Electronic devices and electrical equipment

Abstract

To provide electronic devices, electrical equipment, and data transmission devices that can reduce the effort required when writing data to electronic devices. [Solution] The electronic device 10 comprises a charging circuit 11, a data conversion circuit 12, an arithmetic circuit 13, a non-volatile memory 14, and a data writing circuit 15. The electronic device 10 comprises a first power supply circuit 18 that supplies power to the arithmetic circuit 13, and a second power supply circuit 19 that supplies power to the data conversion circuit 12 and the data writing circuit 15 using energy stored in the energy storage device 27. The charging circuit 11 charges the energy storage device 27 with power based on a signal of a first frequency. The data writing circuit 15 operates based on the power supply from the second power supply circuit 19 and writes the digital signal formed by the data conversion circuit 12 directly or indirectly to the non-volatile memory 14.

Description

Technical Field

[0001] The present disclosure relates to electronic devices, And, electrical In a bowl equipment.

Background Art

[0002] As one of the technologies for updating data held by electrical equipment, the technology described in Patent Document 1 is known. In the technology described in Patent Document 1, an adapter is arranged in an indoor unit. The adapter receives a program from a server device and controls an air conditioner based on the program. The adapter has a storage unit having a plurality of storage areas into which the program is written and a control unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the technology described in Patent Document 1, data update work is performed in the situation where the electrical equipment and the adapter operate.

[0005] By the way, in a situation where power is not supplied to the electrical equipment or it is difficult to supply power, it may be necessary to write data to an electronic device in the electrical equipment. In such a case, it is necessary to prepare a power supply facility for supplying power to the electrical equipment. Then, it is necessary to connect the power supply facility and the electrical equipment, and then confirm that the electronic device in the electrical equipment operates. Thus, it takes time to write data to the electronic device.

Means for Solving the Problems

[0006] An electronic device according to the first aspect of solving this problem comprises a charging circuit, a data conversion circuit, an arithmetic circuit, a non-volatile memory, and a data writing circuit, wherein the electronic device comprises a first power supply terminal to which a power supply for supplying power to the electronic device is connected and a second power supply terminal to which an energy storage device is connected, a first power supply circuit connected to the first power supply terminal and supplying power to the arithmetic circuit, and a second power supply circuit connected to the second power supply terminal and supplying power to the data conversion circuit and the data writing circuit using the energy stored in the energy storage device connected to the second power supply terminal, wherein the arithmetic circuit is The non-volatile memory is accessed when power is supplied from the first power supply circuit, and operation is stopped when no power is supplied from the first power supply circuit. The charging circuit is connected to the antenna circuit and the energy storage device, and charges the energy storage device with power based on a first frequency signal received by the antenna circuit. The data conversion circuit has a first conversion unit that converts a second frequency signal received by the antenna circuit into a digital signal. The data writing circuit operates based on the power supply from the second power supply circuit and writes the digital signal formed by the data conversion circuit directly or indirectly to the non-volatile memory.

[0007] This configuration allows data to be written to the non-volatile memory of an electronic device without connecting power and signal lines to the device. This reduces the effort required when writing data to an electronic device.

[0008] In the electronic device of the second aspect, the frequency difference between the first frequency and the second frequency is set such that, in the case of simultaneous reception where the first frequency and the second frequency pass through the data conversion circuit at the same time, the noise ratio of the signal of the second frequency is greater than or equal to a predetermined value.

[0009] With this configuration, the data conversion circuit makes it easier to extract the second frequency signal when both the first and second frequencies pass through the data conversion circuit simultaneously, thus making it easier to extract data from the simultaneously received signals. Here, the noise ratio of the second frequency signal represents the signal strength of the second frequency relative to the signal strength of the noise.

[0010] The electronic device in the third view is one in which the antenna circuit in the electronic device in the first or second view consists of only one antenna circuit.

[0011] In this configuration, the electronic device receives signals of a first frequency and a second frequency from an antenna circuit consisting of only one antenna circuit.

[0012] The electronic device of the fourth aspect is an electronic device of the first or second aspect in which the antenna circuit comprises a first antenna circuit that receives a signal of the first frequency and a second antenna circuit that receives a signal of the second frequency.

[0013] With this configuration, the first antenna circuit for receiving signals of the first frequency and the second antenna circuit for receiving signals of the second frequency are configured separately, thus improving the reception sensitivity of both the first frequency and the second frequency signals.

[0014] The electronic device of the fifth aspect is one of the electronic devices of the first to fourth aspects, wherein the energy storage device has an electrical capacity greater than or equal to the amount of writing electricity required for the writing operation to the non-volatile memory. With this configuration, writing to the non-volatile memory can be performed.

[0015] The sixth aspect of the electronic device is one of the first to fifth aspects of the electronic device, wherein the data conversion circuit further includes a second conversion unit that converts a digital signal containing first information into an analog signal for transmission from the antenna circuit. With this configuration, the electronic device can transmit the first information.

[0016] In the seventh aspect of the electronic device, in any one of the first to sixth aspects of the electronic device, the data writing circuit operates the antenna circuit to transmit a transmission signal indicating that data can be written based on the charge level of the energy storage device being equal to or greater than a first threshold corresponding to the amount of electricity to be written. With this configuration, the timing of when data can be written can be communicated to the communication partner. This prevents the communication partner from sending information before the electronic device becomes ready for data writing. In this way, it is possible to prevent writing from starting when there is insufficient power.

[0017] The electronic device of the eighth aspect, in any one of the electronic devices of the first to sixth aspects, operates the antenna circuit so that the data writing circuit transmits a transmission signal indicating a power supply request based on the fact that the charge level of the energy storage device is below a second threshold, which is lower than a first threshold. This configuration makes it possible to suppress interruptions in writing due to insufficient power.

[0018] The electronic device of the ninth aspect is one of the electronic devices of the first to eighth aspects, in which the data conversion circuit has a multiplexed signal separation circuit. With this configuration, the multiplexed signals transmitted by the multiplexed modulation scheme can be separated. This makes it possible to increase the amount of signal that can be received.

[0019] The electronic device of the tenth aspect further comprises a temporary storage memory in any one of the electronic devices of the first to tenth aspects, wherein the non-volatile memory is configured to allow data to be written and erased in predetermined capacity increments, and the data writing circuit temporarily writes the digital signal formed by the data conversion circuit to the temporary storage memory, and when the size of the data written to the temporary storage memory exceeds the predetermined capacity of the non-volatile memory, the circuit transfers the predetermined capacity of data from the temporary storage memory to the non-volatile memory. This configuration makes it possible to suppress the number of writes to the non-volatile memory.

[0020] The electrical device according to the 11th aspect for solving the above problems includes the electronic device described in any one of the 1st to 10th aspects. According to this configuration, data can be written into the non-volatile memory without connecting a power supply wiring and a signal line to the electronic device.

