JP2013165043A - Portable apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To further suppress battery exhaustion in a portable apparatus which is hold by a user of a vehicle and performs wireless communication with an on-vehicle apparatus mounted on the vehicle.SOLUTION: A portable apparatus 4 comprises: a communication circuit 41 for performing wireless communication with an on-vehicle apparatus; and a control unit 42. The communication circuit 41 and control unit 42 are supplied with drive power by a battery 434. The portable apparatus 4 also comprises: a vibration power generation device 44 for performing AC power generation when the portable apparatus 4 is vibrated; and a wireless charge device 46 for receiving power from a wireless power transmission device transmitting the power wirelessly. The power generated by the vibration power generation device 44 is rectified by a rectifier circuit 45, and the battery 434 is charged with the power rectified by the rectifier circuit 45. The power received by the wireless charge device 46 is rectified by a rectifier circuit 47, and the battery 434 is charged with the power rectified by the rectifier circuit 47.

Description

  The present invention relates to a portable device that is carried by a user of a vehicle and wirelessly communicates with an in-vehicle device mounted on the vehicle.

  Conventionally, a smart entry system that performs wireless communication between a vehicle and a portable device (electronic key) and permits the locking / unlocking of the vehicle door or the engine start based on the communication result is known. . And conventionally, in order to suppress the battery running out of the portable device used in the smart entry system or the like, a vibration power generation device that generates power by vibration applied to the portable device, and a power storage device that stores the power generated by the vibration power generation device, There is a proposal of a portable device provided with (see Patent Document 1). According to this, since the user can generate electric power and store the generated electric power by vibration applied to the portable device when the user is walking with the portable device, it is possible to suppress the battery running out of the portable device.

JP 2011-132774 A

  However, in the invention of Patent Document 1, power generation and power storage cannot be performed unless the user is walking with a portable device. That is, the invention of Patent Document 1 is insufficient in terms of suppressing the battery running out of the portable device.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the portable device which can suppress battery exhaustion further.

In order to solve the above-mentioned problem, a portable device according to the present invention is a portable device possessed by a user of a vehicle and provided with a communication unit that wirelessly communicates with an in-vehicle device mounted on the vehicle,
Vibration power generation means for generating power by vibrating the portable device;
Power receiving means for receiving power from a power transmitting means for transmitting power wirelessly;
A power storage means connected to both the vibration power generation means and the power reception means, for storing the power generated by the vibration power generation means and the power received by the power reception means as power for driving the communication means; It is characterized by providing.

  According to the portable device of the present invention, when the portable device is vibrated, the vibration power generation unit generates power, and the generated power is stored in the power storage unit. In addition, since the portable device of the present invention includes a power receiving unit that receives power transmitted wirelessly from the power transmitting unit, the power received by the power receiving unit can also be stored in the power storage unit. That is, even when no vibration is applied to the portable device, since the means for storing electric power is secured in the power storage device, it is possible to further suppress the battery running out of the portable device.

Further, in the present invention, the internal impedance of the vibration power generation means is higher than the internal impedance of the power reception means,
Switching means for switching between conduction and disconnection of the first path between the vibration power generation means and the power storage means, and switching between conduction and disconnection of the second path between the power reception means and the power storage means;
Power receiving determination means for determining whether or not power is received by the power receiving means;
A switching control means for controlling the switching means so that the first path is conducted and the second path is disconnected when the power reception determining means determines that there is no power reception by the power receiving means. Features.

  According to the present invention, when there is no power reception by the power receiving means, the second path to which the power receiving means having a low internal impedance is connected is disconnected, so that the electric power stored in the power storage means leaks to the second path side. Can be prevented. At this time, since the first path to which the vibration power generation means is connected is conducted, the power generated by the vibration of the portable device can be stored in the power storage means.

Further, in the present invention, comprising a power generation determination means for determining the presence or absence of power generation by the vibration power generation means,
The power transmission means is provided in the in-vehicle device,
When the power generation determination unit determines that the vibration power generation unit does not generate power, the communication unit transmits an instruction signal instructing execution of power transmission by the power transmission unit to the in-vehicle device,
The switching control means controls the switching means so that the second path is conducted when the power generation determination means determines that there is no power generation by the vibration power generation means.

  According to the present invention, when the power transmission means is provided in the in-vehicle device and there is no power generation by the vibration power generation means, an instruction signal instructing power transmission by the power transmission means is transmitted from the portable device (communication means) to the in-vehicle device. When the in-vehicle device receives the instruction signal, power transmission by the power transmission means is performed. Further, when there is no power generation by the vibration power generation means, the second path is conducted and the power reception means and the power storage means are connected, so if the power reception means is arranged at a position where the power from the power transmission means can be received, The power received by the power receiving means can be stored in the power storage means. As described above, when there is no power generation by the vibration power generation means, power storage by the power transmission means and the power reception means is attempted, so that the battery running out of the portable device can be suppressed.

In the present invention, the vibration power generation means performs AC power generation by vibrating the portable device,
The power receiving means receives power from the power transmitting means as AC power,
An input unit connected to both the vibration power generation unit and the power reception unit, and an output unit connected to the power storage unit, and converts the AC power input to the input unit into DC power and outputs the output A shared conversion means for outputting to the
The power storage unit stores DC power output from the output unit.

  According to the present invention, the conversion means for converting AC power from the vibration power generation means to DC power and the conversion means for converting AC power from the power reception means to DC power are shared by the common conversion means. Compared with the case where it is provided separately, the portable device can be reduced in size.

Further, in the present invention, a voltage dividing means that is arranged between the vibration power generation means and the shared conversion means, includes a voltage dividing capacitor, and divides the voltage of the AC power generated by the vibration power generation means with the voltage dividing capacitor. Prepared,
The shared conversion means converts the AC power of the voltage divided by the voltage dividing means into DC power,
The power transmission means transmits an electromagnetic wave for power generation at a predetermined power supply frequency,
The power receiving means includes an antenna coil that receives the electromagnetic wave, and a resonance capacitor that forms a resonance circuit that resonates with the antenna coil at the feeding frequency, and the resonance circuit receives the electromagnetic wave when the antenna coil receives the electromagnetic wave. To generate AC power at the power supply frequency,
The resonance capacitor is also used as the voltage dividing capacitor.

  According to the present invention, since the resonance capacitor of the power receiving means is also used as the voltage dividing capacitor of the voltage dividing means, the portable device can be reduced in size compared to the case where the resonance capacitor and the voltage dividing capacitor are provided separately.

