JPH0731629Y2 - Electronic counter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field to which the Invention belongs] The present invention is connected to any one of two signal circuits having different voltages for counting and resetting, and is common to two signal circuits having different voltages. The present invention relates to an electronic counter having a counting photo coupler and a reset photo coupler used.

[Conventional technology]

It is convenient for an electronic counter to be able to count signal circuits of various voltages. As an example of a conventional electronic counter that counts by connecting either one of two count signal circuits having different voltages, the one shown in FIGS. 3 and 4 is known.

In FIG. 3, the electronic counter has two power supply terminals 1, 2,
Two counting terminals 3 and 4, two reset terminals 5 and 6, a common terminal 7, a counting photocoupler 8 common to two counting signal circuits with different voltages, and a reset photocoupler common to two reset signal circuits with different voltages 9, power supply circuit 10, counting circuit 11
And so on. The power supply circuit 10 supplies stable DC power to the counting circuit 11 by rectification, smoothing and constant voltage operation, and is driven by a commercial AC power supply 12 connected to power supply terminals 1 and 2. Both photocouplers 8 and 9 apply the input signal to the counting circuit 11 in an insulated state. Between one input end of the photocoupler 8 and the counting terminal 3, a series circuit of two resistors 13 and 14 is connected.
The connection point of the resistors 13 and 14 is connected to the counting terminal 4.
A series circuit of two resistors 15 and 16 is connected between one input end of the photocoupler 9 and the reset terminal 5, and both resistors 15 and 16 are connected in series.
Is connected to the reset terminal 6. The other input ends of the respective photocouplers 8 and 9 are commonly connected to the common terminal 7. The phototransistor of the photocoupler 8 is a counting circuit 11 via two resistors 17 and 18 and a capacitor 19.
Further, the phototransistor of the photocoupler 9 is connected to the counting circuit 11 via the two resistors 20, 21 and the capacitor 22, respectively. When the phototransistor of the photocoupler 8 is turned on, the counting circuit 11 performs counting, The counting circuit 11 is reset by turning on the phototransistor. FIG. 3 shows a circuit in which this electronic counter is driven by an AC power source 12, for example, a contact circuit of an electromagnetic relay or an electromagnetic contactor is connected to count as a counting signal. A count signal contact 23 is connected between the two to form a count signal circuit, and the power supply terminal 1 and the reset terminal 5 are connected.
A reset signal contact 24 is connected between the two and to form a reset signal circuit. In this case, the common terminal 7
Are connected to the power supply terminal 2.

Now, when the counting signal contact 23 is closed, a closed circuit of the power source 12-counting signal contact 23-counting terminal 3-resistors 13, 14-input end of the photocoupler-8-common terminal 7-power source 12 is formed. here,
The resistors 13 and 14 connected in series suppress the current from the power source 12 and supply it to the photocoupler 8. The phototransistor of the photocoupler 8 is turned on by the current flowing through the closed circuit, and the signal is transmitted to the counting circuit 11. Similarly, when the reset signal contact 24 is closed, the power supply 12-reset signal contact 24-reset terminal 4-resistors 15, 16-photocoupler 9-common terminal 7
-A closed circuit of the power supply 12 is formed and resistors 15,1 connected in series
The current suppressed by 6 flows into the photocoupler 9, whereby the phototransistor of the photocoupler 9 is turned on and the signal is transmitted to the counting circuit 11. As described above, in the connection shown in FIG. 3, the counter circuit 11 counts the signals by the combination of the count signal from the commercial AC power source 12 and the reset signal.

FIG. 4 shows a connection for counting signals from a proximity switch or the like connected to a DC power source using the same electronic counter as in FIG. 3, and the power supply circuit 10 and the counting circuit 11 are shown in FIG. The illustration is omitted because it is the same as the above. Generally, a battery is used for the DC power supply that drives the proximity switch,
Since the voltage is lower than that of the commercial AC power supply 12, the signal supplied from the proximity switch is connected to the counting terminal 3 and the reset terminal 5 which are different from each other. That is, in FIG.
Output transistor 26a of proximity switch 26 driven by 25
Has its emitter connected to the + terminal of the power supply 25 and its collector connected to the resistor 14
It is connected to the counting terminal 4 connected to the photocoupler 8 via. Also, the output transistor 27 of the proximity switch 27
a has its emitter connected to the + terminal of power supply 25 and its collector connected to a resistor 1
It is connected to the reset terminal 6 connected to the photocoupler 9 via 6. When driven by a DC power supply whose voltage is lower than that of the commercial AC power supply 12, the two resistors 13,1 are used.
5 is omitted, and both photocouplers 8 and 9 are connected so that a current having substantially the same current value as in the case of the AC power supply 12 flows. The operation as the electronic counter shown in FIG. 4 is performed in the same manner as in the case shown in FIG. 3 by turning on and off both output transistors 26a and 27a, and therefore the description thereof is omitted.

