JP2000060010A - Electronic clock and charger for electronic clock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electronic clock and a charger for the electronic clock, which are capable of charge using optimum electromagnetic induction to the state of an electronic clock to be charged. SOLUTION: A charge control part 12 transmits a charge signal for a specified time to a coil control part 15, which applies an AC current to a coil 20, in response to the charge signal and forms an induction current in a coil 40 of an electronic clock 30. The induction current charges a secondary battery 31 through a signal detecting part 36 and a charge current supplying part 37. In the electronic clock 30 the end of charge supply from a charger 10 is detected, and then a voltage value of the secondary battery 31 is detected with a voltage detecting part 33. When the voltage value does not show full charge, a communication signal showing a demand for further charging is outputted from the coil 40 via a coil control part 35. When the charge control part 12 of the charger 10 detects the communication signal showing the demand for charging in a signal detecting part 16, the control part 12 retransmits the above charge signal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic timepiece and a charging device for an electronic timepiece that can be charged by electromagnetic induction.

[0002]

2. Description of the Related Art In an electronic timepiece using a secondary battery as a power source, the charging of the secondary battery is performed from within the electronic timepiece.
This has been done by removing the next battery and using a dedicated charger, or by providing a charging terminal on the electronic timepiece and connecting the terminal to the dedicated charger. However, the former involves complicated work such as removal of a secondary battery, and the latter involves problems such as inefficient charging and short-circuit due to deterioration of the terminal surface because the charging terminal is exposed to the outside. Was.

Therefore, an electronic timepiece having a secondary battery and a secondary coil therein, and a charging device having a charging coil for supplying an induction current to the secondary battery of the electronic timepiece via the secondary coil are disclosed. Has been proposed. For example, the electronic timepiece charging device disclosed in Japanese Patent Application Laid-Open No. 1-157232 has a charging coil and a timer, and operates the timer at the same time as the charging operation is started. When time elapses, the charging operation is automatically stopped. This solves the problem of reduction of energy waste and safety due to overcharging without deteriorating the advantages of electromagnetic induction charging that does not require electrical and mechanical joining means.

[0004]

However, in the electronic timepiece charger disclosed in Japanese Patent Laid-Open No. 1-157232, the time set by the timer, that is, the time for performing the charging operation is constant. For example, it is not always possible to optimally charge an electronic timepiece depending on the state of the secondary battery of the electronic timepiece, such as when the charged electronic timepiece is not sufficiently charged with the amount of charge provided by the timer set time or when it is overcharged. could not.

The present invention has been made in view of the disadvantages of the related art, and has as its object to provide an electronic timepiece and an electronic timepiece charging device that can perform optimal charging depending on the state of the electronic timepiece to be charged. The purpose is.

[0006]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, an electronic timepiece according to a first configuration of the present invention is an electronic timepiece including a secondary battery and a coil for performing charging using electromagnetic induction, wherein an induced current generated in the coil is provided. A charging current supply unit that supplies the secondary battery as a charging current, a signal detection unit that detects an induction current generated in the coil as a communication signal, and a voltage detection unit that detects a voltage value of the secondary battery. Acquiring a voltage value from the voltage detection unit when the communication signal detected by the signal detection unit indicates the end of the charging current; and when the acquired voltage value does not indicate the full charge state of the secondary battery. A charging control unit that outputs a communication signal that requests the supply of a charging current, and a coil control unit that supplies an alternating current to the coil to output a communication signal that requests the supply of the charging current as a change in magnetic flux. To Characterized in that it obtain.

According to the present invention, since the coil used for charging is also used for communication with the outside, the supply of the optimum charging current according to the state of charge of the internal secondary battery can be externally supplied. It can be carried out. An electronic timepiece according to a second configuration of the present invention is an electronic timepiece including a secondary battery and a coil for performing charging using electromagnetic induction, wherein an induction current generated in the coil is used as a charging current. A charging current supply unit that supplies the secondary battery, a signal detection unit that detects an induction current generated in the coil as a communication signal, a voltage detection unit that detects a voltage value of the secondary battery, and the signal detection unit. When the detected communication signal indicates the end of the charging current, a voltage value is obtained from the voltage detection unit, and when the obtained voltage value does not indicate the full charge state of the secondary battery, the voltage value is changed. A communication control unit that outputs a communication signal indicating that supply of charging current is stopped when the acquired voltage value indicates a fully charged state of the secondary battery; The change in magnetic flux Characterized in that it comprises a coil control section which supplies the alternating current to be output, a.

