JP2009011137A - Driving device and driving device for clock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device and a driving device for clock, in which the power consumption is reduced, and even when the power voltage drops, a predetermined rotating motion can be obtained. <P>SOLUTION: Since redundant drive current flowing through an electric motor 2 is charged to a capacitance element C1 and reused, by the capacitance element C1 connected to one terminal of the electric motor 2, the power consumption of the electric motor 2 can be reduced. Moreover, the voltage boosted by the voltage Vc of the capacitance element C1 rather than a supply voltage Ve in a charge pump form, can be applied to the electric motor 2, by charging to the capacitance element C1, and switching the connection of power terminals TA, TB by switches SW1-SW4. Even when the supply voltage drops, the rotary drive of the electric motor 2 can be continued, and the battery lifetime until the electric motor 2 stops can be extended. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a driving device having a motor and a timepiece driving device that drives a timepiece hand by the motor.

  Conventionally, a stepping motor for a timepiece is used to drive the hands of the timepiece. A stepping motor for a watch uses, for example, a permanent magnet that is magnetized to two poles, and a stator that can be magnetized to two poles is disposed so as to surround four sides of the rotor. By alternately supplying different drive pulses, the rotor is rotated 180 degrees in the same direction. With such a configuration, a motor with a simple structure and low power consumption can be realized.

In addition, as a conventional technique related to the present invention, the following technique has been disclosed. For example, Patent Document 1 discloses a technique for recovering and reusing motor regenerative power with a capacitor, and Patent Document 2 discloses magnetic energy at the time of current interruption for power factor improvement of a power supply circuit. A technique for regenerating and supplying to an inductive load is disclosed.
JP 2006-230068 A Japanese Patent No. 3735673

  In the stepping motor as described above, if power is uniformly supplied without any ingenuity to drive the rotation, there is a problem that wasteful power consumption occurs and the battery life is shortened when the battery is driven. Arise.

  In addition, since the stepping motor as described above has a property that a driving force for one step cannot be obtained when the driving voltage decreases, the regenerative power of the motor is simply reused as in the technique of Patent Document 1. If only the battery voltage is lowered, there arises a problem that the rotational movement cannot be continued.

  An object of the present invention is to provide a driving device and a timepiece driving device capable of reducing power consumption and obtaining a predetermined rotational motion even when a power supply voltage is lowered.

In order to solve the above problem, the invention according to claim 1
A motor that rotationally drives by alternately supplying drive pulses of different polarities;
A first power supply terminal and a second power supply terminal to which DC power is supplied;
A capacitive element connected in series to the first terminal side of the motor;
Switch means capable of alternately switching the connection on the second terminal side of the motor and the connection on the terminal side opposite to the motor of the capacitive element to the first power supply terminal and the second power supply terminal;
Control means for controlling the operation of the switch means so that drive pulses having different polarities are alternately applied to the motor by the DC power supply;
It is provided with the following.

The invention according to claim 2 is the drive device according to claim 1,
The switch means includes
A first switch for connecting / disconnecting a terminal opposite to the motor of the capacitive element and the first power supply terminal;
A second switch for connecting / disconnecting a terminal opposite to the motor of the capacitor and the second power supply terminal;
A third switch for connecting / disconnecting the second terminal of the motor and the first power supply terminal;
A fourth switch for connecting / disconnecting the second terminal of the motor and the second power supply terminal;
It is characterized by comprising.

According to a third aspect of the present invention, in the drive device according to the first or second aspect,
Voltage detecting means for detecting the voltage of the DC power supply,
The control means includes
When the voltage of the DC power supply is lowered based on the detection of the voltage detection means, the switch means is operated so that a period for supplying a drive pulse to the motor becomes longer.

According to a fourth aspect of the present invention, in the driving device according to the first or second aspect,
Current detection means for detecting a current flowing through the second power supply terminal;
The control means includes
When the amount of current flowing through the second power supply terminal is reduced based on the detection by the current detection means, the switch means is operated so that a period for supplying a drive pulse to the motor becomes longer.

The invention according to claim 5 is the drive device according to any one of claims 1 to 4,
The first power supply terminal and the second power supply terminal are connected to an anode and a cathode of a battery and supplied with the DC power.

The invention described in claim 6
A drive device according to any one of claims 1 to 5, comprising:
A timepiece drive device characterized in that the timepiece hands are moved by rotation of the motor.

  According to the present invention, since the drive current is charged by the capacitive element, an effect of reducing the extra power consumption generated in the motor can be obtained. Further, the voltage of the drive pulse applied to the motor in the form of a charge pump can be boosted by charging the capacitor element and switching the connection of the power supply terminal by the switch means. As a result, even when the power supply voltage is lowered, the effect that the rotation of the motor can be continued is obtained. In addition, for example, when the motor is driven by a battery, the effect that the battery life can be extended is obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a block diagram showing a timepiece drive device according to a first embodiment of the present invention.

  The timepiece drive device 1 of this embodiment is a drive device for driving a timepiece hand, a motor 2 whose drive shaft is connected to a gear or the like that moves the hands, a battery 5 that supplies DC power, A smoothing capacitor C2 that smoothes the power supply voltage and removes noise, a capacitor C1 that is a capacitive element connected in series to the first terminal side of the motor 2, a circuit portion of the motor 2 and the capacitor C1, and power supply terminals TA and TB And a plurality of switches SW1 to SW4 that can be switched alternately, and a control unit 10 that performs switching control of these switches SW1 to SW4.

  The control unit 10 includes a CPU (central processing circuit) 11 that executes a control program, a RAM (Random Access Memory) 12 that provides a working memory space for the CPU 11, and an analog voltage value that is digitally captured. A converter 13, a ROM (Read Only Memory) 14 storing control data and a control program, and the like are provided. The control program includes, for example, a pulse width correction process program that changes the pulse width of the drive pulse to the motor 2 based on a decrease in the battery voltage Ve.

  For example, the switches SW1 to SW4 are constituted by semiconductor switches such as MOSFETs, but various other switches may be applied. The switches SW1 to SW4 include a first power supply terminal TA to which the anode of the battery 5 is connected, a second power supply terminal TB to which the cathode of the battery 5 is connected, and one terminal (capacitor C1 is connected to the motor 2). The terminal on the side not connected) and the terminal on the one end side of the capacitor C1 (the side opposite to the motor connection side) can be switched alternately. Specifically, the first switch SW1 turns on / off the connection between the first power supply terminal TA and the terminal on one end side (the side opposite to the motor connection side) of the capacitor C1, and the second switch SW2 is the second switch SW2. A switch for turning on / off the connection between the power supply terminal TB and one terminal of the capacitor C1, and a third switch SW3 for turning on / off the connection between the first power supply terminal TA and one terminal TD of the motor 2. The 4 switch SW4 turns on / off the connection between the second power supply terminal TB and one terminal TD of the motor 2. With such a switch configuration, reliable switching can be performed with simple control.

  The capacitor C1 is, for example, a ceramic capacitor or various solid capacitors, and has a capacity that charges the drive current for one step of the motor 2 and increases the voltage Vc at both ends thereof to a level that can be compared with the battery voltage Ve. It is. If such a capacitance can be realized, the gate capacitance of the MOSFET may be used or various capacitance elements may be applied.

  FIG. 2 is a plan view showing a specific structure of the motor 2.

  The motor 2 is a stepping motor in which the rotor 21 rotates by one step by alternately supplying drive pulses having different polarities between the first terminal TC and the second terminal TD. Although not particularly limited, a permanent magnet magnetized in two poles is used for the rotor 21, and stators 22 a and 22 b are provided so as to surround the rotor 21. Stator 22a, 22b is divided | segmented into right and left on both sides of the rotor 21, and the two surfaces facing the rotor 21 are magnetized by the north-pole and the south pole when an electric current is sent through the coil 23. FIG. With such a configuration, when a positive drive pulse is applied to the coil 23 and a current of a predetermined amount or more flows in the forward direction, the rotor 21 rotates and stops 180 degrees, and then a negative positive drive pulse is generated. The rotor 21 rotates 180 degrees in the same direction and stops when a predetermined amount of current flows in the opposite direction when applied. Then, by repeating such an operation, the rotor 21 rotates in the same direction by 180 degrees.

  FIG. 3 is a time chart for explaining the operation of the switches SW1 to SW4, and FIGS. 4 and 5 are diagrams for explaining the current flow when the motor rotates.

  In this embodiment, a control example is shown in which the motor 2 is rotated half a turn every second. In this case, as shown in FIG. 3, the operations of the switches SW <b> 1 to SW <b> 4 are controlled so that drive pulses having different polarities are supplied to the motor 2 every second.

  That is, first, in the first phase period t1 in which the motor 2 is rotated halfway, the fourth switch SW4 is turned on, and the cathode-side power supply terminal TB is connected to the second terminal TD side of the motor 2. Further, the second and third switches SW2 and SW3 are kept off throughout the first phase period t1. Further, the first switch SW1 is turned on for a predetermined period from the start of the first phase period, and this becomes the drive pulse PLS1 supplied to the motor 2. That is, as shown in FIG. 4A, when the first switch SW1 is turned on, a current is supplied from the anode-side power supply terminal TA to the motor 2 via the capacitor C1, thereby causing the motor 2 to make a half rotation. .

  Further, the capacitor C1 is charged by this current, and as shown in FIG. 4B, the first switch SW1 is turned off in this state, whereby the charge voltage Vc is held between both terminals of the capacitor C1. The charge voltage Vc is approximately equal to the battery voltage Ve by appropriately setting the capacitance of the capacitor C1 and the pulse width of the drive pulse.