[Problems to be solved by the device]

As described above, the conventional electronic counter has two different voltages.
In order to use the common counting photocoupler 8 and resetting photocoupler 9 for different types of signals, it is necessary to have high-voltage input terminals and low-voltage input terminals for each of the counting terminal and the reset terminal. There was a drawback that many connections could be mistaken. Further, the amount of heat generated by each of the resistors 13, 14, 15, 16 connected in series to the input side of the photocoupler becomes a problem. In particular, take signal input from AC power supply with high voltage,
When the counting signal and the reset signal are input at the same time, almost the same current flows through each of the resistors 13, 14, 15, and 16, so that the total amount of heat generated is large and the temperature rise inside the electronic counter becomes high.
There is a drawback that the deterioration of the electronic components is accelerated and the reliability is lowered.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the conventional device, arrange the signal input terminals, and gradually reduce the heat generation amount when two signals are input at the same time, and suppress the temperature rise inside the counter to improve reliability. To provide a high electronic counter.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides two power supply terminals to which a control power supply is connected, a count terminal to which a count signal circuit using this control power supply or a low voltage source lower than the control power supply is connected, For a control power source or a low voltage source having a reset terminal for connecting a reset signal circuit using a control power source or a low voltage source lower than the control power source as a power source, and one input terminal connected to the counting terminal via a counting resistor A common counting photocoupler, a resetting photocoupler common to the control power supply and the low voltage source, in which one input end is connected to the reset terminal through a reset resistor having a resistance value lower than that of the counting resistor, and the counting photocoupler. A common terminal to which the other input terminals of the photocoupler and the reset photocoupler are commonly connected, an intermediate terminal, and a connection between the intermediate terminal and the power supply terminal. When a counting signal circuit and a reset signal circuit having a control power source as the power source are connected to the counting terminal and the reset terminal, the common terminal and the intermediate terminal are connected, and the counting signal circuit having the low voltage source as the power source is provided. When the reset signal circuit is connected to the counting terminal and the reset terminal, the common terminal is connected to the low voltage source.

[Action]

In the electronic counter of the present invention, when the count signal and the reset signal are input to the counting circuit for counting, it is not necessary to input the count signal while the reset signal is input,
Each of the photocouplers is commonly connected to one of the input terminals of the respective photocouplers, and is commonly connected to a count resistor for flowing a count signal and a reset resistor for flowing a reset signal, and connected to one input end of each photocoupler. A common resistor is connected to the other input terminal of the counter, and this common resistor is connected in series with the counting resistor or the reset resistor to suppress the current flowing through the counting photocoupler and the reset photocoupler. Further, when the reset signal follows the counting signal, the current flowing through the reset resistor whose resistance value is lower than that of the counting resistor increases, and the current flowing through the counting resistor decreases to turn off the counting photocoupler. Even if currents simultaneously flow through the resistors, the currents flowing through the counting resistors are immediately turned off to suppress the heat generation, thereby reducing the amount of heat generated by the resistors as a whole.

〔Example〕

1 and 2 are views showing an embodiment of an electronic counter according to the present invention, in which the same parts as those shown in FIGS. 3 and 4 are designated by the same reference numerals.

