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31.发明申请公开(公告)号：US20170196055A1
公开(公告)日：2017-07-06
申请号：US15216890
申请日：2016-07-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Tong-Cheng Jao , Isaac Y. Chen , Yi-Wei Lee , Wei-Ming Chiu , Jiun-Hung Pan
CPC classification number: H05B33/0815 , H05B33/0809 , H05B33/0812 , H05B33/0827 , H05B33/0848 , H05B33/0851
Abstract: A light emitting device circuit has one or plural light emitting devices connected in series. A light emitting device driver circuit drives the light emitting device circuit according to a rectified input voltage. The light emitting device driver circuit includes a power switch and a control circuit. When the power switch is conductive, a light emitting device current flows through the light emitting device circuit and the power switch. When the power switch is not conductive, an output capacitor discharges to provide the light emitting device current. The control circuit determines whether the rectified input voltage is lower or not lower than a forward voltage plus a reference voltage according to a voltage at a reverse end of the light emitting device circuit, and control the power switch accordingly.
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公开(公告)号：US20160327969A1
公开(公告)日：2016-11-10
申请号：US15201476
申请日：2016-07-03
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: A mixed mode compensation circuit for a power converter generate a digital signal according to a reference signal and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit.
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33.发明授权公开(公告)号：US09173264B2
公开(公告)日：2015-10-27
申请号：US13926538
申请日：2013-06-25
Applicant: Richtek Technology Corporation
Inventor： Jiun-Hung Pan , Chien-Fu Tang , Isaac Y. Chen , Tsung-Hsi Yang
IPC: H05B33/08
CPC classification number: H05B33/0815 , H05B33/0827
Abstract: An LED control device for configuring a phase-cut dimming system includes an LED and a switch. The LED control device configures the conduction status of the switch so as to supply power to the LED according to an input signal. The LED control device further detects whether the input signal is phase-cut. When the input signal is phase-cut, the LED control device stores the signal values of the internal circuits. Afterward, when the input signal is not phase-cut, the LED control device restores the stored signal values so that the internal circuits may resume to the previous operation status rapidly.
Abstract translation: 用于配置相位调光系统的LED控制装置包括LED和开关。 LED控制装置配置开关的导通状态，以根据输入信号向LED供电。 LED控制装置还检测输入信号是否被切断。 当输入信号为相位切断时，LED控制装置存储内部电路的信号值。 之后，当输入信号不是相位切断时，LED控制装置恢复存储的信号值，使得内部电路可以快速恢复到先前的操作状态。
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34.发明授权Circuit and method for improving noise immunity of a single-end level shifter in a floating gate driver 有权用于提高浮动栅极驱动器中单端电平移位器的抗噪声性的电路和方法公开(公告)号：US08779806B2
公开(公告)日：2014-07-15
申请号：US13761825
申请日：2013-02-07
Applicant: Richtek Technology Corporation
Inventor： Pei-Kai Tseng , Chien-Fu Tang , Isaac Y. Chen
CPC classification number: H03K3/013 , H03K19/00361 , H03K19/018507 , H03L5/00
Abstract: A floating gate driver uses a single-end level shifter to translate a set signal and a reset signal induced by a rising edge and a falling edge of a switch signal to a common output terminal to generate an output voltage for a bistable circuit to generate a level shifted switch signal. Under control of a well transient detect signal asserted by detecting noise in the output voltage, a masking circuit between the single-end level shifter and the bistable circuit masks noise in the output voltage. This configuration has lower area penalty and better noise immunity.
Abstract translation: 浮动栅极驱动器使用单端电平移位器将设置信号和由开关信号的上升沿和下降沿引起的复位信号转换为公共输出端，以产生双稳态电路的输出电压，以产生 电平转换开关信号。 在通过检测输出电压中的噪声所确定的良好瞬态检测信号的控制下，单端电平转换器和双稳态电路之间的屏蔽电路屏蔽输出电压中的噪声。 该配置具有较低的面积损失和更好的抗噪声能力。
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公开(公告)号：US20210119625A1
公开(公告)日：2021-04-22
申请号：US16984016
申请日：2020-08-03
Applicant: Richtek Technology Corporation
Inventor： Yu-Wen Chang , Leng-Nien Hsiu , Isaac Y. Chen
Abstract: An output stage circuit for transmitting data via a bus includes a high side switch, a high side diode structure, a high side clamp circuit, a low side switch, and a low side diode structure. An impedance circuit of the bus is coupled between the high side switch and the low side switch, for generating a differential output signal according to high and low side output signals. A high side N-type region of the high side diode structure encompasses a high side P-type region thereof, and a low side N-type region of the low side diode structure encompasses a low side P-type region thereof. The high side clamp circuit is connected to the high side N-type region in series, for clamping a voltage of the high side N-type region to be not lower than a predetermined voltage, to prevent a parasitic PNP bipolar junction transistor from being turned ON.
