JP2008259315A - Apparatus and method for backing up power supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To lengthen the interval of backup primary battery replacement. <P>SOLUTION: When a stepping motor 7 as a motor is driven by a commercial power supply or a primary battery, such as a dry battery, (or a rechargeable secondary battery) as an interruptible power supply 31, the following operation is performed: a backup secondary battery 37 as a second rechargeable backup battery is charged with power from the revolution of the stepping motor 7 or power from the power supply line of the motor. When there is no power supply from the interruptible power supply 31, first, switching is carried out so that power is supplied from the backup secondary battery 37 to a backup logic 33 for storing and holding at least setting information. Further, the voltage of the backup secondary battery 37 is monitored. When this voltage drops to a specified value or below, switching is carried out so that power is supplied from the backup primary battery 34 to the backup logic 33. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a power backup apparatus and a power backup method suitable for portable or portable devices.

  Conventionally, as a portable or portable device, there is a small and light printer, for example. In such a printer, for example, date and time information such as date and time previously set in the memory, or print information such as print density is backed up by a backup battery so as not to disappear. ing.

  By the way, in such a printer, if it is left without being connected to a commercial power source, the backup battery is consumed.

  In this case, if left as it is, the power supply from the backup battery decreases with time. For example, date and time information such as date and time previously stored in the memory, or print information such as print density is displayed. It may disappear. In this case, it is necessary to replace the backup battery and reset and store the date / time information such as date and time or the print information such as print density in the memory.

In order to solve such problems caused by the consumption of the backup battery, Patent Document 1 has a main battery and a backup battery, and when the main battery is removed, the backup device is powered from the backup battery. In the mobile communication terminal to be supplied, a backup timer for measuring the backup time and a voltage detection means for detecting the voltage of the backup battery are provided, and the backup switch is shut down when the backup timer expires, and this A mobile communication terminal is proposed in which the backup switch is shut down when the backup battery voltage falls below a specified voltage even before the backup timer expires.
JP 2005-159472 A

  According to the mobile communication terminal disclosed in Patent Document 1 described above, the backup switch is shut down when the backup timer expires, and the voltage of the backup battery is equal to or lower than the specified voltage even before the backup timer expires. Since the backup switch is shut down at this point, the time during which the backup state can be maintained can be known in advance, and the capacity of the backup battery is not wasted.

  However, in such a method that the backup battery capacity is not wasted by shutting down such a backup switch, for example, date and time information such as a date and time previously set in a memory, or information such as an address. Since the backup battery power supply is used so that the battery does not disappear, leaving the main battery unattended without using it will cause the backup battery to wear out and expedite replacement of the backup battery. It was.

  The present invention has been made in view of such a situation, and an object thereof is to provide a power backup apparatus and a power backup method capable of solving the above-described problems.

The power backup device of the present invention is a power backup device to a backup logic that stores and holds at least setting information, and a motor that is driven by a normal power source and a power source to the backup logic when no power is supplied from the normal power source. A first backup battery to be supplied; a second backup battery that can be charged; and a charging circuit that charges the second backup battery with electric power generated by rotation of the motor or power from a power supply line of the motor. When there is no power supply from the power source, switching is performed so that power supply from the second backup battery is performed, and power supply from the first backup battery is performed when the voltage of the second backup battery falls below a specified value. It is characterized by being switched so as to be performed.
In addition, when there is no power supply from the normal power supply, the power supply switching circuit that switches the power supply from the second backup battery and the voltage of the second backup battery are monitored, and the voltage is a specified value. A backup power supply monitoring circuit that switches so that power supply from the first backup battery is performed when the following occurs can be provided.
The power backup method according to the present invention is a power backup method to a backup logic that stores and holds at least setting information, the step of driving a motor with a normal power supply, and the electric power generated by the rotation of the motor driven with the normal power supply or the motor Charging a second backup battery that can be charged with electric power from the power supply line, and switching to perform power supply from the second backup battery when there is no power supply from the normal power supply, And a step of monitoring the voltage of the second backup battery and switching the power supply from the first backup battery when the voltage falls below a specified value.
In the power backup device and the power backup method of the present invention, when the motor is driven by the normal power supply, the second backup battery that can be charged with the electric power from the rotation of the motor or the power from the power supply line of the motor is charged. When there is no power supply from the battery, first, the power supply is switched from the second backup battery to at least the backup logic that stores and holds the setting information, the voltage of the second backup battery is monitored, and the voltage is defined. When the value is less than or equal to the value, switching is performed so that power is supplied from the first backup battery to the backup logic.
Thereby, when there is no power supply from the normal power supply, the power supply to the backup logic that stores and holds at least the setting information by the second backup battery charged with the electric power from the rotation of the motor or the electric power from the power supply line of the motor Therefore, the consumption of the first backup battery can be suppressed during that time.

