公开(公告)号：US09570990B2

公开(公告)日：2017-02-14

申请号：US14715620

申请日：2015-05-19

Applicant: NOVATEK Microelectronics Corp.

Inventor： Ke-Horng Chen ,  Chao-Chang Chiu ,  Hao-Yuan Lin ,  Che-Hao Meng ,  Chih-Wei Chang ,  Ying-Hsiang Wang

IPC: H02M3/335 ,  G01R19/10

CPC classification number: H02M3/33507 ,  G01R19/10 ,  H02M3/3353

Abstract: A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.

Abstract translation: 提供了一种用于回扫转换器的膝盖电压检测器。 所述膝盖电压检测器包括延迟单元，用于延迟辅助相关电压达一段特定周期，以产生延迟信号; 减法单元，用于根据所述辅助相关电压和所述延迟信号产生减法信号; 比较单元，用于当减法信号指示辅助相关电压和延迟信号之间的电压差大于阈值时产生采样信号; 以及采样保持单元，用于当辅助相关电压和延迟信号之间的电压差大于阈值时，根据采样信号采样延迟信号以产生拐点电压。

公开(公告)号：US20160211755A1

公开(公告)日：2016-07-21

申请号：US14715620

申请日：2015-05-19

Applicant: NOVATEK Microelectronics Corp.

Inventor： Ke-Horng Chen ,  Chao-Chang Chiu ,  Hao-Yuan Lin ,  Che-Hao Meng ,  Chih-Wei Chang ,  Ying-Hsiang Wang

IPC: H02M3/335 ,  G01R19/10

CPC classification number: H02M3/33507 ,  G01R19/10 ,  H02M3/3353

Abstract: A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.

Abstract translation: 提供了一种用于回扫转换器的膝盖电压检测器。 所述膝盖电压检测器包括延迟单元，用于延迟辅助相关电压达一段特定周期，以产生延迟信号; 减法单元，用于根据所述辅助相关电压和所述延迟信号产生减法信号; 比较单元，用于当减法信号指示辅助相关电压和延迟信号之间的电压差大于阈值时产生采样信号; 以及采样保持单元，用于当辅助相关电压和延迟信号之间的电压差大于阈值时，根据采样信号采样延迟信号以产生拐点电压。