JPH04265866A - Alarming method for voltage drop of battery - Google Patents

Abstract

PURPOSE:To prevent the operation inferiority during use by giving an alarm when the detected output voltage level of a battery becomes lower than the alarm giving voltage level corresponding to the load at this time. CONSTITUTION:At each time when the output voltage level E of a battery 15 detected by a voltage detection part 10, the level E is compared with the alarm giving voltage level EA corresponding to the load state signal transmitted from the internal circuit on the side of equipment among the data stored in a memory 11 corresponding to the communication state L at this time in the signal processing part 12 of an alarm apparatus 1. As the result of comparison, when the level E is equal to or lower than the level EA, an alarm signal is outputted to an alarm information part to perform necessary alarm display. As mentioned above, since the alarm giving voltage level is changed corresponding to the load state to the equipment so that the residual time before the output voltage level of the battery reaches the lowest operation voltage level of the equipment always becomes constant, the operation inferiority during use can be prevented.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a battery voltage drop warning method, and more specifically, the present invention relates to a battery voltage drop alarm method, and more specifically, regardless of the current consumption state of the device that receives power supply from the battery, the output voltage of the battery decreases and the device operates. The present invention relates to a device characterized in that an alarm is issued a predetermined period of time before the time when the device becomes disabled.

0002

[Prior Art] Recently, mobile devices such as mobile phones that utilize wireless signals have been developed and used.
In such devices, the internal circuits are driven by built-in primary batteries or rechargeable secondary batteries.As devices become smaller, the shape of the built-in batteries is also being restricted, and smaller and smaller capacity batteries are required. Batteries must be used, which necessitates frequent battery replacement and charging, and can easily cause problems such as the battery's output voltage dropping while the device is in operation, rendering it inoperable. Ta. As a countermeasure to this problem, a battery voltage drop warning device has been developed that displays a voltage drop warning before the output voltage of the battery drops to the minimum operating voltage of the device.

In order to explain the operating principle of such a battery voltage drop alarm device, FIG. 4 shows time on the horizontal axis, battery output voltage on the vertical axis, and a constant load state (load impedance) This shows the output voltage characteristics of the battery when The system prompts the user to replace and charge the battery. However, in such mobile phones, the load in the call state is extremely heavy compared to the load in the reception standby state, so that the voltage supplied to the internal circuit of the device decreases due to the internal resistance of the battery. Furthermore, when switching from the reception standby state to the call state with no alarm display being performed (point A in Figure 4), the output voltage characteristic L (solid line) during reception standby changes to the output voltage characteristic L during call.
' (dashed line), and the output voltage drops sharply. For this reason, the time T' from when the alarm display starts until the device becomes inoperable during a call is extremely reduced compared to the time T during reception standby mentioned above, and the amount of current consumption is significantly reduced. Since the time from the start of the alarm until the equipment becomes inoperable varies depending on the situation, even if an alarm is issued, it is not possible to accurately predict when the equipment will become inoperable, and it is difficult to provide adequate alarm functions. The reality is that it has not been achieved.

0004

[Problems to be Solved by the Invention] The present invention, proposed in view of the above-mentioned circumstances, is to provide a method for detecting a problem by a predetermined period of time before the time when the device becomes inoperable due to a drop in battery voltage, regardless of the load condition of the device. It is an object of the present invention to provide a battery voltage drop warning method that can accurately predict when a device will become inoperable.

[0005]

[Means for Solving the Problems] The method of the present invention proposed to achieve the above object determines the remaining time until the output voltage level of the battery decreases to the minimum operating voltage level of the device for each load of the device. Prepare in advance alarm notification voltage level data when a predetermined value is reached, and each time the battery output voltage level is detected, compare the detected battery output voltage level with the above alarm notification voltage level data corresponding to the load at that time. However, when the output voltage level of the battery falls below the alarm notification voltage level, an alarm is issued.

[0006]

[Operation] In the present invention, alarm notification voltage level data is prepared in advance for each load of the equipment when the remaining time until the output voltage level of the battery decreases to the minimum operating voltage level of the equipment reaches a predetermined value. , each time the output voltage level of the battery is detected, the detected output voltage level of the battery is compared with an alarm notification voltage level corresponding to the load of the device at this time among alarm notification voltage level data prepared in advance, Since an alarm is issued when the battery output voltage level falls below the alarm alarm voltage level, the time from when the alarm is issued until the equipment becomes inoperable is always a constant value, regardless of the load condition of the equipment. Become.

[0007]

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows the method of the present invention with a flowchart, in which an alarm is issued for each equipment load when the remaining time until the battery output voltage level E drops to the minimum operating voltage level of the equipment reaches a predetermined value. The following description assumes that data for determining each voltage level EA is prepared in advance. ■Detect the battery output voltage level E. ■The output voltage level E of the detected battery is set to the alarm notification voltage level that corresponds to the load of the device at this time (for example, off state, reception standby state, call state, etc.) among the alarm notification voltage level data prepared in advance. Compare with EA. ■As a result of the comparison, if the battery output voltage level E exceeds the alarm notification voltage level EA, the system returns to step (■) without issuing an alarm and repeats the same operation, but the battery output voltage level E exceeds the alarm notification voltage level EA. If it is below the voltage level EA, an alarm notification process is performed to notify the voltage drop. (The above steps 100 to 1 in Figure 1
(See 03). As described above, according to the method of the present invention, the remaining time from when an alarm is issued until the equipment becomes inoperable is always controlled to a constant value regardless of the load state of the equipment, so that the alarm is not started. It becomes possible to accurately predict when the equipment will become inoperable.

