JPH10187292A - Battery pack and its switching circuit system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery switching circuit system capable of preventing power interruption due to sudden battery detachment and to provide a battery pack utilizing the circuit system with respect to a personal computer or an information processing system capable of loading two batteries. SOLUTION: The system has 1st and 2nd batteries 17, 18, an FET 1 is controlled by both of a discharge switching signal (1st battery drive signal (c)) based on system control and a switching signal (2nd battery detachment detection signal (b)) due to detachment, turned on at the time of switching the system to the 1st battery 17 and turned off at the time of switching the system to the 2nd battery 18. An FET 9 is controlled by both of a discharge switching signal (2nd battery drive signal (d)) based on system control and a switching signal (1st battery detachment detection signal (a)) due to battery detachment, turned on at the time of switching the system to the 2nd battery 18 and turned off at the time of switching the system to the 1st battery 17 to switch the 1st and 2nd batteries 17, 18.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a battery pack and a switching circuit thereof, and more particularly, to a battery pack of a personal computer and an information processing system on which two sets of batteries can be mounted and a switching circuit thereof.

[0002]

2. Description of the Related Art In a battery pack used in a personal computer and an information processing system that emphasizes portability, when two sets of battery packs are mounted and used by switching discharges, a conventional discharge circuit requires the discharge of each battery pack. A switch is provided by providing a switch in the circuit.

In this conventional discharge circuit, the first battery pack becomes empty, and to switch to the second battery pack, the discharge circuit is switched by the control circuit of the system and the second battery pack is switched to the second battery pack.
When the battery pack was being discharged, but the user accidentally detached the second battery pack in use, the control circuit of the system could not respond to the sudden detachment, and the power supply was suddenly shut off during processing. was there.

Next, the operation will be described with reference to the drawings.

FIG. 3 is a block diagram showing an example of a conventional battery back switching circuit system.

Normally, when the system is in use with two sets of batteries mounted, the battery pack is driven from the first battery pack 17, and when empty, the drive is switched to the second battery pack 18 for use. It is assumed that

First, the microprocessor of the system is:
In order to drive the first battery pack 17, the first battery drive signal c is turned on to supply power to the load.

At this time, it is assumed that the microprocessor turns off the second battery drive signal d and supplies only the first battery pack 17 to the load. If the user unexpectedly removes or attaches the first battery pack 17 in this state, the system connected to the load will shut down. Conventional first
The battery detachment detection signal a is directly input to the microprocessor of the system, whereby it is determined that the first battery pack is connected. However, it is determined that the first battery pack is disconnected by driving the second battery pack. I was limited when I was.

[0009]

The first problem is that data cannot be protected during the operation of the system due to accidental detachment because it cannot usually be judged that the connection has been removed.

[0010] The reason is that the power supply state of the system is controlled by a one-chip microprocessor to detect the detachment, and therefore, the processing time for switching the discharge circuit upon detecting the unexpected detachment becomes longer, and the time before the power supply is switched is increased. This is because it is shut off.

[0011]

SUMMARY OF THE INVENTION An object of the present invention is to provide a battery pack and a switching circuit system for a personal computer or a portable terminal device on which two sets of battery packs can be mounted, which prevent the power supply from being unexpectedly shut off due to the detachment of the battery pack. To provide.

Therefore, (1) The battery pack switching circuit system according to the present invention is a personal computer and an information processing system in which two sets of battery packs are mounted and used by switching discharges. Is characterized by having a circuit for switching to another battery pack without shutting off the power supply of the system. (2) The battery pack of the present invention is characterized in that, in a battery pack used for a personal computer and an information processing system, when the battery pack is detached, the detachment detection terminal is separated before other terminals. (3) The battery pack switching circuit system according to the present invention is a battery pack switching circuit system for switching between a first battery pack and a second battery pack, and is a discharge switching signal (first battery drive signal) controlled by a microprocessor of the system.
And the switching signal by detachment (detection of detachment of the second battery), and when switching to the first battery pack, O
N, a first FET that is turned off when switching to the second battery pack, and a discharge switching signal (second battery pack drive signal) controlled by the microprocessor of the system.
And switching signal due to attachment / detachment (detection of attachment / detachment of first battery pack)
And ON when switching to the second battery pack, and O when switching to the first battery pack.
And a second FET to be an FF. (3) In the battery pack of the present invention, the first battery pack or the second battery pack is detached from the battery back having the battery pack switching circuit for switching between the first battery pack and the second battery pack according to the above (3). In this case, the first FET or the second FET has a structure in which a detachment detection terminal of the first FET or the other FET is separated earlier than a detachment detection terminal of another FET.

[0013]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a battery back switching circuit system of the present invention, and FIG. 2 is a block diagram showing a battery pack connection terminal portion of the battery back switching circuit system of the present invention.

Referring to FIG. 1, the circuit system of the present embodiment has a first battery pack 17 and a second battery pack 18.

The first battery pack 17 has discharge terminals + and-.
In addition to the common terminal, a first battery detachment detection terminal A (for the first battery detachment detection signal a) is provided. The FET 1 and the diode 2 are connected to a discharge path from the discharge terminal + of the first battery pack 17 to the load. When the first battery pack 17 supplies power to the load, the FET 3 is turned on. By enabling the first battery drive signal c for the gate of the FET 5 via the resistor 4, the FET 5 is turned on and the resistor 3
Then, the voltage divided by the resistor 4 is input to the gate of the FET1, and the FET1 is turned on to discharge the power of the first battery pack 17 to the load. Thereafter, when the power of the first battery pack 17 becomes empty and switching to the second battery pack 18 is performed, the second battery drive signal d first output from the microprocessor becomes valid, and the FET 13 is turned on. At that time, the voltage divided by the resistor 11 and the resistor 12
9 is input to the gate of FET 9 and FET 9 is turned ON. Next, the microprocessor turns off the FET 5 to invalidate the first battery drive signal c, the voltage between the gate and the source of the FET 1 becomes 0 V, and the FET 1 turns off to
The discharge path of the battery pack 17 is cut off. The operation of the FET 1 under each control in this case is shown in the following table.

