JP2004004137A - Electronic device and control method for electronic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a decrease in the amount of electric energy in a power saving mode and quickly start an operation at a restart.
When the electronic timepiece is in a power saving mode in which current time display is stopped, it is determined whether or not a charging voltage supplied from a large-capacity capacitor is higher than a predetermined reference voltage. Since electric energy required for returning from the power saving mode to the display mode is stored in the capacitor, the current time return process is performed when power generation is detected. On the other hand, when the charging voltage is equal to or lower than the predetermined reference voltage, the supply of the power supply voltage to the control circuit is stopped to suppress wasteful consumption of the electric energy stored in the large-capacity capacitor.
[Selection diagram] Fig. 4

Description

The present invention relates to an electronic device and a control method of the electronic device, and more particularly to an electronic device and a control method of the electronic device in which an operation mode of the electronic device is switched between a driving mode and a power saving mode.

2. Description of the Related Art In recent years, there is an electronic wristwatch as an example of an electronic device. This wristwatch has a built-in power supply unit, and the power supply unit includes a power generating device having a rotating weight and a power storage unit ( ). In this type of electronic timepiece, the time is displayed by a time display unit using electric energy discharged from a capacitor, and the operation of the timepiece is performed for a long time without replacing a battery. .

An electronic timepiece with a built-in power supply means having a power generation device supplies stable electric energy over a long period of time, so that when the power generation device is in a non-power generation state for a predetermined time or in a non-portable state, By detecting these states, the operation mode of the electronic timepiece is switched from a driving mode (display mode) for displaying time to a power saving mode for not displaying time.
Here, in the power saving mode of the electronic timepiece, electric energy is supplied only to the control circuit for counting the current time without displaying the time. On the other hand, in a display mode (drive mode) in which a normal time display is performed, electric energy is supplied to the control circuit and, for example, in the case of an analog timepiece, electric energy is also supplied to the drive circuit that drives the hands.
When the user puts the electronic watch in the power saving mode on the wrist and starts power generation again, the mode is switched from the power saving mode to the display mode, and the time display unit displays the current time based on the data stored in the counter. To return to. For example, in the case of an analog clock using hands, the hands are fast-forwarded to quickly return to the current time.

However, when the electronic timepiece continues the power saving mode (non-power generation time) for a long time, the electric energy stored in the large-capacity capacitor is gradually consumed, and almost no electric energy remains in the large-capacity capacitor. In this case, not only is it impossible to return to the current time, but also it takes time for the time display unit itself to store the electric energy necessary for restarting, and the startability of the electronic timepiece 1 deteriorates. There was a fear.

The present invention has been made in view of the above-described circumstances, and in a power saving mode, when the electric energy required for the current time return does not remain in the power supply means, the power consumption is reduced by reducing the consumption of the electric energy. It is an object of the present invention to provide an electronic device and a control method for the electronic device, which can hold the electrical energy of the electronic device and quickly restart the driven unit.

According to a first aspect of the present invention, a chargeable power supply unit that supplies electric energy, a drive control unit that operates by the electric energy supplied from the power supply unit and outputs a drive signal, and receives the drive signal A driven part to be driven, a mode switching part for switching an operation mode of the driven part between a driving mode for performing normal driving and a power saving mode based on a first condition set in advance, and the mode switching part When it is determined in the power saving mode that the amount of electric energy stored in the power supply unit has become smaller than the predetermined amount of electric energy based on the second condition set in advance, the operation of the drive control unit And an operation stopping unit for stopping the operation.

According to a second aspect of the present invention, in the first aspect of the present invention, the operation stop unit stops the electric energy supplied from the power supply unit to the drive control unit when stopping the operation of the drive control unit. It is characterized by:

According to a third aspect of the present invention, in the first aspect of the present invention, the drive control unit is operable with electric energy supplied from the power supply unit to output a control signal; A mode switching section that supplies electric energy to the control circuit and the drive circuit in the drive mode, and that saves power by receiving a control signal and outputting a drive signal to the driven section. In the mode, electric energy is supplied only to the control circuit.

According to a fourth aspect of the present invention, in the first aspect of the present invention, the power supply unit includes a power generation unit that converts external energy into electric energy, stores the electric energy supplied from the power generation unit, and converts the electric energy. A power storage unit for supplying the drive control unit.

５A fifth aspect of the present invention is the fourth aspect of the present invention, characterized in that in the fourth aspect of the present invention, the power storage unit is constituted by a secondary power supply or a capacitor.

According to a sixth aspect of the present invention, in the fourth aspect of the present invention, a power generation state detection unit for detecting whether or not the power generation unit is in a power generation state is provided, and the first condition is determined by the power generation state detection unit. It is characterized by whether or not the power generation unit is in a power generation state.

According to a seventh aspect of the present invention, in the sixth aspect of the present invention, the power generation state detection unit is configured to determine whether the amount of electric energy output from the power generation unit exceeds the determination energy amount. And a power generation time determination unit that determines whether the duration of the electric energy amount exceeding the determination energy amount exceeds the determination time value by the energy amount determination unit.

According to an eighth aspect of the present invention, in the first aspect of the present invention, a portable state detection unit for detecting whether or not the electronic device is in a portable state is provided, and the first condition is an operation of the driven unit. When switching the mode from the driving mode to the power saving mode, the portable state detection unit detects that the electronic device is in the non-portable state, and the electronic device is in the non-portable state for a predetermined time. The operation mode of the driven unit is switched from the power saving mode to the drive mode when the electronic device is switched from the non-portable state to the portable state by the portable state detection unit.

According to a ninth aspect of the present invention, in the first aspect of the present invention, a voltage detection unit for detecting a voltage of the power supply unit is provided, and a second condition is that a voltage of the power supply unit detected by the voltage detection unit is a predetermined voltage. It is characterized in that the voltage falls below the voltage.

According to a tenth aspect of the present invention, in the first aspect of the present invention, an electric energy amount detecting section for detecting an amount of electric energy supplied from the power supply section is provided, and a second condition is that the electric energy amount detecting section is provided. The amount of electric energy that can be supplied by the power supply unit detected by the unit is smaller than the predetermined amount of electric energy required to return the operation mode of the driven unit from the power saving mode to the driving mode. Features.

According to an eleventh aspect of the present invention, in the fourth aspect of the present invention, a power generation state detection unit for detecting whether the power generation unit is in a power generation state is provided, and the operation of the drive control unit is stopped by the operation stop unit. An operation start unit that starts the operation of the drive control unit when a third condition set in advance is satisfied in the state, and the third condition is that the power generation unit generates power by the power generation state detection unit. It is characterized in that it is started.

According to a twelfth aspect of the present invention, in the eleventh aspect of the present invention, when the start of power generation under the third condition is such that the amount of electric energy output from the power generation unit exceeds the restartable energy amount, Is continued for a predetermined time.

According to a thirteenth aspect of the present invention, in the first aspect of the present invention, a portable state detection unit for detecting whether or not the electronic device is in a portable state is provided. An operation start unit that starts the operation of the drive control unit based on a third condition set in advance when the electronic device is in a stop state is provided by the portable state detection unit as a third condition. Is characterized in that it is determined whether the state has been switched from the non-carrying state to the carrying state.

According to a fourteenth aspect of the present invention, in the thirteenth aspect of the present invention, the switching from the non-portable state to the portable state is such that the time in the portable state after switching from the non-portable state to the portable state has continued for a predetermined time. It is characterized by what is done when.

According to a fifteenth aspect of the present invention, in the first aspect of the present invention, an external operation input unit operated by a user from outside is provided, and a driving mode by a mode switching unit is set based on an operation state of the external operation input unit. It is characterized by switching to a power saving mode.

According to a sixteenth aspect of the present invention, in the first aspect of the present invention, an external operation input unit operated by a user from outside is provided, and when the operation of the drive control unit is stopped by the operation stop unit, An operation start unit for starting operation of the drive control unit based on an operation state of the external operation input unit is provided.

According to a tenth aspect of the present invention, in any one of the first to sixteenth aspects of the present invention, the driven unit has a time display unit for displaying a time.