FIG. 2 is a block diagram showing an example of the internal configuration of the battery voltage drop alarm device 1 for carrying out the method of the present invention described above. In the figure, BT is a primary battery or a secondary battery for driving equipment. A secondary battery (the charging circuit is omitted), 10 is a voltage detection unit that detects the output voltage level of the battery, and 11 is a warning notification voltage level E that is set in advance for each load of the equipment.
Memory 12 consists of a ROM that stores the data of A, and memory 1
A signal processing section 13 performs signal processing necessary for alarm notification by referring to data stored in 1, and an alarm notification section 13 receives an alarm signal output from the signal processing section 12 and performs alarm notification.

FIG. 3 shows a method for obtaining data to be stored in the memory 11 in advance, and shows how to obtain data for each load such as off state L1, reception standby state L2, and call state L3 of equipment that receives power supply from battery BT. The output voltage characteristic data of the battery BT over time and the minimum operating voltage levels EL1 to EL3 for each of the loads L1 to L3 of the equipment are determined by conducting a test in advance, and based on these data obtained, the battery The alarm notification voltage level EA at which the remaining time until the output voltage level E drops to the lowest operating voltage level EL of the device reaches a predetermined value T is determined for each load, and the alarm notification is issued for each load L obtained. All data of voltage level EA is stored in memory 11. Here, the minimum operating voltage level E for each equipment load is
L1 to EL3 are, for example, in the off state L1, the minimum voltage EL1 required to normally operate the circuit associated with the voltage drop alarm device 1 on the equipment side, and in the talking state L3, the minimum voltage EL1 This is a unique value determined according to the load condition of the equipment so as to be the minimum voltage EL3 required to obtain the voltage EL3.

The operation of the voltage drop warning device 1 configured as above for carrying out the method of the present invention will be explained with reference to the graph of FIG. 3 above. The explanation will be given using an example in which the alarm device 1 is installed in a mobile phone (equipment) and is in a talking state. ■In the signal processing section 12, the voltage detection section 10
Each time the output voltage level E3 of the battery detected in The voltage level EA3 is compared with the alarm notification voltage level EA3 corresponding to the load status signal transmitted from the load status signal (as shown in the figure). ■As a result of the comparison, if the battery output voltage level E3 is higher than the alarm notification voltage level EA3, the operation returns to ■, but the battery output voltage level E is higher than the alarm notification voltage level E.
When it is below A3, an alarm signal is output to the alarm notification section 13 to cause necessary alarm display and the like.

[0011] In this way, the alarm notification voltage level is switched in accordance with the load condition of the equipment so that the remaining time until the output voltage level of the battery reaches the minimum operating voltage level of the equipment is always constant. As shown in FIG. 3, when the device is in the OFF state L1, an alarm display starts when the output voltage level E decreases to the alarm notification voltage level EA1, and when the device is not in the OFF state L1, the alarm display starts. When switching from to reception standby state L2, the transition from point P1 to P2 in the figure
(The reason why the output voltage decreases from E1 to E2 at the time of switching is due to the internal resistance of the battery), and when the output voltage level E2 decreases to the alarm notification voltage level EA2, the alarm display starts. Similarly, when switching from reception standby state L2 to call state L3 while no alarm display is being performed, the transition occurs from point P2 to point P3 in the figure, and as described above, when the output voltage level E3 decreases to EA3. The alarm display will start, and the time from the start of the alarm notification until the equipment becomes inoperable can be controlled to a constant value regardless of the load state of the equipment.

[0012] In the above explanation, the alarm notification voltage level data for each load obtained through testing is described as being stored in advance in the memory. It is also possible to configure such a configuration that these data are automatically stored in the memory by switching the load state on the side.

[0013]

[Effects of the Invention] As can be understood from the above explanation, according to the battery voltage drop alarm method of the present invention, regardless of the load condition of the equipment, the time from the start of the alarm until the equipment becomes inoperable is Since the time is always controlled to be constant, it is possible to accurately predict when the device will become inoperable, and it is possible to prevent inconveniences such as inoperability during use.

[Brief explanation of the drawing]

FIG. 1 is a flowchart illustrating a battery voltage drop warning method of the present invention.

FIG. 2 is a block configuration example diagram of a battery voltage drop warning device for implementing the method of the present invention.

FIG. 3 is a graph illustrating the operation of a battery voltage drop warning device for carrying out the method of the present invention.

FIG. 4 is a graph illustrating the operation of a conventional battery voltage drop warning device.

[Explanation of symbols]

BT Battery E Output voltage level EA (EA1, EA2, EA3) Alarm notification voltage level EL1 to EL3 Minimum operating voltage level L (L1, L
2, L3) Load T Predetermined time

Claims (1)

[Claims] Claim 1: For each equipment load, alarm notification voltage level data is prepared in advance when the remaining time until the battery output voltage level drops to the minimum operating voltage level of the equipment reaches a predetermined value, and the battery output voltage level data is prepared in advance. Each time the voltage level is detected, the detected output voltage level is compared with the above-mentioned alarm notification voltage level data corresponding to the load at that time, and when the output voltage level of the battery falls below the above-mentioned alarm notification voltage level, an alarm is issued. Battery voltage drop alarm method.