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公开(公告)号：US09655185B2
公开(公告)日：2017-05-16
申请号：US14920240
申请日：2015-10-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jiun-Hung Pan , Tong-Cheng Jao , Yi-Wei Lee , Isaac Y. Chen
IPC: H05B33/08
CPC classification number: H05B33/083 , Y02B20/341 , Y02B20/345
Abstract: A linear LED driver comprises a transistor having an input terminal coupled to a LED. When the transistor is turned on, the LED is lighted. The linear LED driver further includes a protection circuit for judging whether an instant high voltage variation occurs or not according to at least one of the voltages of a control terminal and an output terminal of the transistor so as to achieve a protection function.
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公开(公告)号：US09451661B2
公开(公告)日：2016-09-20
申请号：US15018309
申请日：2016-02-08
Applicant: Richtek Technology Corporation
Inventor： Tong-Cheng Jao , Yi-Wei Lee , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: H05B33/0845 , H05B33/083
Abstract: A linear LED driver includes a voltage supply terminal providing a driving voltage, at least one first transistor, each of which has an input terminal coupled to a respective LED, and a bleeder circuit. When the voltage of the output terminal of each of the at least one first transistor is lower than a first threshold and a power voltage is higher than a second threshold, the bleeder circuit will generate a bleeder current to discharge the voltage supply terminal so as to prevent the LEDs from flickering. The bleeder circuit detects the voltage of the output terminal of each of the at least one first transistor. Therefore, whether the LEDs are lighted up can be confirmed so that the bleeder current can be provided at properly time point.
Abstract translation: 线性LED驱动器包括提供驱动电压的电压供应端子，至少一个第一晶体管，每个第一晶体管具有耦合到相应LED的输入端子和泄放电路。 当所述至少一个第一晶体管中的每一个的输出端子的电压低于第一阈值并且电源电压高于第二阈值时，所述泄放电路将产生泄放电流以对所述电压供应端子进行放电，以便 防止LED闪烁。 泄放电路检测至少一个第一晶体管中的每一个的输出端子的电压。 因此，可以确认LED是否点亮，从而可以在正确的时间点设置泄放电流。
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公开(公告)号：US09276473B1
公开(公告)日：2016-03-01
申请号：US14591250
申请日：2015-01-07
Applicant: RICHTEK TECHNOLOGY CORP
Inventor： An-Tung Chen , Li-Wen Fang , Chih-Hao Yang , Yu-Chiao Hsieh
CPC classification number: H02M3/158 , H02M3/156 , H02M3/1588 , H02M2001/0022 , Y02B70/1466
Abstract: A voltage converting controller is applied to a switching voltage converting circuit, in which the voltage converting controller periodically operates a high-side power switch and a low-side power switch in the switching voltage converting circuit with a high-side control signal and a low-side control signal, respectively, so as to convert an input voltage into an output voltage via an inductor. Defining an ideal duty cycle as the rating value of the output voltage divided by the value of the input voltage, when the ideal duty cycle is less than one threshold duty cycle, then the period of the high-side control signal is a constant; and when the ideal duty cycle is greater than the threshold duty cycle, the period of the high-side control signal and the period of the ideal duty cycle are positively correlated.
Abstract translation: 电压转换控制器被应用于开关电压转换电路，其中电压转换控制器周期性地操作具有高侧控制信号和低电平的开关电压转换电路中的高侧电源开关和低侧电源开关 控制信号，以便通过电感将输入电压转换为输出电压。 将理想的占空比定义为输出电压的额定值除以输入电压的值，当理想占空比小于一个阈值占空比时，则高边控制信号的周期为常数; 并且当理想占空比大于阈值占空比时，高侧控制信号的周期和理想占空比的周期是正相关的。
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公开(公告)号：US09215771B2
公开(公告)日：2015-12-15
申请号：US13973681
申请日：2013-08-22
Applicant: RICHTEK TECHNOLOGY CORP.
Inventor： Chien-Hua Lin , Shui-Mu Lin
CPC classification number: H05B33/0842
Abstract: A light emitting diode driver includes: a serial-to-parallel conversion unit converting, based on a reference clock signal, a serial input signal carrying a number (N) of M-bit gray codes into a parallel input signal carrying the M-bit gray codes; a counting unit counting an output control signal to output a counting value; a data buffer unit storing, based on a latch signal, the M-bit gray codes carried by the parallel input signal, and outputting, based on the counting value and the M-bit gray codes, an N-bit signal consisting of N bits, each of which is an ith one of M bits of a respective M-bit gray code, where i is associated with the counting value; and an output unit generating a number (N) of driving current signals based on at least the N-bit signal.
