JP3040570B2 - Battery operated encoder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery-operated encoder applied to position detection of an industrial machine or the like.

[0002]

2. Description of the Related Art The configuration of a conventional battery operated encoder is shown in FIG.

The sensor 1 detects a position change amount from a rotation operation of a battery-operated encoder accompanying an operation of an industrial machine or the like, and outputs signals a and b to the amplifiers 2 and 3, respectively. The amplifiers 2 and 3 amplify the signals a and b to output the signals c and d to the comparators 4 and 5, respectively. After performing the comparison process based on the signal c, the comparator 4 outputs the signal e to the counting circuit 6 and the driver circuit 7. After performing the comparison processing based on the signal d, the comparator 5 outputs the signal f to the counting circuit 6 and the driver circuit 7 in the same manner as the comparator 4.

The counting circuit 6 includes a processing circuit such as a quadruple circuit, counts and accumulates based on input signals e and f, and outputs processing result data to a data processing circuit 8.
The data processing circuit 8 performs processing based on the transmitted data, and outputs an output signal p to the driver circuit 7. The driver circuit 7 outputs signals m, n, and q to the outside corresponding to the input signals e, f, and p, respectively.

[0005] Each component of the encoder described above has a normal power supply Vcc as shown in FIG.
The current is supplied through the diode 9a. When the industrial machine is stopped, the normal power supply Vcc is also stopped. In this case, the BAT power supply shown in the figure is applied, and the sensor 1, the amplifiers 2, 3, the comparator 4, A current is supplied from a BAT power supply to the counter 5 and the counting circuit 6 via a diode 9b. The normal power supply Vcc and the BAT power supply are grounded via capacitors 10a and 10b, respectively.

As described above, by applying the BAT power supply while the industrial machine is stopped, the position fluctuation value is counted and stored in the counting circuit 6 even when the operation of the industrial machine is started again from the stopped state. . Then, when the power supply Vcc is supplied next time, the data processing circuit 8 sets the counting circuit 6
, And outputs a signal p. The signal p is output to the outside as a signal q via the driver circuit 7 by serial data transmission or the like. This enables accurate position detection even when the industrial machine or the like starts operating again.

[0007]

In an industrial machine or the like to which the above-mentioned battery operated encoder is mounted, the machine is often not operated when the machine is stopped with a power stop.

However, in the above-mentioned conventional method, the current is always supplied from the BAT power supply when the machine is stopped with the power supply of the industrial machine or the like stopped. Therefore, the sensor 1, the amplifiers 2, 3 and The signals a, b, c, d, e, and f output from the comparators 4 and 5, respectively.
Are the potentials Va, Vb, Vc, Vd, and V as shown in FIG.
e and Vf are held. For this reason, the sensor 1, the amplifiers 2, 3 and the comparators 4, 5 always consume power. Further, since the response frequency of the battery-operated encoder is generally as fast as about 100 KHz, the current consumption of the sensor 1, the amplifiers 2, 3 and the comparators 4, 5 is large.

The present invention has been made in view of the above circumstances, and can reduce the consumption of the BAT power supply when a machine such as an industrial machine is stopped, and can improve the rotational response characteristics by detecting the start of the rotational movement. It is an object to provide a battery operated encoder.

[0010]

SUMMARY OF THE INVENTION A battery-operated encoder according to the present invention intermittently intermittently replaces components of the battery-operated encoder which consume a large amount of current when a predetermined time elapses after the rotation of the shaft is stopped. Means for supplying a constant current, detecting means for detecting the start of the rotational movement of the shaft, and means for switching the intermittent current supply to continuous current supply when the start of the rotational movement is detected by the detecting means. It is characterized by doing.

[0011]

The power supply lines to sensors, amplifiers, comparators, etc., which are components of the encoder which consume a large amount of current, are intermittently connected and the power supply to the above components is intermittently intermittently performed. Make it work. Therefore, current consumption is intermittent and the average current consumption can be suppressed low.

In addition, from the operation signal during the intermittent operation time of the constituent element, the occurrence of the operation is detected using the operation displacement detector, and the time-series signal generator is controlled. Thus, when a position change operation occurs in the encoder, the state is immediately switched to the BAT current steady supply state so that the encoder can respond to the high-speed response state. Further, the operation displacement detector detects that the displacement of the encoder does not occur within a predetermined time, and controls the time-series signal generator to generate an intermittent signal, thereby starting the energy saving operation.

[0013]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a battery-operated encoder according to the present invention.

