发明授权
- 专利标题: Pulse width modulated driver
- 专利标题(中): 脉宽调制驱动
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申请号: US09691401申请日: 2000-10-18
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公开(公告)号: US06377131B1公开(公告)日: 2002-04-23
- 发明人: Peter Langer
- 申请人: Peter Langer
- 主分类号: H03K708
- IPC分类号: H03K708
摘要:
A pulse width modulated driver 20 is provided for driving a load 17, such as a halogen bulb, at a reduced voltage level. The driver 20 includes a switch 28 selectively opening and closing to apply a pulse width modulated signal VPWM to a high voltage end of the load 17. The switch 28 operates responsive to a switch control signal VS. The driver 20 further includes a duty cycle control circuit 26 generating the switch control signal VS when an input operational voltage Vo is above a threshold voltage level. Finally, the driver includes an energy storage circuit 24 for storing electrical energy when the switch 28 is open to maintain the input operational voltage Vo above the threshold voltage level. The driver 20 is connected on a high side of the load 17 and does not require a separate line connected to system ground.