JPS5854897A - Driving device for pulse motor - Google Patents

Abstract

PURPOSE:To decrease the number of signal cables, and to reduce cost by transmitting signals having different pulse width by means of the same signal wire, discriminating signals in response to pulse width at the receiving circuit section side and driving and controlling the pulse motor. CONSTITUTION:The receiving circuit section 11 containing a pulse motor driving circuit and a pulse signal generating section 12 are connected by a transmission cable 13, and the transmission cable 13 is formed by the signal wire 14 and a common wire 15. The pulse signal generating circuit 12 is formed by a fundametnal pulse generator 16 and signal generators 17, 18 generating up signals and down signals, periods thereof are the same and pulse width thereof differs, on the basis of fundamental pulses from the fundamental pulse generator 16. The receiving circuit section 11 discrimates pulses received in response to pulse width, and outputs the up signals and the down signals. Accordingly, the pulse motor is driven.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pulse motor drive device that can be remotely controlled.

Conventionally, in order to drive a pulse motor located in a remote location, a receiving circuit section 1 including a pulse motor drive circuit and a pulse signal generator 2 are connected through a transmission cable as shown in FIG. is sent from the pulse signal generating circuit 2 to the receiving circuit section 1, and this transmission cable is connected to the up signal line 4. It consists of a down signal line 5 and a common line 6, and the up switch 7 is turned on when sending a hairline signal to the receiving circuit section 1, and the down switch 8 is turned on when sending a down signal.

This kind of conventional pulse motor drive device uses 6 cables.
I had to carry the books, and the cables were expensive, so I didn't have to carry them! ir, l: There was a drawback that the whole was expensive.

An object of the present invention is to eliminate the drawbacks of the above-mentioned conventional devices.

To provide an inexpensive pulse motor drive device that uses fewer cables.

In order to achieve the above object, the pulse motor drive device of the present invention generates an up signal and a down signal with different pulse widths in a pulse signal generation circuit, and transmits these signals to a receiving circuit section using the same 1-wire transmission cable. The up signal and down signal are identified according to the width of the pulse sent by the receiving circuit.

The present invention will be described in detail below with reference to embodiments shown in the drawings.

FIG. 2 is a connection diagram of a pulse motor drive device which is an embodiment of the present invention. Further, FIG. 6 is a circuit block diagram showing details of the receiving circuit section of the embodiment device shown in FIG. 2, and FIG. 5 shows signal waveforms of each part of the embodiment device shown in FIGS. .

In FIG. 2, the receiving circuit section 11 including the pulse motor drive circuit and the pulse signal generating circuit 12 are connected to the transmission case 7'')v13.
The transmission cape (v13) is composed of a signal line 14 and a common line 15.

Further, the pulse signal generation circuit 12 includes a basic pulse generator 16,
The up signal generator 17 is composed of signal generators 17 and 18 that generate up signals and down signals having the same period and different pulse widths, that is, duties, based on the basic pulses from the basic pulse generator 12. The output of the down signal generator 18 is connected to the signal line 14 via the up switch 19, and the output of the down signal generator 18 is connected to the signal line 14 via the down switch 20.

The receiving circuit section 11 has input terminals IN to which the signal line 14 is connected and COM to which the common line 15 is connected, and the receiving circuit section 11 is configured as shown in FIG. In other words, the input terminal IN is connected to the capacitor 22 via the amplifier 21.
The capacitor 22 is connected to a one-shot multi-circuit 24 via an amplifier 23, and is also grounded via a resistor 25. Capacitor 22 is amplifier 2
A differentiating circuit 26 is constituted by the 3° resistor 25.

The output terminal of the one-shot multi-circuit 24 is connected to one input terminal of the exclusive OR circuit 27 and also to the CK terminal of the flip-flop circuit 28 . The output terminal of the amplifier 21 is further connected to the other input terminal of the exclusive OR circuit 27 and to the D terminal of the flip-flop circuit 28. Furthermore, the output terminal of the OR circuit 27 is an AND circuit 29. It is connected to one end of the input of the AND circuit 60, the Q output terminal of the flip-flop circuit 28 is connected to the other end of the input of the AND circuit 290, and the Q output terminal is connected to the other end of the input of the AND circuit 3Q. .

