发明申请
US20090179583A1 DIGITALLY SYNCHRONIZED INTEGRATOR FOR NOISE REJECTION IN SYSTEM USING PWM DIMMING SIGNALS TO CONTROL BRIGHTNESS OF COLD CATHODE FLUORESCENT LAMP FOR BACKLIGHTING LIQUID CRYSTAL DISPLAY
有权
数字同步整合器，用于使用PWM调光信号控制系统中的噪声抑制，以控制冷阴极荧光灯的亮度，用于背光液晶显示
- 专利标题： DIGITALLY SYNCHRONIZED INTEGRATOR FOR NOISE REJECTION IN SYSTEM USING PWM DIMMING SIGNALS TO CONTROL BRIGHTNESS OF COLD CATHODE FLUORESCENT LAMP FOR BACKLIGHTING LIQUID CRYSTAL DISPLAY
- 专利标题（中）： 数字同步整合器，用于使用PWM调光信号控制系统中的噪声抑制，以控制冷阴极荧光灯的亮度，用于背光液晶显示
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申请号： US12409238申请日： 2009-03-23
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公开(公告)号： US20090179583A1公开(公告)日： 2009-07-16
- 发明人: Dong ZHENG , Robert L. LYLE, JR. , Barry HARVEY , Brian B. NORTH
- 申请人： Dong ZHENG , Robert L. LYLE, JR. , Barry HARVEY , Brian B. NORTH
- 申请人地址： US CA Milpitas
- 专利权人： INTERSIL AMERICAS INC.
- 当前专利权人： INTERSIL AMERICAS INC.
- 当前专利权人地址： US CA Milpitas
- 主分类号： H05B41/288
- IPC分类号： H05B41/288 ; H02M7/5395
摘要：
An apparatus and method for controlling the operation of a utility device, such as a cold cathode fluorescent lamp that is powered in accordance with a pulse width modulation (PWM) signal, includes an analog sensor which monitors the utility device to derive an output signal representative of the PWM signal. An integrating analog-to-digital converter (ADC), which is coupled to the sensor and has its operation synchronized with an integral multiple of the period of the PWM signal, produces an output representative of an average of the output of the utility device.
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