公开(公告)号：US20070139095A1

公开(公告)日：2007-06-21

申请号：US11327155

申请日：2006-01-05

申请人： Lieyi Fang ,  Shifeng Zhao ,  Zhiliang Chen ,  Zhenhua Li

发明人： Lieyi Fang ,  Shifeng Zhao ,  Zhiliang Chen ,  Zhenhua Li

IPC分类号： H03K17/687

CPC分类号： H03K17/60 ,  H02M1/08 ,  H02M3/33507 ,  H03K17/0826 ,  H03K17/22 ,  H03K17/605 ,  H03K17/64

摘要： A system and method for driving a bipolar junction transistor is provided. The system includes a first transistor including a first gate, a first terminal, and a second terminal. The first gate is configured to receive a first control signal. Additionally, the system includes a second transistor including a second gate, a third terminal, and a fourth terminal. The second gate is configured to receive a second control signal. Moreover, the system includes a first resistor including a fifth terminal and a sixth terminal. The fifth terminal is connected to the first terminal, and the sixth terminal is biased to a first predetermined voltage. The fourth terminal is biased to a second predetermined voltage. The second terminal and the third terminal are connected at a node, and the node is connected to a base for a bipolar junction transistor.

摘要翻译： 提供一种用于驱动双极结型晶体管的系统和方法。 该系统包括第一晶体管，其包括第一栅极，第一端子和第二端子。 第一门被配置为接收第一控制信号。 另外，该系统包括包括第二栅极，第三端子和第四端子的第二晶体管。 第二门被配置为接收第二控制信号。 此外，该系统包括包括第五端子和第六端子的第一电阻器。 第五端子连接到第一端子，第六端子被偏置到第一预定电压。 第四端子偏置到第二预定电压。 第二端子和第三端子连接在节点处，并且节点连接到用于双极结型晶体管的基极。

公开(公告)号：US20070041228A1

公开(公告)日：2007-02-22

申请号：US11213657

申请日：2005-08-26

申请人： Lieyi Fang ,  Shifeng Zhao ,  Bo Li ,  Zhiliang Chen

发明人： Lieyi Fang ,  Shifeng Zhao ,  Bo Li ,  Zhiliang Chen

IPC分类号： H02H7/10

CPC分类号： H02M3/33507 ,  H02M1/32

摘要： System and method for protecting a power converter. The system includes a first comparator configured to receive a threshold signal and a first signal and to generate a comparison signal. The first signal is a sum of a second signal and a third signal, and the third signal is associated with an input current for a power converter. Additionally, the system includes a pulse-width-modulation generator configured to receive the comparison signal and generate a modulation signal in response to the comparison signal, and a switch configured to receive the modulation signal and control the input current for the power converter. An amplitude for the first signal becomes larger if an amplitude for the input voltage becomes larger. The second signal is generated by receiving an input voltage for the power converter, converting the received input voltage to a fourth signal, and converting the fourth signal to the second signal.

摘要翻译： 保护电源转换器的系统和方法。 该系统包括被配置为接收阈值信号和第一信号并产生比较信号的第一比较器。 第一信号是第二信号和第三信号的和，并且第三信号与功率转换器的输入电流相关联。 另外，该系统包括：脉冲宽度调制发生器，被配置为接收比较信号并响应于比较信号产生调制信号;以及开关，被配置为接收调制信号并控制功率转换器的输入电流。 如果输入电压的幅度变大，则第一信号的振幅变大。 通过接收功率转换器的输入电压，将接收到的输入电压转换为第四信号，并将第四信号转换为第二信号，产生第二信号。

公开(公告)号：US20060256492A1

公开(公告)日：2006-11-16

申请号：US11125968

申请日：2005-05-10

申请人： Shifeng Zhao ,  Cetin Kaya ,  James Teng ,  Claus Neesgaard ,  Lieyi Fang ,  Jeff Berwick

发明人： Shifeng Zhao ,  Cetin Kaya ,  James Teng ,  Claus Neesgaard ,  Lieyi Fang ,  Jeff Berwick