  Next, in the second phase period t2, the second switch SW2 is turned on, and the power supply terminal TB on the cathode side is connected to the first terminal TC side of the motor 2 via the capacitor C1. Further, the first and fourth switches SW1 and SW4 are kept off throughout the second phase period t2. Further, the third switch SW3 is turned on for a predetermined period from the start of the second phase period, and this becomes the drive pulse PLS2 supplied to the motor 2. As shown in FIG. 4C, when the third switch SW3 is turned on, the anode-side power supply terminal TA is connected to the second terminal TD of the motor 2, but at this time, between both terminals of the capacitor C1. Since the charge voltage Vc is generated, a voltage (Ve + Vc) obtained by adding the battery voltage Ve and the charge voltage Vc of the capacitor C1 is added between both terminals TD and TC of the motor 2 at the start of the drive pulse PLS2. Applied. And an electric current is sent by the motor 2 by these and the motor 2 carries out a half rotation.

  Further, as shown in FIGS. 4D and 5A, the capacitor C1 is charged in the reverse direction by the current at this time, and as shown in FIG. 5B, the third switch SW3 is in this state. When turned off, the reverse charge voltage Vc is held between both terminals of the capacitor C1. In the next phase period, the same operation as in the first phase period t1 described above is performed, and charging / discharging of the capacitor C1 and rotation of the motor 2 are performed. Although omitted in the description of FIG. 4A, as shown in FIGS. 5B to 5D, immediately before the first switch SW1 is turned on, a charge voltage is applied between both terminals of the capacitor C1. Since Vc is generated, a voltage (Ve + Vc) obtained by adding the battery voltage Ve and the charge voltage Vc of the capacitor C1 is applied between the terminals TC and TD of the motor 2 at the start of the drive pulse PLS1. A current flows.

  Next, the operation of the capacitor C1 will be described.

  FIG. 6 is a waveform diagram showing the drive current flowing in the motor 2 when the capacitor C1 is connected and when it is not connected.

  As shown by the solid line current waveform in FIG. 6, when a drive pulse is supplied to the motor 2 without connecting the capacitor C1, the drive current rises once while the motor 2 rotates by one step, and then the motor 2 ( The current drops due to the counter electromotive force accompanying the rotation of the rotor 21). However, since the drive pulse is maintained at a high level for a while after that, the current flowing in the coil 23 of the motor 2 rises again during this time, and then the current stops at the end of the drive pulse.

  On the other hand, as shown in the current waveform of the one-dot chain line in FIG. 6, by connecting a capacitor C1 having an appropriate capacity in series with the motor 2, a driving current similar to the above flows when the motor 2 rotates by one step, Even if the pulse is maintained at a high level, the charge voltage of the capacitor C1 is increased, so that an excessive current flowing in the motor 2 can be reduced. Therefore, extra power consumption as shown by the hatched portion in FIG. 6 can be reduced.

  In addition, as the capacity of the capacitor C1 increases, the effect of reducing the power consumption is reduced. Conversely, if the capacity of the capacitor C1 is too small, a driving current for rotating the motor 2 cannot be supplied. Therefore, from the viewpoint of reducing the power consumption, the capacitance of the capacitor C1 is preferably selected to be a small value within a range in which the rotation drive for one step of the motor 2 can occur.

  FIG. 7 is a waveform diagram showing the relationship between the drive voltage and drive current of the motor 2 in a simplified manner.

  Further, as described above, the capacitor C1 has the effect of pushing up the voltage applied to the motor 2 at the start of the drive pulses PLS1 and PLS2 to about twice the battery voltage Ve in the form of a charge pump.

As shown in FIG. 7, when the internal circuit of the motor 2 is represented by a simple model, when the drive voltage Vm is applied to the motor 2, the drive current Im flowing through the motor 2 increases with a gradient corresponding to the voltage value. I will do it. Therefore, as shown in FIGS. 7A-1 and 7B-1, when the voltage Vm applied to the motor 2 is low, the current I ₀ required to rotate the motor 2 is obtained. The drive pulse needs to be long. On the other hand, FIG. 7 (b-1), ( b-2) as shown, when the voltage Vm applied to the motor 2 is high, the driving pulses to obtain a current I ₀ required to rotate the motor 2 Can be shortened.

  Due to such characteristics, the drive voltage applied to the motor 2 is pushed up by the capacitor C1, so that the pulse width of the drive pulse required to drive the motor 2 by one step can be shortened. Actually, the motor 2 has a resistance component, a counter electromotive force is generated due to the rotation of the rotor 21, and the driving voltage is lowered as the discharge of the capacitor C1 proceeds. Although the drive voltage and the drive current do not have simple waveforms as shown in FIG. 7, the rotational voltage of the rotor 21 can be smoothly started by increasing the drive voltage particularly in the initial stage of generating the rotational motion of the rotor 21. Therefore, the pulse width of the drive pulse can be shortened in order to obtain a half-rotation drive of the motor 2.

  On the other hand, when the battery voltage Ve decreases, a situation may occur in which the resistance component of the motor 2 wins and a driving current necessary for rotation cannot be obtained even if the driving pulse is lengthened. However, in the driving apparatus 1 of this embodiment, the capacitor C1 pushes up the driving voltage, so that the normal voltage can be supplied to the motor 2 even if the battery voltage Ve drops to half of the normal voltage. Become. Thereby, it is possible to continue the rotational drive of the motor 2 even when the battery voltage Ve is lower than when the capacitor C1 is not connected.

  Note that when the battery voltage Ve decreases, the speed at which charges are accumulated in the capacitor C1 decreases. Therefore, it is necessary to increase the drive pulse to ensure the charging time for the capacitor C1. The effect of compensating for the decrease in the battery voltage Ve is reduced when the capacity of the capacitor C1 is small, so that the period for boosting the voltage is shortened. When the capacity of the capacitor C1 is increased, the period for boosting the voltage is increased. However, if the capacity is excessively increased, the effect of reducing the power consumption shown in the explanation of FIG. 6 is reduced. Therefore, the capacity of the capacitor C1 may be selected appropriately in consideration of both.

  FIG. 8 shows a flowchart of the pulse width correction process executed by the CPU 11.

  This pulse width correction process is a process repeatedly executed by the CPU 11 of the control unit 10 at predetermined intervals, for example. When this process is started, the CPU 11 first detects the battery voltage Ve via the AD converter 13 (step J1), and then performs a branching process according to the battery voltage Ve (step J2). That is, by comparing the actual battery voltage Ve with the first threshold voltage Vth1 set to be slightly lower and the second threshold voltage Vth2 set to be lower, the battery voltage Ve is greater than the first threshold voltage Vth1. If the battery voltage Ve becomes lower than the first threshold voltage Vth1, the pulse width is doubled, and if the battery voltage Ve is further lower than the second threshold voltage Vth2, the pulse width is set to four times. (Steps J3 to J5). Then, one correction process is completed.

  As a result of such compensation processing, as shown by the dotted line in the time chart of the first switch SW1 and the third switch SW3 in FIG. When the PLS2 pulse width is changed and the battery voltage Ve decreases, the charging time of the capacitor C1 becomes longer. As a result, even when the battery voltage Ve is such that the rotation of the motor 2 is stopped in the conventional drive device, the drive voltage is increased by the capacitor C1 and the rotation of the motor 2 can be continued.

  Such an action is particularly effective for a driving device using a small stepping motor that drives a watch hand using a battery as a power source.

  Note that the change in the pulse width of the drive pulses PLS1 and PLS2 in accordance with the battery voltage Ve is not limited to a change in a plurality of stages as described above. For example, the pulse width of the drive pulse continuously changes in accordance with the battery voltage Ve. It is good also as such control. As a result, the power consumption can be reduced more finely.

[Second Embodiment]
FIG. 9 is a block diagram showing a timepiece drive device according to the second embodiment of the present invention.

  The timepiece drive device 1B of this embodiment is configured to monitor the amount of current flowing through the motor 2 in order to detect a decrease in the battery voltage Ve or to set the drive pulse to an optimum pulse width. Other configurations such as the motor 2 and the switches SW1 to SW4 are the same as those in the first embodiment.

  The timepiece drive device 1B of this embodiment is provided with a current detection resistor R1 and an amplifier 7 for amplifying the detection voltage generated by the resistor R1 in order to detect the drive current of the motor 2. . The current detection resistor R1 is connected between the connection node n1 of the second switches SW2 and SW4 and the power supply terminal TB, and converts the current flowing through the motor 2 into a voltage. The amplifier 7 has an input terminal connected to the connection node n1 and outputs a detection voltage to the AD converter 13.

  FIG. 10 shows a flowchart of the pulse width correction process executed in the second embodiment.

  In the control unit 10, for example, the pulse width compensation process of FIG. 10 is started every predetermined period. When this process is started, the CPU 11 detects the peak value Ip of the drive current flowing through the motor 2 based on the input of the AD converter 13 (step J11). The first peak value Ip is set with a margin to rotate the motor 2 so that the current amount required for the rotation of the motor 2 is not less than or not unnecessarily large. Control is performed so as to widen the pulse width of the drive pulse when the threshold value is below, or to narrow the pulse width of the drive pulse when it exceeds the second threshold value set as an unnecessarily large current amount (step J12).