In FIG. 1, the power supply terminals 1 and 2 are the same as the conventional ones, but the counting terminal 3 and the reset terminal 5 are each arranged as one. A counting resistor 14 is connected between the counting terminal 3 and one input end of the photocoupler 8, and has a resistance value lower than that of the counting resistor 14 between the reset terminal 5 and one input end of the photocoupler 9. The reset resistor 16 is connected. The other input ends of both photocouplers 8 and 9 are commonly connected to the common terminal 7 as usual, but this electronic counter is provided with an intermediate terminal 28, and is common between this intermediate terminal 28 and the power supply terminal 2. Resistor 29 is connected. Further, a capacitor 30 may be connected in parallel with the common resistor 29 as shown by a dotted line. The power supply circuit 10 is supplied with power from a commercial AC power supply 12 connected to the power supply terminals 1 and 2 as in the conventional one, and is connected so as to supply stable DC power to the counting circuit 11. Both photocouplers 8 and 9 insulate between the signal circuit and the counting circuit 11, and the counting circuit is turned on and off by the output transistor.
Connected to drive 11.

FIG. 1 shows the electronic counter connected so as to count the signals of the signal circuit driven by the AC power supply 12, and the counting signal contact 23 is connected between the power supply terminal 1 and the counting terminal 3 to count signals. A circuit is formed, and a reset signal contact 24 is connected between the power supply terminal 1 and the reset terminal 5 to form a reset signal circuit. The common terminal 7 is connected to the intermediate terminal 28, and the common resistor 29 is inserted in series in both photocouplers 8 and 9. As a result, the current flowing through the photocouplers 8 and 9 is suppressed by the series circuit of the counting resistor 14 or the reset resistor 16 and the common resistor 29.

Now, when the count signal contact 23 is closed, the AC power supply 12-count signal contact 23-count terminal 3-resistor 14-photocoupler 8-common terminal 7-intermediate terminal 28-common resistor 29-power supply terminal 2-AC power supply
A closed circuit 12 is formed, and a current suppressed in the photocoupler 8 flows by the counting resistor 14 and the common resistor 29 connected in series, the phototransistor of the photocoupler 8 is turned on, and a signal is transmitted to the counting circuit 11. When the reset signal contact 24 is closed, the AC power supply 12-reset signal contact 24-reset terminal 5
-Reset resistor 16-Photocoupler 9-Common terminal 7-Intermediate terminal 28-Common resistor 29-Power supply terminal 2-A closed circuit of the AC power supply 12 is formed, and the reset resistor 16 and the common resistor 29 are connected in series.
The current thus suppressed flows in the photocoupler 9, the phototransistor of the photocoupler 9 is turned on, and the signal is transmitted to the counting circuit 11. Of course, when the counting signal contact 23 is closed,
The resistance values of the resistors 14 and 29 are set so that the current flowing through the photocoupler 8 is sufficient to turn on the phototransistor of the photocoupler 8. However, when the reset signal contact 24 is closed after the count signal contact 23, the resistance value of the reset resistor 16 is set to be lower than the resistance value of the counting resistor 14, so that almost all the current flows to the input side of the photocoupler 8. Most of the generated current flows to the input side of the photocoupler 9. Therefore, the photo coupler 8 is turned off and the photo coupler 9 is turned on. Here, considering the heat generation amount of each resistor 14, 16, 29, when the counting signal contact 23 is closed, both resistors 14, 2
9 shows a large amount of heat generation, but when the reset signal contact 24 is closed after the counting signal contact 23, both resistors 16 and 29 show a large amount of heat generation, and both resistors 14 and 16 show a large amount of heat generation at the same time. As a result, the amount of heat generated by the resistance can be gradually reduced as a whole. When the signal power supply is an AC power supply, a capacitor is connected in parallel with the common resistor 29 as shown by the dotted line.
The resistance value of the common resistor 29 can be increased by connecting the common resistor 29, and the heat generation amount of the common resistor 29 can be reduced. Since the capacitor 30 does not consume power, the heat generation amount can be reduced as a whole.

