JP2000292561A - Electronic equipment and method for controlling the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a voltage for program with a simple configuration. SOLUTION: A control circuit 16 controls a switch 13 so that a small-capacity capacitor 12 can be separated from a large-capacity capacitor 14 in a rewrite mode. When an AC voltage is induced at a coil 110 by external AC magnetic field, a charge current can be fed to only the small-capacity capacitor 12. As a result, the recharge voltage of the small-capacity capacitor 12 can be increased to a high voltage quickly, thus easily generating a voltage Vp for program without using any boosting circuits being composed of a charge pump and the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic device having a data rewritable storage unit, and more particularly to an electronic device suitable for generating a rewrite voltage required for data rewrite in an analog clock or a digital clock. The present invention relates to a device and a control method thereof.

[0002]

2. Description of the Related Art In a conventional analog electronic timepiece, the adjustment of the rate (the amount of time of the watch being different from the standard time; seconds / day) is performed by measuring the rate in a circuit block or movement state, and checking the result of the inspection. This is performed by writing adjustment data for adjusting the rate in the nonvolatile memory in response. In such analog electronic watches,
A battery having a terminal voltage of about 1.5 V is provided, and the battery voltage is used as a power supply voltage to supply power to a drive circuit of a drive motor that drives the hands and a time measurement circuit that measures time. By the way, the rewriting voltage required when rewriting data in the nonvolatile memory depends on the manufacturing process.
It is about 8V. Therefore, it is necessary to boost the power supply voltage in order to generate the rewrite voltage. FIG. 6 is a circuit diagram of a charge pump circuit used for boosting the power supply voltage. This charge pump circuit includes 20 N-channel transistors M1 to M20 and 20 capacitors. The first clock CLK1 is supplied to the odd-numbered capacitors C1, C3,..., And the second clock CLK2 is supplied to the even-numbered capacitors C2, C4,. Here, the first clock CLK1 and the second clock CLK2 are signals that do not overlap with each other. According to the above configuration, per stage (VDD−V
th), the voltage can be increased.

[0003]

However, as the number of boosting stages increases, the threshold voltage Vth of the N-channel transistor gradually increases due to the back gate effect, so that the boosting efficiency decreases as the number of stages increases. As a result, in order to increase the battery voltage of 1.5 V to generate a rewrite voltage of 18 V, 20 or more boosting stages are required. In order to incorporate such a charge pump circuit into an IC, it is necessary to form 20 or more capacitors on an IC chip. Therefore, the chip size becomes extremely large, and the manufacturing cost increases significantly. there were.

The present invention has been made in view of the above circumstances, and has as its object to provide an electronic device capable of generating a rewrite voltage with a simple circuit configuration and a control method thereof.

[0005]

According to the first aspect of the present invention, there is provided a rectifier for rectifying electric power induced in a coil and a power supply for storing a voltage obtained by storing the electric power. A first power storage member for supplying power to each part of the device as a voltage, storage means for storing data and requiring a rewrite voltage higher than the power supply voltage when rewriting data, and rewriting the voltage obtained by storing power to the rewrite. A second power storage member having a capacitance smaller than that of the first power storage member, and a power rectified by the rectifier being supplied to at least the first power storage member at the same time. A charge control unit that supplies the electric power rectified by the rectification unit only to the second power storage member at the time of data rewriting.

In this case, the second power storage member is connected to the rectification means, and the charge control means includes a switch provided between the first power storage member and the second power storage member, It is preferable to include a control unit that controls the switch unit to be turned on when the switch unit is turned on while the switch unit is turned off when the data is rewritten. Further, it is preferable that the coil is a motor coil of a drive motor that drives an object. Further, a voltage may be induced in the coil by an externally applied alternating magnetic field. Further, the coil may be a power generating coil of a generator that generates power by rotating a rotor by kinetic energy given from the outside. In this case, at normal time, the rotor is rotated by the kinetic energy given from the outside, and a voltage is induced in the power generating coil. On the other hand, at the time of data rewriting, a voltage is induced in the power generating coil by the externally applied AC magnetic field. Is preferred.