  According to the power backup apparatus and the power backup method of the present invention, the power to the backup logic that stores and holds at least setting information by the second backup battery charged with the electric power from the rotation of the motor or the electric power from the power supply line of the motor. Since the supply is performed and the consumption of the first backup battery is suppressed during that time, the replacement time of the first backup battery can be extended.

  In this embodiment, when a motor is driven by a normal power source that is either a commercial power source or a primary battery (or a rechargeable secondary battery) such as a dry battery, the power from the rotation of the motor or the power supply line of the motor When the second backup battery that can be charged is charged and there is no power supply from the normal power supply, the power supply is first switched to the backup logic that stores and holds at least setting information from the second backup battery, Further, the voltage of the second backup battery is monitored, and switching is performed so that power is supplied from the first backup battery to the backup logic when the voltage falls below a specified value.

  Thereby, when there is no power supply from the normal power supply, the power supply to the backup logic that stores and holds at least the setting information by the second backup battery charged with the electric power from the rotation of the motor or the electric power from the power supply line of the motor In the meantime, since the consumption of the first backup battery is suppressed, the replacement time of the first backup battery can be extended.

  Examples of the present invention will be described below. FIG. 1 is a diagram showing an embodiment in which the power backup device of the present invention is applied to a label printer.

  The label printer shown in the figure is a portable type or a portable type. For example, a mount 2 on which a plurality of labels 1 having a peelable adhesive surface on the side opposite to the printing surface is temporarily attached is peeled. Via a supply shaft 4 that rotatably supports a continuous label body 3 wound around, a print head 5 that performs printing on the label 1, a platen roller 6 that presses the label 1 against the print head 5, and a belt 8. A stepping motor 7 for applying a rotational driving force to the platen roller 6 is provided.

  Further, the label printer shown in the figure has a light emitting portion 9a and a light receiving portion 9b so as to sandwich the mount 2 and the label 1, and the gap between the labels 1 serving as a reference position of the label 1 to be printed (between the labels 1 A transmission type paper detection sensor 9 that is a sensor unit for detecting a portion (only the mount 2), a control unit 10 that controls a printing operation by the print head 5, a drive by the stepping motor 7, and the like, and a power source that supplies power to each unit Circuit 30.

  Details of the power supply circuit 30 will be described later. Further, the paper detection sensor 9 may detect the edge of the label 1 other than the gap of the label 1 (the portion of the mount 2 only between the labels 1), and is not limited to the transmissive type. 1 or a reflection type sensor that detects a predetermined position detection mark on the mount 2.

  FIG. 2 is a diagram for explaining the details of the control unit 10.

  As shown in the figure, the control unit 10 includes a CPU 11, a ROM 12, a RAM 13, a motor control unit 14, a print control unit 15, a sensor control unit 16, a power input circuit 17, an external interface 18, and an interface 19.

  The CPU 11 operates according to a control program stored in the ROM 12 and controls each unit. The ROM 12 stores a control program and the like necessary for the operation of the CPU 11. In the RAM 13, print data such as characters, graphics, and barcodes to be printed is developed.

  The motor control unit 14 supplies a pulse signal to the stepping motor 7 to drive the stepping motor 7. The print control unit 15 generates a control signal corresponding to the print data and supplies it to the print head 5 to perform a printing operation. The sensor control unit 16 controls the detection operation of the paper detection sensor 9 and receives the detection result from the paper detection sensor 9 and supplies it to the CPU 11.

    The power input circuit 17 takes in the power from the power circuit 30. The external interface 18 transmits and receives data to and from a device such as a host computer connected to the outside. The interface 19 accepts input data from the input unit 20 and sends a display signal to the monitor 21.

  FIG. 3 is a diagram for explaining the details of the power supply circuit 30.

  As shown in the figure, the power supply circuit 30 includes a normal power supply 31, a supply power supply switching circuit 32, a backup logic 33, a backup primary battery 34, a changeover switch 35, a backup power supply monitoring circuit 36, a backup secondary battery 37, and a charging circuit 38. It has.

  The normal power supply 31 is either a commercial power supply or a primary battery such as a dry battery (or a rechargeable secondary battery).

  The supply power switching circuit 32 supplies power from the normal power supply 31 to the backup logic 33 when power is supplied from the normal power supply 31, and backs up the secondary battery 37 or backup when there is no power supply from the normal power supply 31. It switches so that the power supply from the primary battery 34 may be supplied to the backup logic 33. FIG.

  The backup logic 33 is a circuit that stores and holds date / time information such as a preset date and time, or print information such as print density.

  The backup primary battery 34 is a battery that can be replaced when the battery is exhausted, such as an AA battery or an AAA battery.

  The changeover switch 35 switches the connection from the backup secondary battery 37 or the backup primary battery 34 to the power supply switching circuit 32.

  The backup power supply monitoring circuit 36 monitors the voltage of the backup secondary battery 37, and when the voltage of the backup secondary battery 37 becomes equal to or less than a specified value, the changeover switch 35 is switched to switch to the power supply from the backup primary battery 34. Control.