[0021] The data transmission device according to the 12th aspect for solving the above problems transmits, to the electrical device, the signal of the first frequency for supplying power and the signal of the second frequency for sending information, in a state where power supply is not performed to the electrical device described in the 11th aspect.

[0022] According to this configuration, data can be written into the non-volatile memory of the electronic device in the electrical device without connecting a power supply wiring and a signal line to the electrical device.

Brief Description of Drawings

[0023] [Figure 1] It is a schematic diagram showing a state where the data transmission device and the electrical device perform wireless communication. [Figure 2] It is a schematic diagram of an electronic device. [Figure 3] It is a schematic diagram of a control board on which an electronic device is mounted. [Figure 4] It is a block diagram of an electronic device. [[ID=*26]] [Figure 5] It is a block diagram of a charging circuit. [Figure 6] It is a block diagram of a first conversion unit. [Figure 7] It is a block diagram of a second conversion unit. [Figure 8] It is a block diagram of a data transmission device. [Figure 9] It is a diagram showing a response between the data transmission device and the electronic device. [[ID=4*3]]

Embodiments for Carrying Out the Invention

[0024] Referring to FIGS. 1 to 9, the electrical device 1, the data transmission device 2, and the electronic device 10 will be described. Note: There seems to be a formatting issue in the original text where the tags and etc. might be part of a specific formatting system not fully clear from the provided text. I've translated them as-is while keeping the tag structure intact. Also, the asterisks (*) are added to the tags in the translation for the ones that seem to have a potential issue or might be part of a non-standard naming convention in the original. If there's more context available for these tags, it would be beneficial for a more accurate translation. The electrical equipment 1 includes an electronic device 10 according to this embodiment. The electrical equipment 1 operates based on control information stored in the electronic device 10. The control information includes a program for operating the electrical equipment 1 and various parameters for operating the electrical equipment 1. Examples of the electrical equipment 1 include air conditioners, water heaters, chiller units, and cooling devices. A cooling device is a device that cools the air inside a storage area. Examples of air conditioners include cooling-only units, heating-only units, and air conditioning / heating units that switch between cooling and heating. Examples of cooling devices include refrigerators, freezers, refrigerated display cases, and refrigerated containers.

[0025] Electrical equipment 1 is connected to the commercial power supply. Electrical equipment 1 operates using the power from the commercial power supply. The electronic device 10 within electrical equipment 1 operates using the power from the commercial power supply. The operating parts of electrical equipment 1 operate according to commands from the electronic device 10. Taking the outdoor unit of an air conditioner as an example, the operating parts include the compressor, fan, various sensors, etc.

[0026] Electrical device 1 communicates with data transmission device 2 when it is not supplied with power from the commercial power source.

[0027] In the first example, the data transmission device 2 communicates with the electrical equipment 1 during the manufacturing process of the electrical equipment 1. Specifically, in the installation process where the electronic device 10 stores control information (see below) in the assembled state after each component has been assembled during the manufacturing of the electrical equipment 1, the data transmission device 2 communicates with the electrical equipment 1. At this time, the data transmission device 2 transmits the control information to the electrical equipment 1. The electronic device 10 of the electrical equipment 1 receives the information via an antenna. In the manufacturing line, it is time-consuming to connect the power supply 3 to the electrical equipment 1 or to connect a data communication cable to the electrical equipment 1. To reduce this time-consuming process, the data transmission device 2 transmits information wirelessly to the electrical equipment 1 when the electrical equipment 1 is not receiving power.

[0028] Figure 1 shows a diagram illustrating the communication between electrical equipment 1 and data transmission device 2 in the first example. In Figure 1, an outdoor unit is shown as an example of electrical equipment 1. In the outdoor unit, a control board 29 is housed in a control box. The electronic device 10 is mounted on the control board 29. When writing information to the electronic device 10, power does not need to be supplied to electrical equipment 1. When writing information to the electronic device 10, the data transmission device 2 transmits the information with the housing 1A of electrical equipment 1 open. As a result, the information is written to the electronic device 10.

[0029] In the second example, after the sale of electrical equipment 1, while electrical equipment 1 is installed in the building, the data transmission device 2 communicates with electrical equipment 1. Specifically, when updating the control information (see below) of the electronic device 10 as part of maintenance on electrical equipment 1 installed in the building, the data transmission device 2 communicates with electrical equipment 1. At this time, the data transmission device 2 transmits the new control information to electrical equipment 1. The electronic device 10 of electrical equipment 1 receives the control information via an antenna. Maintenance of electrical equipment 1 is performed when electrical equipment 1 is not in use. Therefore, during the maintenance period, power may not be supplied to electrical equipment 1 from the building's power line. In such cases, it is troublesome to request power supply to electrical equipment 1 from the building manager. Therefore, to improve maintenance efficiency, the data transmission device 2 transmits information wirelessly to electrical equipment 1 when power is not supplied to electrical equipment 1.

[0030] The data transmission device 2 can take various forms. In the first example, the data transmission device 2 is configured as a desktop device. Alternatively, the data transmission device 2 may be built into an inspection device used in the manufacturing process of the electrical equipment 1. In the second example, the data transmission device 2 is configured to be portable so that it can be easily carried by maintenance workers. For example, the data transmission device 2 is configured as a device connected to a tablet computer.

[0031] [Electronic devices] As shown in Figure 4, the electronic device 10 includes a charging circuit 11, a data conversion circuit 12, an arithmetic circuit 13, a non-volatile memory 14, and a data writing circuit 15. The electronic device 10 further includes a first power supply terminal 16, a second power supply terminal 17, a first power supply circuit 18, and a second power supply circuit 19. The electronic device 10 includes a signal terminal 23B to which the arithmetic circuit 13 is connected, and an antenna signal terminal 23A to which the antenna circuit 24 is connected. The electronic device 10 further includes a temporary storage memory 21. The electronic device 10 further includes a functional block 22. The functional block 22 is provided in accordance with each of the various functions of the electrical equipment 1. The functional block 22 is a circuit for operating the functions of the electrical equipment 1. The functions of the electrical equipment 1 include the operating parts described above. One of the functional blocks 22 is configured as a circuit for performing the function of a compressor. The functional block 22 and the non-volatile memory 14 are connected to the arithmetic circuit 13 via the bus 20 (see Figure 4).

