Patents Assigned to Fairchild Korea Semiconductor Ltd.
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Publication number: 20170310101Abstract: A bi-directional transmitter/receiver according to an embodiment includes a pin connected with a main control circuit, a transistor connected with a first electrode to the pin, a Schmitt trigger which determines an output according to a voltage of the pin, and a temperature sensor which is connected to the pin and which senses temperature and outputs temperature information to the pin. A driving circuit for controlling switching operation of one or more switches includes a bi-directional transmitter/receiver.Type: ApplicationFiled: July 13, 2017Publication date: October 26, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR, LTD.Inventors: Jinkyu CHOI, Wonhi OH, Kinam SONG, Hyunsoo BAE, Samuell SHIN
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Publication number: 20170310231Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: ApplicationFiled: July 10, 2017Publication date: October 26, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Won-Tae LEE, Hyeong Seok BAEK, Ji-Hoon JANG, Hang-Seok CHOI, Moon-Ho CHOI
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Patent number: 9800136Abstract: An active damper and a power supply according to exemplary embodiments include: a damper resistor coupled to an input voltage; a damper switch coupled in parallel with the damper resistor; and a capacitor to which a reset current generated by a leading edge of the input voltage flows. The damper switch is turned off by the reset current.Type: GrantFiled: October 29, 2014Date of Patent: October 24, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Hyun-Chul Eum, Young-Jong Kim
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Patent number: 9781790Abstract: A phase shift circuit includes an on signal generator, an off signal generator, and a channel signal generator. The on signal generator generates an on signal having a rising edge shifted by a predetermined phase based on a pulse width modulation (PWM) signal, the off signal generator generates an off signal based on the PWM signal and the on signal, and the channel signal generator generates a channel signal that is enabled in response to the rising edge of the on signal and disabled in response to a rising edge of the off signal.Type: GrantFiled: September 16, 2011Date of Patent: October 3, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventor: Youn-woong Chung
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Publication number: 20170264206Abstract: An active clamp flyback converter includes a low-side switch that serves as a power switch and a high-side switch that serves as a clamp switch. The high-side switch is operated in one of two active clamp switching modes, which is selected based on load condition. In a complementary active clamp mode, the switching frequency of the low-side switch is decreased as the load increases. In a modified active clamp mode, the high-side switch is turned on in a same switching cycle first by zero voltage switching (ZVS) and second by quasi-resonant switching (QRS), with a QRS blanking time being increased as the load decreases. A ZVS delay time and dead time between switching are adaptively set based on a duty cycle of the low-side switch. The output voltage of the active clamp flyback converter is sensed from an auxiliary voltage of an auxiliary winding of the transformer.Type: ApplicationFiled: January 30, 2017Publication date: September 14, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Dibyendu RANA, Gwanbon KOO
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Patent number: 9762068Abstract: A wireless power transmission system according to an exemplary embodiment of the present invention includes: a source coil at a primary side; a load coil at a secondary side; and at least two intermediate coils coupled with each other in an insulated manner with a predetermined turn ratio with respect to the source coil. An effective inductance of the source coil is increased by the at least two intermediate coils and thus a coupling coefficient between the source coil and the load coil is increased.Type: GrantFiled: September 23, 2014Date of Patent: September 12, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: SangCheol Moon, Gwanbon Koo
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Patent number: 9755625Abstract: A pulse generator includes a first inverter configured to inverse an input pulse and output a result, a second inverter configured to inverse the output of the first inverter and output a result, a clamp inverter configured to generate a clamping voltage by clamping the output of the second inverter and generate an output pulse through a source follower which operates according to the clamping voltage, and a temperature compensator configured to compensate for variations in the clamping voltage caused by temperature change.Type: GrantFiled: April 29, 2015Date of Patent: September 5, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Kinam Song, Wonhi Oh, Jinkyu Choi, Taesung Kwon, Seunghyun Hong
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Patent number: 9748935Abstract: 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.Type: GrantFiled: May 27, 2016Date of Patent: August 29, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Taesung Kim, Seunguk Yang, Youngbae Park
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Patent number: 9748849Abstract: Provided is regulation of a line current. The regulation of the line current includes comparing a reference voltage with a line sensing voltage to generate a feedback voltage, and controlling a switching operation of a power switch using the feedback voltage. The reference voltage may be a voltage having a constant level, a voltage which varies according to an output current, or a voltage which follows a sine wave to compensate a power factor. Provided is sensing of an output current. The sensing of the output current includes sensing the output current using a feedback voltage corresponding to a voltage between both terminals of an inductor connected to a power switch, a peak of current flowing through the power switch, and a switching cycle of the power switch.Type: GrantFiled: July 7, 2014Date of Patent: August 29, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Hyun-Chul Eum, Young-Jong Kim, In-Ki Park
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Publication number: 20170243951Abstract: Provided are a power device having an improved field stop layer and a method of manufacturing the same. The method can include performing a first ion implant process by implanting impurity ions of a first conductive type into a front surface of a semiconductor substrate to form an implanted field stop layer where the semiconductor substrate is the first conductive type. The method can include performing a second ion implant process by implanting impurity ions of the first conductive type into a first part of the implanted field stop layer such that an impurity concentration of the first part of the implanted field stop layer is higher than an impurity concentration of a second part of the implanted field stop layer.Type: ApplicationFiled: May 5, 2017Publication date: August 24, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Kyu-hyun LEE, Young-chul KIM, Kyeong-seok PARK, Bong-yong LEE, Young-chul CHOI
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Publication number: 20170237352Abstract: A power supply includes a phase-cut pre-regulator. The phase-cut pre-regulator comprises a switching device connected between a line voltage and an input voltage of a bulk capacitor and a comparator receiving the line voltage and a reference voltage, comparing the line voltage with hysteresis reference voltages based on the reference voltage, and switching the switching device according to the compared result.Type: ApplicationFiled: May 4, 2017Publication date: August 17, 2017Applicant: Fairchild Korea Semiconductor, Ltd.Inventors: Charlie WANG, Sang Cheol MOON, Young-Bae PARK
