公开(公告)号：US06995482B2

公开(公告)日：2006-02-07

申请号：US10828090

申请日：2004-04-20

Applicant: Pallab Midya ,  Cesar Pascual ,  Lawrence Edwin Connell

Inventor： Pallab Midya ,  Cesar Pascual ,  Lawrence Edwin Connell

IPC: H02B1/24

CPC classification number: H02M1/32 ,  H02M7/538 ,  H02M7/5387 ,  Y10T307/74 ,  Y10T307/76 ,  Y10T307/911 ,  Y10T307/918

Abstract: A method for providing a current path during switching transitions of a switching circuit while limiting the short circuit current. In one embodiment, a switching circuit includes a passive break-before-make element in series with two switches. An alternate embodiment includes a make-before-break element in parallel with the switches. The passive break-before-make element, or make-before-break element, provides a high impedance in a short term and a low impedance in a long term. The switching circuit may be coupled to a load through a low pass filter. In one embodiment, the switching circuit is used in a switching audio amplifier circuit, where correction of nonlinearities incorporates analog feedback to modify the duty ratio of a digitally generated switching signal in the analog domain.

Abstract translation: 一种用于在切换电路切换转换期间提供电流路径同时限制短路电流的方法。 在一个实施例中，开关电路包括与两个开关串联的被动断开元件。 替代实施例包括与开关并联的断开元件。 被动断开元件或断开元件在短期内提供高阻抗，并在长期内提供低阻抗。 开关电路可以通过低通滤波器耦合到负载。 在一个实施例中，切换电路用于开关音频放大器电路中，其中非线性校正包括模拟反馈以修改模拟域中的数字产生的开关信号的占空比。

公开(公告)号：US5710504A

公开(公告)日：1998-01-20

申请号：US650490

申请日：1996-05-20

Applicant: Cesar Pascual ,  Philip T. Krein

Inventor： Cesar Pascual ,  Philip T. Krein

IPC: H02J7/00 ,  H02J7/02 ,  H01M10/44 ,  H01M10/46

CPC classification number: H02J7/0018 ,  Y02T10/7055 ,  Y10T307/685

Abstract: A switched capacitor system for automatic battery equalization can be used with series coupled batteries as well as primary and backup batteries which are alternately couplable to a load. The system includes a plurality of capacitors and a plurality of switching elements. Each of the capacitors is switched back and forth between a predetermined pair of batteries for the purpose of transferring charge therebetween and equalizing the output voltages of each of the batteries in the pair. The capacitors and switching elements can be configured in a modular fashion. Multiple modules can be used, for example, in combination with multiple batteries which are series coupled to one another. The system could be used in electric vehicles and in battery back-up systems of all types.

Abstract translation: 用于自动电池均衡的开关电容器系统可用于串联耦合电池以及可替代地耦合到负载的主电池和备用电池。 该系统包括多个电容器和多个开关元件。 每个电容器在预定的一对电池之间来回切换，以便在其间传送电荷并使两个电池中的每个电池的输出电压相等。 电容器和开关元件可以以模块化方式配置。 可以使用多个模块，例如与彼此串联耦合的多个电池组合使用。 该系统可用于电动车辆和各种电池备用系统。

公开(公告)号：US06473457B1

公开(公告)日：2002-10-29

申请号：US09307453

申请日：1999-05-07

Applicant: Cesar Pascual ,  William J. Roeckner

Inventor： Cesar Pascual ,  William J. Roeckner

IPC: H03K908

CPC classification number: G11B20/10527 ,  H03M5/08

Abstract: A method and apparatus to produce a pulse width modulated (PWM) signal from pulse code modulated (PCM) data. In one embodiment, a crossing point of an analog signal with the ramp portion of a sawtooth waveform is approximated by first extrapolating, or projecting, a line between two adjacent sample points across other sample points to produce an estimate of the crossing point. A magnitude difference between a crossing point of the extrapolated line and a sample point magnitude on each side of the crossing point is determined. The magnitude difference, multiplied by an empirically determined constant, is added to the estimate. A PWM signal is then produced using the estimate for the crossing point.

Abstract translation: 一种从脉冲编码调制（PCM）数据产生脉宽调制（PWM）信号的方法和装置。 在一个实施例中，模拟信号与锯齿形波形的斜坡部分的交叉点通过首先外推或投影跨越其它采样点的两个相邻采样点之间的线来近似来产生交叉点的估计。 确定外插线的交叉点与交叉点两侧的采样点幅度之间的幅度差。 将幅度差乘以经验确定的常数加到估计值中。 然后使用对于交叉点的估计来产生PWM信号。