JP3908387B2 - Electronically controlled mechanical clock and control method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention converts the mechanical energy of a mechanical energy source such as a mainspring into electrical energy by a generator, and operates the rotation control means by the electrical energy to control the rotation cycle of the generator, thereby rotating the wheel. The present invention relates to an electronically controlled mechanical timepiece for accurately driving a pointer fixed to a row and a control method therefor.
[0002]
[Background]
The mechanical energy when the mainspring is opened is converted into electrical energy by a generator, and the rotation control means is operated by the electrical energy to control the value of the current flowing in the generator coil, which is fixed to the train wheel. As electronically controlled mechanical timepieces that accurately drive the hands to be displayed and display the time accurately, those described in Japanese Patent Publication No. 7-198112 and Japanese Patent Laid-Open No. 8-50186 are known.
[0003]
Japanese Patent Publication No. 7-19812 discloses an angular range in which the brake is turned off to increase the rotational speed of the rotor to increase the power generation amount during one rotation of the rotor, that is, every reference signal period, and the brake An angle range that is multiplied by a low speed is provided, and the generated power is improved while the rotational speed is high, and the speed is adjusted so as to compensate for a decrease in the generated power during braking.
[0004]
Japanese Patent Laid-Open No. 8-50186 counts a reference pulse and measurement pulses detected as the rotor rotates, compares the number of reference pulses with the number of measurement pulses, In the first state where the number of pulses is smaller than the number of measurement pulses, brake control is performed by generating a brake signal with a pulse width set in response to the measurement pulse by the control means.
[0005]
[Problems to be solved by the invention]
However, in Japanese Patent Publication No. 7-119812, the brake on-control and off-control are always performed during one rotation of the rotor, that is, for each reference signal. In the case of a large deviation, the rotation control amount of the rotor for each reference signal cannot be increased so much that it takes time to shift to a normal control state and there is a problem that the responsiveness is low.
[0006]
In addition, the brake signal generated for each reference signal also has a constant pulse width in the one described in Japanese Patent Application Laid-Open No. 8-50186, so that the brake amount for each reference signal is constant even when the control is greatly out of control. As a result, there is a problem that it takes time to shift to a normal control state and the responsiveness is low.
[0007]
In addition to the circuit for detecting the first and second states by counting and comparing the reference pulse and the measurement pulse, a control means for generating a brake signal with a pulse width set in response to the measurement pulse is separately provided. There is also a problem that the configuration is complicated and the cost is high.
[0008]
SUMMARY OF THE INVENTION An object of the present invention is to provide an electronically controlled mechanical timepiece that can quickly control the speed control and can reduce the cost, and a control method therefor.
[0009]
[Means for Solving the Problems]
  An electronically controlled mechanical timepiece according to the present invention includes a mechanical energy source, a generator that is driven by the mechanical energy source connected via a train wheel to generate an induced electric power to supply electric energy, and A pointer coupled to a train wheel, rotation control means driven by the electrical energy to control the rotation period of the generator;Switching means capable of short-circuiting both ends of the generator;The rotation control means is based on a rotation detection means for detecting a rotation period of the generator and outputting a rotation detection signal corresponding to the rotation period, and a signal from a time standard source. A reference signal generating means for generating a reference signal, a first counting means for counting a reference signal from the reference signal generating means, a second counting means for counting a rotation detection signal from the rotation detecting means, and a preset value. Positive side with respect to the set count valueAnd on each minus sideMultiple countValue countMultiple count value range possibleThen, a difference count value from the count value of the first count means is obtained with reference to the count value of the second count means, and it is determined whether the difference count value is on the plus side or the minus side. When it is on the plus side, it outputs a brake-on signal, and when it is on the minus side, it outputs a brake-off signal.A comparison means;Chopper signal generating means for outputting a chopper signal having a large duty ratio with a large ratio of brake on time based on the brake on signal and a chopper signal having a small duty ratio with a small ratio of brake on time based on the brake off signal; The large duty ratio chopper signal or the small duty ratio chopper signal output from the chopper signal generating means is applied to the switching means, and the switching means is conductive only for the brake-on time. Thus, the both ends of the generator are short-circuited, the generator is braked, and a choppering operation that repeats on / off based on the duty ratio is performed.It is characterized by this.
[0010]
The electronically controlled mechanical timepiece of the present invention drives the pointer and the generator with a mechanical energy source such as a mainspring, and brakes the generator by the braking control means of the rotation control means, thereby reducing the rotation speed of the rotor, that is, the pointer. To speed up.
[0011]
  At this time, the rotation control means of the generator counts the reference signal from the reference signal generating means by the first counting means, and counts the rotation detection signal from the rotation detecting means by the second counting means. Count value and second count valueCompareComparison meansIs, The difference is positive with respect to the preset count valueAnd on each minus sideMultiple countA plurality of count value ranges in which values can be counted, a count value of a difference from the count value of the first counting means is obtained on the basis of the count value of the second counting means, and the count value of the difference is on the plus side Or a negative side, a brake on signal is output when the positive side is present, a brake off signal is output when the negative side is present, and the chopper signal generating means The chopper signal generating means outputs a chopper signal having a large duty ratio with a large ratio of brake on time based on a brake on signal and a chopper signal having a small duty ratio with a small ratio of brake on time based on the brake off signal. The chopper signal with the large duty ratio or the chopper signal with the small duty ratio output from the is applied to the switching means. Is, the switching means is braked in the generator by short-circuiting both ends of the generator by conducting only the brake-on time, performs the chopping operation of repeating the on-off based on the duty ratioIn this way, the rotational speed of the generator is regulated.
[0012]
  For this reason, when the difference is a plus side with respect to a preset set count value, a plurality of counts are performed on the plus side, and when the difference is a minus side, Since a plurality of counts are performed and the difference is stored and calculated as a cumulative value,The difference is the plus sideIf the state continues, that is, if the torque of the mechanical energy source such as the mainspring is large and the generator is rotating, the brake is applied until the difference between the count values reaches the set count value.ON signalKeep calling,When the difference continues to be on the minus side, the generator is continuously applied with a brake-off signal.Therefore, the speed can be quickly adjusted to a normal rotation speed, and control with quick response can be performed.
  In addition, since the brake on / off control is performed using chopper signals having different duty ratios, the brake (braking torque) can be made appropriate without reducing the charging voltage (generated voltage). In particular, when applying a brake-on signal, control is performed using a chopper signal with a large duty ratio, so that the braking torque can be increased while suppressing a decrease in the charging voltage, and the system stability is maintained while maintaining efficiency. Brake control can be performed. Thereby, the duration of the electronically controlled mechanical timepiece can also be increased. Further, since the chopper is controlled by the chopper signal having a small duty ratio even when the brake-off signal is applied, the charging voltage during that time can be further improved.