IPC分类号： H02H3/08

CPC分类号： H03K17/0822 ,  H03K17/162

摘要： A system and method is provided for detecting an over-current condition in a power field-effect transistor (FET). In one embodiment, an over-current detection circuit for detecting an over-current condition in a power FET comprises a current generator circuit operative to generate a reference current and a plurality of matched FETs operative to receive the reference current and provide a reference voltage, the matched FETs being matched to each other and to the power FET. The over-current detection circuit also comprises a comparator operative to measure a drain-to-source voltage of the power FET and to provide an output that indicates that the drain-to-source voltage of the power FET has exceeded the reference voltage.

摘要翻译： 提供了用于检测功率场效应晶体管（FET）中的过电流状态的系统和方法。 在一个实施例中，用于检测功率FET中的过电流状态的过电流检测电路包括用于产生参考电流的电流发生器电路和用于接收参考电流并提供参考电压的多个匹配FET， 匹配的FET彼此匹配并连接到功率FET。 过电流检测电路还包括比较器，用于测量功率FET的漏极 - 源极电压，并提供指示功率FET的漏极 - 源极电压已经超过参考电压的输出。

公开(公告)号：US09331567B2

公开(公告)日：2016-05-03

申请号：US13323458

申请日：2011-12-12

申请人： Yuan Lin ,  Lieyi Fang

发明人： Yuan Lin ,  Lieyi Fang

IPC分类号： H02M1/44 ,  H02M3/335 ,  H02M1/00

CPC分类号： H02M1/44 ,  H02M3/33507 ,  H02M2001/0058 ,  Y02B70/1433 ,  Y02B70/1491

摘要： System and method are provided for regulating a power converter. The system includes a signal processing component configured to receive a first input signal and a second input signal, process information associated with the first input signal and the second input signal, and output a drive signal to a switch based on at least information associated with the first input signal and the second input signal. The first input signal is associated with at least a feedback signal related to an output voltage of the power converter. The second input signal is associated with at least a primary current flowing through a primary winding of the power converter. The signal processing component is further configured to change a peak value of the primary current within a first predetermined range, and change the switching frequency of the power converter within a second predetermined range.

摘要翻译： 提供了用于调节功率转换器的系统和方法。 该系统包括被配置为接收第一输入信号和第二输入信号的信号处理部件，与第一输入信号和第二输入信号相关联的处理信息，并且基于至少基于与第二输入信号相关联的信息将驱动信号输出到开关 第一输入信号和第二输入信号。 第一输入信号至少与功率转换器的输出电压有关的反馈信号相关联。 第二输入信号与流过功率转换器的初级绕组的至少一个初级电流相关联。 信号处理部件还被配置为将初级电流的峰值改变在第一预定范围内，并且将功率转换器的开关频率改变在第二预定范围内。

公开(公告)号：US08947012B2

公开(公告)日：2015-02-03

申请号：US13558168

申请日：2012-07-25

申请人： Qiang Luo ,  Lieyi Fang ,  Zhiliang Chen

发明人： Qiang Luo ,  Lieyi Fang ,  Zhiliang Chen

IPC分类号： G05F1/00 ,  H05B37/02 ,  H05B39/04 ,  H05B41/36 ,  H05B37/00 ,  H05B39/00 ,  H05B41/00 ,  H05B33/08

CPC分类号： H05B33/0842 ,  H05B33/0827 ,  H05B37/02

摘要： Systems and methods are provided for regulating a string current flowing through a string of one or more light emitting diodes. A system controller includes a first controller terminal, a second controller terminal and a third controller terminal. The first controller terminal is coupled to a base terminal of a bipolar junction transistor, the bipolar junction transistor further including an emitter terminal and a collector terminal, the collector terminal being connected to the string of one or more light emitting diodes. The second controller terminal is coupled to the emitter terminal of the bipolar junction transistor and to a first resistor terminal of a resistor associated with a resistance. The third controller terminal is coupled to a second resistor terminal of the resistor. In addition, the system controller is configured to receive a reference voltage, receive an emitter voltage, and output a base current.

