公开(公告)号：US20090129125A1

公开(公告)日：2009-05-21

申请号：US11942954

申请日：2007-11-20

申请人： Ta-yung Yang

发明人： Ta-yung Yang

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： A primary-side switching circuit generates switching signals for switching a transformer. A secondary-side switching circuit is coupled to an output of the power converter to generate pulse signals in response to the switching signals and an output voltage of the power converter. Pulse signals are generated to rectify and regulate the power converter. A synchronous switch includes a power-switch set and a control circuit. The control circuit receives the pulse signals via capacitors for turning on/off the power-switch set. The power-switch set is connected in between the transformer and the output of the power converter. Furthermore, a flyback switch is operated to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off state of the power-switch set. The on time of the flyback switch is programmable and correlated to the on time of the power-switch set.

摘要翻译： 初级侧开关电路产生用于切换变压器的开关信号。 次级侧开关电路耦合到功率转换器的输出端，以响应于开关信号和功率转换器的输出电压产生脉冲信号。 产生脉冲信号来整流和调节功率转换器。 同步开关包括电源开关组和控制电路。 控制电路通过电容器接收脉冲信号，用于打开/关闭电源开关组。 电源开关组件连接在变压器和电源转换器的输出端之间。 此外，操作回扫开关以使电力转换器的电感电流腾飞。 回扫开关响应于电源开关组的关闭状态而导通。 反激开关的导通时间是可编程的，并且与电源开关组的接通时间相关。

公开(公告)号：US07531996B2

公开(公告)日：2009-05-12

申请号：US11602357

申请日：2006-11-21

申请人： Ta-Yung Yang ,  Chih-Ho Lin

发明人： Ta-Yung Yang ,  Chih-Ho Lin

IPC分类号： G05F1/40

CPC分类号： G05F1/575

摘要： A low dropout (LDO) regulator operates in wide input range. The LDO includes an N-type pass transistor and a P-type pass transistor for supplying power to the output terminal. The P-type pass transistor is connected with N-type pass transistor in parallel. Two error amplifiers control the gate terminals of the N-type pass transistor and P-type pass transistor to generate a first output voltage and a second output voltage. Thus, the first output voltage is generated when the input voltage is higher than a threshold voltage, and the second output voltage is generated when the input voltage is lower than the threshold voltage.

摘要翻译： 低压差（LDO）稳压器在宽输入范围内工作。 LDO包括用于向输出端子供电的N型通过晶体管和P型通过晶体管。 P型传输晶体管与N型传输晶体管并联连接。 两个误差放大器控制N型通过晶体管和P型通过晶体管的栅极端子以产生第一输出电压和第二输出电压。 因此，当输入电压高于阈值电压时产生第一输出电压，并且当输入电压低于阈值电压时产生第二输出电压。

公开(公告)号：US07518416B2

公开(公告)日：2009-04-14

申请号：US11763138

申请日：2007-06-14

申请人： Ta-yung Yang ,  Chuh-Ching Li

发明人： Ta-yung Yang ,  Chuh-Ching Li

IPC分类号： H03B1/00 ,  H03K3/00

CPC分类号： H02M3/33507 ,  G01R19/0092 ,  H02M2001/0009

摘要： The present invention provides a method and apparatus for detecting a continuous current of a switching current. A current signal is produced in response to a switching current of the magnetic device. By sampling the waveform of the current signal in response to the enabling of a switching signal, a first current signal and a second current signal are generated. A continuous current signal is produced according to the first current signal and the second current signal. The continuous current signal is corrected to the continuous current of the switching current.

摘要翻译： 本发明提供一种用于检测开关电流的连续电流的方法和装置。 响应于磁性装置的开关电流产生电流信号。 通过响应于使能切换信号对当前信号的波形进行采样，产生第一电流信号和第二电流信号。 根据第一电流信号和第二电流信号产生连续电流信号。 连续电流信号被校正为开关电流的连续电流。

公开(公告)号：USRE40656E1

公开(公告)日：2009-03-10

申请号：US11411208

申请日：2006-04-24

申请人： Ta-yung Yang ,  Jenn-Yu G. Lin ,  Chern-Lin Chen

发明人： Ta-yung Yang ,  Jenn-Yu G. Lin ,  Chern-Lin Chen

IPC分类号： H02M3/335

CPC分类号： H02M3/33507 ,  H02M1/32 ,  H02M2001/0006 ,  H02M2001/0032 ,  H02M2001/0041 ,  Y02B70/16

摘要： The present invention provides a primary-side flyback power converter that supplies a constant voltage output and a constant current output. To generate a well-regulated output voltage under varying load conditions, a PWM controller is included in the power converter in order to generate a PWM signal controlling a switching transistor in response to a flyback voltage sampled from a first primary winding of the power supply transformer. Several improvements are included in this present invention to overcome the disadvantages of prior-art flyback power converters. Firstly, the flyback energy of the first primary winding is used as a DC power source for the PWM controller in order to reduce power consumption. A double sample amplifier samples the flyback voltage just before the transformer current drops to zero. Moreover, an offset current is pulled from a detection input of the double sample amplifier in order to generate a more accurate DC output voltage. The offset current is generated in response to the temperature in order to compensate for temperature-induced voltage fluctuations across the output rectifier. Ultimately, in order to maintain a constant output current, the PWM controller modulates the switching frequency in response to the output voltage.