According to an eighteenth aspect of the present invention, in the seventeenth aspect of the present invention, when the operation control unit switches the operation mode of the driven unit from the power saving mode to the driving mode by the mode switching unit, the time display is changed to the current time. It is characterized by including a current time return unit that performs a return operation for returning.

According to a nineteenth aspect of the present invention, in the eighteenth aspect of the present invention, the predetermined amount of electric energy is set to an amount of electric energy necessary for returning to the current time from the power saving mode using the current time return unit. It is characterized by:

According to a twentieth aspect of the present invention, in the eighteenth aspect of the present invention, the amount of energy that can be returned is set to a minimum value at which time display can be performed using the time display unit by starting operation of the drive control unit. It is characterized in that it is set to the minimum amount.

According to a twenty-first aspect of the present invention, in the eighteenth aspect of the present invention, the time display unit has a time display hand and a motor that moves the hand, and the current time return unit uses the motor to display the hand. It is characterized in that the hand movement is returned at a high hand movement speed higher than the normal hand movement speed.

According to a twenty-first aspect of the present invention, in the first aspect of the present invention, the drive control unit is operable with electric energy supplied from the power supply unit to output a control signal; A drive circuit that operates with energy and receives a control signal to output a drive signal to a driven section. The control circuit includes an oscillation circuit that generates a basic pulse. The operation is stopped.

A twenty-third aspect of the present invention is characterized in that, in the twenty-second aspect of the present invention, the operation stopping unit stops supplying electric energy to the oscillation circuit.

According to a twenty-fourth aspect of the present invention, in the first aspect of the present invention, the drive control unit operates with electric energy supplied from the power supply unit and outputs a control signal; A drive circuit that operates by energy and receives a control signal to output a drive signal to a driven portion. The control circuit includes an oscillation circuit that generates a basic pulse, and a basic pulse output from the oscillation circuit. A frequency dividing circuit for dividing the frequency, and the operation stopping unit stops the operation of the oscillation circuit or the frequency dividing circuit.

According to a twenty-fifth aspect of the present invention, in the twenty-fourth aspect of the present invention, the operation stopping section generates a constant voltage lower than the power supply voltage to drive at least one of the oscillation circuit and the frequency dividing circuit. A constant voltage generating circuit for stopping the supply of electric energy to the constant voltage generating circuit.

According to a twenty-sixth aspect of the present invention, a chargeable power supply unit that supplies electric energy, a drive control unit that is activated by the electric energy supplied from the power supply unit and outputs a drive signal, and an output from the drive control unit A method for controlling an electronic device, comprising: a driven unit that is driven in response to a driving signal to be driven, wherein the operation mode of the driven unit is changed based on a first condition set in advance into a driving mode and a power saving mode. And a mode switching step of switching between the power switching unit and the power saving mode. When the power saving mode is set by the mode switching step, the amount of electric energy stored in the power supply unit based on the second condition set in advance becomes smaller than the predetermined amount of electric energy. And an operation stopping step of stopping the operation of the drive control unit when it is determined that the operation has been performed.

According to a twenty-seventh aspect of the present invention, in the twenty-sixth aspect of the present invention, the power supply unit includes: a power generation device that converts external energy into electric energy; And a power storage device that supplies power to the drive control unit. The power generation device has a power generation state detection step of determining whether the power generation device is in a power generation state. The first condition is that the power generation device It is characterized by being in a state or not.

According to a twenty-eighth aspect of the present invention, in the twenty-seventh aspect of the present invention, the power generation state detecting step includes an energy amount determining step of determining whether an amount of electric energy output from the power generation device exceeds a determination energy amount. And a power generation time determining step of determining whether or not the duration in which the electric energy amount exceeds the determination energy amount exceeds the determination time value in the energy amount determination step.

According to a twenty-ninth aspect of the present invention, in the twenty-sixth aspect of the present invention, there is provided a portable state detecting step of detecting whether or not the electronic device is in a portable state. When switching the operation mode from the driving mode to the power saving mode, the portable state detection step detects that the electronic device is in the non-portable state, and the electronic device has been in the non-portable state for a predetermined time. In this case, when the operation mode of the drive unit is switched from the power saving mode to the drive mode, the operation mode is switched from the non-portable state to the portable state in the portable state detection step.

According to a thirtieth aspect of the present invention, in the twenty-sixth aspect of the present invention, there is provided an electric energy amount detecting step of detecting an amount of electric energy supplied from the power supply unit. The amount of electric energy that can be supplied by the power supply unit detected in the detecting step is smaller than a predetermined amount of electric energy necessary for returning the operation mode of the driven unit from the power saving mode to the driving mode. It is characterized by.

According to a thirty-first aspect of the present invention, in the twenty-sixth aspect of the present invention, the power supply unit further comprises: a power generating device for converting external energy into electric energy; and storing the electric energy supplied from the power generating device. A power storage device that supplies the power to the drive control unit, and a power generation state detection step of detecting whether the power generation device is in a power generation state.When the operation of the drive control unit is stopped by the operation stop step, An operation start step of starting the operation of the drive control unit based on a third condition set in advance, wherein the third condition is that the power generation state detection step detects that the power generation device has started power generation. It is characterized by being.

According to a thirty-second aspect of the present invention, in the thirty-sixth aspect of the present invention, the power supply unit further comprises: a power generator for converting external energy into electric energy; And a power storage device that supplies the electronic device to the drive control unit, and has a portable state detection step of detecting whether or not the electronic device is in a portable state. Further, the operation of the drive control unit is stopped by the operation stop step. An operation start step of starting operation of the drive control unit based on a third condition set in advance is provided, and the third condition is that the electronic device is changed from the non-portable state to the portable state by the portable state detecting step. It is characterized in that the switching is performed.

Next, a preferred embodiment of the present invention will be described with reference to the drawings.
[1] Schematic Configuration FIG. 1 shows a schematic configuration of an electronic timepiece 1 according to an embodiment of the present invention.
The electronic timepiece 1 is a wristwatch, and a user uses a belt connected to the apparatus main body by wrapping it around a wrist.

The electronic timepiece 1 according to the present embodiment includes a power generation unit A that generates AC power, a power supply unit that rectifies an AC voltage output from the power generation unit A, stores a boosted voltage, and supplies electric energy to each component. B, a power generation state detection unit 91 (see FIG. 2) for detecting the power generation state of the power generation unit A, a control circuit 23 for controlling the entire apparatus based on the detection result output from the power generation state detection unit 91, and a second hand. 55, using a stepping motor 10, a second hand moving mechanism CS, an hour / minute hand moving mechanism CHM, which drives minute and hour hands using a stepping motor, and a second hand moving mechanism, receiving a control signal output from the control circuit 23. The second hand drive section 30S for driving the CS, the hour / minute hand drive section 30HM for receiving the control signal output from the control circuit 23 and driving the hour / minute hand movement mechanism CHM, and the operation mode of the electronic timepiece 1. Calendar correction mode from the time display mode, and is largely constituted by comprising an external input device 100 (see FIG. 2) for performing an instruction operation for shifting to the time correction mode or forced power save mode to be described later.

Here, the control circuit 23 supplies a power to the control circuit 23 and the driving units 30S and 30HM (drive circuits) of the fingering mechanisms CS and CHM in accordance with the power generation state of the power generation unit A, thereby displaying the time. (Operation mode) and a power saving mode in which power supply to the second hand movement mechanism CS and the hour / minute hand movement mechanism CHM is stopped and power is supplied only to the control circuit 23. Further, in the control circuit 23, the user holds the electronic timepiece 1 in his / her hand and shakes the electronic timepiece 1 to generate power. When it is detected that the power generation voltage exceeds a predetermined power generation voltage, the mode is switched from the power saving mode to the display mode. ing.

[2] Detailed Configuration Hereinafter, each component of the electronic timepiece 1 will be described. The control circuit 23 will be described later using functional blocks.

[2.1] Power generation unit First, the power generation unit A will be described.
The power generation unit A includes a power generation device 40, a rotary weight 45, and a speed increasing gear 46.
As the power generation device 40, an electromagnetic induction type AC power generation device capable of supplying power induced by a power generation coil 44 connected to the power generation stator 42 with the power generation rotor 43 rotating inside the power generation stator 42 is used. Have been.
The rotary weight 45 functions as a means for transmitting kinetic energy to the power generation rotor 43. The movement of the rotary weight 45 is transmitted to the power generation rotor 43 via the speed increasing gear 46.
In the wristwatch-type electronic timepiece 1, the rotating weight 45 is configured to be able to turn inside the device by capturing the movement of the user's arm or the like, and to generate power using external energy related to the life of the user. The electronic timepiece 1 is driven using the electric power.