Abstract translation: 发光二极管驱动器包括：串行到并行转换单元，将基于参考时钟信号的携带M位灰度代码的（N）个M位的串行输入信号转换为携带M位的并行输入信号 灰色代码; 计数单元，对输出控制信号进行计数以输出计数值; 数据缓冲器单元，基于锁存信号存储并行输入信号所携带的M位灰色代码，并根据计数值和M位灰度代码输出由N位组成的N位信号 ，其中每个是相应M位灰度码的M位中的第i个，其中i与计数值相关联; 以及输出单元，至少基于N位信号生成数量（N）个驱动电流信号。
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85.发明授权公开(公告)号：US09203295B2
公开(公告)日：2015-12-01
申请号：US13611416
申请日：2012-09-12
Applicant: Yen-Te Lee , Kuo-Chi Liu , Fu-Sheng Tsai , Kuang-Feng Li , Chung-Cheng Chang , Jiun-Hung Pan , Chien-Fu Tang , Isaac Y. Chen
Inventor： Yen-Te Lee , Kuo-Chi Liu , Fu-Sheng Tsai , Kuang-Feng Li , Chung-Cheng Chang , Jiun-Hung Pan , Chien-Fu Tang , Isaac Y. Chen
CPC classification number: H02M1/126 , H02M2001/0048 , H02M2001/322 , Y02B70/1491
Abstract: A bleeding circuit and method for an electromagnetic interference filter detect whether or not an AC power source connected to the electromagnetic interference filter is removed, establish a discharge path for discharging a capacitor of the electromagnetic interference filter once the connected AC power source is removed, and cut off the discharge path during the AC power source is in connection to the electromagnetic interference filter for decreasing power consumption of the electromagnetic interference filter.
Abstract translation: 一种用于电磁干扰滤波器的泄放电路和方法，检测连接到电磁干扰滤波器的AC电源是否被去除，一旦连接的AC电源被去除，建立用于放电电磁干扰滤波器的电容器的放电路径，以及 在交流电源期间切断放电路径与电磁干扰滤波器相连，以降低电磁干扰滤波器的功耗。
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Patent Agency Ranking
公开(公告)号：US09158315B2
公开(公告)日：2015-10-13
申请号：US13900181
申请日：2013-05-22
Applicant: Richtek Technology Corporation
Inventor： Wen-Wei Chen
CPC classification number: G05F1/46 , H02M3/158 , H02M2001/0003
Abstract: A constant on time mode power supplier uses longer constant on time when the output voltage of the constant on time mode power supplier is drooped due to load variation, to increase energy provided to the output of the constant on time mode power supplier for preventing the output voltage from undershooting and shortening the time for the output voltage to recover stable.
Abstract translation: 恒定的时间模式电源供应商由于负载变化而使恒定导通时间模式电源的输出电压下降，使用更长的恒定导通时间，以增加提供给恒定时间模式电源的输出的能量，以防止输出 电压不足，缩短输出电压恢复稳定的时间。
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公开(公告)号：US09093914B2
公开(公告)日：2015-07-28
申请号：US13871286
申请日：2013-04-26
Applicant: RICHTEK TECHNOLOGY CORP.
Inventor： Pei Kai Tseng , Chien Fu Tang , Isaac Y. Chen
CPC classification number: H02M1/36 , H02J7/0016 , H02J7/345 , H02M3/07
Abstract: A bootstrap circuit includes: a charging voltage source; a charging diode, having an anode coupled to the charging voltage source; a high-voltage transistor, having a control terminal defined as a first connecting node and a channel coupled between a cathode of the charging diode and a bootstrap capacitor; a logic control circuit, having a first and a second logic outputs, and a logic input for receiving a charging command; a high-voltage control transistor, having a control terminal defined as a second connecting node and a channel coupled between charging voltage source and the first connecting node; a cut-off resistor, coupled between the first and the second connecting nodes; a charging control transistor, having a channel coupled between the second connecting node and a ground terminal, and a control terminal coupled to the second logic output; a control capacitor, coupled between the first connecting node and the first logic output.
