公开(公告)号：US07352162B1

公开(公告)日：2008-04-01

申请号：US11621519

申请日：2007-01-09

申请人： Yung Ching Chang ,  Yen Kuo Lo ,  Wen Chia Pi

发明人： Yung Ching Chang ,  Yen Kuo Lo ,  Wen Chia Pi

IPC分类号： G05F1/40 ,  H02M7/10

CPC分类号： H02M3/156 ,  H02M1/36 ,  Y10S323/901

摘要： A PWM (pulse width modulation) boost system includes a boost circuit, a voltage dividing circuit, a comparator, a PWM circuit, a pre-oscillator, and a current limit circuit. A start-up method of the PWM boost system includes (1) providing an error voltage; (2) generating a PWM signal according to the error voltage; (3) controlling a switch in a boost circuit with the PWM signal, so as to control an inductor current flowing through a boost inductor in the boost circuit; (4) charging a capacitor in the boost circuit with the inductor current, wherein charges stored in the capacitor define a DC output voltage; and (5) providing a feedback voltage according to the DC output voltage to adjust the error voltage.

摘要翻译： PWM（脉宽调制）升压系统包括升压电路，分压电路，比较器，PWM电路，预振荡器和限流电路。 PWM升压系统的启动方法包括：（1）提供误差电压; （2）根据误差电压产生PWM信号; （3）利用PWM信号控制升压电路中的开关，以控制流过升压电路中的升压电感器的电感电流; （4）利用电感器电流对升压电路中的电容器充电，其中存储在电容器中的电荷限定了DC输出电压; 和（5）根据直流输出电压提供反馈电压以调整误差电压。

公开(公告)号：US20080225034A1

公开(公告)日：2008-09-18

申请号：US11730156

申请日：2007-03-29

申请人： Wen Chia Pi ,  Yung Ching Chang ,  Yen Kuo Lo ,  Ko Ching Su

发明人： Wen Chia Pi ,  Yung Ching Chang ,  Yen Kuo Lo ,  Ko Ching Su

IPC分类号： G06F3/038

CPC分类号： G09G3/3696 ,  G09G3/3648 ,  G09G3/3677 ,  G09G2310/0245 ,  G09G2330/02 ,  G09G2330/027

摘要： The image sticking erasing circuit includes a detection circuit and a switching circuit connected to the detection circuit. The detection circuit is for use in detecting a first voltage signal, which closely follows the variation of the voltage source, and a reference voltage, which loosely follows the variation of the voltage source. When the detection circuit determines that the first voltage signal is lower than a first threshold value, the switching circuit switches the gate of a driving transistor to a second voltage signal, which loosely follows the voltage source. When the detection circuit determines that the reference voltage signal is lower than a second threshold value, the switching circuit switches the gate of a driving transistor to a low voltage state.

摘要翻译： 图像粘贴消除电路包括检测电路和连接到检测电路的开关电路。 检测电路用于检测密切跟随电压源的变化的第一电压信号，以及宽松地跟随电压源的变化的参考电压。 当检测电路确定第一电压信号低于第一阈值时，开关电路将驱动晶体管的栅极切换到宽松地跟随电压源的第二电压信号。 当检测电路确定参考电压信号低于第二阈值时，开关电路将驱动晶体管的栅极切换到低电压状态。

公开(公告)号：US20080067985A1

公开(公告)日：2008-03-20

申请号：US11621519

申请日：2007-01-09

申请人： Yung Ching Chang ,  Yen Kuo Lo ,  Wen Chia Pi

发明人： Yung Ching Chang ,  Yen Kuo Lo ,  Wen Chia Pi

IPC分类号： G05F1/00

CPC分类号： H02M3/156 ,  H02M1/36 ,  Y10S323/901

摘要： A PWM (pulse width modulation) boost system includes a boost circuit, a voltage dividing circuit, a comparator, a PWM circuit, a pre-oscillator, and a current limit circuit. A start-up method of the PWM boost system includes (1) providing an error voltage; (2) generating a PWM signal according to the error voltage; (3) controlling a switch in a boost circuit with the PWM signal, so as to control an inductor current flowing through a boost inductor in the boost circuit; (4) charging a capacitor in the boost circuit with the inductor current, wherein charges stored in the capacitor define a DC output voltage; and (5) providing a feedback voltage according to the DC output voltage to adjust the error voltage.