[2.2] Power Supply Unit Next, the power supply unit B will be described.
The power supply unit B uses a limiter circuit LM for preventing an excessive voltage from being applied to a subsequent circuit, and a switching element such as a known Schottky diode, a silicon diode, a parasitic diode of a MOSFET built in an IC, or a transistor. A rectifier circuit 47 such as a half-wave rectifier circuit or a full-wave rectifier circuit composed of active elements, a large-capacity capacitor 48, and a step-up / step-down circuit 49.
The step-up / step-down circuit 49 is configured using a plurality of capacitors 49a, 49b and 49c, and receives a charging voltage Vc of the input large-capacity capacitor 48, performs multi-step boosting and stepping-down, and supplies a power supply that becomes a low-potential-side voltage The voltage Vss is output. Then, the step-up / step-down circuit 49 raises / lowers the charging voltage Vc to the power supply voltage Vss by the control signal φ11 output from the control circuit 23, and converts the power supply voltage Vss into the integrated circuit unit 23A of the control circuit 23, the pulse synthesis circuit 22. And the second hand drive section 30S and the hour / minute hand drive section 30HM.
Here, the power supply unit B takes Vdd (high-potential-side voltage) as the reference potential (GND) and generates Vss (low-potential-side voltage) as the power supply voltage.

[2.3] Hand Movement Mechanism Next, the hand movement mechanisms CS and CHM will be described.
[2.3.1] Second hand movement mechanism First, the second hand movement mechanism CS will be described.
Here, the stepping motor 10 used in the second hand movement mechanism CS is also called a pulse motor, a stepping motor, a digital motor, or the like, and is frequently used as an actuator of a digital control device. The stepping motor 10 is driven by a pulse signal. Is what is done. In recent years, small and lightweight stepping motors of this type have been widely used as actuators for small electronic devices or information devices suitable for carrying. Examples of such electronic devices include electronic timepieces, time switches, and chronographs.

The stepping motor 10 of the present embodiment includes a drive coil 11 that generates a magnetic force by a drive pulse supplied from the second hand drive unit 30S, a stator 12 that is excited by the drive coil 11, and a magnetic field that is excited inside the stator 12. And a rotor 13 rotated by the rotation of the rotor.

The rotor 13 is a PM type (permanent magnet rotating type) having a disk-shaped two-pole permanent magnet, and the stator 12 is provided with different magnetic poles around the rotor 13 due to the magnetic force generated by the drive coil 11. A magnetic saturation portion 17 generated in each phase (pole) 15 and 16 is provided.
Further, an inner notch 18 is provided at an appropriate position on the inner periphery of the stator 12 in order to regulate the rotation direction of the rotor 13, so that cogging torque is generated to stop the rotor 13 at an appropriate position. I have.

The rotation of the rotor 13 by the stepping motor 10 is transmitted to the second hand 55 by the train wheel 50 including the second intermediate wheel 51 and the second wheel (second indicating wheel) 52 meshed with the rotor 13, and the second hand 55 indicates the second. Has been done.

[2.3.2] Hour-minute hand movement mechanism Next, the hour-minute hand movement mechanism CHM will be described. The stepping motor 60 used in the hour and minute hand movement mechanism CHM has substantially the same configuration as the stepping motor 10.
The stepping motor 60 of the present embodiment includes a drive coil 61 that generates a magnetic force by a drive pulse supplied from the hour and minute drive unit 30HM, a stator 62 that is excited by the drive coil 61, and is further excited inside the stator 62. And a rotor 63 rotated by a magnetic field.

The rotor 63 is of a PM type (permanent magnet rotating type) having a disk-shaped two-pole permanent magnet. Further, the stator 62 is provided with a magnetic saturation portion 67 in which different magnetic poles generated by the magnetic force generated by the drive coil 61 are generated in respective phases (poles) 65 and 66 around the rotor 63.
Further, an inner notch 68 is provided at an appropriate position on the inner periphery of the stator 62 in order to regulate the rotation direction of the rotor 63, so that cogging torque is generated to stop the rotor 63 at an appropriate position. I have.
The rotation of the rotor 63 of the stepping motor 60 is controlled by the fourth wheel 71, the third wheel 72, the second wheel (minute indicating wheel) 73, the minute wheel 74 and the hour wheel (hour indicating wheel) meshed with the rotor 63. ) 75 are transmitted to each needle. A minute hand 76 is connected to the second wheel & pinion 73, and an hour hand 77 is connected to the hour wheel & pinion 75. The hours and minutes are displayed by these hands in conjunction with the rotation of the rotor 63.

In addition, a transmission system for displaying a date (calendar) (not shown) is displayed on the wheel train 70 (for example, when a date is displayed, a tube intermediate wheel, a date intermediate wheel, a date wheel, a date wheel). Of course, it is also possible to connect a vehicle or the like. In this case, a calendar correction train (for example, a first calendar correction transmission wheel, a second calendar correction transmission wheel, a calendar correction wheel, a date wheel, etc.) may be additionally provided.

[2.4] Second hand drive unit and hour / minute hand drive unit Next, the second hand drive unit 30S and the hour / minute hand drive unit 30HM will be described. Here, since the second hand drive section 30S and the hour / minute hand drive section 30HM have the same configuration, only the second hand drive section 30S will be described with reference to FIG.
Here, the second hand drive section 30S supplies various drive pulses to the stepping motor 10 under the control of the control circuit 23.

The second hand drive unit 30S includes a bridge circuit composed of a P-channel transistor 33a and an N-channel transistor 32a connected in series, and a P-channel transistor 33b and an N-channel transistor 32b. The second hand drive unit 30S includes rotation detection resistors 35a and 35b connected in parallel with the transistors 33a and 33b, respectively, and a sampling P-channel transistor for supplying chopper pulses to the resistors 35a and 35b. 34a and 34b.
Thus, the second hand driving unit 30S applies control pulses having different polarities and pulse widths from the control circuit 23 to the respective gate electrodes of the transistors 32a, 32b, 33a, 33b, 34a and 34b at respective timings. A drive pulse having a different polarity is supplied to the drive coil 11, or a detection pulse for exciting an induced voltage for detecting rotation of the rotor 13 and detecting a magnetic field is supplied.

[2.5] Control Circuit Next, the configuration of the control circuit 23 will be described with reference to FIG. 2. The functional block diagram of FIG. 2 shows the control circuit 23 and its peripheral configuration.
Here, the control circuit 23 includes a pulse synthesis circuit 22, a mode setting unit 90, a time information storage unit 96, a drive control circuit 24, and the like. The mode setting unit 90, the time information storage unit 96, the drive control circuit 24, and the like are formed into a chip by a Vss drive unit 23A driven by the power supply voltage Vss. Vss is supplied. Further, the pulse synthesizing circuit 22 is supplied with a constant voltage output from a constant voltage generating circuit (not shown). The constant voltage generation circuit generates a stable constant voltage by receiving the power supply voltage Vss.

The pulse synthesizing circuit 22 includes an oscillation circuit that oscillates a reference pulse having a stable frequency using the reference oscillation source 21 such as a crystal oscillator, a frequency dividing circuit that divides the reference pulse, a frequency dividing pulse and a reference pulse. And a synthesizing circuit for generating pulse signals having different pulse widths and timings by synthesizing the signals. Here, a constant voltage is supplied to the pulse synthesizing circuit 22, and the constant voltage circuit receives a power supply voltage Vss (charging voltage Vc) output from the power supply unit B and outputs a constant voltage (shown in FIG. )). On the other hand, when the supply of the power supply voltage (constant voltage) is stopped, the pulse synthesis circuit 22 stops generating the pulse signal and stops the operation of the entire control circuit 23.

