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公开(公告)号：US20210305888A1
公开(公告)日：2021-09-30
申请号：US17106756
申请日：2020-11-30
Applicant: Leadtrend Technology Corporation
Inventor： Yao-Tsung CHEN , Kuan-Hsien CHOU
Abstract: A power controller for an LLC resonant converter controls a high-side switch and a low-side switch. An ON-time generator in the power controller determines a high-side ON time of the high-side switch and a low-side ON time of the low-side switch in response to the bigger one between a feedback voltage and a burst voltage, where the feedback voltage is generated in response to an output voltage of the LLC resonant converter. A burst-mode controller in the power controller has a triangular-wave generator providing a triangular-wave signal with an amplitude in association with the burst voltage. A comparator comparing the triangular-wave signal and the feedback voltage to determine a break time when both the high-side and low-side switches are turned OFF. The LLC resonant converter operates in a burst mode when the break time is introduced.
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公开(公告)号：US20210099093A1
公开(公告)日：2021-04-01
申请号：US17012242
申请日：2020-09-04
Applicant: Leadtrend Technology Corporation
Inventor： Chung-Wei LIN , Hung Ching LEE , Tsung Chien WU , Bo-Yi WU
Abstract: A power supply has a transformer, a rectifier switch, a secondary-side controller and two diodes. The transformer includes a primary winding, a secondary winding, and a detection winding, inductively coupling to one another. The rectifier switch is connected in series with the secondary winding between two output power lines. The secondary-side controller is electrically coupled to two ends of the detection winding, for controlling the rectifier switch in response to two terminal signals at the two ends respectively. The two diodes are back-to-back electrically connected in series between the two ends, and a joint connecting the two diodes is electrically connected to one of the two output power lines.
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公开(公告)号：US10965210B2
公开(公告)日：2021-03-30
申请号：US16725621
申请日：2019-12-23
Applicant: Leadtrend Technology Corporation
Inventor： Yao-Tsung Chen , Kuan-Hsien Chou
Abstract: A power controller for use in a PFC power converter is capable being immune from audible noise during the test of load transient response. A transconductor with a transconductance compares an output voltage of the PFC power converter with a target voltage to provide a compensation current, which builds up a compensation voltage. An ON-time controller is configured to end an ON time of a power switch in response to the compensation voltage. An OFF-time controller is configured to end an OFF time of the power switch. A compensation-voltage designator presets the compensation voltage. A status detector controls the transconductor, the ON-time controller, the OFF-time controller, and the compensation-voltage designator, in response to the output voltage, a top-boundary voltage and a bottom-boundary voltage.
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74.发明授权公开(公告)号：US10667356B2
公开(公告)日：2020-05-26
申请号：US16507778
申请日：2019-07-10
Applicant: Leadtrend Technology Corporation
Inventor： Chun Hsin Li , Wei Cheng Su , Ruei Jhih Jheng
Abstract: A dimming controller is capable of receiving a dimming signal to dim light-emitting device no matter the dimming signal is of DC or of PWM. A type identifier identifies whether the dimming signal received from an input node is of DC or of PWM. A multiplexer with an output is controlled by the type identifier and configured to provide at least a DC signal path and a PWM signal path both coupled between the input node and the output. The type identifier makes the multiplexer enable the DC signal path and interrupt the PWM signal path if the dimming signal is identified as of DC, and makes the multiplexer enable the PWM signal path and interrupt the DC signal path if the dimming signal is identified as of PWM.
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75.发明授权公开(公告)号：US10397997B2
公开(公告)日：2019-08-27
申请号：US16199367
申请日：2018-11-26
Applicant: Leadtrend Technology Corporation
Inventor： Chun Hsin Li , Wei Cheng Su , Hung Ching Lee , Chung-Wei Lin
Abstract: A dimming controller is capable of receiving a dimming signal to dim light-emitting device no matter the dimming signal is of a first type or of a second type. A type identifier identifies whether the dimming signal received from an input node is of the first type or of the second type, to accordingly generate a selection signal. A signal converter generates a first signal in response to the dimming signal, and the first signal is of the first type. A multiplexer has two inputs receiving the first signal and the dimming signal respectively, and, in response to the selection signal, forwards one of the first signal and the dimming signal to a driver driving the light-emitting device.
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Patent Agency Ranking
公开(公告)号：US10347756B2
公开(公告)日：2019-07-09
申请号：US15854913
申请日：2017-12-27
Applicant: Leadtrend Technology Corporation
Inventor： Kuo-Chin Chiu , Cheng-Sheng Kao
IPC: H01L29/78 , H01L27/06 , H01L27/07 , H01L29/66 , H01L21/82 , H01L21/33 , H01L29/10 , H02M1/08 , H02M7/217 , H01L29/40 , H01L29/423
Abstract: An embodiment of the invention shows a high-voltage MOS field-effect transistor connected in series with a Schottky diode. When the Schottky diode is forwardly biased, the high-voltage MOSFET can act as a switch and sustain a high drain-to-source voltage. When the Schottky diode is reversely biased, the Schottky diode can protect the integrate circuit where the high-voltage MOSFET is formed, because the integrate circuit might otherwise burn out due to an exceedingly-large reverse current.
