JPH0145232Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an electronic device that uses a battery as a power source and is equipped with a memory circuit.

(b) Prior art In electronic equipment equipped with a memory circuit having read and write functions, power is supplied to the memory circuit even when the power switch is released in order to prevent information written in the memory circuit from being erased. There is a need to. Such electronic equipment includes a battery for supplying power for memory retention to the memory circuit, that is, a backup battery. Electronic devices equipped with such backup batteries can retain information written in the memory circuit for a long time, but the problem is that the backup battery wears out and the information disappears when the battery is replaced. have. There is a device that improves this point by guiding the power from the battery installed in the electronic device to the memory circuit by closing the power switch. You may forget to do this and remove the backup battery.
It has the disadvantage that valuable information is erased.

(c) Purpose of the invention The present invention aims to provide a power supply device that prevents the information stored in the memory from being erased when the backup battery is replaced.

(d) Structure of the invention The present invention provides a switch that can be switched by opening and closing a lid provided to cover the storage section in which the backup battery is stored, and this switch can switch the operation of the drive battery. The power source from the memory circuit is led to the memory circuit for backup purposes.

(e) Example This explanation is based on storing a telephone number in a memory circuit,
This is a case in which the present invention is implemented in an automatic dialing device that can easily make a call by reading out the stored number. FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a bottom view of the automatic dialing device, and FIG. 3 is a side view of the main parts. In the figure,
1 is a driving battery; 2 is a power switch; 3 is a key operation unit to which power is supplied and becomes operational when the power switch 2 is closed; 4 is a key operation unit 3
A control circuit 5 operates in response to a signal input by the operation of the key operation section 3, and a control circuit 5 writes the telephone number operated by the key operation section 3 by the control circuit 4, and also performs a reading operation by the key operation section 3. This is a memory circuit from which a telephone number stored by the telephone number is read out. Reference numeral 6 indicates a memory circuit 5 based on signals from the key operating section 3 or operations on the key operating section 3.
This is an output circuit that sends out the readout signal from the telephone line as a dial signal to the telephone line. The driving battery 1
Power is applied to the key operation section 3, control circuit 4, and output circuit 6 through the power switch 2, and is applied to the memory circuit 5 through the resistor 7 and diode 8. 9 is a backup battery provided separately from the drive battery 1;
Its output is connected to be applied to the memory circuit 5 through a diode 10. 11
is a cabinet constituting an automatic dialing device, 1
Reference numeral 2 denotes a first lid provided to cover the storage portion 13 for the backup battery 9 formed in the cabinet 11, and 14 is provided to cover the storage portion 13 for the drive battery 1 formed in the cabinet 11. The second lid body is provided separately from the first lid body 12. 15 is open when the first lid body 12 is in the closed state, and the first
This is a control switch that is closed when the lid 12 is opened, and is connected in parallel to the power switch 2.

The present invention is constructed as described above, and its operation will be explained next. The state shown in FIG. 1 is a non-operating state, and the driving battery 1 and the backup battery 9 are respectively stored in the battery storage portions, and the first
The lid 12 and the second lid 14 are in a closed state. As a result of the first lid 12 being in a closed state, the control switch 15 is in an open state. In such a state, the power from the backup battery 9 is applied to the memory circuit 5 through the diode 10, so that the telephone number written in the memory circuit 5 will not be erased. In this state, when the power switch 2 is closed, power from the driving battery 1 is supplied to the key operation section 3, the control circuit 4, and the output circuit 6, and the key operation section 3, the control circuit 4, and the output circuit 6 are put into an operable state.
In such a state, when a telephone number is written using the key operation section 3, the writing operation to the memory circuit 5 is performed by the action of the control circuit 4. Furthermore, when the user operates the key operation section 3 to make a telephone call, the control circuit 4 reads out the telephone number written in the memory circuit 5, and the telephone number corresponding to the read telephone number is read out by the function of the control circuit 4. A dial signal is output by the output circuit 6. A telephone call can be made by sending the dial signal thus output to the telephone line. Further, by operating the key operation unit 3, the sending circuit 6 can output a dial signal corresponding to the key number. When the power switch 2 is released after performing such an operation, the key operation section 3,
The power supply to the control circuit 4 and the output circuit 6 is cut off, and the key operation section 3, the control circuit 4 and the output circuit 6 are cut off.
becomes inactive. However, the memory circuit 5 has a diode 1 rather than a backup battery 9.
Memory circuit 5 because power is supplied through 0
The phone number written on it will not be deleted.

As described above, the normal operation is performed, but next, the battery replacement operation will be explained. First, replacement of the driving battery 1 will be explained. Such driving battery 1
The replacement is carried out by opening the second lid 14, removing the driving battery 1 from the housing, storing a new battery in the housing, and closing the second lid 14. Although the driving battery 1 is replaced in this manner, the memory circuit 5 is not affected in any way. Next, replacement of the backup battery 9 will be explained. Such backup battery 9
The replacement is performed by opening the first lid 12, and when the first lid 12 is opened, the control switch 15, which was in the open state, is closed. When the control switch 15 is closed, power from the driving battery 1 is applied to the memory circuit 5 through the switch 15, the resistor 7, and the diode 8. Therefore, the backup battery 9 is stored in the storage section 13.
Even if it is removed, the telephone number stored in the memory circuit 5 will not be erased, and the backup battery 9 can be replaced without any trouble.

In this embodiment, a case has been described in which the present invention is implemented in an automatic dialing device, but it can also be implemented in an electronic device such as a portable computer.

(f) Effects of the invention In the power supply device of the invention, when the lid is opened to remove the backup battery that supplies power for memory retention to the memory circuit, power for memory retention is supplied from the drive battery to the memory circuit. With this structure, even if the backup battery is carelessly removed, the information stored in the memory circuit will not be erased, and the practical value of the present invention is very great.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, FIG. 2 is a bottom view of the automatic dialing device, and FIG. 3 is a side view of the main parts. Explanation of main drawing numbers, 1... Drive battery, 2... Power switch, 3... Key operation section, 4... Control circuit, 5... Memory circuit, 6... Output circuit, 9...
...Backup battery, 12...First lid, 14
...Second lid body, 15...Control switch.

Claims (1)

[Scope of utility model registration request] In an electronic device that uses a battery as a power source and is equipped with a memory circuit, there is a backup battery that constantly supplies power for memory retention to the memory circuit, and a drive power supply to the memory circuit, control circuit, etc. when a power switch is closed. a first lid provided to cover the storage portion of the backup battery; a second lid provided to cover the storage portion of the drive battery;
A power supply device for an electronic device, comprising a control switch that is closed when the first lid is in an open state and supplies power from the driving battery to the memory circuit as a memory holding power source.