摘要翻译： 提供了用于调节流过一个或多个发光二极管串的串电流的系统和方法。 系统控制器包括第一控制器端子，第二控制器端子和第三控制器端子。 第一控制器端子耦合到双极结型晶体管的基极端子，所述双极结型晶体管还包括发射极端子和集电极端子，所述集电极端子连接到一个或多个发光二极管的串。 第二控制器端子耦合到双极结型晶体管的发射极端子和与电阻相关联的电阻器的第一电阻器端子。 第三控制器端子耦合到电阻器的第二电阻器端子。 此外，系统控制器被配置为接收参考电压，接收发射极电压并输出基极电流。

公开(公告)号：US08897037B2

公开(公告)日：2014-11-25

申请号：US12892580

申请日：2010-09-28

申请人： Yingchieh Lin ,  Bo Li ,  Lieyi Fang

发明人： Yingchieh Lin ,  Bo Li ,  Lieyi Fang

IPC分类号： H02M3/335 ,  H02M1/00 ,  H02M5/42 ,  H02M7/00

CPC分类号： H02M3/33515 ,  H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： Power conversion system and method. The system includes a first capacitor, a second capacitor, and a plurality of diodes including a first diode, a second diode, a third diode, and a fourth diode. Additionally, the system includes a fifth diode including a first anode and a first cathode and a sixth diode including a second anode and a second cathode. Moreover, the system includes a primary winding, and a secondary winding coupled to the primary winding. The first anode is connected to a first input terminal, and the second anode is connected to a second input terminal. The first input terminal and the second input terminal are configured to receive an input voltage. The secondary winding is configured to generate an output voltage based on at least information associated with the input voltage.

摘要翻译： 电力转换系统及方法。 该系统包括第一电容器，第二电容器和包括第一二极管，第二二极管，第三二极管和第四二极管的多个二极管。 另外，该系统包括包括第一阳极和第一阴极的第五二极管和包括第二阳极和第二阴极的第六二极管。 此外，该系统包括初级绕组和耦合到初级绕组的次级绕组。 第一阳极连接到第一输入端，第二阳极连接到第二输入端。 第一输入端子和第二输入端子被配置为接收输入电压。 次级绕组被配置为基于至少与输入电压相关联的信息来产生输出电压。

公开(公告)号：US08891256B2

公开(公告)日：2014-11-18

申请号：US13164608

申请日：2011-06-20

申请人： Lieyi Fang ,  Guo Wei Lin

发明人： Lieyi Fang ,  Guo Wei Lin

IPC分类号： H02M3/335 ,  H02M1/00

CPC分类号： H02M3/33507 ,  H02M3/33523 ,  H02M2001/0019

摘要： System and method for regulating a power converter. The system includes a comparator configured to receive a first signal and a second signal and generate a comparison signal based on at least information associated with the first signal and the second signal. The first signal is associated with at least an output current of a power converter. Additionally, the system includes a pulse-width-modulation generator configured to receive at least the comparison signal and generate a modulation signal based on at least information associated with the comparison signal, and a driver component configured to receive the modulation signal and output a drive signal to a switch to adjust a primary current flowing through a primary winding of the power converter. The modulation signal is associated with a modulation frequency corresponding to a modulation period.

摘要翻译： 用于调节功率转换器的系统和方法。 该系统包括比较器，其被配置为接收第一信号和第二信号，并且至少基于与第一信号和第二信号相关联的信息产生比较信号。 第一信号与功率转换器的至少一个输出电流相关联。 另外，该系统包括脉冲宽度调制发生器，其被配置为至少接收比较信号，并且至少基于与比较信号相关联的信息产生调制信号;以及驱动器部件，被配置为接收调制信号并输出​​驱动器 信号到开关以调节流过功率转换器的初级绕组的初级电流。 调制信号与对应于调制周期的调制频率相关联。

