JP2009250860A - Radio device of battery voltage reduction detection apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem of inaccurate measurement resulting from a change in voltage according to temperature when measuring the voltage of a battery. <P>SOLUTION: Control means 10 uses timer means 12 to activate a temperature sensor 13 periodically (every hour) and detects the outside air temperature of the surroundings of a radio device 7. Then, values of detection by the temperature sensor 13 (outside air temperatures) and the points of time at which the values were detected are stored in temperature memory means 14. Meanwhile, a point of time at which the outside air temperature is lowest is calculated periodically (every 24 hours) using the timer means 12 from the outside air temperatures stored in the temperature memory means 14 and the points of time at which they were detected. The voltage of a battery 8 is detected by activating voltage detecting means 9 at that point of time. The value of voltage thus detected is stored in the temperature memory means 14. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a battery voltage drop detection device that detects a battery life of a wireless device using a battery as a power source.

  The conventional battery voltage drop detection device detects the voltage drop before the device becomes inoperable when the battery capacity decreases and the battery voltage decreases. It was detected at a constant voltage slightly higher.

  At this time, in order to reduce battery consumption due to the detection operation as much as possible, the detection operation is generally performed by operating the battery voltage drop detection device periodically, for example, once a day.

  In addition, in the configuration as described above, since the characteristics of the battery voltage that changes depending on the temperature are not taken into consideration, if the time for detecting the voltage is in the warm daytime, it is determined that the voltage is high at that time. Nevertheless, there is a problem that the temperature drops at night, the voltage of the battery decreases, and the device does not operate normally.

For this reason, a temperature detector for measuring the temperature around the battery is provided, and the battery voltage drop detection level is changed according to temperature data at the time of voltage detection (see, for example, Patent Document 1).
JP 2003-014830 A

  However, in the configuration in which the battery voltage drop detection level is changed, the battery life is shortened when it is determined that the battery voltage drop is high when the drop detection level is high compared to when the battery drop detection level is low. There has been a problem that the battery life of the device depends on the temperature.

  FIG. 2 shows an example of battery characteristics and detection levels. The horizontal axis indicates the amount of battery usage, and the vertical axis indicates the battery voltage. The battery characteristic curve 1 is a characteristic at normal temperature (25 ° C.), and the battery characteristic curve 2 is a characteristic at low temperature (−10 ° C.).

  When a battery voltage drop is detected at a constant detection level 3 regardless of temperature, for example, a battery that has reached detection level 3 at 25 ° C. has a voltage of point 4 at 25 ° C. When the voltage decreases toward 2, and voltage detection is performed at this timing, point 5 becomes the decrease detection voltage.

  Therefore, a detection difference 6 of the battery usage amount occurs due to a difference between when the detection timing is high and when the temperature is low.

  In order to solve the above-mentioned problems, the present invention stores the time when the temperature is lowest in the day based on the temperature information from the temperature sensor, and detects the battery voltage during the lowest temperature storage time of the previous day. .

  According to the present invention, a battery voltage detection function of a device using a battery as a power source is provided with a temperature correction function so that the battery life can be detected more accurately.

  The battery voltage drop detection device wireless device of the present invention includes a voltage detection means for detecting a battery voltage in a device using a battery as a power source, a control means for driving the voltage detection means and determining a drop in the battery voltage, and a built-in device Temperature storage means for storing the time when the temperature is the lowest on the previous day based on information from the temperature sensor, and the control means is configured to detect the voltage detection means at the time when the temperature is the lowest on the previous day stored in the temperature storage means. In a device using a battery as a power source for detecting the battery voltage through the terminal, the terminal detects the battery voltage by means for detecting the battery voltage, timer means for determining the detection timing, and information from the timer means. Control means for driving the means for determining the battery voltage drop, a wireless function for transmitting the information as wireless data when the voltage drops, and built-in Means for storing the time when the temperature is lowest in one day based on the information from the temperature sensor, and sending the information from the temperature storage means to the control means to detect the battery voltage at the lowest temperature storage time of the previous day. Is to do.

