second resonant capacitor Cd You can break the connection between other devices. In order to reflect this, the second resonant capacitor Cd is eliminated in the circuit shown in Fig.

7A shows a connection state of the antenna current bypass unit 210 and the antenna unit 20. As shown in FIG. The first terminal T.S1 and the second terminal T.S2 of the antenna current bypass unit 210 are connected to the left end N1.Cs of the first resonance capacitor Cs included in the antenna unit 20, ) And the right end (N2.Cs).

The right end N2.Cs of the first resonance capacitor Cs may be any one of the two input and output terminals provided to the antenna unit 20. [ The two input / output terminals may be connected to the two current terminals AC1 and AC2, respectively.

Any one of the second terminal T.S2 of the antenna current bypass unit 210, the current terminal AC1 of the antenna driving unit 10, and the two input / output terminals provided to the antenna unit 20, Lt; / RTI > That is, the point that the second terminal T.S2 and the current terminal AC1 are the same node can be understood through the dotted line shown inside the antenna unit 20 shown in Figs. 1A and 1B.

7B shows the internal structure of the antenna current bypass unit 210. As shown in FIG. The antenna current bypass unit 210 is turned on or off by the bypass control signal V _SW provided from the antenna driving unit 10 or the main control unit 40 to the antenna current bypass unit 210 And a controlled bypass switch 211. When the bypass switch 211 by a bypass control signal (V _SW) in the on state the coil current flowing through the coil (Ls), (I _coil) is a bypass switch without passing through the first resonance capacitor (Cs) ( 211). That is, the first resonance capacitor Cs can be operated as if it is absent.

The bypass switch 211 may be, for example, a back-to-back switch shown in FIG. 7C.

LC resonance with the coil Ls does not occur in the absence of the first resonance capacitor Cs, so that the response as shown in FIG. 5 (b) can be prevented from occurring.

The user device 1 controls the bypass switch 211 to be in the on state while the user device 1 is operating in the MST mode and the user device 1 controls the wireless power reception Mode, the bypass switch 211 can be controlled to be in an off state. The selection of any one of these two modes may be selected according to the program executed in the user equipment 1. [ The mode selected according to each program can be transmitted to the antenna driving unit 10 through the main control unit 40.

The operation of the antenna current bypass unit 210, that is, the state of the bypass switch 211, can be controlled by the antenna driving unit 10. In this embodiment, That is, the main control unit 40 directly controls the antenna driving unit 10 and the antenna current bypassing unit 210 can control the antenna driving unit 10.

Alternatively, in another embodiment of the present invention, the operation of the antenna current bypass unit 210, that is, the state of the bypass switch 211, can be directly controlled by the main control unit 40. That is, the main control unit 40 can directly control the antenna driving unit 10 and the antenna current bypass unit 210.

At this time, as the maximum value of the momentary variation of the coil current (I _coil ) becomes larger, the success rate of MST information transmission can be increased or the MST information transmission distance can be increased. For this purpose, it is necessary to reduce the value of the equivalent resistance connected to the coil Ls. To this end, in the case of the circuit shown in FIG. 7, the third transistor (M _N3) a third turn-on between the source and the drain of-resistance and / or the second transistor a second turn-on between the source and the drain of the (M _N2) - The resistance can be reduced.

Now, an embodiment for successfully performing MST data transmission using an antenna for wireless power reception having LC resonance characteristics will be described.

According to one embodiment of the present invention, when operating in the MST data transmission mode, the function of the first resonance capacitor (C _S ) included in the antenna unit 10 for wireless power reception is removed, Properties, and can successfully transfer MST data.

7 (b), in the MST data transmission mode, when the current flowing through the first resonance capacitor Cs is bypassed through the bypass switch 211, the antenna unit 10 and the switch unit The circuit formed by the transistor 110 has the characteristics of an RL series circuit. Therefore, when the current terminal voltages V _AC1 and V _AC2 as shown in FIG. 5A or FIG. 5B are generated, the coil current I _coil can have the same shape as shown in FIG. 5A. Therefore, the MST data transmission can be successfully performed even if the antenna unit 10 for wireless power reception is used.