[0032] As shown in Figure 2, the electronic device 10 comprises a semiconductor chip 10A, a base member 10B on which the semiconductor chip 10A is mounted, and a sealing resin 10C for molding the semiconductor chip 10A. The semiconductor chip 10A is configured as an ASIC (application specific integrated circuit). The semiconductor chip 10A may be configured as a CPLD (Complex Programmable Logic Device), an ASSP (Application Specific Standard Product), or an FPFG (Field Programmable Gate Array). The semiconductor chip 10A has a charging circuit 11, a data conversion circuit 12, an arithmetic circuit 13, a non-volatile memory 14, a data writing circuit 15, a first power supply circuit 18, a second power supply circuit 19, a bus 20, a temporary storage memory 21, and a functional block 22. The base member 10B is a lead frame or a wiring board. The base member 10B has a first power supply terminal 16 and a second power supply terminal 17.

[0033] As shown in Figure 3, the electronic device 10 is mounted on the control board 29. The control board 29 has an antenna circuit 24 and a power storage device 27 mounted on it. The antenna circuit 24 may be formed on the control board 29 by wiring.

[0034] The electronic device 10 operates in different ways depending on how it receives power. Specifically, the electronic device 10 operates in at least a first mode and a second mode.

[0035] The operation of the first embodiment of the electronic device 10 is as follows: The electronic device 10 operates by the operation of the arithmetic circuit 13 when power is supplied to the first power supply terminal 16. The state in which power is supplied to the first power supply terminal 16 is the state in which the electrical equipment 1 is connected to a commercial power supply or an emergency power supply. At this time, the arithmetic circuit 13 operates based on control information stored in the non-volatile memory 14.

[0036] The operation of the electronic device 10 in its second mode is as follows: When power is supplied to the second power supply terminal 17, the electronic device 10 operates through the operation of the data writing circuit 15. At this time, the arithmetic circuit 13 is not operating. In contrast, the data writing circuit 15 writes the information acquired wirelessly to the non-volatile memory 14. In short, the operation of the electronic device 10 in its second mode corresponds to the operation when information is written to the non-volatile memory 14 within the electronic device 10 while the electronic device 10 is unpowered. Note that "the electronic device 10 is unpowered" or "the electronic device 10 is unpowered" as described later refers to the state of the electronic device 10 when power is not being supplied from the first power supply terminal 16.

[0037] [Configuration of electronic devices] Referring to Figure 4, the components of the electronic device 10 and the devices connected to the electronic device 10 will be described. In Figure 4, solid lines indicate wiring that carries power. Dashed lines indicate wiring that carries signals. In contrast, in Figures 5 to 8, solid lines indicate wiring that carries signals.

[0038] [First power supply terminal] The first power supply terminal 16 is a terminal connected to a power supply 3 that supplies power to the electronic device 10. The power supply 3 forms a DC power supply from the commercial power supply and then supplies the DC power supply to the electronic device 10.

[0039] [Second power supply terminal] The second power supply terminal 17 is the terminal to which the energy storage device 27 is connected. The energy storage device 27 is charged by power supplied wirelessly. Specifically, the energy storage device 27 is charged by power based on a signal of a first frequency (see below). The energy storage device 27 may also be charged by means other than wireless. For example, when commercial power is connected to the electrical equipment 1, the energy storage device 27 may be charged based on the power of the commercial power supply. When the energy storage device 27 is charged, the time required for wireless power supply can be reduced when updating control information.

[0040] [Energy storage devices] The energy storage device 27 stores energy necessary to perform write operations to the non-volatile memory 14 when the electronic device 10 is in an unpowered state. The energy storage device 27 is composed of a secondary battery, a capacitor, and the like.

[0041] The energy storage device 27 is connected to the electronic device 10. As described above, the energy storage device 27 is provided on the control board 29. The energy storage device 27 has an electrical capacity greater than or equal to the amount of writing electricity required for writing operations to the non-volatile memory 14. The amount of writing electricity varies depending on the amount of data information to be written to the non-volatile memory 14. The amount of writing electricity may be set according to the amount of information to be written to the non-volatile memory 14 or the number of write operations.

[0042] [1st power supply circuit] The first power supply circuit 18 is connected to the first power supply terminal 16. The first power supply circuit 18 forms a stable voltage power supply based on the power supplied from the first power supply terminal 16. The first power supply circuit 18 then supplies power to the arithmetic circuit 13. Specifically, the first power supply circuit 18 supplies the power supply voltage it has formed to the arithmetic circuit 13 and the functional block 22.

[0043] [Second power supply circuit] The second power supply circuit 19 is connected to the second power supply terminal 17. The second power supply circuit 19 supplies power to the data conversion circuit 12 and the data writing circuit 15 using the energy stored in the energy storage device 27 connected to the second power supply terminal 17. The second power supply circuit 19 also supplies power to the temporary storage memory 21 and the non-volatile memory 14 using the energy stored in the energy storage device 27 connected to the second power supply terminal 17.

[0044] Specifically, the second power supply circuit 19 forms a stable power supply voltage using the power discharged from the energy storage device 27. The power supply voltage formed by the second power supply circuit 19 may be equal to or different from the power supply voltage formed by the first power supply circuit 18.

[0045] The second power supply circuit 19 acquires the terminal voltage of the energy storage device 27. In one example, the second power supply circuit 19 acquires the terminal voltage of the energy storage device 27 by acquiring the potential at the connection point between the second power supply circuit 19 and the energy storage device 27. The second power supply circuit 19 sends the terminal voltage of the energy storage device 27 to the data writing circuit 15. In the data writing circuit 15, the terminal voltage of the energy storage device 27 is used to detect the charge state of the energy storage device 27.

[0046] [Antenna circuit] The antenna circuit 24 is connected to the electronic device 10. As described above, the antenna circuit 24 is provided on the control board 29. The antenna circuit 24 comprises a first antenna circuit 25 and a second antenna circuit 26. The first antenna circuit 25 receives a signal of a first frequency. The second antenna circuit 26 receives a signal of a second frequency. The antenna circuit 24 may consist of only one antenna circuit 24. If the antenna circuit 24 consists of one antenna circuit 24, the antenna circuit 24 is configured to receive signals of a first frequency and signals of a second frequency. Alternatively, if the second frequency is equal to the first frequency, the antenna circuit 24 consists of one antenna circuit 24.

[0047] The frequency difference between the first frequency and the second frequency is preferably set such that, in the case of simultaneous reception where both the first and second frequencies pass through the data conversion circuit 12 at the same time, the noise ratio of the signal of the second frequency is greater than or equal to a predetermined value. In one example, the noise ratio of the signal of the second frequency processed by the first conversion unit 40 is 4 dB or more.

