公开(公告)号：US20140211511A1

公开(公告)日：2014-07-31

申请号：US14164238

申请日：2014-01-26

Applicant: Leadtrend Technology Corp.

Inventor： Meng-Jen Tsai ,  Chih-Chi Chang ,  Ming-Chang Tsou

IPC: H02M3/24

CPC classification number: H02M3/33523 ,  H02H7/1227 ,  H02M1/32 ,  H02M2001/0009 ,  H02M2001/0019

Abstract: A device for detecting an average output current of a power converter includes a current generation unit, a first voltage generation unit, a first current mirror unit, and a second current mirror unit. The current generation unit generates a first charge current according to an intermediate voltage. The first voltage generation unit generates a first node voltage according to the first charge current, a first discharge current, a turning-on time, and an inverse turning-on time. The first current mirror unit generates a first current according to the first node voltage, and generates a second voltage corresponding to the average output current of a secondary side of the power converter according to the first current. The second current mirror unit generates the first discharge current according to the first current.

Abstract translation: 用于检测功率转换器的平均输出电流的装置包括电流产生单元，第一电压产生单元，第一电流镜单元和第二电流镜单元。 电流产生单元根据中间电压产生第一充电电流。 第一电压产生单元根据第一充电电流，第一放电电流，接通时间和反向接通时间产生第一节点电压。 第一电流镜单元根据第一节点电压产生第一电流，并且根据第一电流产生与功率转换器的次级侧的平均输出电流相对应的第二电压。 第二电流镜单元根据第一电流产生第一放电电流。

公开(公告)号：US20140098570A1

公开(公告)日：2014-04-10

申请号：US14045788

申请日：2013-10-03

Applicant: Leadtrend Technology Corp.

Inventor： Meng-Jen Tsai ,  Ming-Chang Tsou

IPC: H02M3/24

CPC classification number: H02M3/24 ,  H02M3/33507 ,  H02M2001/0019

Abstract: A controller for controlling a power converter to output constant power includes a current sensing module, a voltage generation module, and a voltage regulation module. The current sensing module generates a sensing current according to an output current flowing through a secondary side of the power converter. The voltage generation module generates a set voltage corresponding to a reciprocal of the sensing current according to the sensing current. The voltage regulation module generates a regulation voltage to a feedback circuit of the secondary side of the power converter according to the set voltage and a sensing voltage corresponding to an output voltage of the secondary side of the power converter. The feedback circuit and a primary side of the power converter regulate the output voltage according to the regulation voltage, where a product of the output voltage and the output current is a constant value.

Abstract translation: 用于控制功率转换器输出恒定功率的控制器包括电流感测模块，电压产生模块和电压调节模块。 电流感测模块根据流过功率转换器的次级侧的输出电流产生感测电流。 电压产生模块根据感测电流产生对应于感测电流的倒数的设定电压。 电压调节模块根据设定的电压和对应于功率转换器的次级侧的输出电压的感测电压，向功率转换器的次级侧的反馈电路产生调节电压。 功率转换器的反馈电路和初级侧根据调节电压来调节输出电压，其中输出电压和输出电流的乘积是恒定值。

公开(公告)号：US09755421B2

公开(公告)日：2017-09-05

申请号：US14599554

申请日：2015-01-19

Applicant: Leadtrend Technology Corp.

Inventor： Chih-Chi Chang ,  Da-Chun Wei ,  Ming-Chang Tsou ,  Meng-Jen Tsai

IPC: H02H7/10 ,  H02H3/20 ,  H02H5/04 ,  H02H7/12

CPC classification number: H02H5/042 ,  H02H3/20 ,  H02H7/1213

Abstract: A control circuit applied to a power converter includes a multi-functional pin, a zero-crossing signal generator, and an over-voltage detector. The multi-functional pin is used for receiving an auxiliary current generated by an auxiliary winding of the power converter, and an input current. The zero-crossing signal generator is used for generating a zero-crossing signal according to the auxiliary current. The over-voltage detector is used for generating an over-voltage signal according to the auxiliary current. The control circuit generates a switch control signal to the power switch according to the zero-crossing signal, or generates an over-voltage protection signal to the power switch according to the over-voltage signal.

公开(公告)号：US20160226371A1

公开(公告)日：2016-08-04

申请号：US15011678

申请日：2016-02-01

Applicant: Leadtrend Technology Corp.