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Patent number: 9735565Abstract: A bi-directional transmitter/receiver according to an embodiment includes a pin connected with a main control circuit, a transistor connected with a first electrode to the pin, a Schmitt trigger which determines an output according to a voltage of the pin, and a temperature sensor which is connected to the pin and which senses temperature and outputs temperature information to the pin. A driving circuit for controlling switching operation of one or more switches includes a bi-directional transmitter/receiver.Type: GrantFiled: June 24, 2015Date of Patent: August 15, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Jinkyu Choi, Wonhi Oh, Kinam Song, Hyunsoo Bae, Samuell Shin
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Patent number: 9729072Abstract: A resonant converter includes a first switch on a primary side and a second switch coupled to the first switch, a first synchronous rectification switch on a secondary side conducted according to a switching operation of the first switch, a second synchronous rectification switch on the secondary side conducted according to a switching operation of the second switch, and a switch control circuit configured to detect a waveform of one end voltage of at least one of the first synchronous rectification switch and the second synchronous rectification switch, determine one of a below region and an above region, and differently control conduction duration of the first and second synchronous rectification switches according to a determined result.Type: GrantFiled: February 11, 2015Date of Patent: August 8, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Won-Tae Lee, Hyeong Seok Baek, Ji-Hoon Jang, Hang-Seok Choi, Moon-Ho Choi
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Publication number: 20170215238Abstract: 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.Type: ApplicationFiled: December 22, 2016Publication date: July 27, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Jintae KIM, Hyunchul EUM, Inki PARK, Eungwoo LEE
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Patent number: 9716399Abstract: A vehicle charger includes a power supply device, a communication module, a reference changing unit, a compensator, a controller, and a gate driver. The power supply device changes an input voltage into a voltage required to charge a portable device and outputs the changed voltage. The communication module receives information on at least one of a voltage and a current, which are required to charge the portable device. The reference changing unit generates at least one of a reference voltage and a reference current based on the information on the at least one of the voltage and the current. The compensator generates a compensation signal based on a result obtained by comparing the at least one of the reference voltage and the reference current with at least one of a sensed voltage and a sensed current, which are obtained by sensing at least one of an output voltage of the power supply device and a current supplied from the power supply device to the portable device.Type: GrantFiled: May 7, 2015Date of Patent: July 25, 2017Assignee: Fairchild Korea Semiconductor Ltd.Inventors: Bong-Geun Chung, Youngbae Park, Gwanbon Koo
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Publication number: 20170207008Abstract: A circuit board for an electronic device includes pattern areas on both sides of the circuit board. Each end of a thermistor is electrically connected to electrically conductive pads on pattern areas on the top and bottom sides of the circuit board. An input plug is electrically connected to an end of the thermistor. The input plug is electrically connected to the thermistor by way of an input connector to which the circuit board is inserted.Type: ApplicationFiled: December 22, 2016Publication date: July 20, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: BongGeun CHUNG, YoonJoo YOU
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Publication number: 20170200552Abstract: A planar transformer includes a magnetic core and a multilayer printed circuit board. A primary winding of the planar transformer is formed by winding traces on several layers of the printed circuit board. A layer of the printed circuit board that has a winding trace of the primary winding has a winding trace of another winding of the planar transformer, such as a winding trace of an auxiliary winding or a winding trace of a shield winding. The planar transformer further includes a secondary winding. The secondary winding can be a solid wire or a winding trace on a layer of the printed circuit board.Type: ApplicationFiled: December 9, 2016Publication date: July 13, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: BongGeun CHUNG, GwanBon KOO, TaeSung KIM, YoonJoo YOU
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Publication number: 20170194853Abstract: Provided is a power factor correction circuit including an inductor having one end to which an input voltage is applied; a power switch connected between another end of the inductor and the ground, and configured to control an output of the power factor correction circuit; and a power factor correction controller configured to calculate a duty of the power switch on the basis of an output detection voltage corresponding to the output and an inductor current flowing through the inductor, calculate conduction-period information regarding a conduction period in which the inductor current flows in one switching cycle of the power switch, and compensate the calculated duty on the basis of the conduction-period information.Type: ApplicationFiled: December 28, 2016Publication date: July 6, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Jintae KIM, Hangseok CHOI, SangCheol MOON
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Publication number: 20170181237Abstract: A reference voltage generator disclosed herein includes an amplifier including two input terminals connected to a dimming signal and a first node, respectively, and an output terminal, a first transistor including a gate connected to the output terminal of the amplifier and one electrode connected to the first node, second and third transistors configured to form a current mirror, and two resistors connected between one electrode of the second transistor and one electrode of the first transistor.Type: ApplicationFiled: December 15, 2016Publication date: June 22, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventors: Minwoo LEE, Moonsik SONG
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Publication number: 20170179809Abstract: A switch control circuit includes a first pin connected to a first voltage, and a second pin connected to another end of a first resistor including an end connected to the first pin and a first capacitor. In the switch control circuit, at least two of first dead time information, second dead time information, and a protection mode are set by using a multi-voltage of the second pin. The first dead time information is information about a dead time of a first switch and a second switch controlling power supply, the second dead time information is information about a dead time for synchronous rectification, and the protection mode includes an auto-restart mode and a latch mode.Type: ApplicationFiled: March 1, 2017Publication date: June 22, 2017Applicant: FAIRCHILD KOREA SEMICONDUCTOR LTD.Inventor: Hang-Seok CHOI