[0048] When a second-frequency signal is processed by the first conversion unit 40, the following problems arise. When the frequency difference between the first frequency and the second frequency is small, the second bandpass filter 41 (see below) that passes the second frequency does not remove the signal component of the first frequency, and there is a high possibility that the signal component of the first frequency will pass through the second bandpass filter 41. In this case, the signal component of the first frequency becomes an interfering component to the signal of the second frequency. At this time, because the AGC circuit 42 of the first conversion unit 40 processes the signal not only according to the magnitude of the second-frequency signal but also the interfering component, the noise may become relatively large with respect to the second-frequency signal. In this case, it becomes difficult to obtain a sufficient noise ratio for the second-frequency signal. As a result, there is a higher possibility of errors occurring in the digital signal formed based on the second-frequency signal. In short, when there is a signal of another frequency near the second frequency, the signal of the other frequency becomes an interfering component, and the processing by the AGC circuit 42 reduces the noise ratio of the second-frequency signal. For this reason, as described above, the frequency difference between the first frequency and the second frequency is set such that the noise ratio of the signal at the second frequency is greater than or equal to a predetermined value.

[0049] The first and second frequencies are set to frequencies in the LF or HF band used for electromagnetic induction communication. For example, the first and second frequencies are set to frequencies in the longwave band below 135 kHz.

[0050] The first and second frequencies may be set to frequencies below 550 kHz, which are used for electromagnetically coupled communications. The first and second frequencies may be set to frequencies in the UHF band. The first and second frequencies may be set to frequencies in the microwave band. The frequency band of the second frequency may be different from or the same as the frequency band of the first frequency.

[0051] [Arithmetic circuit] The arithmetic circuit 13 accesses the non-volatile memory 14 when power is supplied from the first power supply circuit 18. Power supply from the first power supply circuit 18 indicates that power voltage is supplied from the first power supply circuit 18 to the arithmetic circuit 13 and the non-volatile memory 14. The arithmetic circuit 13 stops operating when no power is supplied from the first power supply circuit 18.

[0052] When the arithmetic circuit 13 receives power supply voltage from the first power supply circuit 18, it reads control information stored in the non-volatile memory 14. The arithmetic circuit 13 then operates the function block 22 based on the control information. The arithmetic circuit 13 transmits signals received from the operating unit corresponding to the function block 22 to the function block 22. The arithmetic circuit 13 also transmits the response signals of the function block 22 to the operating unit corresponding to the function block 22.

[0053] The operation of the arithmetic circuit 13 described above is related to the operation of the first embodiment of the electronic device 10. That is, the operation of the first embodiment of the electronic device 10 is associated with the operation of the arithmetic circuit 13.

[0054] [Charging circuit] The charging circuit 11 is connected to the antenna circuit 24. The charging circuit 11 is connected to the energy storage device 27. The charging circuit 11 charges the energy storage device 27 with power based on a first frequency signal received by the antenna circuit 24.

[0055] As shown in Figure 5, the charging circuit 11 comprises a first bandpass filter 31 (labeled "first BPF" in Figure 5), a rectifier circuit 32, and a DC-DC circuit 33. The first bandpass filter 31 passes the signal component of a first frequency from the signal sent from the antenna circuit 24. The rectifier circuit 32 rectifies the signal of the first frequency component. The DC-DC circuit 33 converts the rectified signal into a DC signal of a predetermined voltage. The energy storage device 27 is charged by the DC signal of the predetermined voltage.

[0056] [Non-volatile memory] The non-volatile memory 14 retains written information when no power is supplied. When power is supplied, the non-volatile memory 14 transitions to a state where information can be written. When power is supplied, the non-volatile memory 14 is configured to allow data to be written and erased in predetermined capacity increments. Hereinafter, the predetermined capacity will be referred to as the "data batch processing capacity". The non-volatile memory 14 is composed of EEPROM (Electrically E-rasable Programmable Read-Only Memory), flash memory, etc.

[0057] [Temporary storage memory] The temporary storage memory 21 temporarily stores data. The temporary storage memory 21 retains information when power is supplied. The information in the temporary storage memory 21 is erased when power is not supplied. The temporary storage memory 21 is composed of RAM (Random Access Memory), magnetoresistive RAM (also called MRAM), resistive random-access memory (also called ReRAM), etc.

[0058] The temporary storage memory 21 holds information when powered by the second power supply circuit 19. The temporary storage memory 21 operates based on commands from the data writing circuit 15. When powered, the temporary storage memory 21 temporarily stores signals converted by the data conversion circuit 12 (described later) based on temporary storage commands from the data writing circuit 15. When powered, the temporary storage memory 21 transfers the information temporarily stored in the temporary storage memory 21 to the non-volatile memory 14 based on transfer commands from the data writing circuit 15.

[0059] [Data conversion circuit] The data conversion circuit 12 includes a first conversion unit 40 and a second conversion unit 46. In transmitting and receiving information, the data conversion circuit 12 converts information from a digital signal to an analog signal and from an analog signal to a digital signal.

[0060] [First Conversion Section] The first conversion unit 40 converts the second frequency signal received by the antenna circuit 24 into a digital signal.

[0061] As shown in Figure 6, the first conversion unit 40 comprises a second bandpass filter 41 (labeled "second BPF" in Figure 6), an AGC circuit 42, a demodulation circuit 43, and an AD conversion circuit 44. The second bandpass filter 41 passes the signal component of the second frequency from the signal sent from the antenna circuit 24. The AGC circuit 42 performs gain adjustment of the signal so that the signal can be received at the optimal gain for the demodulation circuit 43 located after the AGC circuit 42. The AGC circuit 42 is a type of amplifier circuit. Specifically, the AGC circuit 42 adjusts the signal that has passed through the second bandpass filter 41 so that the amplitude level of the signal is at the optimal amplitude level for demodulation processing.

[0062] The demodulation circuit 43 extracts a second-frequency signal from the carrier wave. The AD conversion circuit 44 converts the demodulated second-frequency signal into a digital signal.

[0063] [Second Conversion Section] The second conversion unit 46 converts the digital signal containing the first information into an analog signal for transmission from the antenna circuit 24. The first information is information to be conveyed to the data transmission device 2. An example of the first information is data request information that requests the data transmission device 2 to send information. Another example of the first information is power request information that requests power. Furthermore, another example of the first information is information indicating that the charge level of the energy storage device 27 for data writing is sufficient, which is data writable information.

[0064] The second conversion unit 46 operates based on commands from the data writing circuit 15. Based on commands from the data writing circuit 15, the second conversion unit 46 converts a digital signal containing data request information into an analog signal. The data request information is held in an internal register in the data writing circuit 15.

[0065] Furthermore, the second conversion unit 46 converts a digital signal containing information indicating that data can be written to an analog signal based on a command from the data writing circuit 15. The information indicating that data can be written to is formed by the data writing circuit 15 based on the charge level of the energy storage device 27.

[0066] As shown in Figure 7, the second conversion unit 46 comprises a DA conversion circuit 47 and a modulation circuit 48. The DA conversion circuit 47 converts a digital signal containing first information into an analog signal of a second frequency. The modulation circuit 48 modulates the analog signal of the second frequency formed by the DA conversion circuit 47. Specifically, the modulation circuit 48 performs the process of superimposing the analog signal of the second frequency onto the carrier wave.