公开(公告)号：US08811042B2

公开(公告)日：2014-08-19

申请号：US13323491

申请日：2011-12-12

申请人： Lieyi Fang

发明人： Lieyi Fang

IPC分类号： H02M3/335

CPC分类号： H02M1/32 ,  H02H3/06 ,  H02H7/1213 ,  H02H7/1222 ,  H02M1/08 ,  H02M3/33507 ,  H02M3/33523

摘要： System and method are provided for protecting a power converter. The system includes a first comparator, and an off-time component. The first comparator is configured to receive a sensing signal and a first threshold signal and generate a first comparison signal based on at least information associated with the sensing signal and the first threshold signal, the power converter being associated with a switching frequency and further including a switch configured to affect the primary current. The off-time component is configured to receive the first comparison signal and generate an off-time signal based on at least information associated with the first comparison signal. The off-time component is further configured to, if the first comparison signal indicates the sensing signal to be larger than the first threshold signal in magnitude, generate the off-time signal to keep the switch to be turned off for at least a predetermined period of time.

摘要翻译： 提供了用于保护功率转换器的系统和方法。 该系统包括第一比较器和关断时间部件。 第一比较器被配置为接收感测信号和第一阈值信号，并且至少基于与感测信号和第一阈值信号相关联的信息产生第一比较信号，功率转换器与开关频率相关联，还包括一个 开关配置为影响初级电流。 关闭时间部件被配置为接收第一比较信号，并且至少基于与第一比较信号相关联的信息产生关闭时间信号。 断开时间分量还被配置为如果第一比较信号在大小上指示感测信号大于第一阈值信号，则产生关闭时间信号以使开关断开至少预定时段 的时间。

公开(公告)号：US08587226B2

公开(公告)日：2013-11-19

申请号：US12958275

申请日：2010-12-01

申请人： Lieyi Fang ,  Changshan Zhang ,  Zhiliang Chen ,  Shifeng Zhao

发明人： Lieyi Fang ,  Changshan Zhang ,  Zhiliang Chen ,  Shifeng Zhao

IPC分类号： H05B37/02 ,  H05B41/16

CPC分类号： H05B41/2822

摘要： System and method for driving a plurality of cold-cathode fluorescent lamps. The system includes a subsystem configured to receive at least a DC voltage and generate a first AC voltage in response to at least the DC voltage, a power converter configured to receive the first AC voltage and convert the first AC voltage to at least a second AC voltage, and a plurality of current balancing devices. Each of the plurality of current balancing devices is configured to receive two currents and balance the two currents. The power converter and the plurality of current balancing devices are capable of being directly or indirectly coupled to a plurality of cold-cathode fluorescent lamps.

摘要翻译： 用于驱动多个冷阴极荧光灯的系统和方法。 该系统包括被配置为接收至少DC电压并响应于至少DC电压产生第一AC电压的子系统，被配置为接收第一AC电压并将第一AC电压转换为至少第二AC 电压和多个电流平衡装置。 多个电流平衡装置中的每一个配置成接收两个电流并平衡两个电流。 功率转换器和多个电流平衡装置能够直接或间接耦合到多个冷阴极荧光灯。

公开(公告)号：US20130272036A1

公开(公告)日：2013-10-17

申请号：US13466808

申请日：2012-05-08

申请人： Lieyi Fang

发明人： Lieyi Fang

IPC分类号： H02M3/335

CPC分类号： H02M3/33515 ,  H02M3/33507 ,  H02M2001/0032 ,  Y02B70/16

摘要： System and method for regulating a power conversion system. A system controller for regulating a power conversion system includes a first controller terminal and a second controller terminal. The system controller is configured to receive at least an input signal at the first controller terminal, and generate a gate drive signal at the second controller terminal based on at least information associated with the input signal to turn on or off a transistor in order to affect a current associated with a secondary winding of the power conversion system. The system controller is further configured to, if the input signal is larger than a first threshold, generate the gate drive signal at a first logic level to turn off the transistor.