According to the present invention, the coil used for charging is also used for communication with the outside, and the voltage value of the internal secondary battery is detected and the voltage value is output as a communication signal. In addition, it is possible to externally supply an optimal charging current according to the voltage value of the secondary battery. An electronic timepiece according to a third configuration of the present invention is an electronic timepiece including a secondary battery and a coil for performing charging using electromagnetic induction, wherein an induction current generated in the coil is used as a charging current. A charging current supply unit that supplies the secondary battery, a transmission / reception unit that communicates with the outside by transmitting and receiving a communication signal, a voltage detection unit that detects a voltage value of the secondary battery, A charging control unit that obtains a voltage value, and outputs a signal indicating that supply of charging current is stopped to the transmission / reception unit when the obtained voltage value indicates a fully charged state of the secondary battery. And

According to the present invention, in addition to the coil used for charging, the transmission / reception unit for performing communication with the outside is provided, so that the communication signal indicating the state of charge of the internal secondary battery is transmitted. By transmitting by the transmission / reception unit, it is possible to externally supply an optimal charging current according to the state of charge of the secondary battery. An electronic timepiece charging apparatus according to a fourth configuration of the present invention is an electronic timepiece charging apparatus including a coil for charging an electronic timepiece that is charged by electromagnetic induction. A charging start signal input unit for inputting a charging start signal, a signal detection unit for detecting an induction current generated in the coil as a communication signal, and a case where the charging start signal is input or detected by the signal detection unit. A charge control unit that outputs a charge signal requesting supply of a charge current when the communication signal indicates a request for the charge current; and an AC current for supplying the charge current to the coil according to the charge signal. And a flowing coil control unit.

According to the present invention, since the coil used for charging is also used for communication with the outside, the supply of the optimum charging current to the outside according to the communication signal from the outside is performed. It can be carried out. Further, the electronic timepiece charging device according to the fifth configuration of the present invention, in the fourth configuration,
Each time the communication signal detected by the signal detection unit indicates the request for the charging current, the charging control unit outputs the charging signal with the charging current supply time reduced.

According to the present invention, the coil used for charging is also used for communication with the outside, and a charging current with a gradually reduced time interval is supplied every time a communication signal from the outside is received. As a result, more efficient and more optimal charging can be performed to the outside. An electronic timepiece charging device according to a sixth configuration of the present invention is an electronic timepiece charging device provided with a coil for charging an electronic timepiece charged by electromagnetic induction. A charging start signal input unit for inputting a charging start signal shown in the drawing, a signal detecting unit for detecting an induced current generated in the coil as a communication signal, and supplying a charging current for a predetermined time when the charging start signal is input. When the communication signal detected by the signal detection unit indicates a voltage value, the charging signal is requested, the charging time is calculated using the voltage value, and the supply of the charging current during the charging time is requested. A charging control unit for stopping the output of the charging signal when the communication signal detected by the signal detecting unit indicates that the supply of the charging current is stopped; Characterized in that it comprises a coil control section for supplying alternating current for the supply of the charging current in response to.

According to the present invention, the coil used for charging is also used for communication with the outside, and when the communication signal from the outside indicates a voltage value, an optimum charging time for the voltage value is used. Is calculated, it is possible to perform more efficient and optimal charging to the outside. An electronic timepiece charging device according to a seventh configuration of the present invention is an electronic timepiece charging device including a coil for charging an electronic timepiece that is charged by electromagnetic induction. A charging start signal input unit for inputting a charging start signal, a transmitting / receiving unit for communicating with the outside by transmitting / receiving a communication signal, and outputting a charging signal requesting supply of a charging current when the charging start signal is input. A charging control unit that stops outputting the charging signal when the communication signal received by the transmission / reception unit indicates the stop of the supply of the charging current; and a control unit that supplies the charging current to the coil according to the charging signal. And a coil control unit for supplying an alternating current for the purpose.

According to the present invention, in addition to the coil used for charging, the transmission / reception unit for performing communication with the outside is provided, so that the optimum charging is performed according to the communication signal received by the transmission / reception unit. The current can be supplied to the outside.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of an electronic timepiece and a charging device for an electronic timepiece according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited by the embodiment. (Embodiment 1) FIG. 1 is a block diagram showing a schematic configuration of an electronic timepiece and a charging device for an electronic timepiece according to the present invention. In FIG. 1, a charging device 10 includes a coil 20 for charging an electronic timepiece 30 described below and communicating with the electronic timepiece 30, a coil control unit 15 for supplying a pulse current to the coil 20 based on a charging signal, A signal detection unit 16 for detecting an induced current of the coil 20 induced as a communication signal from the clock 30, a display unit 13 for displaying the end of charging or a charging state with an LED or the like, and a charging start signal input unit 14 for starting a charging operation. A charge control unit 12 that transmits a charge signal to the coil control unit 15 in response to a signal from the charge start signal input unit 14 or the signal detection unit 16 and transmits a display signal to the display unit 13; And a power supply unit 11 that generates and supplies power for driving the power supply.