  According to such control, as shown in the time chart of the first switch SW1 and the third switch SW3 in FIG. 3, the ON period of the first switch SW1 and the third switch SW3 (pulse widths of the drive pulses PLS1 and PLS2). Are appropriately changed. When the battery voltage Ve is high, the pulse widths of the drive pulses PLS1 and PLS2 are narrowed to reduce power consumption. When the battery voltage Ve is lowered, the pulse widths of the drive pulses PLS1 and PLS2 are widened. Thus, the boosting action of the drive voltage by the capacitor C1 is increased. As a result, an effect of reducing power consumption and an effect of boosting the drive voltage when the battery voltage Ve decreases can be obtained, and the battery life can be greatly extended.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, when it is detected by the above-described current monitoring that the rotational motion for one step of the motor 2 has not been obtained, a correction process (for example, half a rotation for one second) is performed to compensate for the missing rotation. It is also possible to perform correction processing such as twice.

  In the first and second embodiments, the DC power is supplied directly from the battery 5 to the motor 2. However, the DC power may be supplied via a power circuit such as a regulator circuit. good. Further, the motor is not limited to a form that rotates half a step, and the control content is not limited to the control that rotates one step every second. In addition, although a driving device that drives a watch hand is shown, the present invention is not limited to this, and the present invention may be applied to a driving device that drives various devices.

  In addition, the details specifically shown in the first and second embodiments can be appropriately changed without departing from the spirit of the invention.

[Third Embodiment]
FIG. 11 is a block diagram showing a schematic configuration of a motor drive device 100 according to a third embodiment to which the present invention is applied.
In FIG. 11, the motor driving device 100 according to the third embodiment accumulates electric charges in a capacitor C <b> 11, and drives the motor M by adding the accumulated electric charges to the power supply voltage supplied from the power supply 102.
The motor driving device 100 is mounted on an electronic device such as a wristwatch and drives a DC motor M such as a stepping motor that rotates an hour hand, a minute hand, a second hand, and the like. Specifically, as shown in FIG. 11, the motor drive device 100 includes a motor drive circuit 101, a power source 102, a control unit 103, and the like.

  The motor drive circuit 101 includes a motor M, first and second capacitors C11 and C12, first to eighth switches SW11 to SW18, first and second diodes D11 and D12, and the like.

  The motor M drives the rotor stepwise by a predetermined angle (for example, 180 °) based on application of a pulse. The motor M includes a first terminal m11 connected to the fourth switch SW14, the sixth switch SW16, and the second diode D12, a third switch SW13, a fifth switch SW15, and a first diode. And a second terminal m12 connected to D11.

  The power supply 102 generates a voltage having a predetermined magnitude and supplies it as a power supply voltage for driving the motor driving apparatus 100.

The first and second capacitors C11 and C12 are provided between the power supply 102 and the motor M.
The first capacitor C11 is an accumulator that accumulates electric charges supplied from the power supply 102. Further, the first capacitor C11 forms a resonance circuit with the inductance of the coil of the motor M, and can reduce electric power that does not contribute to the rotation operation of the motor M (see FIGS. 15 and 16).

The first to eighth switches SW11 to SW18 are composed of field effect transistors or the like. In addition, the first to eighth switches SW11 to SW18 are connected to the control unit 103 via signal lines, and are turned on or off under the control of the control unit 103, thereby connecting circuit wiring. Is to be switched.
Specifically, under the control of the control unit 103, the first switch SW11, the fourth switch SW14, and the fifth switch SW15 are turned on, and the second switch SW12, the third switch SW13, and the second switch SW15 are turned on. When the switch SW16 of FIG. 6 is turned off, the current flows in the direction as indicated by the one-dot chain line arrow, while the second switch SW12, the third switch SW13, and the sixth switch SW16 are turned on. When the first switch SW11, the fourth switch SW14, and the fifth switch SW15 are turned off, a current flows in a direction as indicated by a two-dot chain line arrow.

The first diode D11 is connected between the first capacitor C11 and the motor M in parallel with the third switch SW13. The second diode D12 is connected between the first capacitor C11 and the motor M in parallel with the fourth switch SW14.
The first and second diodes D11 and D12 regenerate the back electromotive force generated by the rotation of the motor M in the first capacitor C11 as regeneration means.

The seventh switch SW17 is connected between the first diode D11 and the first capacitor C11. The eighth switch SW18 is connected between the second diode D12 and the first capacitor C11.
The seventh and eighth switches SW17 and SW18 function as a regenerative connection switching unit, and turn off the connection between the first and second diodes D11 and D12 and the first capacitor C11 when the back electromotive force is regenerated. It switches from the state to the ON state. That is, the seventh switch SW17 switches the negative back electromotive force generated from the motor M to the first state by switching from the OFF state to the ON state at the moment when the third switch SW13 is switched from the ON state to the OFF state. The first capacitor C11 is regenerated through the diode D11. Further, the eighth switch SW18 switches the negative back electromotive force generated from the motor M to the second state by switching from the OFF state to the ON state at the moment when the fourth switch SW14 is switched from the ON state to the OFF state. The first capacitor C11 is regenerated through the diode D12.

  The control unit 103 includes a CPU 131, a RAM 132, a ROM 133, and the like, and controls driving of each unit of the motor driving device 100.

The control unit 103, together with the first to sixth switches SW11 to SW16, constitutes a first switching control unit. That is, the CPU 131 of the control unit 103 performs the first terminal of one of the two terminals of the first capacitor C11 and the motor M based on the execution of the first switching control program 133a stored in the ROM 133. (Right terminal) m11 is connected to drive the motor M and store the charge in the first capacitor C11, and then connect the terminal connected to the first capacitor C11 of the motor M to the second terminal. A first switching control step for switching to (left terminal) m12 is performed.
Specifically, based on the execution of the first switching control program 133a, the CPU 131 of the control unit 103 turns on the first switch SW11, turns off the second switch SW12, and sets the fourth switch SW11. The switch SW14 is turned on, the third switch SW13 is turned off, the fifth switch SW15 is turned on, the sixth switch SW16 is turned off, and the motor M is driven to rotate approximately 180 °. After that, the first switch SW11 is turned off and the second switch SW12 is turned on. The fourth switch SW14 is turned off and the third switch SW13 is turned on. 5 switch SW15 is turned off and the sixth switch SW16 is turned on. It performs switching control that.

The control unit 103 constitutes a second switching control unit together with the first to sixth switches SW11 to SW16. That is, the CPU 131 of the control unit 103 transfers the electric charge stored in the first capacitor C11 from the power source 102 after the first switching control step based on the execution of the second switching control program 133b stored in the ROM 133. First, the motor M is driven by being added to the supplied power supply voltage, and after the electric charge is accumulated in the first capacitor C11, the terminal connected to the first capacitor C11 of the motor M is switched to the first terminal. And the electric charge stored in the first capacitor C11 by the first operation is added to the power supply voltage supplied from the power supply 102 to drive the motor M, and the electric charge is accumulated in the first capacitor C11. Then, the second operation of switching the terminal connected to the first capacitor C11 of the motor M to the second terminal is approximately 180 ° of the motor M. And it performs the second switching control step of switching control alternately every rotation angle) that is determined in advance.
Specifically, after the first switching control step, the CPU 131 of the control unit 103 turns on the first switch SW11 and the second switch SW12 based on the execution of the second switching control program 133b. Is turned OFF, the fourth switch SW14 is turned ON, the third switch SW13 is turned OFF, the fifth switch SW15 is turned ON, and the sixth switch SW16 is turned OFF. The first operation of switching the terminal connected to the first capacitor C11 of the motor M to the first terminal, the first switch SW11 being turned off and the second switch SW12 being turned on; and The fourth switch SW14 is turned off, the third switch SW13 is turned on, and the fifth switch The second operation of switching the terminal connected to the first capacitor C11 of the motor M to the second terminal by setting the switch SW15 to the OFF state and the sixth switch SW16 to the ON state is approximately 180 of the motor M. Switch control alternately every rotation of °.

Next, the motor drive control process of the motor drive device having the above-described configuration will be described.
12 and 13 are diagrams schematically showing the switching state of the switches constituting the motor drive device 100. FIG. FIG. 14 is a diagram illustrating an example of a timing chart according to the motor drive control process.

  When the motor M is first rotated by a predetermined angle (180 °) after the power is turned on, the CPU 131 of the control unit 103 reads out and executes the first switching control program 133a from the ROM 133 to execute the first switching control. Do step.

  That is, at time t11 shown in FIG. 14, the CPU 131 turns on the first switch SW11, the fourth switch SW14, and the fifth switch SW15 as shown in FIG. The switch SW12 and the sixth switch SW16 are turned off to connect the first capacitor C11 and the first terminal m11 of the motor M to supply power from the power source 102 to the motor M. As a result, the current from the power source 102 flows to the motor M via the first switch SW11, the first capacitor C11, the fourth switch SW14, and the first terminal m11, and the motor M is driven to rotate approximately 180 °. And charge storage in the first capacitor C11. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 102) via the fifth switch SW15.