FIG. 2 shows the connection when a signal is applied from a proximity switch or the like connected to a DC power source using the same electronic counter as in FIG. 1, and the power supply circuit 10 and the counting circuit 11 are the same as those in FIG. Therefore, it is omitted. In FIG. 2, for example, the output transistor 26a of the proximity switch 26 driven by the DC power supply 25 has its emitter connected to the + terminal of the DC power supply 25,
Its collector is connected to the counting terminal 3. The output transistor 27a of the proximity switch 27 has its emitter connected to the + terminal of the DC power supply 25 and its collector connected to the reset terminal 5. The common terminal 7 is directly connected to the negative terminal of the DC power supply 25, the common resistor 29 is omitted, and a current having substantially the same value as that in the case of FIG. 1 flows through both photocouplers 8 and 9. In the embodiment shown in FIG. 2, the operation as an electronic counter is almost the same as that shown in FIG. 1, but in FIG. 2 both terminals 3 and 7 or both terminals 5 and 7 are independently dc. Since the voltage of the power supply 25 is applied, even if the count signal and the reset signal are input at the same time, both photo couplers 8,
Both 9 photo transistors turn on. Since the reset resistor 16 has a smaller resistance value than the counting resistor 14, the current value becomes larger by that amount, but by setting the resistance values of both resistors 14 and 16 to appropriate values, signal input by an AC power source with a high voltage The heat generation can be suppressed more than in the case.

[Effect of device]

As described above, according to the present invention, two power supply terminals to which a control power supply is connected, a count terminal to which a count signal circuit that uses the control power supply or a low voltage source lower than the control power supply as a power supply is connected, For a control power source or a low voltage source having a reset terminal for connecting a reset signal circuit using a control power source or a low voltage source lower than the control power source as a power source, and one input terminal connected to the counting terminal via a counting resistor A common counting photocoupler, a resetting photocoupler common to the control power supply and the low voltage source, in which one input end is connected to the reset terminal through a reset resistor having a resistance value lower than that of the counting resistor, and the counting photocoupler. A common terminal to which the other input terminals of the photocoupler and the reset photocoupler are commonly connected, an intermediate terminal, and a connection between the intermediate terminal and the power supply terminal. When a counting signal circuit and a reset signal circuit having a control power source as the power source are connected to the counting terminal and the reset terminal, the common terminal and the intermediate terminal are connected, and the counting signal circuit having the low voltage source as the power source is provided. When the reset signal circuit and the reset signal circuit are connected to the counting terminal and the reset terminal, by connecting the common terminal to the low voltage source, it is possible to reduce the total amount of heat generated by each resistor connected to the signal circuit. The rise can be suppressed to a low level to improve the reliability, and since the number of signal terminals can be reduced, erroneous connection can be prevented and the cost can be reduced.

[Brief description of drawings]

FIGS. 1 and 2 show an embodiment of an electronic counter according to the present invention. FIG. 1 is a wiring diagram when an AC power source is used as a signal power source, and FIG. 2 is a wiring diagram when a DC power source is used as a signal power source. FIGS. 3, 3 and 4 show an example of a conventional electronic counter, FIG. 3 is a connection diagram when an AC power supply is used as a signal power supply, and FIG. 4 is a connection diagram when a DC power supply is used as a signal power supply. Is. 1,2: Power supply terminal, 3,4: Counting terminal, 5,6: Reset terminal, 7: Common terminal, 8: Photocoupler for counting, 9: Photocoupler for resetting, 12: AC power supply, 14: Counting resistor, 16: Reset resistance, 23:
Count signal contact, 24: Reset signal contact, 25: DC power supply, 26
a, 27a: Output transistor, 28: Intermediate terminal, 29: Common resistance,
30: Capacitor.

Claims (2)

[Scope of utility model registration request] 1. A power supply terminal to which a control power supply is connected,
A count terminal for connecting a count signal circuit using this control power source or a low voltage source lower than the control power source as a power source, and a reset terminal for connecting a reset signal circuit using the control power source or a low voltage source lower than the control power source as a power source A counting photocoupler common to the control power source and the low voltage source having one input terminal connected to the counting terminal via a counting resistor,
Of the reset photocoupler common to the control power supply and the low voltage source having one input terminal connected to the reset terminal via a reset resistor having a resistance value lower than that of the counting resistor, the counting photocoupler and the reset photocoupler. A count signal circuit and a reset signal circuit, each of which has a common terminal having the other input terminal commonly connected, an intermediate terminal, and a common resistor connected between the intermediate terminal and the power supply terminal, and which uses the control power supply as a power supply. When the counter is connected to the reset terminal and the common terminal is connected to the intermediate terminal, and the count signal circuit and the reset signal circuit that use the low voltage source as the power supply are connected to the count terminal and the reset terminal, the common terminal is the low voltage source An electronic counter characterized by being connected to. 2. An electronic counter according to claim 1, wherein a utility model is registered, wherein a capacitor is connected in parallel with a common resistor.