On the other hand, the electronic timepiece 30 includes an electronic timepiece function unit 34 that performs the function of a conventional electronic timepiece, and an electronic timepiece function unit 3.
4 and a secondary battery 31 serving as a drive power source for each unit described later
A voltage detector 33 for detecting the voltage of the secondary battery 31;
Coil 40 for generating induced current provided by coil 20 of charging device 10 and communicating with charging device 10
A coil control unit 35 that supplies a pulse current to the coil 40 based on a coil control command; a signal detection unit 36 that extracts a charging signal and a communication signal from an induced current generated in the coil 40; The coil control command is transmitted to the coil control unit 35 in accordance with a signal from the charging current supply unit 37 for rectifying the charging signal extracted in the step (a) and charging the secondary battery 31 and the voltage detection unit 33 or the signal detection unit 36. The charge control unit 32 has a basic configuration.

The electronic timepiece 30 can check the charge amount of the secondary battery 31 by the voltage detection unit 33 as one of the functions of the electronic timepiece function unit. When the user needs to charge the secondary battery 31 by checking the charge amount, the user sets the electronic timepiece 30 at a predetermined position of the charging device 10. FIG. 2 shows an electronic timepiece 3 for charging.
0 shows the positional relationship between the charging device 10 and the position where the magnetic flux generated at the center of the coils 40 and 20 passes through the center of each other, that is, electromagnetic induction between the coil 40 and the coil 20. Is a position where you can perform

Therefore, in the charging operation, the electronic timepiece 30 and the charging device 10 are arranged as shown in FIG.
It is started by depressing a charge start signal input unit 14 such as a switch provided at 0. The micro switch may be arranged at a position where the electronic timepiece 30 is turned on at the same time when the electronic timepiece 30 is installed in the charging device 10, and this may be used as the charging start signal input unit 14.

Next, the operation of the electronic timepiece charging apparatus according to the first embodiment will be described with reference to the flowchart shown in FIG. First, the user inputs a charge start signal via the charge start signal input unit 14 (switch ON) in a state where the electronic timepiece is arranged at the position as described above. When receiving the charge start signal from the charge start signal input unit 14, the charge control unit 12 of the electronic timepiece charging device transmits a display signal indicating a state of charging to the display unit 13 and displays a display corresponding to the display signal. (Lighting of an LED or the like). continue,
The charging control unit 12 sets the control state to a state in which the coil 20 is energized to induce a current in the coil 40 of the electronic timepiece (hereinafter, referred to as a charging device transmission mode) (step S101). That is, the coil control unit 15
Is activated, and the signal detection unit 16 is deactivated.

Then, the charge control unit 12 starts outputting a charge signal for causing the coil 20 to generate a magnetic flux to the coil control unit 15 (step S102). The charging signal is a pulse signal having a constant frequency as shown in FIG. 4A, and the coil control unit 15 converts the charging signal into an AC signal and supplies the AC signal to the coil 20. The magnetic flux generated in the coil 20 by the alternating current is applied to the coil 4 of the electronic timepiece 30.
0, and induces an induced current in the coil 40 as a charging current. Further, in step S102, a timer (not shown) operates at the same time as the start of the output of the charging signal. While continuing to output the charging signal, the coil control unit 15 checks this timer to determine whether a set predetermined time (charging time) has elapsed (step S1).
03). In FIG. 4A, Tc corresponds to this charging time.

If it is determined in step S103 that the predetermined charging time Tc has not elapsed, the above-described checking of the timer is repeated. In step S103, when the predetermined charging time Tc has elapsed, the output of the charging signal is stopped (step S104). Then, the charging control unit 12 sets the control state to a state where the current induced in the coil 20 can be detected as a communication signal (hereinafter, referred to as a charging device reception mode) (step S105). That is, the coil control unit 15 is deactivated, and the signal detection unit 16 is activated. The signal detection unit 16 includes the coil 2
It is determined whether an end signal has been received by detecting the current induced to 0 (step S106). Here, as shown in FIG. 4A, after the output of the charging signal for the charging time TC, the reception of the end signal is performed in the charging device reception mode for a certain standby time Tw.

Therefore, when the end signal is not received in step S106, it is determined whether the standby time Tw has elapsed (step S107). If the standby time Tw has not elapsed in step S107, the process returns to step S106 again, and it is determined whether an end signal has been received. If the standby time Tw has elapsed in step S107, that is, if the electronic
In the charging performed in response to the charging signal output in step 2, a sufficient charging state is not achieved, and when further charging is requested, the process returns to step S101 again to change the control state to the charging device transmission mode. Set and start outputting the charging signal.

In step S106, when the end signal is received, it indicates that the rechargeable battery 31 of the electronic timepiece 30 is fully charged (full charge), and the display section 13 turns off the display indicating that charging is in progress. End the operation. In the above-described operation of the charging device, particularly, in the charging device reception mode, as shown in FIG. 5A, when no signal is received during the standby time Tw, the charging operation is continued.
As shown in FIG. 4A, when a signal is received from the electronic timepiece during the standby time Tw, the signal is interpreted as an end signal to terminate the charging operation. The continuation / end of the charging operation may be determined based on the pattern of the received communication signal.