[0067] The data conversion circuit 12 may further include a multiplexed signal separation circuit 12A. When the second frequency signal is a multiplexed signal, the data conversion circuit 12 includes a multiplexed signal separation circuit 12A. Examples of multiplexing include frequency division multiplexing and spread spectrum.

[0068] [Data writing circuit] The data writing circuit 15 operates based on the power supply from the second power supply circuit 19. The data writing circuit 15 directly or indirectly writes the digital signal formed by the data conversion circuit 12 to the non-volatile memory 14. One example of indirectly writing information to the non-volatile memory 14 is to temporarily write the information to the temporary storage memory 21, and then transfer the information from the temporary storage memory 21 to the non-volatile memory 14.

[0069] The data writing circuit 15 starts up when it receives power from the second power supply circuit 19. The data writing circuit 15 does not operate when it does not receive power from the second power supply circuit 19. Therefore, the data writing circuit 15 does not operate when power is being supplied from the first power supply terminal 16.

[0070] The data writing circuit 15 obtains the terminal voltage of the energy storage device 27 from the second power supply circuit 19. The data writing circuit 15 uses the terminal voltage of the energy storage device 27 as a parameter indicating the charge level of the energy storage device 27.

[0071] (Operation A) The data writing circuit 15 operates the antenna circuit 24 to transmit a transmission signal containing information indicating that data can be written, based on the fact that the charge amount of the energy storage device 27 is equal to or greater than a first threshold corresponding to the amount of electricity to be written.

[0072] The first threshold is a value set based on the amount of electricity written. It is set as a value corresponding to the amount of electricity written, which is equivalent to the energy required to perform the process of writing data to the non-volatile memory 14. The first threshold is determined as a value that can be compared with the terminal voltage of the energy storage device 27. The first threshold corresponds to the magnitude of the amount of electricity written. That is, the first threshold has a value corresponding to the magnitude of the amount of electricity written. To ensure that writing is performed reliably, the first threshold is set to a value that is a predetermined percentage greater than the amount of electricity written. The predetermined percentage is, for example, 10%.

[0073] The data writing circuit 15 determines whether the charge amount of the energy storage device 27 is equal to or greater than the first threshold corresponding to the amount of electricity to be written by comparing the terminal voltage, which is the charge amount of the energy storage device 27, with a first threshold.

[0074] If the charge level of the energy storage device 27 is equal to or greater than a first threshold corresponding to the amount of electricity to be written, the data writing circuit 15 generates a transmission signal indicating that data can be written to the non-volatile memory 14. The transmission signal includes the first information described above. Here, the first information is data request information that requests the data transmission device 2 to send information.

[0075] The data writing circuit 15 sends the transmission signal to the DA conversion circuit 47 of the second conversion unit 46. The DA conversion circuit 47 then converts the transmission signal into an analog signal. The converted signal is modulated by the modulation circuit 48 and then sent to the antenna circuit 24. The antenna circuit 24 transmits the signal received from the modulation circuit 48 of the second conversion unit 46 wirelessly. Based on receiving the transmission signal, the data transmission device 2 transmits information to be written to the non-volatile memory 14. In this way, the electronic device 10 can receive information to be written to the non-volatile memory 14 from the data transmission device 2.

[0076] (Operation B) The data writing circuit 15 operates the antenna circuit 24 to transmit a transmission signal indicating a power supply request, based on the fact that the charge level of the energy storage device 27 is below a second threshold, which is lower than the first threshold.

[0077] Specifically, the data writing circuit 15 determines whether the charge level of the energy storage device 27 is less than or equal to the second threshold corresponding to the amount of electricity to be written by comparing the terminal voltage, which is the charge level of the energy storage device 27, with a second threshold.

[0078] If the charge level of the energy storage device 27 is less than or equal to a second threshold corresponding to the amount of electricity to be written, the data writing circuit 15 forms a transmission signal indicating a power supply request. The transmission signal includes first information, in which case the first information is power request information that requests the data transmission device 2 to send a signal of a first frequency.

[0079] The data writing circuit 15 sends the transmission signal to the DA conversion circuit 47 of the second conversion unit 46. The DA conversion circuit 47 then converts the transmission signal into an analog signal. The converted signal is modulated by the modulation circuit 48 and then sent to the antenna circuit 24. The antenna circuit 24 transmits the signal received from the modulation circuit 48 of the second conversion unit 46 wirelessly. The data transmission device 2 transmits a signal of the first frequency based on receiving the transmission signal. In this way, the electronic device 10 can receive further power to write to the non-volatile memory 14.

[0080] The second threshold value described above is set as a value corresponding to the amount of writing electricity that is near the lower limit of the energy required to perform the process of writing data to the non-volatile memory 14. The second threshold value is determined as a value that can be compared with the terminal voltage of the energy storage device 27.

[0081] (Operation 3) When the antenna circuit 24 of the electronic device 10 receives a signal of the second frequency, the data writing circuit 15 temporarily writes the digital signal formed by the data conversion circuit 12 to the temporary storage memory 21.

[0082] Furthermore, the data writing circuit 15 accesses a predetermined address in the temporary storage memory 21 periodically or irregularly. The predetermined address is the address of the temporary storage memory 21 that corresponds to a predetermined capacity (data batch processing capacity) of the non-volatile memory 14.

[0083] Then, when the data size written to the temporary storage memory 21 exceeds a predetermined capacity (data batch processing capacity) of the non-volatile memory 14, the data writing circuit 15 transfers the predetermined capacity (data batch processing capacity) of data from the temporary storage memory 21 to the non-volatile memory 14.

[0084] [Data transmission device] The data transmission device 2 transmits information to the electrical equipment 1. Specifically, one example of the information is control information.

[0085] When the electrical equipment 1 is not receiving power, the data transmission device 2 transmits a first frequency signal for supplying power and a second frequency signal for sending information to the electrical equipment 1.

[0086] When power is supplied to electrical device 1, the data writing circuit 15 does not operate. Therefore, when the data transmission device 2 sends a first frequency signal to supply power while power is supplied to electrical device 1, it does not receive a signal from the electronic device 10 indicating that data can be written. Consequently, when power is supplied to electrical device 1, the data transmission device 2 does not send a second frequency signal to electrical device 1 for sending information. This prevents the information in the non-volatile memory 14 from being overwritten when the arithmetic circuit 13 is accelerating to the non-volatile memory 14.

[0087] The first and second frequencies are frequencies that the antenna circuit 24 connected to the electronic device 10 can receive.

