Electronic apparatus and power supply device that switch between on-state and off-state

• US 8,760,130 B2
• Filed: 01/26/2011
• Issued: 06/24/2014
• Est. Priority Date: 01/29/2010
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamaguchi, Hideaki
• Primary Examiner(s): Berhane, Adolf
• Assistant Examiner(s): Mehari, Yemane
• Application Number:
  US13/014,675
• Publication Number:
  US 20110187440A1
• Time in Patent Office: 1,245 Days
• Field of Search: 323/220, 323/226, 323/265, 323/266, 323/273, 323/299, 363/34, 363/74, 363/123
• US Class Current: 323/265
• CPC Class Codes: H03K 17/60 the devices being bipolar transistors bipolar transistors having four or more electrodes H03K17/72

Abstract

The electronic apparatus includes a direct-current voltage generation part that generates a direct-current voltage from a commercial power supply; a switching part that switches between an on-state in which the direct-current voltage from the direct-current voltage generation part is output, and an off-state in which the output of the direct-current voltage is shut down, a control part that controls operation of the direct-current voltage generation part; and a power supply maintaining part connected to the direct-current voltage generation part, the power supply maintaining part instructing the switching part to be in the on-state or the off-state, and consequently, enables provision of a soft-switch electronic apparatus that after recovery of a power failure, automatically returns to a state before occurrence of the power failure.

Claims

1. An electronic apparatus comprising:

a power switch for starting up or shutting down the electronic apparatus;

a direct-current voltage generation part that outputs a direct-current voltage;

a control part that controls an operation of the electronic apparatus;

a switching part that switches between an on-state in which the direct-current voltage from the direct-current voltage generation part is supplied to the control part and an off-state in which the direct-current voltage is not supplied to the control part; and

a power supply maintaining part that maintains the switching part in the on-state during a predetermined period in a case where the alternating current voltage is supplied,

wherein in a case where the direct-current voltage is supplied to the control part by maintaining the switching part in the on-state, the control part detects whether the power switch is the on-state or the off-state, and

wherein in a case where the power switch is on, the control part controls the power supply maintaining part to maintain the switching part in the on-state, and in a case where the power switch is off, the control part controls the power supply maintaining part to maintain the switching part in the off-state.

2. An electronic apparatus according to claim 1, further comprising:

a memory that stores information regarding an operation status of the electronic apparatus,

wherein in a case where the information is stored in the memory, the control part controls the switching part so that the switching part is in off-state, and in a case where the information is not stored in the memory, the control part controls the switching part so that the switching part is in on-state.

3. A power supply device according to claim 1, wherein the electronic apparatus includes an image forming apparatus.

4. An electronic apparatus comprising:

a power switch for starting up or shutting down the electronic apparatus;

a direct-current voltage generation part that outputs a direct-current voltage;

a switching part that switches between an on-state in which the direct-current voltage from the direct-current voltage generation part is output, and an off-state in which the output of the direct-current voltage is shut down; and

a power supply maintaining part that maintains the switching part in the on-state during a predetermined period in a case where an alternating current is supplied,

wherein in a case where the direct-current voltage is supplied to a control part by maintaining the switching part in the on-state, the control part detects whether the power switch is the on-state or the off-state, and

wherein in a case where the power switch is on, the control part controls the power supply maintaining part to maintain the switching part in the on-state, and in a case where the power switch is off, the control part controls the power supply maintaining part to maintain the switching part in the off-state.

5. An electronic apparatus according to claim 4, further comprising:

a memory that stores information regarding an operation status of the electronic apparatus,

wherein in a case where the information is stored in the memory, the switching part is in the off-state, and in a case where the information is not stored in the memory, the switching part is in the on-state.

6. A power supply device that supplies power to an electronic apparatus, the power supply device comprising:

a direct-current voltage generation part that outputs a direct-current voltage;

a control part that controls an operation of the power supply;

a switching part that switches between an on-state in which the direct-current voltage from the direct-current voltage generation part is supplied to the control part and an off-state in which the direct-current voltage is not supplied to the control part; and

a power supply maintaining part that maintains the switching part in the on-state during a predetermined period in a case where the alternating current voltage is supplied,

wherein in a case where the direct-current voltage is supplied to the control part by maintaining the switching part in the on-state, the control part detects whether a power switch is the on-state or the off-state, and

wherein in a case where the power switch is on, the control part controls the power supply maintaining part to maintain the switching part in the on-state, and in a case where the power switch is off, the control part controls the power supply maintaining part to maintain the switching part in the off-state.

7. A power supply device according to claim 6, wherein the electronic apparatus further comprises:

a memory that stores information regarding an operation of the electronic apparatus, wherein in a case where the information is stored in the memory, the control part controls the switching part so that the switching part is in the off-state, and in a case where the information is not stored in the memory, the control part controls the switching part so that the switching part is in the on-state.

8. A power supply device according to claim 6, wherein the electronic apparatus includes an image forming apparatus.