Next, the operation of the electronic timepiece according to the first embodiment will be described with reference to the flowchart shown in FIG. The charge control unit 32 for the electronic timepiece is set in advance to a control state in which a current induced in the coil 40 can be detected as a charge signal (hereinafter, referred to as an electronic timepiece reception mode) (step S201). . That is, in the initial state, the signal detection unit 36 is activated and the coil control unit 35 is deactivated.

First, the signal detector 36 detects a current induced in the coil 40 as a charging signal. The charging signal is supplied to the charging current supply unit 37 as a charging current, is rectified in the charging current supply unit 37, and charges the secondary battery 31. In addition, the signal detection unit 36 determines whether or not the charging signal has ended after the detection of the charging signal (Step S203). The end of the charging signal can be easily determined because the charging signal is output at a known constant frequency. If the end of the charging signal is not detected in step S203, the determination in step S203 is repeated.

In step S203, when the end of the charging signal is detected, the signal detecting section 36 transmits a signal indicating the end of the charging signal to the charging control section 32. When receiving the signal indicating the end of the charging signal, the charging control unit 32 obtains the detection result of the voltage of the secondary battery 31 from the voltage detecting unit 33 (step S204), and the voltage value indicates that the secondary battery 31 is full. It is determined whether or not the charging state is indicated (step S
205).

In step S205, if the detected voltage value does not indicate a full charge state, it means that further charge is required, and the process returns to step S202 again to input a charge signal. Here, as shown in FIGS. 5A and 5B, in the charging device, the charging time T
If the signal from the electronic timepiece is not received during the standby time Tw after the output of the charging signal of c is completed, that is, if the electronic timepiece does not transmit a signal, the output of the charging signal is started again. Also in the electronic timepiece, step S2
02, the charging signal can be input again.

In step S205, when the detected voltage value indicates a full charge state, the charge control unit 32
The control state is set to a state in which the coil 40 is energized to induce a current in the coil 20 of the charging device (hereinafter, referred to as an electronic timepiece transmission mode) (step S20).
6). That is, the coil control unit 35 is activated,
The signal detector 36 is deactivated. Then, the charging control unit 32 outputs an end signal indicating completion of charging via the coil control unit 35 (step S207), and ends the charging operation. Here, the end signal is, for example, a pulse signal as shown in FIG. 4B, and the coil control unit 35 converts the end signal into an AC signal, so that an AC current flows through the coil 40. The magnetic flux generated in the coil 40 by the alternating current is applied to the coil 20 of the charging device 10 to cause the coil 20 to generate an induced current. In the charging device, as described above, this induced current is detected as an end signal.

In the operation of the electronic timepiece described above,
In the electronic timepiece transmission mode, as shown in FIG. 5B, when the secondary battery does not show the fully charged state, that is, when it is necessary to continue the charging operation, no signal is transmitted, and as shown in FIG. As shown in b), when the secondary battery indicates a fully charged state, that is, when the charging operation is terminated, a signal is transmitted as an end signal. A signal may be transmitted.

In the first embodiment described above, the charging signal output from the charging control unit 12 of the electronic timepiece charging device 10 is represented by the signal output time, that is, the charging time Tc.
However, as shown in FIG. 7, each time the output of the charging signal is requested, Tc1, Tc2, Tc3,
Tc4,. . . You may gradually reduce the time. This is because every time the number of times of charging by the charging signal is repeated, the required amount of charge required to reach the state of full charge is reduced, so that particularly efficient charge is performed in the state immediately before full charge. Energy consumption due to overcharging can be prevented.

According to the electronic timepiece and the charging device for an electronic timepiece according to the first embodiment described above, non-contact charging that does not require electrical and mechanical joining means is achieved by using an induction coil. At the same time, the induction coil is used not only as a means for supplying a charging current but also as a communication means, so that the charging device side can know the charging state of the secondary battery of the electronic timepiece. Optimum charging can be performed according to the state of charge. (Embodiment 2) Next, an electronic timepiece and a charging device for an electronic timepiece according to Embodiment 2 will be described. The schematic configurations of the electronic timepiece and the electronic timepiece charging device according to the second embodiment are the same as those in FIG. 1 described in the first embodiment, and thus description thereof will be omitted. The difference between the electronic timepiece and the electronic timepiece charging device according to the second embodiment from the first embodiment is the signal processing in charge control units 12 and 32.