Next, the mode setting section 90 includes a power generation state detection section 91, a set value switching section 95 for switching a set value used for detection of the power generation state, and a voltage detection circuit 92 for detecting the charging voltage Vc of the large-capacity capacitor 48. And a central control circuit 93 that controls the time display mode according to the power generation state and controls the boosting ratio based on the charging voltage Vc, and a mode storage unit 94 that stores the mode.
The power generation state detection unit 91 compares the electromotive voltage Vgen of the power generation device 40 with the set voltage value V0 to determine whether or not the power generation state is established. A second detection circuit 98 is provided for determining a stable power generation state by comparing the time Tgen with the set time value T0 by setting the time during which the power generation device 40 is in the power generation state by the circuit 97 as the power generation continuation time Tgen. ing.

Here, a specific circuit configuration of the power generation state detection unit 91 will be described with reference to FIG. FIG. 10 is a circuit configuration example around the power generation detection circuit when performing full-wave rectification.
In FIG. 10, a power generation state detection unit 91, a power generation device 40 that performs AC power generation, and a rectification that rectifies an AC current output from the power generation device 40 and converts the AC current into a DC current as peripheral circuits of the power generation state detection unit 91 FIG. 3 illustrates a circuit section 47 and a high-capacity secondary power supply 48 that stores power by a DC current output from the rectifier circuit section 47.

The power generation state detection unit 91 compares the voltage V1 of the first output terminal AG1 of the power generation device 40 with the high potential side terminal voltage VDD of the high capacity secondary power supply 48, and outputs the first comparison result data DC1. A comparator COMP1A, a second comparator COMP2A that compares the voltage V2 of the second output terminal AG2 of the power generator 40 with the high-potential-side terminal voltage VDD of the high-capacity secondary power supply 48, and outputs second comparison result data DC2; , An OR circuit OR1 for calculating the logical sum of the first comparison result data DC1 and the second comparison result data DC2 and outputting the result as power generation detection data DDET.

When the power generation device 40 generates power, the power generation state detection unit 91 determines whether or not power generation capable of charging the high-capacity secondary power supply 48 is performed based on the power generation state of the power generation device 40 and the operation state of the LM. Then, the power generation detection data DDET having a frequency corresponding to the power generation cycle is output to the central control circuit 93.

Next, another specific circuit configuration of the power generation state detection unit 91 will be described with reference to FIG. The power generation state detection circuit unit 91 includes a transistor 91A and a capacitor 91B connected in series between a signal line having a high potential side voltage Vdd and a signal line having a low potential side voltage Vss, and two terminals connected to both ends of the capacitor 91B. A connected pull-down resistor 91C, a detection inverter 91E connected to a connection point 91D between the transistor 91A and the capacitor 91B, and a charging current detection circuit DET connected between the plus side of the large capacity capacitor 48 and Vdd. It is composed of

When the charging current flows from the rectifier circuit 47 toward the large-capacity capacitor 48, the current also flows through the charging current detection circuit DET. For example, when the charging current detection circuit DET is configured by a diode, the forward current flows. A voltage VF is generated. When the voltage VF is higher than the threshold voltage Vth of the transistor 91A, the transistor 91A is turned on and the capacitor 91B is charged. Further, the voltage VA at the connection point 91D approaches the high potential side voltage Vdd from the low potential side voltage Vss, and this state continues to some extent by the pull-down resistor 91C, so that the potential of the voltage VA becomes the threshold of the detection inverter 91E. When the value is exceeded, the output switches from "L" to "H".

By configuring the power generation state detection unit 91 in this manner, the threshold voltage Vth of the transistor 91A, the pull-down resistor 91C, and the threshold value of the detection inverter 91E are appropriately selected, so that a set voltage value V0 described later can be obtained. The set time value T0 is set, and the power generation state of the power generation device 40 is detected.
Then, the power generation state detection unit 91 determines that the power generation unit A is in the power generation state when the conditions of both the first detection circuit 97 and the second detection circuit 98 are satisfied. Here, the set voltage value V0 is a negative voltage based on Vdd (= GND), and indicates a potential difference from Vdd.

Here, the set voltage value V0 used for the first detection circuit 97 is controlled to be switched by the set value switching unit 95. When the set value switching unit 95 switches from the display mode to the power saving mode, The value of the set voltage value V0 used for the first detection circuit 97 is changed. That is, in this example, the set voltage value Va is set in the display mode, and the set voltage value Vb is set in the power saving mode, and this relationship is set to Va <Vb.
Therefore, large power generation is required to switch from the power saving mode to the display mode. Note that the set value switching unit 95 may switch the set time value T0 used in the second detection circuit 98.

Here, an example of the voltage detection circuit 92 will be described with reference to FIG.
The voltage detection circuit 92 includes resistors R1 and R2 connected in series for dividing a voltage between the high-potential-side power supply VDD and the low-potential-side power supply VSS at a predetermined division ratio to generate a detection target voltage VDET. A reference voltage generator 92A that generates a predetermined reference voltage VREF from the potential side power supply VDD, a detection target voltage VDET which is a voltage at a connection point between the resistors R1 and R2, and a reference voltage VREF are compared to generate voltage detection data DV. The comparator 92B output to the central control circuit 93 and the sampling signal SP (“L” level at the time of detection) output from the central control circuit 93 turn on at the voltage detection timing to supply current to the resistors R1 and R2. The 1P channel MOS transistor 92C and the sampling signal SP (“L” level at the time of detection) output from the central control circuit 93 turn off the voltage at the voltage detection timing. A state is configured to include a first 2P channel MOS transistor 92D which an operating state of the comparator 92B the enable terminal EN as "H" level of the comparator 92B, the.
When the “L” level sampling signal SP is input from the central control circuit 93 to the voltage detection circuit 92, the first P-channel MOS transistor 92C and the second P-channel MOS transistor 92D are turned on.
As a result, power is supplied to the resistors R1 and R2, and the resistors R1 and R2 divide the voltage between the high-potential power supply VDD and the low-potential power supply VSS at a predetermined division ratio to generate a detection target voltage VDET. Apply to the inverting input terminal of the comparator.

On the other hand, the enable terminal EN of the comparator 92B also becomes “H” level, and the comparator 92B compares the detection target voltage VDET with the reference voltage VREF and outputs the voltage detection data DV to the central control circuit 93.
Further, the central control circuit 93 includes a non-power generation time measuring circuit 99 for measuring a non-power generation time Tn during which power generation is not detected by the detection circuits 97 and 98. When the non-power generation time Tn continues for a predetermined time or more, the display mode is set. To the power saving mode (first condition).

On the other hand, when returning from the power saving mode to the display mode, the power generation state detection unit 91 detects that the power generation unit A is in the power generation state, and the charging voltage Vc of the large capacity capacitor 48 returns to the display mode from the power saving mode. This is executed when a condition (first condition) that sufficient electric energy remains for the operation is satisfied.
However, if the limiter circuit is operating (turning on) in the power saving mode, a short-circuit path different from the normal charging path is formed, and the power generation unit A is in a short-circuit state. Even if the unit A is in the power generation state, it cannot be detected, and it is not possible to shift from the power saving mode to the display mode.

Therefore, in the present embodiment, in the power saving mode, the limiter circuit is turned off (open) regardless of the power generation state of the power generation unit A, and the power generation state detection unit 91 changes the power generation state of the power generation unit A. It is designed so that it can be detected reliably.
Further, since the power supply section B of the present embodiment includes the step-up / step-down circuit 49, the power supply voltage is stepped up using the step-up / step-down circuit 49 even when the charging voltage Vc is somewhat low, thereby driving the hand movement mechanisms CS and CHM. It is possible to do.

On the other hand, even if the charging voltage Vc is somewhat high and is higher than the driving voltage of the hand movement mechanisms CS and CHM, the power supply voltage is stepped down using the step-up / step-down circuit 49, whereby the hand movement mechanisms CS and CHM can be driven. It is. Therefore, the central control circuit 93 determines the step-up / step-down ratio based on the charging voltage Vc, and controls the step-up / step-down circuit 49.
However, if the charging voltage Vc is too low, a power supply voltage that can operate the hand movement mechanisms CS and CHM cannot be obtained even if the charging voltage Vc is increased. In such a case, when the mode is shifted from the power saving mode to the display mode, accurate time display cannot be performed, and wasteful power is consumed.

