JP2014093692A - Mobile electronic apparatus, mobile communication system, and charging power reception method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a stable changeover of an antenna connection target in the case of small internal power in a mobile electronic apparatus.SOLUTION: A radio communication circuit 110, a charging power reception circuit 150 and a level detection means 130 are connected to a shared antenna 101. The radio communication circuit 110 is connected to a first switch means 120 at both ends. The power reception circuit 150 is connected to a second switch means 140 at both ends. When a detection level of the level detection means 130 is high, the first switch means 120 is switched on and the second switch means 140 is switched off, so that input power is selectively output to the charging power reception circuit 150. When a reception signal level is low, the first switch means 120 is switched off and the second switch means 140 is switched on, so that the reception signal is selectively output to the radio communication circuit 110.

Description

  The present invention relates to a mobile electronic device, a mobile communication system, and a charging power receiving method.

  In a mobile electronic device equipped with a wireless communication mechanism, there is a technique for selectively outputting to a different circuit through a switch when a signal is input to the antenna from the outside.

  For example, an antenna switch circuit that selectively connects the same antenna to different processing circuits has already been published in a patent publication (see, for example, Patent Document 1). FIG. 8 is a diagram showing an outline of a mobile electronic device using the antenna switch circuit of Patent Document 1.

  This mobile electronic device has a function of switching between transmission and reception alternately by an antenna switch circuit 810, and includes a transmission / reception shared antenna 801, a transmission circuit 802, a reception circuit 803, a matching capacitor 804, and an antenna switch circuit. 810.

  The antenna switch circuit 810 includes through-side field effect transistors 811 and 813, shunt-side field effect transistors 812 and 814, a ground capacitor 815, and a bonding wire 816.

  One electrode of the matching capacitor 804 is connected to the shared antenna 801. The other electrode of the matching capacitor 804 is connected to the transmission circuit 802 via the drain and source of the through-side field effect transistor 811 and is connected to the reception circuit 803 via the drain and source of the through-side field effect transistor 813. ing.

  The source of the through-side field effect transistor 811 is connected to the drain of the shunt-side field effect transistor 812, and the source of the shunt-side field effect transistor 812 is grounded by the bonding wire 816 through the grounding capacitor 815. The source of the through-side field effect transistor 813 is connected to the drain of the shunt-side field effect transistor 814, and the source of the shunt-side field effect transistor 814 is grounded by the bonding wire 816 through the grounding capacitor 815.

Next, an operation for transmitting a transmission signal from the transmission circuit 802 via the shared antenna 801 will be described.
When outputting a transmission signal from the transmission circuit 802, the antenna switch circuit 810 applies a high-level control voltage to the gate terminal (CT1) of the through-side field effect transistor 811 to turn on the through-side field effect transistor 811. At the same time, a low-level control voltage is applied to the gate terminal (CT2) of the shunt-side field effect transistor 812 to turn off the shunt-side field effect transistor 812. On the other hand, a low-level control voltage is applied to the gate terminal (CT3) of the through-side field effect transistor 813 to turn off the through-side field effect transistor 813 and to the gate terminal (CT4) of the shunt-side field effect transistor 814. A level control voltage is applied to turn on the shunt-side field effect transistor 814.

  When the control voltage as described above is applied to the antenna switch circuit 810, the transmission signal output from the transmission circuit 802 has the shunt-side field effect transistor 812 in the off state and the through-side field effect transistor in the on state. Therefore, the signal is output from the shared antenna 801 through the matching capacitor 804 with almost no attenuation. In addition, a transmission signal leaking into the receiving circuit 803 through the through-side field effect transistor 813 in the off state is grounded through the shunt-side field effect transistor 814, the grounding capacitor 815, and the bonding wire 816 in the on state. The leaking signal can be reduced.

Next, an operation for receiving a signal transmitted from the outside from the shared antenna 801 will be described.
The antenna switch circuit 810 applies a high-level control voltage to the gate terminal (CT3) of the through-side field effect transistor 813 to turn on the through-side field effect transistor 813, and the gate terminal of the shunt-side field effect transistor 814 ( A low level control voltage is applied to CT4) to turn off the shunt-side field effect transistor 814. On the other hand, a low-level control voltage is applied to the gate terminal (CT1) of the through-side field effect transistor 811 to turn off the through-side field effect transistor 811 and to the gate terminal (CT2) of the shunt-side field effect transistor 812. A level control voltage is applied to turn on the shunt-side field effect transistor 812.

  When the control voltage as described above is applied to the antenna switch circuit 810, the received signal received by the shared antenna 801 has the shunt-side field effect transistor 814 in the off state and the through-side field effect transistor 813 in the on state. To the receiving circuit 803 with almost no attenuation.

  FIG. 9 is a diagram showing a truth table of transmission / reception band switching showing an operation state with respect to the control voltage. By applying a high level voltage to the CT1 terminal and the CT4 terminal, a transmission signal from the transmission circuit 802 is output from the shared antenna 801, and by applying a high level voltage to the CT2 terminal and the CT3 terminal, the shared antenna 801 is output. The reception signal received in step S <b> 1 is input to the reception circuit 803.

JP 2005-303940 A

  Some mobile electronic devices, such as RFID cards, do not have a power source inside. In mobile electronic devices that do not have an internal power source, there are many cases where data is wirelessly supplied from an interrogator for both data communication, temporarily stored, and data communication is performed based on the power. Here, when the technique of Patent Document 1 is used for power reception control, even when an internal power source is provided, or when internal power is temporarily stored without an internal power source, a sufficient level of voltage is provided when the internal power is insufficient. Cannot be applied, the operation of the antenna switch circuit becomes uncertain, the charging itself becomes uncertain, and as a result, the operation of the entire apparatus may be uncertain.

  The present invention has been made paying attention to the above-described problems, and an object of the present invention is to realize a mobile electronic device that can stably switch an antenna connection destination even when internal power is low. Another object of the present invention is to enable stable accumulation of power for operation.

In order to achieve the above object, a mobile electronic device according to the first aspect of the present invention includes:
An antenna,
A wireless communication circuit connected in series with the antenna and communicating with the outside through the antenna;
A charging power receiving circuit that is connected in series with the antenna and receives electric power from the outside via the antenna;
First switch means connected in parallel with the wireless communication circuit;
Second switch means connected in parallel with the charging power receiving circuit;
Level detection means for switching the connection of the first switch means and the second switch means based on the reception level of the antenna;
It is characterized by providing.

A mobile communication system according to the second aspect of the present invention is:
A mobile electronic device according to a first aspect;
An interrogator for performing wireless communication with the mobile electronic device;
A charging power transmission device for transmitting charging power to the mobile electronic device; and
It is characterized by providing.

A mobile communication system according to the third aspect of the present invention is:
A mobile electronic device according to a first aspect;
A charging power transmission device that switches between transmission of charging power to the mobile electronic device and wireless communication with the mobile electronic device; and
It is characterized by providing.

The charging power receiving method according to the fourth aspect of the present invention is:
An antenna, a wireless communication circuit that is connected in series with the antenna and communicates with the outside through the antenna, and a charging power that is connected in series with the antenna and receives power from the outside through the antenna A power receiving circuit;
A charging power receiving method in a mobile electronic device comprising:
Detecting a reception level at the antenna;
Based on the detected level, a first switch step of connecting a circuit of a predetermined impedance in parallel with the wireless communication circuit;
Based on the detected level, a second switch step of connecting a circuit of a predetermined impedance in parallel with the charging power receiving circuit;
It is characterized by providing.

  According to the present invention, it is possible to realize a mobile electronic device and a mobile communication system that can stably switch an antenna connection destination even when internal power is low.