The operation of the electronic timepiece charging apparatus according to the second embodiment will be described with reference to the flowchart shown in FIG. First, the user inputs a charge start signal via the charge start signal input unit 14 (switch ON) in a state where the electronic timepiece is arranged at the position described in the first embodiment. When the charge control unit 12 of the electronic timepiece charging device receives the charge start signal from the charge start signal input unit 14,
By transmitting a display signal indicating the charging state to the display unit 13,
A display (lighting of an LED or the like) corresponding to the display signal is performed. Next, the charging control unit 12 sets the control state to a state in which the coil 20 is energized to induce a current in the coil 40 of the electronic timepiece (hereinafter, referred to as a charging device transmission mode) (step S301). . That is, the coil control unit 15 is activated and the signal detection unit 16 is deactivated.

Next, an initial value t0 is set for a charging time T described later.
Is initialized (step S30).
2). Subsequently, the charge control unit 12 starts outputting a charge signal for causing the coil 20 to generate a magnetic flux to the coil control unit 15 (Step S303). The charging signal is
This is a pulse signal having a constant frequency as described in the first embodiment, and the coil control unit 15 converts the charging signal into an AC signal, thereby causing an AC current to flow through the coil 20. The magnetic flux generated in the coil 20 by this AC current is applied to the coil 40 of the electronic timepiece 30 and the coil 40
To generate an induction current that becomes a charging current. Also, in step S303, the output of the charging signal is started,
A timer (not shown) operates. The coil control unit 15 includes:
By checking this timer while the charging signal is being output, it is determined whether a set predetermined time (charging time) T has elapsed (step S304).

In step S304, if the charging time T has not elapsed, the above-described checking of the timer is repeated. In step S304, when the charging time T has elapsed, the output of the charging signal is stopped (step S30).
5). Then, the charging control unit 12 sets the control state to a state where the current induced in the coil 20 can be detected as a communication signal (hereinafter, referred to as a charging device reception mode) (step S306). That is, the coil control unit 15 is deactivated, and the signal detection unit 16 is activated. The signal detection unit 16 determines whether a communication signal has been received by detecting a current induced in the coil 20 (step S307). The communication signal indicates whether it is a voltage value signal or an end signal, which will be described later, depending on the pulse pattern. As described in the first embodiment,
After the output of the charging signal for the charging time T, the reception of the communication signal is performed in the charging device reception mode for a certain standby time Tw.

If no communication signal is received in step S307, the determination of reception of the communication signal in step S307 is repeated. If a communication signal has been received in step S307, it is determined whether the communication signal indicates an end signal (step S308). Step S30
In step 8, if the communication signal does not indicate the end signal, the communication signal is interpreted as a signal indicating the voltage value V of the secondary battery 31 of the electronic timepiece 30, and the charging time t is calculated from the communication signal (step S8). S309).

Here, the charging time t is known as the capacity of the secondary battery 31: C, the charging current caused by the induction current of the coil 40: I, the voltage value in the fully charged state of the secondary battery 31: VF, respectively. Can be calculated using an expression such as t = C (VF−V) / I.

Subsequently, the charging time t calculated in step S309 is substituted for the charging time T used in step S304 (step S310). Then, the control state is set to the charging device transmission mode (step S311), and the process returns to step S303 again to start outputting the charging signal. In step S308, when the communication signal indicates the end signal, it indicates that the charging of the secondary battery of the electronic timepiece 30 is completed (full charge), the display indicating that the charging is being performed on the display unit 13 is turned off, and the charging operation is performed. To end.

In the above operation of the electronic timepiece charging apparatus, in particular, once the charging time t in step S309 has been calculated once, the number of repetitions of the charging signal output start process in step S303 is forcibly set to one. The charging operation may be terminated after the output of the charging signal is stopped. Next, the operation of the electronic timepiece according to the second embodiment will be described with reference to the flowchart shown in FIG. The charging control unit 32 of the electronic timepiece 30 sets the control state in advance to a state where the current induced in the coil 40 can be detected as a charging signal (hereinafter, referred to as an electronic timepiece reception mode) (step S401). ). That is, in the initial state, the signal detection unit 36 is activated and the coil control unit 35 is deactivated.

First, the signal detecting section 36 detects and inputs a current induced in the coil 40 as a charging signal (step S402). The charging signal is supplied to the charging current supply unit 37 as a charging current, is rectified in the charging current supply unit 37, and charges the secondary battery 31. Also,
The signal detection unit 36 determines whether or not the charging signal has ended after the detection of the charging signal (Step S403). The end of the charging signal can be easily determined because the charging signal is output at a known constant frequency. If the end of the charging signal is not detected in step S403, the determination in step S403 is repeated.

When the end of the charging signal is detected in step S403, the signal detecting section 36 transmits a signal indicating the end of the charging signal to the charging control section 32. When receiving the signal indicating the end of the charging signal, the charging control unit 32 changes the control state to a state in which the coil 40 is energized and a current can be induced in the coil 20 of the charging device (hereinafter, referred to as a charging state).
(Referred to as electronic clock transmission mode) (step S
404). That is, the coil control unit 35 is activated and the signal detection unit 36 is deactivated.