[0088] Referring to Figure 8, the configuration of the data transmission device 2 will be described. The data transmission device 2 comprises an antenna circuit 51, a power supply transmission unit 52, a data receiving unit 53, a data transmission unit 54, a control unit 55, and an operation unit 56.

[0089] The antenna circuit 51 is connected to the power transmission unit 52, the data transmission unit 54, and the data reception unit 53. The antenna circuit 51 wirelessly transmits signals of a first frequency and signals of a second frequency. The antenna circuit 51 wirelessly receives signals of a second frequency. The antenna circuit 51 may consist of only one antenna circuit 51. If the antenna circuit 51 consists of one antenna circuit 51, the antenna circuit 51 is configured to receive signals of a first frequency and signals of a second frequency. Alternatively, if the second frequency is equal to the first frequency, the antenna circuit 51 consists of one antenna circuit 51.

[0090] The power supply transmission unit 52 includes a power supply circuit 61 and a third bandpass filter 62 (labeled "third BPF" in Figure 8).

[0091] The power supply circuit 61 forms a signal of a first frequency as a power supply signal based on the data transmission start command from the control unit 55. The signal of the first frequency may be formed as a carrier wave. The third bandpass filter 62 passes the signal component of the first frequency from the signal sent from the power supply circuit 61.

[0092] The data receiving unit 53 includes an AD conversion circuit 65, a demodulation circuit 66, and a fourth bandpass filter 67 (labeled "fourth BPF" in Figure 8).

[0093] The fourth bandpass filter 67 allows the second frequency signal component of the signal received from the electronic device 10 to pass through. The demodulation circuit 66 extracts the second frequency signal from the carrier wave. The AD conversion circuit 65 converts the demodulated second frequency signal into a digital signal.

[0094] The data transmission unit 54 includes a DA conversion circuit 71, a modulation circuit 72, and a fifth bandpass filter 73 (labeled "fifth BPF" in Figure 8).

[0095] The DA conversion circuit 71 converts the digital signal, which is to be transmitted, into a second-frequency analog signal. The DA conversion circuit 71 receives the transmission signal from the control unit 55. The transmission signal includes information to be stored in the non-volatile memory 14 of the electronic device 10. An example of the information to be stored in the non-volatile memory 14 of the electronic device 10 is control information. The control information is stored in the storage unit 80 connected to the control unit 55.

[0096] The storage unit 80 may be provided in the data transmission device 2, or it may be provided in an external device different from the data transmission device 2. The storage unit 80 may be provided on a server on a network. The storage unit 80 has a storage medium such as a hard disk, semiconductor memory, optical disk, or magnetic disk.

[0097] The modulation circuit 72 modulates the second frequency analog signal formed by the DA conversion circuit 71. Specifically, the modulation circuit 72 modulates the second frequency analog signal onto the carrier wave. The fifth bandpass filter 73 passes the second frequency signal component of the signal sent from the modulation circuit 72.

[0098] The operation unit 56 is an interface for initiating a transmission operation to send information to the electronic device 10. The control unit 55 starts operating when the operator operates the start button on the operation unit 56.

[0099] The control unit 55 controls the formation and transmission of the transmission signal. The control unit 55 starts operation upon receiving a start command from the operation unit 56. Upon receiving the start command from the operation unit 56, the control unit 55 operates the antenna circuit 51 and the data transmission unit 54 so that they output a signal of the first frequency from the antenna circuit 51 for a predetermined period of time. In this way, the data transmission device 2 provides energy to the electronic device 10 so that the electronic device 10 can perform a write operation.

[0100] Subsequently, the antenna circuit 51 receives a signal containing data request information from the electronic device 10. The control unit 55 then operates the data transmission unit 54 to transmit the information stored in the storage unit 80 to the electronic device 10 based on the data request information. Specifically, the control unit 55 instructs the DA conversion circuit 71 to convert the digital signal of the control information stored in the storage unit 80 into an analog signal based on the data request information. The control unit 55 then modulates the analog signal using the modulation circuit 72 and outputs a transmission signal from the antenna circuit 51 through the fifth bandpass filter 73.

[0101] In this way, the data transmission device 2 transmits information to the electronic device 10, which is in an unpowered state, thereby causing the data writing circuit 15 of the electronic device 10 to perform a write operation to the non-volatile memory 14.

[0102] [Response flow between data transmission device and electronic device] Referring to Figure 9, the response flow between the data transmission device 2 and the electronic device 10 will be explained. Figure 9 shows an example of writing information to the electronic device 10 during the manufacturing process of the electrical equipment 1. In the manufacturing process of the electrical equipment 1, the power supply 3 is not connected to the electrical equipment 1 during the process of writing information to the electronic device 10.

[0103] In step S1, the operator operates the data transmission device 2. Specifically, the operator operates the start button on the operation unit 56, which causes the control unit 55 to start operating. The control unit 55 sends a data transmission start command to the power supply circuit 61. The power supply circuit 61 then forms a signal of the first frequency as a power supply signal based on the data transmission start command from the control unit 55. The signal formed by the power supply circuit 61 is transmitted through the third bandpass filter 62.

[0104] In step S2, the electronic device 10 receives a signal of a first frequency. The signal of the first frequency passes through the charging circuit 11. In the charging circuit 11, the signal of the first frequency passes through the first bandpass filter 31. The signal of the first frequency is then converted into a DC signal by the rectifier circuit 32 and the DC-DC circuit 33. The DC signal is supplied to the energy storage device 27, so the energy storage device 27 is charged. As a result, the amount of charge in the energy storage device 27 gradually increases.

[0105] In step S3, the data writing circuit 15 compares the terminal voltage, which is the charge amount of the energy storage device 27, with a first threshold to determine whether the charge amount of the energy storage device 27 is equal to or greater than the first threshold corresponding to the amount of electricity to be written. If the charge amount of the energy storage device 27 is equal to or greater than the first threshold, the data writing circuit 15 determines that the charge amount of the energy storage device 27 is equal to or greater than the first threshold.

[0106] In step S4, when the data writing circuit 15 determines that the charge level of the energy storage device 27 is equal to or greater than the first threshold, it forms a transmission signal containing data request information. The transmission signal is processed into a transmission signal by the second conversion unit 46. The antenna circuit 24 then transmits the transmission signal processed by the second conversion unit 46 wirelessly.

[0107] In step S5, the data transmission device 2 receives a transmission signal of a second frequency containing data request information from the data receiving unit 53. In step S6, the data transmission device 2 transmits a transmission signal including control information based on the receipt of data request information. Specifically, the control unit 55 converts the information stored in the storage unit 80 into a transmission signal of a second frequency using the data transmission unit 54, based on the data request information. The data transmission device 2 then transmits the transmission signal of a second frequency via the antenna circuit 51.

