公开(公告)号：US09190835B2

公开(公告)日：2015-11-17

申请号：US13776736

申请日：2013-02-26

Applicant: Power Forest Technology Corporation

Inventor： Chun-Teh Chen

IPC: H02M1/42 ,  H02H7/125 ,  H02M1/32 ,  H02M1/10 ,  H02M1/00

CPC classification number: H02H7/1252 ,  H02M1/10 ,  H02M1/32 ,  H02M1/4225 ,  H02M2001/0009 ,  H02M2001/0025 ,  Y02B70/126

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20150288286A1

公开(公告)日：2015-10-08

申请号：US14303572

申请日：2014-06-12

Applicant: Power Forest Technology Corporation

Inventor： Kwan-Jen Chu

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M1/44 ,  H02M7/06 ,  H02M2001/0012 ,  H02M2001/007 ,  H02M2001/322

Abstract: A power supply apparatus is provided. The power supply apparatus includes a power conversion circuit, an AC safety capacitor and a control unit. An AC input voltage is received by an input side of the power converting circuit, and is converted to a DC output voltage. The AC safety capacitor is connected across the input side. The control unit controls the operation of the power converting circuit, where the control unit samples and holds a voltage between two terminals of the AC safety capacitor to obtain a holding voltage, and compares the holding voltage and the AC input voltage during each period of a clock signal, so as to decide to discharge electric energy stored by the AC safety capacitor according to a comparison result.

Abstract translation: 提供电源装置。 电源装置包括电力转换电路，交流安全电容器和控制单元。 交流输入电压由功率转换电路的输入侧接收，并被转换成直流输出电压。 交流安全电容器连接在输入端。 控制单元控制功率转换电路的操作，其中控制单元采样并保持AC安全电容器的两个端子之间的电压以获得保持电压，并且在每个周期期间比较保持电压和AC输入电压 时钟信号，以便根据比较结果决定放电由交流安全电容器存储的电能。

公开(公告)号：US09113520B2

公开(公告)日：2015-08-18

申请号：US13831718

申请日：2013-03-15

Applicant: Power Forest Technology Corporation

Inventor： Hsiu-Ping Lin

IPC: H05B37/00 ,  H05B39/00 ,  H05B41/00 ,  H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  H05B33/0845

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140167630A1

公开(公告)日：2014-06-19

申请号：US13831718

申请日：2013-03-15

Applicant: POWER FOREST TECHNOLOGY CORPORATION

Inventor： Hsiu-Ping Lin

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  H05B33/0845

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20140016378A1

公开(公告)日：2014-01-16

申请号：US13845099

申请日：2013-03-18

Applicant: POWER FOREST TECHNOLOGY CORPORATION

Inventor： Po-Jen Ke ,  Yun-Chi Chiang ,  Tso-Min Chen

IPC: H02H7/12 ,  H02M3/335

CPC classification number: H02H7/1213 ,  H02H7/122 ,  H02M1/32 ,  H02M3/33507 ,  H02M3/33523 ,  H02M2001/0022 ,  H02M2001/327

Abstract: A flyback-based power conversion apparatus and a power conversion method thereof are provided. By switching first and second detection switches disposed in a control chip and coupled to a multi-function pin of the control chip at different timings, the present invention applies a collocation of a voltage-current detection auxiliary circuit and a current detection circuit at a certain timing to execute a detection of the AC input voltage received by a flyback power conversion circuit, and the present invention applies a collocation of the auxiliary voltage-current detection circuit, an over temperature protection unit and an over voltage protection unit at another timing to execute detections of an over temperature protection and an over voltage protection. As the result, a single multi-function detection pin of the control pin is corresponding to a plurality of related function detections, so as to reduce the production cost of manufacturing the control chip.