It is preferable that the rectifier has a plurality of switch elements, and rectifies the voltage of the coil while controlling the on / off of the switch elements to boost the chopper. Further, the rectifying means may also be used as a drive circuit for driving the drive motor.
In this case, it is preferable that the rectifier is a parasitic diode formed in a transistor that is bridge-connected to the motor coil.

[0008] The storage means may be non-volatile. Further, the electronic device may include a clock unit for measuring time, and a display unit for displaying the time measured by the clock unit.

Further, according to the invention described in claim 11, a data rewritable storage means, a first power storage member capable of storing power induced in a coil, and a first power storage member having a smaller capacitance than the first power storage member. A method for controlling an electronic device, comprising: a first power storage member and a second power storage member.
A power storage member is connected, the voltage induced in the coil is rectified, power is stored in the first power storage member and the second power storage member, and the stored voltage is supplied to each part of the device as a power supply voltage. Then, at the time of data rewriting, the first power storage member and the second power storage member are separated, the voltage induced in the coil is rectified, power is stored in the second power storage member, and the stored voltage is stored in the second power storage member. Powering the storage means as a rewrite voltage,
The data stored in the storage means is rewritten using the rewrite voltage.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a wristwatch-type analog electronic timepiece as an electronic device will be described as an example. However, the present invention is not limited to this. The present invention can be applied to any electronic device having a motor coil of a driving motor for use.

[1. First Embodiment] [1-1. Configuration of Analog Electronic Clock] First, the configuration of the analog electronic clock will be described. FIG. 1 shows a block diagram of an analog electronic timepiece. The analog electronic timepiece 10 includes a generator 100, a rectifier circuit 11, a small-capacity capacitor 12, a switch 13, and a large-capacity capacitor 14 as a power supply unit. In this example, the reference potential GND is set to VSS (low voltage side). However, the reference potential GND may be set to VDD (high voltage side).

As shown in FIG.
Includes a stator 112 on which a coil 110 is wound, and a disk-shaped rotor 114 magnetized with two poles.
When the user wearing the analog electronic timepiece 10 shakes his hand in the normal mode, the rotary weight 116 makes a turning motion, and the motion causes the wheel train mechanism 118 to rotate the rotor 114. Therefore, such a generator 10
0, the rotation of the rotary weight 116 causes the coil 110
AC power is generated between the terminals AG1 and AG2 located at both ends of. When the adjustment data in the nonvolatile memory 15 is rewritten as described later, a large-amplitude electromagnetic wave is transmitted from the external adjustment device. In this case, the rotating weight 116 does not rotate. Also, AC power is excited in coil 110 by electromagnetic induction.

Next, any circuit may be used for the rectifier circuit 11 as long as it rectifies the AC voltage excited by the coil 110, but it may be constituted by, for example, a diode bridge.

Next, the switch 13 is provided between the small capacity capacitor 12 and the large capacity capacitor 14,
In the case of a P-channel field effect transistor (FET), it is controlled to be turned on when an L level control signal CTL is supplied, and turned off when an H level control signal CTL is supplied. You. Therefore, depending on the logic level of the control signal CTL, the small capacitor 12
Can be connected in parallel with the large-capacity capacitor 14, or the small-capacity capacitor 12 can be separated from the large-capacity capacitor 14. In this example, the switch 13 is constituted by a P-channel field-effect transistor. However, it is needless to say that the switch 13 may be constituted by an N-channel field-effect transistor. In this case,
What is necessary is just to invert the polarity of the control signal CTL. In the following description, the voltage of the small-capacity capacitor 12 and the large-capacity capacitor 14 with respect to VSS in the connected state is referred to as the power supply voltage VDD1, and the voltage of the small-capacity capacitor 12 with respect to VSS in the separated state is referred to as the power supply voltage. Called VDD2.

In the present embodiment, the switch 13 is turned on in the normal mode in which the user uses the analog timepiece 10. As a result, the charging current obtained by the rectifier circuit 11 is charged in the small-capacity capacitor 12 and the large-capacity capacitor 14. On the other hand, in the rewrite mode in which data is rewritten in the nonvolatile memory 15, the switch 13 is turned off. As a result, the charging current flows only into the small capacity capacitor 12.