[0108] In step S7, the antenna circuit 24 of the electronic device 10 receives a signal of the second frequency. Based on this reception, the data writing circuit 15 temporarily writes the digital signal formed by the data conversion circuit 12 to the temporary storage memory 21.

[0109] In step S8, the data writing circuit 15 periodically or irregularly determines whether the size of the data written to the temporary storage memory 21 exceeds a predetermined capacity (data batch processing capacity) of the non-volatile memory 14. The size of the data written to the temporary storage memory 21 gradually increases each time it receives a signal of the second frequency. When the size of the data written to the temporary storage memory 21 exceeds the predetermined capacity (data batch processing capacity) of the non-volatile memory 14, the data writing circuit 15 determines that the data size has exceeded the predetermined capacity (data batch processing capacity) of the non-volatile memory 14.

[0110] In step S9, when the data size exceeds a predetermined capacity (data batch processing capacity) of the non-volatile memory 14, the data writing circuit 15 transfers a predetermined amount of data (data batch processing capacity) from the temporary storage memory 21 to the non-volatile memory 14.

[0111] <Operation of this embodiment> The electronic device 10 includes an arithmetic circuit 13 that operates when power is supplied from the first power supply terminal 16, and a non-volatile memory 14. As a result, when power is supplied from the first power supply terminal 16, the arithmetic circuit 13 operates, and the electronic device 10 operates based on the information stored in the non-volatile memory 14. In short, the electronic device 10 operates based on the information stored in the non-volatile memory 14 when power is supplied from the first power supply terminal 16.

[0112] The electronic device 10 further comprises a charging circuit 11, a data conversion circuit 12, a non-volatile memory 14, a data writing circuit 15, and a second power supply circuit 19. The charging circuit 11 charges the energy storage device 27 with power based on a first-frequency signal received by the antenna circuit 24. The second power supply circuit 19 supplies power to the data conversion circuit 12 and the data writing circuit 15 using the energy stored in the energy storage device 27. The data conversion circuit 12 converts the second-frequency signal received by the antenna circuit 24 into a digital signal. The data writing circuit 15 operates based on the power supply from the second power supply circuit 19 and writes the digital signal formed by the data conversion circuit 12 directly or indirectly to the non-volatile memory 14. Therefore, when the electronic device 10 is not powered, the energy based on the signal received by the antenna circuit 24 can write information obtained from the signal received by the antenna circuit 24 to the non-volatile memory 14. With this configuration, even when the arithmetic circuit 13 is unable to operate, information transmitted wirelessly can be written to the non-volatile memory 14 without connecting signal lines and power lines to the electronic device 10.

[0113] <Effects of this embodiment> The effects of this embodiment will now be explained. (1) The electronic device 10 comprises a charging circuit 11, a data conversion circuit 12, an arithmetic circuit 13, a non-volatile memory 14, and a data writing circuit 15. The electronic device 10 further comprises a first power supply terminal 16, a second power supply terminal 17 to which a power storage device 27 is connected, a first power supply circuit 18 that supplies power to the arithmetic circuit 13, and a second power supply circuit 19. The second power supply circuit 19 supplies power to the data conversion circuit 12 and the data writing circuit 15 using the energy stored in the power storage device 27. The arithmetic circuit 13 stops operating when it is not receiving power from the first power supply circuit 18. The charging circuit 11 charges the power storage device 27 with power based on a first frequency signal received by the antenna circuit 24. The first conversion unit 40 of the data conversion circuit 12 converts a second frequency signal received by the antenna circuit 24 into a digital signal. The data writing circuit 15 operates based on the power supply from the second power supply circuit 19. The data writing circuit 15 then writes the digital signal formed by the data conversion circuit 12 to the non-volatile memory 14, either directly or indirectly.

[0114] With this configuration, data can be written to the non-volatile memory 14 of the electronic device 10 without connecting power and signal lines to the electronic device 10. This reduces the effort required when writing data to the electronic device 10.

[0115] (2) The frequency difference between the first frequency and the second frequency is set such that, in the case of simultaneous reception where the first frequency and the second frequency pass through the data conversion circuit 12 at the same time, the noise ratio of the signal of the second frequency is equal to or greater than a predetermined value.

[0116] With this configuration, the data conversion circuit 12 makes it easier to extract the second frequency signal when receiving signals of both the first and second frequencies simultaneously, thus making it easier to extract data from simultaneously received signals. Specifically, the data conversion circuit 12 can suppress conversion errors to digital signals when converting the second frequency signal to a digital signal.

[0117] (3) The antenna circuit 24 consists of only one antenna circuit 24. With this configuration, the electronic device 10 receives a signal of the first frequency and a signal of the second frequency from the antenna circuit 24 which consists of only one antenna circuit 24.

[0118] (4) The antenna circuit 24 may include a first antenna circuit 25 for receiving a first frequency signal and a second antenna circuit 26 for receiving a second frequency signal. With this configuration, the first antenna circuit 25 for receiving the first frequency signal and the second antenna circuit 26 for receiving the second frequency signal are configured separately. Therefore, the reception sensitivity for the first frequency signal and the second frequency signal can be improved, respectively. Consequently, the electronic device 10 that can be connected to such an antenna circuit 24 can suppress the occurrence of errors during operation.

[0119] (5) The energy storage device 27 has an electrical capacity greater than or equal to the amount of electrical power required for writing to the non-volatile memory 14. With this configuration, writing to the non-volatile memory 14 can be performed. Specifically, interruptions to the writing operation midway through are suppressed. As a result, information can be written to the non-volatile memory 14 smoothly.

[0120] (6) The data conversion circuit 12 further includes a second conversion unit 46. The second conversion unit 46 converts the digital signal containing the first information into an analog signal for transmission from the antenna circuit 24. With this configuration, the electronic device 10 can transmit the first information.

[0121] (7) The data writing circuit 15 operates the antenna circuit 24 to transmit a transmission signal indicating that data can be written, based on the fact that the charge amount of the energy storage device 27 is equal to or greater than a first threshold corresponding to the amount of electricity to be written. With this configuration, the timing when data can be written can be communicated to the communication partner. This prevents the communication partner from sending information before the electronic device 10 becomes ready for data writing. In this way, it is possible to prevent writing from starting when there is insufficient power. In this embodiment, the communication partner is the data transmission device 2.

[0122] (8) The data writing circuit 15 operates the antenna circuit 24 to transmit a transmission signal indicating a power supply request based on the fact that the charge level of the energy storage device 27 is below a second threshold, which is lower than the first threshold. This configuration makes it possible to prevent interruptions in writing due to insufficient power.

[0123] (9) The data conversion circuit 12 has a multiplexed signal separation circuit 12A. With this configuration, the multiplexed signals transmitted by the multiplexed modulation scheme can be separated. This increases the amount of signal that can be received.

