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1. 发明申请

US20220352824A1 LLC CONVERTER CIRCUIT 有权
公开(公告)号：US20220352824A1
公开(公告)日：2022-11-03
申请号：US17406057
申请日：2021-08-18
申请人： Power Forest Technology Corporation
发明人： Chao-Chang Chiu , Chien-Wei Kuan
IPC分类号： H02M3/337 , H02M1/00 , H02M3/335
摘要： An LLC converter circuit is provided. A control circuit provides a first control signal and a second control signal according to a sensing voltage generated by sensing a voltage on a resonant capacitor of a primary side, so as to control a conduction state of a half-bridge switch circuit.

2. 发明授权

US11205967B2 Voltage conversion apparatus with feedback circuit including resistor network and voltage conversion method thereof 有权
公开(公告)号：US11205967B2
公开(公告)日：2021-12-21
申请号：US16790767
申请日：2020-02-14
申请人： Power Forest Technology Corporation
发明人： Wen-Sheng Wang , Chia-Hsien Liu
IPC分类号： H02M3/335 , H02M1/00
摘要： A voltage conversion apparatus and a voltage conversion method thereof are provided. A conversion circuit converts outputs of a plurality of secondary windings to generate a conversion voltage or a conversion current to a resistor network of a feedback circuit to thereby change impedance characteristics of the resistor network. The feedback circuit adjusts a feedback voltage in response to the change in the impedance characteristics of the resistor network, so that a control circuit controls an output of a transformer circuit according to the feedback voltage.

3. 发明申请

US20210003887A1 LIGHT EMITTING DIODE BACKLIGHT SYSTEM AND LIGHT EMITTING DIODE CONTROL CIRCUIT 有权
公开(公告)号：US20210003887A1
公开(公告)日：2021-01-07
申请号：US16558345
申请日：2019-09-03
申请人： Power Forest Technology Corporation
发明人： Chia-Hsien Liu
IPC分类号： G02F1/1335 , H05B33/08 , G09G3/34
摘要： An LED backlight system and an LED control circuit are provided. The LED backlight system includes an LED string and the LED control circuit. The LED control circuit includes an LED driver, a switching circuit and an abnormality detecting circuit. The LED driver is configured to generate a control signal. The switching circuit controls a current flowing through the LED string in response to the control signal. The abnormality detecting circuit is configured to detect a voltage or the current of a first end of the LED string. When the voltage or the current of the first end of the LED string is less than or equal to a threshold value, the abnormality detecting circuit turns off the switching circuit, and the abnormality detecting circuit detects an impedance of the first end of the LED string to determine an abnormal state of the LED string.

4. 发明申请

US20190013727A1 POWER CONVERSION APPARATUS AND SYNCHRONOUS RECTIFICATION CIRCUIT THEREOF 审中-公开
公开(公告)号：US20190013727A1
公开(公告)日：2019-01-10
申请号：US15694875
申请日：2017-09-04
申请人： Power Forest Technology Corporation
发明人： Po-Jen Ke
IPC分类号： H02M1/32 , H02M3/335 , H02M1/08
摘要： A power conversion apparatus and a synchronous rectification (SR) circuit thereof are provided. The power conversion apparatus includes a transformer and the SR circuit. A primary winding of the transformer receives an input voltage. A secondary winding of the transformer provides an output voltage to an output terminal. The SR circuit includes a SR transistor and a SR controller. The SR transistor is coupled between the secondary winding and the output terminal and controlled by a control signal. The SR controller is coupled to the SR transistor to receive a first detecting signal, and generates the control signal according to the first detecting signal. When the SR controller detects that the SR circuit is abnormal, the SR controller generates the controller signal to keep the SR transistor at an on state so as to perform an abnormal protection on the SR circuit.

