JPH04335413A - Portable type data processor - Google Patents

Abstract

PURPOSE:To effectively utilize the remaining capacity of a battery by providing a boosting circuit. CONSTITUTION:A boosting circuit 3 receives supply of power from a battery 1 and boosts a voltage. A switching circuit 4 switches feed by the battery 1 and feed by the boosting circuit 3. Also, a voltage monitoring circuit 2 monitors the voltage of the battery 1, and executes a switching instruction to the switching circuit 4 so that feed by the battery 1 is switched to feed by the boosting circuit 3, when the voltage of the battery 1 becomes lower than the prescribed voltage. In such a way, a display part 5. a data input part 6 and a data communication part 7 can be operated normally even if the voltage of the battery 1 drops.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a portable data processing device, and more particularly to control of a built-in battery of a portable data processing device.

0002

[Prior Art] Conventionally, this type of portable data processing device is operated by a built-in battery, and in order to guarantee the operation of the device when the battery voltage drops, the device is Disable it and replace the battery, or
In the case of storage batteries, they could be used by charging them.

0003

[Problems to be Solved by the Invention] In the above-mentioned conventional portable data processing device, the device cannot be used when the battery voltage is lower than the device's guaranteed operating voltage. If it is low, the battery becomes unusable even if it has some remaining capacity, and there is a drawback that the battery capacity cannot be fully used.

0004

[Means for Solving the Problems] The present invention is a portable data processing device having a power supply battery, which comprises: a step-up circuit that boosts a voltage by receiving power from the power supply battery; A switching circuit that switches between power supply and power supply by the step-up circuit; and a switching circuit that monitors the voltage of the power supply battery, and when the voltage of the power supply battery drops below a predetermined voltage, switches the power supply from the power supply battery to the switching circuit; and a voltage monitoring circuit for instructing switching by the booster circuit.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Reference will now be made to the drawings for examples of the present invention.

FIG. 1 is a block diagram showing one embodiment of the present invention.

As shown in FIG. 1, the portable data processing device of the present invention includes a display section 5 that performs data processing, which is the function of this example, a data input section 6, a data communication section 7, and a control section 8. It is composed of a battery 1 that supplies power to these, a voltage monitoring circuit 2, a booster circuit 3, and a switching circuit 4. Here, the functions of the display section 5, data input section 6, and data communication section 7 are based on well-known techniques, and therefore description thereof will be omitted.

The voltage monitoring circuit 2 constantly monitors the power voltage of the built-in battery 1. Further, a booster circuit 3 is connected to the battery 1 . A battery 1 and a booster circuit 3 are connected to the switching circuit 4, and the power to be supplied to the data processing section (control section 8) of this embodiment is supplied from either side.

Next, the operation of this embodiment will be explained.

FIG. 2 is a diagram showing the state of battery voltage of the portable data processing device of the present invention. In FIG. 2, when the device is first operated using the power supplied by the battery 1, the battery voltage 11 gradually decreases as the usage time passes and approaches the device operation guarantee voltage 12. At this time, voltage monitoring circuit 2
When the battery voltage 11 drops to a predetermined switching point 15, the booster circuit 3 is activated. At the same time, the switching circuit 4 is operated to switch the power supplied to the data processing section (control section 8) from the battery 1.
to the output voltage of the booster circuit 3. Thereby, the supply voltage is maintained as shown by voltage 14 during boosting. When the output voltage of the booster circuit 3 further decreases to below the device operation guaranteed voltage 12, the control section 8 displays on the display section 5 an instruction to replace the battery 1 or to charge the battery 1 in the case of a storage battery.

As described above, in the portable data processing device of the present invention, when the output voltage of the battery 1 approaches the device operation guaranteed voltage 12, the battery 1 is further reduced until the output voltage approaches the battery final voltage 13.
The booster circuit 3 is operated using the remaining capacity.

0012

Effects of the Invention As explained above, in the present invention, when the voltage of the built-in battery decreases, the voltage is boosted and supplied by the booster circuit, so that even if the battery voltage falls below the guaranteed operation voltage, the device circuit Since the voltage supplied to the device is equal to or higher than the guaranteed operation voltage, the battery capacity can be used without wasting it, and the device can be used for a longer time than before.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention.

FIG. 2 is a diagram showing the state of battery voltage of the portable data processing device of the present invention.

[Explanation of symbols]

1 Battery 2 Voltage monitoring circuit 3 Boost circuit 4 Switching circuit 5 Display section 6 Data input section 7 Data communication department 8 Control section 11 Battery voltage 12. Guaranteed device operation voltage 13 Battery final voltage 14 Voltage when boosting 15 Switching point

Claims (1)

[Claims] 1. A portable data processing device having a power supply battery, comprising a step-up circuit that receives power from the power supply battery and boosts a voltage, a power supply by the power supply battery, and a power supply by the switching circuit. a switching circuit that monitors the voltage of the power source battery, and when the voltage of the power source battery drops below a predetermined voltage, an electrical switching circuit switches from power supply from the power source battery to power supply from the booster circuit; 1. A portable data processing device comprising: a voltage monitoring circuit for instructing switching.