  Further, in the present invention, when assuming that AC power having a predetermined vibration power generation frequency is generated from the vibration power generation means, the impedance of the voltage dividing means at the vibration power generation frequency is the same as the internal impedance of the vibration power generation means. As described above, a capacity of the voltage dividing capacitor is set.

  According to the present invention, since the impedance of the voltage dividing means at the vibration power generation frequency assumed as the frequency of the AC power by the vibration power generation means is the same as the internal impedance of the vibration power generation means, When AC power is generated at a frequency, the AC power can be efficiently transmitted to the power storage means via the shared conversion means. Here, “the impedance of the voltage dividing means is the same as the internal impedance of the vibration power generation means” means that the impedances are completely the same, and there are some errors (for example, 0 to 20%). This is a concept that allows for an error.

Further, in the present invention, a vibration power generation side path through which an alternating current generated by the vibration power generation means connected to the vibration power generation means flows, and an antenna side through which the AC current connected to the power reception means and received by the power reception means flows The path merges on the way, and the merged path that is the path after the merge is connected to the shared conversion means,
The capacitance of the resonance capacitor is set so that the impedance of the resonance capacitor at the vibration power generation frequency is higher than the input impedance of the shared conversion means.

  According to the present invention, the vibration power generation side path through which the alternating current generated by the vibration power generation unit flows and the antenna side path through which the AC current received by the power reception unit merges are shared, and the merged path after the merge is shared. Since it is connected to the conversion means, both the alternating current generated by the vibration power generation means and the alternating current received by the power reception means can be converted into direct current power by the common conversion means. At this time, since the impedance of the resonance capacitor (included in the power receiving means connected to the antenna side path) is higher than the input impedance of the shared conversion means, the vibration power generation frequency from the vibration power generation side path It is possible to suppress the alternating current from flowing from the junction of the vibration power generation side path and the antenna side path to the antenna side path. Therefore, the electric power generated by the vibration power generation means can be efficiently stored in the power storage means.

  In the present invention, the internal impedance of the vibration power generation means is a high impedance value that prevents an alternating current from the antenna side path from flowing into the vibration power generation side path. Thereby, the power received by the power receiving means can be efficiently stored in the power storage means.

3 is a block diagram showing a configuration of an in-vehicle device 5. FIG. It is the figure which looked at the vehicle 10 from upper direction. It is the figure which showed the driver's seat 103 periphery of a vehicle interior. It is the block diagram which showed the structure of the portable device 4 of 1st Embodiment. It is a detailed block diagram of the portable device 4 of 1st Embodiment. FIG. 4 is a diagram showing a structure of a vibration power generation device 44. 6 is an output waveform diagram of the vibration power generation device 44. FIG. It is a flowchart of the path | route switching process which the control part performs. It is a flowchart of the power transmission process which ECU54 performs. It is the figure which illustrated the time change of the voltage generated with vibration power generation device 44 and wireless charging device 46. It is a block diagram of the portable device 4 of 2nd Embodiment. FIG. 6 is a diagram illustrating time variation of current flowing through a path 66;

(First embodiment)
Hereinafter, a first embodiment of a portable device according to the present invention will be described. In this embodiment, an example in which the present invention is applied to a portable device of a so-called smart entry system will be described. First, the configuration of an in-vehicle device that performs wireless communication with a portable device will be described. FIG. 1 is a block diagram showing a configuration of an in-vehicle device 5 mounted on a vehicle. FIG. 2 shows a view of the vehicle 10 as viewed from above, and is a diagram for explaining the installation positions and the like of the transmitters 51 and 52. As shown in FIG. 1, the in-vehicle device 5 includes a vehicle interior transmitter 51, a vehicle interior transmitter 52, a receiver 53, a wireless power transmission device 55, and an ECU 54 connected thereto. As shown in FIG. 2, a plurality of outside-vehicle transmitters 51 are provided in the door 101 and the trunk portion 102 of the vehicle 10, and the surrounding area 11 (the peripheral area of the door 101, An LF band (for example, 134 kHz) request signal is transmitted to the peripheral area. The peripheral area 11 is an area of about 1 m from the installation position of the vehicle interior transmitter 51.

  The vehicle interior transmitter 52 is provided in the vehicle interior and transmits the request signal to the vehicle interior. In this embodiment, as shown in FIG. 2, a front-side vehicle interior transmitter 521 that transmits a request signal to a front area (an area near the front seat) in the vehicle interior, and a rear area (rear seat) in the vehicle interior. A rear vehicle interior transmitter 522 that transmits a request signal to a nearby area) is provided.

  The receiver 53 receives a response signal in an RF band (for example, 300 to 400 MHz) transmitted from the portable device 4 (see FIG. 2) possessed by the user 20. The receiver 53 is provided in the C pillar of the vehicle 10, for example. A signal received by the receiver 53 is input to the ECU 54.

  The wireless power transmission device 55 is a device that wirelessly transmits power to a peripheral area of the wireless power transmission device 55. Specifically, the wireless power transmission device 55 includes an AC signal generation circuit 551, an antenna coil 552, and an antenna coil 552 and a capacitor 553 that constitutes a resonance circuit 554 (in this embodiment, a series resonance circuit). The AC signal generation circuit 551 is a circuit that is connected to the resonance circuit 554 and causes the resonance circuit 554 to generate an AC signal having a commercial frequency of 13.56 MHz. The AC signal generation circuit 551 is configured by a switching element or the like like a power transmission unit described in Japanese Patent Application Laid-Open No. 2011-109810, for example. When an AC signal of 13.56 MHz flows through the resonance circuit 554, an AC magnetic flux of 13.56 MHz is generated in the antenna coil 552. As a result, an electromagnetic wave for generating power of 13.56 MHz is transmitted from the antenna coil 552 to the outside. The transmission area of the electromagnetic wave, that is, the transmission area of the power transmitted from the wireless power transmission device 55 is, for example, about a few tens of centimeters from the antenna coil 552.

  Here, FIG. 3 is a view showing the vicinity of the driver's seat 103 in the passenger compartment. The wireless power transmission device 55 (strictly speaking, the antenna coil 552) is provided in the console 104 between the driver's seat 103 and the passenger seat (not shown). Specifically, the antenna coil 552 is provided on the back side of the surface 105 of the console 104 so as to be substantially parallel to the surface 105. That is, the antenna coil 552 is provided in the vicinity of the surface 105 so that the electromagnetic wave is transmitted.