摘要翻译： 本发明提供了提供恒定电压输出和恒定电流输出的初级侧反激式功率转换器。 为了在变化的负载条件下产生良好调节的输出电压，PWM控制器被包括在功率转换器中，以便响应于从电源变压器的第一初级绕组采样的回扫电压产生控制开关晶体管的PWM信号 。 在本发明中包括若干改进以克服现有技术的反激式功率转换器的缺点。 首先，为了降低功耗，首先将初级绕组的回扫能量用作PWM控制器的直流电源。 双倍采样放大器在变压器电流下降到零之前对反激电压进行采样。 此外，从双倍放大器的检测输入端拉出偏移电流，以产生更精确的直流输出电压。 偏移电流响应于温度而产生，以便补偿输出整流器两端的温度感应电压波动。 最终，为了保持恒定的输出电流，PWM控制器响应于输出电压来调制开关频率。

公开(公告)号：US20090040792A1

公开(公告)日：2009-02-12

申请号：US11835807

申请日：2007-08-08

申请人： Ta-yung Yang ,  Tso-Min Chen

发明人： Ta-yung Yang ,  Tso-Min Chen

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1475 ,  Y02B70/1491

摘要： A synchronous rectifying circuit is provided for resonant power converter. An integrated synchronous rectifier comprises a rectifying terminal, a ground terminal a first input terminal and a second input terminal. The rectifying terminal is coupled to the secondary side of a power transformer. The ground terminal is coupled to the output of the power converter. A power transistor is connected between the rectifying terminal and the ground terminal. The first input terminal and the second input terminal are coupled to receive a pulse signal for turning on/off the power transistor. A pulse-signal generation circuit includes an input circuit coupled to receive the switching signal for switching the power transformer of the power converter.

摘要翻译： 为谐振功率转换器提供同步整流电路。 集成同步整流器包括整流端子，接地端子，第一输入端子和第二输入端子。 整流端子耦合到电力变压器的次级侧。 接地端子耦合到功率转换器的输出端。 功率晶体管连接在整流端子和接地端子之间。 第一输入端子和第二输入端子被耦合以接收用于接通/关断功率晶体管的脉冲信号。 脉冲信号发生电路包括耦合以接收切换信号的输入电路，用于切换功率转换器的电力变压器。

公开(公告)号：US07489529B2

公开(公告)日：2009-02-10

申请号：US11269973

申请日：2005-11-08

申请人： Ta-yung Yang

发明人： Ta-yung Yang

IPC分类号： H02M1/12

CPC分类号： H02M3/1563

摘要： A control circuit having frequency modulation is used for reducing the EMI of a power converter. A switching circuit is couple to a feedback circuit to generate a switching signal for regulating an output of the power converter. A first oscillator is equipped to determine a switching frequency of the switching signal. A second oscillator is coupled to the first oscillator to modulate the switching frequency of the switching signal for reduce the EMI of the power converter. A programmable resistor is designed to attenuate the feedback signal of the feedback circuit. The resistance of the programmable resistor is controlled by the output of the second oscillator. Therefore, the output power and the output voltage can be kept constant when the switching frequency is modulated.

摘要翻译： 具有频率调制的控制电路用于降低功率转换器的EMI。 开关电路耦合到反馈电路以产生用于调节功率转换器的输出的开关信号。 装备有第一振荡器来确定开关信号的开关频率。 第二振荡器耦合到第一振荡器以调制开关信号的开关频率，以降低功率转换器的EMI。 可编程电阻器被设计为衰减反馈电路的反馈信号。 可编程电阻器的电阻由第二个振荡器的输出控制。 因此，当调制开关频率时，输出功率和输出电压可以保持恒定。

公开(公告)号：US20090027926A1

公开(公告)日：2009-01-29

申请号：US11782901

申请日：2007-07-25

申请人： Ta-yung Yang ,  Tso-Min Chen

发明人： Ta-yung Yang ,  Tso-Min Chen

IPC分类号： H02M3/335

CPC分类号： H02M3/33592 ,  Y02B70/1475

摘要： A synchronous rectifying circuit is provided for flyback power converter. A pulse generator is utilized to generate a pulse signal in response to a leading edge and a trailing edge of a switching signal. The switching signal is used for switching the transformer of the power converter. An isolation device such as pulse transformer or small capacitors is coupled to the pulse generator for transferring the pulse signal through an isolation barrier of a transformer. A synchronous rectifier includes a power switch and a control circuit. The power switch is connected in between the secondary side of the transformer and the output of the power converter for the rectifying operation. The control circuit having a latch is operated to receive the pulse signal for controlling the power switch.

