Patents by Inventor Joo-Han Yoon
Joo-Han Yoon has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11955887Abstract: A switch control circuit and a switch control method are provided. In this circuit, compositions that sense a drain voltage of a switch device are added in a QR Buck Converter switch control circuit. A first resistor, a second switch, a second resistor are electrically connected to a drain terminal of a switch device to sense the 0 A state of an inductor current. On the basis of a detection result, the switch control circuit turns on the switch device when an inductor current is 0 A, and a drain sensing voltage (ZCD) is less than a predetermined reference voltage (REF).Type: GrantFiled: December 9, 2021Date of Patent: April 9, 2024Assignee: MagnaChip Semiconductor, Ltd.Inventors: Jang Hyuck Lee, Joo Han Yoon, Byoung Kwon An
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Patent number: 11728791Abstract: A switch control circuit and a switch control method are provided. The switch control circuit includes a load, an inductor, a control switch, and a sensing resistance connected in series to an input power source; an integrator that integrates a sensing voltage and a load current setting voltage to generate an integrated signal; a comparator that compares the integrated signal and a bias voltage; a switch driver that controls the control switch based on an output of the comparator and an output of an off time controller; and a gate sensor that outputs, to the integrator, a gate sensing signal that senses a time when an input of a gate terminal of the control switch becomes a low level. An integration operation is started from a position in which the integrated signal is located lower than the bias voltage, when an input of the gate terminal becomes a high level.Type: GrantFiled: April 27, 2022Date of Patent: August 15, 2023Assignee: MagnaChip Semiconductor, Ltd.Inventors: Jang Hyuck Lee, Joo Han Yoon, Byoung Kwon An
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Publication number: 20230113675Abstract: A switch control circuit and switch control method are provided. The switch control circuit and switch control method compensate an error of a load current that occurs because of the changing of a slope of an inductor current based on the increase and decrease of an input voltage. The switch control circuit includes a current compensation device that adjusts a gate on time based on a RC resistor and a control signal that senses a gate terminal of a control switch. The current compensation device compensates an error that occurs due to a signal delay to a gate terminal by increasing or decreasing a reference voltage or a sensing voltage, according to an increase or a decrease of an input voltage.Type: ApplicationFiled: June 17, 2022Publication date: April 13, 2023Applicant: Magnachip Semiconductor, Ltd.Inventors: Jang Hyuck LEE, Joo Han YOON
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Publication number: 20230016211Abstract: A switch control circuit and a switch control method are provided. The switch control circuit includes a load, an inductor, a control switch, and a sensing resistance connected in series to an input power; an integrator that integrates a sensing voltage and a load current setting voltage to generate an integrated signal; a comparator that compares the integrated signal and a bias voltage; a switch driver that controls the control switch based on an output of the comparator and an output of an off time controller; and a gate sensor that outputs, to the integrator, a gate sensing signal that senses a time when an input of a gate terminal of the control switch becomes a low level. An integration operation is started from a position in which the integrated signal is located lower than the bias voltage, when an input of the gate terminal becomes a high level.Type: ApplicationFiled: April 27, 2022Publication date: January 19, 2023Applicant: Magnachip Semiconductor, Ltd.Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN
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Patent number: 11490488Abstract: A switching driving circuit includes a switch configured to switch a current supplied to a target circuit, a sensing resistor connected to the switch, a controller configured to control the switch by comparing a sensing voltage applied to the sensing resistor with a reference voltage, and a compensation circuit configured to regulate the reference voltage based on an amount of variation of an input voltage input into the target circuit and an output voltage output from the target circuit.Type: GrantFiled: April 15, 2020Date of Patent: November 1, 2022Assignee: MagnaChip Semiconductor, Ltd.Inventors: Jang Hyuck Lee, Joo Han Yoon, Byoung Kwon An
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Publication number: 20220345041Abstract: A switch control circuit and a switch control method are provided. In this circuit, compositions that sense a drain voltage of a switch device are added in a QR Buck Converter switch control circuit. A first resistor, a second switch, a second resistor are electrically connected to a drain terminal of a switch device to sense the 0A state of an inductor current. On the basis of a detection result, the switch control circuit turns on the switch device when an inductor current is 0A, and a drain sensing voltage (ZCD) is less than a predetermined reference voltage (REF).Type: ApplicationFiled: December 9, 2021Publication date: October 27, 2022Applicant: Magnachip Semiconductor, Ltd.Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN
