公开(公告)号：US10014723B2

公开(公告)日：2018-07-03

申请号：US14258708

申请日：2014-04-22

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： Wei-Jen Huang ,  Shui-Mu Lin

IPC: H01F27/42 ,  H01F37/00 ,  H01F38/00 ,  H02J50/12 ,  H02J5/00 ,  H02J7/02 ,  H02M7/217

CPC classification number: H02J50/12 ,  H02J5/005 ,  H02J7/025 ,  H02M7/217

Abstract: A power management unit, adapted to a wireless power system, includes: a rectifier, converts an AC power received by an input port thereof to a direct-current (DC) voltage outputted by a rectifying output terminal thereof; a first switch, wherein a first protecting capacitor is coupled between one terminal of the input port and a channel thereof; a second switch, wherein a second protecting capacitor is coupled between the other terminal of the input port and a channel thereof; a reference voltage terminal, for providing a reference voltage; and, a comparator, including two input terminals coupled to the rectifying output terminal and the reference voltage terminal respectively, and including an output terminal coupled to both the control terminals of the first switch and the second switch.

公开(公告)号：US09871453B2

公开(公告)日：2018-01-16

申请号：US15267487

申请日：2016-09-16

Applicant: Richtek Technology Corporation

Inventor： Isaac Y. Chen

IPC: H02M3/335 ,  H02H3/027 ,  H02H7/12 ,  H02M1/00 ,  H02M1/32

CPC classification number: H02M3/33507 ,  H02H3/027 ,  H02H7/1213 ,  H02M3/33523 ,  H02M2001/0032 ,  H02M2001/325 ,  Y02B70/16

Abstract: A feedback signal stabilized by a capacitor and related to an output voltage of a power converter is used to acquire the output power information of the power converter, and a control circuit uses a second clock not related to the switching frequency of the power converter to count a duration time of the feedback signal being higher than a threshold. When the duration time is higher than a preset time, an abnormal output power of the power converter is distinguished and the power converter will be turned off. The feedback signal will not vary severely even if the output terminal of the power converter is interfered, and the counted duration time will not be influenced when the switching frequency is changing caused by a load changing.

公开(公告)号：US09781786B2

公开(公告)日：2017-10-03

申请号：US15008289

申请日：2016-01-27

Applicant: Richtek Technology Corporation

Inventor： Jyun-Che Ho ,  Isaac Y. Chen ,  Yi-Wei Lee

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0848

Abstract: A control circuit of a LED driver utilizes a counter to acquire a cycle and a conduction time or a non-conduction time of an AC phase-cut voltage outputted by a TRIAC dimmer. A bleeding signal is determined according to the cycle and the conduction time or the non-conduction time and used for adjusting a bleeding current so as to avoid a flickering of the LED. The control circuit does not need extra pins for coupling a large capacitor, but the bleeding signal can be still acquired. Preferably, the present invention is suitable for an IC of low pin numbers.

公开(公告)号：US09647531B2

公开(公告)日：2017-05-09

申请号：US14526187

申请日：2014-10-28

Applicant: Richtek Technology Corp.

Inventor： Tong-Cheng Jao ,  Yi-Wei Lee ,  Isaac Y. Chen

IPC: H02M1/36 ,  H02M3/335

CPC classification number: H02M1/36 ,  H02M3/33507 ,  H02M3/33523 ,  H02M3/33553

Abstract: A soft-start switching power converter includes a voltage converting circuit and a soft-start circuit. The voltage converting circuit includes a transformer, and a first switch which includes a first terminal connected to the transformer, a second terminal providing a trigger signal, and a control terminal receiving a control signal, and which is controlled to switch between conduction and nonconduction, such that the transformer generates a feedback voltage. The soft-start circuit receives the trigger signal, generates the control signal according to the trigger signal, and determines whether or not to clamp the control signal at a preset voltage level based on the trigger signal.

