JPH057175A - Battery changeover system - Google Patents

Abstract

PURPOSE:To always keep a battery in the radio communication enable state by continuing radio communication without replacement of a battery and charging even when a main battery is worn on the way of radio communication based on a noticed number of communication enable times. CONSTITUTION:A voltage level of a main battery 2 is dropped after lapse of an operating time of a radio equipment and when the level reaches an operation limit level Ve of a radio section/control section 1, a CHK 5 is activated and switches 11,12 are thrown to the position shown in solid lines via a SW 4 by an interface section 10 to supply power to the radio section/control section from the switched sub battery 3. As soon as the power source is switched from the main battery 2 to the sub battery 3, the CHK 5 uses an interface 9 to inform it to the radio section/control section 1 that the battery supply is changed over. The radio section/control section 1 receiving the notice displays number of radio communication enable times for the sub battery 3 onto a display section 14 to inform it to the operator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery switching system, and more particularly to a battery switching system in a portable radio.

[0002]

2. Description of the Related Art In a conventional portable wireless device using a battery, when the voltage level of the battery drops to a level where wireless communication is impossible during wireless communication, the battery is replaced or charged and then the wireless communication is performed again. I was communicating.
Also, the operator could not know in advance when to replace or charge the battery.

[0003]

In this conventional portable wireless device using a battery, when the voltage level of the battery drops to a level where wireless communication is impossible during wireless communication, battery replacement or charging is required. Since there was a problem that the operator had to perform wireless communication again after the operation, and the operator could not know in advance when the battery had to be replaced or charged, the operator could perform wireless communication without noticing the decrease in the battery voltage level. However, there is a problem that the voltage level of the battery drops to a level where wireless communication is impossible during wireless communication, and wireless communication cannot be performed normally.

[0004]

A battery switching system of the present invention is a battery voltage level check means for monitoring the voltage level of the main battery in a portable radio device equipped with a main battery and a sub battery, and the voltage level. And a switching means for automatically switching and connecting the main battery to the sub-battery when the battery level drops to a level where wireless communication is not possible.

A notification means may be provided for notifying the number of times wireless communication is possible with the sub battery when the main battery is switched to the sub battery. A connection changing means may be provided for connecting the main battery and the sub-battery in series to supply a voltage to the portable wireless device when it reaches zero.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a portable wireless device showing an embodiment of the present invention.

The portable radio device of this embodiment has a radio unit / control unit 1, a main battery 2, a sub battery 3, and a switch (hereinafter SW) 4 for switching the sub battery 3 to a battery.
And battery voltage level check circuit (CHK) 5
And a power supply interface 6 to the wireless unit / control unit 1.
And a power supply interface 7 for the main battery 2,
The power supply interface 8 for the sub-battery 3, the interface 9 for notifying the wireless unit / control unit 1 of the voltage level drop of the battery, the interface 10 for controlling the SW 4, the + pole of the main battery 2, and the sub-battery 3
The switch 11 for connecting the negative pole of the sub battery 3, the switch 12 for connecting the negative pole of the sub-battery 3 and GND, and the key switch 13 for the operator to operate when necessary.

Next, the operation of this embodiment will be described.
FIG. 2 is a diagram showing an example of voltage levels determined by the power supply interface in FIG.

First, the radio unit / control unit 1 is operated by being supplied with power from the main battery 2, but the voltage level of the main battery 2 decreases after a lapse of operating time, and the operation limit of the radio unit / control unit 1 is reached. When the level Ve is reached, the CHK 5 operates, and the interface 10 brings the switches 11 and 12 through the SW 4 into the states shown by the solid lines, whereby the wireless unit / control unit is supplied with power from the switched sub-battery 3. At the same time that the voltage supply source is switched from the main battery 2 to the sub-battery 3, the CHK 5 uses the interface 9 to notify the wireless unit / control unit 1 that the battery has been switched. Upon receiving the notification, the wireless unit / control unit 1 displays the number of times wireless communication is possible on the sub-battery 3 on the display unit 14 to notify the operator.

Next, the voltage level of the main battery 2 has already reached the operation limit level Ve of the radio section / control section 1, and the sub battery 3 is continuously used while the voltage supply source is switched. When the voltage level of 3 also reaches the operation limit level Ve of the wireless unit / control unit 1, CHK
5 operates to notify the wireless unit / control unit 1 using the interface 9. The notified wireless unit / control unit 1 notifies the operator. In this state, the operator must
When the operator wants to perform wireless communication only once, the operator presses the key switch 13 to bring it into the state shown by the broken line. Then,
The wireless unit / control unit 1 disconnects the switch 12 (shown by a broken line) and connects the switch 11 (shown by a broken line). By this operation, the main battery 2 and the sub-battery 3 are connected in series, the voltage level supplied to the wireless unit / control unit 1 reaches the operable level, and the wireless unit / control unit 1 performs the wireless communication operation only once. You can

[0011]

As described above, according to the present invention, even if the main battery runs out during wireless communication, it automatically switches to the sub-battery. Therefore, the battery can be continued without being replaced or charged. Wireless communication can be performed. Further, since the operator is notified of the number of times wireless communication is possible, it is possible to know when to replace or charge the battery, and it is possible to always keep the state of the battery wirelessly communicable. Furthermore, since the main battery and the sub-battery are set to enable wireless communication only once at the end even when the wireless communication is not possible, when the wireless communication is mistakenly performed while knowing the battery status. Or, there is an effect that it is possible to meet the demand of the operator who wants to communicate only once at the end.

[Brief description of drawings]

FIG. 1 is a block diagram of a portable wireless device showing an embodiment of the present invention.

FIG. 2 is a diagram showing an example of voltage levels measured by a power supply interface in FIG.

[Explanation of symbols]

1 Wireless unit / control unit 2 main battery 3 sub battery 4 Changeover switch (SW) 5 Battery voltage level check circuit (CHK) 11,12 switch 13 key switch 14 Display

Claims (3)

[Claims] 1. A battery voltage level check means for monitoring a voltage level of the main battery in a portable wireless device equipped with a main battery and a sub battery; and when the voltage level is lowered to a level at which wireless communication is impossible. And a switching means for automatically switching and connecting a main battery to the sub-battery. 2. The battery switching system according to claim 1, further comprising notification means for notifying the number of times wireless communication is possible with the sub battery when the main battery is switched to the sub battery. 3. A connection changing means for connecting the main battery and the sub-battery in series to supply a voltage to the portable radio when the number of times the sub-battery can be wirelessly communicated reaches zero. The battery switching system according to claim 2, wherein: