IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0518943
(2006-09-12)
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등록번호 |
US-8736861
(2014-05-27)
|
우선권정보 |
JP-2005-264412 (2005-09-12); JP-2005-264413 (2005-09-12); JP-2006-184778 (2006-07-04) |
발명자
/ 주소 |
- Sato, Naoki
- Kikuchi, Hideo
- Nakaya, Masahide
|
출원인 / 주소 |
|
대리인 / 주소 |
Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
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인용정보 |
피인용 횟수 :
2 인용 특허 :
21 |
초록
▼
An image forming apparatus is disclosed that includes a power storage unit. The power storage unit includes a constant voltage generation part configured to generate a constant voltage from a commercial power supply, the constant voltage generation part being connected to an external apparatus opera
An image forming apparatus is disclosed that includes a power storage unit. The power storage unit includes a constant voltage generation part configured to generate a constant voltage from a commercial power supply, the constant voltage generation part being connected to an external apparatus operating by consuming power; a voltage increasing circuit configured to increase the constant voltage generated by the constant voltage generation part; a capacitor configured to store an electric charge supplied from the voltage increasing circuit; a circuit control part configured to control charging of the capacitor; and an output part configured to output power stored in the capacitor, the power having a voltage different from the constant voltage.
대표청구항
▼
1. An image forming apparatus, comprising: a radiating load that operates, by radiating, by consuming power at a first voltage;a power storage unit including a power supply generation circuit to provide a power supply of one of a constant current, constant power, and a constant voltage from a commer
1. An image forming apparatus, comprising: a radiating load that operates, by radiating, by consuming power at a first voltage;a power storage unit including a power supply generation circuit to provide a power supply of one of a constant current, constant power, and a constant voltage from a commercial power supply to a main body load;a capacitor bank including a plurality of capacitors, the capacitor bank storing an electric charge supplied from the power supply generation circuit;a circuit control part to control charging of the capacitor bank;a voltage changing part to change a voltage supplied from the capacitor bank; andan output part to output power having a voltage thereof changed by the voltage changing part to the radiating load, such that the radiating load operates by consuming power at the first voltage, whereinthe power storage unit further comprises a charge voltage detection circuit to detect a charge voltage of the capacitor bank,the capacitor bank includes two ends and each of the two ends is connected to the charge voltage detection circuit,the image forming apparatus further comprises the main body load, which is connected in parallel to the capacitor bank by a switch that, when closed, causes the capacitor bank to charge by the power supply generation circuit, andthe circuit control part controls charging of the capacitor bank by closing and opening the switch based on an amount of radiating of the radiating load. 2. The image forming apparatus as claimed in claim 1, wherein the power storage unit further comprises one of: an opening and closing circuit to open and close a connection between the power supply generation circuit and the capacitor bank, the opening and closing circuit connecting the power supply generation circuit to the radiating load when the opening and closing circuit is open and to the capacitor bank when the opening and closing circuit is closed; anda switching circuit to switch a connection destination of the power supply generation circuit from the radiating load to the capacitor bank. 3. The image forming apparatus as claimed in claim 2, wherein if the opening and closing circuit is opened or the switching circuit is caused to switch to the radiating load, the circuit control part performs control so that the power supply generation circuit outputs a predetermined constant voltage. 4. The image forming apparatus as claimed in claim 2, wherein: the power supply generation circuit performs one of constant current charging and constant power charging on the capacitor bank when the opening and closing circuit is closed or the switching circuit is caused to switch to a side of the capacitor bank; andan output of the power supply generation circuit is caused to be a constant voltage when the opening and closing circuit is opened or the switching circuit is caused to switch to a side of the image forming apparatus. 5. The image forming apparatus as claimed in claim 1, wherein: the power storage unit further comprises a communications part to perform communications with a control part of the image forming apparatus; andthe circuit control part charges the capacitor bank on receiving a charging enabling signal indicating that it is possible to charge the capacitor bank. 6. The image forming apparatus as claimed in claim 5, wherein: the voltage changing part includes one of a boost chopper circuit and an isolation transformer connected to the capacitor bank; andthe circuit control part outputs a pulse signal with a predetermined duty ratio, the pulse signal switching the one of the boost chopper circuit and the isolation transformer. 7. The image forming apparatus as claimed in claim 6, wherein: the voltage changing part includes a changed voltage detection circuit to detect the changed voltage; andthe pulse signal is controlled so that the duty ratio thereof gradually changes, based on the changed voltage detected by the changed voltage detection circuit. 8. The image forming apparatus as claimed in claim 6, wherein: the circuit control part includes a storage part to store duty control information transmitted from the control part of the image forming apparatus, the duty control information controlling the duty ratio of the pulse signal; andthe circuit control part controls the duty ratio of the pulse signal based on the duty control information. 9. The image forming apparatus as claimed in claim 6, wherein the circuit control part controls the duty ratio of the pulse signal without causing the changed voltage detected by the changed voltage detection circuit to exceed a preset predetermined limit voltage. 10. The image forming apparatus as claimed in claim 5, wherein: the voltage changing part includes one of a boost chopper circuit and an isolation transformer connected to the capacitor bank; andthe one of the boost chopper circuit and the isolation transformer is switched by a pulse signal having a predetermined duty ratio based on a signal transmitted from the control part of the image forming apparatus. 