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Electronic device

A technology of electronic equipment and equipment, applied in the direction of data reset device, etc., can solve the problems of not being able to ensure sufficient time to save data, not being able to delay reset, and the speed of power voltage drop is not fixed, etc.

Inactive Publication Date: 2010-09-22
MURATA MASCH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a problem that since the power supply voltage drop rate is not constant when the power is turned off, it is impossible to ensure sufficient time to save data by delaying the reset for a long time in consideration of reliably resetting the device.

Method used

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Examples

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Embodiment Construction

[0024] figure 1 It is a block diagram showing a configuration example of the electronic device 1 according to the embodiment of the present invention. This electronic device 1 includes a commercial power supply 10 , a power supply unit 11 , a DC (direct current) / DC converter (DC to DC converter) 20 , a first circuit block 100 , and a second circuit block 200 .

[0025] The power supply unit 11 converts the AC power supplied from the commercial power supply 10 into DC power, and is a constant voltage power supply of the voltage Vdd. The voltage Vdd of the normal power supply takes the voltage V0, and when the power supply is turned off, the power supply voltage VDD drops from the normal voltage V0. Here, it is assumed that the power supply unit 11 supplies power to the first circuit block 100 and the DC / DC converter 20 . The DC / DC converter 20 is a voltage conversion circuit that converts the voltage of the supplied electric power and outputs it to the second circuit block 20...

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PUM

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Abstract

The circuit block 100 preferably includes a reset signal generator 101, a reset signal generator 201, and a return reset signal generator 103. The reset signal generator 101 outputs a first reset signal when the power supply voltage Vdd lowers to a threshold voltage V1; the reset signal generator 201 outputs a second reset signal when the power supply voltage Vdd lowers to a threshold voltage V2 lower than the threshold voltage V1; adn the return reset signal generator 103 outputs the return reset signal when the output of the first reset signal is terminated. A saving unit 203 for saving the data starts the data storage based on the first reset signal and is reset based on the second reset signal. And, as the saving unit 203 is reset based on the return reset signal, the saving unit 203 of data is reset when the power supply voltage Vdd lowers to be lower than or equal to the threshold voltage V2. So that the abnormal movement during low voltage state can be prevented.

Description

technical field [0001] The present invention relates to electronic devices, and more particularly, to improvements in electronic devices that perform preprocess of resetting based on a drop in voltage of a power supply. Background technique [0002] A multi-functional device is an electronic device with multiple functions such as a printer, a fax machine, and a scanner. After starting the power supply of the multifunction device, the device is reset in order to prevent abnormal operation or damage of the device in the multifunction device in a low voltage state. Also, the device is reset when the power is cut off. [0003] The device is also reset when the power supply of the multifunction device is cut off due to a power failure or the like. However, if the hard disk drive of the multifunctional peripheral is immediately reset and the hard disk is stopped while it is in operation, the platter may collide with the reading head due to a subsequent impact and may be damaged....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F1/24
CPCG06F1/24
Inventor 西冈直树
Owner MURATA MASCH LTD