  Returning to the description of FIG. 1, the ECU 54 includes a CPU, a memory, and the like, and the CPU executes a process related to the smart entry system by executing a process according to a control program stored in the memory. Specifically, the ECU 54 modulates the LE data generation unit 541 that generates the baseband signal of the request signal, and the baseband signal generated by the LF data generation unit 541 with a predetermined modulation method (for example, ASK modulation). An RF demodulation unit 543 that demodulates an analog signal received by the LF modulation unit 542 and the receiver 53 into a digital signal is provided. The signal modulated by the LF modulation unit 542 is input to the vehicle interior transmitter 51 and the vehicle interior transmitter 52. When the vehicle 10 is parked, the ECU 54 generates a request signal with the LF data generation unit 541 and the LF modulation unit 542, and transmits the generated request signal to the vehicle interior transmitter 51 and the vehicle interior transmitter 52. . Prior to the transmission of the request signal, the ECU 54 causes the transmitters 51 and 52 to transmit a wake-up signal for returning the portable device 4 in the standby state (power saving state) to the normal state. The ECU 54 transmits the request signal when the presence of the portable device 4 can be confirmed after the transmission of the wakeup signal.

  When the receiver 53 receives a response signal transmitted from the portable device 4 in response to the request signal, the ECU 54 demodulates the response signal by the RF demodulation unit 543 and includes the ID included in the demodulated response signal. The code is checked against a master code stored in advance in the memory. When verification is possible, the ECU 54 locks or unlocks the door 101 and the trunk 102 (see FIG. 2) with respect to the door lock ECU 22 connected to the in-vehicle LAN 21, or the engine ECU (illustrated). The engine is started on the condition that the engine start switch (not shown) is operated.

  The ECU 54 also controls the AC signal generation circuit 551 to execute power transmission processing that causes the wireless power transmission device 55 to transmit power (electromagnetic waves for power generation). Details of the power transmission processing will be described later.

  Next, the configuration of the portable device 4 will be described. FIG. 4 is a block diagram showing the configuration of the portable device 4. Note that the in-vehicle device 5 in FIG. 1 and the portable device 4 in FIG. 4 constitute a smart entry system. As illustrated in FIG. 4, the portable device 4 includes an LF antenna 411, an LF receiver 412, a controller 42, an RF transmitter 431, an RF antenna 432, an operation unit 433, a battery 434, and vibration power generation. A device 44, a wireless charging device 46, and rectifier circuits 45 and 47 are provided. Although not shown in FIG. 4, the portable device 4 further includes a switch 48 and a voltage dividing circuit 49 (see FIG. 5). The LF antenna 411 is an antenna that receives a request signal transmitted from the in-vehicle device 5 (transmitters 51 and 52). The LF reception unit 412 is an IC that is connected to the LF antenna 411 and performs processing such as demodulation on the request signal received by the LF antenna 411. The signal processed by the LF receiving unit 412 is input to the control unit 42.

  The RF transmission unit 431 modulates the baseband signal from the control unit 42 into an RF band signal of a predetermined modulation method (for example, ASK modulation). The modulated signal is input to the RF antenna 432. The RF antenna 432 is an antenna that transmits the response signal input from the RF transmission unit 431 to the outside. The response signal transmission area is, for example, about ten meters from the RF antenna 432.

  The operation unit 433 is an operation unit (for example, a push switch) that is operated by the user and instructs locking and unlocking of the door 101 (see FIG. 2) of the vehicle 10. When the operation unit 433 is operated, a signal indicating that the operation unit 433 has been operated is input to the control unit 42. The battery 434 is connected to the control unit 42 and the LF receiving unit 412, and supplies driving power (for example, about 2 or 3 V) to the control unit 42 and the LF receiving unit 412. The battery 434 is a rechargeable secondary battery (a capacitor, a lithium ion battery, or the like).

  The control unit 42 includes a CPU, a memory, and the like, and executes processing related to the smart entry system by executing processing according to a control program stored in the memory. Specifically, the control unit 42 shifts itself to a standby state (power saving state) until a wakeup signal from the in-vehicle device 5 is received. And when the control part 42 receives the wake-up signal from the vehicle equipment 5 (when the wake-up signal is input from the LF receiving part 412), it returns from the standby state to the normal state, A response signal for the wake-up signal is transmitted to the RF transmission unit 431 and the RF antenna 432. After that, when receiving a request signal from the in-vehicle device 5, the control unit 42 generates a baseband signal of a response signal including an ID code stored in a memory (not shown), and the baseband signal is generated. Output to the RF transmitter 431. That is, the response signal including the ID code is transmitted to the RF transmission unit 431 and the RF antenna 432.

  In addition, when a signal is input from the operation unit 433, the control unit 42 causes the RF transmission unit 431 and the RF antenna 432 to transmit a signal instructing locking or unlocking the door 101 of the vehicle 10. Thus, in this embodiment, in addition to the smart entry system that locks and unlocks the door 101 based on mutual communication between the in-vehicle device 5 and the portable device 4, the door 101 is operated based on the operation of the operation unit 433. Wireless key systems that lock and unlock are also applied.

  Further, the control unit 42 controls switching between conduction and disconnection of the path 63 between the vibration power generation device 44 and the battery 434 and switching between conduction and disconnection of the path 65 between the wireless charging device 46 and the battery 434. Perform the switching process. The route switching process will be described later.

  A vibration power generation device 44 and a wireless charging device 46 are connected to the battery 434 via rectifier circuits 45 and 47. Electric power from the vibration power generation device 44 and the wireless charging device 46 can be charged to the battery 434. The vibration power generation device 44 is a device that generates power by being vibrated, and the wireless charging device 46 is a device that receives power transmitted from the wireless power transmission device 55 (see FIG. 1). The rectifier circuits 45 and 47 are circuits that rectify the power generated by the vibration power generation device 44 and the power received by the wireless charging device 46. Electric power rectified by the rectifier circuits 45 and 47 is charged in the battery 434. The configuration of the broken line portion 400 in FIG. 4 including the vibration power generation device 44 and the wireless charging device 46 is a characteristic portion of the present invention. Hereinafter, the configuration of the broken line portion 400 will be described in detail.

  FIG. 5 shows a detailed configuration of the portable device 4 (particularly, a detailed configuration of the broken line portion 400 of FIG. 4). 5, the LF antenna 411, the LF receiving unit 412, the RF transmitting unit 431, and the RF antenna 432 in FIG. 4 are referred to as a “communication circuit 41”. Further, in FIG. 5, the illustration of the operation unit 433 in FIG. 4 is omitted. As shown in FIG. 5, the vibration power generation device 44 includes a voltage source V1 that generates an alternating voltage when the vibration power generation device 44 is vibrated, and an internal resistance (internal impedance) R1 connected in series with the voltage source V1. It is shown by the equivalent circuit provided with. In this embodiment, as the vibration power generation device 44, an electret power generation type device that generates power using an electret material (an insulator having a semi-permanent charge) is employed.