Subsequently, the charge control unit 32 controls the voltage detection unit 3
The detection result of the voltage of the secondary battery 31 is obtained from Step 3 (Step S405), and it is determined whether or not the voltage value V indicates the fully charged state of the secondary battery 31 (Step S406). If the detected voltage value V does not indicate a full charge state in step S406, a communication signal indicating the voltage value V is output as a pulse pattern via the coil control unit 35 (step S408). After the process in step S408, the process returns to step S401 again to set the electronic timepiece reception mode, so that a charging signal from the charging device 10 can be input. Here, unlike Embodiment 1,
In the charging device, immediately after receiving the communication signal from the electronic timepiece after the output of the charging signal for the charging time T is completed, the charging device starts outputting the charging signal according to the communication signal. Is again possible.

In step S406, when the detected voltage value V indicates a full charge state, the charge control unit 32
Outputs an end signal indicating the completion of charging as a pulse pattern via the coil control unit 35 (step S40).
7) The charging operation ends. The communication signal in step S408 and the end signal in step S407 are both converted into an AC signal for flowing through the coil 40 by the coil control unit 35.
Is applied to the coil 20 of the charging device 10 to generate an induced current in the coil 20. In the charging device, as described above, the induced current is detected as a communication signal.

According to the electronic timepiece and the charging device for an electronic timepiece according to the second embodiment described above, non-contact charging that does not require electrical and mechanical joining means is achieved by using an induction coil. At the same time, the induction coil is used not only as a means for supplying a charging current but also as a communication means, and the electronic watch outputs the voltage value of the secondary battery as a communication signal.
On the charging device side, the electronic watch can be optimally charged according to the voltage value.

In Embodiments 1 and 2 described above, the end of the charging signal input to the electronic timepiece is detected as a state in which the charging signal is no longer input, but as shown in FIG. During the charging device transmission mode, a pulse pattern indicating a stop signal is output from the charging device after the charging signal TC for the charging time TC, and the stop signal is detected by the electronic timepiece. Thus, the end of the charging signal can be determined.

In the charging device, a coil for outputting a charging signal (charging current) and a coil for inputting a communication signal are commonly used as one coil. However, a relatively weak intensity output from the electronic timepiece is used. A communication signal input coil capable of optimally receiving a communication signal may be provided. (Embodiment 3) Next, an electronic timepiece and a charging device for an electronic timepiece according to Embodiment 3 will be described. FIG.
FIG. 9 is a block diagram of an electronic timepiece and a charging device according to Embodiment 3. 11, a charging device 50 includes a coil 20 for charging an electronic timepiece 60 described later, a coil control unit 15 for supplying a pulse current to the coil 20 based on a charging signal, and transmission and reception of a communication signal to and from the electronic timepiece 60. Transmitting / receiving section 17 for performing charging, display section 13 for displaying the end of charging or the charging state with an LED or the like, charging start signal inputting section 14 for starting charging operation, A charging control unit 12 for transmitting a charging signal to the coil control unit 15 and transmitting a display signal to the display unit 13; and a power supply unit 11 for generating and supplying a power supply for driving the above units from an AC power supply. Configuration.

On the other hand, the electronic timepiece 60 includes an electronic timepiece function part 34 that performs the function of a conventional electronic timepiece, and an electronic timepiece function part 3.
4 and a secondary battery 31 serving as a drive power source for each unit described later
A voltage detector 33 for detecting the voltage of the secondary battery 31;
A coil 40 for generating an induction current provided by the coil 20 of the charging device 50, a transmitting / receiving unit 38 for transmitting and receiving a communication signal to and from the charging device 10, and rectifying the induction current generated in the coil 40 to change the secondary battery 31 The charging current supply unit 37 to be charged and the charging current supply unit 37 are driven according to a signal from the transmission / reception unit 38, and a communication signal to the charging device 50 is transmitted to the transmission / reception unit 38 according to a signal from the voltage detection unit 33. And a charge control unit 32 to be used.

The electronic timepiece and the electronic timepiece charging device according to the third embodiment are different from the first and second embodiments in that a communication signal transmitted and received between the charging device and the electronic timepiece can be transmitted without using a coil. This is performed by the transmission / reception units provided respectively. That is, the coils 20 and 40 are used only for generating an induced current on the electronic timepiece side, similarly to a conventional electronic timepiece and a charging device for electronic timepieces utilizing electromagnetic induction. Therefore, the transmission / reception units 17 and 38
Transmits and receives the communication signal (including both the end signal and the voltage signal) described in the first and second embodiments.

