公开(公告)号：US20160049865A1

公开(公告)日：2016-02-18

申请号：US14809699

申请日：2015-07-27

Applicant: Richtek Technology Corp.

Inventor： Jyun-Che HO ,  Tzu-Chen LIN ,  Isaac Y. CHEN ,  Yi-Wei LEE

IPC: H02M1/36 ,  H02M3/335

CPC classification number: H02M1/36 ,  H02M3/33507 ,  H02M2001/327

Abstract: A fast start-up circuit and a method of a flyback power supply utilize a charging current that is related to an input voltage of the flyback power supply to charge a control terminal of a power switch of the flyback power supply during a start-up mode. Accordingly, the power switch can be switched, and a supply voltage of the flyback power supply rises. When an output terminal of the flyback power supply occurs a short circuit, the fast start-up circuit and the method of the present invention will decrease a maximum of a current through the power switch, thereby avoiding that the power switch is overheating.

Abstract translation: 快速启动电路和回扫电源的方法利用与回扫电源的输入电压相关的充电电流，以在启动模式期间对反激式电源的电源开关的控制端子充电 。 因此，可以切换电源开关，并且回扫电源的电源电压上升。 当回扫电源的输出端子发生短路时，快速启动电路和本发明的方法将减小通过电源开关的电流的最大值，从而避免电源开关过热。

公开(公告)号：US20140192564A1

公开(公告)日：2014-07-10

申请号：US13896631

申请日：2013-05-17

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chien-Fu TANG ,  Tzu-Chen LIN ,  Isaac Y. CHEN

IPC: H02M7/217

CPC classification number: H02M3/33523 ,  H02M1/36 ,  H02M3/33592 ,  Y02B70/1475

Abstract: A switching power converting apparatus is capable of converting an input voltage to an output voltage, and includes a transformer, a primary side control module, and a secondary side control module. The secondary side control module utilizes voltage clamping techniques or current-drawing techniques to stop self-excited conversion from the input voltage to the output voltage when the output voltage is greater than a predetermined target voltage, or utilizes a non-self-excited conversion architecture.

Abstract translation: 开关电力转换装置能够将输入电压转换为输出电压，并且包括变压器，初级侧控制模块和次级侧控制模块。 次级侧控制模块利用电压钳位技术或电流绘制技术在输出电压大于预定目标电压时停止从输入电压到输出电压的自激变换，或利用非自激转换结构 。

公开(公告)号：US20140139043A1

公开(公告)日：2014-05-22

申请号：US14165406

申请日：2014-01-27

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chi-Hua LIN ,  Chien-Fu TANG ,  Isaac Y. CHEN ,  An-Tung CHEN

IPC: H02B1/24

CPC classification number: H02B1/24 ,  H04R3/007 ,  Y10T307/74 ,  Y10T307/766

Abstract: A power off delay circuit includes a switch connected between an external power input terminal and an internal power supply terminal, a capacitor connected to the internal power supply terminal, and a hysteresis comparator to switch the switch according to the voltages of the external power input terminal and the internal power supply terminal. During on-time of the switch, the external power input terminal is connected to the internal power supply terminal and the capacitor can be charged by the external power source. When the switch is off, the capacitor provides electric power for an internal circuit. Application of the power off delay circuit to an audio system may eliminate the turn-off pops of the audio system.

Abstract translation: 断电延迟电路包括连接在外部电源输入端子和内部电源端子之间的开关，连接到内部电源端子的电容器和滞后比较器，用于根据外部电力输入端子的电压来切换开关 和内部电源端子。 在接通时，外部电源输入端子连接到内部电源端子，电容器可以通过外部电源充电。 当开关关闭时，电容为内部电路提供电力。 将断电延迟电路应用于音频系统可以消除音频系统的关闭声音。

公开(公告)号：US20130169370A1

公开(公告)日：2013-07-04

申请号：US13772539

申请日：2013-02-21

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chien-Fu TANG ,  Isaac Y. CHEN

IPC: H03B29/00

CPC classification number: H03K3/84 ,  G06F1/04 ,  H02M1/44 ,  H03B29/00 ,  H03K17/16

Abstract: An oscillator generates a clock signal according to a voltage, a current and a capacitance, and a frequency jitter circuit and method use a random number to modulate the voltage, the current or the capacitance, or a count value to modulate the capacitance, to jitter the frequency of the clock signal.

公开(公告)号：US20150048750A1

公开(公告)日：2015-02-19

申请号：US14334574

申请日：2014-07-17

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Tong-Cheng JAO ,  Yi-Wei LEE ,  Isaac Y. CHEN

IPC: H05B33/08 ,  H02M7/217

CPC classification number: H05B33/0815 ,  H02M7/2176 ,  H02M2001/0045 ,  H05B33/0812 ,  Y02B20/343 ,  Y02B20/345 ,  Y02B20/346 ,  Y02B20/347

Abstract: A light emitting system includes a series connection of a light emitting unit and a variable current source, and a voltage conversion device that includes a rectifier circuit and an output circuit. The rectifier circuit rectifies an AC voltage to generate a rectified voltage across a first rectifier output coupled to one end of the series connection of the light emitting unit and the variable current source, and a second rectifier output. The output circuit is coupled between the second rectifier output and another end of the series connection of the light emitting unit and the variable current source, and is configured to generate a direct-current (DC) output voltage.

Abstract translation: 发光系统包括发光单元和可变电流源的串联连接，以及包括整流电路和输出电路的电压转换装置。 整流电路对AC电压进行整流，以在耦合到发光单元和可变电流源的串联连接的一端的第一整流器输出和第二整流器输出之间产生整流电压。 输出电路耦合在第二整流器输出和发光单元与可变电流源的串联连接的另一端之间，并被配置为产生直流（DC）输出电压。