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。