Incidentally, the capacitance value of the small-capacity capacitor 12 is set smaller than the capacitance value of the large-capacity capacitor 14. Therefore, in the rewrite mode, a high voltage is stored in the small-capacity capacitor 12 in a short time. The power supply voltage VDD2 at this time is supplied to the nonvolatile memory 15 as the program voltage Vp. On the other hand, in the normal mode, the charging current flows into the small-capacitance capacitor 12 and the large-capacity capacitor 14, so that the voltage of the large-capacity capacitor 14 rises slowly, but the amount of charge stored there is large. , The continuous operation time can be extended.

Further, the analog electronic timepiece 10 includes a nonvolatile memory 15, a control circuit 16, a drive circuit 17, and a display mechanism 18. First, the nonvolatile memory 15
It is composed of an EEPROM or a flash memory and stores adjustment data. The nonvolatile memory 15 operates only with the power supply voltage VDD of about 1.5 V when reading the adjustment data. However, when erasing the adjustment data or writing the adjustment data, the program voltage V of about 18 V is used.
requires p. Note that the adjustment data is data generated based on a result of measuring the rate of the analog electronic timepiece 10 in advance using an external adjustment device, and is used for adjusting the rate.

Next, the control circuit 16 controls the entire analog electronic timepiece 10 and has a time keeping function.
More specifically, a built-in oscillation frequency divider circuit that oscillates a reference oscillation signal using a crystal oscillator X and outputs a divided oscillation signal obtained by dividing the reference oscillation signal. Also,
The oscillation constant and the division ratio of the oscillation frequency dividing circuit are adjusted based on the adjustment data.

Next, the drive circuit 17 is configured to generate a drive pulse signal based on the divided oscillation signal. The display mechanism 18 used for time display includes a step motor driven by a drive pulse signal, a wheel train mechanism connected to the step motor, a pointer provided on a shaft of the wheel train, and the like. Next, the external operation means 19 is for inputting a user's operation instruction, and is composed of, for example, a switch and a crown. When the user operates the external operation means 19, a mode change instruction or the like is input.

[1-2. Operation of Analog Electronic Timepiece] Next, the operation of the present embodiment will be described. [1-2-1. Normal Mode] In the normal mode, since the adjustment data is not rewritten, the programming voltage V
There is no need to generate p. Therefore, the control circuit 16 sets the logic level of the control signal CTL to L level. In this case, the small capacitor 12 and the large capacitor 14 are connected.

In this state, the user operates the analog electronic timepiece 1
When 0 is worn on the wrist and the arm is shaken, the AC voltage of the coil 110 is rectified by the rectifier circuit 11, and the charging current flows into the small-capacity capacitor 12 and the large-capacity capacitor 14. As a result, the power supply voltage VDD1 increases, and the analog electronic timepiece 10 becomes operable. Thereafter, even if the user removes the analog electronic timepiece 10 from his / her wrist and places it on the desk, the small-capacity capacitor 12 and the large-capacity capacitor 14
, The analog electronic timepiece 10 continues to operate. Since the amount of charge stored in the large-capacity capacitor 14 is much larger than the amount of charge in the small-capacity capacitor 12, the continuous operation time can be sufficiently lengthened.

[1-2-1. Rewriting Mode] Next, the operation in the rewriting mode will be described. The transition from the normal operation mode to the rewrite mode is performed by a specific operation of the external input means such as a switch or a crown. In the rewriting mode, the analog electronic timepiece 10 is arranged close to the external adjustment device, and the coil 110 and the coil of the external adjustment device are electromagnetically coupled. FIG. 2 is a flowchart for explaining the operation of the analog electronic timepiece in the rewrite mode.

First, the control circuit 16 sets the logic level of the control signal CTL to H level. Then, the switch 13 is turned off, and the small capacitor 12 is disconnected from the large capacitor 14 (step S1). Thereby, the rectifier circuit 11 is connected to only the small-capacity capacitor 12.