At the next time t12 in FIG. 14, the CPU 131 turns off the fourth switch SW14 to stop the supply of power to the motor M, and at the moment when the fourth switch SW14 is switched from the ON state to the OFF state. The eighth switch SW18 is switched from the OFF state to the ON state, and the negative counter electromotive force generated from the motor M is regenerated to the first capacitor C11 through the second diode D12. After that, the CPU 131 switches the eighth switch SW18 from the ON state to the OFF state at time t13 in FIG. 14, and ends the regeneration of the negative counter electromotive force by the first capacitor C11.
Thereafter, at time t14 in FIG. 14 (after approximately one second has elapsed from time t11), the CPU 131 switches the terminal connected to the first capacitor C11 of the motor M from the first terminal m11 to the second terminal m12. Perform the action. That is, as shown in FIG. 12B, the CPU 131 switches the first switch SW11 and the fifth switch SW15 from the ON state to the OFF state, and at the same time the second switch SW12, the third switch SW13, and the sixth switch SW15. The switch SW16 is switched from the OFF state to the ON state, and the first capacitor C11 and the second terminal m12 of the motor M are connected to supply power to the motor M. As a result, the current from the power source 102 flows to the motor M via the second switch SW12, the first capacitor C11, the third switch SW13, and the second terminal m12, and the motor M is driven to rotate approximately 180 °. Is done. At this time, a current flows in a state where the electric charge stored in the first capacitor C11 is added to the power supply voltage supplied from the power supply 102, that is, in a state where the drive voltage of the motor M is substantially increased, and the motor M Is rotated. Therefore, since the motor M is easy to rotate, the width of the applied drive pulse can be narrowed.
Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 102) via the sixth switch SW16.

  Further, when the motor M is driven to rotate approximately 180 ° as described above, electric charge is stored in the first capacitor C11 from the second terminal m12 side as shown in FIG.

Then, after the first switching control step, the CPU 131 of the control unit 103 reads and executes the second switching control program 133b from the ROM 133 and performs the second switching control step.
That is, at the time t15 in FIG. 14, the CPU 131 turns off the third switch SW13 to stop the power supply to the motor M, and at the moment when the third switch SW13 is switched from the ON state to the OFF state. The seventh switch SW17 is switched from the OFF state to the ON state, and the negative counter electromotive force generated from the motor M is regenerated to the first capacitor C11 through the first diode D11. Thereafter, the CPU 131 switches the seventh switch SW17 from the ON state to the OFF state at time t16 in FIG. 14, and ends the regeneration of the negative back electromotive force by the first capacitor C11.

Thereafter, at time t17 in FIG. 14 (after approximately one second has elapsed from time t14), the CPU 131 switches the terminal connected to the first capacitor C11 of the motor M from the second terminal m12 to the first terminal m11. A first operation is performed. That is, as shown in FIG. 13A, the CPU 131 switches the first switch SW11, the fourth switch SW14, and the fifth switch SW15 from the OFF state to the ON state, and the second switch SW12 and the sixth switch SW12. The switch SW16 is switched from the ON state to the OFF state, and the first capacitor C11 and the first terminal m11 of the motor M are connected to supply power to the motor M. As a result, the current from the power source 102 flows to the motor M via the first switch SW11, the first capacitor C11, the fourth switch SW14, and the first terminal m11, and the motor M is driven to rotate approximately 180 °. Is done. At this time, a current flows in a state where the electric charge stored in the first capacitor C11 is added to the power supply voltage supplied from the power supply 102, that is, in a state where the drive voltage of the motor M is substantially increased, and the motor M Is rotated.
Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 102) via the fifth switch SW15.

  When the motor M is rotated approximately 180 ° as described above, electric charge is stored in the first capacitor C11 from the first terminal m11 side as shown in FIG. 13B.

  Thereafter, at time t18 in FIG. 14, the CPU 131 turns off the fourth switch SW14 to stop the supply of power to the motor M, and at the moment when the fourth switch SW14 is switched from the ON state to the OFF state. The eighth switch SW18 is switched from the OFF state to the ON state, and the negative counter electromotive force generated from the motor M is regenerated to the first capacitor C11 through the first diode D11. After that, the CPU 131 switches the seventh switch SW17 from the ON state to the OFF state at time t19 in FIG. 14, and ends the regeneration of the negative counter electromotive force by the first capacitor C11.

After that, at time t20 in FIG. 14 (after approximately one second has elapsed from time t17), the CPU 131 switches the terminal connected to the first capacitor C11 of the motor M from the first terminal m11 to the second terminal m12. A second operation is performed. That is, the CPU 131 switches the first switch SW11 and the fifth switch SW15 from the ON state to the OFF state and switches the second switch SW12, the third switch SW13, and the sixth switch SW16 from the OFF state to the ON state. Then, the first capacitor C11 and the second terminal m12 of the motor M are connected to supply power to the motor M. As a result, the current from the power source 102 flows to the motor M via the second switch SW12, the first capacitor C11, the third switch SW13, and the second terminal m12, and the motor M is driven to rotate approximately 180 °. Is done. At this time, a current flows in a state where the electric charge stored in the first capacitor C11 is added to the power supply voltage supplied from the power supply 102, that is, in a state where the drive voltage of the motor M is substantially increased. M is driven to rotate.
Then, at time t21 in FIG. 14, the CPU 131 turns off the third switch SW13 to stop the supply of power to the motor M, and at the moment when the third switch SW13 is switched from the ON state to the OFF state. The seventh switch SW17 is switched from the OFF state to the ON state, and the negative counter electromotive force generated from the motor M is regenerated to the first capacitor C11 through the first diode D11. Thereafter, at time t22, the CPU 131 switches the seventh switch SW17 from the ON state to the OFF state, and ends the regeneration of the negative counter electromotive force by the first capacitor C11.

  The motor M is rotationally driven by alternately switching the first operation and the second operation for each rotation of the motor M by approximately 180 °.

As described above, according to the motor drive device 100 of the third embodiment, since the first capacitor C11 is disposed between the motor M and the power source 102 to form a resonance circuit, conventionally, it is wasteful. The current that continues to flow due to the direct current resistance component can be reduced, and the driving power can be reduced.
Further, the terminal connected to the first capacitor C11 of the motor M is exchanged every rotation of the motor M by approximately 180 °, and the charge accumulated in the first capacitor C11 is added to the power supply voltage, that is, The motor M can be rotationally driven by passing a current in a state where the voltage is higher than the drive voltage. Specifically, in the first switching control step, of the first and second switches SW11 and SW12 connected between the power source 102 and the first capacitor C11 under the control of the CPU 131. The first switch SW11 is turned on and the second switch SW12 is turned off, and the third and fourth switches SW13 and SW14 connected between the first capacitor C11 and the motor M are turned on. The fourth switch SW14 is turned on, the third switch SW13 is turned off, and the fifth of the fifth and sixth switches SW15 and SW16 provided on the ground side of the motor M is turned on. The switch SW15 is turned on and the sixth switch SW16 is turned off. Further, in the second switching control step, under the control of the CPU 131, in the first operation, the first switch SW11 is turned off and the second switch SW12 is turned on, and While the fourth switch SW14 is turned off and the third switch SW13 is turned on, and the fifth switch SW15 is turned off and the sixth switch SW16 is turned on, the second switch In operation, the first switch SW11 is turned on, the second switch SW12 is turned off, the fourth switch SW14 is turned on, the third switch SW13 is turned off, and The fifth switch SW15 is turned on and the sixth switch SW16 is turned off.
As a result, the motor M can be easily rotated, and the width of the applied drive pulse can be narrowed, thereby realizing power saving.
Therefore, it is possible to contribute to extending the life of driving with a small battery mounted on a wristwatch or the like.

  Further, back electromotive force generated by the rotation of the motor M can be regenerated in the first capacitor C11 by the first and second diodes D11 and D12 provided between the motor M and the first capacitor C11. . That is, when the back electromotive force is regenerated, the connection between the first and second diodes D11 and D12 and the first capacitor C11 is switched from the OFF state to the ON state by the seventh and eighth switches SW17 and SW18. Thus, the first and second diodes D11 and D12 can be operated for an appropriate period during which the back electromotive force can be recovered, and the back electromotive force generated by the rotation of the motor M can be regenerated in the first capacitor C11. Thus, further power saving can be realized.

Here, the amount of current when the motor M of the motor drive device 100 of the third embodiment is rotating and when not rotating will be described with reference to FIGS. 15 and 16.
FIG. 15 is a diagram schematically showing the amount of current when the motor M is rotating and when it is not rotating. FIG. 16 is a diagram schematically illustrating a resonance circuit that constitutes the motor drive device 100.
In FIG. 15, the current amount when the motor of the conventional motor driving device is rotated is indicated by a one-dot chain line S <b> 1, and the current amount when the motor is not rotated is indicated by a two-dot chain line S <b> 2. The amount of current when the motor of the driving device 100 is rotating is represented by a solid line S3, and the amount of current when the motor is not rotating is represented by a broken line S4. In FIG. 15, L10 represents the inductance of the coil of the motor M, and R11 and R12 represent the DC resistance of the coil.

  As shown in FIG. 15, the motor M acts on the rotor to generate a rotational torque due to the generation of magnetic flux due to the inductance of the coil, but a current starts to flow gradually from the time of voltage application. Then, the motor M starts to rotate. After the current amount S1 reaches the maximum point P1, the current amount S1 decreases due to the back electromotive force as the flux linkage is cut out. Here, in the case of the conventional motor driving device, at least the portion after the minimum point P2 of the current change during motor rotation (the shaded portion SH in FIG. 15) does not contribute to the rotation of the motor M, and the motor M has inertia. It is rotating at.