  Here, FIG. 6 is a diagram showing the structure of the vibration power generation device 44. As shown in FIG. 6, the vibration power generation device 44 includes an electret electrode substrate 441 and a metal electrode substrate 444 facing the electret electrode substrate 441. There is a fixed gap (gap) between the electrode substrates 441 and 444. The electret electrode substrate 441 includes a main body substrate 442 and a plurality of electret electrodes 443 formed on the main body substrate 442 at regular intervals. Each electret electrode 443 is formed of an electret material. In the present embodiment, seven electret electrodes 443 are formed on the main body substrate 442. On the other hand, the metal electrode substrate 444 includes a main body substrate 445 and a plurality of metal electrodes 446 formed on the main body substrate 445. Each metal electrode 446 is made of metal. The same number of metal electrodes 446 as the electret electrodes 443, that is, seven metal electrodes are formed. Each metal electrode 446 is formed at a position facing each electret electrode 443.

  Each electret electrode 443 has a charge (negative charge in FIG. 6). Therefore, the same number of charges as the charges of the electret electrodes 443, opposite in polarity to the charges of the electret electrodes 443 (positive charges in FIG. 6) are induced in each metal electrode 446. The metal electrode substrate 444 is movable in the horizontal direction P (see FIG. 6) when vibration is applied to the vibration power generation device 44 (portable device 4). When the metal electrode substrate 444 moves, the electrostatic capacity between the electret electrode 443 and the metal electrode 446 changes, and electricity corresponding to the change is taken out (power generation). The power waveform (voltage waveform, current waveform) generated from the vibration power generation device 44 is an AC waveform corresponding to the vibration applied to the vibration power generation device 44. Specifically, the frequency of the electric power generated from the vibration power generation device 44 is equal to the frequency of vibration applied to the vibration power generation device 44. The magnitude of the electric power generated from the vibration power generation device 44 changes according to the magnitude of vibration (vibration acceleration) applied to the vibration power generation device 44.

  Here, FIG. 7 is a diagram showing how the output waveform of the vibration power generation device 44 changes depending on the presence or absence of vibration applied to the vibration power generation device 44. Specifically, FIG. FIG. 7B shows an output waveform of the vibration power generation device 44 when vibration of a frequency of 30 Hz and 0.5 G is applied to the vibration power generation device 44. FIG. 7B shows vibration power generation when there is no vibration applied to the vibration power generation device 44. The output waveform of the device 44 is shown. 7A and 7B, the vertical axis represents voltage (V), and the horizontal axis represents time (sec). The vibration (30 Hz, 0.5 G) applied to the vibration power generation device 44 is vibration actually applied to the portable device 4 (for example, vibration applied to the portable device 4 when the user walks while holding the portable device 4, (Vibration applied to the portable device 4 when the device 4 is in the passenger compartment).

  As shown in FIG. 7A, it can be seen that when vibration is applied to the vibration power generation device 44, an AC voltage is output from the vibration power generation device 44. The period of the waveform 121 of the AC voltage is about 0.03 sec. That is, the frequency of the waveform 121 is about 30 Hz, which is equivalent to the frequency of vibration 30 Hz applied to the vibration power generation device 44. In practice, an alternating voltage (waveform 122) having a shorter period than the waveform 121 is generated, and the waveform connecting the vertices of the waveform 122 is the waveform 121. The frequency of the waveform 122 is a frequency according to the frequency (= 30 Hz) of the vibration applied to the vibration power generation device 44 and the number of electret electrodes 443 (= 7), specifically, about 30 Hz × 7 = 210 Hz. Has been. On the other hand, when there is no vibration applied to the vibration power generation device 44, it can be seen that no voltage is output from the vibration power generation device 44, as shown in FIG.

  Since the electret electrode substrate 441 and the metal electrode substrate 444 are provided apart from each other, the resistance between the electret electrode substrate 441 and the metal electrode substrate 444, that is, the internal impedance R1 of the vibration power generation device 44 is high. Specifically, the internal impedance R1 is about 15 MΩ. Therefore, a relatively large voltage (= current × internal impedance) is output from the vibration power generation device 44, and specifically, for example, a voltage of several tens of volts is output.

  Returning to the description of FIG. 5, the path 61 connected to the vibration power generation device 44 is provided with a voltage dividing circuit 49 that divides the AC voltage output from the vibration power generation device 44 into a voltage proportional to the AC voltage. Yes. One end of the voltage dividing circuit 49 is connected to the output side of the vibration power generation device 44, and the other end is connected to the ground. The voltage dividing circuit 49 is a series resistor circuit in which two resistors 491 and 492 are connected in series. The alternating voltage from the vibration power generation device 44 is divided into a voltage having a magnitude corresponding to the ratio of the resistors 491 and 492. Specifically, the AC voltage (for example, several tens of volts) from the vibration power generation device 44 is converted into an AC voltage at the drive voltage level (for example, about 2, 3 volts) of the control unit 42 and the communication circuit 41 by the voltage dividing circuit 49. Divided pressure.

  The impedance of the voltage dividing circuit 49, that is, the combined resistance value of the resistors 491 and 492 (resistor 491 + resistor 492) is set to be equal to the internal impedance R1 (= about 15 MΩ) of the vibration power generation device 44. The phrase “equally set” not only means that the impedance of the voltage dividing circuit 49 is set to be completely the same as the internal impedance R1 of the vibration power generation device 44, but also from the internal impedance R1. It is a concept that includes setting in a form having some error (for example, an error of 20% of R1). Thereby, the electric power generated by the vibration power generation device 44 can be efficiently transmitted to the circuits after the voltage dividing circuit 49.

  One end of the path 62 is connected between the resistors 491 and 492 of the voltage dividing circuit 49. An alternating current based on the voltage divided by the voltage dividing circuit 49 flows through the path 62. The path 62 is branched into two paths 621 and 622 from the middle. One path 622 is connected to the control unit 42 via a current limiting resistor 421 that limits the current flowing through the path 622. That is, the voltage of the path 622 is input to the control unit 42. The other path 621 is connected to the input 451 on the positive side of the full-wave rectifier circuit 45 in which four diodes 450 are bridge-connected. Note that the negative input section 452 of the rectifier circuit 45 facing the positive input section 451 is connected to the ground. The current flowing through the path 62 hardly flows through the path 622 to which the current limiting resistor 421 is connected, and flows into the rectifier circuit 45 through the path 621. The rectifier circuit 45 is a circuit that performs full-wave rectification on the input alternating current and outputs it to the positive-side output unit 453. A path 63 through which the rectified direct current flows is connected to the output unit 453. The path 63 is connected to the positive side of the battery 434 via the switch 48. The negative output part 454 of the rectifier circuit 45 facing the positive output part 453 is connected to the negative side (ground) of the battery 434.

