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公开(公告)号：US09629214B2
公开(公告)日：2017-04-18
申请号：US14718045
申请日：2015-05-20
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chiawei Liao , Jing-Meng Liu
CPC classification number: H05B33/0845 , G09G3/3406 , G09G2330/04 , H05B33/0812 , H05B33/0827 , H05B33/089 , Y02B20/345
Abstract: The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.
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公开(公告)号：US20170257920A1
公开(公告)日：2017-09-07
申请号：US15600764
申请日：2017-05-21
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jing-Meng Liu
IPC: H05B33/08
CPC classification number: H05B33/0827
Abstract: Alight emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.
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3.发明授权公开(公告)号：US09179517B2
公开(公告)日：2015-11-03
申请号：US13966075
申请日：2013-08-13
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chiawei Liao , Jing-Meng Liu
IPC: H05B37/02 , H05B33/08 , G02F1/1335
CPC classification number: H05B33/089 , G02F1/133603 , G02F2001/133612
Abstract: The present invention discloses a backlight control circuit, comprising: a voltage supply circuit for receiving an input voltage and generating an output voltage under control by a control signal; at least one voltage comparison path respectively coupled to at least one light emission device path; a voltage operative amplifier circuit for generating the control signal according to a lowest voltage on the at least one voltage comparison path; and at least one under current detection circuit for detecting whether a corresponding one of the at least one light emission device path is in an under current status, whereby when anyone of the under current detection circuits detects the under current status, it sends an exclusion signal excluding a corresponding one of the at least one voltage comparison path from being an effective input of the voltage operative amplifier.
Abstract translation: 本发明公开了一种背光控制电路，包括：电压供给电路，用于接收输入电压，并通过控制信号控制输出电压; 至少一个电压比较路径分别耦合到至少一个发光器件路径; 电压操作放大器电路，用于根据所述至少一个电压比较路径上的最低电压产生所述控制信号; 以及至少一个欠电流检测电路，用于检测所述至少一个发光器件路径中的相应一个是否处于低电流状态，由此当所述欠电流检测电路中的任何一个检测到所述欠电流状态时，发送排除信号 不包括所述至少一个电压比较路径中的相应一个电压作为所述电压运算放大器的有效输入。
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公开(公告)号：US20190190278A1
公开(公告)日：2019-06-20
申请号：US16133818
申请日：2018-09-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Jing-Meng Liu , Ta-Yung Yang
IPC: H02J7/00
CPC classification number: H02J7/007
Abstract: A charger circuit converts a supply voltage of a DC power supply to a charging voltage and a charging current to charge a battery. A battery charging method includes: setting the supply voltage to an initial voltage; checking whether the charging voltage reaches a predetermined voltage level; when the charging voltage is lower than the predetermined voltage level, delivering a control signal to the DC power supply to reduce the supply voltage; when the charging voltage or the charging current is reduced accordingly, delivering the control signal to the DC power to increase the supply voltage; and repetitively reducing and/or increasing the supply voltage until the charging voltage reaches the predetermined voltage level.
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Patent Agency Ranking
公开(公告)号：US10187941B2
公开(公告)日：2019-01-22
申请号：US15600764
申请日：2017-05-21
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jing-Meng Liu
IPC: H05B33/08
Abstract: A light emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.
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公开(公告)号：US10170923B2
公开(公告)日：2019-01-01
申请号：US15951759
申请日：2018-04-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Jing-Meng Liu , Isaac Y. Chen , Tzu-Chen Lin
Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by a mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current; a monitor circuit arranged to operably detect the DC voltage or the cable current; and a data processing circuit configured for controlling the power converting circuit according to the communication signal. The data processing circuit further communicates with the mobile device through the terminal communication interface and the connection terminal in response to a detection result of the monitor circuit.
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公开(公告)号：US20160134135A1
公开(公告)日：2016-05-12
申请号：US14933266
申请日：2015-11-05
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jing-Meng Liu , Li-Wei Lee
IPC: H02J7/00
Abstract: The present invention discloses a high efficiency charging system and a charging circuit therein. The high efficiency charging system includes a power supplier and a power receiver, which are connected via a transmission wire so that power is transmitted from the power supplier to the power receiver. The power receiver includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an adjustable input voltage provided by the power supplier to an output voltage and generates an output current for charging a battery. The voltage conversion circuit adaptively adjusts the output current according to a voltage drop between the adjustable input voltage and the output voltage. The control circuit senses the adjustable input voltage and the output voltage and instructs the power supplier to adjust the output voltage according to the voltage drop between the adjustable input voltage and output voltage.
Abstract translation: 本发明公开了一种高效率充电系统和充电电路。 高效率充电系统包括通过传输线连接的电力供应商和电力接收器，使得电力从电力供应商传送到电力接收器。 电力接收器包括电压转换电路和控制电路。 电压转换电路将由电源提供的可调输入电压转换为输出电压，并产生用于对电池充电的输出电流。 电压转换电路根据可调输入电压和输出电压之间的电压降自适应调节输出电流。 控制电路检测可调输入电压和输出电压，并指示电源根据可调输入电压和输出电压之间的电压降调节输出电压。
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公开(公告)号：US09979214B2
公开(公告)日：2018-05-22
申请号：US15013459
申请日：2016-02-02
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Jing-Meng Liu , Isaac Y. Chen , Tzu-Chen Lin
CPC classification number: H02J7/0044 , G06F1/266 , H02J7/0042 , H02J7/0052 , H02J7/0055 , H02J7/007 , H02J7/0072 , H02J2007/0059 , H02J2007/0062
Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by the mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the DC voltage while the charging current is greater than the cable current; and a data processing circuit coupled with the power converting circuit and configured for controlling the power converting circuit according to the communication signal.
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公开(公告)号：US09800078B2
公开(公告)日：2017-10-24
申请号：US14933266
申请日：2015-11-05
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jing-Meng Liu , Li-Wei Lee , Ta-Yung Yang
IPC: H02J7/00
Abstract: The present invention discloses a high efficiency charging system and a charging circuit therein. The high efficiency charging system includes a power supplier and a power receiver, which are connected via a transmission wire so that power is transmitted from the power supplier to the power receiver. The power receiver includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an adjustable input voltage provided by the power supplier to an output voltage and generates an output current for charging a battery. The voltage conversion circuit adaptively adjusts the output current according to a voltage drop between the adjustable input voltage and the output voltage. The control circuit senses the adjustable input voltage and the output voltage and instructs the power supplier to adjust the output voltage according to the voltage drop between the adjustable input voltage and output voltage.
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