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Patent Agency Ranking
公开(公告)号：US10972090B1
公开(公告)日：2021-04-06
申请号：US16984016
申请日：2020-08-03
Applicant: Richtek Technology Corporation
Inventor： Yu-Wen Chang , Leng-Nien Hsiu , Isaac Y. Chen
Abstract: An output stage circuit for transmitting data via a bus includes a high side switch, a high side diode structure, a high side clamp circuit, a low side switch, and a low side diode structure. An impedance circuit of the bus is coupled between the high side switch and the low side switch, for generating a differential output signal according to high and low side output signals. A high side N-type region of the high side diode structure encompasses a high side P-type region thereof, and a low side N-type region of the low side diode structure encompasses a low side P-type region thereof. The high side clamp circuit is connected to the high side N-type region in series, for clamping a voltage of the high side N-type region to be not lower than a predetermined voltage, to prevent a parasitic PNP bipolar junction transistor from being turned ON.
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37.发明授权公开(公告)号：US10686383B2
公开(公告)日：2020-06-16
申请号：US16541293
申请日：2019-08-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Li-Di Lo , Chien-Fu Tang , Isaac Y. Chen
Abstract: Whether a synchronous signal includes a synchronous pulse is determined by detecting whether there is a positive pulse higher than a positive threshold followed by a negative pulse lower than a negative threshold. The pulse signal detection method includes: comparing the synchronous signal with the positive threshold; comparing the synchronous signal with the negative threshold; and determining that the synchronous pulse exists when the positive pulse of the synchronous signal is higher than the positive threshold and the negative pulse of the synchronous signal is lower than the negative threshold in a post detection period after the positive pulse of the synchronous signal is determined higher than the positive threshold.
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公开(公告)号：US10587312B1
公开(公告)日：2020-03-10
申请号：US16532531
申请日：2019-08-06
Applicant: Richtek Technology Corporation
Inventor： Tong-Cheng Jao , Yi-Wei Lee , Isaac Y. Chen
Abstract: A transmission interface with noise reduction function includes a first circuit and a second circuit, for transmitting a signal from the first circuit to the second circuit or from the second circuit to the first circuit. The first circuit includes a first sub-winding and a first wire unit, and the second circuit includes a second sub-winding and a second wire unit. When an electromagnetic noise passes through the first sub-winding and the first wire unit, two loop currents are respectively generated, and the currents have opposite directions to cancel each other so as to reduce the electromagnetic noise. Or, when an emitting current corresponding to the signal flows through the first sub-winding and the first wire unit, two magnetic fields are respectively generated, and the magnetic fields have opposite directions to cancel each other so as to reduce the electromagnetic interference.
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39.发明申请公开(公告)号：US20190058391A1
公开(公告)日：2019-02-21
申请号：US16167451
申请日：2018-10-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yi-Min Shiu , Isaac Y. Chen
Abstract: The present invention discloses a short circuit and/or bad connection detection method for use in a power supply system. The power supply system includes a power converter which converts an input voltage to an output voltage and supplies an output current to an electronic device. In the short circuit detection method, the conversion from the input voltage to the output voltage is disabled in a disable time period, and whether a short circuit occurs is determined according to the decreasing speed of the output voltage. In the bad connection detection method, an actual voltage and an actual current received by the electronic device are compared with the output voltage and the output current, to determine whether a bad connection occurs.
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公开(公告)号：US10177558B1
公开(公告)日：2019-01-08
申请号：US15909313
申请日：2018-03-01
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jyun-Che Ho , Jo-Yu Wang , Isaac Y. Chen
Abstract: A buck switching regulator includes: a power stage, which includes: an upper-gate switch, a lower-gate switch and an inductor, connected with one another at a switching node; and a supply control switch, controlling the power supply form an output terminal to a load. An overvoltage protection method includes the following steps: (A) sensing a voltage of the switching node, to obtain a switching node voltage; (B) determining whether an overvoltage event occurs in the switching node voltage; and (C) if it is determined yes in the step (B), outputting a protection signal. An overvoltage event is determined directly according to the switching node voltage, not directly according to the output voltage.
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