Therefore, in the present embodiment, it is determined whether the charging voltage Vc is sufficient by comparing the charging voltage Vc with a predetermined set voltage value Vb, and this is shifted from the power saving mode to the display mode. Is the first condition for this.

Further, for example, when the user operates the external input device 100 or when the non-power generation state is detected by the power generation detection unit 91, the central control circuit 93 performs an instruction operation of shifting to a predetermined forced power saving mode. A power saving mode counter 101 for monitoring whether or not the operation is performed within a predetermined time.
The mode set in this way is stored in the mode storage unit 94, and the information is supplied to the drive control circuit 24, the time information storage unit 96, and the set value switching unit 95.

Here, in the drive control circuit 24, when the display mode is switched to the power saving mode, the supply of control signals to the second hand drive unit 30S and the hour / minute hand drive unit 30HM is stopped, and the second hand drive unit 30S and the hour / minute hand drive are stopped. The operation of the unit 30HM is stopped. As a result, the motors 10 and 60 do not rotate, and the time display stops.
Further, when the power supply voltage becomes smaller than a predetermined amount of electricity required for returning from the power saving mode to the display mode by the processing described later, the central control circuit 93 sends the control circuit It has a function of an operation stopping means for stopping supply of voltage to the drive unit 23 and the drive units 30S and 30HM.
By this processing, even when there is not enough electric energy in the large-capacity capacitor 48 to return from the power saving mode to the display mode, discharge from the large-capacity capacitor 48 is reduced, and wasteful consumption of electric charge is reduced. I have minimized it.

Next, the time information storage section 96 is more specifically configured by an up / down counter (not shown). When the display mode is switched to the power saving mode, the time information storage section 96 stores the reference signal generated by the pulse synthesis circuit 22. Then, the time measurement is started and the count value is increased (up-count), and the duration of the power saving mode is measured as the count value.
When the mode is switched from the power saving mode to the display mode, the count value of the up / down counter is reduced (down counting). During the down counting, the count value is supplied from the drive control circuit 24 to the second hand driving unit 30S and the hour / minute hand driving unit 30HM. Output a fast-forward pulse.
Then, when the count value of the up / down counter is zero, that is, when the continuation time of the power saving mode and the fast-forward hand movement time corresponding to the elapsed time during the fast-forward hand movement have elapsed, a control signal for stopping the transmission of the fast-forward pulse is generated. The control signal is supplied to the second hand drive section 30S and the hour / minute hand drive section 30HM. As a result, the time display is returned to the current time. As described above, the time information storage unit 96 also has a part of the function of the current time return / return means for returning the redisplayed time display to the current time.

Next, the drive control circuit 24 generates a drive pulse according to the mode based on various pulses output from the pulse synthesis circuit 22. First, in the power saving mode, the supply of the driving pulse is stopped. Next, immediately after switching from the power saving mode to the display mode, in order to return the re-displayed time display to the current time, the second hand driving unit 30S and the hour hand use a fast-forward pulse with a short pulse interval as a driving pulse. It is supplied to the minute hand drive unit 30HM (current time return means).
Further, after the supply of the fast-forward pulse is completed, a drive pulse having a normal pulse interval is supplied to the second hand drive unit 30S and the hour / minute hand drive unit 30HM.

Reference numeral 120 denotes a portable state detection circuit including an angular velocity sensor, a heat sensor, and the like. The portable state detection circuit 120 detects whether or not the electronic timepiece 1 is wrapped around the user's wrist so that the power generation device 40 generates electric power. This is to indirectly detect whether or not it is in the state. Further, the portable state detecting circuit 120 is connected to a non-portable time measuring circuit 121 provided in the central control circuit 93. The non-portable time measuring circuit 121 is substantially similar to the non-power generating time measuring circuit 99 described above. Measures non-portable time.
Here, the portable state detection circuit 120 and the non-portable time measurement circuit 121 are applied instead of the power generation state detection unit 91 and the non-power generation time measurement circuit 99.

[3] Operation of Embodiment An operation process of the electronic timepiece 1 according to the embodiment will be described with reference to FIG.
First, the control circuit 23 determines whether or not the apparatus is in the power saving mode (step S1). If it is determined in step S1 that the electronic timepiece 1 is in the power saving operation mode (step S1; YES), the process proceeds to step S5 described below.
On the other hand, if it is not in the power saving mode in the determination in step S1, that is, if it is in the display mode (step S1; NO), the central control circuit 93 sets the power supply voltage based on the detection signal of the power generation state detection device 91. It is determined whether or not there is, that is, whether or not the power generation device 40 is generating power (step S2). If it is determined in step S2 that the power generation device 40 is in the power generation state, a time display process in step S10 described below is performed.

If it is determined in step S2 that the power generation device 40 is in the non-power generation state (step S2; NO), the non-power generation time Tn is counted up by the non-power generation time measurement circuit 99 of the central control circuit 93 (step S2). Step S3). Then, the central control circuit 93 determines whether or not the non-power generation time Tn continues beyond a predetermined set time (step S4).
If it is determined in step S4 that the non-power generation time Tn has not continued beyond the predetermined set time (step S4; NO), the process returns to step S2, and the processes from step S2 to step S4 are repeated. .

If it is determined in step S4 that the non-power generation time Tn has continued beyond the predetermined set time (step S4; YES), the mode is switched to the power saving mode (step S5).
On the other hand, in the power saving mode, the time information storage unit 96 counts up time information corresponding to the elapsed time in the power saving mode in order to perform a time return process (step S9) described later (step S6).
Then, it is determined whether or not the power supply voltage (the charging voltage Vc of the large-capacity capacitor 48 in the present embodiment) is higher than the determination voltage V1 necessary for returning from the power saving mode to the display mode (step S7) (step S7). Condition 2). In the determination in step S7, if the charging voltage Vc is higher than the determination voltage V1 (step 7; YES), that is, if it is possible to return from the power saving mode to the display mode, it is determined whether the power generation device 40 is generating power again. Is determined (step S8). If it is determined in step S8 that there is no power generation (step S8; NO), the processes in steps S6 and S7 are repeated.

If it is determined in step S8 that the power generation has been started (step S8; YES), the time is returned from the power saving mode to the display mode, and the time is returned based on the count value of the time information storage unit 96. Is performed, and the hands 55, 76, and 77 are also driven as usual (step S10). Note that the time return process from the power saving mode to the display mode is a current time return process that is performed more quickly than a normal driving operation.

On the other hand, in the determination in step S7, when the charging voltage Vc stored in the large-capacity capacitor 48 is equal to or lower than the determination voltage V1 (step S7; NO), that is, the charging voltage Vc of the large-capacity capacitor 48 returns from the power saving mode to the display mode. If the voltage drops to a level that cannot be achieved, the supply of the charging voltage Vc supplied from the large-capacity capacitor 48 to the step-up / down circuit 49 is stopped, and the power supply voltage Vss output from the step-up / down circuit 49 The supply to the unit 23A, the pulse synthesizing circuit 22, and the driving units 30S and 30HM is stopped (step S11).

In step S11, the supply of the power supply voltage Vss to the Vss driving unit 23A, the pulse synthesizing circuit 49, and the driving units 30S and 30HM of the control circuit 23 is stopped, so that the generation of the pulse signal in the pulse synthesizing circuit 22 is stopped. The counting up in the time information storage unit 96 is stopped. As a result, the control circuit 23 reduces the consumption of electric energy to zero. For example, the electric energy consumption when the power saving mode is executed can be reduced by about 80% with respect to the power consumption when the display mode is executed. In this state, the electric energy consumption is further cut to 99.5%. can do. Further, in the Vss drive unit 23A, only the power generation state detection unit 91 does not stop the supply of the power supply voltage Vss, and if the supply of the power supply voltage Vss is continued, the circuit operation at the time of restarting may be stabilized. it can.

Further, in step S12, whether or not the power generation device 40 has resumed power generation is monitored by the power generation state detection unit 91 (third condition) until the power generation state detection unit 91 detects that power generation has started. , And waits in this step S12.
Here, when the power generation state detection unit 91 detects that the power generation has been restarted (step S12; YES), the charging voltage Vc supplied from the large-capacity capacitor 48 is supplied to the step-up / step-down circuit 49. From 49, the power supply voltage Vss is supplied to the Vss driving unit 23A, the pulse synthesizing circuit 22, and the driving units 30S and 30HM of the control circuit 23 to restart the electronic timepiece 1.