  The wireless charging device 46 includes an antenna coil 461 that receives an electromagnetic wave of 13.56 MHz transmitted from the wireless power transmission device 55 (see FIG. 1), and a resonance capacitor 462 that is connected in series with the antenna coil 461. Yes. The antenna coil 461 and the resonance capacitor 462 constitute a resonance circuit that resonates at 13.56 MHz. That is, the inductance of the antenna coil 461 and the capacitance of the resonance capacitor 462 are set so that the resonance frequency is 13.56 MHz. Therefore, when the antenna coil 461 receives an electromagnetic wave from the wireless power transmission device 55, an alternating current of 13.56 MHz flows through the resonance circuits 461 and 462. The antenna coil 461 is formed in, for example, a square spiral shape in the same plane. The size of the antenna coil 461 is, for example, about 3 cm at the mouth. Since the wireless charging device 46 includes the antenna coil 461 and the resonance capacitor 462 having low impedance, the internal impedance of the wireless charging device 46 is a value that is much lower than the internal impedance R1 (= about 15 MΩ) of the vibration power generation device 44 ( For example, 1 MΩ or less.

  A path 64 through which an alternating current generated by the wireless charging device 46 flows is connected to the wireless charging device 46. The path 64 is connected to inputs 471 and 472 of a full-wave rectifier circuit 47 in which four diodes 470 are bridge-connected. The rectifier circuit 47 is a circuit that performs full-wave rectification on the input alternating current and outputs it to the positive output unit 473. A path 65 through which the rectified direct current flows is connected to the output unit 473. The path 65 is connected to the positive side of the battery 434 via the switch 48. The negative output part 474 of the rectifier circuit 47 facing the positive output part 473 is connected to the negative side (ground) of the battery 434.

  The switch 48 has two contacts 481 and 482 (hereinafter referred to as input-side contacts) on the input side, and one contact 483 (hereinafter referred to as output-side contact) on the output side. A path 63 on the vibration power generation device 44 side is connected to one input side contact 481 of the switch 48. A path 65 on the wireless charging device 46 side is connected to the other input side contact 482. The positive side of the battery 434 is connected to the output side contact 483. The switch 48 is a switch for switching the input side contact between the input side contacts 481 and 482 to be conducted to the output side contact 483 based on an instruction from the control unit 42. That is, the switch 48 is a switch for switching between conduction and disconnection between the battery 434 and the path 63 and switching between conduction and disconnection between the battery 434 and the path 65. As the switch 48, for example, a high frequency switch composed of a transistor or the like can be employed.

  According to the portable device 4 having the configuration described above, on the condition that the switch 48 is switched to the vibration power generation device 44 side, the power generated by the vibration power generation device 44 is divided into the voltage dividing circuit 49 and the rectifier circuit. The battery 434 is charged via 45. Further, according to the portable device 4, the power generated by the wireless charging device 46 is charged to the battery 434 via the rectifying circuit 47 on the condition that the switch 48 is switched to the wireless charging device 46 side. In addition, the scene shown in FIG. 3 is assumed as a scene where wireless power feeding is performed on the portable device 4. That is, it is assumed that the portable device 4 is placed on the surface 105 of the console 104 provided with the wireless power transmission device 55 while the user is driving. For example, a mark indicating a power feeding location where wireless power feeding is performed may be provided on a portion of the surface 105 immediately above the wireless power transmitting device 55 (antenna coil 552). Or you may provide the mounting part (For example, the recessed part dented in the shape of the housing | casing of the portable device 4) for mounting the portable device 4 in the part directly above. Thereby, the user can grasp | ascertain an electric power feeding location easily.

  As described above, the control unit 42 performs a path switching process for switching between conduction and disconnection of the paths 63 and 65 according to the situation. Next, details of the route switching process will be described. Simultaneously with the description of the path switching process, the power transmission process executed by the ECU 54 of the in-vehicle device 5 to control the AC signal generation circuit 551 and cause the wireless power transmission device 55 to transmit power (electromagnetic waves for generating power) will be described. .

  Here, FIG. 8 shows a flowchart of the path switching process executed by the control unit 42. Note that the processing of the flowchart of FIG. 8 is started, for example, when the portable device 4 is activated (for example, when the portable device 4 is shipped), and thereafter repeatedly executed at regular intervals. FIG. 9 shows a flowchart of power transmission processing executed by the ECU 54. 9 is started, for example, when the ECU 54 is activated (for example, when the ECU 54 is shipped), and thereafter repeatedly executed at regular intervals. First, the control unit 42 switches the switch 48 to the contact 481 (see FIG. 5) side, and conducts the path (paths 61, 62, 621, 63) on the vibration power generation device 44 side (S11). That is, the path on the vibration power generation device 44 side is made conductive in advance, so that the generated power is efficiently charged into the battery 434 when the vibration power generation device 44 generates power. At this time, the route (routes 64 and 65) on the wireless charging device 46 side is disconnected.

  Next, based on whether or not the voltage input to the control unit 42 via the current limiting resistor 421 (see FIG. 5) is less than a predetermined threshold value, whether or not the power generation amount of the vibration power generation device 44 is insufficient is determined. Judgment is made (S12). When it is not insufficient, that is, when the power generation amount of the vibration power generation device 44 is sufficient (S12: No), the processing of the flowchart of FIG. In this case, since the conduction on the path on the vibration power generation device 44 side is maintained, the power generated by the vibration power generation device 44 is charged in the battery 434.

  In S12, when the power generation amount of the vibration power generation device 44 is insufficient (when no vibration is applied to the portable device 4) (S12: Yes), the process proceeds to S13. In S13, the switch 48 is switched to the contact 482 (see FIG. 5) side, and the path (paths 64 and 65) on the wireless charging device 46 side is conducted (S13). Next, using the RF transmission unit 431 and the RF antenna 432 (see FIG. 4), an instruction signal instructing the wireless power transmission device 55 to perform power feeding is transmitted to the in-vehicle device 5 (S14). If the in-vehicle device 5 is located in the transmission area of the RF antenna 432 (for example, an area about 10 meters from the RF antenna 432), the instruction signal transmitted in S14 is received by the receiver 53 of the in-vehicle device 5. Note that either of the processes of S13 and S14 may be executed first.

