JPH0755628Y2 - Backup power supply - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a backup power supply device used for a memory such as a programmable controller.

[Prior Art] FIG. 4 is a connection diagram of a conventional backup power supply device including a power supply for backing up a memory for storing and holding data and a backup power supply monitoring circuit for monitoring the state of the power supply.

In FIG. 4, reference numeral 1 is a battery as a backup power source, the negative terminal of this battery 1 is grounded, and the positive terminal is
When the battery 1 is a primary battery, it is connected to the memory power supply Vm via a diode 2 that prevents the memory power supply Vm from being charged and a resistor 3 that limits the charging current when the diode 2 has a short circuit failure. . The backup power supply monitoring circuit 4 connected in parallel to the battery 1 includes a comparator 5 that monitors the battery voltage and a comparator 6 that monitors the battery removal. The negative input terminal of the comparator 5 is connected to the positive terminal of the battery 1, and the positive input terminal of the comparator 5 has a reference voltage Vs.
Are connected via a resistor 7. 8 is a comparator 5
Is a resistor connected between the output terminal and the + input terminal, and the resistor 8 and the resistor 7 provide the reference voltage Vs with a hysteresis characteristic to prevent the logic from being uncertain due to noise or the like. . The reference voltage Vs is connected to the − input terminal of the comparator 6, and the + input terminal is connected to the logic power supply Vcc via the − terminal of the battery 1 and the resistor 9. The output terminals of the comparators 5 and 6 are connected to a microprocessor unit (not shown).

In the backup power supply device described above, the detection signal output from the comparator 5 when the battery voltage is equal to or higher than the specified value.
Sd is a low level signal “0” (hereinafter, the low level signal is simply referred to as “0”), and when the battery voltage drops below a specified value, the detection signal Sd is a high level signal “1” (hereinafter the high level signal is simply referred to as “0”). (Referred to as 1). In addition, the detection signal output from the comparator 6 when the battery 1 is connected
So is "0", and the detection signal So turns to "1" when the battery 1 is artificially removed. The detection signals Sd and So from the respective comparators 5 and 6 are read into the microprocessor unit, and the microprocessor unit determines the normal state and the abnormal state based on the truth table of the detection signals Sd and So.

Normally, a programmable controller is usually equipped with the above-mentioned backup power supply device using a battery in order to store and retain the data before the power failure at the time of power failure.
There is also a case of so-called batteryless operation that does not require this backup power supply device, and in such a case, it is not necessary to monitor the backup power supply device and the troublesomeness of the monitoring can be eliminated. In case of battery-less operation, it is provided with a changeover switch.

[Problems to be solved by the device]

In the above-mentioned backup power supply device, a space is required to provide a changeover switch for switching to batteryless operation, and it is difficult to secure the space in recent years when miniaturization is demanded. There is a problem in that the cost is increased by providing the changeover switch only for changing over to the operation.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks of the conventional device and to provide a backup power supply device that can be easily switched to the batteryless operation with a simple configuration without increasing the space.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention can replace the battery unit in a backup power supply device including a battery unit containing a battery as a backup power supply and a backup power supply monitoring circuit connected in parallel to the battery unit. A batteryless unit is provided in which the pins corresponding to the + and-terminals of the battery in the battery unit are short-circuited, and the battery unit and the batteryless unit are detachably connected to the backup power supply monitoring circuit via sockets, respectively. It is characterized by

[Action]

In the backup power supply device according to the present invention, when the backup by the battery is required, the battery unit is connected to the socket provided in the backup power supply monitoring circuit, and when switching to the batteryless operation which does not require the backup power supply, the backup power supply is used. The battery unit connected to the socket of the monitoring circuit is removed, and instead of this battery unit, a separately prepared battery-less unit is connected to the socket of the backup power supply monitoring circuit.

〔Example〕

Next, an embodiment of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a connection diagram showing an embodiment of a backup power supply device according to the present invention. In FIG. 1, the same parts as those of the conventional device shown in FIG. 4 are designated by the same reference numerals.