In step S12, the voltage detection circuit 92 detects the charging voltage Vc of the large-capacity capacitor 48, and determines whether or not the voltage has the minimum voltage necessary for restarting. The charging of the large-capacity capacitor 48 can be accelerated by stopping the supply of the charging voltage Vc until the charging voltage Vc is reached.

Further, in this case, since the control circuit 23 is also stopped, the time recovery processing cannot be performed, so that the user needs to manually set the time.
Further, using specific numerical values, according to the prior art, when the charging voltage Vc of the large-capacity capacitor 48 drops to about 0.45 V, the large-capacity capacitor 48 is fully charged after power generation is started. In order to make the state, the electronic timepiece 1 had to be shaken about 300 times. However, in the present embodiment, since the determination voltage V1 is set to 1 V and the charging voltage Vc is hardly reduced below 1 V, it is necessary to set the large-capacity capacitor 48 to a fully charged state after starting the power generation. The electronic timepiece 1 only needs to be shaken about 100 times, and the electronic timepiece 1 can be easily restarted.

[4] Effects of the Embodiment As described above, in the electronic timepiece 1 according to the present embodiment, the electronic timepiece 1 outputs the charging voltage Vc from the large-capacity capacitor 48 to the step-up / step-down circuit 49, When the power supply voltage Vss obtained by stepping up / down the charging voltage Vc from the step-up / step-down circuit 49 is supplied only to the control circuit 23, the charging voltage Vc of the large-capacity capacitor 48 is required to return from the power saving mode to the display mode. When the voltage falls below the threshold voltage V1, the supply of the charging voltage Vc output from the large-capacity capacitor 48 to the step-up / step-down circuit 47 is stopped. The supply of the power supply voltage Vss supplied to the driving unit 23A, the pulse synthesizing circuit 22, and the driving units 30S and 30HM is stopped.

Thus, wasteful consumption of electric energy in the large-capacity capacitor 48 can be eliminated, and the charging voltage Vc of the large-capacity capacitor 48 can be maintained. As a result, when the power generation device 40 starts generating power, the charging voltage Vc of the large-capacity capacitor 48 is output to the step-up / step-down circuit 49, so that the power supply voltage Vss is output from the step-up / step-down circuit It is supplied to the Vss driving section 23A, the pulse synthesizing circuit 22, and the driving sections 30S and 30HM, so that the electronic timepiece 1 can be quickly restarted.
In addition, when the wasteful consumption of the charging voltage Vc of the large-capacity capacitor 48 is suppressed, and when the user starts power generation with the power generation device 40 by carrying the electronic timepiece 1, the hands 55 can be quickly operated, and If the timepiece 1 is out of order, it is possible to prevent the point from being set earlier.

[5] Modified Example of Embodiment [5.1] First Modified Example As shown in FIG. 5, this first modified example is supplied to a constant voltage driving circuit 200 (for example, an oscillation circuit, a frequency dividing circuit, etc.). Is a constant voltage Vreg set by the constant voltage generation circuit 201.
Here, the constant voltage generation circuit 201 will be described.
FIG. 12 shows a configuration diagram of the constant voltage generation circuit 201.

The constant current generation circuit 201 is roughly classified into a constant current source 220 such as a depletion transistor that generates a constant current IREF, a first current mirror circuit 221 that generates the same current as the constant current IREF, and a constant current IREF. A differential amplifier circuit 222 for differentially amplifying the reference voltage V1 and the generated voltage V2 generated by flowing, a second current mirror circuit 223 for making the current flowing through each part of the differential amplifier circuit 222 a constant current; And a constant voltage generator 224 that generates and outputs a constant voltage VREG based on the output of the differential amplifier circuit 222.

The first current mirror circuit 221 has P-channel MOS transistors MP1, MP2, and MP3 whose sources S are commonly connected to the high-potential-side power supply VDD and whose gate terminals G are commonly connected. And the drain D are connected in a saturated connection.

The differential amplifier circuit 222 has a source S connected to the drain D of the P-channel MOS transistor MP2, a gate G connected to the drain D of the P-channel MOS transistor MP1, a P-channel MOS transistor MP4, and a source S connected to the P-channel MOS transistor MP1. A P-channel MOS transistor MP5 connected to the drain D of the transistor MP2 and a gate G connected to the drain D of the P-channel MOS transistor MP3; and a gate potential holding capacitor CGK connected at one end to the drain of the P-channel MOS transistor. , Is configured.

The second current mirror circuit 223 includes an N-channel MOS transistor MN3 having a drain D connected to the drain D of the P-channel MOS transistor MP4, a source S connected to the lower potential power supply VSS, and a gate G connected to the N-channel MOS transistor MP4. An N-channel MOS transistor MN4 connected to the gate G of MN3, a drain D connected to the drain D of the P-channel MOS transistor MP5 and the gate G of the N-channel MOS transistor MN3, and a source S connected to the lower potential power supply VSS side. And is provided.

The constant voltage generating section 224 has an N-channel having a drain G connected to the gate G, a drain D connected to the drain D of the P-channel MOS transistor MP3, and a source S connected to the other end of the gate potential holding capacitor CGK. A drain D is connected to the source S of the MOS transistor MN1 and the source S of the N-channel MOS transistor MN1, a source S is connected to the lower potential power supply VSS, and a gate G is connected to one end of the gate potential holding capacitor CGK. And a transistor MN2. A connection point between the source S of the N-channel MOS transistor MN1 and the drain of the N-channel MOS transistor MN2 is an output terminal of the constant voltage VREG.

Next, the general operation of the constant voltage generation circuit 201 will be described.
The first current mirror circuit 221 generates the same current as the constant current IREF generated by the constant current source 220 (indicated by the same symbol IREF in the figure) as the source-drain current of the P-channel MOS transistor MP3, and generates the constant voltage. It is supplied to the generator 224.
At this time, the relationship between the drain current Ids of the P-channel MOS transistor MP1 and the gate voltage is expressed by the following equation.
Ids = β · W / (2 · L) · (Vgs−Vth) 2
Here, β is a gain constant.

In parallel with this, the differential amplifier circuit 222 performs differential amplification of the reference voltage V1 and the voltage V2, and outputs the result to the constant voltage generator 224.
At this time, the source-drain currents of the P-channel MOS transistor MP4 and the P-channel MOS transistor MP5 have the same current value by the second current mirror circuit.
The constant voltage generator 224 generates the reference voltage V1 and the voltage V2 based on the output of the differential amplifier circuit 222.
V1 = V2
The feedback control is performed so that
As a result, the threshold voltage VTP of the P-channel MOS transistor MP1 constituting the first current mirror circuit 221, the threshold voltage VTN of the N-channel MOS transistor MN1 of the constant voltage generator 224, and the constant voltage Vreg determined by the constant current IREF Will occur.

By the way, as described above, when the voltage supplied to the constant voltage driving circuit 200 (for example, an oscillation circuit, a frequency dividing circuit, etc.) is the constant voltage Vreg set by the constant voltage generating circuit 201, the large capacity capacitor 48 And a central control circuit 93, a latch circuit 202, and a P-channel transistor 203 connected between the output side of the latch circuit 202 and the middle of the high potential side Vdd line. These elements constitute operation stopping means separately from the central control circuit 93. When the high-potential-side voltage Vdd is set to the reference potential (GND), the low-potential voltage Vss becomes the power supply voltage, and this potential difference becomes the charging voltage Vc.
Further, the oscillation circuit and the frequency dividing circuit are driven by the constant voltage Vreg output from the constant voltage generating circuit 201.

