JPH05346832A - Power source control system for electronic equipment - Google Patents

Abstract

PURPOSE:To prevent a trouble which can not be recovered such as the stoppage of the operation of a CPU, or the volatilization of the content of a memory due to the delay of a power supply from an incorporated power source to an electronic equipment at the time of the disconnection of an attachable and detachable battery or an alternating current power source. CONSTITUTION:This system is equipped with a detecting means 18 which detects the connection state of a first power source 2. When the disconnection of the first power source 2 is detected, a driving power source is temporarily switched to a third auxiliary power source device 19, a DC-DC converter 17 which is operated by a second power source 16 is allowed to rise, and the driving power source is switched to the second power source 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multiple power source type electronic device having a plurality of types of driving power sources, and more particularly to a personal computer or a personal word processor having a battery or an AC power source as a driving power source.

[0002]

2. Description of the Related Art In recent years, personal computers or personal word processors have been remarkably widespread, and in particular, portable types, notebook types, laptop types, and palmtop types using a battery as a driving power source have been increasing in number.

In particular, in order to meet the needs of a wide range of users, many adopt an AC power source and a dual power source system which can be driven by a rechargeable secondary battery.

When a personal computer or a personal word processor is driven by a battery,
The problem is that the operating time per charge is short, so the operating speed of the device is somewhat sacrificed for battery drive, but the consumption such as slowing down the clock frequency and reducing the brightness of the display is required. A low power consumption mode with low power consumption and a high characteristic mode that places importance on the performance of the device for AC driving are provided, and the high characteristic mode and the low power consumption mode are switched and used according to the drive power source.

An example of automatic mode switching is disclosed in, for example, Japanese Unexamined Patent Publication No. 3-10962 having the configuration shown in FIG.
5 is mentioned.

In such a dual power source system, a power source detecting means 18 for determining whether or not the driving power source is the AC power source 2 is provided, and switching between the two modes is automatically performed by the switching means 15 based on the determination result of the power source detecting means 18. I am doing it.

[0007]

However, in the dual power source system as mentioned above, if the removable battery or the AC power source, which is the first driving power source 2, is suddenly disconnected without any notice, the first Detecting that the power supply connection detecting means 16 is disconnected, switching the electronic device to the low power consumption mode,
The drive power supply is switched to the second power supply device 16, the DC-DC converter 17 that operates at the second drive power supply voltage is started up, and power is supplied to the electronic device. The supply voltage of the electronic device has dropped and the CPU
Unrecoverable troubles such as the operation of the device being stopped and the contents of the memory being volatilized.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and in an electronic device using a removable battery or an AC power supply as a first driving power supply, the battery is a driving power supply. A second power supply device, and a third
Of the auxiliary power supply device and a detection means for detecting the connection state of the first power supply, and when it detects that the first power supply is not connected, the drive power supply is once switched to the third auxiliary power supply device. , Meanwhile DC-DC operating at the second power supply voltage
The converter is started up and switched from the third power supply to the second power supply.

[0009]

FIG. 1 shows an embodiment of the present invention (embodiment of claim 1).
2 and FIG. 2 (embodiment of claim 2).

In FIG. 1, reference numeral 1 is an electronic equipment main body, 2 is a first drive power source, which is a removable battery or AC power source, and the electronic equipment main body 1 is a first switching means 11 and a first switching means.
DC / DC converter 12, second switching means 13, electronic device 14 as a load, and power consumption switching means 1 of electronic device 14.
5, the second drive power supply 16, the second DC / DC converter 17, the power supply detection means 18, the third drive power supply 19, and the like.

The power source detecting means 18 detects the connection state of the first drive power source 2 and controls each switching means and the like.
The connection state of the first drive power supply 2 is detected by mechanically detecting the connection state of the connector or by a method such as voltage detection.

When it is detected that the first drive power source 2 is not connected, the first switching means 11 is controlled so that the power supply source to the first DC / DC converter 12 is instantly switched to the third drive power source 19. At the same time, the second DC / DC converter 17 is controlled so as to be in an operating state, and then the second switching means 13 is controlled so that the electric power supply source to the electronic device 14 as the load is the first DC / DC converter 12 To the second DC /
Switching to the DC converter 17, power consumption switching means 1
5, the electronic device 14 is switched to the low power consumption mode. Next, the first DC / DC converter 12 is switched to non-operation, and the third drive power supply 19 is made unloaded.

The load time of the third drive power source 19 is short, it is hardly consumed, and it may be shared with the second drive power source as in the second embodiment shown in FIG.

[0014]

Since the present invention is configured as described above, even if the removable battery or the AC power source, which is the first driving power source 2, is suddenly disconnected without any notice, the first power source can be used. Since the connection detecting means 16 detects the disconnection and instantly switches to the third drive power supply, the drive power supply is switched to the second power supply device 16 to operate at the second drive power supply voltage as in the conventional case. A series of operations such as starting up the DC-DC converter 17 to supply power to electronic equipment takes time,
In the meantime, the excellent effect that the unrecoverable trouble such as the supply voltage of the electronic device is lowered, the operation of the CPU is stopped, and the memory contents are volatilized is exerted.

[Brief description of drawings]

FIG. 1 is a circuit block diagram of a first embodiment.

FIG. 2 is a circuit block diagram of a second embodiment.

FIG. 3 is a circuit block diagram of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic device main body 11 1st switching means 12 1st DC / DC converter 13 2nd switching means 14 Electronic device which is a load 15 Electric power consumption switching means 16 2nd drive power supply 17 2nd DC / DC converter 18 Power supply Detection means 19 Third drive power supply 2 First drive power supply

Claims (2)

[Claims] 1. A first DC / DC which uses a removable battery or an AC power supply as a first drive power supply, a rechargeable battery as a second drive power supply, and each of the first and second drive power supplies as an input power supply. In an electronic device including a DC converter and a second DC / DC converter, a third drive power supply device and a connection detection unit for the first drive power supply are provided to disconnect the first drive power supply. Upon detection, the first drive power source is switched to the third drive power source, and then switched to the second drive power source. 2. The third drive power source is a rechargeable battery used for the second drive power source.
Power supply control method for the electronic device described.