[0013]
Further, since the brake control is performed only by comparing the count values, the configuration of the rotation control means is simplified and the cost can be reduced.
[0015]
Further, it is preferable that the first counting means, the second counting means and the comparing means are constituted by an up / down counter. If the up / down counter is used, the count values can be compared simultaneously with the counting. Therefore, the configuration is further simplified and the difference between the count values can be easily obtained.
[0016]
  The up / down counter isSaid 1 When the count value of the counting means and the count value of the second counting means are compared and the difference is on the plus side with respect to the preset set count value, multiple counts are possible on the plus side If there is a multiple count value range and the difference is on the negative side, the negative side has a multiple count value range that allows multiple counts, and the difference is stored as a cumulative valueIt is preferable to be configured to be able to.
[0017]
For example, if an up / down counter of 2 bits or more can be used to hold a multi-stage value, not only the determination of delay or advance but also the delay amount of the second count value relative to the reference first count value Or the accumulated amount of the advance amount (multiple holding) can be stored, and as a result, the accumulated error can be corrected.
[0018]
Further, when the electrical energy from the generator is first supplied, the rotation control means is operated until the generator is driven by a predetermined number of rotations, for example, until a predetermined number of rotation detection signals are detected. The brake control means may be configured to be maintained in a non-operating state.
[0019]
When the electrical energy from the generator is supplied for the first time, that is, when the generator is started, the brake control means is not operated until the generator is driven by a predetermined number of revolutions, and the brake is not applied. The power generation action can be prioritized. Thereby, the voltage which can drive the rotation control means driven with the generated electric power can be obtained quickly, and the stability of control can be improved.
[0020]
Further, a specific counter value may be provided in the up / down counter, and the generator may be configured to be braked or not applied with this value as a boundary.
[0021]
In this way, since the brake control is performed only by comparing the respective count values, the configuration of the rotation control means is simplified and the cost can be reduced.
[0022]
The up / down counter is preferably configured to set the up / down counter within ± 1 of the specific counter value when the electrical energy from the generator is first supplied.
[0023]
In this way, since the difference between the preset value of the up / down counter and the specific counter value is small, the brake is applied immediately after the start of the rotation control, and the normal rotation speed can be quickly adjusted. , Quick control can be performed.
[0024]
Furthermore, the up / down counter,It is preferable that the range of the counter value that is controlled to apply the brake among the plurality of counter values is narrower than the range of the counter value that does not apply the brake.
[0025]
In this way, the cumulative compensation range in which the rotor rotation period is delayed from the reference period (the state in which the brake is not applied) can be widened, and the accumulated error can be effectively compensated. In other words, when the brake is applied, it is easy to bring the rotor rotation period closer to the reference period, and the accumulated error is small, so the compensation range may be small. The accumulated error may increase due to mechanical fluctuations. For this reason, if the cumulative compensation range in a state where the brake is not applied is widened, the cumulative amount of these errors can be stored, and the cumulative error can be reliably corrected.
[0026]
  An electronically controlled mechanical timepiece control method according to the present invention includes a mechanical energy source and a generator that is driven by the mechanical energy source connected via a train wheel to generate an induced electric power and supply electric energy. A pointer coupled to the wheel train, and rotation control means that is driven by the electrical energy and controls a rotation cycle of the generator.Switching means capable of short-circuiting both ends of the generator;A control method for an electronically controlled mechanical timepiece comprising: a reference signal generated on the basis of a signal from a time standard source to obtain a first count value, and an output corresponding to a rotation period of the generator The rotation detection signal is counted to obtain the second count value, which is on the plus side with respect to the preset set count valueAnd on each minus sideMultiple count valuesA count value of a difference from the first count value with reference to the second count value in a countable state, and determining whether the count value of the difference is on the plus side or the minus side; When it is on the plus side, it outputs a brake-on signal, when it is on the minus side, it outputs a brake-off signal, and the chopper signal has a large duty ratio with a large proportion of brake-on time based on the brake-on signal. And a small duty ratio chopper signal with a small ratio of brake on time based on the brake off signal, and applying the large duty ratio chopper signal or the small duty ratio chopper signal to the switching means, The switching means conducts only for the brake-on time, so that both ends of the generator are short-circuited and the generator is disconnected. The hanging, the chopping operation of repeating the on-off based on the duty ratioIt is characterized by doing.
[0027]
  With such a control method,Obtaining a count value of a difference from the first count value based on the second count value;If the difference is a plus side with respect to a preset set count value, a plurality of count values are counted on the plus side, and if the difference is a minus side, a plurality is counted on the minus side. The difference is stored and calculated as a cumulative value by counting the count value ofButWhen counting on the plus sideIn other words, when the torque of a mechanical energy source such as a spring is large and the generator is rotatingThe generator is continuously broken until the difference reaches the set count value.A chion signal is applied and counted on the negative side.In case the brake on the generator continuouslyApply off signalSince the control is performed, the braking control is performed to eliminate the difference as the cumulative value continuously.,The speed can be quickly adjusted to a normal rotation speed, and control with high responsiveness can be performed.
  In addition, since the brake on / off control is performed using chopper signals having different duty ratios, the brake (braking torque) can be made appropriate without reducing the charging voltage (generated voltage). In particular, when applying a brake-on signal, control is performed using a chopper signal with a large duty ratio, so that the braking torque can be increased while suppressing a decrease in the charging voltage, and the system stability is maintained while maintaining efficiency. Brake control can be performed. Thereby, the duration of the electronically controlled mechanical timepiece can also be increased. Further, since the chopper is controlled by the chopper signal having a small duty ratio even when the brake-off signal is applied, the charging voltage during that time can be further improved.
[0028]
  An electronically controlled mechanical timepiece control method according to the present invention includes a mechanical energy source and a generator that is driven by the mechanical energy source connected via a train wheel to generate an induced electric power and supply electric energy. A pointer coupled to the wheel train, and rotation control means that is driven by the electrical energy and controls a rotation cycle of the generator.Switching means capable of short-circuiting both ends of the generator;A reference signal generated based on a signal from a time standard source in a method for controlling an electronically controlled mechanical timepiece comprising:TheAs a down count signal,Rotation detection signal output corresponding to the rotation period of the generatorIs input to the up / down counter as an up count signal, and the count value of the up / down counter is counted in a state where a plurality of count values can be counted on each of the plus side and the minus side with respect to a preset set count value, It is determined whether the count value of the up / down counter is on the plus side or the minus side. If the count value is on the plus side, a brake on signal is output, and if it is on the minus side, a brake off signal is output. Or the reference signal is used as an up-count signal, and the rotation detection signal is input as a down-count signal to an up / down counter. The up / down counter is counted while the count value is countable. When the value is counted, it is judged whether the count value of the up / down counter is on the plus side or the minus side, and if it is on the minus side, a brake on signal is output, and if it is on the plus side Outputs a brake-off signal, a chopper signal with a large duty ratio based on the brake-on signal and a small duty ratio with a small ratio of brake-on time based on the brake-off signal. And the chopper signal having the large duty ratio or the chopper signal having the small duty ratio is applied to the switching means, and the switching means conducts only for the brake-on time to short-circuit both ends of the generator. Apply brakes to the generator and repeat on / off based on the duty ratio Perform a chopping actionIt is characterized by.
