| 发明名称 | Indicator drive circuit | ||
| 摘要 | An indicator drive circuit includes a current mirror circuit including a first transistor located at a control side and a second transistor located at a controlled side, a current through the current mirror circuit being switched by an external control signal, a current source adapted to feed a control current to the first transistor of the current mirror circuit, and a switching element adapted to be driven by a current through the second transistor of the current mirror circuit and to switch on or off an indicator light source. The current source includes two transistors cascode-connected. | ||
| 申请公布号 | US8773040(B2) | 申请公布日期 | 2014.07.08 |
| 申请号 | US201113334597 | 申请日期 | 2011.12.22 |
| 申请人 | Kabushiki Kaisha Tokai Rika Denki Seisakusho | 发明人 | Kamiya Yusuke;Uruno Satoki;Matsubara Junichi |
| 分类号 | H05B37/02;H05B33/08 | 主分类号 | H05B37/02 |
| 代理机构 | Roberts Mlotkowski Safran & Cole P.C. | 代理人 | Roberts Mlotkowski Safran & Cole P.C. |
| 主权项 | 1. An indicator drive circuit, comprising: a current mirror circuit comprising a first transistor located at a control side and a second transistor located at a controlled side, a current through the current mirror circuit being switched by an external control signal; a current source adapted to feed a control current to the first transistor of the current mirror circuit; and a switching element adapted to be driven by a current through the second transistor of the current mirror circuit and to switch on or off an indicator light source; an inverter that inverts the external control signal, wherein the current source comprises two cascode-connected transistors, and one of the two transistors is controlled by the control signal inverted by the inverter. | ||
| 地址 | Aichi JP | ||