? ! The clock pulse from the clock pulse generator 61 is connected so as to be applied to one end of the other inputs of the AND circuit 29 and the AND circuit 30. The AND circuit 29 derives a clock signal to operate the pulse motor up, and the AND circuit 30 derives a clock signal to operate the pulse motor down.
It is configured to be added to.

Next, the operation of the apparatuses shown in FIGS. 2 and 3, which are connected and configured as described above, will be explained.

The up signal generator 17 of the pulse signal generation circuit 12 generates the up signal shown in FIG. On the other hand, the down signal generator 18 generates the down signal shown in FIG. 5(b). This down signal is a signal having a pulse width T2 smaller than /2.

When either the up switch 19 or the down switch 20 is pressed, an up signal from the up signal generator 17 or a down signal from the down signal generator 18 is sent to the input terminal IN of the receiving circuit section 11 via the signal line 14. added to. This input signal is then applied to the differentiating circuit 26 via the amplifier 21 and rises! Ill is differentiated. Regardless of whether an up input signal or a down input signal is input, the output signal of the differentiating circuit 26 is as shown in FIG. i,l'S5 (C). Next, this differential signal (e) is applied to the one-shot multi-circuit 24.

One-shot multi-circuit 24 is set. Since this set output is set to last for /2 of the period T, its signal waveform is as shown in FIG. is triggered.

Now, for example, if we consider the case where the up switch 17 is pressed, the up signal
This signal is applied to the other input end of the OR circuit 27 and also to the 1) terminal of the flip-flop circuit 28. Up believe! %'(al is at a high level at the point where the output of the one-shot multi-circuit 24 falls, that is, at the midpoint of the pulse period T, so the flip-flop circuit 28 is set.The Q terminal waveform of the flip-flop circuit 28 is the fifth The result is as shown in Figure (g).Also, since the output of the one-shot multi-circuit 24 is added to one end of the input of the exclusive-OR circuit 27, the exclusive-OR circuit 27 receives the up signal (a) and the one-shot multi-circuit The exclusive OR of the 24 outputs is taken.Since the exclusive OR can be taken for a certain period (TI-/2) after the midpoint of the period T, the output of the exclusive OR circuit 27 is shown in Figure 5 +8). This is the signal that indicates.

Next, the Q output of the flip-flop circuit 28, the output (e) of the exclusive OR circuit 27, and the output peak of the clock pulse generator 31 are added to the input of the AND circuit 29, so the output of the AND circuit 29 is as shown in FIG. ) is the signal shown. This output signal is applied to the pulse motor drive circuit 32 to cause the pulse motor to operate up. Note that while the up signal (a) is continuously applied to the input terminal IN, the flip-flop circuit 28 is maintained in the set state. Therefore, since the Q output is low level, AND circuit 3
No output, ie, a down operation signal, is derived at 0.

Instead of up switch 17, now down switch 18
When is pressed, a down signal (b) is derived from the output of the amplifier 21, and this signal is applied to the D terminal of the flip-flop circuit 2 and the other end of the input of the IJ1 and other OR circuit 27. At the center point of the period T when the flip-flop circuit 28 is triggered, the down signal (b) is at a low level, so the flip-flop circuit 28 is in a reset state and Q
The output terminal is as shown in FIG. 5 (1+). Conversely, the Q output terminal becomes high level. The exclusive OR circuit 27 also receives the down signal (b) and the output Fd of the one-shot multi-circuit 24.
), the exclusive OR can be obtained for a certain period (T2 to T2) before the midpoint of the period T, and the output of the exclusive OR circuit 27 is the signal shown in FIG. Next, the Q output of the flip-flop circuit 28, the output of the exclusive OR circuit 27 (), and the output of the clock pulse generator 31 (
Since summer) is added to the input of the AND circuit 30, the output of the AND circuit 30 becomes the signal shown in FIG. let

While the down signal (b) is continuously applied to the input terminal IN, the flip-flop circuit 28 is maintained in a reset state, so the Q output is at a low level and the AND circuit 29
No output, ie, up operation signal, is derived.

As described above, while the up switch or the down switch is pressed, a certain amount of up operation signal and down operation signal can be obtained intermittently.