The sensor 1 detects a position change amount from a rotation operation of a battery operated encoder accompanying operation of an industrial machine or the like, and outputs signals a and b to the amplifiers 2 and 3, respectively. The amplifiers 2 and 3 amplify the signals a and b to output the signals c and d to the comparators 4 and 5, respectively. The comparator 4 outputs a signal e to the driver circuit 7 and the motion displacement detector 11 after performing a comparison process based on the signal c. After performing the comparison process based on the signal d, the comparator 5 outputs the signal f to the driver circuit 7 and the motion displacement detector 11 in the same manner as the comparator 4.

The motion displacement detector 11 receives a time-series signal i from a time-series signal generator 12. Thereby, the motion displacement detector 11 reproduces the waveforms of the signals e and f as signals g and h, and outputs them to the count accumulation circuit 13.
Further, the motion displacement detector 11 generates a motion displacement generation signal j from the signals e and f, and generates the motion displacement signal j.
Output to 2.

The count accumulation circuit 13 includes a processing circuit such as a quadruple circuit, and performs count accumulation according to the signals g and h. When power is supplied again from the power supply Vcc, the data processing circuit 8 performs processing according to the data counted and stored by the count storage circuit 13 and outputs a signal p to the driver circuit 7. The driver circuit 7 outputs the signals p, e, f
Signals q, m, and n are output to the outside corresponding to each signal.

The time-series signal generator 12 outputs a time-series signal i to the operation displacement detector 11 and a signal r to the switch 14 in accordance with the operation displacement generation signal j. OFF control is performed. One terminal of the switch 14 is connected to the GND terminal VSS of the sensor 1, the amplifiers 2, 3 and the comparators 4, 5 via a point B, and the other terminal is connected to GND.

FIG. 2 shows a configuration example of the operation displacement detector 11. The operation displacement detector 11 includes D flip-flops 15a and 15b and two-input EX-OR circuits 16a and 16b.
b, resistors 17a and 17b, capacitors 18a and 18b,
An OR circuit 19 is provided.

Two D flip-flops 15a, 15
b, a time-series signal i is commonly sent as a clock signal. The D flip-flop 15a outputs the signal q at the timing of the time-series signal i according to the signal e.
The D flip-flop 15b outputs the signal h at the timing of the time series signal i according to the signal f.

The D flip-flop 15a outputs the signal q to the outside of the motion displacement detector 11 and has two inputs E
Output to the X-OR circuit 16a. This 2-input EX-OR
A delay circuit is formed at one input terminal of the circuit 16a by a resistor 17a and a capacitor 18a.

The D flip-flop 15b outputs the signal h to the outside of the motion displacement detector 11 and has two inputs E.
Output to the X-OR circuit 16b. This 2-input EX-OR
A delay circuit is formed at one input terminal of the circuit 16b by a resistor 17b and a capacitor 18b.

The two-input EX-OR circuits 16a and 16b
Is input to a two-input EX-OR circuit 19 and
After the calculation, it is output to the outside of the motion displacement detector 11 as a signal j.

In FIG. 1, current is supplied from the normal power supply Vcc via the diode 9a during the operation of the industrial machine or the like, but the normal power supply Vcc is cut off when the industrial machine is stopped. When it does, it switches to the BAT power supply. As a result, the diode 9 can be switched from the BAT power supply.
A current is supplied via the terminal b, and the operation is performed by the BAT power supply. The power supply line A shown in FIG. 1 supplies power to the sensor 1, the amplifiers 2 and 3, the comparators 4 and 5, the count accumulation circuit 13, and the power supply of the operation displacement detector 11 and the time-series signal generator 12 (not shown). Connected to terminal VDD. The normal power supply Vcc and the BAT power supply are capacitors 10a, 1 respectively.
0b is grounded. Next, the operation of the above embodiment will be described with reference to FIGS. First, the energy saving operation during operation by the BAT power supply will be described.

The time series signal generator 12 includes a switch 1
4, a signal r which is a pulse train as shown during the stop of FIG. 3 is output, and the ON / OFF operation is performed periodically. As a result, the potential at the point B becomes a continuous pulse waveform as shown in the waveform during the stop of the potential B in FIG. As shown in the figure, when the switch 14 is ON, the point B is connected to GND and becomes 0V. At this time, since the sensor 1, the amplifiers 2, 3 and the comparators 4, 5 are in operation, the waveforms of the respective output signals a, b, c, d, e, f are
The waveform during the stop is shown in FIG.