It is a block diagram of the mobile electronic device in this invention. It is a block diagram in 1st embodiment of this invention. It is a block diagram in 2nd embodiment of this invention. It is a block diagram in 3rd embodiment of this invention. It is a block diagram in 4th embodiment of this invention. It is a block diagram in 5th embodiment of this invention. It is a Smith chart figure showing the impedance characteristic of the antenna used by the present invention. It is a figure which shows the outline | summary of the mobile electronic device using the antenna switch circuit of patent document 1. FIG. In the mobile electronic device using the antenna switch circuit of patent document 1, it is the figure which showed the truth table of the band switching of the transmission / reception which showed the operation state with respect to a control voltage.

(First embodiment)
Hereinafter, communication devices according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, the mobile electronic device 100 of the present embodiment includes a shared antenna 101, a wireless communication circuit 110, a first switch unit 120, a level detection unit 130, a second switch unit 140, and a power receiving circuit 150. Is provided. The wireless communication circuit 110 performs communication through the shared antenna 101, and the charging power receiving circuit 150 receives power through the shared antenna 101.

  The shared antenna 101 is a loop antenna and includes two terminals for outputting the received signals. One terminal of the shared antenna 101 is connected to one communication terminal of the wireless communication circuit 110 and one conduction terminal of the first switch means 120, and the other terminal is detected by the level detection means 130. The input terminal is connected to one conduction terminal of the second switch means 140 and one power input terminal of the charging power receiving circuit 150.

  The wireless communication circuit 110 includes two communication terminals. One communication terminal is connected to one terminal of the shared antenna 101 and one conduction terminal of the first switch means 120. The other communication terminal is connected to the other conduction terminal of the first switch means 120, the other power input terminal of the charging power receiving circuit 150, and the other conduction terminal of the second switch means 140. Has been. The wireless communication circuit 110 generates a transmission signal and decodes a reception signal, and communicates with other devices through the shared antenna 101.

The first switch means 120 includes a conduction control terminal and two conduction terminals. When the first switch means 120 is turned on, the two conducting terminals are conducted (connected with a predetermined low impedance), and when turned off, the two conducting terminals are electrically disconnected. One and the other conduction terminals of the first switch means 120 are connected to one and the other communication terminals of the wireless communication circuit 110, respectively. The conduction control terminal is connected to the detection output terminal of the level detection means 130. The first switch unit 120 switches on and off in response to the output from the level detection unit 130.
When the first switch unit 120 is off, the conduction terminals of the first switch unit 120 are in a high impedance state, so that the reception signal at the shared antenna 101 is input to the wireless communication circuit 110. On the other hand, when the first switch unit 120 is turned on, the communication terminals of the wireless communication circuit 110 become conductive, so that the received signal at the shared antenna 101 passes through the first switch unit 120 and bypasses the wireless communication circuit 110. .

The level detection means 130 includes a detection input terminal and two detection output terminals. The detection input terminal is connected to the other terminal of the shared antenna 101 and detects the intensity of the power received by the shared antenna 101. Also, one detection output terminal of the level detection means 130 is connected to the conduction control terminal of the first switch means 120, and the other detection output terminal is for conduction control of the second switch means 140. Connected to the terminal. The level detection means 130 outputs a detection voltage to the conduction control terminals of the first switch means 120 and the second switch means 140 according to the intensity of the received signal input via the detection input terminal.
Here, the level detection means 130 outputs a detection voltage by the power input from the detection input terminal, and does not require any other power when controlling the first switch means 120.

The second switch means 140 includes a conduction control terminal and two conduction terminals. The second switch means 140 is turned on or off by the voltage applied to the conduction control terminal. When turned on, the second conduction means 140 conducts between the two conduction two terminals (connects with a predetermined low impedance). The two electrical terminals are electrically separated.
One and the other conduction terminals of the second switch means 140 are connected to one and the other power reception terminals of the charging power reception circuit 150, respectively. Further, the conduction control terminal of the second switch means 140 is connected to the other detection output terminal of the level detection means 130.
When the second switch unit 140 is turned off, the two conductive terminals are in a high impedance state, and the received signal of the shared antenna 101 is input to the charging power receiving circuit 150. On the other hand, when the second switch means 140 is turned on, the two conducting terminals are conducted, and the reception signal of the shared antenna 101 passes through the second switch means 140 and bypasses the charging power receiving circuit 150.

The charging power receiving circuit 150 includes two power input terminals. One power input terminal is connected to one terminal of the shared antenna 101 and one conduction terminal of the second switch means 140, and the other power input terminal is the other terminal of the second switch means 140. Are connected to the other communication terminal of the wireless communication circuit 110 and the other conduction terminal of the first switch means 120. When power is input from the power input terminal, it receives power and stores it in the internal battery.
Further, the charging power receiving circuit 150 appropriately supplies the power stored in the internal battery as operating power to a circuit including the wireless communication circuit 110.

For example, when the mobile electronic device 100 having the above-described configuration is disposed in the vicinity of a power transmission device for non-contact charging, the shared antenna 101 receives a charging power transmission radio wave transmitted from the transmission device, and performs induction. Generate and output voltage. The level detection means 130 detects the induced electromotive force supplied via the detection input terminal. Since the power of the charging power transmission radio wave is large, the amplitude of the induction signal output from the shared antenna 101 is also large. The level detection circuit 130 detects that the level of the detection signal is higher than the reference level, outputs the detection signal from one detection output terminal to the first switch means 120, and detects the detection signal from the other detection output terminal. Is not output. For this reason, the first switch means 120 is turned on in response to this detection signal, and conducts one conduction terminal and the other conduction terminal, while the second switch means 140 is in a high impedance state. To maintain.
For this reason, the reception signal generated by the shared antenna 101 bypasses the wireless communication circuit 110, is blocked by the second switch means 140, flows through the first switch means 120 and the charging power reception circuit 150, and receives the charging power reception. The circuit 150 stores the supplied power in an internal battery. Here, the control of the first switch means 120 by the level detection means 130 is performed by the received signal at the shared antenna 101, and no other power supply is required, and the operation is performed even when the charge amount of the internal battery is small. Does not affect.

Next, when the mobile electronic device 100 is disposed in the vicinity of a communication device for NFC (Non-Far Communication) communication, for example, the shared antenna 101 transmits radio waves for wireless communication transmitted from the communication device. Receives, generates and outputs an induced voltage. The induced voltage has a small amplitude because the radio communication radio wave is weaker than the power transmission radio wave. For this reason, the detection voltage at the level detector 130 is not sufficiently high. For this reason, the level detection circuit 130 outputs a detection signal from the other detection output terminal to the second switch means 140, and does not output a detection signal from one detection output terminal. The second switch means 140 is turned on in response to this detection signal, and conducts one conduction terminal and the other conduction terminal, while the first switch means 120 is in a high impedance state.
For this reason, the reception signal generated by the shared antenna 101 bypasses the charging power receiving circuit 150, is blocked by the first switch means 120 via the second switch means 140, and flows through the wireless communication circuit 110. . The wireless communication circuit 110 demodulates the power using the power charged in the internal battery of the charging power receiving circuit 150, and thereafter performs wireless notification with the communication device.

  With such a configuration, even when the remaining capacity of the internal battery is small, the shared antenna 101 can be stably connected to the charging power receiving circuit 150 to charge the internal battery. Further, since the wireless communication circuit 110 is substantially invalidated, no loss occurs in the wireless communication circuit 110, and charging can be performed with high efficiency. In addition, when performing wireless communication, the wireless communication circuit 110 is connected to the shared antenna 101 to enable communication. At this time, since the charging power receiving circuit 150 is substantially invalidated, loss in the charging power receiving circuit 150 does not occur, and communication can be performed with high efficiency.

