JPS60251416A - Portable terminal equipment - Google Patents

Abstract

PURPOSE:To inform the replacing time or charging time of a battery to an operator always at the optimum state by changing reference voltage levels for deciding the drop of a battery voltage in accordance with the quantity of current consumption. CONSTITUTION:The reference voltage levels A, B are set up in accordance with the quantity of current consumption. If high current consumption is to be controlled, a control part 1 specifies the lower reference voltage level B to a battery voltage detecting means 2. At the control of low current consumption, the higher reference voltage level A is specified. Therefore, the means 2 operates in respective reference volage levels, so that the level of the battery voltages is decided by the reference volage level. When the battery voltage is low, a display means 3 is driven and the drop of the battery voltage lower than the reference level is informed to the operator. Since the reference levels A, B for deciding the drop of the battery voltage in accordance with the quantity of current consumption are formed, the replacing time or the like of the battery can be informed to the operator always at the optimum state.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a portable terminal device that uses a battery as a power source.

Conventional configuration and its problems Conventionally, in portable terminal devices that use a battery as a power source, a method has been used to detect a drop in battery voltage by comparing it with a predetermined reference voltage level. There is. However, in the conventional devices mentioned above, the reference voltage level is not determined according to the magnitude of current consumption, so when driving a part with small current consumption, the operator must immediately remove the battery even if it can still be used sufficiently. The replaced
There was a problem in that the battery could not be used effectively due to the need for charging.

OBJECTS OF THE INVENTION The present invention aims to eliminate the above-mentioned conventional drawbacks, and provides an excellent portable terminal device that can always inform an operator of the timing of battery replacement and charging in an optimal state. The purpose is to

Structure of the Invention In order to achieve the above object, the present invention provides a plurality of reference voltage levels for detecting battery voltage drop, and adjusts the voltage level between these reference voltage levels and one reference voltage according to the magnitude of current consumption. A level is selected, the selected reference voltage level is compared with the voltage of the battery, and a separately provided display means automatically displays that the voltage of the battery has fallen below the selected reference voltage level. It is configured to do so.

DESCRIPTION OF EMBODIMENTS The configuration of an embodiment of the present invention will be described below with reference to the drawings. In Figure 1, numeral 1 denotes a control section that controls each section. Reference numeral 2 denotes battery voltage drop detection means, which compares the voltage of the battery 4 with a reference voltage level selected by the control unit 1 and notifies the control unit 1 of the result. 5 is a memory section, and a programming section 7 serves as a portable terminal device. Barcode input section 8. It stores data from the transmission interface section 9 and the like, and provides data for controlling each section to the control section 1.

Reference numeral 6 denotes a printer interface section, which controls the externally connected printer 10 through a control section and supplies power from the portable terminal device. Reference numeral 7 denotes a key power section, which provides the operation or data of the portable terminal device to the control section 1 through the key power section 7. Reference numeral 8 denotes a barcode input section, which supplies barcode data to the control section and supplies power from the portable terminal device. Reference numeral 9 denotes a transmission interface, which transmits data from the host model and data from the portable terminal device. Reference numeral 3 denotes a display means, which displays input information, operation guides, etc. based on data from the control section 1.

Next, the operation of the above embodiment will be explained.

First, separate each part according to the magnitude of current consumption. The printer interface unit 6 has a large current consumption.
(including the printer), the barcode input section 8 (including the barcode reader), and the display means 3. Memory section 5, key human power section 6. There is a transmission interface section 9. When controlling a device with large current consumption, the control section 1 controls the battery voltage detection means 2 to
figure.

The lower reference voltage level B shown in FIG. 3 is designated. When controlling a device with a small battery consumption, the higher reference voltage level A is specified. Therefore, the battery voltage drop detection means 2 operates at each reference voltage level and determines whether the voltage is higher or lower than the reference voltage level. If it is low, the display means 3 is activated to inform the operator that the battery voltage has fallen below the above level. Second
Figures (a) and (b) are diagrams of battery discharge characteristics when current consumption is small and large, respectively. When the current consumption is small, the reference voltage level is set to a high level A, and when the current consumption is large, the reference voltage level is set to a low level B. It has been shown that by doing so, the battery can be used efficiently.

FIG. 3 is a discharge characteristic diagram of a battery when there are mixed current consumption modes. In this embodiment, when the current consumption is large, a relatively low reference voltage level B is selected, and when it is small, a relatively high reference voltage level A is selected.
Since this is used to determine the voltage drop of each battery, when the current consumption is large (such as when driving a printer), even if the voltage is lower than the reference voltage level A, the mode with lower current consumption is selected. If you decide that the battery still has plenty of use, you can use the battery very effectively. In this way, since the reference voltage levels are controlled differently depending on the magnitude of current consumption, it is possible to always set the timing for battery replacement and charging at the optimal timing, which is extremely advantageous in practice.

Effects of the Invention As is clear from the above embodiments, the present invention is configured to change the reference voltage level for determining a decrease in battery voltage depending on the magnitude of current consumption. This has the advantage that the battery replacement time and charging time can always be set at the optimal time, and the battery can be used extremely efficiently.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram of a portable terminal device according to an embodiment of the present invention, Fig. 2 is a discharge characteristic diagram of batteries when current consumption is small and large, and Fig. 3 is a diagram showing battery discharge characteristics when current consumption is large. It is a discharge characteristic diagram of a battery when the size of the battery becomes smaller, smaller, or mixed. DESCRIPTION OF SYMBOLS 1...Control part, 2...Battery voltage detection means, 3...Display means, 4...Battery.

Claims (1)

[Claims] A battery voltage drop detection means that has a plurality of reference voltage levels and detects when the voltage of a battery used as a power source falls below a reference voltage level selected from among the plurality of reference voltage levels; control means for selecting the reference voltage level of the battery voltage drop detection means depending on the magnitude of current consumption, and an output of the battery voltage drop detection means to cause the battery voltage to drop below the selected reference voltage level; A portable terminal device comprising display means for displaying information.