摘要翻译： PWM（脉宽调制）升压系统包括升压电路，分压电路，比较器，PWM电路，预振荡器和限流电路。 PWM升压系统的启动方法包括：（1）提供误差电压; （2）根据误差电压产生PWM信号; （3）利用PWM信号控制升压电路中的开关，以控制流过升压电路中的升压电感器的电感电流; （4）利用电感器电流对升压电路中的电容器充电，其中存储在电容器中的电荷限定了DC输出电压; 和（5）根据直流输出电压提供反馈电压以调整误差电压。

公开(公告)号：US20130046154A1

公开(公告)日：2013-02-21

申请号：US13306866

申请日：2011-11-29

申请人： Yue Der Lin ,  Shih Fan Wang ,  Hu Ying Ho ,  Ching Che Tsai ,  Kang Ping Lin ,  Hen Hong Chang ,  Yung Ching Chang

发明人： Yue Der Lin ,  Shih Fan Wang ,  Hu Ying Ho ,  Ching Che Tsai ,  Kang Ping Lin ,  Hen Hong Chang ,  Yung Ching Chang

IPC分类号： A61B5/1455

CPC分类号： A61B5/14551 ,  A61B5/02007

摘要： The present invention discloses a PPG imaging device and a PPG measuring method. The PPG imaging device comprises a light emitting unit, a collimator unit, a beam splitter unit, an image sensing unit, and an image analysis unit. The light emitting unit provides an incident light signal. The collimator unit receives the incident light signal and transforms the incident light signal into a parallel light signal. The beam splitter unit receives the parallel light signal and reflects it to a tested region. The image sensing unit receives a reflected light signal reflected from the tested region and converts it into image signals. The image analysis unit connects with the image sensing unit and analyzes the image signals to obtain PPG signals of the tested region. The PPG imaging device may be arranged in an anti-light pollution unit, whereby to prevent from optical interference and obtain higher measurement precision.

摘要翻译： 本发明公开了一种PPG成像装置和PPG测定方法。 PPG成像装置包括发光单元，准直器单元，分束器单元，图像感测单元和图像分析单元。 发光单元提供入射光信号。 准直器单元接收入射光信号并将入射光信号转换成并行光信号。 分束器单元接收平行光信号并将其反射到测试区域。 图像感测单元接收从测试区域反射的反射光信号并将其转换为图像信号。 图像分析单元与图像感测单元连接并分析图像信号以获得测试区域的PPG信号。 PPG成像装置可以布置在防光污染单元中，从而防止光学干扰并获得更高的测量精度。

公开(公告)号：US07812668B2

公开(公告)日：2010-10-12

申请号：US12235925

申请日：2008-09-23

申请人： Yung Ching Chang

发明人： Yung Ching Chang

IPC分类号： H03F3/45

CPC分类号： H03F3/45475 ,  H03F3/45968 ,  H03F2203/45136 ,  H03F2203/45138 ,  H03F2203/45212 ,  H03F2203/45648

摘要： A multi-input operational amplifier comprises two transconductors, two current mirrors, and a current source. Each transconductor generates a current according to a corresponding voltage difference. When the voltage difference is less than or equal to zero, the current is a constant. When the voltage difference exceeds zero, the current is proportional to the voltage difference.

摘要翻译： 多输入运算放大器包括两个跨导体，两个电流镜和电流源。 每个跨导体根据相应的电压差产生电流。 当电压差小于或等于零时，电流为常数。 当电压差超过零时，电流与电压差成正比。