5. 发明授权

US10079549B1 Synchronous rectification controller with pull-up and pull-down circuit and power conversion apparatus having the same 有权
公开(公告)号：US10079549B1
公开(公告)日：2018-09-18
申请号：US15663836
申请日：2017-07-31
申请人： Power Forest Technology Corporation
发明人： Kwan-Jen Chu
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , H02M1/08 , H02M2001/0009 , Y02B70/1475
摘要： A power conversion apparatus and a synchronous rectification (SR) controller thereof are provided. The SR controller includes a first control circuit, a second control circuit, a pull-up circuit and a pull-down circuit. The first control circuit generates a pull-up control signal and a first pull-down signal according to a drain voltage of an SR transistor and a first voltage. The second control circuit compares the drain voltage with a second voltage to generate a second pull-down signal, and selects one of the first pull-down signal and the second pull-down signal as a pull-down control signal. The pull-up circuit and the pull-down circuit regulate a driving voltage on a gate terminal of the SR transistor in response to the pull-up control signal and the pull-down control signal respectively.

6. 发明授权

US10056845B1 Power conversion apparatus and synchronous rectification controller thereof 有权
公开(公告)号：US10056845B1
公开(公告)日：2018-08-21
申请号：US15629726
申请日：2017-06-21
申请人： Power Forest Technology Corporation
发明人： Kwan-Jen Chu
IPC分类号： H02M3/335
CPC分类号： H02M3/33592 , Y02B70/1475
摘要： A power conversion apparatus and a synchronous rectification (SR) controller thereof are provided. The SR controller includes a first control circuit, a second control circuit and a third control circuit. The first control circuit compares a drain voltage on a drain terminal of a SR transistor with a first voltage. When the drain voltage is lower than the first voltage, the first control circuit outputs a driving voltage to turn on the SR transistor. The second control circuit generates the driving voltage according to the drain voltage and a second voltage so as to control the SR transistor. The third control circuit compares the drain voltage with a third voltage. When the drain voltage is higher than the third voltage, the third control circuit outputs the driving voltage to turn off the SR transistor.

7. 发明授权

US09369047B2 Power control methods for flyback converters based on the current limit and switching frequency 有权
标题翻译：基于电流限制和开关频率的反激式转换器的功率控制方法
公开(公告)号：US09369047B2
公开(公告)日：2016-06-14
申请号：US14078842
申请日：2013-11-13
申请人： DELTA ELECTRONICS, INC. , POWER FOREST TECHNOLOGY CORPORATION
发明人： Ren-Huei Tzeng , Kuan-Sheng Wang , Wei-Chan Hsu , Chien-Chung Chang , Geu-Cheng Hu , Cheng-Yi Lin
IPC分类号： H02M3/335
CPC分类号： H02M3/335 , H02M3/33507 , H02M3/33515 , H02M3/33523 , H02M3/33538 , H02M3/33546 , H02M3/33553
摘要： Methods for flyback converters are provided. The method, adopted by a flyback converter circuit including a transformer, including: determining an output voltage output from a secondary circuit of the transformer; feeding a feedback voltage based on the output voltage from the secondary circuit back to a primary circuit of the transformer; increasing a current limit and a switching frequency of a primary current with the feedback voltage; and supplying the primary current to a primary winding of the transformer.
摘要翻译：提供了反激式转换器的方法。由包括变压器的反激式转换器电路采用的方法，包括：确定从变压器的次级电路输出的输出电压; 基于来自次级回路的输出电压向变压器的初级电路馈送反馈电压; 用反馈电压增加初级电流的电流限制和开关频率; 并将一次电流提供给变压器的初级绕组。

8. 发明授权

US09190835B2 Power factor correction (PFC) power conversion apparatus and power conversion method thereof 有权
标题翻译：功率因数校正（PFC）功率转换装置及其功率转换方法
公开(公告)号：US09190835B2
公开(公告)日：2015-11-17
申请号：US13776736
申请日：2013-02-26
申请人： Power Forest Technology Corporation
发明人： Chun-Teh Chen
IPC分类号： H02M1/42 , H02H7/125 , H02M1/32 , H02M1/10 , H02M1/00
CPC分类号： H02H7/1252 , H02M1/10 , H02M1/32 , H02M1/4225 , H02M2001/0009 , H02M2001/0025 , Y02B70/126
摘要： A power factor correction (PFC) power conversion apparatus and a power conversion method thereof are provided. In the invention, by switching a detection switch disposed inside a control chip and connected to a detection pin of the control chip at a certain time, and performing a detection of an input voltage received by a boost power conversion circuit at the certain time through a collocation between a current detection auxiliary circuit and a current detection main circuit. Accordingly, an over current protection (OCP) point corresponding to whether an OCP mechanism is activated is compensated according to the detected result, and thus the detection manner of the OCP performed by the invention can be adaptively suitable for different input voltages. In the invention, according to the detected result, a brown out protection also can be performed, and the output of the boost power conversion circuit also can be changed or determined.
摘要翻译：提供功率因数校正（PFC）功率转换装置及其功率转换方法。在本发明中，通过在一定时间切换配置在控制芯片内部并与控制芯片的检测引脚相连的检测开关，并且通过一定时间对特定时刻的升压电力转换电路接收到的输入电压进行检测电流检测辅助电路和电流检测主电路之间的配置。因此，根据检测结果补偿对应于OCP机制是否被激活的过电流保护（OCP）点，因此本发明执行的OCP的检测方式可以适应于不同的输入电压。在本发明中，根据检测结果，也可以进行欠压保护，也可以改变或确定升压功率转换电路的输出。