[0029]
  With such a control method, when the count value of the up / down counter is on the plus side with respect to a predetermined specific counter value, a plurality of count values are counted on the plus side, and the difference is minus. The difference is stored and calculated as a cumulative value by counting a plurality of count values on the minus side.When the reference signal is a down-count signal and the rotation detection signal is input as an up-count signal to the up / down counter and the difference is counted on the plus side of the specific counter value, or the reference signal is an up-count signal and the rotation detection signal Is input to the up / down counter as a downcount signal, and the difference is counted on the minus side of the specific counter value, that is, the torque of the mechanical energy source such as the mainspring is large and the generator is rotating. In this case, a brake on signal is continuously output to the generator until the difference reaches the specific counter value, and the difference is counted on the opposite side to the specific counter value. Control is performed to continuously output a brake off signal to the generator, and the difference as an accumulated value is linked. Since to perform the braking control to eliminate it, the brake ON signal or a brake off signal to the difference between the count value reaches the specified counter valueTherefore, it is possible to quickly adjust the speed to a normal rotation speed, and to perform control with quick response.
  In addition, since the brake on / off control is performed using chopper signals having different duty ratios, the brake (braking torque) can be made appropriate without reducing the charging voltage (generated voltage). In particular, when applying a brake-on signal, control is performed using a chopper signal with a large duty ratio, so that the braking torque can be increased while suppressing a decrease in the charging voltage, and the system stability is maintained while maintaining efficiency. Brake control can be performed. Thereby, the duration of the electronically controlled mechanical timepiece can also be increased. Further, since the chopper is controlled by the chopper signal having a small duty ratio even when the brake-off signal is applied, the charging voltage during that time can be further improved.
[0030]
In addition, if an up / down counter is used, the count values can be compared simultaneously with the counting, so that the configuration is further simplified and the difference between the count values can be easily obtained.
[0031]
DETAILED DESCRIPTION OF THE INVENTION
  less than,Reference form which is a premise of the present invention andEmbodiments of the present invention will be described with reference to the drawings.
[0032]
  FIG. 1 illustrates the present invention.First reference formFIG. 2 and FIG. 3 are cross-sectional views showing the main part of the electronically controlled mechanical timepiece.
[0033]
The electronically controlled mechanical timepiece includes a barrel 1 composed of a mainspring 1a, barrel barrel gear 1b, barrel barrel true 1c and barrel barrel lid 1d. The mainspring 1a is fixed to the barrel gear 1b at the outer end and to the barrel full 1c at the inner end. The barrel complete 1c is supported by the base plate 2 and the train wheel bridge 3, and is fixed by a square hole screw 5 so as to rotate integrally with the square hole wheel 4.
[0034]
The square wheel 4 is meshed with the coil 6 so as to rotate in the clockwise direction but not in the counterclockwise direction. Note that the method of rotating the square wheel 4 in the clockwise direction and winding the mainspring 1a is the same as in the automatic winding or manual winding mechanism of a mechanical timepiece, and thus the description thereof is omitted. The rotation of the barrel wheel 1b is increased by 7 times to the second wheel 7 and sequentially increased by 6.4 times to the third wheel 8 and then increased by 9.375 times to the fourth wheel 9 and tripled. The speed is increased 10 times to the fifth wheel 10, then to the sixth wheel 11, increased 10 times to the rotor 12, and increased to a total of 126,000 times through the respective number wheels 7 to 11 serving as a speed increasing wheel train. Has been.
[0035]
The second wheel 7 has a pinion 7a, a minute hand 13 that displays time on the pinion 7a, and a second hand 14 that displays time on the fourth pinion 9. Therefore, in order to rotate the second wheel 7 at 1 rph and the fourth wheel 9 at 1 rpm, the rotor 12 may be controlled to rotate at 5 rpm. The barrel gear 1b at this time is 1/7 rph.
[0036]
This electronically controlled mechanical timepiece includes a generator 20 including a rotor 12, a stator 15, and a coil block 16. The rotor 12 includes a rotor magnet 12a, a rotor pinion 12b, and a rotor inertia disc 12c. The rotor inertia disc 12c is for reducing the rotational speed fluctuation of the rotor 12 with respect to the driving torque fluctuation from the barrel complete 1. The stator 15 is obtained by winding a stator coil 15b of 40,000 turns around a stator body 15a.
[0037]
The coil block 16 is obtained by winding a coil 16b of 110,000 turns around a magnetic core 16a. Here, the stator body 15a and the magnetic core 16a are made of PC permalloy or the like. Further, the stator coil 15b and the coil 16b are connected in series so that an output voltage obtained by adding the respective power generation voltages can be obtained.
[0038]
  Next, a control circuit of the electronically controlled mechanical timepiece will be described with reference to FIGS. Figure 4 shows the bookreferenceThe block diagram which shows the electronically controlled mechanical timepiece of a form is shown, and the circuit diagram is shown by FIG.
[0039]
The AC output from the generator 20 is stepped up and rectified through a rectifier circuit 21 including step-up rectification, full-wave rectification, half-wave rectification, transistor rectification, and the like, and is charged and supplied to a capacitor 22 that is a power supply circuit.
[0040]
The generator 20 is connected to a brake circuit 23 including a transistor 23B as a switching element, and the generator 20 can be controlled by controlling the brake circuit 23. It is desirable to have a circuit configuration that takes into account the parasitic diode of the transistor 23B to which a diode is added.
[0041]
The rotation control means 50 includes an oscillation circuit 51, a frequency dividing circuit 52, a rotation detection circuit 53 for the rotor 12, a first counting means 54A, a second counting means 54B, a comparing means 54C, and a braking control circuit 55. . In the present embodiment, the first counting means 54A, the second counting means 54B, the comparing means 54C, and the braking control circuit 55 are configured by an up / down counter 54.
