Invention Grant
- Patent Title: Constant voltage circuit capable of quickly responding to a sudden change of load current
- Patent Title (中): 恒压电路能够快速响应负载电流的突然变化
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Application No.: US12222537Application Date: 2008-08-11
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Publication No.: US07772817B2Publication Date: 2010-08-10
- Inventor: Yoshiki Takagi , Yusuke Minakuchi
- Applicant: Yoshiki Takagi , Yusuke Minakuchi
- Applicant Address: JP Tokyo
- Assignee: Ricoh Company, Ltd.
- Current Assignee: Ricoh Company, Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Dickstein Shapiro LLP
- Priority: JP2005-107677 20050404
- Main IPC: G05F1/565
- IPC: G05F1/565
Abstract:
A constant voltage circuit which is capable of quickly responding to a sudden change of an output voltage includes an output transistor, and first and second error amplifiers. The output transistor outputs a power with an output voltage and an output current to a load. The first error amplifier is configured to increase a response speed with respect to changes of the output voltage in accordance with an increase of the output current so as to control operations of the output transistor. The second error amplifier has a response speed faster than the first error amplifier with respect to changes of the output voltage, and is configured to decrease a gain thereof in response to a drain current of the output transistor.
Public/Granted literature
- US20090015222A1 Constant voltage circuit capable of quickly responding to a sudden change of load current Public/Granted day:2009-01-15
Information query
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