  Next, a more specific configuration and operation will be described.

  FIG. 2 is a specific configuration diagram of the mobile communication system in the first embodiment of the present invention. This mobile communication system includes a mobile electronic device 100 (shown in FIG. 2A), an interrogator 170 (shown in FIG. 2B) that performs data communication with the mobile electronic device 100, and a mobile electronic device. 1 is provided with a charging power transmission device 180 (shown in FIG. 2C) that transmits charging power necessary for charging a battery mounted on 100.

  The mobile electronic device 100 includes a matching capacitor 102, bias resistors 103, 104, and 105, a field effect transistor 106, and a bias resistor 107 in addition to the components shown in the schematic diagram of FIG.

  One terminal of the shared antenna 101 is connected to the communication terminal 110 </ b> A of the wireless communication circuit 110 and the conduction terminal 120 </ b> A of the first switch means 120 via the matching capacitor 102. The other terminal of the shared antenna 101 is connected to the detection input terminal 130A of the level detection means 130, the conduction terminal 140B of the second switch means 140, and the power input terminal 150B of the charging power receiving circuit 150. ing.

  One end of the bias resistor 103 is connected to the detection output terminal 130D of the level detection means 130, and the other end is connected to the bias resistors 104 and 105. The bias resistor 104 is grounded at one end, and the other end is connected to the bias resistors 103 and 105.

One end of the bias resistor 105 is connected to the bias resistors 103 and 104, and the other end is connected to the gate of the field effect transistor 106.
The source of the field effect transistor 106 is grounded, the drain is connected to the bias resistor 107 and the signal input terminal 140C of the second switch means 140, and the gate is connected to the bias resistor 105.
One end of the bias resistor 107 is connected to the drain of the field effect transistor 106 and the signal input terminal 140C of the second switch means 140, and the other end is connected to the power input terminal 150C of the charging power receiving circuit 150. Yes. The bias resistor 107 serves as a path for supplying switch operating power from the battery 158 to the second switch means 140.

  The wireless communication circuit 110 includes matching inductors 111 and 112 and a short-range wireless communication circuit 113, and includes communication terminals 110A and 110B as external terminals. The short-range wireless communication circuit 113 is connected to the communication terminals 110A and 110B via the matching inductors 111 and 112, respectively.

  The first switch means 120 includes DC blocking capacitors 121 and 124, field effect transistors 122 and 123, bias resistors 125 and 126, and a ground resistor 127. Conductive terminals 120A and 120B and control signal input terminals as external terminals. 120C, 120D, and a grounding terminal 120E are provided.

The DC blocking capacitor 121 has one end connected to the conduction terminal 120 </ b> A and the other end connected to the drain of the field effect transistor 122. Similarly, the DC blocking capacitor 124 has one end connected to the conduction terminal 120B and the other end connected to the drain of the field effect transistor 123.
The sources of the field effect transistors 122 and 123 are connected to the ground capacitor 127 and the control signal input terminal 120C in addition to the connection therebetween. The drains of field effect transistors 122 and 123 are connected to DC blocking capacitors 121 and 124, respectively. The gates of the field effect transistors 122 and 123 are connected to one ends of bias resistors 125 and 126, respectively. The bias resistors 125 and 126 are connected at the other end to the control signal input terminal 120D.
One end of the ground resistor 127 is connected to the sources of the field effect transistors 122 and 123, and the other end is connected to the ground terminal 120E.

  As an external connection of the first switch means 120, the conduction terminal 120 </ b> A is connected to the communication terminal 110 </ b> A of the wireless communication circuit 110 and the matching capacitor 102. The conduction terminal 120B is connected to the communication terminal 110B of the wireless communication circuit 110, the conduction terminal 140A of the second switch means 140, and the power input terminal 150A of the power supply circuit 150. The control signal input terminal 120C is connected to the detection output terminal 130B of the level detection means 130, the control signal input terminal 120D is connected to the detection output terminal 130C, and the grounding terminal 120E is grounded.

  With these configurations, the first switch means 120 is turned on when a voltage exceeding a threshold is applied between the control signal input terminals 120C and 120D, and has a function of conducting between the conduction terminals 120A and 120B. . Therefore, when the first switch unit 120 is in the ON state, the signal received by the shared antenna 101 passes through the first switch unit 120 and the wireless communication circuit 110 is bypassed.

  The level detection means 130 includes detection diodes 131 and 132, a DC blocking capacitor 133, a smoothing capacitor 134, and bias resistors 135 and 136. As external terminals, a detection input terminal 130A and detection output terminals 130B, 130C, and 130D. It has.

The cathode of the detection diode 131 is connected to the DC blocking capacitor 133 and the anode of the detection diode 132, and the anode is connected to the detection output terminal 130B.
The anode of the detection diode 132 is connected to the DC blocking capacitor 133 and the cathode of the detection diode 131, and the cathode is connected to the detection output terminal 130D.
One end of the DC blocking capacitor 133 is connected to the cathode of the detection diode 131 and the anode of the detection diode 132, and the other end is connected to the detection input terminal 130A.
The smoothing capacitor 134 has one end connected to the detection output terminal 130B and the other end connected to the detection output terminal 130D.
The bias resistors 135 and 136 constitute a series resistor, the terminal on the bias resistor 135 side is the detection output terminal 130B, the intermediate connection point is the detection output terminal 130C, and the terminal on the bias resistor 136 side is the detection output. Each terminal 130D is connected.

  The detection input terminal 130 </ b> A is connected to one end of the shared antenna 101 as a connection point with the outside of the level detection means 130. Further, the detection output terminals of the level detection means 130 are 130D for the bias resistor 103, 130B for the control signal input terminal 120C for the first switch 120, and 130C for the control signal input terminal for the first switch 120, respectively. 120D is connected to each.

  In the level detection means 130, when an AC signal is applied to the detection input terminal 130A, the signal is rectified by the detection diodes 131 and 132, smoothed by the smoothing capacitor 134, and then passed through the bias resistors 135 and 136. Output as a DC voltage signal. This DC voltage signal is output between the control signal input terminals 120C and 120D of the first switch means 120 to control the first switch means 120.

  The second switch means 140 includes DC blocking capacitors 141 and 144, field effect transistors 142 and 143, bias resistors 145 and 146, and a ground resistor 147. Conductive terminals 140A and 140B as external terminals, control signal input 140C for grounding and the terminal 140D for grounding are provided.

The DC blocking capacitor 141 has one end connected to the conduction terminal 140 </ b> A and the other end connected to the drain of the field effect transistor 142. The DC blocking capacitor 144 has one end connected to the conduction terminal 140 </ b> B and the other end connected to the drain of the field effect transistor 143.
The sources of the field effect transistors 142 and 143 are connected to one end of the ground resistor 147 after both are connected. The drains of field effect transistors 142 and 143 are connected to DC blocking capacitors 141 and 144, respectively. The gates of the field effect transistors 142 and 143 are connected to one ends of bias resistors 145 and 146, respectively. The bias resistors 145 and 146 are connected to the other end of the bias resistors 145 and 146 and connected to the control signal input terminal 140C.
One end of the ground resistor 147 is connected to both sources of the field effect transistors 142 and 143, and the other end is connected to the ground terminal 140D.