Next, when the external adjusting device applies an external AC magnetic field having a large amplitude for a predetermined time (step S2), an induced voltage is excited in the coil 110 by the AC magnetic field.
The rectifier circuit 11 rectifies the induced voltage and supplies a charging current to the small capacitor 12. Here, the magnitude and duration of the external AC magnetic field are set so that the programming voltage Vp can be stored in the small-capacity capacitor 12 during the period. Since the capacitance of the small-capacity capacitor 12 is small, it is possible to store a high voltage in a short time.

Next, the control circuit 16 controls the small capacitor 1
The adjustment data stored in the non-volatile memory 15 is erased using the program voltage Vp stored in Step 2 (Step S3). As described above, the non-volatile memory 15 is EEP
Since it is constituted by a ROM, data can be erased and written by a tunnel current. Therefore, since a large current is not required at the time of data rewriting, data can be erased / written by the programming voltage Vp stored in the small capacitor 12 having a small capacitance value. next,
The control circuit 16 stores the new adjustment data in the nonvolatile memory 1.
5, and writes the adjustment data into the nonvolatile memory 15 using the program voltage Vp (step S4).

Thereafter, the operation may automatically return to the normal operation mode, or may return by operation of the external input means. Then, the control circuit 16 sets the logic level of the control signal CTL to L level, connects the small-capacity capacitor 12 and the large-capacity capacitor 14 via the switch 13, and ends the write mode (step S5).

[1-3. Effect of First Embodiment] (1) As described above, in the first embodiment, the switch 13 is controlled so as to disconnect the small-capacity capacitor 12 from the large-capacity capacitor 14 in the rewrite mode. When a voltage is induced, a charging current can flow only through the small-capacity capacitor 12. Therefore, the storage voltage of the small-capacity capacitor 12 can be increased to a high voltage in a short time, and the programming voltage Vp can be easily generated without using a booster circuit including a charge pump or the like. .

(2) Since an external magnetic field is applied to the coil 110 to generate the programming voltage Vp, the analog electronic timepiece 10 is provided with an input terminal for inputting the programming voltage Vp. There is no need to contact the power supply terminal to supply the programming voltage Vp, and the programming voltage Vp can be generated inside the analog electronic timepiece 10 in a non-contact state.

[2. Second Embodiment] An analog electronic timepiece according to a second embodiment is configured in the same manner as the analog electronic timepiece 10 according to the first embodiment, except that a chopper type step-up rectifier circuit 11 'is used as the rectifier circuit 11.

FIG. 3 is a circuit diagram of the chopper type step-up rectifier circuit 11 '. As shown in this figure, the chopper type boost rectifier circuit 11 ′ is configured as a bridge type full-wave rectifier circuit, and input terminals AG 1 and AG 2 are connected to a coil 110 of the generator 100. Therefore, the input terminal A
The generated voltage is supplied to G1 and AG2. Input terminal AG
1 and AG2 are connected to the high potential side power supply voltage VDD2 (VDD
1) are connected to the anodes of the diodes D1 and D2 to which the power is supplied, respectively. The input terminals AG1 and AG2 have N
Channel transistors N1A, N1B, N2A, N2
B are connected, and their drains are supplied with the low potential side power supply voltage VSS. In addition, the control circuit 1 is connected to the gates of the N-channel transistors N1A and N2A.
6, while the gate of the N-channel transistor N1B is connected to the input terminal AG2.
The gate of the N-channel transistor N2B is connected to the input terminal A.
G1.

In the above configuration, the input terminals AG1, A
When no electromotive voltage is generated during G2, the N-channel transistors N1B and N2B are off and N1A,
The N2A repeats on / off in the same phase according to the clock signal CLK. Here, an electromotive voltage is generated between the input terminals AG1 and AG2, and the voltage of the input terminal AG1 is positive, that is,
It is assumed that the voltage of the input terminal AG1> the input terminal AG2. In this case, when the potential of the input terminal AG1 becomes higher than the threshold voltage Vth of the N-channel transistor N2B, the N-channel transistor N2B is turned on. In this state, the voltage of the input terminal AG2 is fixed to the low potential side power supply voltage VSS irrespective of ON / OFF of the N-channel transistor N2A. Therefore, the gate voltage of the N-channel transistor N1B is fixed to the low potential side power supply voltage VSS, so that the N-channel transistor N1B is turned off. On the other hand, the N-channel transistor N1A repeatedly turns on and off according to the clock signal CLK. Conversely, when the voltage at the input terminal AG2 exceeds the voltage at the input terminal AG1, the N-channel transistor N1B is always on, while the N-channel transistor N2A is repeatedly turned on and off according to the clock signal CLK. Become.

