POWER SUPPLY CONTROL DEVICE
First Claim
1. A power supply control device controlling power supplied to an device body, the device comprising:
- an always powered section coupled to an external power supply; and
a selectively powered section to which external power is supplied from the always powered section while the device body operates, whereinthe always powered section includesa switch configured to determine whether or not to supply the external power to the selectively powered section,a first memory circuit configured to store information for turning on/off the switch, and to set the information to information for turning on the switch when supply of the external power to the always powered section starts or when a main power supply switch for booting the device body is depressed, anda second memory circuit configured to store information on an on/off change of the main power supply switch, and to store information that there is no on/off change of the main power supply switch when the supply of the external power to the always powered section starts,the switch is turned on/off in accordance with the information in the first memory circuit,the selectively powered section includesa power supply circuit configured to generate the power from the external power supplied from the always powered section, and to supply the generated power to the device body,a non-volatile memory configured to store information on an on/off-state of the device body, anda control section configured to operate on the supplied power, to determine the on/off-state of the device body based on the information stored in the non-volatile memory and the information stored in the second memory circuit, and to change the information in the first memory circuit in accordance with a determination result.
3 Assignments
0 Petitions
Accused Products
Abstract
A power supply control device includes an always powered section and a selectively powered section. The always powered section includes a switch determining whether or not to supply external power to the selectively powered section, a first memory circuit storing information for turning on/off the switch, and a second memory circuit storing information on a change in a main power supply switch. The selectively powered section includes a power supply circuit supplying power to the device body, a non-volatile memory configured to storing information on an on/off-state of the device body, and a control section changing the information in the first memory circuit in accordance with the information in the non-volatile memory and the second memory circuit.
75 Citations
2 Claims
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1. A power supply control device controlling power supplied to an device body, the device comprising:
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an always powered section coupled to an external power supply; and a selectively powered section to which external power is supplied from the always powered section while the device body operates, wherein the always powered section includes a switch configured to determine whether or not to supply the external power to the selectively powered section, a first memory circuit configured to store information for turning on/off the switch, and to set the information to information for turning on the switch when supply of the external power to the always powered section starts or when a main power supply switch for booting the device body is depressed, and a second memory circuit configured to store information on an on/off change of the main power supply switch, and to store information that there is no on/off change of the main power supply switch when the supply of the external power to the always powered section starts, the switch is turned on/off in accordance with the information in the first memory circuit, the selectively powered section includes a power supply circuit configured to generate the power from the external power supplied from the always powered section, and to supply the generated power to the device body, a non-volatile memory configured to store information on an on/off-state of the device body, and a control section configured to operate on the supplied power, to determine the on/off-state of the device body based on the information stored in the non-volatile memory and the information stored in the second memory circuit, and to change the information in the first memory circuit in accordance with a determination result. - View Dependent Claims (2)
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Specification