Abstract translation: 提供了一种基于反激的电力转换装置及其电力转换方法。 通过切换设置在控制芯片中的第一和第二检测开关，并以不同的定时耦合到控制芯片的多功能引脚，本发明将某一电压电流检测辅助电路和电流检测电路的配置 定时执行由反激式电力转换电路接收的交流输入电压的检测，本发明在另一时刻应用辅助电压电流检测电路，过温保护单元和过电压保护单元的搭配来执行 检测过温保护和过压保护。 结果，控制引脚的单个多功能检测引脚对应于多个相关的功能检测，从而降低制造控制芯片的生产成本。

公开(公告)号：US20250105754A1

公开(公告)日：2025-03-27

申请号：US18509208

申请日：2023-11-14

Applicant: Power Forest Technology Corporation

Inventor： Che-Hao Meng ,  Chien Lung Li ,  Chia-Hsien Liu

IPC: H02M3/335 ,  H02M1/00

Abstract: A control circuit for a synchronous rectification switch of a power converter is provided. The synchronous rectification switch and a transformer of the power converter are coupled to a connection node. The control circuit includes a first logic circuit, an integrating circuit, a setting comparator, a logic gate, and a second logic circuit. The first logic circuit provides a detection signal according to a detection voltage on the connection node. The integrating circuit performs an accumulation operation on the integrated voltage value based on the detection signal to generate a setting pulse. The setting comparator provides a comparison signal according to the detection voltage and a first predetermined voltage. The logic gate outputs a setting signal according to the setting pulse and the comparison signal. The second logic circuit continuously provides a turn-on control signal in response to the setting signal. The synchronous rectification switch is turned on in response to the turn-on control signal.

公开(公告)号：US20250023443A1

公开(公告)日：2025-01-16

申请号：US18366707

申请日：2023-08-08

Applicant: Power Forest Technology Corporation

Inventor： Yu-Chao Lin ,  Kuan-Chun Fang ,  Zhi-Yang Zhang ,  Chien-Wei Kuan

IPC: H02M1/00 ,  H02M3/24

Abstract: A feedback circuit is used for a power supply device. The power supply device includes a primary side circuit and a secondary side circuit. The feedback circuit includes a feedback voltage generation circuit, a base voltage generation circuit, and a compensation signal generation circuit. The feedback voltage generation circuit is electrically connected to the secondary side circuit. The feedback voltage generation circuit generates a feedback voltage according to a bias voltage and an output voltage of the power supply device. The base voltage generation circuit generates a base voltage according to the feedback voltage. The compensation signal generation circuit generates a compensation signal according to the feedback voltage and the base voltage and provides the compensation signal to a controller in the primary side circuit. A voltage value of the feedback voltage is lower than a voltage value of the bias voltage. The voltage value of the feedback voltage varies with the change of the output voltage.

公开(公告)号：US20230350441A1

公开(公告)日：2023-11-02

申请号：US17897227

申请日：2022-08-29

Applicant: Power Forest Technology Corporation

Inventor： Hung-Chih Chiu

IPC: G05F1/46

CPC classification number: G05F1/46

Abstract: A power supply apparatus and an impedance adjustment method thereof are provided. An adjustment control circuit controls an impedance adjustment circuit to adjust an equivalent impedance of a feedback circuit according to variation of an output voltage of a power supply circuit, to adjust a feedback voltage in response to the variation of the output voltage.

公开(公告)号：US20220320887A1

公开(公告)日：2022-10-06

申请号：US17308064

申请日：2021-05-05

Applicant: Power Forest Technology Corporation

Inventor： Chia-Hsien Liu

IPC: H02J7/00 ,  H02M3/335

Abstract: A power supply apparatus and a discharge method thereof are provided. A control unit detects a cross-voltage across two ends of an AC safety capacitor to generate a detection voltage, compares the detection voltage with a threshold voltage, counts the number of cycles of the detection voltage during a period when the detection voltage does not cross the threshold voltage according to a comparison result between the detection voltage and the threshold voltage, and performs a discharge operation when the number of cycles is greater than or equal to a predetermined value to discharge electric energy stored in the AC safety capacitor.

公开(公告)号：US11036080B2

公开(公告)日：2021-06-15

申请号：US16558345

申请日：2019-09-03

Applicant: Power Forest Technology Corporation

Inventor： Chia-Hsien Liu

IPC: G02F1/1335 ,  G09G3/34 ,  H05B33/08 ,  G02F1/13357 ,  H05B45/48

Abstract: 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.