At this time, in order to reliably transmit MST data, it is necessary to keep the MST data transmission characteristic constant regardless of the system voltage (V _DC ). That is, it is necessary to keep the instantaneous variation value of the coil current I _coil constant regardless of the system voltage V _DC .

To this end, in one embodiment of the present invention, the turn-on resistance (R _ON ) of each transistor M _N is controlled to be further reduced as the system voltage V _DC decreases due to the discharge of the battery. Generally, the gate-source voltage of the transistor and the turn-on-resistance of the transistor have a relationship inversely proportional to each other. Therefore, when the gate-source voltage of each transistor M _N is V _GS and the turn-on resistance of the transistor M _N is R _ON , when the user equipment 1 operates in the MST mode, the system voltage V _DC is controlled to increase the gate-source voltage of each transistor M _N further as V _GS decreases.

For example, each of the transistors (M _N) turns on in when the system voltage is, respectively V _DC1, V _DC2 - the gate of the resistance R _ON, designed such that the _DC1, R _{ON, DC2,} and the transistors (M _N) - Source Voltage Can be designed to be V _{GS, DC 1} , V _{GS, DC 2} . At this time, in one embodiment of the present invention, V _DC1 > V _DC2 , it is preferable that R _{ON, DC1} > R _{ON, and DC2} are satisfied. For this purpose, when the relationship of V _DC1 > V _DC2 is _satisfied , the gate-source voltages V _{GS, DC1 &} lt; V _{GS, DC2} of the respective transistors M _N can be designed.

In the present invention, the antenna unit 20 includes a coil and a capacitor included in the WPT antenna module, and may not include a control unit for controlling the current flowing through the coil.

FIG. 8A shows the configuration of the antenna driving unit 10 and the power control unit 30 shown in FIGS. 1A and 1B in more detail.

When the user equipment 1 operates in the wireless power receiving mode, the first power terminal T.A1 of the antenna driving unit 10 receives the rectified voltage V for power to be supplied to the system load or the battery unit 50 _RECT ). The first power terminal T.A1 may be the same node as the node N _A shown in FIG.

In one embodiment, the rectified voltage V _RECT may be provided to the outside of the antenna driver 10 via the fifth switch M _N5 and the second power terminal T.A2. By doing so, only when it is determined that the rectified voltage V _RECT is stabilized, the fifth switch M _N5 can be turned on to supply the rectified voltage V _RECT to the outside. And the fifth switch M _N5 may be an LDO for improving the quality of the rectified voltage V _RECT .

The second power terminal T.A2 of the antenna driving unit 10 receives the DC voltage V _DC and the DC current VCC from the power supply control unit 30 when the user equipment 1 operates in the radio power transmission mode or the MST mode. I _DC ) may be provided. The direct current voltage V _DC and the direct current I _DC provided from the power supply control unit 30 may be provided to the node N _A through the fifth switch M _N5 . At this time, the connection between the first power terminal T.A1 and the system load or the battery unit 50 can be released.

Meanwhile, when the power control unit 30 provided with the name PMIC is used according to the related art, the MST mode provided according to the embodiment of the present invention may not operate successfully. The reason for this is that the PMIC provided according to the prior art is limited in its output current I _DC to after the first current value ex 1 A because the MST mode provided according to an embodiment of the present invention is successful The output current I _DC should be a second current value (ex: 2A-3A) larger than the first current value. Therefore, in order to successfully operate the MST mode provided according to an embodiment of the present invention while using the PMIC provided according to the related art, the power provided to the node N _A of the antenna driving unit 10 is supplied to the power control unit 30 but not directly from the battery unit 50. [ In order to satisfy such a requirement, the user equipment 1 according to an embodiment of the present invention may have a modified structure as shown in FIG. 8B.

FIG. 8B shows a main configuration of the user device 1 having the structure modified from FIG. 8A.

In the circuit shown in Fig. 8B, the battery voltage V _BAT output from the battery unit 50 may be provided to the first power terminal T.A1 via the switch 71. [ The switch 71 may be provided in the form of a back-light-back-switch, for example, as shown in Fig. 7 (c).

