JPH05187889A - Battery-operation type encoder - Google Patents

Abstract

PURPOSE:To reduce the BAT power consumption when an industrial machine, etc., stop and further improve rotation response characteristics. CONSTITUTION:A time-series signal generator 12 repeats ON/OFF of a switch 14 with a signal r as a pulse train signal when a predetermined time passes after the rotating operation stops, thus enabling a BAT power supply to be intermittently fed to a sensor 1, amplifiers 2 and 3, comparators 4 and 5, and a counting accumulation circuit 13 for reducing current consumption. Also, an operation displacement detector 11 detects the rotating operation start at the time of stop by inputting output signals of comparators 4 and 5 and retains a switch 14 to be ON when starting rotating operation.

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 industrial machines and the like.

[0002]

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

The sensor 1 detects the amount of position change from the rotational operation of a battery-operated encoder associated with the operation of an industrial machine or the like, and outputs signals a and b to amplifiers 2 and 3, respectively. The amplifiers 2 and 3 amplify the signals a and b into signals c and d, which are output to the comparators 4 and 5, respectively. The comparator 4 performs a comparison process on the basis of the signal c, and then outputs a signal e to the counting circuit 6 and the driver circuit 7. The comparator 5 performs comparison processing based on the signal d, and then outputs the signal f to the counting circuit 6 and the driver circuit 7 as in the case of the comparator 4.

The counting circuit 6 includes a processing circuit such as a quadrupling circuit, performs counting and accumulation based on the input signals e and f, and outputs processing result data to the data processing circuit 8.
The data processing circuit 8 carries out processing based on the sent 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.

Each constituent element of the above-mentioned encoder has a normal power source Vcc as shown in FIG.
Current is supplied from the diode 9a. Further, when the industrial machine stops, the normal power supply Vcc also stops, but in this case, the BAT power supply shown in the figure is applied, and the sensor 1, the amplifiers 2, 3 and the comparator 4, Current is supplied to the counter circuit 5 and the counter circuit 6 from the BAT power source through the diode 9b. The normal power source Vcc and the BAT power source are grounded via capacitors 10a and 10b, respectively.

As described above, by applying the BAT power source while the industrial machine is stopped, the position fluctuation value is counted and accumulated in the counting circuit 6 even when the industrial machine restarts its operation. .. Then, when the power supply Vcc is supplied next time, the data processing circuit 8 causes the counting circuit 6 to operate.
The data is processed based on the output value of and the signal p is output. The signal p is output to the outside as a signal q via the driver circuit 7 by serial data transmission or the like. As a result, accurate position detection can be performed even when the industrial machine or the like starts to operate again.

[0007]

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

However, in the above-mentioned conventional method, the current is always supplied from the BAT power source when the industrial machine or the like is stopped due to the stop of the power source. Therefore, the sensor 1, the amplifiers 2, 3 and The respective signals a, b, c, d, e, f output from the comparators 4, 5
Are the potentials Va, Vb, Vc, Vd, V as shown in FIG.
Holds e and Vf. Therefore, the sensor 1, the amplifiers 2 and 3, and the comparators 4 and 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 it is possible to reduce the consumption of the BAT power source when the industrial machine or the like is stopped, and to improve the rotational response characteristic by detecting the start of the rotational movement. An object is to provide a battery-operated encoder.

[0010]

SUMMARY OF THE INVENTION A battery operated encoder according to the present invention is intermittent with respect to a component that consumes a large amount of current in the battery operated encoder when a predetermined time elapses after the rotational movement of the shaft is stopped. Means for performing a constant current supply, a detection means for detecting the start of the rotational movement of the shaft, and a means for switching the intermittent current supply to a continuous current supply when the start of the rotational movement is detected by the detection means. It is characterized by doing.

[0011]

In the encoder, the power supply lines to the sensors, amplifiers, comparators, etc., which are the components of large current consumption in the encoder, are interrupted, and the power supply to the above components is interrupted to intermittently operate the above components. To operate. Therefore, the current consumption is intermittent and the average current consumption can be suppressed low.

Further, the operation displacement detector is used to detect the occurrence of an operation from the operation signal during the intermittent operation time of the constituent elements, and the time series signal generator is controlled. As a result, when a position change operation occurs in the encoder, the BAT current steady supply state is immediately switched 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, controls the time-series signal generator to generate an intermittent signal, and the energy-saving operation starts.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The configuration of the battery-operated encoder according to the present invention is shown in FIG.

The sensor 1 detects the amount of position change from the rotational operation of the battery-operated encoder associated with the operation of the industrial machine and outputs signals a and b to the amplifiers 2 and 3, respectively. The amplifiers 2 and 3 amplify the signals a and b into signals c and d, which are output to the comparators 4 and 5, respectively. The comparator 4 performs comparison processing based on the signal c, and then outputs the signal e to the driver circuit 7 and the motion displacement detector 11. The comparator 5 performs comparison processing based on the signal d, and then outputs the signal f to the driver circuit 7 and the motion displacement detector 11 in the same manner as the comparator 4.

A time series signal i is input from the time series signal generator 12 to the motion displacement detector 11. As a result, the motion displacement detector 11 reproduces the waveforms of the signals e and f into the signals g and h, and outputs them to the counting and accumulating circuit 13.
Furthermore, the motion displacement detector 11 generates a motion displacement generation signal j from the signals e and f, and the time series signal generator 1
Output to 2.

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

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

FIG. 2 shows an example of the structure of the above-mentioned motion displacement detector 11. The operation displacement detector 11 includes D flip-flops 15a and 15b, two-input EX-OR circuits 16a and 16
b, resistors 17a and 17b, capacitors 18a and 18b,
It is composed of an OR circuit 19.