Next, the operation of the electronic timepiece and the electronic timepiece charging device according to the third embodiment will be described below. First, the charging control unit 12 of the charging device 50 transmits a start signal indicating the start of the charging operation to the electronic timepiece 60 via the transmission / reception unit 17. The charging control unit 32 of the electronic timepiece 60 receives the start signal via the transmission / reception unit 38, and
Activate 7 Charge control unit 12 of charging device 50
Transmits a charge signal to the coil control unit 15 following transmission of the start signal. The coil control unit 15 causes an alternating current to flow through the coil 20 based on the charging signal to generate a magnetic flux, thereby generating an induced current in the coil 40 of the electronic timepiece 60. The charging current supply unit 37 of the electronic timepiece 60 includes a coil 40
The secondary battery 31 is charged by rectifying the induced current generated in the above.

The charge control unit 32 of the electronic timepiece 60 deactivates the charge current supply unit 37 at a certain time interval, and acquires the voltage value of the secondary battery 31 from the voltage detection unit 33. If the acquired voltage value indicates the fully charged state of the secondary battery 31, the charging device 50
Sends an end signal to the side. Charge control unit 1 of charging device 50
2 receives the end signal, stops transmitting the charging signal to the coil control unit 15, and ends the charging operation.

On the other hand, in the electronic timepiece 60, when the obtained voltage value does not indicate the fully charged state of the secondary battery 31,
The charging control unit 32 activates the charging current supply unit 37 again, and continues charging the secondary battery. According to the electronic timepiece and the electronic timepiece charging device according to Embodiment 3 described above, in addition to the coil for supplying the charging current,
Since the transmission / reception unit for checking the charging state of the electronic timepiece is provided, for example, a connection terminal for connecting the transmission / reception unit of the electronic timepiece and the charging device for the electronic timepiece to each other is provided to be exposed to the electronic timepiece. Even if the connection terminal is 2
Since it is not directly connected to the secondary battery, it is possible to avoid problems such as leakage due to short-circuit and reduction in charging efficiency due to deterioration of the terminal surface. Further, the communication signal enables optimal and efficient charging.

[0050]

According to the present invention, since the coil used for charging is also used for communication with the outside, it is possible to supply an optimum charging current according to the state of charge of the internal secondary battery. Can be done externally. According to the present invention, the coil used for charging is also used for communication with the outside, and the voltage value of the internal secondary battery is detected and the voltage value is output as a communication signal. It is possible to externally supply an optimal charging current according to the battery voltage value.

According to the present invention, in addition to the coil used for charging, the transmission / reception unit for performing communication with the outside is provided, so that the communication signal indicating the charging state of the internal secondary battery is provided. Is transmitted by the transmitting / receiving section,
It is possible to externally supply an optimal charging current according to the state of charge of the secondary battery. Further, according to the present invention, the coil used for charging is also used for communication with the outside, so that an optimal charging current is supplied to the outside in accordance with a communication signal from the outside. be able to.

Further, according to the present invention, the coil used for charging is also used for communication with the outside, and each time a communication signal from the outside is received, the charging current at the time interval gradually reduced. , It is possible to perform more efficient and more optimal charging to the outside. Further, according to the present invention, when the coil used for charging is also used for communication with the outside, and the communication signal from the outside indicates a voltage value,
Since the optimal charging time is calculated with respect to the voltage value, it is possible to perform more efficient and optimal charging to the outside.

Further, according to the present invention, in addition to the coil used for charging, a transmitting / receiving section for performing communication with the outside is provided, so that the optimum transmitting / receiving section responds to the communication signal received by the transmitting / receiving section. It is possible to supply a sufficient charging current to the outside.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of an electronic timepiece and a charging device for an electronic timepiece according to the present invention.

FIG. 2 is a diagram illustrating an arrangement of the electronic timepiece and the electronic timepiece charging device according to the first embodiment.

FIG. 3 is a flowchart showing an operation of the electronic timepiece charging device according to the first embodiment.

FIG. 4 is a diagram illustrating the operation of the electronic timepiece and the electronic timepiece charging device according to the first embodiment.

FIG. 5 is a diagram illustrating the operation of the electronic timepiece and the electronic timepiece charging device according to the first embodiment.

FIG. 6 is a flowchart showing an operation of the electronic timepiece according to the first embodiment.

FIG. 7 is a diagram illustrating the operation of the electronic timepiece and the electronic timepiece charging device according to the first embodiment.

FIG. 8 is a flowchart showing an operation of the electronic timepiece charging device according to the second embodiment.

FIG. 9 is a flowchart showing an operation of the electronic timepiece according to the first embodiment.

FIG. 10 is a diagram illustrating the operation of the electronic timepiece and the charging device for the electronic timepiece according to the present invention.

FIG. 11 is a block diagram showing a schematic configuration of an electronic timepiece and a charging device for an electronic timepiece according to a third embodiment.