公开(公告)号：US09629210B2

公开(公告)日：2017-04-18

申请号：US15047154

申请日：2016-02-18

Applicant: Richtek Technology Corporation

Inventor： Chang-Yu Wu ,  Wei-Ming Chiu

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0824 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0842 ,  H05B33/0857 ,  H05B33/0887 ,  Y02B20/341

Abstract: A control chip of a driving circuit for driving a LED array shares a ground terminal with the LED array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.

公开(公告)号：US09356518B2

公开(公告)日：2016-05-31

申请号：US14529111

申请日：2014-10-30

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： An-Tung Chen ,  Li-Wen Fang ,  Chih-Hao Yang

IPC: H02M3/158 ,  H02M1/32 ,  H02M1/00

CPC classification number: H02M3/1584 ,  H02M2001/0045

Abstract: An over-voltage protection circuit is applied to a switching voltage converting circuit. The switching voltage converting circuit manipulates an upper bridge power switch in the circuit, so as to convert an input voltage into an output voltage by an inductor. A channel of the upper bridge power switch and the inductor are coupled to a phase end. The over-voltage protection circuit includes: a comparator, coupled to the switching voltage converting circuit, wherein when a voltage of the phase end is higher than a voltage limiting threshold, an output end of the comparator outputs a first voltage level; and a pulse width detection unit, coupled to the output end of the comparator, wherein when the output end of the comparator remains the first voltage level for a time period longer than a protection period, the pulse width detection unit outputs an over-voltage protection activation signal.

Abstract translation: 过电压保护电路被施加到开关电压转换电路。 开关电压转换电路操纵电路中的上桥式电源开关，以便通过电感将输入电压转换为输出电压。 上桥电源开关和电感器的通道耦合到相端。 所述过电压保护电路包括：比较器，耦合到所述开关电压转换电路，其中当所述相位端的电压高于电压限制阈值时，所述比较器的输出端输出第一电压电平; 以及脉冲宽度检测单元，其连接到所述比较器的输出端，其中当所述比较器的输出端在比保护周期长的时间段内保持第一电压电平时，所述脉冲宽度检测单元输出过电压保护 激活信号。

公开(公告)号：US09263940B2

公开(公告)日：2016-02-16

申请号：US14075717

申请日：2013-11-08

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Chien-Hung Chen ,  Isaac Y. Chen ,  Yi-Wei Lee ,  Jyun-Che Ho

IPC: H02M3/335 ,  H02M1/42

CPC classification number: H02M1/4225 ,  Y02B70/126 ,  Y02P80/112

Abstract: A power converter includes a rectifier and a power factor corrector. The rectifier is to be coupled to an alternating current power source and is configured to output a rectified signal. The power factor corrector includes a correcting circuit and a control circuit. The correcting circuit receives the rectified signal and is configured to generate an output voltage based on the rectified signal and a driving signal. The control circuit is configured to generate a first to-be-compared signal based on the rectified signal, to generate a second to-be-compared signal based on the output voltage, to compare the first and second to-be-compared signals, and to generate the driving signal based on a result of comparison performed thereby.

Abstract translation: 功率转换器包括整流器和功率因数校正器。 整流器被耦合到交流电源，并且被配置为输出整流信号。 功率因数校正器包括校正电路和控制电路。 校正电路接收经整流的信号，并且被配置为基于整流信号和驱动信号产生输出电压。 控制电路被配置为基于整流信号产生第一待比较信号，以基于输出电压产生第二待比较信号，以比较第一和第二待比较信号， 并且基于由此执行的比较结果来产生驱动信号。

公开(公告)号：US09203319B2

公开(公告)日：2015-12-01

申请号：US14713654

申请日：2015-05-15

Applicant: RICHTEK TECHNOLOGY CORP.

Inventor： Jyun-Che Ho ,  Jiun-Hung Pan ,  Chien-Fu Tang ,  Isaac Y. Chen

IPC: H02M3/335 ,  H02M3/36

CPC classification number: H02M3/33507 ,  H02M3/33515 ,  H02M3/33523 ,  H02M3/36

Abstract: A switching power converting apparatus includes a voltage conversion module, a detecting unit, and a switching signal generating unit. The voltage conversion module converts an input voltage into an output voltage associated with a secondary side current, which flows through a secondary winding of a transformer and is generated based on a switching signal. The detecting unit generates a detecting signal based on the output voltage and a predetermined reference voltage. The switching signal generating unit generates the switching signal based on the detecting signal and an adjusting signal so that the secondary side current is gradually increased during a start period of the switching power converting apparatus.

