公开(公告)号：US07167055B2

公开(公告)日：2007-01-23

申请号：US11331192

申请日：2006-01-13

申请人： Shiah Siew Wong ,  Yasuo Higuchi

发明人： Shiah Siew Wong ,  Yasuo Higuchi

IPC分类号： H03F1/52

CPC分类号： H03F1/52 ,  H03F3/181 ,  H03F3/72

摘要： A voltage level detector (8) which activates itself by monitoring the voltage level (VSTB) at a standby pin (5) during power-up of an audio power amplifier (10), and can detect fault conditions of an output block (2), such as a short to ground at an output terminal (3), in contrast to conventional protection circuits that can operate only after power-up.

摘要翻译： 一种电压电平检测器（8），其通过在音频功率放大器（10）上电期间监视备用引脚（5）处的电压电平（V SUB STB）而自身启动，并且可以检测故障 与仅在上电后才能操作的常规保护电路相比，输出端子（2）的输出块（2）的条件，例如输出端子（3）处的接地短路。

公开(公告)号：US07030700B2

公开(公告)日：2006-04-18

申请号：US10824659

申请日：2004-04-15

申请人： Shiah Siew Wong ,  Yasuo Higuchi

发明人： Shiah Siew Wong ,  Yasuo Higuchi

IPC分类号： H02H7/20 ,  H03F3/04

CPC分类号： H03F1/52 ,  H03F3/181 ,  H03F3/72

摘要： A voltage level detector (8) activates itself through monitoring the voltage level (VSTB) at a standby pin (5) during power-up of an audio power amplifier (10), and can detect fault conditions of an output block (2). Upon detection of the (VSTB) reaching a first threshold level (Vth1) and a short to ground at the output terminal (3), the second short-to-ground detection block (81) activates a the second cutoff signal generating block (83). The recovery block (82) monitors the voltage level (VSTB) at the standby pin (5) during power-up. Upon detection of the voltage level (VSTB) reaching a second threshold level (Vth2>Vth1), the recovery block (82) deactivates the cutoff signal generating block (83). The cutoff signal generating block (83) sends a cutoff signal (Sc) to a protection switch block (71) as a request for turn-off of protection switches (7A) on activation, and on the other hand, terminal the sending of the cutoff signal (Sc) on deactivation.

摘要翻译： 电压电平检测器（8）通过在音频功率放大器（10）上电期间监视备用引脚（5）处的电压电平（VSTB）而自身激活，并且可以检测输出块（2）的故障状况。 当检测到（VSTB）在输出端（3）处达到第一阈值电平（Vth 1）和接地短路时，第二短路到检测块（81）激活第二截止信号产生块（ 83）。 恢复块（82）在上电期间监视备用引脚（5）处的电压电平（VSTB）。 当检测到电压电平（VSTB）达到第二阈值电平（Vth 2> Vth 1）时，恢复块（82）使截止信号产生块（83）无效。 截止信号生成块（83）在保护开关（7A）的激活请求时向切换保护开关（71）发送切断信号（Sc），另一方面，终端发送 停用信号（Sc）。

公开(公告)号：US07439801B2

公开(公告)日：2008-10-21

申请号：US11536221

申请日：2006-09-28

申请人： Yasuo Higuchi ,  Shiah Siew Wong

发明人： Yasuo Higuchi ,  Shiah Siew Wong

IPC分类号： H03F3/38

CPC分类号： H03F3/217

摘要： An amplifier circuit that uses multiple power supplies includes a class D amplifier circuit, input bias generator and feedback network. By creating a voltage using the input bias generator at the non inverting terminal of the integrator, the inverting terminal of the integrator will follow the same voltage as the non inverting terminal. The offset voltage between the input signal DC bias and the input DC bias of the integrator will create an offset current flowing through the feedback resistors, thus resulting in the desired output DC bias.

摘要翻译： 使用多个电源的放大器电路包括D类放大器电路，输入偏置发生器和反馈网络。 通过使用积分器的非反相端子处的输入偏置发生器产生电压，积分器的反相端子将遵循与非反相端子相同的电压。 输入信号DC偏置和积分器的输入直流偏置之间的偏移电压将产生流过反馈电阻的偏移电流，从而产生所需的输出直流偏置。

公开(公告)号：US07495509B2

公开(公告)日：2009-02-24

申请号：US11567431

申请日：2006-12-06

申请人： Shiah Siew Wong ,  Jing Sun

发明人： Shiah Siew Wong ,  Jing Sun

IPC分类号： H03F3/38 ,  H03F3/217 ,  H03F1/52

CPC分类号： H03F3/217

摘要： A smart protection circuit to prevent possible circuit malfunction or damage due to sudden power source voltage fluctuation is introduced. In case of quick and large voltage fluctuation in power supply, a control signal is activated to stop power transistor switching. When power supply is stable at a lower or higher operating voltage, the switching circuit is able to return to normal operation.

摘要翻译： 引入智能保护电路，以防止可能的电路故障或由于突然的电源电压波动而导致的损坏。 在电源电压波动较大的情况下，控制信号被激活以停止功率晶体管的切换。 当电源在较低或较高的工作电压下稳定时，开关电路能够恢复正常工作。

公开(公告)号：US07692488B2

公开(公告)日：2010-04-06

申请号：US12039097

申请日：2008-02-28

申请人： Shiah Siew Wong ,  Wee Sien Hong ,  Chee Kuan Leong ,  Narciso Repollo Semira

发明人： Shiah Siew Wong ,  Wee Sien Hong ,  Chee Kuan Leong ,  Narciso Repollo Semira

IPC分类号： H03F3/217

CPC分类号： H03F1/52 ,  H03F3/217 ,  H03F3/68 ,  H03F2200/03 ,  H03F2200/351 ,  H03F2200/375

摘要： A class D amplifier with output DC offset protection is disclosed. The DC offset protection receives a PWM input signals from the outputs and investigates the PWM output signals whether there is a large DC voltage difference is being reflected on the speaker load. If so, shutdown signal SD will be sent by the DC offset protection to the PWM control logic and gate driver, thus, shutting down the output of the class D system and preventing disastrous condition from being develop across the speaker.