[0042]
The oscillation circuit 51 outputs an oscillation signal (32768 Hz) using a crystal resonator 51A which is a time standard source, and this oscillation signal is frequency-divided to a certain period by a frequency dividing circuit 52 composed of 12 stages of flip-flops. This frequency-divided signal is output to the first counting means 54A as an 8 Hz reference signal fs. Therefore, the oscillation circuit 51 and the frequency dividing circuit 52 constitute reference signal generating means.
[0043]
The rotation detection circuit 53 includes a waveform shaping circuit 61 and a mono multivibrator 62 connected to the generator 20. The waveform shaping circuit 61 is composed of an amplifier and a comparator, and converts a sine wave into a rectangular wave. The mono multivibrator 62 functions as a bandpass filter that passes only pulses having a certain period or less, and outputs a rotation detection signal FG1 from which noise has been removed.
[0044]
The rotation detection signal FG1 of the rotation detection circuit 53 and the reference signal fs from the frequency dividing circuit 52 are respectively input to the up-count input and the down-count input of the up / down counter 54 via the synchronization circuit 70 as shown in FIG. ing.
[0045]
The synchronization circuit 70 includes four flip-flops 71, an AND gate 72, and a NAND gate 73, and uses the signal of the fifth stage output (1024 Hz) and the sixth stage output (512 Hz) of the frequency divider 52, The rotation detection signal FG1 is synchronized with the reference signal fs (8 Hz) and adjusted so that these signal pulses are not overlapped and output.
[0046]
The up / down counter 54 is a 4-bit counter. A signal based on the rotation detection signal FG1 is input from the synchronization circuit 70 to the upcount input of the up / down counter 54, and a signal based on the reference signal fs is input to the downcount input from the synchronization circuit 70. Thus, counting of the reference signal fs and the rotation detection signal FG1 (first counting means 54A, second counting means 54B) and calculation of the difference (comparison means 54C) can be performed simultaneously.
[0047]
The up / down counter 54 is provided with four data input terminals (preset terminals) A to D. When an H level signal is input to the terminals A to C, the up / down counter 54 is initialized. The value (preset value) is set to "7" as the counter value.
[0048]
The activation setting circuit 90 is connected to the LOAD input terminal of the up / down counter 54. The startup setting circuit 90 is reset by the initialization circuit 91 that outputs the system reset signal SR when the power is first supplied to the capacitor 22 after being connected to the capacitor 22 and the system reset signal SR. A frequency dividing circuit 92 that counts that a predetermined number of rotation detection signals FG1 are input, and a flip-flop 93 that receives a signal from the frequency dividing circuit 92 as a clock input and is reset by the system reset signal SR are provided. It is configured.
[0049]
The frequency dividing circuit 92 is constituted by a four-stage flip-flop, and is configured to output an H level signal when the rotation detection signal FG1 is input for 16 pulses. Accordingly, the flip-flop 93 is set so that the H level signal is input to the LOAD input of the up / down counter 54 when the rotation detection signal FG1 is input for 16 pulses after the system reset signal SR is output. Yes.
[0050]
Since the up / down counter 54 does not accept the up / down input until the LOAD input becomes H level, that is, for a certain period after the system reset signal SR is output, the count value of the up / down counter 54 is maintained at “7”. Is done.
[0051]
The up / down counter 54 has 4-bit outputs QA to QD. Accordingly, the output QD of the fourth bit outputs an L level signal if the counter value is 7 or less, and outputs an H level signal if the counter value is 8 or more. This output QD is connected to the gate of the Nch transistor 23B of the brake circuit 23 connected in parallel to the generator 20. Therefore, when an H level signal is output from the output QD, a voltage is applied to the gate of the transistor 23B, the transistor 23B is maintained in the ON state, the generator 20 is short-circuited, and the brake is applied.
[0052]
On the other hand, when the L level signal is output from the output QD, the gate voltage of the transistor 23B decreases, so the transistor 23B is maintained in the OFF state, and the generator 20 is not braked. Therefore, since the brake circuit 23 is controlled by the output QD of the up / down counter 54, the up / down counter 54 also serves as the braking control circuit 55.
[0053]
  Then bookreferenceThe operation in the embodiment will be described with reference to the timing charts of FIGS. 6 to 8 and the flowchart of FIG.
[0054]
When the generator 20 starts to operate, a system reset signal SR is output (step 1, hereinafter “step” is abbreviated as “S”). Thereafter, after a certain period of time has elapsed, an H level signal is input from the activation setting circuit 90 to the LOAD input of the up / down counter 54 (S2). Then, as shown in FIG. 6, the up count signal based on the rotation detection signal FG1 and the down count signal based on the reference signal fs are counted by the up / down counter 54 (S3). These signals are set so as not to be simultaneously input to the counter 54 by the synchronization circuit 70.
[0055]
Therefore, when the up-count signal is input from the state where the initial count value is set to “7”, the counter value becomes “8”, and an H level signal is output from the output QD to the transistor 23B of the brake circuit 23. Then, brake-on control for braking the generator 20 is performed (S4, S5).
[0056]
Next, if the down count signal is input, the counter value returns to “7”, and the L level signal is output from the output QD, so that the brake off control that does not apply the brake of the generator 20 is performed ( S4, S6).
[0057]
On the other hand, when the torque of the mainspring 1a is large and the rotational speed of the generator 20 is high, the up-count signal may be further input after the counter value becomes “8” by the up-count signal. In this case, the counter value is “9”, and the output QD is kept at the H level, so that the brake remains applied. When the brake is kept applied, the rotational speed of the generator 20 decreases, and the reference value fs (down count signal) is input twice before the rotation detection signal FG1 is input. Decreases to “8” and “7”, and when it reaches “7”, the brake is released.
[0058]
When such control is performed, the generator 20 becomes close to the set rotation speed, and as shown in FIG. 7, the up-count signal and the down-count signal are alternately input, and the counter value is “8”. And “7” are repeated. At this time, the brake is repeatedly turned on and off according to the counter value.
[0059]
Further, when the mainspring 1a is unwound and its torque is reduced, as shown in FIG. 8, the time for braking is gradually shortened, and the rotational speed of the generator 20 is close to the reference speed even when the brake is not applied. .
[0060]
Then, even if the brake is not applied at all, a large number of down count values are input. When the count value becomes a small value of “6” or less, it is determined that the torque of the mainspring 1a has decreased, and the hand movement is stopped. The user is encouraged to wind up the mainspring 1a again by making the speed very low, or by sounding a buzzer, a lamp or the like.
[0061]
  Book like thisreferenceAccording to the form, there are the following effects.