  As external connection of the second switch means 140, the conduction terminal 140A includes a communication terminal 110B of the wireless communication circuit 110, a conduction terminal 120B of the first switch means 120, and a power input terminal 150A of the charging power receiving circuit 150. It is connected to the. The conduction terminal 140B is connected to one end of the shared antenna 101, the power input terminal 150B of the charging power receiving circuit 150, and the detection input terminal 130A of the level detection means 130. The control signal input terminal 140C is connected to the battery 158 via the bias resistor 107 and also connected to the drain of the field effect transistor 106. The grounding terminal 140D is grounded.

  From these configurations, the second switch means 140 is turned on when a voltage exceeding a threshold value is applied between the control signal input terminal 140C and the ground terminal 140D, and conducts between the conduction terminals 140A and 140B. Has function. Therefore, when the second switch unit 140 is in the ON state, the reception signal of the shared antenna 101 passes through the second switch unit 140, and the charging power receiving circuit 150 is bypassed.

  The second switch means 140 is turned off when there is no power supplied from the battery 158 (or when the voltage is low). When there is power supplied from the battery 158 and the detection output by the level detection means 130 is weaker than the threshold value, the signal is on, but the detection output by the level detection means 130 is stronger than the threshold value and the field effect transistor 106 is turned on. In this state, the potential difference between the control signal input terminal 140C and the grounding terminal 140D is lowered, and the OFF state is established.

  The charging power receiving circuit 150 includes rectifying diodes 151 to 154, an efficiency improving inductor 155, a smoothing capacitor 156, a power circuit 157, a battery 158, and a control circuit 159, and power input terminals 150A and 150B as external terminals. A terminal 150C for supplying power from the battery and a terminal 150D for grounding are provided.

The rectifying diodes 151 to 154 constitute a full bridge rectifier circuit. In this bridge rectifier circuit, the cathode of the rectifier diode 151 and the anode of the rectifier diode 152 are connected to the power input terminal 150A of the charging power receiving circuit 150, and the rectifier diode 153 is connected to the power input terminal 150B. Are connected to the anode of the rectifying diode 154. The anodes of the rectifying diodes 151 and 153 are connected to each other, and the cathodes of the rectifying diodes 152 and 154 are connected to each other, and each constitutes an output terminal of the bridge rectifier circuit. The output of the bridge rectifier circuit is impedance-matched by the efficiency improving inductor 155, smoothed by the smoothing capacitor 156, and then output to the power supply circuit 157.
The power supply circuit 157 receives power input from the bridge rectifier circuit and outputs power to the battery 158.
The battery 158 is charged with power from the power supply circuit 157. Further, the operating power can be supplied from the power supply terminal 150C to the signal input terminal 140C of the second switch means 140 via the bias resistor 107.
The control circuit 159 is connected to the battery 158 and controls supply of operating power.

  The interrogator 170 includes a short-range wireless communication circuit 171 and a wireless communication antenna 172. The short-range wireless communication circuit 171 transmits and receives communication signals via the wireless communication antenna 172.

  The charging power transmission device 180 includes an oscillation circuit 181, an amplification circuit 182, and a power transmission antenna 183. The periodic signal obtained by the oscillation circuit 181 can be amplified by the amplification circuit 182 and transmitted from the power transmission antenna 183.

  In the configuration of FIG. 2 described above, an operation when wireless communication is performed between the interrogator 170 and the wireless communication circuit 110 of the mobile electronic device 100 will be described.

When a communication signal is transmitted from the interrogator 170 and received by the shared antenna 101 of the mobile electronic device 100, the received signal is input to the level detection means 130 via the detection input terminal 130A, detected, and output for detection output. It is output as a detection voltage between the terminals (130B to 130D). Here, the value of the DC blocking capacitor 133 is set so as not to generate a detection voltage sufficient to turn on the field effect transistors 122 and 123 in the communication carrier wave. Then, the first switch means 120 is not turned on.
On the other hand, in the second switch means 140, the power supply voltage of the battery 158 of the charging power receiving circuit 150 is applied via the bias resistor 107. The values of the bias resistors 104 and 105 are set so that the field effect transistor 106 is not turned on in the communication carrier wave. Therefore, the carrier signal from the interrogator 170 conducts between the source and drain of the field effect transistor 106. Therefore, a potential difference due to the battery 158 is generated between the signal input terminal 140C and the ground terminal 140D of the second switch means 140, and the field effect transistors 142 and 143 are turned on. As a result, the received signal is selectively input to the wireless communication circuit 110 corresponding to the responder, and noise generated in the charging power receiving circuit 150 during wireless communication is prevented from flowing into the wireless communication circuit 110.

  As described above, the first switch unit 120 is turned off and the second switch unit 140 is turned on, thereby reducing noise from the charging power receiving circuit 150 during wireless communication by the wireless communication circuit 110. did.

  Further, when the charge amount of the battery 158 is small and the second switch means 140 cannot be turned on, both switch means are turned off. In that case, the signal received by the shared antenna 101 flows through both the wireless communication circuit 110 and the charging power receiving circuit 150. In this case, if power that can be communicated remains in the internal battery 158, the input impedance of the charging power receiving circuit 150 is due to the bridge rectifier circuit including the rectifier diodes 151 to 154, and the input impedance of the wireless communication circuit 110 is Since the value is much lower than that of the interrogator 170, there is almost no loss, most of the voltage is applied to the wireless communication circuit 110, and the interrogator 170 and the wireless communication circuit 110 are not turned on even if the second switch means 140 is not turned on. It is possible to communicate with.

Next, the operation when there is a power transmission signal from the charging power transmission device 180 in the configuration of FIG. 2 will be described.
When there is a power transmission signal from the charging power transmission device 180 to the mobile electronic device 100, the power transmission signal is received by the shared antenna 101. At this time, the power transmission signal from the charging power transmission device 180 has a high output of about several watts, and a high detection voltage is generated between the detection output terminals 130B and 130C of the level detection means 130. Accordingly, the field effect transistors 122 and 123 Is turned on, and both ends of the wireless communication circuit 110 become conductive. The detection voltage is also output from the detection output terminal 130D, and the voltage is applied to the gate of the field effect transistor 106. As a result, the field effect transistor 106 is turned on, and the signal input terminal 140C of the second switch means 140 is grounded. The potential difference with the terminal 140D for use decreases. Thereby, the 2nd switch means 140 will be in an OFF state.
As described above, since the first switch unit 120 is in the on state and the second switch unit 140 is in the off state, the received power transmission signal is selectively input to the charging power receiving circuit 150 and the power circuit 157 is turned on. Then, it is supplied to the battery 158 as charging power.
Here, since the first switch unit 120 works regardless of the power supply from the battery 158, the first switch unit 120 is turned on regardless of the charging state of the battery 158, so that the charging power receiving circuit 150 has high efficiency. Can supply power.

With the above configuration, a mobile electronic device that can stably switch the antenna connection between the wireless communication circuit 110 and the charging power receiving circuit 150 can be realized even when there is no internal power.
In addition, this invention is not limited to the said embodiment, The application of the following examples is possible.

(Second embodiment)
In the mobile communication system according to the first embodiment of the present invention, wireless communication is performed between the mobile electronic device 100 and the interrogator 170, and transmission / reception of charging power is performed between the mobile electronic device 100 and the charging power transmission device. 180. Since each is performed independently, wireless communication cannot be performed between the mobile electronic device 100 and the charging power transmission device 180.
However, if wireless communication is possible between the mobile electronic device and the charging power transmission device, for example, authentication between devices, control of transmission power, and the like can be realized, and convenience in using the device increases. The second embodiment of the present application realizes this wireless communication.