9. 发明授权

US09113520B2 Light emitting diode backlight system the driving apparatus and driving method thereof 有权
标题翻译：发光二极管背光系统的驱动装置及其驱动方法
公开(公告)号：US09113520B2
公开(公告)日：2015-08-18
申请号：US13831718
申请日：2013-03-15
申请人： Power Forest Technology Corporation
发明人： Hsiu-Ping Lin
IPC分类号： H05B37/00 , H05B39/00 , H05B41/00 , H05B33/08
CPC分类号： H05B33/0815 , H05B33/0827 , H05B33/0845
摘要： A light emitting diode (LED) backlight system and a driving apparatus and a driving method thereof are provided. The driving apparatus is suitable for an LED backlight system with N LED strings, where N is a positive integer greater than 1, and which includes an LED driver and a switching unit. The LED driver is configured to receive a dimming signal and time-divisionally generate N control signals in response to a counting clock and an enabling time and a period time both related to the dimming signal. The switching unit is coupled to the LED driver and the N LED strings, and is configured to respectively control an on-off time ratio of a current flowing through each of the LED strings in response to the N control signals.
摘要翻译：提供了一种发光二极管（LED）背光系统及其驱动装置及其驱动方法。该驱动装置适用于具有N个LED串的LED背光系统，其中N是大于1的正整数，并且包括LED驱动器和开关单元。 LED驱动器被配置为响应于计数时钟和与调光信号相关的使能时间和周期时间而接收调光信号并且分时地产生N个控制信号。开关单元耦合到LED驱动器和N个LED串，并且被配置为响应于N个控制信号分别控制流过每个LED串的电流的开 - 关时间比。

10. 发明申请

US20140167630A1 LIGHT EMITTING DIODE BACKLIGHT SYSTEM THE DRIVING APPARATUS AND DRIVING METHOD THEREOF 有权
标题翻译：发光二极管背光系统驱动装置及其驱动方法
公开(公告)号：US20140167630A1
公开(公告)日：2014-06-19
申请号：US13831718
申请日：2013-03-15
申请人： POWER FOREST TECHNOLOGY CORPORATION
发明人： Hsiu-Ping Lin
IPC分类号： H05B33/08
CPC分类号： H05B33/0815 , H05B33/0827 , H05B33/0845
摘要： A light emitting diode (LED) backlight system and a driving apparatus and a driving method thereof are provided. The driving apparatus is suitable for an LED backlight system with N LED strings, where N is a positive integer greater than 1, and which includes an LED driver and a switching unit. The LED driver is configured to receive a dimming signal and time-divisionally generate N control signals in response to a counting clock and an enabling time and a period time both related to the dimming signal. The switching unit is coupled to the LED driver and the N LED strings, and is configured to respectively control an on-off time ratio of a current flowing through each of the LED strings in response to the N control signals.
摘要翻译：提供了一种发光二极管（LED）背光系统及其驱动装置及其驱动方法。该驱动装置适用于具有N个LED串的LED背光系统，其中N是大于1的正整数，并且包括LED驱动器和开关单元。 LED驱动器被配置为响应于计数时钟和与调光信号相关的使能时间和周期时间而接收调光信号并且分时地产生N个控制信号。开关单元耦合到LED驱动器和N个LED串，并且被配置为响应于N个控制信号分别控制流过每个LED串的电流的开 - 关时间比。

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