In FIG. 1, the connection relationship of the comparators 5 and 6 of the backup power supply monitoring circuit 4 is the same as that of the conventional device, but the sockets 10 are provided at the terminals x, y and z for connecting the backup power supply of the backup power supply monitoring circuit 4. This is different from the conventional device. This socket 10 has a terminal for connecting the + terminal of the battery of the conventional device as an x-receiver, one terminal of the battery for connecting the ground as a y-receiver, and a terminal common to this-terminal is separated to be a z-terminal. There is.

2 shows the battery unit 11, and FIG. 3 shows the batteryless unit 12
The battery unit 11 or the batteryless unit 12 is connected to the socket 10. As shown in FIG. 2, the battery unit 11 is composed of the + terminal of the battery 1 as the x pin, the − terminal as the y pin, and the z pin commonly connected to the y pin, and the battery 1 is connected between the x pin and the y pin. Are connected. Also, as shown in FIG. 3, in the batteryless unit 12, the x pin and the y pin are connected (short-circuited) by an electric wire, and the z pin is opened.

When the battery unit 11 is inserted and connected to the socket 10 of the backup power supply device shown in FIG. 1, the battery 1 functions as a backup power supply and the backup power supply monitoring circuit 4 operates as in the conventional device. In this case, when the voltage of the battery 1 is above the specified value, the detection signals Sd and So from the comparators 5 and 6 are both "0", and when the voltage of the battery 1 drops below the specified value, the detection signal Sd is " Change from "0" to "1". Due to this change in the signal, the microprocessor determines that the voltage of the battery 1 has dropped below the specified value. Remove the battery unit 11 from the socket 10
Alternatively, if the battery-less unit 12 is inserted into the socket 10 and connected, it operates without a backup power supply and the backup power supply monitoring circuit 4 does not need to be monitored. When the battery-less unit 11 is inserted into the socket 10, the detection signals Sd and So both become "1", and the microprocessor determines that the battery-less unit 12 is mounted and the battery-less operation is performed by this signal. If the operator forgets to attach the battery unit 10 or the batteryless unit 12 to the socket 10, the detection signal Sd is "0",
Since the detection signal So becomes "1", the microprocessor artificially determines that the battery unit 11 or the batteryless unit 12 has been removed.

[Effect of device]

As described above, according to the present invention, a backup power supply device including a battery unit containing a battery as a backup power supply and a backup power supply monitoring circuit connected in parallel to the battery unit can replace the battery unit. A batteryless unit is provided in which the pins corresponding to the + and-terminals of the battery in the battery unit are short-circuited, and the battery unit and the batteryless unit are detachably connected to the backup power supply monitoring circuit via sockets, respectively. With this configuration, the normally required backup power supply can be obtained by inserting the battery unit into the socket of the backup power supply monitoring circuit, and the battery unit is removed from the socket to replace the battery unit with a batteryless unit. Backup power supply if plugged in It is possible to switch to a battery-less operation which does not use a dedicated space for accommodating the switch and the changeover switch for switching the battery-less operation as in the conventional device without the need for, it is possible to miniaturize the apparatus.

[Brief description of drawings]

1 is a wiring diagram showing an embodiment of a backup power supply device according to the present invention, FIG. 2 is a wiring diagram of a battery unit, FIG. 3 is a wiring diagram of a batteryless unit, and FIG. 4 is a conventional backup power supply device. It is a connection diagram showing an example. 1: Battery, 4: Backup power supply monitoring circuit, 10: Socket, 1
1: Battery unit, 12: Battery-less unit.

Claims (1)

[Scope of utility model registration request] 1. A backup power supply device comprising a battery unit having a built-in battery as a backup power supply and a backup power supply monitoring circuit connected in parallel with the battery unit, the battery unit being replaceable with the battery in the battery unit. Is provided with a batteryless unit in which pins corresponding to the positive terminal and the negative terminal are short-circuited, and the battery unit and the batteryless unit are detachably connected to the backup power supply monitoring circuit via sockets, respectively. Buck power supply.