Abstract translation: 引导电路包括：充电电压源; 充电二极管，具有耦合到所述充电电压源的阳极; 具有被定义为第一连接节点的控制端子和耦合在充电二极管的阴极和自举电容器之间的通道的高压晶体管; 具有第一和第二逻辑输出的逻辑控制电路和用于接收充电命令的逻辑输入; 高压控制晶体管，其具有被定义为第二连接节点的控制端子和耦合在充电电压源与第一连接节点之间的通道; 截止电阻器，耦合在所述第一和第二连接节点之间; 具有耦合在第二连接节点和接地端子之间的通道的充电控制晶体管和耦合到第二逻辑输出的控制端子; 耦合在第一连接节点和第一逻辑输出之间的控制电容器。
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公开(公告)号：US20150137611A1
公开(公告)日：2015-05-21
申请号：US14258708
申请日：2014-04-22
Applicant: RICHTEK TECHNOLOGY CORP
Inventor： Wei-Jen Huang , Shui-Mu Lin
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.
Abstract translation: 一种适用于无线电力系统的电力管理单元，包括：整流器，将由其输入端口接收的交流电力转换成由其整流输出端子输出的直流（DC）电压; 第一开关，其中第一保护电容器耦合在所述输入端口的一个端子和其沟道之间; 第二开关，其中第二保护电容器耦合在所述输入端口的另一端和其通道之间; 参考电压端子，用于提供参考电压; 以及包括分别耦合到整流输出端子和参考电压端子的两个输入端子的比较器，并且包括耦合到第一开关和第二开关的两个控制端子的输出端子。
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公开(公告)号：US20140354163A1
公开(公告)日：2014-12-04
申请号：US14066268
申请日：2013-10-29
Applicant: RICHTEK TECHNOLOGY CORP.
Inventor： Chih-Feng Huang , Kuo-Chin Chiu
IPC: H05B33/08
CPC classification number: H05B33/083
Abstract: An LED driving device includes: a rectifying circuit for outputting a DC voltage to a string of M LED units; (M−1) first switching circuits each coupled between a corresponding one of first to (M−1)th LED units and ground; and a second switching circuit coupled between an Mth LED unit and ground. When the DC voltage is sufficient to turn on first to kth LED units, where 1≦k≦M, the kth LED unit is coupled to ground through first and second conductive paths provided by a resistor unit, and a corresponding first switching circuit or the second switching circuit, and each of the first to (k−1)th LED units is coupled to ground through a third conductive path provided by a corresponding first switching circuit and the resistor unit.
Abstract translation: 一种LED驱动装置，包括：整流电路，用于向一串M LED单元输出DC电压; （M-1）个第一开关电路，每个第一开关电路分别耦合在第一至第（M-1）个LED单元中的相应一个LED单元和地之间; 以及耦合在第M个LED单元和地之间的第二开关电路。 当直流电压足以使第一至第九LED单元接通时，其中第一LED单元通过由电阻器单元提供的第一和第二导电路径以及相应的第一开关电路或 第二开关电路，并且第一至第（k-1）个LED单元中的每一个通过由相应的第一开关电路和电阻器单元提供的第三导电路径耦合到地。
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公开(公告)号：US08860384B2
公开(公告)日：2014-10-14
申请号：US13591421
申请日：2012-08-22
Applicant: Ke-Horng Chen , Wei-Quan Wu , Hsin-Hsin Ho
Inventor： Ke-Horng Chen , Wei-Quan Wu , Hsin-Hsin Ho
CPC classification number: H02M3/1582
Abstract: A buck-boost power converter switches the switches thereof with a novel sequence and extends the switching periods of the switches to reduce the switching loss and conduction loss when the input voltage thereof approaches the output voltage thereof. The influence of the load current of the power converter on the duty thereof is taken into account to switch the power converter between modes at correct time points, so as to prevent the output voltage from being affected by the mode switching.
Abstract translation: 降压 - 升压功率转换器以新颖的顺序切换其开关，并延长开关的开关周期，以在其输入电压接近其输出电压时降低开关损耗和导通损耗。 考虑到功率转换器的负载电流对其占空比的影响，以在正确的时间点在模式之间切换功率转换器，以防止输出电压受模式切换的影响。
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