JPS5868684A - Dial type electronic time piece - Google Patents

Abstract

PURPOSE:To secure the normal stepping of hands by chopper amplification of an induced current in a coil of a step motor at a specified time to detect any halt of a rotor. CONSTITUTION:When a drive pulse with a specified width is applied to a coil 27 through switching elements 15-17, a step motor turns. After the application of the drive pulse, an induced current in the coil 27 is detected with chopper amplification resistance elements 23 and 24 before a detedting pulse is applied corresponding to the stop position of a rotor through rotor turning resistance elements 25 and 26. With the generation of an opposite current, any halt of the rotor can be detected accurately. In this case, as a correction correction pulse is applied, the rotor stops at the normal stable point thereby always securing the normal stepping of hands.

Description

[Detailed Description of the Invention] This letter is concerned with reducing the power consumption of an analog slave clock, and specifically recommends that a step motor be used immediately to determine the position of the rotor. The switching method that changes the pulse width to the load is designed to reduce power consumption by always driving with the optimum pulse width.

Conventionally, the analog gauges used in motor vehicles consume more gauges than necessary to maintain the safety of normal rotational drive of the motor at a high I (i.e., when feeding the calendar or under low temperature conditions). It is necessary to always supply a drive pulse with sufficient width for cases such as the above), and this has been a major hindrance to reducing the power consumption of analog electronic clocks.

As a means to solve this problem, the step motor is usually driven with a short pulse width in the conventional method, and when the rotor is rotated kL7, the drive pulse is the same width as the previous one, or at least an even narrower pulse width is supplied. However, a method for driving the step motor with a pulse width equal to fcitL according to the load condition of the bag and the output torque condition of the motor will be considered and discussed. The most important point in realizing driving with such an optimum pulse width is to determine whether or not the rotor has rotated. Conventionally, no method has been proposed for determining the position of the rotor due to this rotation-non-1 rotation foot. In this method, the QO shown in Fig. 1 is applied, and the transient vibration of the rotor due to this drive pulse ends, and the rotor stops.
7, the position of the rotor is determined by detection pulse 2, and if the rotor is not at the desired position, correction pulse 3 is issued to ensure normal hand movement.

As for this method of determining the position of the rotor, if the rotor is now in the same position as shown in Figure 2, when the coil is excited by the drive pulse, a magnetic flux 8 due to the magnetic flux will be generated as shown in the figure. . At this time, if the driving pulse is sufficiently vertical, the rotor will rotate 180 degrees and take the position as shown in Figure 3-1. All 3rd
When a detection pulse is issued to determine the position of the rotor in the state shown in Figure 1-, the magnetic flux (■) generated by this detection pulse is generated by the rotor magnet 4 near the outer notch 7-CL#7-6. Since the magnetic fluxes 9-a and 9-b are directed in the direction Y8, the magnetic resistance is small, the inductance of the coil is very high, and the detection pulse Kx shows a gentle rise. On the other hand, if the drive pulse is insufficient and the rotor does not rotate and is at a position near the outer notch 1b1 of FIG. b, and the direction of the $ bundle 12 due to the detection pulse is determined by the magnetic resistance (, therefore, the coil intufftance is small (). Therefore, the flow due to the detection pulse is Indicates upper n.

11. The position of the machined rotor is determined by determining the difference in the rise of this detected W flow. Therefore, it is possible to determine whether the rotor rotates once or not.