  The in-vehicle device 5 (ECU 54) determines whether or not the instruction signal has been received (S21 in FIG. 9). When the instruction signal is received (S21: Yes), the AC signal generation circuit 551 (see FIG. 1) is controlled to cause the wireless power transmission device 55 (antenna coil 552) to transmit an electromagnetic wave for generating power (S22). . Thereby, wireless power feeding can be performed on the portable device 4 as a condition that the portable device 4 is located at a predetermined power feeding location (see FIG. 3). Thereafter, the processing of the flowchart of FIG. 9 ends. On the other hand, when the instruction signal is not received (S21: No), the processing of the flowchart of FIG. In this case, although the instruction signal is transmitted from the portable device 4, the vehicle-mounted device 5 is located outside the instruction signal transmission area, or the instruction signal is not transmitted from the portable device 4. Is assumed. Thus, since the wireless power transmission device 55 performs power supply as necessary, power consumption of the in-vehicle device 5 can be suppressed.

  Returning to the description of FIG. 8, after the process of S14, it is determined whether or not the battery 434 is charged from the wireless charging device 46 (S15). Specifically, the control unit 42 determines whether or not the terminal voltage of the battery 434 has increased after the process of S14 (S15). When the terminal voltage of the battery 434 increases (S15: Yes), the process of the flowchart of FIG. In this case, since the continuity (S13) of the path on the wireless charging device 46 side is maintained, the electric power generated by the wireless charging device 46 is charged into the battery 434.

  On the other hand, when the increase in the terminal voltage of the battery 434 cannot be confirmed (S15: No), it is determined that there is no charge by the wireless charging device 46, and the process proceeds to S16. In this case, although there is power feeding from the wireless power transmission device 55, the position of the portable device 4 is ineligible for the power feeding (the portable device 4 is not placed at the predetermined feeding position in FIG. 3). The situation is assumed. In addition, a situation where power is not supplied from the wireless power transmission device 55 because the in-vehicle device 5 has not received the instruction signal transmitted in S14 is also assumed. In S16, the control unit 42 switches the switch 48 to the contact 481 side, makes the path on the vibration power generation device 44 side conductive, and disconnects the path on the wireless charging device 46 side (S16). As described above, by disconnecting the battery 434 from the wireless charging device 46 having a low internal impedance and connecting the battery 434 to the vibration power generation device 44 having a high internal impedance, leakage of the power charged in the battery 434 can be suppressed. . After the process of S16, the process of the flowchart of FIG.

  Here, FIG. 10 illustrates the time change of the voltage generated by the vibration power generation device 44 and the wireless charging device 46. In FIG. 10, the vertical axis represents voltage (V), and the horizontal axis represents time (sec). In FIG. 10, the voltage after being converted into direct current by the rectifier circuits 45 and 47 is shown. In FIG. 10, waveforms 131 and 133 indicate voltage waveforms generated by the vibration power generation device 44, and a waveform 132 indicates a voltage waveform generated by the wireless charging device 46. Further, in FIG. 10, in order to easily understand the switching state from charging by the vibration power generation device 44 to charging by the wireless charging device 46, the voltage (waveform 131) by the vibration power generation device 44 and the voltage (waveform by the wireless charging device 46). 132).

  When the voltage of FIG. 10 is generated from the vibration power generation device 44 and the wireless charging device 46, the voltage indicated by the waveform 131 (equivalent to the area surrounded by the waveform 131 is strictly) while there is power generation from the vibration power generation device 44. Battery 434 is charged. Thereafter, when power generation by the vibration power generation device 44 is lost (dotted line 133), switching to charging by the wireless charging device 46 is performed (S13 and S14 in FIG. 8 are executed). Then, the battery 434 is charged with a voltage indicated by the waveform 132 (strictly, power corresponding to the area surrounded by the waveform 132). Eventually, the battery 434 is charged with both the voltage indicated by the waveform 131 and the voltage indicated by the waveform 132.

  As described above, according to the portable device 4 of the present embodiment, since the vibration power generation device 44 that generates power by the vibration of the portable device 4 is provided, the battery can be used while the user walks while holding the portable device 4. 434 can be charged with power. Further, since the portable device 4 includes the wireless charging device 46, the battery 434 can be charged with power even when the portable device 4 is not vibrated. Therefore, battery exhaustion can be suppressed. Further, since the portable device 4 includes the switch 48, it is possible to suppress the power charged in the battery 434 from leaking to the vibration power generation device 44 and the wireless charging device 46 side.

  In the above embodiment, the switch 48 may be omitted. This also allows the battery 434 to be charged with power from both the vibration power generation device 44 and the wireless charging device 46. Further, by omitting the switch 48, the configuration and processing of the portable device 4 can be simplified. In this case, the processing of S11, S13, S15, and S16 can be omitted in FIG.

(Second Embodiment)
Next, a second embodiment of the portable device according to the present invention will be described with a focus on differences from the first embodiment. FIG. 11 shows the configuration of the portable device 4 of the present embodiment. In FIG. 11, the same reference numerals are given to the same or similar components as those in the first embodiment. In FIG. 11, the communication circuit 41 and the control unit 42 of FIG. 5 are illustrated as one load. In addition, the vehicle equipment of this embodiment is the same as the vehicle equipment 5 (refer FIG. 1) of 1st Embodiment. As shown in FIG. 11, the portable device 4 includes a vibration power generation device 44, a voltage dividing circuit 49, a wireless charging device 46, a rectifier circuit 7, a battery 434, and loads 41 and 42. The vibration power generation device 44, the battery 434, and the loads 41 and 42 are not changed from the first embodiment.

  In the present embodiment, the voltage dividing circuit 49 is composed of capacitors 493 and 494, the capacitor 494 is also used as a resonance capacitor of the wireless charging device 46, and the rectifier circuit 7 is connected to the vibration power generation device 44. It is characterized by performing both rectification of power and rectification of power from the wireless charging device 46.

  Specifically, the path 61 connected to the vibration power generation device 44 and the path 641 connected to one end of the antenna coil 461 merge at the junction point 67, and the path 66 after the junction is the positive of the rectifier circuit 7. Side input unit 451. The path 642 connected to the other end of the antenna coil 461 is connected to a ground line 68 connected to the ground, and the ground line 68 is connected to the negative-side input unit 72 of the rectifier circuit 7. The voltage dividing circuit 49 includes a first capacitor 493 disposed in the path 61 and a second capacitor 494 (resonance capacitor) disposed in the path 642. That is, the voltage dividing circuit 49 is a circuit in which two capacitors 493 and 494 are connected in series via the antenna coil 461. The antenna coil 461 and the second capacitor 494 constitute the wireless charging device 46.