11. The image forming apparatus as claimed in claim 10, wherein: the voltage changing part includes an changed voltage detection circuit to detect the changed voltage; andthe pulse signal is controlled so that the duty ratio thereof gradually changes, based on the changed voltage detected by the changed voltage detection circuit. 12. The image forming apparatus as claimed in claim 5, wherein: the voltage changing part includes one of a boost chopper circuit and an isolation transformer connected to the capacitor bank;the circuit control part outputs a pulse signal to the voltage changing part through an AND circuit, the pulse signal switching the one of the boost chopper circuit and the isolation transformer; andON/OFF control is performed on the AND circuit based on a signal fed from the control part of the image forming apparatus. 13. The image forming apparatus as claimed in claim 12, wherein: the voltage changing part includes an changed voltage detection circuit to detect the changed voltage; andthe pulse signal is controlled so that the duty ratio thereof gradually changes, based on the changed voltage detected by the changed voltage detection circuit. 14. The image forming apparatus as claimed in claim 1, wherein the circuit control part increases the voltage supplied from the capacitor bank when the charge voltage of the capacitor bank detected by the charge voltage detection circuit is higher than or equal to a predetermined value. 15. The image forming apparatus as claimed in claim 1, wherein the circuit control part starts to increase the voltage on receiving, from a control part of the image forming apparatus, a signal to instruct a voltage increasing operation to be started, and ends the increasing of the voltage on receiving a signal to instruct the voltage increasing operation to be ended. 16. The image forming apparatus as claimed in claim 1, wherein when a temperature of a heating part controlled by a control part of the image forming apparatus is lower than or equal to a predetermined value, power of the capacitor bank is supplied to the heating part based on a signal fed from a control part of the radiating load. 17. The image forming apparatus as claimed in claim 1, wherein: the voltage changing part is to increase the voltage supplied from the capacitor bank; andthe output part is to output power having a voltage thereof increased by the voltage changing part to the radiating load, such that the radiating load operates by consuming power at the first voltage. 18. The image forming apparatus as claimed in claim 1, wherein the radiating load is a heater. 19. The image forming apparatus as claimed in claim 1, further comprising: an operating condition detection circuit to detect an amount of radiating of the radiating load, whereinthe circuit control part controls charging of the capacitor bank by closing and opening the switch based on the amount of radiating of the radiating load detected by the operating condition detection circuit. 20. The image forming apparatus as claimed in claim 19, wherein the radiating load is a heater, and the operating condition detection circuit is a temperature detection circuit. 21. The image forming apparatus as claimed in claim 19, wherein the main body load includes one or more of a clutch, a solenoid, a motor, and a sensor to perform an image forming operation. 22. The image forming apparatus as claimed in claim 19, wherein the main body load and radiating load operate at different voltages. 23. An image forming apparatus, comprising: a radiating load that operates, by radiating, by consuming power at a first voltage;a power storage unit including a power supply generation circuit to provide a power supply of one of a constant current, constant power, and a constant voltage from a commercial power supply to a main body load;a capacitor bank including a plurality of capacitors, the capacitor bank storing an electric charge supplied from the power supply generation circuit;a circuit control part to control charging of the capacitor bank;a voltage changing part to change a voltage supplied from the capacitor bank; andan output part to output power having a voltage thereof changed by the voltage changing part to the radiating load, such that the radiating load operates by consuming power at the first voltage, wherein:the power storage unit further comprises a charge voltage detection circuit to detect a charge voltage of the capacitor bank;the capacitor bank includes two ends and each of the two ends is connected to the charge voltage detection circuit;the voltage changing part to change the voltage supplied from the capacitor bank includes a primary coil, a secondary coil, and a transistor in series with one of the primary and secondary coils that switches on and off to change the voltage supplied from the capacitor bank by changing a conduction period;the output part includes a rectification and smoothing circuit to rectify and smooth an output of the voltage changing part that is output to the radiating load; andthe primary and secondary coils separate the radiating load from the main body load. 24. An image forming apparatus, comprising: a radiating load that operates, by radiating, by consuming power at a first voltage;a power supply generation circuit to provide a power supply of one of a constant current, constant power, and a constant voltage from a commercial power supply to a main body load;a capacitor bank including a plurality of capacitors, the capacitor bank storing an electric charge supplied from the power supply generation circuit;a control circuit to control charging of the capacitor bank;a voltage changing part to change a voltage supplied from the capacitor bank;an output circuit to output power having a voltage thereof changed by the voltage changing part to the radiating load, such that the radiating load operates by consuming power at the first voltage; anda charge voltage detection circuit to detect a charge voltage of the capacitor bank, whereinthe capacitor bank includes two ends and each of the two ends is connected to the charge voltage detection circuit,the main body load is to be connected in parallel to the capacitor bank by a switch that, when closed, causes the capacitor bank to charge by the power supply generation circuit, andthe control circuit is to control charging of the capacitor bank by closing and opening the switch based on an amount of radiating of the radiating load.
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