-
公开(公告)号：US09826608B2
公开(公告)日：2017-11-21
申请号：US14937038
申请日：2015-11-10
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Hyunchul Eum , Youngjong Kim , Kuo-Hsien Huang , Chih-Chun Chuang , Moon Ho Choi , Moon Sik Song
CPC classification number: H05B39/044 , H05B33/0815 , H05B33/083 , H05B33/0845 , Y02B20/146
Abstract: Provided is a standby current supplier including a bleeding circuit electrically connected to a dimmer and through which a first current flowing to the dimmer flows when the dimmer is in an off state, and a first controller configured to detect a first voltage corresponding to an input voltage generated by the dimmer and control the bleeding circuit based on the first voltage when the first voltage is lower than a predetermined first level.
-
Patent Agency Ranking
公开(公告)号：US10178729B2
公开(公告)日：2019-01-08
申请号：US15655010
申请日：2017-07-20
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Seunguk Yang , Moonsik Song , Hyunchul Eum
Abstract: A lighting circuit includes a light emitting diode (LED), a transistor that controls a current through the LED, and a lighting controller integrated circuit (IC) that controls the transistor to vary a brightness of the LED. The controller IC has a dimming pin that receives a dimming signal. The controller IC generates a low reference threshold and a high reference threshold that follow the dimming signal. The lighting controller IC controls the transistor by hysteretic control by comparing a sense signal indicative of the current through the LED to the low reference threshold and the high reference threshold.
-
公开(公告)号：US09872349B2
公开(公告)日：2018-01-16
申请号：US14937179
申请日：2015-11-10
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Hyunchul Eum , Youngjong Kim , Kuo-Hsien Huang , Chih-Chun Chuang , Young Mo Yang , Young Je Lee , Moon Ho Choi , Moon Sik Song
IPC: H05B33/08
CPC classification number: H05B33/0818 , H05B33/0809 , H05B33/0812 , H05B33/0815 , H05B33/0824 , H05B33/0845 , H05B33/0851 , Y02B20/343
Abstract: A phase-cut dimming control system according to the embodiment includes a phase angle detector configured to detect a phase angle of an input voltage generated by phase-cut dimming, a feedback signal generator configured to generate a first reference signal corresponding to the detected phase angle, and generate an initial feedback signal based on a detection signal corresponding to power supplied to a load and the first reference signal, a feedback signal modulator configured to modulate the initial feedback signal and generate a feedback signal, a power transmission controller configured to generate a control signal which controls power transmission according to the feedback signal, and a power transmission circuit configured to transmit power to the load according to the control signal.
-
公开(公告)号：US10412798B2
公开(公告)日：2019-09-10
申请号：US15835119
申请日：2017-12-07
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Hyunchul Eum , Youngjong Kim , Kuo-Hsien Huang , Chih-Chun Chuang , Young Mo Yang , Young Je Lee , Moon Ho Choi , Moon Sik Song
IPC: H05B33/08
Abstract: A phase-cut dimming control system according to the embodiment includes a phase angle detector configured to detect a phase angle of an input voltage generated by phase-cut dimming, a feedback signal generator configured to generate a first reference signal corresponding to the detected phase angle, and generate an initial feedback signal based on a detection signal corresponding to power supplied to a load and the first reference signal, a feedback signal modulator configured to modulate the initial feedback signal and generate a feedback signal, a power transmission controller configured to generate a control signal which controls power transmission according to the feedback signal, and a power transmission circuit configured to transmit power to the load according to the control signal.
-
公开(公告)号：US10091849B2
公开(公告)日：2018-10-02
申请号：US15655025
申请日：2017-07-20
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Seunguk Yang , Hyunchul Eum , Eungwoo Lee
Abstract: A lighting circuit includes a light emitting diode (LED), a transistor that controls a current through the LED, and a controller integrated circuit (IC) that controls the transistor to vary a brightness of the LED. The controller IC has a dimming pin that receives a hybrid dimming signal from a dimming input circuit. The dimming input circuit receives pulse width modulation (PWM) dimming signals and generates the hybrid dimming signal as a PWM dimming signal, an analog dimming signal, or both depending on the received PWM dimming signals.
-
公开(公告)号：US09900938B2
公开(公告)日：2018-02-20
申请号：US15388243
申请日：2016-12-22
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Jintae Kim , Hyunchul Eum , Inki Park , Eungwoo Lee
CPC classification number: H05B33/0812 , H02J3/01 , H02J3/18 , H02M1/12 , Y02B20/345
Abstract: A light emitting diode (LED) lighting circuit includes a ripple reducer. The ripple reducer includes a ripple detector, an adaptive offset generator, and a linear regulator. The ripple detector generates a ripple voltage that is indicative of a ripple current. The adaptive offset generator generates an adaptive offset voltage from the ripple voltage and from a voltage of a transistor. The linear regulator drives the transistor to regulate an LED current in accordance with a reference control voltage that is generated from the ripple voltage and the adaptive offset voltage.
-
-
-
-
-
Search Results
6
records
(took 0.014 seconds)