However, in the case of the third embodiment, since the first capacitor C11 is inserted between the power source 102 and the motor M, a resonance circuit is configured by the inductance of the first capacitor C11 and the coil of the motor M ( (See FIG. 16).
When a voltage is applied to the first switch SW11, the fourth switch SW14, and the fifth switch SW15 at a predetermined timing, a current flows through the first capacitor C11 to the motor M (charges move). Then, electric power is supplied to the motor M and the motor M starts to rotate. At this time, the current is repeatedly attenuated by the resonance circuit at a predetermined frequency and the useless current is reduced (see FIG. 15). Therefore, the inductance of the motor M and the resonance frequency by the first capacitor C11 are taken into consideration. Thus, if the time for turning on the first switch SW11, the fourth switch SW14, and the fifth switch SW15 is set, the power that does not contribute to the rotation operation of the motor M can be reduced.
Further, when the motor M rotates 180 °, the current flowing through the motor M decreases, so that the first switch SW11, the fourth switch SW14, and the fifth switch SW15 are turned off. Here, since charge is accumulated in the first capacitor C11, the connection terminal of the first capacitor C11 and the motor M is switched to the opposite terminal, that is, the second switch SW12, the third switch Since the switch SW13 and the sixth switch SW16 are turned on and the electric charge stored in the first capacitor C11 can be used for the next 180 ° rotation of the motor M, electric power can be used effectively.

<Modification 1>
As shown in FIG. 17, the motor drive device 200 of Modification 1 does not include the seventh switch SW <b> 17 and the eighth switch SW <b> 18, and is connected to the third capacitor C <b> 12 and the motor M. Diode D13 and fourth diode D14.
That is, the third diode D13 regenerates the back electromotive force generated from the motor M in the second capacitor C12 at the moment when the third switch SW13 is switched from the ON state to the OFF state.
Further, the fourth diode D14 regenerates the back electromotive force generated from the motor M in the second capacitor C12 at the moment when the fourth switch SW14 is switched from the ON state to the OFF state.

  Thus, according to the motor drive device 200 of the first modification, it is not necessary to include the seventh switch SW17 and the eighth switch SW18 in the third embodiment, and the configuration of the motor drive circuit is further simplified. Can do.

  In the first modification, predetermined switches (seventh switch SW17 and eighth switch SW18) may be provided instead of the third diode D13 and the fourth diode D14.

[Fourth Embodiment]
FIG. 18 is a diagram schematically showing a circuit configuration of a motor drive device 300 according to the fourth embodiment to which the present invention is applied.
Note that the motor drive device 300 of the fourth embodiment is substantially the same as the third embodiment except for the circuit configuration of the motor drive circuit 301. Is omitted.

  As shown in FIG. 18, the motor drive circuit 301 included in the motor drive device 300 of the fourth embodiment includes a motor M, third and fourth capacitors C13 and C14, and 21st to 29th switches SW21 to SW29. And fifth and sixth diodes D15 and D16.

  The third capacitor C13 is provided between the motor M and the power source 102, and the fourth capacitor C14 is provided on the ground side of the motor M.

The twenty-first switch SW21 and the twenty-second switch SW22 are connected to the second terminal m12 of the motor M, and the twenty-third switch SW23 and the twenty-fourth switch SW24 are connected to the first terminal m11 of the motor M. Yes.
The 25th switch SW25 is connected between the fifth diode D15 and the sixth diode D16 and the power supply 102.
The 26th switch SW26 and the 27th switch SW27 are connected to the left side of the third capacitor C13, and the 28th switch SW28 and the 29th switch SW29 are connected to the right side of the third capacitor C13. Yes.

  The fifth diode D15 is provided between the motor M and the fourth capacitor C14, and is connected to the second terminal m12 of the motor M. The sixth diode D16 is provided between the motor M and the fourth capacitor C14, and is connected to the first terminal m11 of the motor M.

Next, the motor drive control process will be described with reference to FIG.
Here, FIG. 19 is a diagram illustrating an example of a timing chart relating to the motor drive control process.

  When the motor M is first rotated by a predetermined angle (180 °) after the power is turned on, the CPU 131 of the control unit 103 causes the twenty-first switch SW21, the twenty-fourth switch SW24, and the twenty-sixth switch at time t31. The SW 26 and the 28th switch SW28 are turned on and the 23rd switch SW23, the 27th switch SW27 and the 29th switch SW29 are turned off, and the second terminal m12 of the motor M and the power source 102 are connected. Electric power is supplied to the motor M while accumulating in the third capacitor C13.

Then, at time t32, the CPU 131 turns off the 24th switch SW24 and collects the back electromotive force generated from the motor M at that moment in the fourth capacitor C14 by the sixth diode D16.
Further, the CPU 131 switches the 25th switch SW25 from the OFF state to the ON state at the moment when the 24th switch SW24 is switched from the ON state to the OFF state, and supplies the back electromotive force accumulated in the fourth capacitor C14 as the power source. Regenerate to 102.
Thereafter, at time t33, the CPU 131 switches the 25th switch SW25 from the ON state to the OFF state, and ends the regeneration of the back electromotive force.

Then, at time t34 (after approximately one second has elapsed from time t31), the CPU 131 performs an operation of switching the terminal connected to the power source 102 of the motor M from the second terminal m12 to the first terminal m11. That is, the CPU 131 switches the twenty-first switch SW21, the twenty-sixth switch SW26, and the twenty-eighth switch SW28 from the ON state to the OFF state, and at the same time, the twenty-second switch SW22, the twenty-third switch SW23, the twenty-seventh switch SW27, and the twenty-seventh switch SW27. The switch SW29 of 29 is switched from the OFF state to the ON state, and electric power is supplied to the motor M. At this time, electric power is supplied to the motor M in a state where the electric charge stored in the third capacitor C13 is added to the power supply voltage supplied from the power supply 102.
Then, at time t35, the CPU 131 turns off the twenty-second switch SW22 and collects the back electromotive force generated from the motor M at that moment in the fourth capacitor C14 by the fifth diode D15.
Further, the CPU 131 switches the 25th switch SW25 from the OFF state to the ON state at the moment when the 22nd switch SW22 is switched from the ON state to the OFF state, and supplies the back electromotive force accumulated in the fourth capacitor C14 as the power source. Regenerate to 102.
Thereafter, at time t36, the CPU 131 switches the 25th switch SW25 from the ON state to the OFF state, and ends the regeneration of the back electromotive force.

  Then, the motor M is driven to rotate by alternately switching the same operation as described above for each rotation of the motor M by approximately 180 °.

As described above, according to the motor driving device 300 of the fourth embodiment, since the resonance circuit is configured by the motor M and the third capacitor C13, the current that continues to flow with the DC resistance component that has been wasted conventionally. And the driving power can be reduced.
Further, the terminal connected to the third capacitor C13 of the motor M is exchanged every rotation of the motor M by approximately 180 °, and the charge accumulated in the third capacitor C13 is added to the power supply voltage, that is, The motor M can be rotationally driven by passing a current in a state where the voltage is higher than the drive voltage. As a result, the motor M can be easily rotated, and the width of the applied drive pulse can be narrowed, thereby realizing power saving.
Therefore, it is possible to contribute to extending the life of driving with a small battery mounted on a wristwatch or the like.

The present invention is not limited to the above-described embodiment, and various improvements and design changes may be made without departing from the spirit of the present invention.
In the above embodiment, the back electromotive force generated from the motor M is regenerated to the first capacitor C11 and the second capacitor C12, but may be regenerated to the power source 102.

  The configuration of the motor drive circuit exemplified in the third and fourth embodiments is only an example and is not limited to this. When the motor M is rotated by a predetermined angle, electric charges are accumulated in the capacitor. Any configuration can be used as long as the motor M is driven by adding the charge accumulated in the capacitor to the power supply voltage supplied from the power source during the rotation operation of the motor at a predetermined angle. good.

  In addition, in the above embodiment, the functions as the first switching control unit and the second switching control unit are realized by executing a predetermined program or the like by the CPU 131 of the control unit 103. However, the present invention is not limited to this, and a logic circuit for realizing various functions may be used.

[Fifth Embodiment]
FIG. 20 is a block diagram showing a schematic configuration of a motor drive device 400 according to a fifth embodiment to which the present invention is applied.

In FIG. 20, the motor driving device 400 of the fifth embodiment accumulates the back electromotive force and electric charge generated in the coil of the motor M in the capacitor C <b> 30, and the accumulated back electromotive force and electric charge are supplied from the power source 403. The motor M is driven by being superimposed on the power supply voltage.
The motor driving device 400 is mounted on an electronic device such as a wristwatch and drives a DC motor such as a stepping motor that rotates an hour hand, a minute hand, a second hand, and the like. Specifically, as shown in FIG. 20, the motor driving device 400 includes a motor driving circuit 401, a voltage monitoring amplifier 402, a power source 403, a control unit 404, and the like.

  The motor drive circuit 401 includes a capacitor C30, first to ninth switches SW31 to SW39, and the like.

The motor driving circuit 401 is configured to step-drive the motor M by a predetermined angle (for example, 180 ° of half rotation) based on application of a pulse.
The motor M includes a first terminal (one terminal) m1 connected to the third switch SW33, the fourth switch SW34 and the sixth switch SW36, the first switch SW31, the second switch SW32 and the second switch SW32. And a second terminal (the other terminal) m2 connected to the five switches SW35.

  The capacitor C30 is disposed between the motor M and the power source 403 via the fifth switch SW35 to the ninth switch SW39. And the capacitor | condenser C30 comprises an electrical storage means, regenerates the counter electromotive force which arises in a coil by rotation of the motor M, and accumulate | stores it as regenerative electric power.

  The first to ninth switches SW31 to SW39 are composed of field effect transistors or the like. In addition, the first to ninth switches SW31 to SW39 are connected to the control unit 404 through signal lines, and are turned on or off under the control of the control unit 404, thereby connecting circuit wiring. Is to be switched.