FIG. 4 is a connection diagram of a pulse motor drive device showing another embodiment of the present invention. In Fig. 4.

The receiving circuit section 41 and the pulse signal generator 42 are coupled by an optical fiber cape (v43).

The up signal from the up signal generator 47 flows through the up switch 49, or the down signal from the down signal generator 48 flows through the down switch 50 to the light emitting diode 51, which generates pulsed light according to the pulse width of the up signal or down signal. is transmitted using an optical fiber cape (optical fiber cape) V43, which is received by a phototransistor 52, converts the pulsed light into an electrical signal, and then a circuit 5 similar to the circuit shown in FIG.
3, an up operation signal or a down operation signal is obtained depending on the pulse reflex width. According to this example, only 1
Remote control signals can be sent through the book's optical fiber.

In the above embodiment, we have explained the case where the up signal and down signal generated by the pulse generator have a constant pulse width. The pulse motor may be controlled in accordance with the pulse width. An example is shown in FIG.

A signal transmission system similar to that shown in FIG. 4 is used. In the figure, when the manual analog voltage EH and the feedback voltage Ef are E i = E, the pulse width signal converter 62
derives a pulse width signal with a duty ratio of 1/2, but E
i) When E rO, it is converted into a signal with a dog pulse width, and when Ei (El, it is converted into a signal with a small pulse width) and sent to the receiving circuit section 6 via the optical fiber cable 63.
1, a pulse width signal corresponding to the deviation voltage of the analog signal is sent to control the position of the pulse motor proportional to the analog signal.

As described above, according to the pulse motor drive device of the present invention, the pulse signal generator side generates signals with different pulse widths, these are transmitted through the same signal line, and the receiving circuit side identifies the signals according to the pulse widths. This is because it performs drive control of the pulse motor.

The number of signal line cables can be reduced compared to the conventional one, and an inexpensive pulse motor drive device can be obtained.

[Brief explanation of drawings]

Fig. 1 is a connection diagram showing a conventional pulse motor drive device, Fig. 2 is a connection diagram of a pulse motor drive device showing an embodiment of the present invention, and Fig. 6 is a receiving circuit of the embodiment device shown in Fig. FIG. 4 is a connection diagram of a pulse motor drive device showing another embodiment of the present invention, and FIG. 5 explains the operation of the embodiment device shown in FIGS. 2 and 5. No signal waveform diagram. Fig. 6 is a schematic diagram of a pulse motor drive device showing an example of use of the present invention. 11, 41, 61: Receiving circuit section, 12, 42: Pulse signal generation circuit, 13: Transmission cable 14: Signal line, 15: Common line, 16/46: Basic pulse signal generator, 17/47: Up signal generator,
18/48: Down signal generator, 19/49 Near turn switch. 20/50: Down Nuitchi, 24: One shot 1
-Multi times 1 Raku, 26:% 1 minute circuit. 27: Exclusive OR circuit, 28: Flip-flop circuit, 29/60: AND circuit. 31: Clock signal generator, 32: Pulse smoke drive circuit, 43/66: Optical fiber cable,
51/71: Light emitting diode, 52/72: Phototransducer. 62: Pulse width signal converter. Patent applicant Shimadzu Corporation Representative Patent attorney Shigeru Nakamura

Claims (3)

[Claims] (1) A receiving circuit section including a pulse motor drive circuit. A circuit that generates a signal for instructing the pulse motor drive circuit to perform an up operation or a signal for instructing a down operation, and a transmission line that transmits an up signal or a down signal from the signal generation circuit to the receiving circuit section. In Toyoshi's pulse motor drive device. The signal generating circuit is a circuit that generates up signals and down signals with different pulse widths, and these up signals and down signals are transmitted through the same transmission line, and the receiving circuit section generates up signals and down signals with different pulse widths. What is claimed is: 1. A pulse motor driving device comprising: a circuit for receiving and identifying the two signals, and driving a pulse motor using an up signal or a down signal identified according to a pulse width. (2) The transmission line is comprised of two wires: a signal cable for transmitting up or down signals having different pulse widths, and a common cable.
The pulse motor drive device described in . (3) The pulse motor drive device according to claim 1, wherein the transmission line is a single optical fiber cable, and optical pulses having different pulse widths are carried on this optical fiber cable.