Here, in the central control circuit 93, in the power saving mode, the power supply voltage (the charging voltage Vc of the large-capacity capacitor 47) is monitored by the voltage detection circuit 92, and when the voltage falls below a predetermined voltage value, "L" is latched. Output to 202. The latch circuit 202 receives the signal output from the power generation state detection unit 91 and the signal output from the central control circuit 93, outputs a signal that becomes “H” to the transistor 203, and turns off the transistor 203. To Then, the supply of the charging voltage Vc of the large capacity capacitor 48 to the central control circuit 93, the voltage detection circuit 92, the constant voltage generation circuit 201, and the like is stopped. As a result, in the constant voltage generating circuit 201, the constant voltage Vreg output in response to the charging voltage Vc is stopped, and the operation of the constant voltage driving circuit 200 is stopped.
Further, in the power saving mode, the driving units 30S and 30HM are stopped, and most of the current consumption of the circuit is controlled by the constant voltage driving circuit 200 and the constant voltage generating circuit 201 such as the oscillation circuit and the frequency dividing circuit for generating the reference pulse signal. By stopping the supply of the constant voltage Vreg to the constant voltage driving circuit 200, the current consumption in the constant voltage driving circuit 200 can be reduced to zero, and the power supply voltage Vss to the constant voltage generating circuit 201 can be further reduced. Is stopped, the current consumption of the entire circuit can be reduced to almost zero.

When the power generation state detection unit 91 detects that the power generation unit A has started power generation and a signal that becomes “H” is input to the latch circuit 202, the transistor 203 is turned on, and the charging voltage Vc Is supplied to the central control circuit 93, the voltage detection circuit 92, the constant voltage generation circuit 201, and the like. Since the large-capacity capacitor 48 holds a voltage having a margin for starting oscillation, the rising of the oscillation start can be made earlier. Thereby, the electronic timepiece 1 can be easily restarted.
Note that when the supply of the power supply voltage Vss is stopped by turning off the transistor 203, the output of the latch circuit 202 becomes unstable. Therefore, in order to surely turn off the transistor 203, it is preferable to connect a pull-up resistor having a high resistance value to the gate terminal side of the transistor 203.

[5.2] Second Modification In the first modification, the transistor 203 is connected in the middle of the line to which the high-potential-side voltage Vdd is supplied so as to cut off the supplied current. As the transistor 203, a transistor having a relatively large capacity had to be used. Therefore, the second modification can be realized by configuring the operation stopping means as shown in FIG.
The oscillation circuit 301, the frequency dividing circuit 302, and the level shifter 303 embody the constant voltage driving circuit 200 driven by the constant voltage Vreg. In this modification, a line having the high-potential-side voltage Vdd is referred to as a reference line a, a line having a low-potential-side voltage Vss is referred to as a power supply line b, and a line having a constant voltage Vreg serving as a constant potential is referred to as a constant voltage line c. I do.

Here, a P-channel transistor 304 is connected between the lines a and c, and a P-channel transistor 305 is connected between the line b and the constant voltage circuit 92. The output side of the circuit 92 is connected. The gate of the transistor 304 is connected to the output of the central control circuit 92. Note that the operation stop means is constituted by the transistor 304 and the transistor 305.
In the circuit configuration according to the second modification configured as described above, when the electronic timepiece 1 is in the power saving mode, the power generation state of the power generation unit A is monitored by the power generation state detection unit 91, and the power generation unit A enters the non-power generation state. At this time, a signal that becomes “L” is output to the transistor 304 and the transistor 305. Accordingly, the transistor 304 is turned on to short-circuit the reference line a and the constant voltage line c, thereby stopping the constant voltage reg supplied to the oscillation circuit 301, the frequency dividing circuit 302, and the level shifter 303. At about the same time, a signal of "L" is also input to the transistor 305, so that the transistor 305 is turned off, and the charging voltage Vc supplied from the large-capacity capacitor 48 to the constant voltage generating circuit 92 is stopped. The supply of the voltage Vreg also stops.

On the other hand, when power generation is started, a signal of “H” is output from the central control circuit 93, turning off the transistor 304 and turning on the transistor 305 to operate the constant voltage generating circuit 92. To supply a constant voltage Vreg. Thus, the constant voltage Vreg is also supplied to the oscillation circuit 301, and the oscillation circuit 301 generates a reference pulse.
Moreover, in this circuit configuration, a transistor having a relatively low withstand voltage can be used as the transistor, and the current consumption in the constant voltage generation circuit 92 can be reduced to almost zero by stopping the supply of the charging voltage Vc.

In order to stop the supply of the constant voltage Vreg, the transistor 304 is turned on. However, the transistor is connected in the middle of the constant voltage line c, the transistor is turned off, and the supply of the charging voltage is stopped. You may make it. Further, the latch circuit 202 shown in the first modification may be built in the central control circuit 92.
Further, in the above description, the on / off operation of the transistor 304 and the off / on operation of the transistor 305 are performed simultaneously. However, it is better to provide a delay circuit before the gate of the transistor 304 and operate the transistor 305 first. preferable.

[5.3] Third Modified Example Next, a third modified example will be described with reference to FIGS. 7 and 8. In this modification, generation of a reference pulse generated from an oscillation circuit is stopped.
First, although the circuit configuration around the power supply is almost the same as that of the second modification, the operation stopping means including the transistors 304 and 305 is not connected, and the central control circuit 93 and the oscillation circuit 401 They are connected by a signal line d for outputting a circuit drive signal.

Next, a circuit configuration of the oscillation circuit 401 incorporated in the electronic timepiece 1 will be described with reference to FIG.
At both ends of the crystal oscillator 402, a reference line a serving as a high-potential-side voltage Vdd is connected via a drain capacitor 403 and a gate capacitor 404, and a series circuit including a drain resistor 405 and a feedback resistor 406 is connected. ing. Further, between the reference line a and the constant voltage line c, a P-channel transistor 407, an N-channel transistor 408, and a P-channel transistor 409 are sequentially connected from the reference line a side. Further, the gates of the transistors 407 and 408 are connected to a connection point between the gate capacitance 404 and the feedback resistor 406, the drain of the transistor 407 and the drain of the transistor 408 are connected to the drain resistor 405, and the gate of the transistor 409 is It is connected to the output side of the central control circuit 93. On the other hand, a connection point between the drain resistor 405 and the feedback resistor 406 is connected to the frequency dividing circuit 302.

In the oscillation circuit 401, components other than the crystal oscillator 402 are integrated by an IC, and an oscillation inverter is configured by circuit elements other than the crystal oscillator 402, the transistor 409, and the feedback resistor 406.
In the circuit configuration according to the third modification configured as described above, when the electronic timepiece 1 is in the display mode or the power saving mode, the oscillation circuit output from the central control circuit 93 to the gate of the transistor 409 via the signal line d. The drive signal becomes “H”, supplies a constant voltage Vreg to the oscillation inverter, and outputs a reference pulse to the frequency dividing circuit 302 using the natural oscillation of the crystal oscillator 402.

In addition, when the electronic timepiece 1 is in the power saving mode, the power generation state of the power generation unit A is monitored by the power generation state detection unit 91, and when the power generation unit A is in the non-power generation state, the oscillation circuit drive becomes “L”. A signal is output to the gate of the transistor 409, so that the transistor 409 is turned off. Then, the supply of the constant voltage Vreg to the oscillation inverter is stopped, and the reference pulse generated from the oscillation circuit 401 is stopped. As a result, current consumption in each circuit can be reduced.

On the other hand, when the power generation state detection unit 91 detects that the power generation unit A has started power generation, the central control circuit 93 outputs an oscillation circuit drive signal that becomes “H” to the gate of the transistor 409 via the signal line d. The constant voltage Vreg is supplied to the oscillation inverter, and the reference pulse is output from the oscillation circuit 401 to the frequency dividing circuit 302.

[5.4] Fourth Modified Example In the fourth modified example, as shown in the flowchart of FIG. 9, the determination voltage for shifting from the power saving mode to the stop of the voltage supply is changed to the above-described determination voltage V1 (hereinafter referred to as the first voltage). Is determined based on a second determination voltage V2 (hereinafter referred to as a second determination voltage V2) lower than the second determination voltage V1) and a determination counter value T1 at this time. V2 is a voltage value required for the hands 55, 76, and 77 to rotate substantially 180 degrees when returning from the power saving mode to the display mode, and the determination counter value T1 is the counter value at this time.

Here, the processing from step S21 to step S30 is substantially the same as the processing from step S1 to step S10 in FIG. 4, and therefore the description thereof is omitted.
In the determination in step S27, when the charging voltage Vc of the large-capacity capacitor 48 is equal to or lower than the first determination voltage V1 (step S27; NO), that is, the voltage of the large-capacity capacitor 48 becomes a voltage that cannot return from the power saving mode to the display mode. If it is determined that the value of the time counter T has exceeded the determination counter value T1, it is determined (step S31).