FIG. 3 is a specific configuration diagram of the mobile communication system according to the second embodiment of the present invention. This mobile communication system includes a mobile electronic device 100 (shown in FIG. 3A), an interrogator 170 (shown in FIG. 3B) that performs data communication with the mobile electronic device 100, and a mobile electronic device. 100 includes a charging power transmission device 200 (shown in FIG. 3C) that transmits charging power necessary for charging a battery mounted on 100 and can wirelessly communicate with the mobile electronic device 100.
The charging power transmission device 200 includes an oscillation circuit 181, a short-range wireless communication circuit 201, a control circuit 202, a changeover switch 203, an amplification circuit 204, and a shared antenna 205. The mobile electronic device 100 and the interrogator 170 are the same as those in the first embodiment, and a description thereof will be omitted.

  In the charging power transmission device 200, the shared antenna 205 is connected to the short-range wireless communication circuit 201 and the amplifier circuit 204 via the changeover switch 203. The short-range wireless communication circuit 201 can generate and analyze a communication signal, and can communicate with the mobile electronic device 100 through the shared antenna 205. In addition, the charging power transmission device 200 can transmit charging power through the shared antenna 205 by amplifying the carrier signal for power transmission generated by the oscillation circuit 181 by the amplifier circuit 204. Based on the control by the control circuit 202, the charging power transmission apparatus 200 can switch between communication by the short-range wireless communication circuit 201 and transmission of charging power by the oscillation circuit 181 and the amplification circuit 204.

  In FIG. 3, the operation at the time of wireless communication by the interrogator 170 is the same as that of the first embodiment, and thus the description thereof will be omitted. The operation at the time of charging power transmission by the charging power transmission device 200 will be described.

In a state where charging power transmission apparatus 200 is not transmitting charging power, changeover switch 203 is connected to short-range wireless communication circuit 201 and wireless communication with mobile electronic device 100 is possible. Yes. When mobile electronic device 100 is at a short distance from charging power transmission device 200, the short-range wireless communication signal from charging power transmission device 200 is received by shared antenna 101.
At this time, since the signal transmitted from the charging power transmission device 200 is a communication signal, the reception power at the shared antenna 101 is sufficiently small, the first switch unit 120 is in the off state, and the second switch unit 140 is Turns on. Therefore, the received signal is input to the short-range wireless communication circuit 113, and wireless communication is performed between both devices. In the wireless communication between the two devices performed here, for example, confirmation that the mobile electronic device 100 exists near the charging power transmission device 200, power transmission request, authentication of the mobile electronic device 100, mobile The state of charge of the battery 158 of the electronic device 100 can be transmitted.

  As a result of wireless communication between the mobile electronic device 100 and the charging power transmission device 200, when the control circuit 202 determines that transmission power is to be started, the control circuit 202 switches the changeover switch 203 to the power transmission side, and the charging signal from the oscillation circuit 181. Is amplified by the amplifier circuit 204 and transmitted by the shared antenna 205. On the other hand, the mobile electronic device 100 receives the transmission power from the charging power transmission device 200 by the shared antenna 101. In this case, since the received power is sufficiently high, the first switch means 120 is turned on and the second switch means 140 is turned off by the function of the level detecting means 130, so that the received power is supplied to the charging power receiving circuit 150. The input of the mobile electronic device is started.

In the mobile electronic device 100 of the present embodiment, the wireless communication circuit 110 cannot perform wireless communication at the same time when charging power is received. However, when the control circuit 202 periodically switches the selector switch 203 to the short-range wireless communication circuit 201 side, it is possible to temporarily stop the transmission of charging power and perform wireless communication.
By periodically performing wireless communication during charging, for example, when the mobile electronic device 100 is removed, power transmission is stopped, and the output from the charging power transmission apparatus 200 is controlled by the state of charge of the battery 158 It becomes possible to do.

  With the above configuration, as in the first embodiment, in addition to realizing a mobile electronic device that can stably switch antennas even when there is no internal power, a charging power receiving device and a mobile body By performing wireless communication with an electronic device, a mobile electronic device and a mobile communication system capable of performing authentication between devices and controlling transmitted power have been realized.

(Third embodiment)
According to the second embodiment of the present application, wireless communication between the mobile electronic device 100 and the charging power transmission device 200 can be realized. However, since wireless communication can be performed only when charging power is not transmitted, in the second embodiment, when wireless communication is performed, power transmission from the charging power transmission device 200 is temporarily stopped, and after wireless communication is completed. Has resumed.
In contrast, the third embodiment of the present application enables wireless communication during power transmission.

  FIG. 4 is a specific configuration diagram of the mobile communication system according to the third embodiment of the present invention. This mobile communication system includes a mobile electronic device 100 (shown in FIG. 4A), an interrogator 170 (shown in FIG. 4B), and a charging power transmission device 310 (FIG. c)). Since the interrogator 170 is the same as that in the first and second embodiments, description thereof is omitted.

  The mobile electronic device 100 includes a shared antenna 101, a wireless communication circuit 110, a first switch unit 120, a level detection unit 130, a second switch unit 140, a charging power receiving circuit 150, and a third switch unit 300. . Among them, the shared antenna 101, the wireless communication circuit 110, the first switch unit 120, the level detection unit 130, and the second switch unit 140 are the same as those in the first and second embodiments, and thus description thereof is omitted. To do.

  The charging power receiving circuit 150 includes rectifying diodes 151 to 154, an efficiency improving inductor 155, a smoothing capacitor 156, a power circuit 157, a battery 158, and a control circuit 159, and power input terminals 150A and 150B as external terminals. A terminal 150C for supplying power from the battery, a terminal 150D for grounding, and a signal output terminal 150E are provided. The charging power receiving circuit 150 in the first and second embodiments is further provided with a signal output terminal 150E, through which a control signal can be output from the control circuit 159.

The third switch means 300 includes DC blocking capacitors 301 and 304, field effect transistors 302 and 303, bias resistors 305 and 306, and a ground resistor 307, two conduction terminals (300A and 300B) as external terminals, and a control signal. An input terminal 300C and a ground terminal 300D are provided. The internal configuration of the third switch means 300 is the same as that of the first and second switch means, and a description thereof is omitted.
As the external connection of the third switch means 300, the conduction terminals 300A and 300B are connected to the power input terminals 150A and 150B of the charging power receiving circuit 150, respectively, and the grounding terminal 300D is grounded. The control signal input terminal 300 </ b> C is connected to the control circuit 159 via the signal output terminal 150 </ b> E of the charging power receiving circuit 150. With the above configuration, the third switch unit 300 can change the reception impedance when the mobile electronic device 100 is receiving the charging power by switching the state under the control of the control circuit 159.

The charging power transmission device 310 includes an amplification circuit 311, a demodulation circuit 312, a control circuit 313, an oscillation circuit 181, and a power transmission antenna 183.
Under the control of the control circuit 313, the periodic signal obtained by the oscillation circuit 181 can be amplified by the amplifier circuit 311 and transmitted from the power transmission antenna 183 as charging power. Further, when the amplitude of the transmission power is modulated during power transmission, it can be detected by the demodulation circuit 312.

In the above configuration, an operation when transmitting charging power by the charging power transmitting apparatus 310 and receiving the power by the mobile electronic device 100 will be described. Since the operation at the time of wireless communication by the interrogator 170 is the same as that of the first embodiment, description thereof is omitted.
When the control circuit 159 inputs a control signal to the third switch means 300 at the time of receiving charging power in the mobile electronic device 100, the state of the third switch means 300 is changed according to the control signal, and conduction between both ends is performed. Switch between with and without. The conduction terminals 300A and 300B of the third switch means 300 are connected to the power input terminals 150A and 150B of the charging power receiving circuit 150. Due to the state change of the third switch means 300, the state where the transmission power is input to the charging power receiving circuit 150 and the state where the transmission power bypasses the charging power receiving circuit 150 are switched. When viewed, it appears as a change in the reception impedance of the mobile electronic device 100. Due to the change in the reception impedance, a reflected wave is generated in the transmission power on the charging power transmission apparatus 310 side, and the transmission amplitude is modulated. By demodulating this modulation in the demodulation circuit 312, the charging power transmission apparatus 310 side can receive the control signal from the control circuit 159. By utilizing this, signal transmission by a load modulation method can be performed.

