JPH05206921A - Circuit and method for detecting battery voltage of battery type communication equipment - Google Patents

Abstract

PURPOSE:To provide the battery voltage detection circuit of a burst transmission device, which can easily detect the deterioration of a battery. CONSTITUTION:An analog-digital converter 2 detecting the output difference of the battery 1 and converting it into a digital signal is provided for the battery type communication equipment transmitting a burst. A control part 3 and a monitor 4 monitoring the output of the analog-digital converter 2 at the timing of the presence or absence of burst transmission are provided. In the battery detection circuit of the burst transmission device, the output difference of the battery owing to the presence or absence of burst transmission has a tendency that it gradually becomes large as time elapses with the deterioration of the battery.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a voltage detection circuit, and more particularly, to a battery voltage detection circuit for a battery type communication device and a battery voltage detection method using the same.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional battery type communication device includes a burst transmitter main body 10 and a battery 1 which is a secondary battery such as a battery serving as a power source.
In order to detect the voltage of the battery 1, a battery voltage detection circuit having a voltage monitoring unit 53 that displays the voltage of the battery 1 converted by the analog-digital converter 2 (A / D converter) is provided.

[0003]

In the battery voltage detection circuit of the conventional battery type communication device, the voltage of the battery is detected by monitoring the voltage of the battery. Therefore, the voltage monitoring unit detects a high voltage. However, even if the internal resistance of the battery becomes large due to deterioration of the battery or the like, there is a problem that the mobile communication device cannot transmit due to insufficient current consumption used in the burst transmission device.

Therefore, a technical object of the present invention is to provide a battery voltage detection circuit and a battery for a battery-type communication device capable of easily and accurately detecting deterioration of the battery in a battery-type communication device such as a burst transmitter. It is to provide a voltage detection method.

[0005]

According to the present invention, in a battery type communication device for performing burst transmission using a battery power source, an analog-digital converter for converting a change in output potential difference of the battery into a digital signal, and There is provided a battery voltage detection circuit for a communication device, comprising: a monitor for monitoring a digital signal at both timings of the presence and absence of the burst transmission.

According to the present invention, in the battery voltage detection circuit of the communication device, the monitor means indicates that the digital signal is equal to or more than a predetermined potential difference,
A battery voltage detection circuit of a burst transmission device is provided, which is for instructing battery replacement.

According to the present invention, in a method of detecting deterioration of a battery of a battery-powered communication device which performs burst transmission, a change in output potential difference of the battery is converted into a digital signal, and the digital signal is detected whether or not burst transmission is performed. A battery voltage detection method for a burst transmission device, characterized in that the deterioration of the battery is detected based on the fact that the change in the output potential difference due to the presence / absence of the burst transmission gradually increases as time passes. can get.

[0008]

In the present invention, the analog-digital converter digitally converts the output potential difference signal of the battery. The control unit monitors the output signal of the analog-digital converter at both timings such as the presence / absence of burst transmission. Therefore,
The deterioration of the battery is not detected by monitoring the decrease in the battery voltage, but is detected based on the increase in the potential difference of the battery due to the increase in the internal resistance, which gradually increases with time.

[0009]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a block diagram showing a battery voltage detection circuit of a battery type communication device according to an embodiment of the present invention. A burst transmitter is illustrated here as a battery-powered communication device having two types of communication modes. As shown in FIG. 1, the battery voltage detection circuit is connected to the power supply line between the battery 1 including a rechargeable secondary battery such as a battery and the burst transmitter main body 10, and is an analog that indicates a change in the output voltage of the battery 1. An analog-to-digital converter (A / D converter) 2 for converting a signal into a digital signal, and a digital signal from the converter 2 which is connected to the A / D converter 2 and when the burst transmission is performed or stopped. It has a control unit 3 and a monitor 4 that monitor at both timings when the above. The control unit 3 and the monitor 4 together constitute a monitor means.

FIG. 2A is a diagram showing a burst transmission waveform, and FIG. 2B is a diagram showing battery voltage characteristics with and without burst transmission. Referring also to FIGS. 2A and 2B,
The operation of the battery voltage detection circuit of the burst transmitter of FIG. 1 will be described. As shown in FIG. 2A, there is a difference in the power used depending on the presence / absence of burst transmission output from the battery 1. This power difference appears as a potential difference change ΔV on both sides when the burst transmission is performed or when the burst transmission is stopped. As the battery deteriorates, the internal resistance increases, and the voltage as shown in FIG. This 2
The potential difference change ΔV of the seed voltage value is converted into a digital value by the analog-digital converter 2. Analog-
Change in potential difference ΔV (ΔV1, ΔV from digital converter 2)
.. .DELTA.Vn) is converted into a digital value by the analog-digital converter 2. The converted potential difference change ΔV is displayed on the monitor 4 by the control unit 3 at both timings with and without burst transmission, and when the voltage difference change ΔVb exceeds a predetermined value, the monitor 4 is instructed to replace the battery. .. In this case, an alarm device may give an alarm.

[0012]

As described above, according to the present invention, the potential difference change ΔV caused by the output of the battery in the presence / absence of the burst transmission of the battery type communication device for the burst transmission.
Therefore, it is possible to provide a battery voltage detection circuit and a battery voltage detection method for a battery-powered communication device that can easily detect deterioration of the battery due to an increase in internal resistance of the battery.

[Brief description of drawings]

FIG. 1 is a block diagram showing a battery voltage detection circuit of a battery-powered communication device according to an embodiment of the present invention.

FIG. 2A is a diagram showing a burst transmission waveform.
(B) is a diagram showing both battery voltage characteristics depending on the presence or absence of burst transmission.

FIG. 3 is a block diagram showing an example of a battery voltage detection circuit of a conventional battery-powered communication device.

[Explanation of symbols]

 1 Battery 2 Analog-Digital Converter 3 Control Unit 4 Monitor 10 Transmitter Main Unit 53 Voltage Monitoring Unit

Claims (3)

[Claims] 1. A battery-type communication device for performing burst transmission using a battery power supply, both an analog-digital converter for converting a change in output potential difference of the battery into a digital signal and the presence or absence of the burst transmission of the digital signal. A battery voltage detection circuit for a communication device, comprising: 2. The battery voltage detection circuit of the communication device according to claim 1, wherein the monitor means instructs battery replacement when the digital signal indicates that the digital signal is equal to or more than a predetermined potential difference. A battery voltage detection circuit of the burst transmitter characterized by the above. 3. A method for detecting deterioration of a battery of a battery-powered communication device that performs burst transmission, wherein the change in output potential difference of the battery is converted into a digital signal, and the digital signal is monitored at both timings of the presence and absence of burst transmission. A method for detecting a battery voltage in a burst transmitter, wherein the deterioration of the battery is detected based on that the change in the output potential difference due to the presence or absence of the burst transmission gradually increases with time.