However, in the well-known pulse width side control, the minimum pulse necessary to turn the 1 Euro rotor by 1 turn is always supplied, so the rotor position is at the 3rd position due to the width of the drive pulse. In addition to the state shown in Fig. 1 (zl j or tbr), the state shown in Fig. 4 may also occur. α, 6-
It is in a state where it is stopped facing the direction where b is connected. (This #l phenomenon will be referred to as fli + stop in the middle of the edge.) Since there is no stable point at this point, if there is a mechanical vibration, magnetic disturbance, etc., it will immediately reach one of the stable points. It is assumed that the construction will fall, but if there is no external disturbance, h
Even two tubes stop at this neutral point. If a detection pulse is issued at t19 in this state, the magnetic fluxes 13-α and 13-b generated from the rotor magnets will be the same and negative as the magnetic flux 14 caused by the detection pulses in the vicinity of 1,000h. C
The cane lol! 4, Fig. 3 [It is magnetically similar to the case where the rotor αl rotates. Therefore, the electrolung according to the detection nozzle ζ: xK shows a gentle rise, and it is determined that the rotor has rotated. If it is determined that the rotor has rotated, the next driving pulse with the opposite polarity will be issued 111 seconds after no correction pulse is issued, causing the rotor to return to its original position. With the next detection pulse, the rotation is added again, and the clock ends up being 2 seconds behind.The fact that the displayed time is behind the regular time setting means that the stacking is absolutely zero!
This is a fatal flaw in quartz watches.

In addition, the more the number of kurusutari (prepared in advance in the Rusu-Kanka II), the more the burden on the transport line increases due to changes over time, etc. The more the temperature -i becomes lower (the more the viscosity of the lubricating oil becomes fil), the higher the probability of occurrence (n5).
Become.

The present invention eliminates such conventional drawbacks and determines whether the rotor is rotating (01 or not) while ensuring absolute reliability of hand operation.
This is intended to contribute to lower power consumption of step motors. Specifically, after the drive pulse is applied and before the detection pulse is applied, the chopper amplifies the induced voltage and detects the occurrence of 0 and 1 intermediate stop, and detects the occurrence of the rotor (b). This aims to ensure uniformity in the conversion ratio.

The present invention will be explained below with reference to the drawings.

Each shaded area in FIG. 5 shows the waveform of the current generated by the induced voltage of the rotor after the drive pulse mark 7'Ja. Acid 1 diagram Cα1 is 1 when the rotor rotates normally.
1frr waveform is shown, 161 is the current waveform when the rotor is not making a single rotation, and lcl is the tI51r waveform when the rotor stops in the middle. From this point forward, no induced current in the positive direction is generated during the intermediate period of 1 h. The present invention attempts to eliminate this problem by detecting the occurrence of an intermediate stop.

FIG. 6 shows an example of the configuration of a drive circuit according to the present invention. 15, 16, 17, 18, 19, 20,
21 and 22 are switching elements, 15 and 16
, 19, K, 21, 22 are P channel yoah
Transistor C (abbreviated as P-MO8), 17, 1
8 power lJ channel MOB) transistor (hereinafter N-M
(abbreviated as O8), VDD indicates the source potential of P-MO8, and VsgijN-MO8 tour-x potential. Z3.2
4tff is the resistance element for increasing the width of the chopper (about 2ooxn t), and 5.26 is the resistance element for detecting rotor rotation (
It is about 20Ω (#). In addition, 27 indicates a coil, and O
Both shoulders of the I1-ro snow lamp coil are shown.

FIG. 7 is a timing chart showing one embodiment of the present invention, and (! e b # e e d * # a f
#g* Each signal of A is P-MO in FIG.
8, shows the gate signal of N-MOs. Please come to the same figure 28
29 indicates a driving pulse, and 29 indicates a detection pulse. Also, 32#
31 is the core part of the present invention, in which the above-mentioned induced 1h range is widened by a chopper, and the section for detecting the middle t%i II: (hereinafter referred to as the middle m1 stop detection interval) is a correction pulse, and this correction pulse is used when it is determined that the rotor is in a non-center rotation by modifying the start pulse. Intermediate stop''! This message is issued when the occurrence of 1 case is detected in the detection period. The drive pulse 28 is prepared in advance and is output with a pulse width expected to be most suitable based on the load condition and output torque condition of the motor from among several pulse widths. Now, if the C drive 1 pulse lJ is sufficient to rotate the rotor, the rotor Ff rotates 80 degrees and moves normally as shown in Figure 8. It shows the angular #displacement from the old stable point, and 0 = 00 is still the old stable point,
θ=180' is another static stable point, and θ=':K)' is the neutral point (intermediate stop point) which is a problem in the present invention. In the case of the same figure, medium ri, +h block detection section 34
In order to detect OiE electromotive current in the same direction by increasing the chopper width, confirm that there is no intermediate stop.
Further, since the detection pulse 35 determines that the rotor is rotating, only the correction pulse 36 is not output. 8g9 diagram is
In contrast to FIG. 8, a case is shown in which the width of the drive pulse is insufficient to rotate the rotor. In this case, an intermediate stop occurs in the intermediate stop detection section tone, and r fk
However, the detection pulse 35 outputs a correction pulse to determine that the rotor is not rotating. This correction pulse is set to produce sufficient output torque, so the rotor always rotates II = 180°
to ensure normal hand movement. Fig. 1θ shows a so-called intermediate stop state in which the output torque by the drive pulse and the load torque of the wheel train are exactly balanced and the rotor stops at a neutral point of 1 to 6 == 99'.

