JPS6214757Y2 - - Google Patents

Description

[Detailed description of the invention] "Industrial application field" This invention relates to an electronic counter (electronic total counter, preset counter, etc.) that can retain the counting memory of the counting circuit using a primary or secondary battery (hereinafter simply referred to as battery) when the main power supply is cut off and can display the remaining charge of the backup battery when the main power supply is cut off.

“Prior art” Conventionally, in most electronic counters,
When the main power supply is cut off due to a power outage or the like, the counted values that have been counted and stored up to that point are lost at the Kusunoki point. As a means to solve this problem, there is a configuration in which a primary battery (dry battery) is connected to the counting circuit, and power is sent to the counting circuit instead when the main power supply is cut off.

``Problems that the invention aims to solve'' However, since the battery with the above configuration is a primary battery, it is not suitable for long-term use, and furthermore, it is not possible to know the remaining battery power, so the primary battery There are drawbacks such as the fact that the counting circuit may not be able to hold the memory accurately due to insufficient remaining capacity.

"Means for Solving the Problems" In view of the above-mentioned conventional drawbacks, the present invention provides an electronic counter that electronically counts counting input pulses.
Batteries (primary batteries and secondary batteries) when the main power is cut off
In addition to maintaining the counting memory of the counting circuit, the remaining battery capacity display circuit is driven to display the remaining capacity of the battery, and if necessary, the remaining capacity of the battery and the battery are An electronic counter is provided in which a switch is connected in series between display circuits.

``Example'' Hereinafter, a case in which the present invention is implemented in an electronic total counter shown in FIG. 1 will be described in detail with reference to the drawings.

In FIG. 1, 1 is an input circuit that inputs the counting pulses applied to the input terminal IN ₁ , 2 is a counting circuit that counts the counting pulses sent from the input circuit 1, and 3 is the counting output of the counting circuit 2. The output is sent to the display circuit 4 by a decoder circuit that decodes the . 5 is a reset circuit that sets counting circuit 2 to "0" when a reset signal is applied to reset terminal IN ₂ .
This is for resetting. 6 is each circuit 1 to 5 above
This is the main power supply circuit for supplying a stabilized power supply _V1 to operate the system, and is composed of a transformer, a diode, a Zener diode, a transistor, etc. The above is the basic circuit configuration of the electronic total counter. Further, the main power supply circuit 6 sends a charging current to a storage battery E as an auxiliary power supply circuit 7 which sends out an auxiliary power supply V ₂ via a diode D ₁ and a resistor R ₃ . Reference numeral 8 denotes a circuit for displaying the remaining capacity of the storage battery E, and in the circuit of this embodiment, the display is turned on when the remaining capacity of the storage battery E becomes lower than the usable voltage. In other words, the connection between the cathodes of the first and second Zener diodes ZD ₁ and ZD ₂ is
A bridge circuit is formed by connecting the anodes of the first and second Zener diodes ZD ₁ and ZD ₂ with a second resistor R _{2 ,} and further connecting the first resistor R ₁ and the cathode of the second Zener diode ZD ₂ , the connection point D between the anode of the first Zener diode ZD ₁ and the second
A display circuit in which a protective diode _D2 and a light emitting diode LED as a display element are connected in series is inserted and connected between the connection point C and _the resistor R2. Connection points A and B are connected to the positive and negative sides of the storage battery E, respectively. Also, the diode
D ₃ and D ₄ act as a voltage drop.

Furthermore, ZD ₃ is a Zener diode for stabilizing the display power supply V ₂ .