  As described above, in the third embodiment, as in the first embodiment, in addition to realizing a mobile electronic device that can stably switch antennas even when there is no internal power, charging power Even during power transmission, communication from the mobile electronic device 100 to the charging power transmission apparatus 310 is possible using the third switch means 300. Thereby, control such as transmission power adjustment during charging can be realized.

(Fourth embodiment)
According to the third embodiment, wireless communication during transmission of charging power between the mobile electronic device 100 and the charging power transmission device 310 can be realized. However, in the third embodiment, both the second switch means 140 and the third switch means 300 are connected to the power input terminal of the charging power receiving circuit 150, and the circuit is complicated. It was.
On the other hand, the fourth embodiment of the present application aims to realize the same effect as that of the third embodiment by a more simplified circuit.

  FIG. 5 is a specific configuration diagram of the mobile communication system according to the fourth embodiment of the present invention. This mobile communication system includes a mobile electronic device 100 (shown in FIG. 5A), an interrogator 170 (shown in FIG. 5B), and a charging power transmission device 310 (FIG. c)). Since the interrogator 170 is the same as that in the first and second embodiments, description thereof is omitted.

  The mobile electronic device 100 includes a shared antenna 101, a wireless communication circuit 110, a first switch unit 120, a level detection unit 130, a second switch unit 400, and a charging power receiving circuit 150. Of these, the second switch means 400 is the same as in the third embodiment except for the second switch means 400, and the description thereof will be omitted.

  The second switch means 400 includes DC blocking capacitors 401 and 404, field effect transistors 402 and 403, a ground resistor 405, bias resistors 406 to 409, and five external terminals. The external terminals are the conduction terminals 400A and 400B, the control signal input terminals 400C and 400D, and the ground terminal 400E, respectively. The second switch means 400 is different from the second switch means 140 in the third embodiment in that the field effect transistors 402 and 403 are not limited to the control signal input terminal 400C but also via the control signal input terminal 400D. This is the point that the applied power can be applied.

The control signal input terminal 400C corresponds to the control signal input terminal 140C of the second switch means 140, and is connected to the field effect transistors 402 and 403 via the bias resistors 407 and 409, respectively. The battery 158 is connected via the terminal 107.
The control signal input terminal 400D is connected to the field effect transistors 402 and 403 through the bias resistors 406 and 408, respectively, and is also connected to the control signal output terminal 150E of the charging power receiving circuit 150. Thereby, in the 2nd switch means 400, in addition to the signal input from the battery 158, it can switch between an ON state and an OFF state by the signal input from the control circuit 159. In other respects, the second switch means 400 is the same as the second switch means 140.
The second switch means 400 is switched between an on state and an off state by a signal input to the control signal input terminal 400C or 400D.

  In the above configuration, an operation when transmitting charging power by the charging power transmitting apparatus 310 and receiving the power by the mobile electronic device 100 will be described. Since the operation at the time of wireless communication by the interrogator 170 is the same as that of the first embodiment, description thereof is omitted.

  When the control circuit 159 inputs a control signal to the second switch unit 400 when receiving charging power in the mobile electronic device 100, the state of the second switch unit 400 changes in accordance with the control signal, and conduction between both ends is performed. Switch between with and without. The conduction terminals 400A and 400B of the second switch means 400 are connected to the power input terminals 150A and 150B of the charging power receiving circuit 150. Due to the state change of the second switch means 400, the state in which the transmission power is input to the charging power receiving circuit 150 and the state in which the transmission power bypasses the charging power receiving circuit 150 are switched. When viewed, it appears as a change in the reception impedance of the mobile electronic device 100. Due to the change in the reception impedance, a reflected wave is generated in the transmission power on the charging power transmission apparatus 310 side, and the transmission amplitude is modulated. By demodulating this modulation in the demodulation circuit 312, the charging power transmission apparatus 310 side can receive the control signal from the control circuit 159. By utilizing this, signal transmission by a load modulation method can be performed.

  With the above configuration, as in the third embodiment, even when there is no internal power, antenna switching can be performed stably, and the mobile electronic device 100 can transfer to the charging power transmission device 310 even during charging power transmission. It is possible to realize a mobile communication system that can perform the above communication. In addition, as compared with the third embodiment, one switch means is not required, and the circuit in the mobile electronic device 100 can be simplified.

(Fifth embodiment)
In the mobile communication system according to the fourth embodiment of the present invention, the mobile electronic device 100 changes the reception impedance of the mobile electronic device 100 by switching the state of the second switch means 400 while receiving charging power. Thus, the carrier wave is modulated, and communication from the mobile electronic device 100 to the charging power transmission device 310 is realized. Here, when the second switch unit 400 is in the ON state, the charging efficiency is lowered due to modulation of the reception impedance of the mobile electronic device 100. In the fifth embodiment of the present invention, the reduction in charging efficiency due to the above communication is realized.

FIG. 6 is a specific configuration diagram of the mobile communication system according to the fifth embodiment of the present invention. This mobile communication system includes a mobile electronic device 100 (shown in FIG. 6A), an interrogator 170 (shown in FIG. 6B), and a charging power transmission device 310 (shown in FIG. 6C). Prepare. The interrogator 170 and the charging power transmission device 310 are the same as those according to the fourth embodiment.
The mobile electronic device 100 includes a shared antenna 101, a wireless communication circuit 110, a first switch unit 120, a level detection unit 130, a second switch unit 400, a charging power receiving circuit 150, and a third switch unit 500. . Among these, the shared antenna 101, the wireless communication circuit 110, the first switch unit 120, and the level detection unit 130 are the same as those according to the fourth embodiment.

  The charging power receiving circuit 150 is obtained by further adding an external terminal 150F to the charging power receiving circuit 150 according to the fourth embodiment. The external terminal 150 </ b> F is connected to the cathodes of the rectifying diodes 152 and 154 and the efficiency improving inductor 155 in the charging power receiving circuit 150. The external terminal 150F is externally connected to the conduction terminal 500A of the third switch means 500.

  The second switch means 400 includes DC blocking capacitors 401 and 404, field effect transistors 402 and 403, a ground resistor 405, bias resistors 406 to 409, and five external terminals. The external terminals are the conduction terminals 400A and 400B, the control signal input terminals 400C and 400D, and the ground terminal 400E, respectively.

  The second switch unit 400 is different from the second switch unit 400 according to the fourth embodiment in that the conduction terminal 400B is not the power input terminal 150B of the charging power receiving device 150 but the grounding terminal 150D. It is a connected point. About others, it is the same as the 2nd switch means 400 concerning 4th embodiment.

The third switch means 500 includes DC blocking capacitors 501 and 504, field effect transistors 502 and 503, bias resistors 505 and 506, and a grounding resistor 507, and external terminals for conduction terminals 500A and 500B and a control signal input terminal 500C. And a grounding terminal 500D. The internal configuration of the third switch unit 500 is the same as that of the first switch unit 120, and a description thereof will be omitted.
The conduction terminal 500A of the third switch means 500 is connected to the external terminal 150F of the charging power receiving circuit 150, the conduction terminal 500B is one end of the shared antenna, the detection input terminal 130A of the level detection means 130, The charging power receiving circuit 150 is connected to the power input terminal 150B. The control signal input terminal 500 </ b> C is connected to the control signal output terminal 150 </ b> E of the charging power receiving circuit 150. The grounding terminal 500D is grounded.