The on / off control of the switch 71 can be determined by the main control section 40. [

In the MST mode, the main controller 40 may keep the switch 71 in the ON state so that the antenna driver 10 receives power directly from the battery unit 50.

In the MST mode, the main control unit 40 controls the DC power supply V _DC and the DC current I _DC provided from the power supply control unit 30 through the second power supply terminal T.A2 to the antenna driving unit 10 ). ≪ / RTI > For this purpose, the current limit in the power supply control unit 30 and the control unit 31 can be controlled to keep the switch 32 in the off state.

In the wireless power transmission mode, the main control unit 40 may keep the switch 71 in the off state so that the antenna driving unit 10 does not receive power directly from the battery unit 50.

In the wireless power transmission mode, the main controller 40 controls the DC voltage V _DC and the DC current I _DC provided from the power supply controller 30 through the second power terminal T.A2, 10). To this end, the current limit in the power supply control unit 30 and the control unit 31 are controlled to keep the switch 32 on.

9 is a modification of the embodiment shown in Figs. 1A and 1B except that the antenna current bypass unit 210 is included in the antenna driver 10. At this time, the bypass control signal V _SW can be directly transmitted from the main control unit 40 to the antenna current bypass unit 210.

The antenna driving unit 10 and the power control unit 30 may be separate ICs manufactured independently of each other. However, according to the modified embodiment of the present invention, both the antenna driving unit 10 and the power control unit 30 may be function modules included in one IC. An IC including the antenna driving unit 10 and the power control unit 30 may be referred to as a 'power control IC', an 'antenna driving IC', or a 'power control IC', for example.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the essential characteristics thereof. The contents of each claim in the claims may be combined with other claims without departing from the scope of the claims.

Claims (13)