摘要翻译： 为反激式功率转换器提供同步整流电路。 脉冲发生器用于响应于开关信号的前沿和后沿产生脉冲信号。 开关信号用于切换电源转换器的变压器。 诸如脉冲变压器或小电容器的隔离装置耦合到脉冲发生器，用于通过变压器的隔离栅传递脉冲信号。 同步整流器包括电源开关和控制电路。 电源开关连接在变压器的次级侧和用于整流操作的电源转换器的输出之间。 具有闩锁的控制电路被操作以接收用于控制电源开关的脉冲信号。

公开(公告)号：US07471523B2

公开(公告)日：2008-12-30

申请号：US11464692

申请日：2006-08-15

申请人： Ta-yung Yang

发明人： Ta-yung Yang

IPC分类号： H02M3/335

CPC分类号： H02M3/33507 ,  G01R33/1215

摘要： A detection circuit for detecting the demagnetizing time of a magnetic device is provided. An input circuit is coupled to the magnetic device for detecting a magnetizing voltage and a demagnetizing voltage of the magnetic device. A control circuit is coupled to the input circuit for generating a demagnetizing-time signal in response to the magnetizing voltage, the demagnetizing voltage, and a magnetizing time. The magnetizing time is correlated to the enable period of the magnetizing voltage. The demagnetizing time of the magnetic device is represented by the demagnetizing-time signal.

摘要翻译： 提供了一种用于检测磁性装置的消磁时间的检测电路。 输入电路耦合到磁性装置，用于检测磁性装置的磁化电压和去磁电压。 控制电路耦合到输入电路，用于响应于磁化电压，去磁电压和磁化时间产生去磁时信号。 磁化时间与励磁电压的使能期相关。 磁性装置的去磁时间由去磁时信号表示。

公开(公告)号：US07440298B2

公开(公告)日：2008-10-21

申请号：US11464078

申请日：2006-08-11

申请人： Ta-yung Yang

发明人： Ta-yung Yang

IPC分类号： H02M7/217

CPC分类号： H02M7/217 ,  H02M3/33592 ,  Y02B70/1433 ,  Y02B70/1441 ,  Y02B70/1475

摘要： A synchronous rectification circuit for power converters operable under fixed and/or variable frequencies where no current sense circuit or phase-lock circuit are needed is provided. It has a power switch coupled to a transformer for the rectification. A signal-generation circuit is used for generating a control signal in response to a magnetized voltage of the transformer, a demagnetized voltage of the transformer, and a magnetization period of the transformer. The control signal is coupled to turn on the power switch. The enable period of the control signal is correlated to a demagnetization period of the transformer.

摘要翻译： 提供了在固定和/或可变频率下可操作的电力转换器的同步整流电路，其中不需要电流检测电路或锁相电路。 它具有耦合到用于整流的变压器的电源开关。 信号发生电路用于响应于变压器的磁化电压，变压器的退磁电压和变压器的磁化周期产生控制信号。 控制信号被耦合以打开电源开关。 控制信号的使能期间与变压器的退磁期相关。

公开(公告)号：US20080232142A1

公开(公告)日：2008-09-25

申请号：US11685786

申请日：2007-03-14

申请人： Ta-yung Yang

发明人： Ta-yung Yang

IPC分类号： H02M3/335

CPC分类号： H02M3/33507

摘要： A control circuit controls the output current of the power converter at the primary side of the transformer. The control circuit includes a current-detection circuit for generating a primary-current signal in response to the switching current of the transformer. A voltage-detection circuit is coupled to the transformer to generate a period signal and a discharge-time signal in response to the reflected voltage of the transformer. A signal-process circuit is utilized to generate a current signal in response to the primary-current signal, the period signal and the discharge-time signal. The period signal is correlated to the switching period of the switching signal of the power converter. The discharge-time signal is correlated to the duty cycle of switching current at the secondary-side of the transformer. The current signal is correlated to the output current of the power converter.

摘要翻译： 控制电路控制变压器初级侧的功率转换器的输出电流。 控制电路包括电流检测电路，用于响应于变压器的开关电流产生一次电流信号。 电压检测电路耦合到变压器，以响应于变压器的反射电压产生周期信号和放电时间信号。 信号处理电路用于响应一次电流信号，周期信号和放电时间信号产生电流信号。 周期信号与功率转换器的开关信号的开关周期相关。 放电时间信号与变压器二次侧开关电流的占空比相关。 电流信号与功率转换器的输出电流相关。