The amplifier 402 is connected to the sixth switch SW36 and the capacitor C30, and detects the back electromotive force stored in the capacitor C30. The output of the amplifier 402 is input to an AD converter (not shown) of the control unit 404 and the voltage is monitored. And the control part 404 performs the process which determines the presence or absence of rotation of the motor M as a motor rotation determination means.
Specifically, based on the output of amplifier 402, control unit 404 detects the amount of counter electromotive force generated in the coil of motor M and stored in capacitor C30, and the detected amount of counter electromotive force is determined in advance. The presence or absence of rotation of the motor M is determined depending on whether or not the predetermined value is exceeded.

  The power supply 403 generates a voltage having a predetermined magnitude and supplies it as a power supply voltage for driving the motor driving device 400.

  The control unit 404 includes a CPU 441, a RAM 442, a ROM 443, and the like, and controls driving of each unit of the motor drive device 400.

The control unit 404, together with the seventh switch SW37 and the ninth switch SW39, constitutes charge accumulation control means.
That is, the CPU 441 of the control unit 404 is supplied from the power supply 403 when it is determined that the motor M is not rotating by the output of the amplifier 402 based on the execution of the charge accumulation control program 443a stored in the ROM 443. A first control step for accumulating charges in the capacitor C30 is performed.
Specifically, as shown in FIG. 22A, the CPU 441 of the control unit 404 turns on the first switch SW31 and the fourth switch SW34 to supply power to the motor M, and then the motor M rotates. If it is determined by the output of the amplifier 402 that it is not, the seventh switch SW37 and the ninth switch SW39 are turned on based on the execution of the charge accumulation control program 443a as shown in FIG. Then, the electric charge supplied from the power source 403 is accumulated in the capacitor C30.

The control unit 404 constitutes motor drive control means together with the second switch SW32, the fourth switch SW34 to the sixth switch SW36, and the eighth switch SW38.
That is, the CPU 441 of the control unit 404 superimposes the electric charge stored in the capacitor C30 on the power supply voltage supplied from the power supply 403 based on the execution of the first motor drive control program 443b stored in the ROM 443. A second control step for driving is performed.
Specifically, the CPU 441 of the control unit 404 sets the seventh switch SW37 and the ninth switch SW39 to the OFF state based on the execution of the first motor drive control program 443b, as shown in FIG. In addition, the fourth switch SW34, the fifth switch SW35, and the eighth switch SW38 are turned on to superimpose the electric charge stored in the capacitor C30 on the power supply voltage supplied from the power supply 403, and the motor M is rotated halfway. Rotate.
Alternatively, the CPU 441 turns off the seventh switch SW37 and the ninth switch SW39 based on the execution of the first motor drive control program 443b, and sets the second switch SW32, the sixth switch SW36, and the eighth switch The switch SW38 is turned on to superimpose the electric charge stored in the capacitor C30 on the power supply voltage supplied from the power supply 403, so that the motor M is driven to rotate half rotation.

Further, the control unit 404 constitutes a power regeneration control means together with the seventh switch SW37 and the ninth switch SW39.
That is, the CPU 441 of the control unit 404 performs control to regenerate the regenerative power stored in the capacitor C30 to the power source 403 based on the execution of the power regeneration control program 443c stored in the ROM 443.
Specifically, the CPU 441 of the control unit 404 sets the seventh switch SW37 and the ninth switch SW39 to the ON state based on the execution of the power regeneration control program 443c, and supplies the regenerative power stored in the capacitor C30 to the power source 403. Regenerate.

Next, the motor drive control process of the motor drive device 400 having the above-described configuration will be described.
FIG. 21 is a diagram illustrating an example of a timing chart according to the motor drive control process. FIG. 22 is a diagram schematically showing a switching state of the first switch SW31 to the ninth switch SW39 constituting the motor driving device 400.
In the normal state, the eighth switch SW38 is in an OFF state and the ninth switch SW39 is in an ON state.

  When the motor M is first rotated at a predetermined angle (half rotation of 180 °) after the power supply to the motor driving device 400 is turned on, the CPU 441 performs the process shown in FIG. 22A at time t41 shown in FIG. As described above, the first switch SW31 and the fourth switch SW34 are turned on and the third switch SW33 is turned off to connect the power source 403 and the second terminal m2 of the motor M to supply power to the motor M. The power from 403 is supplied. As a result, the current from the power supply 403 flows to the motor M via the first switch SW31 and the second terminal m2, and the motor M is driven to rotate by approximately 180 °. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the fourth switch SW34.

  At the next time t42 in FIG. 21, the CPU 441 changes the first switch SW31 from the ON state to the OFF state, stops the power supply to the motor M, and switches the first switch SW31 from the ON state to the OFF state. At the moment, the fifth switch SW35 is switched from the OFF state to the ON state, and the back electromotive force generated in the coil of the motor M is regenerated and accumulated in the capacitor C30. After that, the CPU 441 switches the fifth switch SW35 from the ON state to the OFF state at time t43 in FIG. 21, that is, at the timing when the counter electromotive force disappears, and regenerative power (back electromotive force) by the capacitor C30. The accumulation of is terminated.

Then, at time t44 in FIG. 21, the CPU 441 reads out and executes the power regeneration control program 443c from the ROM 443, switches the seventh switch SW37 from the OFF state to the ON state, and stores the regenerative power stored in the capacitor C30. (Back electromotive force) is regenerated in the power source 403.
Thereby, the energy regenerated from the motor M can be returned to the power source 403 and effectively used, and power saving can be achieved.

  Thereafter, the CPU 441 switches the seventh switch SW37 from the ON state to the OFF state to regenerate at time t45 in FIG. 21, that is, at the timing when the regenerative power (counterelectromotive force) accumulated in the capacitor C30 is exhausted. Ends regeneration of power.

  Next, when the motor M is further rotated by a predetermined angle (half rotation of 180 °), the CPU 441 performs the second switch SW32 at time t46 (after approximately one second has elapsed from time t41) shown in FIG. The third switch SW33 is turned on and the fourth switch SW34 is turned off to connect the power supply 403 and the first terminal m1 of the motor M to supply power from the power supply 403 to the motor M. As a result, the current from the power source 403 flows to the motor M via the third switch SW33 and the first terminal m1, and the motor M is driven to rotate about 180 ° next. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the second switch SW32.

  At the next time t47 in FIG. 21, the CPU 441 turns off the third switch SW33 to stop the supply of power to the motor M, and at the moment of switching the third switch SW33 from the ON state to the OFF state. The sixth switch SW36 is switched from the OFF state to the ON state, and the back electromotive force generated in the coil of the motor M is regenerated and accumulated in the capacitor C30. Thereafter, the CPU 441 switches the sixth switch SW36 from the ON state to the OFF state at time t48 in FIG. 21, that is, at the timing when the counter electromotive force disappears, and accumulates regenerative power (back electromotive force) by the capacitor C30. Exit.

Then, at time t49 in FIG. 21, the CPU 441 reads out and executes the power regeneration control program 443c from the ROM 443, switches the seventh switch SW37 from the OFF state to the ON state, and regenerative power accumulated in the capacitor C30. (Back electromotive force) is regenerated in the power source 403.
Thereafter, the CPU 441 switches the seventh switch SW37 from the ON state to the OFF state at time t50 in FIG. 21, that is, at the timing when the back electromotive force accumulated in the capacitor C30 disappears, and ends the regeneration of the regenerative power. .

  Then, the motor M is rotationally driven by alternately switching the above operation every rotation of the motor M by approximately 180 °.

In the rotational drive of the motor M, the control unit 404 determines whether the motor M is rotating based on the output of the amplifier 402 while the fifth switch SW35 or the sixth switch SW36 is in the ON state.
Here, if it is determined that the motor M is not rotating, the CPU 441 performs a first control step of accumulating the charge supplied from the power supply 403 in the capacitor C30.

Hereinafter, the first control step will be described in detail.
At time t51 in FIG. 21, the CPU 441 turns on the first switch SW31 and the fourth switch SW34 and switches the second switch SW32 from the ON state to the OFF state, thereby switching the second power supply 403 and the second motor M. To the motor M to supply electric power from the power source 403. As a result, the current from the power supply 403 flows to the motor M via the first switch SW31 and the second terminal m2, and the motor M is driven to rotate by approximately 180 °. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the fourth switch SW34.

Then, at the next time t52 in FIG. 21, the CPU 441 changes the first switch SW31 from the ON state to the OFF state to stop the power supply to the motor M, and also turns the first switch SW31 from the ON state to OFF. At the moment of switching to the state, the fifth switch SW35 is switched from the OFF state to the ON state, and the back electromotive force generated from the motor M is regenerated in the capacitor C30.
At this time, the control unit 404 determines whether or not the motor M is rotating depending on whether or not the amount of counter electromotive force generated in the coil of the motor M is equal to or greater than a predetermined value. When the controller 404 determines that the motor M is not rotating, the CPU 441 reads out and executes the charge accumulation control program 443a from the ROM 443 at time t53 in FIG. 21, and sets the fifth switch SW35. After switching from the ON state to the OFF state, at time t54 in FIG. 21, the seventh switch SW37 is turned on for a predetermined time, and the charge supplied from the power source 403 is accumulated in the capacitor C30.
Thereafter, the CPU 441 sets the seventh switch SW37 and the ninth switch SW39 to the OFF state at time t55 in FIG. 21, that is, at the timing when the charge is sufficiently accumulated in the capacitor C30, and the fifth switch The switch SW35 and the eighth switch SW38 are switched from the OFF state to the ON state, and the charge accumulation in the capacitor C30 is finished.

  Then, at an appropriate timing, the CPU 441 performs a second control step of driving the motor M by superimposing the electric charge stored in the capacitor C30 on the power supply voltage supplied from the power supply 403.