If the value of the counter T exceeds the determination counter value T1 in step S31, the process proceeds to step S33, and the processing after step S33 is performed. If not, the processing in step S32 is performed. That is, in step S32, it is determined whether or not the charging voltage Vc is higher than the second determination voltage V2. If the charging voltage Vc is lower than the second determination voltage V2 (step S32; NO), that is, the large capacity If there is not enough electric energy remaining in the capacitor 48 to return the hands 55, 76, and 77, the supply of voltage to the control circuit 23 and the driving units 30S and 30HM is stopped in step S33.
Further, in step S34, whether or not the power generation device 40 has started power generation is monitored by the power generation state detection unit 91, and the process waits in step S34 until the power generation state detection unit 91 detects that power generation has started. I do. On the other hand, when the power generation state detection unit 91 detects that power generation has started (step S34; YES), the charging voltage Vc supplied from the large-capacity capacitor 48 is supplied to the control circuit 23 and the driving units 30S and 30HM. Then, the electronic timepiece 1 is operated (step S35).

On the other hand, in the determination in step S32, when the charging voltage Vc is higher than the second determination voltage V2 (step S32; YES), that is, electric energy sufficient to return the hands 55, 76, 77 to the large-capacity capacitor 48. If the power generation remains, the count-up of the time is continued in step S36, and in step S37, it is monitored via the power generation state detection unit 91 whether or not the power generation has been started. Repeat the process from.
If it is determined in step S37 that power has been generated, the process proceeds to step S38 to perform a process of returning to the current time.
As described above, in this modification, after the charging voltage Vc becomes lower than the first determination voltage V1, the value T of the time counter further becomes larger than the determination counter value T1, or the charging voltage Vc becomes the second voltage. When the voltage becomes lower than the determination voltage V2, the voltage supply is stopped. As a result, it is possible to provide a time interval before the supply of the charging voltage Vc is stopped, and to suppress the supply of the charging voltage Vc as much as possible, and to display the current time from the power saving mode when power generation is started. It returns to the mode.

[5.6] Sixth Modification In the above embodiment, an electronic timepiece that displays hours, minutes, and seconds with two motors has been described as an example, but the hours, minutes, and seconds are displayed with one motor. The present invention can be applied to an electronic timepiece that performs the above.
Conversely, the present invention is also applicable to an electronic timepiece having three or more motors (motors for individually controlling the second hand, minute hand, hour hand, calendar, chronograph, and the like).

[5.7] Seventh Modification In the above embodiment, the display mode is automatically switched to the power saving mode. However, when the user operates the external input device 100, for example, a specific It is also possible to detect that the operation has been performed and to forcibly switch from the display mode to the power saving mode or switch from the power saving mode to the stop of the voltage supply. Further, the stop and start of the supply of the electric energy from the power supply unit B may be performed according to the operation state of the external input device 100.

[5.8] Eighth Modification In the above-described embodiment, the power generation state detector 91 monitors whether the power generation device 40 is in a power generation state or a non-power generation state. When the mobile device is in the non-portable state, the power generation device 40 may be indirectly monitored as being in the non-power-generating state.

[5.9] Ninth Modification In the above embodiment, the voltage detection circuit 92 monitors the charging voltage Vc of the large-capacity capacitor 48, and supplies the electric energy when the charging voltage Vc becomes equal to or lower than the determination voltage V1. However, the present invention is not limited to this, and the supply of electric energy may be stopped by monitoring the power supply voltage Vss output from the step-up / step-down circuit 49.

[5.10] Tenth Modification In the above embodiment, the wristwatch-type electronic timepiece 1 has been described as an example. However, the present invention is not limited to this. It can be applied to various portable electronic devices such as personal computers, PDAs, liquid crystal televisions, and portable VTRs.

[5.11] Eleventh Modification In the above-described embodiment, the power generation device 40 is configured to transmit the rotational motion of the rotary weight 45 to the rotor 43 and generate an electromotive force Vgen in the output coil 44 by the rotation of the rotor 43. Although the present invention employs a power generation device, the present invention is not limited to this. For example, a power generation device that generates a rotating motion by a spring restoring force (corresponding to external energy) and generates an electromotive force by the rotating motion. A device or a power generating device that generates electric power by a piezoelectric effect by applying external or self-excited vibration or displacement (corresponding to external energy) to a piezoelectric body may be used.

Further, a power generation device that generates electric power by photoelectric conversion using light energy (equivalent to external energy) such as sunlight may be used.
Furthermore, a power generation device that generates electric power by thermal power generation using a temperature difference between a certain part and another part (thermal energy; corresponding to external energy) may be used.
In addition, it is also possible to adopt a configuration in which a stray electromagnetic wave such as a broadcast or communication radio wave is received and an electromagnetic induction type power generation device using the energy (corresponding to external energy) is used.

[5.12] Twelfth Modification In the above embodiment, the reference potential (GND) is set to Vdd (high potential side voltage), but the reference potential (GND) is set to Vss (low potential side voltage). Of course, it is good. In this case, the set voltage values V0 and Vgen indicate the potential difference from the detection level set on the high voltage side with respect to Vss.

[5.13] Thirteenth Modification In the above-described embodiment, a rechargeable power storage device such as a secondary battery or a capacitor that stores power generated by the power generation device is used as a power source. Further, a rechargeable power storage device and a primary battery may be used in combination, or a power generation device and a primary battery may be used in combination.

[5.14] Fourteenth Modification In the above description of the embodiment, the case of an analog electronic timepiece has been described, but the present invention is also applicable to an electronic device having a digital display device (digital display means) such as a liquid crystal panel. .
In this case, in the power saving mode, the power supply to the digital display device is stopped, and the display is not performed.
In a state where the display is not performed, it is possible to partially display the display so that the user does not apologize for the failure state. For example, only a display such as a mark that blinks about once every two to three seconds on the display screen may be performed.

It is a figure showing the schematic structure of the electronic timepiece concerning the embodiment of the present invention. FIG. 3 is a functional block diagram illustrating a control circuit according to the same embodiment and its peripheral configuration. It is the circuit diagram which actualized the electric power generation state detection part. 6 is an operation flowchart of the embodiment. FIG. 9 is a block diagram illustrating a configuration of a power supply peripheral portion according to a first modification. FIG. 11 is a block diagram illustrating a configuration of a power supply peripheral portion according to a second modification. It is a block diagram showing composition of a power supply peripheral part by a 3rd modification. FIG. 3 is a circuit diagram that embodies an oscillation circuit. 15 is a flowchart illustrating an operation according to a fourth modification. FIG. 2 is a schematic configuration diagram of a power generation detection circuit. FIG. 2 is a schematic configuration diagram of a voltage detection circuit. FIG. 2 is a schematic configuration diagram of a constant voltage generation circuit.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 ... Electronic timepiece 23 ... Control circuit 24 ... Drive control circuit 30S ... Second hand drive part 30HM ... Hour minute hand drive part 40 ... Power generation device 45 ... Rotating weight 48 ... High capacity secondary power supply (Large capacity capacitor)
49 booster circuit 90 mode setting section 91 power generation state detection section 93 central control circuit 94 mode storage section 95 set value switch 97 first detection circuit (energy amount determining means)
98 second detection circuit (power generation time determination means)
100: External input device 101: Power saving mode counter A: Power generation unit B: Power supply unit

Claims (1)

A chargeable power supply for supplying electrical energy,
A drive control unit that operates by electric energy supplied from the power supply unit and outputs a drive signal;
A driven part driven by receiving the driving signal;
A mode switching unit that switches an operation mode of the driven unit to a driving mode for performing normal driving and a power saving mode based on a first condition set in advance;
When the mode switching unit is in the power saving mode, the drive control unit is configured to determine whether the amount of electric energy stored in the power supply unit is smaller than a predetermined amount of electric energy. An operation stop unit for stopping the operation of
When the operation of the drive control unit is stopped by the operation stop unit, an operation start unit that starts the operation of the drive control unit when a preset third condition is satisfied;
An electronic device comprising:

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