[0062]
(1) An upcount signal based on the rotation detection signal FG1 and a downcount signal based on the reference signal fs are input to the up / down counter 54, and the count number of the rotation detection signal FG1 (upcount signal) is the reference signal fs ( In a state larger than the count number of the down count signal) (if the initial value of the counter 54 is “7”, the counter value is “8” or more), the brake circuit 23 continues to brake the generator 20, Conversely, in a state where the count number of the rotation detection signal FG1 is less than or equal to the count number of the reference signal fs (a state where the counter value is “7” or less), the brake of the generator 20 is turned off. Even if the rotation speed is greatly deviated from the reference speed, it can be quickly brought close to the reference speed, and the responsiveness of the rotation control can be increased. wear.
[0063]
(2) The brake control is set only by whether the counter value is “7” or less or “8” or more, and it is not necessary to set the brake time separately. Therefore, the rotation control means 50 has a simple configuration. It is possible to reduce the component cost and the manufacturing cost, and to provide an electronically controlled mechanical watch at a low cost.
[0064]
(3) Since the timing at which the upcount signal is input changes according to the rotational speed of the generator 20, the period during which the counter value is “8”, that is, the time during which the brake is applied, can be automatically adjusted. it can. For this reason, particularly in a locked state in which the up-count signal and the down-count signal are alternately input, stable control with high responsiveness can be performed.
[0065]
(4) Since the up / down counter 54 is used as the counting means, the comparison (difference) of the respective count values can be automatically calculated simultaneously with the counting, and therefore the first and second counting means 54A, 54B. Are provided separately, and compared with the case where the comparison means 54C for comparing the count values is provided, the configuration can be simplified and the difference between the count values can be easily obtained.
[0066]
(5) Since the 4-bit up / down counter 54 is used, 16 count values can be counted. Therefore, when the up-count signal is continuously input, the input value can be accumulated and counted, and the set range, that is, the up-count signal and the down-count signal are continuously input to the counter value. In the range up to “15” or “0”, the accumulated error can be corrected. For this reason, even if the rotational speed of the generator 20 deviates greatly from the reference speed, it takes time until the locked state is reached. However, the accumulated error is reliably corrected and the rotational speed of the generator 20 is returned to the reference speed. In the long term, accurate hand movement can be maintained.
[0067]
(6) Since the start setting circuit 90 is provided so that the brake control is not performed when the generator 20 is started and the generator 20 is not braked, the charging of the capacitor 22 can be prioritized. The rotation control means 50 driven by the motor 22 can be driven quickly and stably, and the stability of the subsequent rotation control can be improved.
[0068]
  Next, the present inventionPresupposed second reference formWill be described with reference to FIG. The followingEach reference form, embodimentIn the abovereferenceConstituent parts that are the same as or similar to the embodiment will be given the same reference numerals, and description thereof will be omitted or simplified.
[0069]
  BookreferenceIn the embodiment, the line decoder 100 is provided on the output side of the up / down counter 54, and Y8 to Y15 outputs corresponding to the counter values “8” to “15” of the up / down counter 54 are input to the transistor 23B of the brake circuit 23. Brake control.
[0070]
In the line decoder 100, one selected output becomes L level and the other 15 outputs become H level. Therefore, by connecting the outputs Y8 to Y15 to the NAND gate 101, any one of these outputs can be obtained. When the output is selected, that is, when the counter value of the up / down counter 54 is “8” to “15”, an H level signal is output to the gate of the transistor 23B, and when the counter value is “7” or less. An L level signal is output.
[0071]
The outputs Y0 and Y15 of the line decoder 100 are input to the NAND gate 102 to which the output from the synchronization circuit 70 is input. Therefore, for example, when a plurality of up-count signals are input and the counter value is “15” and an L-level signal is output from Y15, even if the up-count signal is input to the NAND gate 102, the input Is set so that no more up count signals are input to the up / down counter 54. Thus, the counter value is set so as not to exceed “15” and become “0”, or exceed “0” and become “15”. In the present embodiment, the initial value of the up / down counter 54 is set to the counter value “8”.
[0072]
In this embodiment as well, the same effects as (1) to (6) of the first embodiment can be obtained, and the following effects can also be obtained.
[0073]
(7) Since the line decoder 100 is provided so that the outputs Y0 to Y15 corresponding to the counter values “0” to “15” can be obtained, and the Y0 and Y15 outputs are returned to the NAND gate 102, the up-count signal Even if the down count signal continues, the counter value can be prevented from exceeding “15” to “0” or exceeding “0” to “15”, and the accumulated error becomes very large. In this case, it is possible to accurately grasp whether the error is the advance direction or the delay direction, and it is possible to surely eliminate erroneous control.
[0074]
  Next, the present inventionofAn embodiment will be described with reference to FIGS. In the present embodiment, as shown also in FIG. 11, the brake circuit 120 including the rectifier circuit 105 is provided in the generator 20. Specifically, the brake circuit 120 is configured by switches 121 and 122 that short-circuit the MG1 and MG2 that are output terminals of the generator 20 and apply a short brake. In the present embodiment, the switches 121 and 122 are composed of Pch transistors.
[0075]
In addition, the voltage doubler rectifier circuit 105 is configured by the capacitor 123, the diodes 124 and 125, and the transistors 126 and 127 that are switching elements connected to the generator 20.
[0076]
  The brake circuit 120 includesreferenceSimilar to the embodiment, the rotation control means 50 is driven by the electric power supplied from the power supply circuit (capacitor) 22.
[0077]
The braking control circuit 55 includes a chopper signal generator 80 in addition to the up / down counter 54 and the synchronization circuit 70.
[0078]
The up count input and down count input of the up / down counter 54 are inputted with the rotation detection signal FG1 of the rotation detection circuit 53 and the reference signal fs from the frequency dividing circuit 52 via the synchronization circuit 70, respectively.
[0079]
  The up / down counter 54referenceLike the form, it is composed of a 4-bit counter. Of the four data input terminals (preset terminals) A to D of the up / down counter 54, the initial value (preset) of the up / down counter 54 is obtained by inputting an H level signal to the terminals A, B, and D. Value) is set to the counter value “11”.
[0080]
The up / down counter 54 does not accept the up / down input until the LOAD input, that is, the system reset signal SR becomes the L level. Therefore, as shown in FIG. 12, the count value of the up / down counter 54 is maintained at “11”. Is done.
[0081]
The up / down counter 54 has 4-bit outputs QA to QD. Therefore, if the counter value is “12” or more, both the output QC and QD of the third and fourth bits output H level signals, and if the counter value is “11” or less, the output of the third and fourth bits. At least one of QC and QD always outputs an L level signal.
[0082]
Therefore, the output LBS of the AND gate 110 to which the outputs QC and QD are input is an H level signal if the count value of the up / down counter 54 is “12” or more, and is L level if the counter value is “11” or less. Signal. The output LBS is connected to the chopper signal generator 80.