Abstract translation: 开关电源转换装置包括电压转换模块，检测单元和开关信号产生单元。 电压转换模块将输入电压转换为与次级侧电流相关联的输出电压，该二次侧电流流过变压器的次级绕组并且基于开关信号产生。 检测单元基于输出电压和预定参考电压产生检测信号。 开关信号生成单元根据检测信号和调整信号生成开关信号，使得在开关电力转换装置的启动期间次级侧电流逐渐增加。

公开(公告)号：US20150142348A1

公开(公告)日：2015-05-21

申请号：US14195557

申请日：2014-03-03

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： Wei-Jen Huang ,  Shui-Mu Lin

IPC: G01R21/133 ,  G01V3/00

CPC classification number: G01R21/133 ,  G01V3/00 ,  H02J5/005 ,  H02J7/025 ,  H02J17/00 ,  H02J50/10 ,  H02J50/60

Abstract: A power calculating method, adapted to a wireless power system, includes the following steps: first, multi-sampling input or output current of a regulator in the power receiving end, and performing root-men-square calculation accordingly to derive a current RMS value; second, multi-sampling input or output voltage of the regulator, and performing a root-men-square calculation accordingly to derive a voltage RMS value; third, multiplying the voltage RMS value to the current RMS value and a cosine of an angle to derive a regulating power value; fourth, dividing the regulating power value by a power efficiency value to derive a receiving power value; finally, transmitting the receiving power value to a power transmitting end of the wireless power system for performing foreign object detection.

Abstract translation: 一种适用于无线电力系统的功率计算方法，包括以下步骤：首先，对受电端的稳压器的多采样输入或输出电流进行相应的平方根计算，得出电流RMS值 ; 第二，调节器的多采样输入或输出电压，并且相应地执行根平均计算以导出电压RMS值; 第三，将电压RMS值乘以电流RMS值和角度的余弦以导出调节功率值; 第四，将调节功率值除以功率效率值以得到接收功率值; 最后，将接收功率值发送到用于进行异物检测的无线电力系统的发送端。

公开(公告)号：US20150109060A1

公开(公告)日：2015-04-23

申请号：US14244948

申请日：2014-04-04

Applicant: RICHTEK TECHNOLOGY CORP

Inventor： Yen-Yin Huang ,  Ming-Shih Yu

IPC: H03L7/085

CPC classification number: H03L1/00

Abstract: A process, voltage, and temperature compensated oscillator, formed on an integrate circuit implemented by a semiconductor process, receives a supply voltage and includes: a variation bias unit provided with a variation bias output terminal and generating a process, voltage, and temperature compensated signal; a controlled oscillating unit provided with a control input terminal and an oscillating output and determining a signal oscillating frequency at the oscillating output terminal according to a signal at the control input terminal; and a tuning unit provided with a tuning input terminal, a compensating input terminal, a control output terminal, and a variable-parameter element, wherein the variable-parameter element includes a parameter and is coupled to the control output terminal, and the tuning unit determines the parameter according to a signal at the variation bias output terminal and a voltage signal or a digital signal received at the tuning input terminal.

Abstract translation: 形成在由半导体工艺实现的集成电路上的工艺，电压和温度补偿振荡器接收电源电压，并包括：设置有变化偏置输出端子并产生过程，电压和温度补偿信号的变化偏置单元 ; 控制振荡单元，设置有控制输入端子和振荡输出端，并根据控制输入端子处的信号确定振荡输出端子处的信号振荡频率; 以及设置有调谐输入端子，补偿输入端子，控制输出端子和可变参数元件的调谐单元，其中所述可变参数元件包括参数并耦合到所述控制输出端子，并且所述调谐单元 根据变化偏置输出端子处的信号和在调谐输入端子处接收的电压信号或数字信号来确定参数。