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Patent number: 11374492Abstract: An integration circuit is provided. The integration circuit includes a current source, a capacitor connected in series with the current source, a voltage source bias connected in series with the capacitor, a switch configured to connect a first node between the current source and the capacitor and a second node between the capacitor and the voltage source bias; and a switch control logic unit configured to control an on/off operation of the switch, wherein an integration operation is performed by the current source and the capacitor.Type: GrantFiled: March 26, 2020Date of Patent: June 28, 2022Assignee: MagnaChip Semiconductor, Ltd.Inventors: Jang Hyuck Lee, Joo Han Yoon, Byoung Kwon An, Jay Lee
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Publication number: 20210051785Abstract: A switching driving circuit includes a switch configured to switch a current supplied to a target circuit, a sensing resistor connected to the switch, a controller configured to control the switch by comparing a sensing voltage applied to the sensing resistor with a reference voltage, and a compensation circuit configured to regulate the reference voltage based on an amount of variation of an input voltage input into the target circuit and an output voltage output from the target circuit.Type: ApplicationFiled: April 15, 2020Publication date: February 18, 2021Applicant: MagnaChip Semiconductor, Ltd.Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN
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Publication number: 20210021191Abstract: An integration circuit is provided. The integration circuit includes a current source, a capacitor connected in series with the current source, a voltage source bias connected in series with the capacitor, a switch configured to connect a first node between the current source and the capacitor and a second node between the capacitor and the voltage source bias; and a switch control logic unit configured to control an on/off operation of the switch, wherein an integration operation is performed by the current source and the capacitor.Type: ApplicationFiled: March 26, 2020Publication date: January 21, 2021Applicant: MagnaChip Semiconductor Ltd.Inventors: Jang Hyuck LEE, Joo Han YOON, Byoung Kwon AN, Jay LEE
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Patent number: 8773349Abstract: A backlight driving circuit that provides backlight to a display panel of a display apparatus includes a power supply unit configured to supply power, a converter configured to convert and output a voltage of the supplied power, a light-emitting module supplied with the outputted voltage from the converter and providing the backlight, a switch connected to an output terminal of the light-emitting module and controlling an operation of the light-emitting module, a feedback resistor connected to an output terminal of the switch and sensing a voltage of a current flowing in the light-emitting module, a short-circuit sensing resistor connected between a ground of the power supply unit and a ground of the feedback resistor, and a short-circuit sensor configured to sense a voltage value of a current applied to the feedback resistor or the short-circuit sensing resistor according to whether the switch is switched on or off.Type: GrantFiled: January 13, 2012Date of Patent: July 8, 2014Assignee: Magnachip Semiconductor, Ltd.Inventors: Joo-han Yoon, Young-gi Ryu
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Publication number: 20120182328Abstract: A backlight driving circuit that provides backlight to a display panel of a display apparatus includes a power supply unit configured to supply power, a converter configured to convert and output a voltage of the supplied power, a light-emitting module supplied with the outputted voltage from the converter and providing the backlight, a switch connected to an output terminal of the light-emitting module and controlling an operation of the light-emitting module, a feedback resistor connected to an output terminal of the switch and sensing a voltage of a current flowing in the light-emitting module, a short-circuit sensing resistor connected between a ground of the power supply unit and a ground of the feedback resistor, and a short-circuit sensor configured to sense a voltage value of a current applied to the feedback resistor or the short-circuit sensing resistor according to whether the switch is switched on or off.Type: ApplicationFiled: January 13, 2012Publication date: July 19, 2012Applicant: MAGNACHIP SEMICONDUCTOR, LTD.Inventors: Joo-han Yoon, Young-gi Ryu
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Patent number: 7518836Abstract: A switching mode power supply and a corresponding method of protection operation is presented. A switching controller of the switching mode power supply receives current sensing information corresponding to the current flowing through a main switch and feedback information corresponding to an output voltage through a single terminal, and performs a protection operation when the voltage at the terminal is maintained to be lower than a reference voltage for more than a predetermined time frame. The power supply requires a low number of terminals, while preserving the protection operation function.Type: GrantFiled: February 22, 2006Date of Patent: April 14, 2009Assignee: Fairchild Korea Semiconductor, Ltd.Inventors: Jung-Won Kim, Joo-Han Yoon
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Publication number: 20060209481Abstract: A switching mode power supply and a corresponding method of protection operation is presented. A switching controller of the switching mode power supply receives current sensing information corresponding to the current flowing through a main switch and feedback information corresponding to an output voltage through a single terminal, and performs a protection operation when the voltage at the terminal is maintained to be lower than a reference voltage for more than a predetermined time frame. The power supply requires a low number of terminals, while preserving the protection operation function.Type: ApplicationFiled: February 22, 2006Publication date: September 21, 2006Inventors: Jung-Won Kim, Joo-Han Yoon