[Explanation of symbols]

 10, 50 Charging device 11 Power supply unit 12, 32 Charging control unit 13 Display unit 14 Charging start signal input unit 15, 35 Coil control unit 16, 36 Signal detection unit 17, 38 Transmission / reception unit 20, 40 Coil 30, 60 Electronic timepiece 31 secondary battery 33 voltage detection unit 34 electronic clock function unit 37 charging current supply unit

Claims (7)

[Claims] 1. An electronic timepiece including a secondary battery and a coil for performing charging using electromagnetic induction, wherein a charging current supply unit that supplies an induction current generated in the coil to the secondary battery as a charging current. A signal detection unit that detects an induced current generated in the coil as a communication signal; a voltage detection unit that detects a voltage value of the secondary battery; and a communication signal detected by the signal detection unit is a signal of the charging current. A charge control for obtaining a voltage value from the voltage detection unit when indicating the end, and outputting a communication signal requesting supply of a charging current when the obtained voltage value does not indicate the full charge state of the secondary battery. An electronic timepiece comprising: a unit; and a coil control unit that supplies an alternating current for outputting a communication signal requesting the supply of the charging current to the coil as a change in magnetic flux. 2. An electronic timepiece including a secondary battery and a coil for performing charging using electromagnetic induction, wherein a charging current supply unit that supplies an induction current generated in the coil to the secondary battery as a charging current. A signal detection unit that detects an induced current generated in the coil as a communication signal; a voltage detection unit that detects a voltage value of the secondary battery; and a communication signal detected by the signal detection unit is a signal of the charging current. A voltage signal is obtained from the voltage detection unit when indicating the end, and when the obtained voltage value does not indicate the full charge state of the secondary battery, a communication signal indicating the voltage value is output, and the obtained voltage is output. When the value indicates a full charge state of the secondary battery, a charge control unit that outputs a communication signal indicating that supply of charging current is stopped; and an AC power supply that outputs the communication signal to the coil as a change in magnetic flux. Electronic timepiece characterized by comprising a coil controller flowing. 3. An electronic timepiece including a secondary battery and a coil for performing charging using electromagnetic induction, wherein a charging current supply unit that supplies an induction current generated in the coil to the secondary battery as a charging current. A transmitting and receiving unit for performing communication with the outside by transmitting and receiving a communication signal; a voltage detecting unit for detecting a voltage value of the secondary battery; and acquiring a voltage value from the voltage detecting unit in a predetermined cycle;
An electronic timepiece, comprising: a charging control unit that outputs, to the transmitting / receiving unit, a signal indicating stop of charging current supply when the acquired voltage value indicates a fully charged state of the secondary battery. 4. A charging device for an electronic timepiece provided with a coil for charging an electronic timepiece charged by electromagnetic induction, comprising: a charging start signal input unit for inputting a charging start signal indicating the start of a charging operation; A signal detecting unit that detects an induced current generated in the coil as a communication signal; and charging when the charging start signal is input or when a communication signal detected by the signal detecting unit indicates a request for the charging current. A charging control unit that outputs a charging signal requesting current supply; and a coil control unit that supplies an alternating current for supplying the charging current to the coil according to the charging signal. Charging device for electronic watches. 5. The charging control section outputs the charging signal having a reduced charging current supply time every time a communication signal detected by the signal detecting section indicates a request for the charging current. The charging device for an electronic timepiece according to claim 4, wherein 6. A charging device for an electronic timepiece provided with a coil for charging an electronic timepiece charged by electromagnetic induction, comprising: a charging start signal input unit for inputting a charging start signal indicating the start of a charging operation; A signal detection unit that detects an induced current generated in the coil as a communication signal, and outputs a charging signal requesting a supply of a charging current for a predetermined time when the charging start signal is input. When the detected communication signal indicates a voltage value, the charging time is calculated using the voltage value, a charging signal requesting supply of a charging current for the charging time is output, and the detection is performed by the signal detection unit. A charging control unit that stops outputting the charging signal when the communication signal indicates that the supply of the charging current is stopped; and a control unit that supplies the charging current to the coil according to the charging signal. Electronic timepiece charging device, characterized in that it comprises a coil control section for flowing a fluid current, a. 7. A charging device for an electronic timepiece having a coil for charging an electronic timepiece charged by electromagnetic induction, comprising: a charging start signal input unit for inputting a charging start signal indicating the start of a charging operation; A transmission / reception unit that communicates with the outside by transmitting / receiving a communication signal, and outputs a charging signal requesting supply of a charging current when the charging start signal is input, and the communication signal received by the transmission / reception unit is a charging current. A charging control unit that stops outputting the charging signal when the supply of the charging signal is stopped; and a coil control unit that supplies an alternating current for supplying the charging current to the coil according to the charging signal. A battery charger for an electronic timepiece.