Next, the operation of the chopper type step-up rectifier circuit 11 'will be specifically described with reference to FIG. FIG. 4 shows the relationship between the voltage waveform (based on VSS) induced at the input terminals AG1 and AG2 and the clock signal CLK. In this example, the voltage of the input terminal AG1 is
It is assumed that the voltage exceeds the voltage of G2. In this state, when the voltage of the input terminal AG1 exceeds the threshold voltage Vth of the N-channel transistor N2B, as described above, N
The channel transistor N2B is always on, while the N-channel transistor N1A receives the clock signal C
On / off is repeated according to LK.

That is, when the clock signal CLK is at the H level, the N-channel transistor N1A,
Since N2A is turned on at the same time, current flows through the path of the input terminal AG1, the N-channel transistor N1A, the N-channel transistor N2A, and the input terminal AG1, and power is accumulated in the coil 110.

Thereafter, when the clock signal CLK switches from the H level to the L level, the N-channel transistor N1A is turned off, so that the power stored in the coil 110 is discharged instantaneously. As a result, as shown in FIG. 4, in synchronization with the falling edge of the clock signal CLK,
The voltage waveform rises sharply and the chopper is boosted. Here, when the voltage of the input terminal AG1 exceeds the voltage obtained by adding the drop voltage of the diode D1 to the high potential side power supply voltage VDD2, the input terminal AG1 → diode D1 → small capacitance capacitor 12 → N-channel transistor N2B → input terminal AG2 A current flows through the path, and a charging current flows into the small-capacity capacitor 12.

The waveform shown by the dotted line in FIG. 4 is a voltage waveform when the chopper operation is not performed. Comparing this voltage waveform with the chopper-boosted voltage waveform shows that the chopper-boosted voltage waveform can obtain a higher voltage. Therefore, by using the chopper type step-up rectifier circuit 11 ', the voltage of the small capacity capacitor 12 can be further increased. As a result, it is possible to use the nonvolatile memory 15 that requires a higher programming voltage Vp. Conversely, the amplitude of the AC magnetic field transmitted from the external adjustment device can be reduced.

[3. Third Embodiment] [3-1. Configuration of Third Embodiment] In the first and second embodiments described above, the small-capacity capacitor 12 and the large-capacity capacitor 14 are charged with the AC power generated by using the generator 100 in the normal mode, while in the rewrite mode. The small-capacity capacitor 12 is separated, and the small-capacity capacitor 12 is charged using the AC power induced in the coil 110 of the generator 100. On the other hand, the third embodiment generates the programming voltage Vp using the voltage induced in the motor coil of the step motor.

FIG. 5 is a block diagram of an analog electronic timepiece according to the third embodiment. This analog electronic timepiece 10 'is different from the analog electronic timepiece 10 of the first embodiment (see FIG. 1) in that the rectifier circuit 11 is omitted and the drive circuit 17 is omitted.
The difference is that the driver control circuit 20 and the driver 30 are used more specifically, and the small-capacity capacitor 12 is connected to the high-potential power supply of the driver 30. Although the display mechanism 18 is omitted in FIG. 5, the coil 40 is a motor coil of a step motor which is a component of the display mechanism 18.