Hereinafter, the second control step will be described in detail.
The CPU 441 reads out and executes the first motor drive control program 443b from the ROM 443 at time t55 in FIG. 21, and turns off the seventh switch SW37 and the ninth switch SW39 as shown in FIG. 22 (c). In addition, the fifth switch SW35 and the eighth switch SW38 are switched from the OFF state to the ON state, and the capacitor C30 and the second terminal m2 of the motor M are connected to supply power to the motor M. As a result, the current from the power supply 403 flows to the motor M via the eighth switch SW38, the capacitor C30, the fifth switch SW35, and the second terminal m2, and the motor M is driven to rotate approximately 180 °. . At this time, a current flows in a state where the electric charge stored in the capacitor C30 is superimposed on the power supply voltage supplied from the power supply 403, that is, in a state where the drive voltage of the motor M is increased, and the motor M is driven to rotate. Is called.
Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the fourth switch SW34.
After that, the CPU 441 switches the fifth switch SW35 and the eighth switch SW38 from the ON state to the OFF state and switches the ninth switch SW39 from the OFF state to the ON state at the next time t56 in FIG. Then, the supply of power to the motor M is stopped.

  Then, at time t57 shown in FIG. 21 (after approximately one second has elapsed from time t51), the CPU 441 further rotates the motor M at a predetermined angle (180 °) at time t46 to t50 shown in FIG. Control substantially the same as that performed is performed at times t57 to t61.

As described above, according to the motor drive device 400 of the fifth embodiment, the control unit 404 can detect the back electromotive force generated in the coil of the motor M, and can determine the presence or absence of rotation of the motor M. When it is determined that the motor M is not rotating, the first control step can be performed to accumulate the charge supplied from the power source in the capacitor C30. Then, after the first control step, the motor M can be driven by superimposing the electric charge stored in the capacitor C30 on the power supply voltage supplied from the power supply 403.
Therefore, when the motor M does not rotate, the electric charge stored in the capacitor C30 is superimposed on the power supply voltage, so that the motor M is applied with a voltage approximately twice as large as the initial energy amount and the motor has a large force approximately four times as large. M can be easily rotated, and the motor M can be rotated more reliably.

  In the fifth embodiment, when the fifth switch SW35 is turned on and the back electromotive force from the motor M is regenerated, the presence or absence of rotation of the motor M is determined. The determination timing of the presence / absence of M rotation is not limited to this. That is, when the sixth switch SW36 is turned on and the back electromotive force from the motor M is regenerated, the presence or absence of rotation of the motor M may be determined. In this case, in the second control step, The CPU 441 sets the seventh switch SW37 and the ninth switch SW39 to the OFF state based on the execution of the first motor drive control program 443b, and then the second switch SW32, the sixth switch SW36, and the eighth switch SW39. The switch SW38 is turned on to connect the first terminal m1 of the motor M and the capacitor C30, and the motor M is driven by superimposing the electric charge stored in the capacitor C30 on the power supply voltage supplied from the power supply 403. .

  Further, in the fifth embodiment, the end timing of regeneration of the back electromotive force by the capacitor C30 (for example, time t43 in FIG. 21) and the start of regeneration of the back electromotive force accumulated in the capacitor C30 to the power source 403 are started. Although the timing is different from the timing (for example, time t44 in FIG. 21) by a predetermined time, they may be synchronized so as to be substantially the same timing.

  Furthermore, the configuration of the motor drive device 400 illustrated in the fifth embodiment is an example and is not limited to this. The back electromotive force generated in the coil of the motor M is detected based on the output of the amplifier 402, and Any configuration is possible as long as it determines whether or not the motor M is rotating, and stores the electric charge supplied from the power supply 403 in the capacitor C30 when it is determined that the motor M is not rotating. good.

[Sixth Embodiment]
FIG. 23 is a diagram schematically showing a circuit configuration of a motor drive device 500 according to the sixth embodiment to which the present invention is applied.
The motor driving device 500 of the sixth embodiment is substantially the same as the fifth embodiment except for the configuration of the control unit 504, and therefore the same components are denoted by the same reference numerals and description thereof is omitted. To do.

The motor driving apparatus 500 of the sixth embodiment drives the motor M by superimposing the regenerative power accumulated in the capacitor C30 on the power supply voltage supplied from the power supply 403.
The CPU 441 of the control unit 504 constitutes motor drive control means together with the second switch SW32, the fourth switch SW34 to the sixth switch SW36, the eighth switch SW38, and the ninth switch SW39.
That is, as shown in FIG. 25B, the CPU 441 of the control unit 504 turns on the fourth switch SW34, the fifth switch SW35, and the ninth switch SW39, and reverses the coil M caused by the rotation of the motor M. After regenerating the electromotive force and storing it in the capacitor C30 as regenerative power, when it is determined that the motor M is not rotating by the output of the amplifier 402, based on the execution of the second motor drive control program 443d, As shown in FIG. 25 (c), the ninth switch SW39 is turned off, and the eighth switch SW38 is turned on, so that the regenerative power stored in the capacitor C30 is changed to the power supply voltage supplied from the power supply 403. The motor M is rotated halfway and rotated in superposition.
Alternatively, the CPU 441 turns on the second switch SW32, the sixth switch SW36, and the ninth switch SW39, regenerates the counter electromotive force generated in the coil by the rotation of the motor M, and accumulates the regenerative power in the capacitor C30. After that, when it is determined by the output of the amplifier 402 that the motor M is not rotating, the ninth switch SW39 is turned off based on the execution of the second motor drive control program 443d, and the eighth The switch SW38 is turned on, and the regenerative power stored in the capacitor C30 is superimposed on the power supply voltage supplied from the power supply 403 to drive the motor M half-turn and rotationally.

Next, the motor drive control process of the motor drive device 500 having the above-described configuration will be described.
FIG. 24 is a diagram illustrating an example of a timing chart according to the motor drive control process. FIG. 25 is a diagram schematically showing a switching state of the first switch SW31 to the ninth switch SW39 constituting the motor driving device 500.

  First, when the motor M is rotated by a predetermined angle (half rotation of 180 °) after the power supply to the motor driving device 500 is turned on, the CPU 441 performs the process shown in FIG. 25A at time t71 shown in FIG. As described above, the first switch SW31 and the fourth switch SW34 are turned on and the third switch SW33 is turned off to connect the power source 403 and the second terminal m2 of the motor M to supply power to the motor M. The power from 403 is supplied. As a result, the current from the power supply 403 flows to the motor M via the first switch SW31 and the second terminal m2, and the motor M is driven to rotate by approximately 180 °. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the fourth switch SW34.

  At the next time t72 in FIG. 24, the CPU 441 changes the first switch SW31 from the ON state to the OFF state, stops the power supply to the motor M, and switches the first switch SW31 from the ON state to the OFF state. At the moment, the fifth switch SW35 is switched from the OFF state to the ON state, and the back electromotive force generated in the coil of the motor M is regenerated and accumulated in the capacitor C30. After that, the CPU 441 switches the fifth switch SW35 from the ON state to the OFF state at time t73 in FIG. 24, that is, at the timing when the counter electromotive force disappears, and regenerative power (back electromotive force) by the capacitor C30. The accumulation of is terminated.

  Next, when the motor M is further rotated by a predetermined angle (half rotation of 180 °), the CPU 441 performs the second switch SW32 at time t74 (after approximately one second has elapsed from time t71) shown in FIG. The third switch SW33 is turned on and the fourth switch SW34 is turned off to connect the power supply 403 and the first terminal m1 of the motor M to supply power from the power supply 403 to the motor M. As a result, the current from the power source 403 flows to the motor M via the third switch SW33 and the first terminal m1, and the motor M is driven to rotate about 180 ° next. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the second switch SW32.

  At the next time t75 in FIG. 24, the CPU 441 turns off the third switch SW33 to stop the supply of power to the motor M, and at the moment when the third switch SW33 is switched from the ON state to the OFF state. The sixth switch SW36 is switched from the OFF state to the ON state, and the back electromotive force generated in the coil of the motor M is regenerated and accumulated in the capacitor C30. Thereafter, the CPU 441 switches the sixth switch SW36 from the ON state to the OFF state at time t76 in FIG. 24, that is, at the timing when the counter electromotive force disappears, and accumulates regenerative power (back electromotive force) by the capacitor C30. Exit.

  Then, the motor M is rotationally driven by alternately switching the above operation every rotation of the motor M by approximately 180 °.

In the rotational drive of the motor M, the control unit 504 determines whether the motor M is rotating based on the output of the amplifier 402 while the fifth switch SW35 or the sixth switch SW36 is in the ON state.
If it is determined that the motor M is not rotating, the CPU 441 performs control to drive the motor M by superimposing the regenerative power stored in the capacitor C30 on the power supply voltage supplied from the power supply 403.

  At time t77 in FIG. 24, the CPU 441 turns on the first switch SW31 and the fourth switch SW34 and switches the second switch SW32 from the ON state to the OFF state, thereby switching the second power supply 403 and the second motor M. To the motor M to supply electric power from the power source 403. As a result, the current from the power supply 403 flows to the motor M via the first switch SW31 and the second terminal m2, and the motor M is driven to rotate by approximately 180 °. Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the fourth switch SW34.