Two D flip-flops 15a, 15
A time series signal i is commonly sent to b 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.
Further, 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 above-mentioned signal q to the outside of the movement displacement detector 11 and also has a 2-input E.
It is output to the X-OR circuit 16a. This 2-input EX-OR
A delay circuit is formed by a resistor 17a and a capacitor 18a at one input terminal of the circuit 16a.

The D flip-flop 15b outputs the signal h to the outside of the movement displacement detector 11 and also has a 2-input E.
It is 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 the resistor 17b and the capacitor 18b.

The 2-input EX-OR circuits 16a and 16b.
Is output to the 2-input EX-OR circuit 19 and is ORed.
After being calculated, the signal j is output to the outside of the movement displacement detector 11.

In the above-mentioned FIG. 1, each component described above is supplied with current from the normal power source Vcc through the diode 9a when the industrial machine is operating, but the normal power source Vcc is interrupted due to the stop of the industrial machine. When it does, it switches to the BAT power supply. This allows the diode from the BAT power supply to
A current is supplied via b, and operation is performed by the BAT power supply. A power supply line A shown in the figure supplies power to the sensor 1, the amplifiers 2 and 3, the comparators 4 and 5, the counting and accumulating circuit 13, and the operating displacement detector 11 and the time-series signal generator 12, which are not particularly shown. It is connected to the terminal VDD. The normal power supply Vcc and the BAT power supply are capacitors 10a and 1 respectively.
It is grounded through 0b. 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 is a switch 1
4, the signal r, which is a pulse train as shown in FIG. 3 during stop, is output to periodically perform ON / OFF operation. As a result, the potential at the point B becomes a continuous pulse waveform as shown in the waveform of the B potential in the figure being stopped. 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 the operating state, the waveforms of the respective output signals a, b, c, d, e, f are
The waveform becomes the waveform shown in FIG.

The time-series signal i output from the time-series signal generator 12 to the motion displacement detector 11 is the signal a, b from the rising edge of the signal r as shown by the signal in the stopped state in FIG. , C, d, e, f rise with a delay of time t until they stabilize, and the output signals e, f of the comparators 4, 5 input to the motion displacement detector 11 are sampled at this rise. The time series signal i, the signals e and f have the cycle t0. Since the position of the detection target does not change during the battery operation, that is, during the stop of the industrial machine operation, there is no change in the states of the signals e and f, and the signals g and h output from the operation displacement detector 11 shown in FIG. Shows a waveform with no change as shown during the stop in FIG. Next, the rotation operation of the detection target starts and the time when the encoder starts the operation 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 becomes a low level, which is sampled by the operation displacement detector 11 at the timing of the signal i. Therefore, the output signal h of the motion displacement detector 11 shifts from the high level to the low level, and this shift state is differentiated at the time of displacement and the signal j is output.

According to the signal j, the time series signal generator 12 sets the signal r output to the switch 14 to a low level and shortens the cycle of the time series signal i to correspond to the high speed signals e and f. .. Switch 1 by the above signal r
4 is turned on, and the sensor 1, the amplifiers 2 and 3 and the comparators 4 and 5 are constantly in the operating state. After that, while the signal j is generated, the signal i becomes a pulse train signal having a period t1 and the operation displacement detector 11 performs high-speed sampling. Next, a case where the encoder is in a rotating operation and then stopped is described with reference to FIG.

While the encoder is rotating, a pulse is generated in the operation displacement generation signal j according to the rotation speed as shown in FIG. However, at the time of stopping the operation, 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.

The time-series signal generator 12 operates as shown in the same figure, when a predetermined constant time T elapses after the last pulse A generated in the signal j is generated during the rotation operation. At the same time that the control signal r is generated, the pulse interval of the signal i which is a sampling signal is set to t0. As a result, it is possible to suppress the current consumption while the operation is stopped. With the above operation, it is possible to reduce the current consumption of the encoder during the operation of the BAT power supply, and further improve the rotation response characteristic during the energy saving operation.

[0030]

As described above in detail, according to the present invention,
It is possible to save energy in the BAT power supply by intermittently supplying a current to the sensor 1, the amplifiers 2 and 3, and the comparators 4 and 5 that consume a large amount of current in the components of the encoder during operation of the BAT power supply. did. Furthermore, the rotational displacement of the encoder is detected by the operation displacement detector 11 at a predetermined timing, and when the rotational movement of the encoder is detected by this, the rotation response is changed by switching from intermittent supply to continuous supply of the BAT power source. The characteristics can be improved.

In addition, when the operation of the encoder is stopped during the operation of the BAT power supply, when a predetermined time elapses after the operation is stopped, the intermittent power supply state as described above is restored, so that a stable energy saving system is realized. it can.

[Brief description of drawings]

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

FIG. 2 is a block diagram showing an example of a configuration of a motion displacement detector according to the same embodiment.

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

FIG. 4 is a timing chart when the battery-operated encoder in the embodiment shifts from a rotation operation state to a stop 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]

1 ... Sensor, 2, 3 ... Amplifier, 4, 5 ... Comparator, 7 ... Driver circuit, 8 ... Data processing circuit, 9a, 9b ... Diode, 10a, 10b ... Capacitor, 11 ... Operating displacement detector, 12 ... Sequence signal generator, 13 ... Count storage circuit,
14 ... switch.

Claims (1)

[Claims] 1. A battery-operated encoder for detecting a rotational position of a shaft, wherein an intermittent operation is performed on a component having a large current consumption in the battery-operated encoder when a predetermined time elapses after the rotational movement of the shaft is stopped. Means for supplying various currents, detecting means for detecting the start of the rotational movement of the shaft, and means for switching the intermittent current supply to the continuous current supply when the start of the rotational movement is detected by the detecting means. A battery-operated encoder characterized by the following.