公开(公告)号：US20160190916A1

公开(公告)日：2016-06-30

申请号：US14669679

申请日：2015-03-26

Applicant: Richtek Technology Corporation

Inventor： Chien-Fu TANG ,  Isaac Y. CHEN

IPC: H02M3/04 ,  H02M3/24

CPC classification number: H02M3/33507 ,  H02M2001/0003 ,  H02M2001/0022 ,  H02M2001/0048 ,  Y02B70/1491

Abstract: A control circuit of a power converter includes: an input signal detection circuit, configured to operably detect a magnitude of an input signal to generate a detection signal; a clock generation circuit, configured to operably generate a clock signal; an error detection circuit, configured to operably generate an error signal according to a reference signal and a feedback signal; a control signal generation circuit, coupled with the clock generation circuit and the error detection circuit, configured to operably control a switching frequency of a power switch according to the clock signal and the error signal; and a reverse adjusting circuit, coupled with the input signal detection circuit, configured to operably adjust the clock generation circuit or the control signal generation circuit according to the detection signal to configure the switching frequency of the power switch to be inversely proportional to the magnitude of the input signal.

Abstract translation: 功率转换器的控制电路包括：输入信号检测电路，被配置为可操作地检测输入信号的幅度以产生检测信号; 时钟生成电路，被配置为可操作地生成时钟信号; 误差检测电路，被配置为根据参考信号和反馈信号可操作地产生误差信号; 与时钟发生电路和误差检测电路耦合的控制信号产生电路被配置为根据时钟信号和误差信号可操作地控制功率开关的开关频率; 以及与所述输入信号检测电路耦合的反向调整电路，被配置为根据所述检测信号可操作地调整所述时钟生成电路或所述控制信号生成电路，以将所述功率开关的开关频率与所述功率开关的开关频率成反比 输入信号。

公开(公告)号：US20140328087A1

公开(公告)日：2014-11-06

申请号：US14266566

申请日：2014-04-30

Applicant: Richtek Technology Corporation

Inventor： Chien-Fu TANG ,  Jiun-Hung PAN ,  Isaac Y. CHEN

IPC: H02M3/335

CPC classification number: H02M3/156 ,  H02M2001/0009

Abstract: An apparatus and a method for implementing a multiple function pin in a boundary conduction mode power supply, uses a same pin to switch a power switch and to achieve zero current detection to reduce pin count and save cost of a control integrated circuit. A first voltage is applied to the multiple function pin to turn on the power switch, and then a second voltage is applied to the multiple function pin after the power switch has been turned on for a first time, to thereby turn off the power switch. After the power switch has been turned off for a second time, a third voltage is applied to the multiple function pin keep the power switch off. Preferably, a tristate output driver is used to provide the first and second voltages, and a clamping circuit is used to provide the third voltage.

Abstract translation: 在边界导通模式电源中实现多功能引脚的装置和方法，使用相同的引脚切换电源开关，实现零电流检测，减少引脚数，节省控制集成电路的成本。 向多功能引脚施加第一电压以接通电源开关，然后在电源开关第一次接通之后，向多功能引脚施加第二电压，从而关闭电源开关。 电源开关第二次关闭后，第三个电压被施加到多功能引脚上，保持电源开关的不动作。 优选地，使用三态输出驱动器来提供第一和第二电压，并且使用钳位电路来提供第三电压。

公开(公告)号：US20130235633A1

公开(公告)日：2013-09-12

申请号：US13789287

申请日：2013-03-07

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Tsung-Hsi YANG ,  Isaac Y. CHEN ,  Chien-Fu TANG ,  Jiun-Hung PAN

IPC: H02M7/06

CPC classification number: H02M7/06 ,  H02M1/4225 ,  H02M3/156 ,  Y02B70/126

Abstract: A control circuit for a power converter has a current source, a sampling circuit, a signal processing circuit, a driving circuit, and a shared pin. The shared pin is used for coupling with a resistor and a switch. The current source, coupled with the shared pin, provides a current through the shared pin to the resistor in a first period. The sampling circuit, coupled with the shared pin, samples signals on the shared pin for generating a first sampling value and a second sampling value. The signal processing circuit, coupled with the sampling circuit, compares the first sampling value and the second sampling value. The driving circuit generates driving signals for conducting the switch. When the difference of the first sampling value and the second sampling value is less than a predetermined value, the signal processing circuit configures the driving circuit to intermittently conduct the switch in a second period.

Abstract translation: 用于功率转换器的控制电路具有电流源，采样电路，信号处理电路，驱动电路和共享引脚。 共享引脚用于与电阻和开关耦合。 与共享引脚耦合的电流源在第一周期内通过共享引脚提供电流到电阻器。 与共享引脚耦合的采样电路在共享引脚上采样信号以产生第一采样值和第二采样值。 与采样电路耦合的信号处理电路比较第一采样值和第二采样值。 驱动电路产生用于导通开关的驱动信号。 当第一采样值和第二采样值的差小于预定值时，信号处理电路将驱动电路配置为在第二周期内间歇地导通开关。

公开(公告)号：US20130229207A1

公开(公告)日：2013-09-05

申请号：US13778865

申请日：2013-02-27

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Pei-Kai TSENG ,  Chien-Fu TANG ,  Isaac Y. CHEN

IPC: H03K19/003 ,  H03K19/0175

CPC classification number: H03K19/00361 ,  H03K19/017509

Abstract: A floating gate driver includes a level shifter to transmit a set signal and a reset signal to a first output terminal and a second output terminal, respectively. The level shifter includes a first high-voltage transistor, a first current limiter and a first input transistor connected in series between the first output terminal and a ground terminal, and a second high-voltage transistor, a second current limiter and a second input transistor connected in series between the second output terminal and the ground terminal, and the first and second high-voltage transistors are remained on. With this arrangement, the level shifter can transmit signals from low side to high side under better safe operating area and has better noise immunity.

Abstract translation: 浮动栅极驱动器包括电平移位器，用于将设置信号和复位信号分别发送到第一输出端子和第二输出端子。 电平移位器包括第一高压晶体管，第一限流器和串联连接在第一输出端子和接地端子之间的第一输入晶体管，以及第二高压晶体管，第二限流器和第二输入晶体管 串联连接在第二输出端子和接地端子之间，第一和第二高压晶体管保持接通。 通过这种布置，电平移位器可以在更安全的操作区域内将信号从低端传输到高端，并具有更好的抗噪声能力。