First, the driver control circuit 20 is configured to generate driver control signals φ1 to φ4 for controlling the driver 30 based on the divided oscillation signal supplied from the control circuit 16. Next, the driver 30
P-channel transistors 31 and 33 and N-channel transistors 32 and 34 are provided, and on / off operations are repeated based on driver control signals φ1 to φ4 supplied to their gates, and a drive pulse signal is applied to the coil 40. It is configured to be. These transistors are integrated in an IC chip, and when integrated, parasitic diodes 35 to 38 are formed. In such a configuration, when driving the motor, the P-channel transistor 31 is turned on when the driver control signal φ1 is at the L level, the N-channel transistor 34 is turned on when the driver control signal φ4 is at the H level, and the N-channel transistor is turned on. 32 or P-channel transistor 3
When any one of the switches 3 is turned off, a current flows through a path of the high-potential power supply voltage VDD2 → the P-channel transistor 31 → the coil 40 → the N-channel transistor 34 → the low-potential power supply voltage VSS, and the motor rotates.
Further, at the next drive timing, the driver control signal φ
2 is at the H level, the N-channel transistor 32 is turned on, the driver control signal φ3 is at the L level, the P-channel transistor 33 is turned on, and either the P-channel transistor 31 or the N-channel transistor 34 is turned off. Potential side power supply voltage VDD
A current flows through a path of 2 → P-channel transistor 33 → coil 40 → N-channel transistor 32 → low-potential-side power supply voltage VSS to rotate the motor.

[3-2. Operation of Third Embodiment] Next, the operation of the analog electronic timepiece 10 'according to the third embodiment will be described. The operation modes of the analog electronic timepiece 10 'include a rewriting mode for rewriting data, a charging mode for charging power, and a normal mode in which a user uses the analog electronic timepiece 10'.

[3-2-1. Rewriting Mode] First, in the rewriting mode, the analog electronic timepiece 10 'is arranged close to the external adjustment device, and the step motor coil 40 and the coil of the external adjustment device are electromagnetically coupled. In the rewrite mode, the control circuit 16 does not output the motor drive signal, which is the frequency-divided oscillation signal, to the driver control circuit 20. For this reason,
Driver control circuit 20 generates driver control signals φ1 to φ4 such that transistors 31 to 34 are always off. Therefore, in the rewrite mode, the driver 30 is equivalent to a diode bridge including the parasitic diodes 35 to 38. Next, the control circuit 16 sets the logic level of the control signal CTL to H level. Then, the switch 13 is turned off, and the small capacity capacitor 12 is disconnected from the large capacity capacitor 14.

Next, when the external adjusting device applies an external AC magnetic field having a large amplitude for a predetermined time, an induced voltage is excited in the coil 40 by the AC magnetic field. This induced voltage is rectified by a diode bridge composed of diodes 35 to 38, and a charging current flows into the small capacity capacitor 12. Since the capacitance value of the small capacitor 12 is small,
The power supply voltage VDD2 reaches the programming voltage Vp in a short time.

Next, the control circuit 16 controls the small capacitor 1
The adjustment data stored in the non-volatile memory 15 is erased and written using the program voltage Vp stored in 2. Thereafter, the control circuit 16 sets the logic level of the control signal CTL to L level, connects the small-capacity capacitor 12 and the large-capacity capacitor 14 via the switch 13,
End the write mode.

[3-2-2. Charge Mode] Next, in the charge mode, the analog electronic timepiece 10 ′ is set similarly to the rewrite mode.
Is disposed close to the external adjustment device, and the coil 40 of the step motor and the coil of the external adjustment device are electromagnetically coupled. Further, the control circuit 16 transmits the frequency-divided oscillation signal to the driver control circuit 2.
0, the driver 30 does not output the parasitic diodes 35 to 3
8 is similar to the rewrite mode. However, the difference from the rewrite mode is that the control circuit 16 sets the logic level of the control signal CTL to L level. That is, in the charging mode, the small-capacity capacitor 12 and the large-capacity capacitor 14 are connected via the switch 13.

In this state, when an external AC magnetic field is applied from the external adjustment device, the coil 40
The induced voltage is excited. This induced voltage is rectified by a diode bridge composed of diodes 35 to 38, and a charging current flows into the small capacity capacitor 12 and the large capacity capacitor 14. As a result, sufficient electric power for continuously operating the analog electronic timepiece 10 'is stored. More specifically, the external adjustment device used in the charging mode is a charging adapter used at home, and is also used as a table of the analog electronic timepiece 10 '. In this case, since charging is performed in a non-contact manner, there is no need to insert a charging jack, and the user only has to place the analog electronic timepiece 10 'on the table and operate the charging start button.

