发明名称 |
Control system with capacitive detector |
摘要 |
A capacitive sensor system for controlling operation of a device in response to a rate of change in capacitance due to motion of a proximate object includes at least two sense electrodes disposed on a surface and a phase locked loop, including a voltage controlled oscillator and a phase/frequency comparator, connected between the sense electrodes and an RC network for providing an operating frequency to the sense electrodes. A circuit loop, including a reference oscillator, provides a fixed frequency reference for the phase locked loop to follow and a phase delay circuit connected between said phase/frequency comparator and said voltage controlled oscillator causes the voltage controlled oscillation to run ahead of the reference oscillator. A trigger circuit provides a control output in response to a change in phase shift between said fixed frequency and said operating frequency.
|
申请公布号 |
US2004085206(A1) |
申请公布日期 |
2004.05.06 |
申请号 |
US20030728407 |
申请日期 |
2003.12.05 |
申请人 |
WADLOW DAVID;SCHOLTEN FRANK;GIFFONE RALPH;GERENRAICH KENNETH |
发明人 |
WADLOW DAVID;SCHOLTEN FRANK;GIFFONE RALPH;GERENRAICH KENNETH |
分类号 |
G01N27/22;G01D5/24;G08B13/26;H03K17/955;(IPC1-7):G08B13/26 |
主分类号 |
G01N27/22 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|