[0124] (10) The electronic device 10 further includes a temporary storage memory 21. The non-volatile memory 14 is configured to allow data to be written to and erased in predetermined capacity increments. The data writing circuit 15 temporarily writes the digital signal formed by the data conversion circuit 12 to the temporary storage memory 21. When the size of the data written to the temporary storage memory 21 exceeds the predetermined capacity of the non-volatile memory 14, the data writing circuit 15 transfers the predetermined capacity of data from the temporary storage memory 21 to the non-volatile memory 14. This configuration makes it possible to suppress the number of times data is written to the non-volatile memory 14.

[0125] (11) The electrical device 1 comprises one of the electronic devices 10 with any of the configurations (1) to (10) described above. With this configuration, data can be written to the non-volatile memory 14 without connecting power wiring and signal lines to the electronic device 10.

[0126] An example of such electrical equipment 1 is an air conditioning unit. With an air conditioning unit equipped with an electronic device 10, when performing maintenance on the air conditioning unit during a period when the power supply to the building's air conditioning system is restricted, it is possible to access the electronic device 10 inside the air conditioning unit even when there is no power supply to the air conditioning system. Furthermore, it is possible to write information to the electronic device 10.

[0127] (12) When the electrical equipment 1 is not receiving power, the data transmission device 2 transmits a first frequency signal for supplying power and a second frequency signal for sending information to the electrical equipment 1. With this configuration, data can be written to the non-volatile memory 14 of the electronic device 10 located inside the electrical equipment 1 without connecting power wiring and signal lines to the electrical equipment 1.

[0128] (13) The data transmission device 2 does not transmit a second frequency signal for sending information to the electrical device 1 while power is being supplied to the electrical device 1. This prevents the non-volatile memory 14 from being overwritten during the access process when the arithmetic circuit 13 accesses the non-volatile memory 14 in the electronic device 10.

[0129] (modified version) In addition to the embodiments described above, the electronic device 10, electrical equipment 1, and data transmission device 2 of this disclosure may also be modified in the following ways, for example, and in combination of at least two mutually non-inconsistent modifications.

[0130] In this embodiment, the electronic device 10 comprises one semiconductor chip 10A, but it may be configured as a module consisting of multiple semiconductor chips. For example, the arithmetic circuit 13, which is one of the components of the electronic device 10, may be configured as a semiconductor chip different from the other components. Also, the non-volatile memory 14, which is one of the components of the electronic device 10, may be configured as a semiconductor chip different from the other components.

[0131] Although embodiments of the electronic device 10, electrical equipment 1, and data transmission device 2 have been described above, it will be understood that various modifications to the form and details are possible without departing from the spirit and scope of the electronic device 10, electrical equipment 1, and data transmission device 2 as described in the claims. [Explanation of symbols]

[0132] 1...Electrical equipment, 2...Data transmission device, 10...Electronic device, 11...Charging circuit, 12...Data conversion circuit, 13...Arithmetic circuit, 14...Non-volatile memory, 15...Data writing circuit, 16...First power supply terminal, 17...Second power supply terminal, 18...First power supply circuit, 19...Second power supply circuit, 21...Temporary storage memory, 24...Antenna circuit, 25...First antenna circuit, 26...Second antenna circuit, 27...Energy storage device, 40...First conversion unit, 46...Second conversion unit, 51...Antenna circuit.

Claims

1. In an electronic device (10) comprising a charging circuit (11), a data conversion circuit (12), an arithmetic circuit (13), a non-volatile memory (14), and a data writing circuit (15), A first power supply terminal (16) to which a power supply for supplying power to the electronic device (10) is connected, and a second power supply terminal (17) to which an energy storage device (27) is connected, A first power supply circuit (18) is connected to the first power supply terminal (16) and supplies power to the calculation circuit (13), The system includes a second power supply circuit (19) connected to the second power supply terminal (17) and which supplies power to the data conversion circuit (12) and the data writing circuit (15) using the energy stored in the energy storage device (27) connected to the second power supply terminal (17), The arithmetic circuit (13) accesses the non-volatile memory (14) when power is supplied from the first power supply circuit (18), and stops operating when power is not supplied from the first power supply circuit (18). The charging circuit (11) is connected to the antenna circuit (24) and the energy storage device (27), and charges the energy storage device (27) with power based on a first frequency signal received by the antenna circuit (24). The data conversion circuit (12) includes a first conversion unit (40) that converts a second frequency signal received by the antenna circuit (24) into a digital signal. The data writing circuit (15) operates based on the power supply from the second power supply circuit (19) and writes the digital signal formed by the data conversion circuit (12) directly or indirectly to the non-volatile memory (14). Electronic devices.

2. The frequency difference between the first frequency and the second frequency is set such that, in the case of simultaneous reception where the first frequency and the second frequency pass through the data conversion circuit (12) at the same time, the noise ratio of the signal of the second frequency is greater than or equal to a predetermined value. The electronic device according to claim 1.

3. The antenna circuit (24) consists of only one antenna circuit (24). The electronic device according to claim 1.

4. The antenna circuit (24) comprises a first antenna circuit (25) that receives a signal of the first frequency and a second antenna circuit (26) that receives a signal of the second frequency. The electronic device according to claim 1.

5. The energy storage device (27) has an electrical capacity greater than or equal to the amount of writing electricity required for the writing operation to the non-volatile memory (14). The electronic device according to claim 1.

6. The data conversion circuit (12) further includes a second conversion unit (46) that converts a digital signal containing the first information into an analog signal for transmission from the antenna circuit (24). The electronic device according to claim 5.

7. The data writing circuit (15) operates the antenna circuit (24) to transmit a transmission signal indicating that data can be written, based on the fact that the charge amount of the energy storage device (27) is equal to or greater than a first threshold corresponding to the amount of electricity to be written. The electronic device according to claim 6.

8. The data writing circuit (15) operates the antenna circuit (24) to transmit a transmission signal indicating a power supply request based on the fact that the charge level of the energy storage device (27) is below a second threshold, which is lower than a first threshold. The electronic device according to claim 6.

9. The data conversion circuit (12) has a multiplexed signal separation circuit (12A). The electronic device according to claim 1.

10. It is further equipped with temporary storage memory (21), The non-volatile memory (14) is configured to allow data to be written and erased in predetermined capacity increments. The data writing circuit (15) is The digital signal formed by the data conversion circuit (12) is temporarily written to the temporary storage memory (21), and when the size of the data written to the temporary storage memory (21) exceeds the predetermined capacity of the non-volatile memory (14), the predetermined capacity of data is transferred from the temporary storage memory (21) to the non-volatile memory (14). The electronic device according to claim 1.

11. An electrical device comprising an electronic device (10) according to any one of claims 1 to 10.

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