[0083]
The outputs of the NAND gate 111 and the OR gate 112 to which the outputs QA to QD are input are respectively input to the NAND gate 102 to which the output from the synchronization circuit 70 is input. Therefore, for example, when a plurality of up-count signals are input and the counter value reaches “15”, an L level signal is output from the NAND gate 111, and even if the up-count signal is input to the NAND gate 102, the input Is set so that no more up count signals are input to the up / down counter 54. Similarly, when the counter value becomes “0”, the L-level signal is output from the OR gate 112, so the input of the down-count signal is cancelled. As a result, as in the second embodiment, the counter value is set so as not to exceed “15” to become “0” or to exceed “0” to become “15”.
[0084]
The chopper signal generator 80 includes three AND gates 82 to 84. The first chopper signal generator 81 outputs the first chopper signal CH1 using the outputs Q5 to Q8 of the frequency divider 52, and 2 A second chopper signal generating means 85 configured to output the second chopper signal CH2 using the outputs Q5 to Q8 of the frequency dividing circuit 52, and an output LBS from the up / down counter 54. And an AND gate 88 to which the output CH2 of the second chopper signal generating means 85 is input, and a NOR gate 89 to which the output of the AND gate 88 and the output CH1 of the first chopper signal generating means 81 are input. I have.
[0085]
The output CH3 from the NOR gate 89 of the chopper signal generator 80 is input to the gates of switches 121 and 122 made of Pch transistors. Therefore, when the L level signal is output from the output CH3, the switches 121 and 122 are maintained in the ON state, the generator 20 is short-circuited, and the brake is applied.
[0086]
On the other hand, when the H level signal is output from the output CH3, the switches 121 and 122 are maintained in the OFF state, and the generator 20 is not braked. Accordingly, the generator 20 can be chopper-controlled by the chopper signal from the output CH3.
[0087]
Next, the operation in this embodiment will be described with reference to the timing charts and output waveform diagrams of FIGS. 12 to 14 and the flowchart of FIG.
[0088]
When the generator 20 starts to operate and an L-level system reset signal SR is input from the initialization circuit 91 to the LOAD input of the up / down counter 54 (S11), based on the rotation detection signal FG1 as shown in FIG. The upcount signal and the downcount signal based on the reference signal fs are counted by the up / down counter 54 (S12). These signals are set so as not to be simultaneously input to the counter 54 by the synchronization circuit 70.
[0089]
Therefore, when the up-count signal is input from the state where the initial count value is set to “11”, the counter value becomes “12”, the output LBS becomes the H level signal, and the AND gate of the chopper signal generation unit 80. 88 is output.
[0090]
On the other hand, when the downcount signal is input and the counter value returns to “11”, the output LBS becomes an L level signal.
[0091]
As shown in FIG. 13, the chopper signal generation unit 80 uses the outputs Q <b> 5 to Q <b> 8 of the frequency dividing circuit 52 to output the output CH <b> 1 from the first chopper signal generation unit 81 and output from the second chopper signal generation unit 85. CH2 is output.
[0092]
When the L level signal is output from the output LBS of the up / down counter 54 (count value “11” or less), the output from the AND gate 88 is also an L level signal. CH3 is a chopper signal obtained by inverting the output CH1, that is, a chopper signal having a small duty ratio (ratio of turning on the switches 121 and 122) having a long H level signal (brake off time) and a short L level signal (brake on time). It becomes. Therefore, the brake-on time in the reference period is shortened, and the generator 20 is hardly braked, that is, brake-off control is performed with priority on the generated power (S13, S15).
[0093]
On the other hand, when the H level signal is output from the output LBS of the up / down counter 54 (count value “12” or more), the output from the AND gate 88 is also an H level signal. CH3 is a chopper signal obtained by inverting the output CH2, that is, a chopper signal having a large duty ratio with a long L level signal (brake on time) and a short H level signal (brake off time). Therefore, the brake-on time in the reference cycle becomes long, and the brake-on control is performed for the generator 20, but the choppering control is performed because the brake is turned off at a constant cycle, and the decrease in the generated power is suppressed. In addition, the braking torque can be improved (S13, 14).
[0094]
Then, when the torque of the mainspring 1a is large and the rotational speed of the generator 20 is high, the up-count signal may be further input after the counter value becomes “12” by the up-count signal. In this case, the counter value is “13”, and the output LBS maintains the H level. Therefore, the brake-on control is performed in which the brake is applied while the brake is turned off at a constant period by the chopper signal CH3. When the brake is applied, the rotational speed of the generator 20 decreases, and if the reference signal fs (down count signal) is input twice before the rotation detection signal FG1 is input, the counter value is “ 12 ”and“ 11 ”, and when it becomes“ 11 ”, the brake is switched to the brake-off control in which the brake is released.
[0095]
When such control is performed, the generator 20 becomes close to the set rotation speed, and as shown in FIG. 12, the up-count signal and the down-count signal are alternately input, and the counter value is “12”. And “11” are repeated. At this time, the brake is repeatedly turned on and off according to the counter value. That is, a chopper signal having a large duty ratio and a chopper signal having a small duty ratio are applied to the switches 121 and 122 during one period of the reference period in which the rotor rotates once, and choppering control is performed.
[0096]
Further, when the mainspring 1a is unwound and its torque is reduced, the time for applying the brake gradually decreases, and the rotational speed of the generator 20 becomes close to the reference speed even when the brake is not applied.
[0097]
Then, even if the brake is not applied at all, a large number of down count values are input. When the count value becomes a small value of “10” or less, it is determined that the torque of the mainspring 1a has decreased, and the hand movement is stopped. The user is encouraged to wind up the mainspring 1a again by making the speed very low, or by sounding a buzzer, a lamp or the like.
[0098]
Therefore, while the H level signal is output from the output LBS of the up / down counter 54, the brake-on control is performed by the chopper signal having a large duty ratio, and while the L level signal is output from the output LBS, the duty ratio is increased. Brake off control is performed by a small chopper signal. That is, the brake-on control and the brake-off control are switched by the up / down counter 54 which is a braking control means.
[0099]
In this embodiment, when the output LBS is an L level signal, the chopper signal CH3 is an H level period: L level period is 15: 1, that is, the duty ratio is 1/16 = 0.0625, and the output LBS is at the H level. In the case of a signal, the chopper signal CH3 is a chopper signal having an H level period: L level period of 1:15, that is, a duty ratio of 15/16 = 0.9375.