Inventor： Ming-Chang Tsou ,  Meng-Jen Tsai ,  Yu-Kun Lin

IPC: H02M1/32 ,  H02M7/06

CPC classification number: H02M1/32 ,  H02H7/16 ,  H02J7/345 ,  H02M7/06 ,  H02M2001/322

Abstract: A protection circuit applied to an alternating current (AC) power source includes a sample-and-hold unit, a detection unit, and a discharge signal generation unit. The sample-and-hold unit samples a peak value of a direct current (DC) voltage during each period of a corresponding AC voltage, wherein the AC power source provides the AC voltage. The detection unit generates a detection signal when the DC voltage crosses a reference voltage corresponding to the peak value. The discharge signal generation unit generates a count signal when the discharge signal generation unit does not receive the detection signal within a predetermined time of a period of the AC voltage, accumulates the count signal, and generates a discharge signal to a discharge unit when a number of accumulated count signals is greater than a predetermined value, wherein the discharge unit discharges an X capacitor according to the discharge signal.

Abstract translation: 施加到交流（AC）电源的保护电路包括采样保持单元，检测单元和放电信号生成单元。 采样和保持单元在对应AC电压的每个周期期间对直流（DC）电压的峰值进行采样，其中AC电源提供AC电压。 当直流电压跨越与峰值相对应的参考电压时，检测单元产生检测信号。 当放电信号生成单元在AC电压的周期的预定时间内没有接收到检测信号时，放电信号生成单元生成计数信号，累积计数信号，并且当数字 累积计数信号大于预定值，其中放电单元根据放电信号放电X电容器。

公开(公告)号：US20230396177A1

公开(公告)日：2023-12-07

申请号：US18234885

申请日：2023-08-17

Applicant: Leadtrend Technology Corp.

Inventor： Chih-Chi Chang ,  Meng-Jen Tsai ,  Yao-Tsung Chen ,  Ming-Chang Tsou

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/38 ,  H02M3/00

CPC classification number: H02M3/33571 ,  H02M1/0058 ,  H02M1/0016 ,  H02M3/01 ,  H02M1/38

Abstract: A controller applied to a primary side of an inductor-inductor-capacitor (LLC) resonant converter includes a common-mode voltage generation circuit and a control signal generation circuit. The common-mode voltage generation circuit is used for generating a common-mode voltage. The control signal generation circuit is used for generating an upper bridge switch control signal and a lower bridge switch control signal according to a compensation voltage corresponding to an output voltage of the LLC resonant converter, a sensing voltage corresponding to an input voltage of the LLC resonant converter, and the common-mode voltage, wherein the upper bridge switch control signal and the lower bridge switch control signal control an upper bridge switch and a lower bridge switch of the primary side of the LLC resonant converter, respectively.

公开(公告)号：US09843264B2

公开(公告)日：2017-12-12

申请号：US15058167

申请日：2016-03-02

Applicant: Leadtrend Technology Corp.

Inventor： Ming-Chang Tsou ,  Meng-Jen Tsai

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/32

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/0009 ,  H02M2001/0048 ,  Y02B70/1491

Abstract: A controller of a power converter includes a sample-and-hold unit and an adjustment unit, wherein the power converter is applied to a Universal Serial Bus power delivery adapter system. The sample-and-hold unit is used for sampling a voltage to generate a sampling voltage during each period of a gate control signal, wherein the sampling voltage corresponds to an output voltage of the power converter. The adjustment unit is coupled to the sample-and-hold unit for adjusting at least one of a frequency of the gate control signal, a current flowing through a primary side of the power converter, and a resistance of a compensation resistor of the controller according to the sampling voltage.

公开(公告)号：US09641086B2

公开(公告)日：2017-05-02

申请号：US14824100

申请日：2015-08-12

Applicant: Leadtrend Technology Corp.

Inventor： Ming-Chang Tsou ,  Meng-Jen Tsai ,  Chih-Chi Chang

IPC: H02M3/33 ,  H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M2001/0025 ,  H02M2001/0048 ,  Y02B70/1491

Abstract: An oscillator applied to a control circuit of a power converter includes a compensation module and an oscillation module. The compensation module outputs or sinks an adjustment current according to a compensation voltage corresponding to a load, a direct current voltage of a primary side of the power converter, and a reference voltage. The oscillation module outputs a clock signal according to the compensation voltage, a control voltage, and the adjustment current. The control circuit generates a gate control signal to a power switch of the primary side according to the clock signal. When the compensation voltage is less than a first predetermined voltage, a frequency of the gate control signal is a first fixed value, and when the compensation voltage is between the first predetermined voltage and a second predetermined voltage and greater than the second predetermined voltage, the frequency is varied with the compensation voltage.