  The backup secondary battery 37 is a rechargeable battery. The charging circuit 38 is a circuit that charges the backup secondary battery 37 with the electric power generated by the rotation of the stepping motor 7 or the electric power from the power supply line of the stepping motor 7.

  Next, a power backup method will be described.

  First, as shown in FIG. 4, when power is supplied from the normal power supply 31 (step S1), the power supply switching circuit 32 supplies the power from the normal power supply 31 to the backup logic 33 (step S2).

  At this time, when the stepping motor 7 is driven by the power supply from the normal power supply 31, the charging circuit 38 charges the backup secondary battery 37 with the power generated by the rotation of the stepping motor 7 or the power supply line of the stepping motor 7. (Step S3).

  On the other hand, when there is no power supply from the normal power source 31, that is, when there is no power supply from a primary battery (or a rechargeable secondary battery) such as a commercial power supply or a dry battery, the backup switch Switching is performed so that power from the secondary battery 37 is supplied to the supply power switching circuit 32 side (step S4). In this case, power supply from the backup primary battery 34 is not performed.

  Here, the voltage of the backup secondary battery 37 is monitored by the backup power supply monitoring circuit 36 (step S5), and when the voltage of the backup secondary battery 37 becomes equal to or lower than the specified value, the switch 35 is switched by the backup power supply monitoring circuit 36. Is switched so that the power from the backup primary battery 34 is supplied to the supply power switching circuit 32 (step S6).

  As a result, the power consumption of the backup primary battery 34 is suppressed while the power supply from the backup secondary battery 37 is being performed.

  As described above, in this embodiment, when the stepping motor 7 that is a motor is driven by the normal power supply 31 that is either a commercial power supply or a primary battery (or a rechargeable secondary battery) such as a dry battery, the stepping motor 7 is driven. When the backup secondary battery 37, which is a second backup battery that can be charged with the power of the rotation of the motor or the power supply line of the motor, is charged and no power is supplied from the normal power source 31, the backup secondary battery 37 At least the power supply to the backup logic 33 that stores and holds the setting information is switched, and the voltage of the backup secondary battery 37 is monitored. When the voltage falls below a specified value, the backup primary battery 34 backs up. Switching was performed so that power supply to the logic 33 was performed.

  As a result, when there is no power supply from the normal power supply 31, backup logic that stores and holds at least setting information by the backup secondary battery 37 that is charged with the power from the rotation of the stepping motor 7 or the power from the power supply line of the motor. Since the power supply to 33 is performed and the battery consumption of the backup primary battery 34 is suppressed during that time, the replacement time of the backup primary battery 34 can be extended.

  The present invention is not limited to the label printer, and can be applied to other devices such as a mobile phone, a video camera, a digital camera, a portable personal computer, and a portable game machine.

It is a figure which shows one Example at the time of applying the power supply backup apparatus of this invention to a label printer. It is a figure for demonstrating the detail of the control part of FIG. It is a figure for demonstrating the detail of the power supply circuit of FIG. 3 is a flowchart for explaining a power backup method in the power circuit of FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Label 2 Mount 3 Label continuous body 4 Supply axis 5 Print head 6 Platen roller 7 Stepping motor 8 Belt 9 Paper detection sensor 9a Light emission part 9b Light reception part 10 Control part 14 Motor control part 15 Print control part 16 Sensor control part 17 Power input Circuit 18 External interface 19 Interface 20 Input section 21 Monitor 30 Power supply circuit 31 Normal power supply 32 Supply power switching circuit 33 Backup logic 34 Backup primary battery 35 Changeover switch 36 Backup power supply monitoring circuit 37 Backup secondary battery 38 Charging circuit

Claims (3)

A power backup device to backup logic that stores and holds at least setting information,
A motor driven by a normal power supply;
A first backup battery for supplying power to the backup logic when there is no power supply from the normal power supply;
A rechargeable second backup battery;
A charging circuit for charging the second backup battery with electric power generated by rotation of the motor or electric power from a power supply line of the motor;
When there is no power supply from the normal power supply, switching is performed so that power supply from the second backup battery is performed, and when the voltage of the second backup battery becomes equal to or lower than a specified value, the first backup battery A power backup device characterized by being switched so that power is supplied. A power supply switching circuit for switching so that power supply from the second backup battery is performed when there is no power supply from the normal power supply;
A backup power supply monitoring circuit that monitors the voltage of the second backup battery and switches the power supply from the first backup battery when the voltage falls below a specified value. The power backup apparatus according to 1. A power backup method to backup logic that stores and holds at least setting information,
A process of driving a motor with a normal power source;
Charging a second backup battery that can be charged with electric power from rotation of the motor driven by the normal power source or electric power from a power supply line of the motor;
When there is no power supply from the normal power supply, switching to perform power supply from the second backup battery;
And a step of switching so that power supply from the first backup battery is performed when the voltage of the second backup battery becomes equal to or lower than a specified value.

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