When the control circuit 159 outputs a control signal to the second switch means 400 and the third switch means 500, the second switch means 400 is turned on, and conduction occurs at both ends of the rectifier diode 151. When the third switch means 500 is turned on, conduction occurs at both ends of the rectifier diode 154. The rectifier diodes 151 and 154 are in opposite positions in the bridge rectifier circuit, and both ends of the two opposite diodes of the bridge rectifier circuit are short-circuited.
In this state, when an AC voltage is applied between the charging power input terminals 150A and 150B of the charging power receiving device 150, a rectifying effect is obtained by the effects of the rectifying diodes 152 and 153 in the phase where the charging power input terminal 150B side is positive. However, in the phase in which the charging power input terminal 150B side is a negative polarity, no potential difference is generated between the anode side of the rectifier diodes 151 and 153 and the cathode side of the rectifier diodes 152 and 154.

In the above configuration, an operation when performing wireless communication between the interrogator 170 and the mobile electronic device 100 will be described.
In the present embodiment, when the second switch means 400 is turned on, it is the ground point and the charging power input terminal 150A of the charging power receiving circuit 150 that are conducted, and the charging power as in the first embodiment. There is no conduction between the input terminals. However, even in this state, since the charging power input terminal 150B and the ground point are connected via the rectifying diode 153, noise generated from the power supply circuit 157 can be removed. Therefore, as in the first embodiment, during the wireless communication by the wireless communication circuit 110, a reduction in noise from the charging power receiving circuit 150 is realized.

Next, in the configuration of FIG. 6, an operation when performing wireless communication by a modulation method while transmitting charging power between the charging power transmission apparatus 310 and the mobile electronic device 100 will be described.
When a modulation signal is output from the control circuit 159, the states of the second switch means 400 and the third switch means 500 are switched between ON and OFF accordingly. As described above, when the second switch unit 400 and the third switch unit 500 are in the ON state, only the portion of the AC signal input to the charging power receiving device 150 whose charging power input terminal 150B side is positive is the charging power. The power receiving circuit 150 is bypassed. That is, the modulation signal from the control circuit 159 modulates the phase where the charge power input terminal 150B side is positive in the power input to the charge power receiving circuit, but does not modulate the opposite phase. . Using this modulation, as in the third and fourth embodiments, signal transmission from the mobile electronic device 100 to the charging power transmission device 310 by the load modulation method can be realized.

  From the above, under the control of the control circuit 159, the carrier wave for charging power transmission is modulated in the carrier wave with respect to the phase where the charging power input terminal 150B side is positive, and wireless communication is realized using this, and no reflected wave is generated. Since charging can be performed with the same efficiency as usual in the phase, a decrease in charging efficiency can be reduced.

  Further, in the fourth embodiment, when the reception impedance changes due to the change in the distance between the antennas of the charging power transmission device 310 and the mobile electronic device 100, the reflected wave of power is modulated and the communication accuracy is deteriorated. was there. In the present embodiment, since both ends of the rectifier diodes 151 and 154 are modulated, there is less impedance variation due to variations in the distance between the antennas due to the effects of the rectifier diodes 152 and 153, and communication is possible compared to the fourth embodiment. Accuracy degradation can be reduced.

  With the above configuration, as in the fourth embodiment, even when there is no internal power, antenna switching can be performed stably, and communication from the mobile electronic device 100 to the charging power transmission device 310 can be performed even during charging power transmission. In addition to being able to realize a mobile communication system that can be used with fewer switch means than in the third embodiment, mobile communication with less deterioration in communication accuracy due to fluctuations in the distance between antennas and a small decrease in charging efficiency. A system can be realized.

  In the configuration of the present embodiment, the bypassed rectifier diodes only need to be in opposite positions in the bridge rectifier circuit, that is, the rectifier diodes 152 and 153 may be bypassed.

  In the first to fifth embodiments of the present application, the short-range wireless communication circuit 113 includes matching inductors 111 and 112 at both ends. FIG. 7 shows the result of the experimental impedance characteristic of the antenna shown in FIG. 7 as a Smith chart, which will be described below.

  FIG. 7A shows an impedance characteristic Imp1 of a general antenna used in the 13.56 MHz band in short-range wireless communication. The antenna characteristics show inductive impedance characteristics in the 13.56 MHz band, and the equivalent inductance value is about 1.5 μH. In short-range wireless communication, communication accuracy can be improved by using an antenna that exhibits characteristics close to this.

  On the other hand, FIG. 7B shows impedance characteristics when the common antenna 101 side is viewed from the short-range wireless communication circuit 113 with the first switch unit 120 in the off state and the second switch unit 140 in the off state. Imp2 is shown, and impedance characteristics Imp3 in the case where the matching inductors 111 and 112 are not provided under the same conditions are shown. As the inductance values of the matching inductors 111 and 112, 1.0 μH inductors are used.

  In FIG. 7B, the impedance characteristic Imp3 without the matching inductors 111 and 112 is capacitive, and the equivalent capacitance value is about 335 pF. This is greatly different from the general antenna impedance shown in FIG. It is considered that such characteristics are caused by the shared antenna 101 and the charging power receiving circuit 150 being connected in parallel.

On the other hand, the impedance characteristic Imp2 when the matching inductors 111 and 112 are added is inductive, and an equivalent inductance value is about 1.7 μH. Under this condition, a value close to the general antenna impedance characteristic Imp1 shown in FIG. 7A is obtained.
From the above, even when the charging power receiving circuit 150 is connected in series with the wireless communication circuit 110, a simple configuration can be obtained by connecting the matching inductors 111 and 112 to both ends of the short-range wireless communication circuit 113. Thus, antenna matching characteristics equivalent to the antenna used in the short-range wireless communication circuit of Patent Document 1 can be obtained.

  A part or all of the above-described embodiment can be described as in the following supplementary notes, but is not limited thereto.

(Appendix 1)
An antenna,
A wireless communication circuit connected in series with the antenna and communicating with the outside through the antenna;
A charging power receiving circuit that is connected in series with the antenna and receives electric power from the outside via the antenna;
First switch means connected in parallel with the wireless communication circuit;
Second switch means connected in parallel with the charging power receiving circuit;
Level detection means for detecting the reception level of the antenna and switching the states of the first switch means and the second switch means based on the detected level;
Mobile electronic equipment with

(Appendix 2)
The first switch means switches between an on state in which the reception signal of the antenna is diverted from the wireless communication circuit and an off state in which the reception signal of the antenna is input to the wireless communication circuit,
The second switch means switches between an on state in which the reception signal of the antenna is bypassed from the charging power receiving circuit and an off state in which the reception signal of the antenna is input to the charging power receiving circuit.
The mobile electronic device according to appendix 1.

(Appendix 3)
The level detection means turns off the first switch means when the signal strength of the reception signal of the antenna is lower than a threshold value.
The mobile electronic device according to attachment 2.

(Appendix 4)
The level detecting means turns the second switch means on when the first switch means is turned off, and turns the second switch means on when the first switch means is turned on. It is in an off state,
The mobile electronic device according to appendix 2 or 3.

(Appendix 5)
The charging power receiving circuit includes a battery for supplying power to the second switch means,
The level detection means turns on the second switch means by supplying power from the battery when the first switch means is turned off.
The mobile electronic device according to appendix 4.