Therefore, when the electronic total counter is normally operating, the main power supply _V1 is supplied from the main power supply circuit 6 to each circuit 1 to 5, but if the main power supply circuit 6 is cut off due to a power outage, etc. Since the charge stored in the storage battery E is supplied to the counting circuit 2,
The counting circuit 2 continues to operate and can continue to hold the counting memory that has been counted up to that point. If the storage battery E is used many times and the discharge capacity is greater than the charging capacity, the remaining capacity of the storage battery E will drop below the usable voltage, and the remaining capacity of the storage battery will be sufficient to operate the counting circuit. There may be cases where it disappears. In this case, the remaining capacity display circuit 8 operates and lights up the issuing diode LED to indicate that the storage battery E
This indicates that there is insufficient remaining capacity. In other words, the voltage applied between the connection point AB is the Zener diode
If the Zener voltage of ZD ₁ and ZD ₂ is higher than the total voltage (when the remaining battery capacity is normal), the connection point DB
Since the voltage across CB is higher than the voltage between CB, no current flows through the light-emitting diode LED, so it does not light up. However, if the voltage applied across the connection point AB is low (when the remaining battery capacity is insufficient), CB From the voltage between
When the voltage between DB and DB increases, current flows to the light emitting diode LED and it lights up, indicating that the remaining battery capacity of storage battery E is insufficient. By charging, memory loss and malfunction of the counting circuit 2 can be prevented.

Figure 2A shows a second embodiment of the battery remaining capacity display circuit, in which the light emitting diode LED is connected in the opposite polarity to the connection polarity of the light emitting diode LED of the remaining capacity display circuit 8 of the embodiment shown in Figure 1. , a protective resistor _R4 is connected in series with the light emitting diode.In this circuit, the light turns on when there is sufficient remaining battery power, and turns off when the remaining power is insufficient. This indicates that the battery level is low.

Figure 2 (b) shows a third embodiment of the battery remaining capacity display circuit, which uses two different-colored light emitting diodes, LED _G and LED _R , and connects them between the connection points CD with their polarities reversed. The circuit is designed to display both when the remaining capacity of the storage battery is too high and when it is too low. In the case of this circuit, discrimination may be made by using two light emitting diodes of the same color and adjusting the current flowing through each diode with a resistor to generate a difference in brightness.

Figure 2C shows a fourth embodiment of the battery remaining capacity display circuit, which has a resistor R ₅ , a Zener diode ZD ₄ , and a light emitting diode LED connected in series, and emits light when the voltage between AB is higher than the Zener voltage. diode
It has an LED that lights up, and has the same effect as in Figure 2 A. Figure 3 shows a switch connected in series to the remaining capacity display circuit for each of the batteries mentioned above, so that the remaining capacity of the batteries can be checked at will by closing the switch SW as necessary.
By providing this switch, unnecessary consumption of the battery can be prevented and the life of the battery can be improved.

"Effects of the Invention" As described above, the present invention has the effect of preventing the loss of counting memory in the counting circuit due to power outages, etc., or the loss of memory or erroneous memory operations due to battery exhaustion, etc.

Although the above description has been made regarding a secondary battery, it goes without saying that a primary battery may also be used. Furthermore, although the type of electronic counter has been described in terms of a total counter, the present invention can be similarly applied to other electronic preset counters and the like.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of an electronic total counter in which the present invention is implemented. Figure 2 A,
B and C are circuit diagrams showing second, third, and fourth embodiments of the remaining amount display circuit. FIG. 3 shows still another embodiment of the present invention, in which a switch is connected between the battery and the display circuit. 6...Main power supply circuit, 7...Auxiliary power supply, 8...Remaining power display circuit.

Claims (1)

[Scope of claim for utility model registration] (1) Counting input pulses are counted electrically, and when the main power supply is cut off, the counting memory of the counting circuit is retained by an auxiliary power supply provided separately from the main power supply. This is an electronic counter that is normally charged by the main power supply, and when the main power supply is cut off, the state of the output voltage is connected between the auxiliary power supply that supplies power to the counting circuit and the positive and negative poles of this auxiliary power supply. A residual power display circuit of an auxiliary power supply that detects and displays the remaining power is connected, and the remaining power display circuit is connected between the cathodes of the first and second Zener diodes through a first resistor, and the first and second A bridge circuit is formed by connecting the anodes of the first Zener diode with a second resistor, and the connection point between the first resistor and the cathode of the second Zener diode, the anode of the first Zener diode, and the second resistor. An electronic counter characterized by having a configuration in which a display circuit is connected between a connection point with a resistor. (2) The electronic device according to claim 1 of the utility model registration claim, characterized in that a series circuit of a resistor, a Zener diode, and a light-emitting element is connected between the positive and negative electrodes of the auxiliary power source as a remaining power display circuit of the auxiliary power source. expression counter.