JPH06332586A - Power source protection circuit - Google Patents

Abstract

PURPOSE:To protect internal data of an equipment by saving the present operation state in a storage medium in operating the power source protection circuit. CONSTITUTION:When the protection circuit of a main power source 11 is operated, a protection circuit operation signal (PROTECT) becomes active. Then, the power supply is switched to an auxiliary power supply 13 and the main power supply 11 is turned off and the data required to reproduce the operation state of the present equipment recorded on a main memory are stored in a storage medium 15 such as magnetic disk or the like and the auxiliary power supply 13 is also stopped. When the abnormality of the main power supply is prevented and the operation of the protection circuit is stopped and the power is supplied again, the operation of the equipment is restarted, the state of the equipment is returned to just before the operation of the protection circuit is started.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply protection circuit used in information equipment and the like.

[0002]

2. Description of the Related Art In the prior art, in an information device or the like which uses a main power supply built into a device and an external voltage conversion adapter, when the internal protection circuit of the main power supply and the voltage conversion adapter operates, the output is forcibly forced. By stopping it, it was avoided that the abnormal state would continue and become dangerous.

[0003]

However, in the above-mentioned prior art, since the outputs of the main power supply and the power conversion adapter are forcibly stopped, the operating status of the device is stored in the internal electric memory of the information device or the like. In a device or the like in which the data represented is temporarily stored, there is a problem in that the data is lost when the device is not supplied with power. The present invention is to solve the above conventional problems,
It is an object of the present invention to provide a power protection circuit that protects internal data of equipment.

[0004]

In order to achieve the above object, the present invention switches to an auxiliary power supply immediately before the output of the main power supply is forcibly stopped, and the internal data of the device is operated while the auxiliary power supply is operating. The internal data of the device is retained by saving the data in the storage medium.

[0005]

Function: A signal notifying the operation of the main power supply protection circuit is sent to the main board of the device immediately before the main power supply protection circuit operates. At this time, the main power source is turned off instantly by switching to the auxiliary power source. The internal data of the device is saved in the storage medium while the auxiliary power supply is operating. After that, the auxiliary power supply is stopped. With the above operation, the operation status of the device immediately before the protection circuit of the main power supply operates can be held. Even in the case of the voltage conversion adapter, the operation status of the device can be maintained by performing the same sequence operation.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the configuration of a power supply protection circuit according to the first embodiment of the present invention. In FIG.
11 is the main power supply, 12 is the power supply selector, 13 is the auxiliary power supply, 14
Is a main board, 15 is a storage medium, and 16 is an indicator.

When an abnormal state occurs inside the main power supply 11, the main power supply protection circuit operation signal (PROTECT) becomes active and is supplied to the main board 14 immediately before the protection circuit of the main power supply 11 operates. The power source is switched to the auxiliary power source 13 by the power source selector 12. At the same time,
Alternatively, the main power supply 11 is stopped after a certain time. After that, the data necessary for reproducing the current operating condition of the device, which is recorded in the hardware register or the main memory, is saved in the storage medium 15 such as a magnetic disk.
After the evacuation is completed, the auxiliary power supply 13 also stops and the operation of the device also stops. Here, in the mode where the main power supply 11 can operate normally, if the indicator 16 is attached so that the LED (light emitting diode) etc. lights up when the input of the main power supply 11 is turned on and the protection circuit operates, the main power supply 11 You can check whether 11 is abnormal. After that, by removing the cause of the operation of the protection circuit and turning on the output of the main power supply 11 again after the main power supply 11 can operate normally, the data saved in the storage medium 15 is returned to the original memory or register. By returning it, it is possible to return to the operation state of the device immediately before the operation of the main power supply protection circuit. The main power supply
When the protection circuit operates except for the abnormalities in 11, there is a risk of damage to the equipment. In order to avoid this, it is only necessary to take measures to incorporate a protection circuit in the power supply selector 12.

FIG. 2 shows the configuration of the power supply protection circuit according to the second embodiment of the present invention, which is the case of a device using an external voltage conversion adapter. Currently, many devices of this type support battery operation. In FIG. 2, 12 is a power source selector, 14 is a main board, 15 is a storage medium, 16 is an indicator, 17 is a voltage conversion adapter, and 18 is a battery.

The power selector 12 receives the PROTECT signal immediately before the protection circuit inside the voltage conversion adapter 17 operates, and the power selector 12 switches to the battery 18. On the other hand, the voltage conversion adapter 17 is turned off, and the PROTECT signal indicator 16 attached to the device disappears.
At this time, the user of the device can visually determine that the power conversion adapter 17 has an abnormality and the protection circuit has operated.
Even if the indicator 16 disappears, the internal battery 1
It can be driven for a while with 8, but then the internal battery 18
When the low voltage is detected and a low voltage is detected, it is necessary to reproduce the current operating condition of the device stored in the hardware register or the main memory as in the case of the first embodiment. Recording data such as magnetic disks 15
To evacuate. After removing the cause of operation of the protection circuit, when the output of the power conversion adapter 17 is turned on again and the device is activated, the saved data is restored and the state immediately before the operation of the protection circuit is restored.

FIG. 3 shows a case where the built-in battery is used alone. When the low voltage of the battery 18 is detected by the low voltage detection 19, the indicator 16 disappears.
On the other hand, the operating state is retained by saving data representing the operating state of the device such as hardware and memory contents in the storage medium 15 such as a magnetic disk. When voltage is supplied by replacing the battery and the equipment starts up, the saved data is restored and the original state is restored. In addition to the magnetic disk and the optical disk, all the media for storing information can be used as the storage medium.

[0011]

As is apparent from the above embodiments, since the operating state of the device can be held even when the power protection circuit operates, there is an effect that valuable data input to the device can also be held. .

[Brief description of drawings]

FIG. 1 is a block diagram of a power supply protection circuit according to a first embodiment of the present invention.

FIG. 2 is a block diagram of a power supply protection circuit according to a second embodiment of the present invention.

FIG. 3 is a block diagram when the built-in battery alone is used in the present invention.

[Explanation of symbols]

11 ... Main power supply, 12 ... Power supply selector, 13 ... Auxiliary power supply, 14 ... Main board, 15 ... Storage medium, 16 ... Indicator, 17 ... Voltage conversion adapter, 18 ... Battery, 19 ... Low voltage detection.

Claims (3)

[Claims] 1. A device comprising a main power supply and an auxiliary power supply, and a power supply selector for switching between the main power supply and the auxiliary power supply, wherein a main power supply protection circuit operates when an abnormal state occurs inside the main power supply. Just before the main power supply protection circuit operation signal sent from the main power supply circuit, the power supply is switched to the auxiliary power supply inside the equipment, and while the auxiliary power supply is operating, the data necessary to reproduce the current operating status is A power supply protection circuit characterized by being saved in a storage medium. 2. A device that uses a battery built-in adapter that is attached to the outside to be used, and immediately before the internal protection circuit of the adapter operates, a signal from the adapter is sent to notify the operation of the power protection circuit. The power supply protection circuit is characterized in that the data necessary for reproducing the current operation status is saved in the storage medium while the internal battery is operating. 3. In a device with a built-in battery, when a low voltage detection circuit of the battery detects a low voltage, data necessary for reproducing the current operating condition is saved in a storage medium such as a magnetic disk. And a power protection circuit.