公开(公告)号：US06781356B1

公开(公告)日：2004-08-24

申请号：US10249217

申请日：2003-03-24

Applicant: Ta-yung Yang ,  Chem-Lin Chen ,  Jenn-yu G. Lin

Inventor： Ta-yung Yang ,  Chem-Lin Chen ,  Jenn-yu G. Lin

IPC: G05F140

CPC classification number: H02M1/40 ,  H02M1/44 ,  H02M3/33507 ,  H02M2001/0032 ,  H02M2001/0041 ,  Y02B70/16

Abstract: A modulator of a PWM controller is provided for saving power and reducing acoustic noise in the light load and no load conditions. The maximum on-time is kept as a constant and a bias current of the oscillator in the PWM controller is moderated to achieve the off-time modulation. The bias current is a function of the supply voltage and the feedback voltage, which is derived from a voltage feedback loop. A threshold voltage defines the level of the light load. A limit voltage defines the low level of the supply voltage. A bias current synthesizer generates the bias current. Reducing the bias current increases the off-time of the switching period. Once the feedback voltage is decreased lower than the threshold voltage, the bias current is reduced linearly and the off-time of the switching period is increased gradually. When the supply voltage is lower than the limit voltage, the bias current increases and determines a maximum off-time of the switching period. Keeping the maximum on-time as a constant and increasing the switching period by only increasing the off-time prevents magnetic components, such as inductors and transformers, from being saturated. Furthermore, a control circuit disables the oscillator as the PWM frequency may fall into the audio band, therefore the acoustic noise can be greatly reduced in the light load and no load conditions.

Abstract translation: 提供PWM控制器的调制器，用于在轻负载和无负载条件下节省电力并降低噪声。 将最大导通时间保持为恒定，并且调节PWM控制器中的振荡器的偏置电流以实现关断时间调制。 偏置电流是由电压反馈回路导出的电源电压和反馈电压的函数。 阈值电压定义轻负载的电平。 极限电压定义电源电压的低电平。 偏置电流合成器产生偏置电流。 降低偏置电流会增加开关周期的关断时间。 一旦反馈电压降低到低于阈值电压，则偏置电流线性减小，并且切换周期的关闭时间逐渐增加。 当电源电压低于极限电压时，偏置电流增加并确定开关周期的最大关断时间。 保持最大导通时间为常数，并通过增加关断时间来增加开关周期，防止磁性元件（如电感器和变压器）饱和。 此外，由于PWM频率可能落入音频频带，所以控制电路使振荡器不起作用，因此在轻负载和无负载条件下可以大大降低声学噪声。

公开(公告)号：US07145523B2

公开(公告)日：2006-12-05

申请号：US10656169

申请日：2003-09-08

Applicant: Horng-Bin Hsu ,  Yi-Mei Li ,  Jih-Fon Huang ,  Chem-Lin Chen

Inventor： Horng-Bin Hsu ,  Yi-Mei Li ,  Jih-Fon Huang ,  Chem-Lin Chen

IPC: G09G3/28

CPC classification number: G09G3/2942 ,  G09G3/2807 ,  G09G3/2927 ,  G09G3/296

Abstract: A driving apparatus for driving a plasma display panel and a method of driving the same are disclosed. The plasma display panel includes multiple display cells, with each of the display cells comprising a sustain electrode, a scan electrode, and a data electrode. Every set of the electrodes has a corresponding driving circuit to provide a required driving waveform for driving the display cell to luminesce. The driving method includes the following steps: first, a first erase pulse, a priming pulse, and a second erase pulse are applied in sequence during a reset period. Then, data pulses corresponding to the display cells are applied during an address period. Lastly, multiple sustain pulses and multiple high frequency driving pulses are applied simultaneously during a sustain period.

Abstract translation: 公开了一种驱动等离子体显示面板的驱动装置及其驱动方法。 等离子体显示面板包括多个显示单元，每个显示单元包括维持电极，扫描电极和数据电极。 每组电极具有相应的驱动电路，以提供用于驱动显示单元发光的所需驱动波形。 驱动方法包括以下步骤：首先，在复位期间依次施加第一擦除脉冲，引脚脉冲和第二擦除脉冲。 然后，在寻址周期期间应用对应于显示单元的数据脉冲。 最后，在维持期间同时施加多个维持脉冲和多个高频驱动脉冲。

公开(公告)号：US06836415B1

公开(公告)日：2004-12-28

申请号：US10465161

申请日：2003-06-18

Applicant: Ta-yung Yang ,  Chem-Lin Chen ,  Jenn-yu G. Lin ,  Song-Yi Lin

Inventor： Ta-yung Yang ,  Chem-Lin Chen ,  Jenn-yu G. Lin ,  Song-Yi Lin

IPC: H02M3335

CPC classification number: H02M3/33507 ,  H01F2038/026 ,  H02M2001/0006

Abstract: The present invention provides a primary-side regulated PWM controller with improved load regulation. In every PWM cycle, a built-in feedback voltage samples and holds a flyback voltage from the auxiliary winding of the transformer via a sampling switch and generates a feedback voltage accordingly. A bias current sink pulls a bias current that is proportional to the feedback voltage. Via a detection resistor, the bias current will produce a voltage drop to compensate the voltage drop of an output rectifying diode as the output load changes. According to the present invention, the bias current can enable the PWM controller to regulate the output voltage very precisely without using a secondary feedback circuit.

Abstract translation: 本发明提供了具有改进的负载调节的初级侧调节PWM控制器。 在每个PWM周期中，内置的反馈电压通过采样开关采样并保持来自变压器的辅助绕组的反激电压，并产生相应的反馈电压。 偏置电流吸收器提供与反馈电压成比例的偏置电流。 通过检测电阻，当输出负载变化时，偏置电流将产生电压降，以补偿输出整流二极管的电压降。 根据本发明，偏置电流可使PWM控制器非常精确地调节输出电压，而不使用次级反馈电路。