[0017]

The second battery pack 18 has a second battery pack detachment detection terminal B (for the second battery pack detachment detection signal b) in addition to the discharge terminals + and-as in the first battery pack.
An FET 9 and a diode 10 are connected to a discharge path from the discharge terminal + of the second battery pack 18 to the load. When the second battery pack 18 supplies power to the load, the FET 9 is turned on. FET via resistor 12
By making the second battery drive signal d valid at the gate of the FET 13, the FET 13 is turned ON, and the voltage divided by the resistors 11 and 12 is input to the gate of the FET 9,
9 turns ON, and the electric power of the second battery pack 18 is discharged to the load. Thereafter, when the power of the second battery pack 18 becomes empty and switching to the first battery pack 17 is performed, the first battery drive signal c first output from the microprocessor becomes valid, and the FET 5 is turned on. At that time, resistance 3
And the voltage divided by the resistor 4 is input to the gate of the FET1, and the FET1 is turned ON. Next, the microprocessor turns off the FET 13 to invalidate the second battery drive signal d.
F, the voltage between the gate and the source of the FET 9 becomes 0 V, the FET 9 is turned off, and the discharge path of the second battery pack 18 is cut off. The operation of the FET 9 by each control in this case is shown in the following table.

[0019]

Next, the operation of the circuit in the switching circuit system of the present embodiment will be described with reference to FIGS.

Normally, when the system is in use with two sets of batteries mounted, the battery pack is driven from the first battery pack 17 and switched to the second battery pack 18 when the battery pack becomes empty. It is assumed that

First, the microprocessor of the system is:
In order to drive the first battery pack 17, the first battery drive signal c is turned on to supply power to the load.

At this time, it is assumed that the microprocessor turns off the second battery drive signal d and supplies only the first battery pack 17 to the load. In this state, as shown in FIG. 2, when the user unexpectedly removes and attaches the first battery pack 17, the first battery detachment detection terminal A separates from the drive terminal + before the first battery detachment detection signal a. Is released from the ground level, and the gate voltage of the FET 16 is
To the voltage of the second battery pack connected to the second battery pack. As a result, the FET 16 is turned on, and the voltage divided by the resistors 11 and 15 is input to the gate of the FET 9 and
9 is turned on, and the driving is switched to the driving of the second battery pack 18.

Next, the operation during driving of the second battery pack 18 will be described.

At this time, it is assumed that the microprocessor turns off the first battery drive signal c, validates only the second battery drive signal d, and supplies power from the second battery pack 18 to the load. In this state, as shown in FIG. 2, when the user unexpectedly removes and attaches the second battery pack 18, the second battery detachment detection terminal B separates before the drive terminal +, so that the second battery detachment detection signal b Is released from the ground level, and the gate voltage of the FET 8 rises to the voltage of the first battery pack 17 connected to the resistor 6. Thereby, F
ET8 is turned on, the voltage divided by the resistors 3 and 7 is input to the gate of the FET1, and the FET1 is turned on to switch to driving the first battery pack 17.

[0026]

The first effect is that data during operation of the system can be protected even if the battery bag is unexpectedly attached / detached.

The reason is that even if the battery bag being driven is attached or detached, the system can be driven without interruption of power supply by instantaneously switching to another battery bag, and data during system operation can be protected. .

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing one embodiment of a battery back switching circuit system of the present invention.

FIG. 2 is a configuration diagram illustrating a battery pack connection terminal unit of a battery back switching circuit type according to the present invention.

FIG. 3 is a configuration diagram showing an example of a conventional battery back switching circuit system.

[Explanation of symbols]

 1, 5, 8, 9, 13, 16 FET 2,10 Diode 3,4,6,7,11,12,14,15 Resistance 17 First battery pack 18 Second battery pack A First battery detachment detection terminal B Second battery detachment detection terminal a First battery detachment detection signal b Second battery detachment detection signal c First battery drive signal d Second battery drive signal

Claims (4)

[Claims] 1. A personal computer and an information processing system in which two sets of battery packs are mounted and used by switching discharges, wherein even if a battery pack being driven is attached or detached, the power supply of the system is not interrupted and the other battery packs are connected. A switching circuit system for a battery pack, comprising a switching circuit. 2. A battery pack used in a personal computer and an information processing system, wherein a detachment detection terminal is separated from other terminals before detachment when detached. 3. In a battery pack switching circuit system for switching between a first battery pack and a second battery pack, a discharge switching signal (first battery drive signal) controlled by a microprocessor of the system and a switching signal (second battery drive signal) by detachment.
The first FET is turned on when switching to the first battery pack, turned off when switching to the second battery pack, and a discharge switching signal (microprocessor-controlled by the system). Second
The battery pack drive signal) and the switching signal (1st
And a second FET that is turned on when switching to the second battery pack and turned off when switching to the first battery pack. Switching circuit method. 4. The battery pack according to claim 3, further comprising a battery pack switching circuit for switching between the first battery pack and the second battery pack, wherein the first battery pack or the second battery pack is detached. A battery bag having a structure in which a desorption detection terminal of a first FET or a second FET is separated earlier than a desorption detection terminal of another FET.