[3-2-3. Normal Mode] Next, in the normal mode, the control signal CTL is at the L level, the switch 13 is on, and the driver 30 is connected to the large-capacity capacitor 14. Therefore, driver 3
0 receives the power supply voltage VDD. The control circuit 16
Outputs a frequency-divided oscillation signal to the driver control circuit 20, and the driver 30 repeatedly turns on and off the transistors 31 to 34 based on the driver control signals φ1 to φ4, thereby driving the stepping motor.

[3-3. Effect of Third Embodiment] As described above, according to the third embodiment, the program voltage Vp can be generated using the motor coil of the step motor. In addition, since the rectification is performed using the parasitic diodes 35 to 38 associated with the transistors 31 to 34 constituting the driver 30, the driver 30 can be used also as a rectifier circuit for charging.

[4. Modifications] The present invention is not limited to the above-described embodiment, and various modifications described below are possible, for example. (1) In the above-described embodiment, the small-capacity capacitor 12 and the large-capacity capacitor 14 are connected / disconnected by controlling the switch 13. However, the present invention is not limited to this. Any configuration may be used as long as the power rectified by the rectifier 11 is supplied to at least the large-capacity capacitor 14 while the power rectified by the rectifier circuit 11 is supplied only to the small-capacity capacitor 12 during data rewriting.

(2) In the above-described embodiment, the voltage stored in the small-capacity capacitor 12 in the rewrite mode is used as the program voltage Vp.
Although the adjustment data in the nonvolatile memory 15 has been rewritten, the present invention is not limited to this, and the data is rewritten using a boosted voltage obtained by further boosting the voltage of the small-capacity capacitor 12 by a booster circuit. It may be. In this case, a higher voltage can be generated.

(3) In the above-described embodiment, the control circuit 16 detects the power supply voltage VDD2, and when the detected voltage exceeds a predetermined voltage, a limiter circuit is provided to prevent destruction of circuit elements due to overvoltage. You may. Specifically, the rectifier circuits 11, 11 'and the driver 30 may be controlled so as to stop the charging operation of the small-capacity capacitor 12. When controlling the rectifier circuit 11 ′, the clock signal CLK may be kept at the H level at all times.
0, the N-channel transistor 32
And 34 are turned off and the P-channel transistors 31 and 33 are turned on.

(4) In the above-described embodiment, the generator 100 has been described as an example of the power generation mechanism. However, the present invention is not limited to this, and the power generation unit generates electric power by converting external energy into electric energy. Anything can be applied. For example, the piezoelectric effect can be obtained by generating a rotating motion by a spring restoring force (corresponding to external energy) and generating an electromotive force by the rotating motion, or by applying external or self-excited vibration or displacement to the piezoelectric body. A power generating device that generates electric power by the power generation may be used. Furthermore, a power generation device (solar cell) that generates electric power by photoelectric conversion using light energy such as sunlight may be used. Furthermore, a power generation device that generates electric power by thermal power generation based on a temperature difference between a certain part and another part (thermal energy; corresponding to external energy) may be used. Further, it is also possible to adopt a configuration in which a floating 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. It is also possible to adopt a configuration using a plurality of different power generation devices.

(5) In the above embodiment, the analog electronic timepieces 10 and 10 'have been described as an example. However, the present invention is not limited to this, and may be a digital timepiece or a pocket watch. Further, the present invention can be applied to various electronic devices such as an electric toothbrush, an electric shaving machine, a calculator, a mobile phone, a portable personal computer, an electronic organizer, a portable radio, and a portable VTR.

(6) In the above embodiment, the adjustment data is stored in the non-volatile memory 15.
You may make it memorize | store the various adjustment data of a number, a sensor, and a detection circuit. In addition to the data writing, not only the data writing during the adjustment process in the factory, but also the data writing at the store front or after-sales service is possible.

[0053]

According to the present invention, power is stored in the first and second power storage members during normal operation, while power is stored in the second power storage member during data rewriting. Therefore, a high rewrite voltage can be easily generated. can do. In addition, a rewrite voltage can be generated in a non-contact manner by inducing a voltage in the coil with an AC magnetic field from the outside.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration of an analog electronic timepiece according to a first embodiment of the invention.