[0100]
Then, from MG1 and MG2 of the generator 20, as shown in FIG. 14, an AC waveform corresponding to a change in magnetic flux is output. At this time, a chopper signal CH3 having a constant frequency and a different duty ratio is appropriately applied to the switches 121 and 122 according to the signal of the output LBS, and when the output LBS outputs an H level signal, that is, during brake-on control, The short brake time in the chopper cycle becomes longer, the brake amount increases, and the generator 20 is decelerated. And since the amount of power generation is reduced as much as the brake is applied, the energy stored during this short brake can be output when the switches 121 and 122 are turned off by the chopper signal, so that the chopper can be boosted. Therefore, the braking torque can be increased while suppressing the decrease in the generated power.
[0101]
On the other hand, when the output LBS outputs an L level signal, that is, during brake-off control, the short brake time in each chopper cycle is shortened and the brake amount is reduced, and the generator 20 is accelerated. Also in this case, since the chopper can be boosted when the switches 121 and 122 are turned off from on by the chopper signal, the generated power can be improved as compared with the case where the control is performed without applying the brake at all.
[0102]
The AC output from the generator 20 is boosted and rectified by the voltage doubler rectifier circuit 105 and charged in the power supply circuit (capacitor) 22, and the rotation control means 50 is driven by the power supply circuit 22.
[0103]
Since the output LBS of the up / down counter 54 and the chopper signal CH3 both use the outputs Q5 to Q8 and Q12 of the frequency dividing circuit 52, that is, the frequency of the chopper signal CH3 is an integral multiple of the frequency of the output LBS. Therefore, the change in the output level of the output LBS, that is, the switching timing between the brake-on control and the brake-off control, and the chopper signal CH3 are generated in synchronization.
[0104]
In this embodiment as well, the same effects as (1) to (5) and (7) of the above-described embodiments can be obtained, and the following effects can also be obtained.
[0105]
(8) Furthermore, the brake is applied when the count value of the up / down counter 54 is in the range of 4 counts of “12” or more, ie, “12 to 15”, and 12 counts of “11” or less, ie, “11 to 0”. Since the control is performed so that the brake is not applied when it is within the minute range, in other words, each counter value of the up / down counter 54 is narrower than the range where the brake is not applied. The accumulated compensation range when the rotation cycle is delayed from the reference cycle can be widened, and the accumulated error that is likely to occur when the brake is not applied can be reliably corrected to return the rotation speed of the generator 20 to the reference speed. it can.
[0106]
That is, when the counter value is “12” or more, since the torque of the mainspring 1a is large, there is little possibility that the up-count signal is input due to temporary factors such as mechanical fluctuations and the brake is applied. The up-count signal is hardly input continuously by 3 to 4 or more. Therefore, even if the counter value range for applying the brake is set to a narrow range corresponding to four, the control can be reliably performed. On the other hand, when the brakes are not applied, the torque of the mainspring 1a is reduced, so the downcount value is continuously input due to temporary factors such as mechanical fluctuations or impact on the watch. There is a possibility that.
[0107]
At this time, in this embodiment, since the count value for 12 counts is set in a range where the brake is not applied, even when the down count value is continuously input, the accumulated amount is stored and the accumulated error amount is calculated. It can be corrected reliably.
[0108]
(9) Since the brake on / off control is performed using two types of chopper signals CH3 having different duty ratios, the brake (braking torque) is increased without reducing the charging voltage (generated voltage). be able to. In particular, since the control is performed using a chopper signal with a large duty ratio when the brake is on, the braking torque can be increased while suppressing a decrease in charging voltage, and the brake control is efficient while maintaining the stability of the system. It can be performed. Thereby, the duration of the electronically controlled mechanical timepiece can also be increased.
[0109]
(10) Further, since the chopper is controlled by the chopper signal having a small duty ratio even during the brake-off control, the charging voltage while the brake is off can be further improved.
[0110]
(11) Since the output level change of the output QD, that is, the switching timing of the on / off control of the brake and the change timing of the chopper signal CH3 from on to off are synchronized, it corresponds to the chopper signal CH3 of the generator 20 An output portion (beard portion) having a high electromotive voltage can be output at regular intervals, and this output can also be used as a rate measuring pulse of the watch.
[0111]
That is, when the output LBS and the chopper signal CH3 are not synchronized with each other, a portion with a high electromotive voltage is generated from the generator 20 even when the output LBS changes, in addition to the chopper signal CH3 having a fixed period. For this reason, the “beard portion” in the output waveform of the generator 20 is not necessarily output at a constant interval and cannot be used as a rate measurement pulse. However, if it is synchronized as in this embodiment, it can also be used as a rate measurement pulse. Can be used.
[0112]
It should be noted that the present invention is not limited to each embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.
[0113]
For example, although the 4-bit up / down counter 54 is used as the counting means in the embodiment, an up / down counter of 3 bits or less may be used, or an up / down counter of 5 bits or more may be used. If an up / down counter having a large number of bits is used, the number of values that can be counted increases, so that the range in which the accumulated error can be stored can be increased. On the other hand, if a counter with a small number of bits is used, the range in which the accumulated error can be stored becomes small. However, when the lock state is entered, the up and down operations are repeated. There is an advantage that can be reduced.
[0114]
Further, the specific counter value has “8” or “12” as a boundary, but is not limited thereto, and the brake may be applied at “11” to “15”. Preferably, the range of the counter value for applying the brake should be narrower than the range of the counter value for not applying the brake. However, depending on the setting of the clock, the range of the counter value to apply the brake may be equal to the range of the counter value to not apply the brake, or the range where the brake is not applied (brake off) may be wider. .
[0115]
Further, it is preferable that the range of the counter value to be braked includes the maximum or minimum counter value (for example, “15” or “0”). If such values are included, a brake control signal can be easily formed using the outputs QA to QD of the up / down counter 54, and the configuration of the braking control means can be simplified.
[0116]
Further, the counting means is not limited to the up / down counter, and the first and second counting means may be individually provided for the reference signal fs and the rotation detection signal FG1, respectively. However, in this case, a comparison means (comparison circuit) for comparing the count values of the respective counting means must be provided separately, and using the up / down counter 54 has an advantage that the circuit configuration is simplified.
[0117]
Furthermore, the start setting circuit 90 is not necessarily provided, but it is preferable to provide the start setting circuit 90 in that the rotation control means 50 can be driven quickly by giving priority to power generation when the generator 20 is started. The specific configuration of the activation setting circuit 90 is not limited to the above embodiment.
[0118]
  The first and secondreferenceAlso in formThe aboveSimilarly to the embodiment, choppering control may be performed in which a chopper pulse is added to the brake signal applied to the transistor 23B and the transistor 23B is repeatedly turned on and off. By performing such choppering control, there is an advantage that the brake torque can be increased while the generated power is kept above a certain level.