A radio power reception antenna comprising a coil, and a first resonant capacitor connected in series with the coil; And an antenna driver configured to provide a coil current to the antenna for receiving the wireless power,
And a coil current bypass unit having two terminals respectively connected to both ends of the first resonance capacitor,
Wherein the antenna driving unit is configured to: maintain an open state between the two terminals during a wireless power reception time period in which wireless power is received from the outside via the antenna for receiving wireless power; While the two terminals are kept in a short-state during an information transmission period for transmitting information to the first terminal,
The antenna driving unit includes a switch unit including four transistors constituting an H-bridge,
The first coil terminal, which is not directly connected to the first resonance capacitor among the two terminals of the coil, is connected to the second input / output terminal second input / output terminal of the H-bridge during the radio power reception time period and during the information transmission time period, Output terminal of the H-bridge, and a first resonance capacitor terminal, which is not directly connected to the coil, of the two terminals of the first resonance capacitor is connected to the first input / output terminal of the H-
User device. The method according to claim 1,
Wherein the coil current bypass section includes a bypass switch controlled by the antenna driving section,
Both terminals of the bypass switch are respectively connected to the two terminals,
Wherein the antenna driving unit is configured to hold the bypass switch in an off state during the wireless power reception time period and to keep the bypass switch in an on state during the information transmission time period,
User device. The user equipment according to claim 2, wherein the bypass switch is a back-lit switch. The method according to claim 1,
Wherein the antenna driving unit controls the switch unit so that the switch unit operates as a rectifier that rectifies the current provided from the antenna for receiving the wireless power during the wireless power reception time period, and (2) during the information transmission period, Wherein the controller is configured to control the switch unit to provide a coil current to the antenna for receiving the wireless power,
User device. A radio power reception antenna comprising a coil, and a first resonant capacitor connected in series with the coil;
An antenna driver configured to provide a coil current to the antenna for receiving wireless power;
A coil current bypass unit having two terminals respectively connected to both ends of the first resonance capacitor;
A battery section;
A power control unit for converting the power provided from the battery unit and providing the converted power to the antenna driving unit; And
A switch for directly supplying power supplied from the battery to the antenna driving unit without passing through the power control unit;
/ RTI >
Wherein the antenna driving unit is configured to: maintain an open state between the two terminals during a wireless power reception time period in which wireless power is received from the outside via the antenna for receiving wireless power; While the two terminals are kept in a short-state during an information transmission period for transmitting information to the first terminal,
The antenna driving unit includes a switch unit including two upper transistors directly connected to a node supplying operation power and two lower transistors directly connected to a reference potential,
The antenna driving unit may include: a first power terminal that exposes a node that supplies the operating power to the outside of the antenna driving unit; and a second power terminal that exposes a node And a second power supply terminal receiving power from the power supply control unit,
The switch is arranged to connect the power output terminal of the battery unit and the first power source terminal to each other,
Characterized in that the ON state of the switch occurs only during the information transmission period.
User device. 6. The method of claim 5,
The antenna drive unit is configured to control the switch unit so that the switch unit provides the coil current to the antenna for receiving the wireless power during the information transmission period,
The antenna driving unit may be configured such that, when a driving voltage of the H-bridge falls, a gate of the at least one transistor and a source of the at least one of the transistors Which is adapted to raise the voltage between the electrodes,
User device. An antenna driving IC adapted to provide a coil current to a radio power receiving antenna comprising a coil and a first resonant capacitor connected in series with the coil,
The first and second resonant capacitors being connected to the first and second resonant capacitors, respectively,
(1) maintains the open state between the two terminals during a wireless power reception time period in which wireless power is received from the outside via the antenna for receiving wireless power,
(2) the terminal is kept in a short-circuit state during an information transmission period in which a cable is transmitted to the outside through the antenna for wireless power reception,
And a switch portion including four transistors constituting the H-bridge,
The first coil terminal, which is not directly connected to the first resonance capacitor among the two terminals of the coil, is connected to the second input / output terminal second input / output terminal of the H-bridge during the radio power reception time period and during the information transmission time period, Output terminal of the H-bridge, and a first resonance capacitor terminal, which is not directly connected to the coil, of the two terminals of the first resonance capacitor is connected to the first input / output terminal of the H-
Antenna driving IC. 8. The method of claim 7,
Wherein the coil current bypass section includes a bypass switch controlled by the antenna driving IC,
Both terminals of the bypass switch are respectively connected to the two terminals,
Wherein the antenna driving IC includes: (1) the bypass switch is turned off during the wireless power reception time interval; (2) the bypass switch is turned on during the information transmission time interval;
Antenna driving IC. 8. The method of claim 7,
Wherein the antenna driving IC controls the switch unit so that the switch unit operates as a rectifier for rectifying the current provided from the antenna for receiving the radio power during the radio power reception time period, Wherein the switch unit is adapted to control the switch unit to provide a coil current to the antenna for receiving the radio power,
Antenna driving IC. 8. The method of claim 7,
The antenna driving IC is configured to control the switch unit so that the switch unit provides the coil current to the antenna for receiving the wireless power during the information transmission period,
The antenna driving unit may be configured such that, when a drive voltage of the H-bridge falls, the gate of at least one of the transistors Source, which is intended to raise the voltage between the sources,
Antenna driving IC. 8. The method of claim 7,
The coil current bypassing unit includes a coil current bypassing unit,
Antenna driving IC. An antenna driving IC adapted to provide a coil current to a radio power receiving antenna comprising a coil and a first resonant capacitor connected in series with the coil,
The first and second resonant capacitors being connected to the first and second resonant capacitors, respectively,
(1) maintains the open state between the two terminals during a wireless power reception time period in which wireless power is received from the outside via the antenna for receiving wireless power,
(2) The antenna is maintained in a short-circuit state between the two terminals during a part of the transmission periods of the electromagnetic wave transmission periods for transmitting the electromagnetic waves to the outside through the antenna for receiving the wireless power,
The antenna driving unit includes a switch unit including four transistors constituting an H-bridge,
The first coil terminal, which is not directly connected to the first resonance capacitor among the two terminals of the coil, is connected between the two input / output terminals and the second input / output terminal of the H-bridge during the wireless power reception time period and the information transmission time period, Output terminal of the H-bridge, and a first resonance capacitor terminal, which is not directly connected to the coil, of the two terminals of the first resonance capacitor is connected to the first input / output terminal of the H-
Antenna driving IC. 13. The antenna driving IC according to claim 12, wherein the part of the transmission time interval is a time period for transmitting the coded information to the outside via the antenna for receiving the radio power.

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