摘要翻译： 公开了具有输出直流偏移保护的D类放大器。 DC偏移保护接收来自输出的PWM输入信号，并调查PWM输出信号是否在扬声器负载上反映出大的直流电压差异。 如果是这样的话，关断信号SD将通过DC偏移保护发送到PWM控制逻辑和门驱动器，从而关闭D类系统的输出，并防止在扬声器上发展灾难性的状况。

公开(公告)号：US07696808B2

公开(公告)日：2010-04-13

申请号：US11949903

申请日：2007-12-04

申请人： Shiah Siew Wong ,  Wee Sien Hong ,  Tien Yew Kang ,  Jing Sun

发明人： Shiah Siew Wong ,  Wee Sien Hong ,  Tien Yew Kang ,  Jing Sun

IPC分类号： H03K17/16

CPC分类号： H03F3/2171 ,  H03K17/166

摘要： A slew rate control circuit in output driver of switching circuit to prevent power ground undershoot is introduced. The gate capacitance of lower power transistor is first fast discharged to ensure the operation of the output signal. The gate capacitance of lower power transistor is then slowly discharged to limit OUT SLEW RATE. The gate capacitance of lower power transistor is further slowly discharged when the power ground level is below common ground. With above controlling, the gate voltage slew rate of lower power transistor is reduced when the lower power transistor is almost fully turned OFF. Therefore, undershoot at the power ground is avoided. Similar slew rate control circuit can also be derived in output driver of switching circuit to prevent PVCC overshoot.

摘要翻译： 介绍了一种用于防止电源地下冲的开关电路的输出驱动器中的转换速率控制电路。 低功率晶体管的栅极电容首先快速放电，以确保输出信号的工作。 然后，较低功率晶体管的栅极电容缓慢放电以限制OUT SLEW RATE。 当功率接地电平低于公共地面时，较低功率晶体管的栅极电容进一步缓慢放电。 通过上述控制，当下功率晶体管几乎完全关断时，下功率晶体管的栅极电压转换速率降低。 因此，避免了电源地的下冲。 类似的转换速率控制电路也可以在开关电路的输出驱动器中导出，以防止PVCC过冲。

公开(公告)号：US07446603B2

公开(公告)日：2008-11-04

申请号：US11465145

申请日：2006-08-17

申请人： Shiah Siew Wong ,  Wee Sien Hong ,  Tien Yew Kang ,  Chew Yuan Woong

发明人： Shiah Siew Wong ,  Wee Sien Hong ,  Tien Yew Kang ,  Chew Yuan Woong

IPC分类号： H03F3/38

CPC分类号： H03F3/217 ,  H03F1/305 ,  H03F1/32 ,  H03F1/34 ,  H03F3/45475 ,  H03F2200/03 ,  H03F2200/129 ,  H03F2200/351 ,  H03F2200/459 ,  H03F2203/45134

摘要： A differential input Class D audio power amplifier incorporating a differential error amplifier is introduced. In response of differential input signal, this differential error amplifier generates two error signals, which subsequently generates final output signal. This architecture makes it the effect of feedback signal error correction doubled, which helps in achieving good THD. In addition, input port of this architecture is also compatible with single-ended signal. A pop noise suppression technique for this differential input Class D audio power amplifier is also introduced.

摘要翻译： 引入了包含差分误差放大器的差分输入D类音频功率放大器。 响应于差分输入信号，该差分误差放大器产生两个误差信号，随后产生最终的输出信号。 这种架构使得反馈信号误差校正的效果加倍，这有助于实现良好的THD。 此外，此架构的输入端口也与单端信号兼容。 此类差分输入D类音频功率放大器也采用流行噪声抑制技术。

公开(公告)号：US07321258B2

公开(公告)日：2008-01-22

申请号：US11193666

申请日：2005-07-29

申请人： Shiah Siew Wong ,  Guolei Yu

发明人： Shiah Siew Wong ,  Guolei Yu

IPC分类号： G05F1/40

CPC分类号： H02M3/1588 ,  H02M2001/0032 ,  Y02B70/1466 ,  Y02B70/16

摘要： A method of controlling the charge of the bootstrap capacitor during light load or no load conditions for a non-synchronous type of DC-DC converter consists of bootstrap capacitor voltage detector, light load detector and secondary switch controller. By turning on the secondary switch during the off-time of the power transistor when the bootstrap voltage is lower than the required value under light load condition, the bootstrap capacitor voltage will be able to charge back to the required value, yet minimizing the minimum current requirement for the DC-DC converter.

摘要翻译： 在非负载条件下，对于非同步型DC-DC转换器，轻负载或无负载条件下控制自举电容的充电方法由自举电容电压检测器，轻载检测器和二次开关控制器组成。 通过在轻载条件下自举电压低于所需值时，在功率晶体管截止时间期间接通二次开关，自举电容电压将能够充电至所需值，但最小化最小电流 对DC-DC转换器的要求。