[0119]
【The invention's effect】
As described above, according to the electronically controlled mechanical timepiece and the control method thereof of the present invention, the speed control response is fast and the cost can be reduced.
[Brief description of the drawings]
FIG. 1 of the present inventionFirst reference of premiseIt is a top view which shows the principal part of the electronically controlled mechanical timepiece in a form.
FIG. 2 is a cross-sectional view showing a main part of FIG.
3 is a cross-sectional view showing a main part of FIG. 1;
FIG. 4referenceIt is a block diagram which shows the structure of a form.
FIG. 5referenceIt is a circuit diagram which shows the structure of a form.
FIG. 6reference6 is a timing chart in the circuit of the embodiment.
FIG. 7reference6 is a timing chart in the circuit of the embodiment.
FIG. 8reference6 is a timing chart in the circuit of the embodiment.
FIG. 9referenceIt is a flowchart which shows the control method of a form.
FIG. 10 shows the present invention.Assumption 2nd referenceIt is a circuit diagram which shows the structure of a form.
FIG. 11 shows the present invention.ofIt is a circuit diagram which shows the structure of embodiment.
FIG.Of the present inventionIt is a timing chart in the circuit of an embodiment.
FIG. 13Of the present inventionIt is a timing chart in the circuit of an embodiment.
FIG. 14Of the present inventionIt is a timing chart in the circuit of an embodiment.
FIG. 15Of the present inventionIt is a flowchart which shows the control method of embodiment.

Claims (7)

A mechanical energy source, a generator driven by the mechanical energy source coupled via a train wheel to generate induced power to supply electrical energy, a pointer coupled to the train wheel, and In an electronically controlled mechanical timepiece comprising rotation control means that is driven by electrical energy to control the rotation cycle of the generator, and switching means that can short-circuit both ends of the generator .
The rotation control means includes
Rotation detection means for detecting a rotation period of the generator and outputting a rotation detection signal corresponding to the rotation period;
A reference signal generating means for generating a reference signal based on a signal from a time standard source;
First counting means for counting reference signals from the reference signal generating means;
Second counting means for counting a rotation detection signal from the rotation detection means;
A plurality count range plurality of count values that can be counted by the positive and negative sides, respectively with respect to a preset count value, said first counter means a count value of said second counting means based The count value of the difference from the count value is obtained, it is determined whether the count value of the difference is on the plus side or the minus side, and if it is on the plus side, a brake on signal is output and the minus value is output. A comparison means for outputting a brake-off signal when it is on the side ,
Chopper signal generating means for outputting a chopper signal having a large duty ratio with a large ratio of brake on time based on the brake on signal and a chopper signal having a small duty ratio with a small ratio of brake on time based on the brake off signal; , And
The chopper signal with the large duty ratio or the chopper signal with the small duty ratio output from the chopper signal generating means is applied to the switching means, and the switching means conducts only for the brake-on time, thereby causing the generator to An electronically controlled mechanical timepiece which performs a choppering operation in which both ends are short-circuited, the generator is braked, and ON / OFF is repeated based on the duty ratio .   2. The electronically controlled mechanical timepiece according to claim 1, wherein the first counting means, the second counting means, and the comparing means are constituted by an up / down counter. 3. The electronically controlled mechanical timepiece according to claim 1, wherein when the electric energy from the generator is supplied for the first time, the rotation control means drives the generator by a predetermined number of revolutions. An electronically controlled mechanical timepiece configured to maintain the generator in a non-braking state until activated. In electronically controlled mechanical timepiece according to claim 2, when the up-down counter which is supplied with electrical energy from the generator for the first time, sets the up-down counter ± 1 within the set count value An electronically controlled mechanical timepiece characterized by being configured to do so. In electronically controlled mechanical timepiece according to claim 2, wherein the up-down counter, the range of count values which control is performed for braking among the plurality of count values, the count value is not braked An electronically controlled mechanical timepiece that is narrower than the range. A mechanical energy source, a generator driven by the mechanical energy source coupled via a train wheel to generate induced power to supply electrical energy, a pointer coupled to the train wheel, and In a control method of an electronically controlled mechanical timepiece comprising rotation control means that is driven by electrical energy to control a rotation cycle of the generator, and switching means that can short-circuit both ends of the generator .
A reference signal generated based on a signal from a time standard source is counted to obtain a first count value, and a rotation detection signal output corresponding to the rotation period of the generator is counted to obtain a second count value. Seeking
Obtains a count value of a difference between the first count value said second count value as a reference in a plurality of count value countable state positive and negative sides, respectively with respect to a preset count value, the Judge whether the difference count value is on the plus side or minus side, and if it is on the plus side, output a brake-on signal, and if it is on the minus side, output a brake-off signal. ,
A large duty ratio chopper signal with a large ratio of brake on time based on the brake on signal and a small duty ratio chopper signal with a small ratio of brake on time based on the brake off signal,
The chopper signal with the large duty ratio or the chopper signal with the small duty ratio is applied to the switching means, and the switching means conducts only for the brake-on time, so that both ends of the generator are short-circuited to brake the generator. And performing a choppering operation of repeatedly turning on and off based on the duty ratio . A mechanical energy source, a generator driven by the mechanical energy source coupled via a train wheel to generate induced power to supply electrical energy, a pointer coupled to the train wheel, and In a control method of an electronically controlled mechanical timepiece comprising rotation control means that is driven by electrical energy to control a rotation cycle of the generator, and switching means that can short-circuit both ends of the generator .
A reference signal generated based on a signal from a time standard source is used as a down-count signal, and a rotation detection signal output corresponding to the rotation cycle of the generator is input as an up -count signal to an up / down counter and is preset. counting the count value of the up-down counter plurality of count values in countable state in the positive and negative sides, respectively with respect to the set count value, the count value is the positive or negative side of the up-down counter The brake-on signal is output when it is on the positive side, and the brake-off signal is output when it is on the negative side, or
The reference signal is used as an up-count signal, the rotation detection signal is input as a down-count signal to an up / down counter, and a plurality of count values can be counted on each of a plus side and a minus side with respect to a preset set count value. The count value of the up / down counter is counted in the state, it is determined whether the count value of the up / down counter is on the plus side or the minus side, and if it is on the minus side, a brake on signal is output. If it is on the plus side, it outputs a brake off signal,
A large duty ratio chopper signal with a large ratio of brake on time based on the brake on signal and a small duty ratio chopper signal with a small ratio of brake on time based on the brake off signal,
The chopper signal with the large duty ratio or the chopper signal with the small duty ratio is applied to the switching means, and the switching means conducts only for the brake-on time, so that both ends of the generator are short-circuited to brake the generator. And performing a choppering operation of repeatedly turning on and off based on the duty ratio .

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