(Appendix 6)
The mobile electronic device according to any one of appendices 1 to 5,
An interrogator for performing wireless communication with the mobile electronic device;
A charging power transmission device for transmitting charging power to the mobile electronic device; and
A mobile communication system comprising:

(Appendix 7)
The mobile electronic device according to any one of appendices 1 to 5,
A charging power transmission device that switches between transmission of charging power to the mobile electronic device and wireless communication with the mobile electronic device; and
A mobile communication system comprising:

(Appendix 8)
The charging power transmission device includes a demodulation circuit that detects modulation of transmission power during charging power transmission,
The mobile electronic device includes third switch means for modulating reception impedance during charging power reception, and a control circuit for controlling the third switch means,
During charging power transmission from the charging power transmission device to the mobile electronic device, the reflected wave generated by switching the state of the third switch means by the control of the control circuit causes the mobile electronic device to Communicating to a charging power transmission device,
The mobile communication system according to attachment 6.

(Appendix 9)
The charging power transmission device includes a demodulation circuit that detects modulation of transmission power during charging power transmission,
The mobile electronic device includes a control circuit capable of modulating the reception impedance while receiving charging power by controlling the second switch means;
During charging power transmission from the charging power transmission device to the mobile electronic device, reflected waves generated by switching the state of the second switch means by control of the control circuit, from the mobile electronic device Communicating to a charging power transmission device,
The mobile communication system according to attachment 6.

(Appendix 10)
The charging power receiving circuit includes a rectifier circuit,
The second switch means is connected to the rectifier circuit;
The second switch means is configured such that only one of a signal in a positive direction or a negative direction among the received signal of the antenna and the off state where the received signal of the antenna is input to the charging power receiving circuit is charged. It is characterized by switching between an on state that bypasses the power receiving circuit,
The mobile communication system according to appendix 9.

(Appendix 11)
The rectifier circuit is a bridge rectifier circuit composed of four diodes,
When the second switch means is turned on, the reception signal of the antenna bypasses two opposing diodes of the bridge rectifier circuit,
The mobile communication system according to supplementary note 10, characterized by that.

(Appendix 12)
An antenna, a wireless communication circuit that is connected in series with the antenna and communicates with the outside through the antenna, and a charging power that is connected in series with the antenna and receives power from the outside through the antenna A power receiving circuit;
A charging power receiving method in a mobile electronic device comprising:
Detecting a reception level at the antenna;
Based on the detected level, a first switch step of connecting a circuit of a predetermined impedance in parallel with the wireless communication circuit;
Based on the detected level, a second switch step of connecting a circuit of a predetermined impedance in parallel with the charging power receiving circuit;
A charging power receiving method comprising:

DESCRIPTION OF SYMBOLS 100 Mobile electronic device 101 Shared antenna 102 Matching capacity | capacitance 103-105 Bias resistance 106 Field effect transistor 107 Bias resistance 110 Radio | wireless communication circuit 111, 112 Matching inductor 113 Short-range radio | wireless communication circuit 120 1st switch means 121, 124 DC blocking capacity 122, 123 Field effect transistors 125, 126 Bias resistor 127 Ground resistance 130 Level detection means 131, 132 Detection diode 133 DC blocking capacitor 134 Smoothing capacitor 135, 136 Bias resistor 140 Second switch means 141, 144 DC blocking capacitor 142, 143 Field effect transistors 145, 146 Bias resistor 147 Ground resistor 150 Charging power receiving circuit 151-154 Rectifier diode 155 Efficiency improving inductor 156 Smoothing capacitor 157 Electric Circuit 158 Battery 159 Control circuit 170 Interrogator 171 Short-range wireless communication circuit 172 Wireless communication antenna 180 Charging power transmission device 181 Oscillation circuit 182 Amplification circuit 183 Power transmission antenna 200 Charging power transmission device 201 Short-range wireless communication circuit 202 Control circuit 203 switch 204 amplifier circuit 205 common antenna 300 third switch means 301, 304 DC blocking capacitors 302, 303 field effect transistors 305, 306 bias resistor 307 ground resistor 310 charging power transmission device 311 amplifier circuit 312 demodulator circuit 313 control circuit 400 Second switch means 401, 404 DC blocking capacitance 402, 403 Field effect transistor 405 Ground resistance 406-409 Bias resistance 500 Third switch means 501, 504 DC blocking capacitance 5 2,503 field-effect transistor 505 and 506 bias resistor 507 ground resistance

Claims (10)

An antenna,
A wireless communication circuit connected in series with the antenna and communicating with the outside through the antenna;
A charging power receiving circuit that is connected in series with the antenna and receives electric power from the outside via the antenna;
First switch means connected in parallel with the wireless communication circuit;
Second switch means connected in parallel with the charging power receiving circuit;
Level detection means for detecting the reception level of the antenna and switching the states of the first switch means and the second switch means based on the detected level;
Mobile electronic equipment with The first switch means switches between an on state in which the reception signal of the antenna is diverted from the wireless communication circuit and an off state in which the reception signal of the antenna is input to the wireless communication circuit,
The second switch means switches between an on state in which the reception signal of the antenna is bypassed from the charging power receiving circuit and an off state in which the reception signal of the antenna is input to the charging power receiving circuit.
The mobile electronic device according to claim 1. The level detection means turns off the first switch means when the signal strength of the reception signal of the antenna is lower than a threshold value.
The mobile electronic device according to claim 2. The level detecting means turns the second switch means on when the first switch means is turned off, and turns the second switch means on when the first switch means is turned on. It is in an off state,
The mobile electronic device according to claim 2 or 3. The mobile electronic device according to any one of claims 1 to 4,
An interrogator for performing wireless communication with the mobile electronic device;
A charging power transmission device for transmitting charging power to the mobile electronic device; and
A mobile communication system comprising: The mobile electronic device according to any one of claims 1 to 4,
A charging power transmission device that switches between transmission of charging power to the mobile electronic device and wireless communication with the mobile electronic device; and
A mobile communication system comprising: The charging power transmission device includes a demodulation circuit that detects modulation of transmission power during charging power transmission,
The mobile electronic device includes third switch means for modulating reception impedance during charging power reception, and a control circuit for controlling the third switch means,
During charging power transmission from the charging power transmission device to the mobile electronic device, the reflected wave generated by switching the state of the third switch means by the control of the control circuit causes the mobile electronic device to Communicating to a charging power transmission device,
The mobile communication system according to claim 5. The charging power transmission device includes a demodulation circuit that detects modulation of transmission power during charging power transmission,
The mobile electronic device includes a control circuit capable of modulating the reception impedance while receiving charging power by controlling the second switch means;
During charging power transmission from the charging power transmission device to the mobile electronic device, reflected waves generated by switching the state of the second switch means by control of the control circuit, from the mobile electronic device Communicating to a charging power transmission device,
The mobile communication system according to claim 5. The charging power receiving circuit includes a rectifier circuit,
The second switch means is connected to the rectifier circuit;
The second switch means is configured such that only one of a signal in a positive direction or a negative direction among the received signal of the antenna and the off state where the received signal of the antenna is input to the charging power receiving circuit is charged. It is characterized by switching between an on state that bypasses the power receiving circuit,
The mobile communication system according to claim 8. An antenna, a wireless communication circuit that is connected in series with the antenna and communicates with the outside through the antenna, and a charging power that is connected in series with the antenna and receives power from the outside through the antenna A power receiving circuit;
A charging power receiving method in a mobile electronic device comprising:
Detecting a reception level at the antenna;
Based on the detected level, a first switch step of connecting a circuit of a predetermined impedance in parallel with the wireless communication circuit;
Based on the detected level, a second switch step of connecting a circuit of a predetermined impedance in parallel with the charging power receiving circuit;
A charging power receiving method comprising:

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