  Since the power generation voltage of the vibration power generation device 44 is an AC voltage (see FIG. 7A), the AC voltage can also be divided by the capacitors 493 and 494. Specifically, the impedance of the capacitor is represented by 1 / ωC. Note that ω is an angular velocity and ω = 2πf, and C is a capacitance of the capacitor. Therefore, the AC voltage from the vibration power generation device 44 having the frequency f1 of about 30 Hz is the impedance Z1 of the first capacitor 493 (= 1 / 2πf1C1, C1 is the capacitance of the first capacitor 493) and the impedance of the second capacitor 494. The voltage is divided to a voltage corresponding to the ratio of Z2 (= 1 / 2πf1C2, C2 is the capacitance of the second capacitor 494).

  The capacitances C1 and C2 of the capacitors 493 and 494 are set in consideration of the internal impedance R1 of the vibration power generation device 44, the input impedance of the rectifier circuit 7, and the like. The setting procedure of the capacitances C1 and C2 and the inductance L of the antenna coil 461 will be specifically described. First, the impedance Z2 at the frequency f1 (frequency of the current generated by the vibration power generation device 44) of the second capacitor 494 is determined by the rectifier circuit 7. The capacitance C2 of the second capacitor 494 is set so as to be sufficiently larger than the ON resistance R2 (input impedance). Specifically, when the on-resistance R2 of the rectifier circuit 7 is 30Ω, for example, the impedance Z2 is set to 0.8 MΩ (20 to 30 times larger than the on-resistance 30Ω), for example. Then, the capacitance C2 is set so as to satisfy Z2 = 1 / ωC = 1 / 2πf1C2 = 0.8M. In this case, the capacitance C2 = 1000 pF is set.

  As a result, the alternating current I1 generated by the vibration power generation device 44 flows from the junction 67 to the rectifier circuit 7 having a low impedance. In other words, the leakage current I2 of the alternating current I1 flowing from the junction 67 to the paths 641 and 642 on the antenna coil 461 side can be suppressed. Accordingly, the battery 434 can be efficiently charged with the alternating current I1. Since the antenna coil 461 is used for a high frequency of 13.56 MHz, the antenna coil 461 functions only as a conducting wire (does not function as a coil) for an alternating current I1 of about 30 Hz. Therefore, the magnitude of the leakage current I2 is determined by the impedance Z2 of the second capacitor 494. Also, the alternating current I3 generated by the wireless charging device 46 does not flow through the path 61 on the vibration power generation device 44 side having a high internal impedance R1 (= 15 MΩ) (the leakage current I4 flowing through the path 61 is extremely small). And flows from the junction 67 to the path 66 on the rectifier circuit 7 side. Therefore, the battery 434 can be efficiently charged with the alternating current I3.

  Next, the resonance circuit composed of the antenna coil 461 and the second capacitor 494 resonates at the frequency C2 used for wireless power feeding, that is, the capacitance C2 (= 1000 pF) set so as to resonate at 13.56 MHz. The inductance L of the coil 461 is set. Specifically, the inductance L is set based on the resonance frequency formula of the LC resonance circuit: f = 1 / 2π√LC. In this case, if f is calculated by substituting f = 13.56 MHz and C = 1000 pF into the above equation, L = 0.15 μH. The shape (number of turns, etc.) of the antenna coil 461 is determined so as to satisfy L = 0.15 μH. Thereby, when the antenna coil 461 receives the electromagnetic wave from the wireless power transmission device 55, the antenna coil 461 can generate an alternating current of 13.56 MHz.

  After setting the capacitance C2, next, the capacitance C1 is set so that the impedance of the voltage dividing circuit 49, that is, the combined impedance (Z1 + Z2) of the capacitors 493 and 494 is the same as the internal impedance R1 of the vibration power generation device 44. Specifically, assuming that the internal impedance R1 = 15 MΩ and the impedance Z2 = 0.8 MΩ, the impedance Z1 of the first capacitor 493 is 14.2 MΩ. Therefore, if the capacitance C1 is set so as to satisfy Z1 = 1 / ωC = 1 / 2πf1C1 = 14.2 MΩ, the capacitance C1 = 53 pF. Thereby, the electric power generated by the vibration power generation device 44 can be efficiently transmitted to the circuits (the rectifier circuit 7 and the battery 434) after the voltage dividing circuit 49.

  The rectifier circuit 7 is a full-wave rectifier circuit in which four diodes 70 are bridge-connected, and rectifies an input alternating current into a direct current. The positive side output unit 73 of the rectifier circuit 7 is connected to the positive side of the battery 434 and the loads 41 and 42. The negative output section 74 of the rectifier circuit 7 is connected to the negative side (ground) of the battery 434 and the loads 41 and 42. A current I1 generated by the vibration power generation device 44 and a current I3 generated by the wireless charging device 46 flow through the path 66 connected to the input unit 71 on the positive side. Here, FIG. 12 illustrates the time change of the current flowing through the path 66. In FIG. 12, the vertical axis represents current and the horizontal axis represents time. In FIG. 12, a waveform 141 indicates a time change of the alternating current I1, a waveform 142 indicates a time change of the alternating current I3, and a waveform 145 indicates a waveform obtained by synthesizing the waveforms 141 and 142.

  When the vibration power generation device 44 generates power and there is no wireless power feeding, the current I1 indicated by the waveform 141 flows through the path 66. The current I1 is rectified by the rectifier circuit 7, and the rectified power is charged in the battery 434. On the other hand, when there is no power generation of the vibration power generation device 44 and there is wireless power feeding, the current I3 indicated by the waveform 142 flows through the path 66. The current I3 is rectified by the rectifier circuit 7, and the battery 434 is charged with the rectified power. On the other hand, when both the power generation of the vibration power generation device 44 and wireless power feeding are present, the current (I1 + I3) indicated by the waveform 145 flows through the path 66. The current (I1 + I3) is rectified by the rectifier circuit 7, and the rectified power is charged in the battery 434. Thus, in the present embodiment, charging by the vibration power generation device 44 and charging by the wireless charging device 46 can be performed simultaneously.

  For example, the control unit 42 executes processing in which S11, S13, S15, and S16 are omitted in FIG. That is, when the power generation by the vibration power generation device 44 is insufficient (S12: Yes), an instruction signal instructing execution of wireless power feeding is transmitted to the vehicle-mounted device 5 (S14). Thereby, even when no vibration is applied to the portable device 4, the battery 434 can be charged with electric power.

  As described above, according to the portable device 4 of the present embodiment, both the current of the vibration power generation device 44 and the current of the wireless charging device 46 are rectified by the single rectifier circuit 7, so that the rectifier circuits are separately provided. Compared with the case of providing, the portable device 4 can be downsized (the configuration of the portable device 4 can be simplified). Further, since the second capacitor 494 of the voltage dividing circuit 49 is also used as the resonance capacitor of the wireless charging device 46, the portable device 4 can be downsized compared to the case where the voltage dividing capacitor and the resonance capacitor are provided separately. it can.