公开(公告)号：US09584030B2

公开(公告)日：2017-02-28

申请号：US14732801

申请日：2015-06-08

Applicant: Leadtrend Technology Corp.

Inventor： Ming-Chang Tsou ,  Meng-Jen Tsai

IPC: H02M3/335 ,  H02M1/44 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M1/44 ,  H02M2001/0035 ,  Y02B70/16

Abstract: A controller for eliminating acoustic noise of a power converter includes a control unit and a gate signal generation unit. The control unit is used for detecting a frequency corresponding to a gate control signal in a burst mode of the power converter. When the frequency is greater than a predetermined frequency, the control unit increases a resistance of a compensation resistor coupled to a compensation pin of the power converter; and when the frequency is less than the predetermined frequency, the control unit decreases the resistance of the compensation resistor. The gate signal generation unit is coupled to the control unit for generating the gate control signal to a power switch of a primary side of the power converter according to the resistance of the compensation resistor. The power switch is turned on according to the gate control signal.

Abstract translation: 用于消除功率转换器的声学噪声的控制器包括控制单元和门信号产生单元。 控制单元用于检测与功率转换器的突发模式中的门控制信号相对应的频率。 当频率大于预定频率时，控制单元增加耦合到功率转换器的补偿引脚的补偿电阻的电阻; 并且当频率小于预定频率时，控制单元降低补偿电阻器的电阻。 栅极信号生成单元耦合到控制单元，用于根据补偿电阻器的电阻将功率转换器的初级侧的功率开关产生栅极控制信号。 电源开关根据门控信号接通。

公开(公告)号：US09160233B2

公开(公告)日：2015-10-13

申请号：US14045788

申请日：2013-10-03

Applicant: Leadtrend Technology Corp.

Inventor： Meng-Jen Tsai ,  Ming-Chang Tsou

IPC: H02M3/335 ,  H02M3/24 ,  H02M1/00

CPC classification number: H02M3/24 ,  H02M3/33507 ,  H02M2001/0019

Abstract: A controller for controlling a power converter to output constant power includes a current sensing module, a voltage generation module, and a voltage regulation module. The current sensing module generates a sensing current according to an output current flowing through a secondary side of the power converter. The voltage generation module generates a set voltage corresponding to a reciprocal of the sensing current according to the sensing current. The voltage regulation module generates a regulation voltage to a feedback circuit of the secondary side of the power converter according to the set voltage and a sensing voltage corresponding to an output voltage of the secondary side of the power converter. The feedback circuit and a primary side of the power converter regulate the output voltage according to the regulation voltage, where a product of the output voltage and the output current is a constant value.

Abstract translation: 用于控制功率转换器输出恒定功率的控制器包括电流感测模块，电压产生模块和电压调节模块。 电流感测模块根据流过功率转换器的次级侧的输出电流产生感测电流。 电压产生模块根据感测电流产生对应于感测电流的倒数的设定电压。 电压调节模块根据设定的电压和对应于功率转换器的次级侧的输出电压的感测电压，向功率转换器的次级侧的反馈电路产生调节电压。 功率转换器的反馈电路和初级侧根据调节电压来调节输出电压，其中输出电压和输出电流的乘积是恒定值。

公开(公告)号：US20240063706A1

公开(公告)日：2024-02-22

申请号：US17983406

申请日：2022-11-09

Applicant: Leadtrend Technology Corp.

Inventor： Ming-Chang Tsou ,  Chao-Chih Lin ,  Meng-Jen Tsai

IPC: H02M1/00 ,  H02M3/335

CPC classification number: H02M1/0025 ,  H02M1/0058 ,  H02M3/33507

Abstract: A controller applied to a power converter is installed in a primary side of the power converter. The controller includes a capacitor, an adjustment signal generation circuit, and a discharge circuit. The capacitor is used for generating a tracking voltage. The adjustment signal generation circuit is used for generating an adjustment signal according to a feedback voltage and the tracking voltage. The discharge circuit is used for discharging the capacitor according to the feedback voltage and the adjustment signal. The tracking voltage is used for tracking a state of a magnetizing current of a magnetizing inductor of the primary side of the power converter, and when the tracking voltage consists with the state of the magnetizing current, the tracking voltage is applied to at least one of zero-voltage switching (ZVS) control and quasi-resonant (QR) control of the power converter.