Then, at the next time t78 in FIG. 24, the CPU 441 changes the first switch SW31 from the ON state to the OFF state, stops the supply of power to the motor M, and turns off the first switch SW31 from the ON state. At the moment of switching to the state, the fifth switch SW35 is switched from the OFF state to the ON state, and the back electromotive force generated from the motor M is regenerated in the capacitor C30.
At this time, the control unit 504 determines whether or not the motor M is rotating according to whether or not the amount of counter electromotive force generated in the coil of the motor M is equal to or greater than a predetermined value. If it is determined by the output of the amplifier 402 that the motor M is not rotating, the CPU 441 reads out and executes the second motor drive control program 443d from the ROM 443 at time t79 in FIG. As shown in c), the ninth switch SW39 is turned off and the eighth switch SW38 is switched from the OFF state to the ON state to connect the capacitor C30 and the second terminal m2 of the motor M. Electric power is supplied to the motor M. As a result, the current from the power supply 403 flows to the motor M via the eighth switch SW38, the capacitor C30, the fifth switch SW35, and the second terminal m2, and the motor M is driven to rotate approximately 180 °. . At this time, when the regenerative power stored in the capacitor C30 is superimposed on the power supply voltage supplied from the power supply 403, that is, when the drive voltage of the motor M is increased, the current flows and the motor M is driven to rotate. Done.
Then, the current flowing through the motor M flows down to the ground (the cathode of the power supply 403) via the fourth switch SW34.
After that, the CPU 441 switches the fifth switch SW35 and the eighth switch SW38 from the ON state to the OFF state and switches the ninth switch SW39 from the OFF state to the ON state at the next time t80 in FIG. Then, the supply of power to the motor M is stopped.

  Then, at time t81 shown in FIG. 24 (after approximately one second has elapsed from time t77), the CPU 441 performs a predetermined angle (180 °) to further rotate the motor M at times t74 to t76 shown in FIG. Control substantially the same as that performed is performed at times t81 to t83.

As described above, according to the motor drive device 400 of the sixth embodiment, the counter electromotive force generated in the coil of the motor M can be accumulated in the capacitor C30 as regenerative power, and the counter electromotive force is output by the output of the amplifier 402. It can be detected to determine whether or not the motor M is rotating. When it is determined that the motor M is not rotating, the regenerative power stored in the capacitor C30 is superimposed on the power supply voltage supplied from the power supply 403. Thus, the motor M can be driven.
Therefore, when the motor M does not rotate, the regenerative power stored in the capacitor C30 is superimposed on the power supply voltage, so that a maximum voltage of about twice is applied to the motor M and the initial energy amount is about four times larger. The motor M can be easily rotated, and the motor M can be rotated more reliably.

  In the sixth embodiment, when the fifth switch SW35 is turned on and the back electromotive force from the motor M is regenerated, the presence or absence of rotation of the motor M is determined. The determination timing of the presence / absence of M rotation is not limited to this. That is, when the sixth switch SW36 is turned on to regenerate the counter electromotive force from the motor M, the presence or absence of rotation of the motor M may be determined. In this case, the CPU 441 drives the second motor. Based on the execution of the control program 443d, the ninth switch SW39 is turned off, the second switch SW32, the sixth switch SW36, and the eighth switch SW38 are turned on, and the capacitor C30 and the motor M are turned on. The motor M is driven by superimposing the regenerative power stored in the capacitor C30 on the power supply voltage supplied from the power supply 403 by connecting the terminal 1 to the first terminal m1.

  In the sixth embodiment, when the regenerative electric energy stored in the capacitor C30 is monitored by the amplifier 402 and it is determined that the power supply voltage is exceeded, the fourth switch SW34 and the fifth switch SW35 are used. The ninth switch SW39, or the second switch SW32, the sixth switch SW36, and the ninth switch SW39 are turned on, and the motor M is rotated using only the regenerative power accumulated in the capacitor C30. May be.

  In addition, in the sixth embodiment, the seventh switch SW37 may be turned on at a predetermined timing, and the regenerative power stored in the capacitor C30 may be regenerated to a power source or the like.

  Furthermore, the configuration of the motor drive device 500 illustrated in the sixth embodiment is an example and is not limited to this. The back electromotive force generated in the coil of the motor M is regenerated, and the regenerated power is converted into the capacitor C30. And the back electromotive force is detected based on the output of the amplifier 402 to determine whether or not the motor M is rotating. When it is determined that the motor M is not rotating, the regeneration stored in the capacitor C30 is stored. Any configuration may be used as long as the motor M is driven by superimposing power on the power supply voltage supplied from the power source 403.

In addition, this invention is not limited to the said 5th Embodiment and 6th Embodiment, You may perform a various improvement and design change in the range which does not deviate from the meaning of this invention.
In the above embodiment, when the motor M does not rotate, the electric charge stored in the capacitor C30 and the power supply voltage from the power supply 403 are applied. This voltage is applied to the capacitance of the diode, the dividing resistor, and the capacitor. It may be adjusted by the ON time of the transistor.

  Furthermore, in the above embodiment, a predetermined diode or the like may be provided instead of the first switch SW31 to the ninth switch SW39.

  In addition, in the above-described embodiment, the functions as the charge accumulation control unit, the motor drive control unit, and the power regeneration control unit are realized by executing a predetermined program or the like by the CPU 441 of the control unit 404 (504). However, the present invention is not limited to this, and a logic circuit or the like for realizing various functions may be used.

It is a block diagram which shows the timepiece drive device of 1st Embodiment of this invention. It is a top view which shows the specific structural example of the motor of FIG. It is a time chart explaining operation | movement of switch SW1-SW4. (A) (B) (C) (D) is explanatory drawing which shows the flow of an electric current when a motor rotates 1 step. (A), (B), (C), and (D) are explanatory diagrams showing the flow of current when the motor rotates one more step. It is a wave form diagram explaining the effect | action by which the consumption current of a motor is reduced with a capacitor | condenser. FIG. 5 is a waveform diagram showing a simplified relationship between a motor driving voltage and a driving current. It is a flowchart of the pulse width correction process performed by CPU of a control part. It is a block diagram which shows the drive device for timepieces of 2nd Embodiment of this invention. It is a flowchart of the pulse width correction process performed by CPU of the control part of 2nd Embodiment. It is a block diagram which shows schematic structure of the motor drive device of 3rd Embodiment to which this invention is applied. It is a figure which shows typically the switching state of the switch which comprises the motor drive device of FIG. It is a figure which shows typically the switching state of the switch which comprises the motor drive device of FIG. It is a figure which shows an example of the timing chart which concerns on the motor drive control process by the motor drive device of FIG. It is a figure which shows typically the resonance circuit which comprises the motor drive device of FIG. It is a figure which shows typically the electric current amount at the time of rotation and non-rotation of a motor. It is a figure which shows typically the circuit structure of the motor drive device of the modification 1. It is a figure which shows typically the circuit structure of the motor drive device of 4th Embodiment to which this invention is applied. It is a figure which shows an example of the timing chart which concerns on the motor drive control process by the motor drive device of FIG. It is a block diagram which shows schematic structure of the motor drive device of 5th Embodiment to which this invention is applied. It is a figure which shows an example of the timing chart which concerns on the motor drive control process by the motor drive device of FIG. (A) (b) (c) is a figure which shows typically the change of the switching state of the switch which comprises the motor drive device of FIG. It is a block diagram which shows schematic structure of the motor drive device of 6th Embodiment to which this invention is applied. It is a figure which shows an example of the timing chart which concerns on the motor drive control process by the motor drive device of FIG. (A) (b) (c) is a figure which shows typically the change of the switching state of the switch which comprises the motor drive device of FIG.

Explanation of symbols

1, 1B drive device 2 motor 5 battery 7 amplifier 10 control unit 11 CPU
12 RAM
13 ADC
14 ROM
C1 Capacitor PLS1, PLS2 Drive pulse R1 Current detection resistor SW1-SW4 Switch TA, TB Power supply terminal

Claims (6)

A motor that rotationally drives by alternately supplying drive pulses of different polarities;
A first power supply terminal and a second power supply terminal to which DC power is supplied;
A capacitive element connected in series to the first terminal side of the motor;
Switch means capable of alternately switching the connection on the second terminal side of the motor and the connection on the terminal side opposite to the motor of the capacitive element to the first power supply terminal and the second power supply terminal;
Control means for controlling the operation of the switch means so that drive pulses having different polarities are alternately applied to the motor by the DC power supply;
A drive device comprising: The switch means includes
A first switch for connecting / disconnecting a terminal opposite to the motor of the capacitive element and the first power supply terminal;
A second switch for connecting / disconnecting a terminal opposite to the motor of the capacitor and the second power supply terminal;
A third switch for connecting / disconnecting the second terminal of the motor and the first power supply terminal;
A fourth switch for connecting / disconnecting the second terminal of the motor and the second power supply terminal;
The drive device according to claim 1, comprising: Voltage detecting means for detecting the voltage of the DC power supply,
The control means includes
3. The switch unit is operated according to claim 1 or 2, wherein when the voltage of the DC power supply is lowered based on detection by the voltage detection unit, the switch unit is operated so that a period for supplying a drive pulse to the motor becomes long. Drive device. Current detection means for detecting a current flowing through the second power supply terminal;
The control means includes
2. The switch means is operated so that a period for supplying a drive pulse to the motor becomes longer when the amount of current flowing to the second power supply terminal is reduced based on detection by the current detection means. Or the drive device of 2.   5. The driving apparatus according to claim 1, wherein an anode and a cathode of a battery are connected to the first power supply terminal and the second power supply terminal to supply the DC power. A drive device according to any one of claims 1 to 5, comprising:
A timepiece drive device characterized in that the timepiece hands are moved by rotation of the motor.

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