  In addition, this invention is not limited to the said embodiment, A various change is possible to the limit which does not deviate from description of a claim. For example, in the above-described embodiment, an example in which a vibration power generation device using an electret material is described has been described. Also good. In the above embodiment, the in-vehicle device performs wireless power feeding based on an instruction signal from the portable device. However, a sensor (for example, a portable device) that detects that the portable device is placed at a predetermined power feeding location. A weight sensor for detecting weight) may be provided at a power feeding location, and wireless power feeding may be performed based on a detection signal of the sensor. Further, a switch that instructs execution of wireless power feeding may be provided in the vehicle, and wireless power feeding may be performed based on the operation of the switch by the user. Moreover, the wireless power transmission apparatus may be provided in a place other than the vehicle (for example, the user's home). In this case, for example, the wireless power transmission device detects that the portable device is located at a place where the wireless power transmission device is installed by a sensor or switch operation, and performs wireless power feeding.

  In the above embodiment, the control unit 42 and the communication circuit 41 correspond to “communication means” of the present invention. The vibration power generation device 44 corresponds to the “vibration power generation means” of the present invention. The wireless charging device 46 corresponds to the “power receiving means” of the present invention. The wireless power transmission device 55 corresponds to the “power transmission means” of the present invention. The battery 434 corresponds to the “power storage unit” of the present invention. The paths 61, 62, 621, and 63 in FIG. 5 correspond to the “first path” of the present invention. The paths 64 and 65 in FIG. 5 correspond to the “second path” of the present invention. The switch 48 corresponds to the “switching means” of the present invention. The control unit 42 that executes the process of S15 of FIG. 8 corresponds to the “power reception determination unit” of the present invention. The control unit 42 that executes the processes of S11, S13, and S16 in FIG. 8 corresponds to the “switching control unit” of the present invention. The control unit 42 that executes the process of S12 in FIG. 8 corresponds to the “power generation determination unit” of the present invention. The rectifier circuit 7 of FIG. 11 corresponds to the “shared conversion means” of the present invention. Capacitors 493 and 494 correspond to the “voltage dividing capacitor” of the present invention. The voltage dividing circuit 49 corresponds to the “voltage dividing means” of the present invention. The path 61 in FIG. 11 corresponds to the “vibration power generation side path” of the present invention. The path 641 in FIG. 11 corresponds to the “antenna side path” of the present invention. A path 66 in FIG. 11 corresponds to a “merging path” of the present invention.

DESCRIPTION OF SYMBOLS 4 Portable machine 41 Communication circuit 42 Control part 434 Battery 44 Vibration power generation device 46 Wireless charging device 461 Antenna coil 462 Resonance capacitor 45, 47, 7 Rectifier circuit 48 Switch 49 Voltage dividing circuit 493, 494 Capacitor 5 Car-mounted machine 55 Wireless power transmission apparatus

Claims (8)

A portable device comprising a communication means that is carried by a user of the vehicle and wirelessly communicates with an in-vehicle device mounted on the vehicle,
Vibration power generation means for generating power by vibrating the portable device;
Power receiving means for receiving power from a power transmitting means for transmitting power wirelessly;
A power storage means connected to both the vibration power generation means and the power reception means, for storing the power generated by the vibration power generation means and the power received by the power reception means as power for driving the communication means; A portable device characterized by comprising. The internal impedance of the vibration power generation means is higher than the internal impedance of the power reception means,
Switching means for switching between conduction and disconnection of the first path between the vibration power generation means and the power storage means, and switching between conduction and disconnection of the second path between the power reception means and the power storage means;
Power receiving determination means for determining whether or not power is received by the power receiving means;
A switching control means for controlling the switching means so that the first path is conducted and the second path is disconnected when the power reception determining means determines that there is no power reception by the power receiving means. The portable device according to claim 1. Power generation determination means for determining the presence or absence of power generation by the vibration power generation means,
The power transmission means is provided in the in-vehicle device,
When the power generation determination unit determines that the vibration power generation unit does not generate power, the communication unit transmits an instruction signal instructing execution of power transmission by the power transmission unit to the in-vehicle device,
3. The switch control unit according to claim 2, wherein the switch control unit controls the switch unit so as to make the second path conductive when the power generation determination unit determines that there is no power generation by the vibration power generation unit. Portable machine. The vibration power generation means performs AC power generation when the portable device is vibrated,
The power receiving means receives power from the power transmitting means as AC power,
An input unit connected to both the vibration power generation unit and the power reception unit, and an output unit connected to the power storage unit, and converts the AC power input to the input unit into DC power and outputs the output A shared conversion means for outputting to the
The portable device according to any one of claims 1 to 3, wherein the power storage unit stores DC power output from the output unit. A voltage dividing means arranged between the vibration power generation means and the shared conversion means, including a voltage dividing capacitor, and voltage dividing means for dividing the voltage of the AC power generated by the vibration power generation means with the voltage dividing capacitor;
The shared conversion means converts the AC power of the voltage divided by the voltage dividing means into DC power,
The power transmission means transmits an electromagnetic wave for power generation at a predetermined power supply frequency,
The power receiving means includes an antenna coil that receives the electromagnetic wave, and a resonance capacitor that forms a resonance circuit that resonates with the antenna coil at the feeding frequency, and the resonance circuit receives the electromagnetic wave when the antenna coil receives the electromagnetic wave. To generate AC power at the power supply frequency,
The portable device according to claim 4, wherein the resonance capacitor is also used as the voltage dividing capacitor.   Assuming that AC power having a predetermined vibration power generation frequency is generated from the vibration power generation means, the voltage dividing means at the vibration power generation frequency has the same impedance as the internal impedance of the vibration power generation means. 6. The portable device according to claim 5, wherein a capacitance of the pressure capacitor is set. The vibration power generation side path through which the alternating current generated by the vibration power generation means is connected to the vibration power generation means and the antenna side path through which the AC current received by the power reception means is connected in the middle. Then, the merge path that is the path after the merge is connected to the shared conversion means,
7. The portable device according to claim 6, wherein a capacitance of the resonance capacitor is set so that an impedance of the resonance capacitor at the vibration power generation frequency is higher than an input impedance of the shared conversion unit. 8. The portable device according to claim 7, wherein the internal impedance of the vibration power generation means is a high impedance value that prevents an alternating current from the antenna side path from flowing into the vibration power generation side path.