The time-series signal i output from the time-series signal generator 12 to the motion displacement detector 11 is composed of the signals a and b from the rise of the signal r as shown by the stopped signal in FIG. , C, d, e, and f rise with a delay of time t until the signal stabilizes, and the output signals e and f of the comparators 4 and 5 input to the motion displacement detector 11 are sampled at the rise. The time series signal i, the signals e and f have a period t0. During operation of the battery, that is, during stoppage of the operation of the industrial machine, there is usually no change in the position of the detection target, so that there is no change in the state of the signals e and f, and the signals g and h output from the operation displacement detector 11 shown in FIG. Is a waveform having no change as shown during the stop in FIG. Next, a case where the rotation operation of the detection target starts and the operation of the encoder starts will be described with reference to the waveform after the start of the rotation operation in FIG.

In the case of the encoder shown in FIG. 1, when the operation starts, the output signal f of the comparator 5 goes low, and this is sampled by the operation displacement detector 11 at the timing of the signal i. Therefore, the output signal h of the operation displacement detector 11 transits from the high level to the low level, and this transposition state is differentiated at the time of the displacement, and the signal j is output.

The time-series signal generator 12 sets the signal r output to the switch 14 to a low level according to the signal j and shortens the cycle of the time-series signal i to correspond to the high-speed signals e and f. . The switch 1 is generated by the signal r.
4 is turned on, and the sensor 1, the amplifiers 2, 3 and the comparators 4, 5 are constantly operated. Thereafter, while the signal j is generated, the signal i becomes a pulse train signal having a period t1, and the high-speed sampling is performed in the motion displacement detector 11. Next, a case where the operation of the encoder stops during the rotation operation will be described with reference to FIG.

During the rotation of the encoder, a pulse is generated in the operation displacement generation signal j in accordance with the rotation speed as shown in FIG. However, when the operation is stopped, the signals a, b, c, d, e, and f maintain the state at that time, so that no pulse is generated in the signal j after the operation is stopped.

As shown in the figure, the time-series signal generator 12 switches the switch 14 when a predetermined time T elapses after the last pulse A generated in the signal j during the rotation operation. At the same time as generating the control signal r, the pulse interval of the signal i, which is a sampling signal, is set to t0. As a result, current consumption during operation stoppage can be suppressed low. With the above operation, it is possible to reduce the current consumption during the operation of the BAT power supply of the encoder, and to further improve the rotational response characteristic during the energy saving operation.

[0030]

As described in detail above, according to the present invention,
During operation of the BAT power supply, it is possible to save energy of the BAT power supply by intermittently supplying currents supplied to the sensor 1, the amplifiers 2, 3 and the comparators 4, 5 which consume a large amount of current in the components of the encoder. did. Further, the rotational movement of the encoder is detected by the operation displacement detector 11 at a predetermined timing. When the rotational movement of the encoder is detected by this operation, the BAT power is switched from intermittent supply to continuous supply to provide a rotational response. The characteristics can be improved.

Further, if the operation of the encoder is stopped during the operation of the BAT power supply, the operation returns to the above-mentioned intermittent power supply state after a predetermined time elapses after the stop, thereby realizing a stable energy saving system. it can.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a battery operated encoder according to one embodiment of the present invention.

FIG. 2 is a block diagram showing an example of a configuration of an operation displacement detector in the embodiment.

FIG. 3 is a timing chart when the battery operated encoder in the embodiment shifts from a stopped state to a rotating operation state.

FIG. 4 is a timing chart when the battery operated encoder in the embodiment shifts from a rotating operation state to a stopped state.

FIG. 5 is a block diagram showing a configuration of a conventional battery operated encoder.

FIG. 6 is a timing chart showing the operation of a conventional battery-operated encoder.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Sensor, 2,3 ... Amplifier, 4,5 ... Comparator, 7 ... Driver circuit, 8 ... Data processing circuit, 9a, 9b ... Diode, 10a, 10b ... Capacitor, 11 ... Operation displacement detector, 12 ... Time Sequence signal generator, 13 ... Count accumulation circuit,
14 ... Switch.

Claims (1)

(57) [Claims] 1. A battery-operated encoder for detecting a rotational position of a shaft, wherein when a predetermined time elapses after the rotational movement of the shaft is stopped, the components of the battery-operated encoder which consume a large amount of current are intermittently operated. Means for supplying an appropriate current, detecting means for detecting the start of the rotational movement of the shaft, and means for switching the intermittent current supply to continuous current supply when the start of the rotational movement is detected by the detecting means. A battery operated encoder characterized by the above-mentioned.