FIG. 2 is a flowchart for explaining the operation of the embodiment.

FIG. 3 is a block diagram illustrating a configuration of an analog electronic timepiece according to a second embodiment.

FIG. 4 is a waveform chart for explaining the operation of the embodiment.

FIG. 5 is a block diagram illustrating a configuration of an analog electronic timepiece according to a third embodiment.

FIG. 6 is a circuit diagram of a charge pump circuit used for boosting a power supply voltage.

[Explanation of symbols]

10, 10 '... analog electronic timepiece 11, 11' ... rectifier circuit 12 ... small-capacity capacitor (second power storage member) 13 ... switch (switch section, charge control means) 14 ... large-capacity capacitor (first Power storage member 15 Non-volatile memory (storage means) 16 Control circuit (charging control means) 31, 33 P-channel transistor (transistor) 32, 34 N-channel transistor (transistor) 35-38 Parasitic diode 40, 110 Coil Vp Program voltage

Continued on the front page F-term (reference) 2F002 AA04 AB04 AC01 AE01 BB02 BB04 2F084 BB01 BB09 CC03 CC04 GG02 JJ05 JJ07 JJ10

Claims (12)

[Claims] 1. A rectifier for rectifying power induced in a coil, a first power storage member for supplying a voltage obtained by storing power as a power supply voltage to each part of the device, storing data, At the time of rewriting, a storage means that requires a rewriting voltage higher than the power supply voltage, and a voltage obtained by storing power is supplied to the storage means as the rewriting voltage, and the capacitance is smaller than the first power storage member A second power storage member, and normally supplies the power rectified by the rectification means to at least the first power storage member, and rewrites the power rectified by the rectification means at the time of data rewriting to the second power storage member.
An electronic device, comprising: charge control means for supplying only to a power storage member. 2. The second power storage member is connected to the rectification means. The charge control means includes a switch provided between the first power storage member and the second power storage member. The electronic device according to claim 1, further comprising: a control unit configured to control the switch unit to be turned off while the data is rewritten while the switch unit is turned on. 3. The motor according to claim 1, wherein the coil is a motor coil of a drive motor for driving an object.
Or the electronic device according to 2. 4. A voltage is induced in the coil by an externally applied alternating magnetic field.
The electronic device according to any one of Items 1 to 3. 5. The power generating coil according to claim 1, wherein the coil is a power generating coil of a generator that generates power by rotating a rotor by kinetic energy given from the outside.
An electronic device according to claim 1. 6. Normally, a rotor is rotated by externally applied kinetic energy to induce a voltage in the power generation coil, while a voltage is induced in the power generation coil by an externally applied AC magnetic field during data rewriting. The electronic device according to claim 5, wherein 7. The rectifier includes a plurality of switch elements, and rectifies the voltage of the coil while controlling the on / off of the switch elements to boost the chopper. The electronic device according to any one of Items 1 to 6. 8. The electronic device according to claim 3, wherein the rectifying unit is also used as a drive circuit that drives the drive motor. 9. The electronic device according to claim 7, wherein the rectifier is a parasitic diode formed in a transistor that is bridge-connected to the motor coil. 10. The electronic apparatus according to claim 1, wherein the storage unit is non-volatile. 11. The apparatus according to claim 1, further comprising: a time measuring means for measuring a time; and a display means for displaying the time measured by the time measuring means.
Electronic equipment according to the item. 12. A method for controlling an electronic device, comprising: a storage unit capable of rewriting data; a first power storage member capable of storing power induced in a coil; and a second power storage member having a smaller capacitance than the first power storage member. In normal times, the first power storage member and the second power storage member are connected, and the voltage induced in the coil is rectified to store power in the first power storage member and the second power storage member. Then, the stored voltage is supplied to each part of the device as a power supply voltage, and at the time of data rewriting, the first power storage member and the second power storage member are separated, and the voltage induced in the coil is rectified, An electronic device, comprising: storing power in the second power storage member, supplying the stored voltage as a rewrite voltage to the storage unit, and rewriting data stored in the storage unit using the rewrite voltage. Control method.