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公开(公告)号：US07205776B2
公开(公告)日：2007-04-17
申请号：US11221108
申请日：2005-09-07
CPC分类号： H03K17/962 , G01D5/24 , G01D5/2405 , G01R27/2605
摘要： Whether a human body is touching or not is detected highly accurately at high speed. Switch SW1 is turned on to charge condenser Ca by power supply Vcc. The switch SW1 is turned off to transfer the electric charge charged in the condenser Ca to condensers Cs and Cx. The switches SW2 and SW3 are repeatedly turned on and off for a predetermined short time, and thus the electric charge charged in the condenser Ca is slowly discharged through resistor R. The unknown charging voltage Vx of the condenser Cx is compared with the reference voltage Vref by comparator Comp, and the unknown capacitance of the condenser Cx is computed based on the number of times to count turning on and off until it is smaller than the reference voltage Vref. When the computed unknown capacitance of the condenser Cx is the value near the capacitance of a human body, it is determined that a human body is touching. The invention can be applied to a touch sensor.
摘要翻译： 是否高速准确地检测到人体是否触摸。 开关SW 1导通，通过电源Vcc对电容器Ca充电。 开关SW 1断开，将在电容器Ca中充入的电荷转移到电容器Cs和Cx。 开关SW 2和SW 3反复接通和断开预定的短时间，因此充电在电容器Ca中的电荷通过电阻器R缓慢放电。电容器Cx的未知充电电压Vx与参考 通过比较器Comp的电压Vref，并且基于计数打开和关闭的次数直到其小于参考电压Vref来计算电容器Cx的未知电容。 当计算出的电容器Cx的未知电容值接近人体的电容值时，确定人体正在接触。 本发明可应用于触摸传感器。
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公开(公告)号：US20060055416A1
公开(公告)日：2006-03-16
申请号：US11221108
申请日：2005-09-07
IPC分类号： G01R27/26
CPC分类号： H03K17/962 , G01D5/24 , G01D5/2405 , G01R27/2605
摘要： Whether a human body is touching or not is detected highly accurately at high speed. Switch SW1 is turned on to charge condenser Ca by power supply Vcc. The switch SW1 is turned off to transfer the electric charge charged in the condenser Ca to condensers Cs and Cx. The switches SW2 and SW3 are repeatedly turned on and off for a predetermined short time, and thus the electric charge charged in the condenser Ca is slowly discharged through resistor R. The unknown charging voltage Vx of the condenser Cx is compared with the reference voltage Vref by comparator Comp, and the unknown capacitance of the condenser Cx is computed based on the number of times to count turning on and off until it is smaller than the reference voltage Vref. When the computed unknown capacitance of the condenser Cx is the value near the capacitance of a human body, it is determined that a human body is touching. The invention can be applied to a touch sensor.
摘要翻译： 是否高速准确地检测到人体是否触摸。 开关SW 1导通，通过电源Vcc对电容器Ca充电。 开关SW 1断开，将在电容器Ca中充入的电荷转移到电容器Cs和Cx。 开关SW 2和SW 3反复接通和断开预定的短时间，因此充电在电容器Ca中的电荷通过电阻器R缓慢放电。电容器Cx的未知充电电压Vx与参考 通过比较器Comp的电压Vref，并且基于计数打开和关闭的次数直到其小于参考电压Vref来计算电容器Cx的未知电容。 当计算出的电容器Cx的未知电容值接近人体的电容值时，确定人体正在接触。 本发明可应用于触摸传感器。
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