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公开(公告)号：US10250238B2
公开(公告)日：2019-04-02
申请号：US15661690
申请日：2017-07-27
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Taesung Kim , Seunguk Yang , Youngbae Park
Abstract: Examples of a signal calculator include a voltage multiplier and a time divider. The voltage multiplier copies time information corresponding to a first voltage and generates a third voltage using a second current corresponding to a second voltage during a first period corresponding to the copied time information. The time divider generates an output according to a result of comparing a voltage generated by a first current on the basis of a voltage corresponding to a first time with a second voltage corresponding to a second time.
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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.
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公开(公告)号：US09748935B2
公开(公告)日：2017-08-29
申请号：US15166847
申请日：2016-05-27
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Taesung Kim , Seunguk Yang , Youngbae Park
Abstract: Examples of a signal calculator include a voltage multiplier and a time divider. The voltage multiplier copies time information corresponding to a first voltage and generates a third voltage using a second current corresponding to a second voltage during a first period corresponding to the copied time information. The time divider generates an output according to a result of comparing a voltage generated by a first current on the basis of a voltage corresponding to a first time with a second voltage corresponding to a second time.
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Patent Agency Ranking
公开(公告)号：US10405381B2
公开(公告)日：2019-09-03
申请号：US15601034
申请日：2017-05-22
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Minwoo Lee , Moonsik Song , Seunguk Yang
Abstract: A light emitting diode (LED) control circuit includes an inductor current sense circuit with a high-side diode string, a low-side diode string, and a sense resistor in series with and between the high-side and low side diode strings. The LED control circuit receives an input voltage on an end that connects to the high-side diode string. An end of the low-side diode string is connected to a switch through an inductor. A sense voltage developed on the sense resistor by an inductor current is sensed by a controller integrated circuit (IC). A pin of the controller IC that receives the sense voltage can have a breakdown voltage specification that is lower than the input voltage.
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公开(公告)号：US10104728B2
公开(公告)日：2018-10-16
申请号：US15380254
申请日：2016-12-15
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Minwoo Lee , Moonsik Song , Seunguk Yang
Abstract: A light emitting diode (LED) driving circuit disclosed herein controls a switching operation of a power switch connected to an LED string and includes a reference voltage generator configured to generate a frequency modulation reference voltage according to a dimming signal that controls brightness of the LED string, and a switching controller configured to control a switching frequency of the power switch to be constant when a level of the dimming signal is higher than that of the frequency modulation reference voltage, and control the switching frequency of the power switch based on the dimming signal when a level of the dimming signal is lower than that of the frequency modulation reference voltage.
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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.
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公开(公告)号：US10432187B2
公开(公告)日：2019-10-01
申请号：US15718338
申请日：2017-09-28
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Taesung Kim , Seunguk Yang , Inki Park
IPC: H03B1/00 , H03K3/00 , H03K17/16 , H02M3/335 , H03K5/1532 , H03K17/60 , H03K17/082 , H03K17/687 , H02M1/00
Abstract: A power supply device includes a power switch that is switched according to a gate voltage. A sense resistor receives a switch current that flows through the power switch to develop a sense voltage. A peak of a primary-side current is detected from the sense voltage. The gate driver has a pair of switches for generating the gate voltage in accordance with a control signal. When a low-side switch of the gate driver is turned on according to the control signal, the gate voltage of the power switch decreases as a sink current flows from the gate of the power switch via the transistor.
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8.发明授权公开(公告)号：US09986607B2
公开(公告)日：2018-05-29
申请号：US15610706
申请日：2017-06-01
Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.
Inventor： Inki Park , Taesung Kim , Seunguk Yang
CPC classification number: H05B33/0815 , H05B33/0842 , H05B33/089
Abstract: An LED control circuit controls a switching operation of a switch by hysteretic control. The LED control circuit includes a controller integrated circuit (IC) that senses a current sense voltage from a current sense resistor that is on a low-side of the switch. The LED control circuit senses the current sense voltage during on-time of the switch to determine when to turn off the switch. During off-time of the switch, the controller IC determines when to turn on the switch by comparing a sawtooth voltage to a turn-on threshold that is generated from the on-time of the switch.
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