  As a result, the voltage of the battery decreases as the temperature decreases. Therefore, by measuring the voltage value during the time of the lowest temperature of the day, the change in the voltage drop detection level due to the temperature change can be corrected. Can do.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment)
FIG. 1 is a block diagram showing a wireless device incorporating a battery voltage drop detection device according to an embodiment of the present invention. The wireless device 7 operates using the battery 8 as a power source, and the voltage detection means 9 periodically detects the voltage of the battery 8 as a power source. The detection timing of the voltage detection means 9 will be described later. Then, the control means 10 determines whether or not the voltage value detected by the voltage detection means 9 has fallen below a predetermined drop detection level.

  When it is determined that the detected voltage value is below a predetermined decrease detection level, the control means 10 transmits the voltage decrease information to the wireless master device 15 by the wireless function 11. As for the radio signal from the radio function 11, the information received by the radio cell station 15 is transmitted to the control center that controls the radio cell station 15, so that the control center grasps the state of the radio apparatus device 7. be able to. Information will arrive.

  Here, the process of the control means 10 regarding voltage detection is demonstrated. The control means 10 uses the timer means 12 to activate the temperature sensor 13 periodically (every hour) to detect the temperature around the battery 8. And the detected value (temperature) by the temperature sensor 13 and the time when it was detected are stored in the temperature storage means 14.

  Moreover, the control means 10 calculates | requires the time with the lowest temperature from the temperature memorize | stored in the temperature memory | storage means 14 regularly (every 24 hours) using the timer means 12, and the time which detected it. And the voltage detection means 9 is started at the time when temperature is the lowest, and the voltage of the battery 8 is detected. Thus, since the battery voltage is detected during the minimum temperature storage time of the previous day, the battery life can be detected more accurately.

If the temperature storage means 14 does not store the temperature and data relating to the time at which the temperature is detected, the control means 10 uses the signal from the timer means 12 only and periodically (every 24 hours) the voltage detection means 9. The battery 8 is operated and the voltage of the battery 8 is detected. Thereby, generation | occurrence | production of the detection difference of the battery usage-amount by a temperature change can be prevented, and it can be set as the apparatus of the stable battery life.

  Of course, when the temperature change is small, the voltage detection means 9 is set to the normal timer means periodically (every 24 hours) without depending on the outside temperature stored in the temperature storage means 14 and the time when the temperature is detected. A function of performing a detection operation with priority given to activation may be provided.

  As described above, the battery voltage drop detection device wireless device according to the present invention has a built-in temperature sensor, stores the time when the temperature is the lowest in one day, and thus the temperature condition of the battery voltage detection operation from the next day. Therefore, it can be applied to all devices driven by batteries.

Configuration diagram of radio apparatus of the present invention Characteristic diagram showing battery characteristic curve

Explanation of symbols

1 Battery characteristic curve (25 ℃)
2 Battery characteristic curve (-10 ° C)
DESCRIPTION OF SYMBOLS 3 Detection level 4 Detection point of 25 degreeC 5 Detection point of -10 degreeC 6 Detection difference 7 Radio | wireless apparatus apparatus 8 Battery 9 Voltage detection means 10 Control means 11 Wireless function 12 Timer means 13 Temperature sensor 14 Temperature storage means 15 Wireless main | base station

Claims (1)

In a device powered by a battery, voltage detection means for detecting the battery voltage at this terminal,
Timer means for determining the timing to detect, control means for driving the means for detecting the battery voltage based on information from the timer means, and for determining a decrease in the battery voltage;
A wireless function for transmitting the information as wireless data when the voltage drops, and a temperature storage means for storing a time during which the temperature is the lowest in the previous day based on information from a built-in temperature sensor, The battery voltage is detected during the lowest temperature storage time of the previous day by sending information from the voltage detection means to the control means during the lowest temperature of the previous day stored in the temperature storage means. A battery voltage drop detection device wireless device characterized by the above.

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