If an intermediate stop occurs in this L, the present invention provides an intermediate stop detection interval tone after the shore drive pulse, so the occurrence of an intermediate stop is detected and a correction pulse is output to maintain normal hand movement. It will be done. A flowchart of the above trajectory is shown in FIG.

As stated above, the present invention has the advantage of providing an intermediate stop interval after applying a driving pulse, and detects the occurrence of an intermediate stop, which conventionally causes a delay in hand movement. It is important to ensure the reliability of the hand movement.

1k, because the width of the square induced current is increased using the tsubo yotsuba width, there is no need to worry about an increase in the consumption. Furthermore, intermediate stop 1n
Since the occurrence of the pulse width can be completely grasped, the drive pulser 11 can be set to any value, and the optimum pulse width can be controlled according to the load. As described above, the applicability of the present invention to an analog double-column clock is extremely high (and the necessity is high).

Figure 1 shows the ILA dynamic waveform of a conventional step motor with a pulse center impeller cage. Figures 2, 3, and 4 are diagrams of the operation of the step motor. Figure 5 shows the waveform of the induced current in the rotor. FIG. 6 is an example of a circuit configuration for implementing the present invention. FIG. 7 is a timing chart showing one embodiment of the present invention. Figures 8, 9, and 10 show the angle of the rotor and the tJ of the coil.
The figure which shows the 1 pressure waveform of J710. FIG. 11 #-j is a flowchart showing an embodiment of the invention.

1-・Drive pulse. 2-・Detection pulse. 3. Replacement correction pulse. 41. Rotor. 51. Star. 6-α, 6-6
...Inside. 7-α, 7-b... Outer notch. 86.
Magnetic flux due to drive pulse. 9-α19-b・Magnetic flux due to rotor magnet. 10...Magnetic flux due to detection pulse. 11-α
. 11-b...Magnetic flux due to rotor magnet, 1211-Magnetic flux due to detection pulse. 13-α, 13-6...Magnetic flux depending on the way the rotor comes out. 14...Magnetic flux due to detection pulse. 15,
16 , 17 , 18 , 19 , 20 , 21 , 22
Working/switching element, 23.24-・Resistance cord for increase in power. 25.26-・Also resistance element for rotor rotation detection.

n...Coil. 28@・lTh pulse. 4...Detection pulse. J...Correction pulse, 31...Intermediate stop detection section 1
'M1.32--Rotor position judgment section I0a... Drive pulse. 34--Intermediate stop detection section, ah, fighting detection pulse. ;36...Correction pulse.

Graduation 2nd figure 3 military prisoners Notebook 4 464 Figure 6 7th father 8 illustrations ne9 again +1! , lo ward Figure 11 -46:

Claims (1)

[Claims] 1. In an analog electronic clock in which the width of the drive pulse f Ill m is determined by modifying the 411 pulses to determine whether the rotor is rotating or not rotating, An analog electronic clock characterized in that it detects all occurrences of intermediate stops of the rotor by widening the 1' flow pipe induced before application of a detection pulse. 2. Detects intermediate stops. In this case, the analog electronic time of the first burial mound distribution is characterized in that the pulse 1r for the correction of the intermediate stop 1 is added 1 and the correction 1 is performed.