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公开(公告)号：US10230297B2
公开(公告)日：2019-03-12
申请号：US16028451
申请日：2018-07-06
Applicant: Leadtrend Technology Corporation
Inventor： Kuo-Chin Chiu
Abstract: A high-voltage startup circuit in an integrated circuit with a high-voltage pin and an operating voltage pin is disclosed, capable of having both low standby power consumption and high-speed transient response. An ultra-high voltage transistor and a main NMOS transistor are connected in series via a joint node between the high-voltage pin and the operating voltage pin. A pull-up circuit controlled by a stop signal is connected between the joint node and a first gate of the main NMOS transistor. A pull-down circuit controlled by the stop signal is connected to the first gate of the main NMOS transistor. When the stop signal is de-asserted the pull-up circuit couples the joint node to the first gate. When the stop signal is asserted the pull-up circuit performs an open circuit and the pull-down circuit pulls down the first gate voltage.
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公开(公告)号：US09800135B2
公开(公告)日：2017-10-24
申请号：US15255193
申请日：2016-09-02
Applicant: Leadtrend Technology Corporation
Inventor： Ching-Tsan Lee , Wei-Wen Ou , Chien-Chun Lu
CPC classification number: H02M1/15 , G05F1/00 , G05F1/461 , H02M1/08 , H02M3/155 , H02M3/157 , H02M2001/0009
Abstract: A ripple suppressor suppresses ripples of a channel current. The ripple suppressor comprises a voltage-controlled current source, a stabilizer, and an auto-calibration circuit. A control voltage at a control node controls the channel current flowing through a path connecting first and second channel nodes. The voltage-controlled current source receives a current-setting signal to generate the control voltage, so as to stabilize the channel current in response to the current-setting signal. The stabilizer at least provides low-pass filtering to generate and stabilize the current-setting signal in response to a first channel voltage at the first channel node. The auto-calibration circuit controls the stabilizer in response to the control voltage, so as to make the control voltage in compliance with a first predetermined condition.
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公开(公告)号：US09774267B2
公开(公告)日：2017-09-26
申请号：US15174169
申请日：2016-06-06
Applicant: Leadtrend Technology Corporation
Inventor： Ching-Tsan Lee , Mao-Shih Li , Hsin Hung Lu , San Yi Li
IPC: H02M3/335
CPC classification number: H02M3/33523 , H02M3/33515
Abstract: A control circuit suitable for a power supply. The power supply has a transformer with a primary winding and a secondary winding magnetically coupled to each other. The transformer is configured to transfer electric energy from a primary side to a secondary side and to build an output power source in the secondary side. The control circuit has a primary-side controller and a secondary-side controller. The primary-side controller is in the primary side, configured to control a current through the primary winding. In the secondary side, the secondary-side controller is powered by the output power source and configured to provide a command code with several command bits sequentially transmitted to the primary-side controller, so as to set an operation mode that the primary-side controller operates in.
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公开(公告)号：US09337739B2
公开(公告)日：2016-05-10
申请号：US14077479
申请日：2013-11-12
Applicant: Leadtrend Technology Corporation
Inventor： Ming Chang Tsou , Meng Jen Tsai
CPC classification number: H02M3/33507 , H02M1/32
Abstract: A power controller with over power protection is disclosed, capable of providing a pulse-width-modulation signal to control a power switch. The power controller comprises a pulse width modulator, first and second oscillators, and an over power detector. The pulse width modulator generates the pulse-width-modulation signal. The first oscillator is coupled to the pulse width modulator, for determining a cycle time of the pulse-width-modulation signal. The second oscillator, independent from the first oscillator, determines a maximum over power duration. The over power detector detects the occurrence of an over power event. When the over power event lasts for the maximum over power duration, the pulse-width-modulation signal switches OFF the power switch constantly.
Abstract translation: 公开了具有过功率保护的功率控制器，能够提供脉宽调制信号来控制电源开关。 功率控制器包括脉宽调制器，第一和第二振荡器以及过功率检测器。 脉宽调制器产生脉宽调制信号。 第一振荡器耦合到脉宽调制器，用于确定脉宽调制信号的周期时间。 独立于第一个振荡器的第二个振荡器决定了最大过功率持续时间。 过功率检测器检测过功率事件的发生。 当过功率事件持续最大过功率持续时间时，脉宽调制信号不断关断电源开关。
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