发明名称 |
Constant-voltage circuit device |
摘要 |
A constant-voltage circuit converts a voltage input to an input terminal and outputs a predetermined constant voltage from an output terminal. The constant-voltage circuit includes an output transistor to output an electrical current to the output terminal in response to a control signal, a reference voltage circuit to generate a predetermined reference voltage, a control circuit to adjust a voltage proportional to the output voltage output from the output terminal to the reference voltage output from the reference voltage circuit by controlling the output transistor and a soft start circuit including a capacitor for soft start that is charged at start-up and a current control unit to control an electrical current supplied to the reference voltage circuit. The current control unit adjusts the reference voltage to a voltage determined by the capacitor for soft start at the start-up until the reference voltage reaches a desired voltage. |
申请公布号 |
US8242760(B2) |
申请公布日期 |
2012.08.14 |
申请号 |
US20090546945 |
申请日期 |
2009.08.25 |
申请人 |
TAKAGI YOSHIKI;WATANABE KENICHI;RICOH COMPANY, LTD. |
发明人 |
TAKAGI YOSHIKI;WATANABE KENICHI |
分类号 |
G05F1/569 |
主分类号 |
G05F1/569 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|