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公开(公告)号：US20170264203A1
公开(公告)日：2017-09-14
申请号：US15442886
申请日：2017-02-27
Applicant: Microchip Technology Incorporated
Inventor： Simon Krugly , Alexander Mednik , Marc Tan , Rohit Tirumala
CPC classification number: H02M3/33507 , H02M1/08 , H02M1/4258 , H02M2001/0003 , H02M2001/0009 , H02M2001/0025 , H02M2001/0054 , Y02B70/126 , Y02B70/1491
Abstract: A high power-factor buck-boost converter having a rectified low-frequency AC line voltage input and a DC output is provided. The converter may include a magnetic element, a controlled switch having a gate terminal and a drain terminal that is coupled to the magnetic element, a rectifier diode coupled to the magnetic element, an output smoothing capacitor coupled to the rectifier diode, and a control circuit having an output coupled to the gate terminal of the controlled switch for repeatedly turning the controlled switch off for a first time duration and on for a second time duration. The second time duration may be determined as a function of the first time duration immediately preceding the second time duration.
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公开(公告)号：US20160262227A1
公开(公告)日：2016-09-08
申请号：US15051335
申请日：2016-02-23
Applicant: Microchip Technology Incorporated
Inventor： Alexander Mednik , Rohit Tirumala
IPC: H05B33/08
CPC classification number: H05B33/0815 , H05B33/0845 , Y02B20/345 , Y02B20/347
Abstract: A constant-current controller with square wave input current shaping for driving a series of light emitting diodes (LEDs) is provided. The controller may include a sample and hold circuit that samples a current sense voltage, a first multiplier circuit that multiplies an output of the sample and hold circuit, an error detector circuit that compares an output of the multiplier circuit with a reference voltage, an error amplifier that amplifies an output of the error detector circuit, a second multiplier circuit that multiplies an output of the error amplifier by a coefficient, and an output circuit that outputs a pulse-width modulated control signal based on an output of the second multiplier circuit. The coefficient may vary depending on whether the constant-current LED driver controller is used with a boost converter or a buck-boost converter.
Abstract translation: 提供了一种用于驱动一系列发光二极管（LED）的方波输入电流整形的恒流控制器。 控制器可以包括对电流检测电压进行采样的采样和保持电路，将采样和保持电路的输出相乘的第一乘法器电路，将乘法电路的输出与参考电压进行比较的误差检测器电路，误差 放大器，其放大误差检测器电路的输出，将误差放大器的输出乘以系数的第二乘法器电路和基于第二乘法器电路的输出输出脉宽调制控制信号的输出电路。 该系数可以根据恒流LED驱动器控制器是用于升压转换器还是降压 - 升压转换器而变化。
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Patent Agency Ranking
3.发明申请公开(公告)号：US20190222110A1
公开(公告)日：2019-07-18
申请号：US16236507
申请日：2018-12-30
Applicant: Microchip Technology Incorporated
Inventor： Rohit Tirumala , Tommy Ho , Fu-Ho Lee , Miguel A. Salcedo
Abstract: An apparatus and method for reducing an output voltage ripple of a converter are provided. The apparatus may include a controller for controlling a converter, wherein the controller may include a clock generating circuit that generates a periodic clock signal containing periodic clock pulses, and a control circuit that causes the clock generating circuit to asynchronously initiate a clock pulse based on a difference between a feedback voltage of the converter and a reference voltage. The apparatus may also include an on-time modulation circuit which modulates the on-time based on the difference between the reference voltage and the sampled output voltage.
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公开(公告)号：US09661702B2
公开(公告)日：2017-05-23
申请号：US15051335
申请日：2016-02-23
Applicant: Microchip Technology Incorporated
Inventor： Alexander Mednik , Rohit Tirumala
IPC: H05B33/08
CPC classification number: H05B33/0815 , H05B33/0845 , Y02B20/345 , Y02B20/347
Abstract: A constant-current controller with square wave input current shaping for driving a series of light emitting diodes (LEDs) is provided. The controller may include a sample and hold circuit that samples a current sense voltage, a first multiplier circuit that multiplies an output of the sample and hold circuit, an error detector circuit that compares an output of the multiplier circuit with a reference voltage, an error amplifier that amplifies an output of the error detector circuit, a second multiplier circuit that multiplies an output of the error amplifier by a coefficient, and an output circuit that outputs a pulse-width modulated control signal based on an output of the second multiplier circuit. The coefficient may vary depending on whether the constant-current LED driver controller is used with a boost converter or a buck-boost converter.
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5.发明授权公开(公告)号：US11929715B2
公开(公告)日：2024-03-12
申请号：US17336504
申请日：2021-06-02
Applicant: Microchip Technology Incorporated
Inventor： Rohit Tirumala , Miguel Salcedo , Donald Humbert
IPC: H03F3/04 , G01R19/04 , H03F1/02 , H03K5/1532
CPC classification number: H03F1/0227 , G01R19/04 , H03K5/1532
Abstract: A circuit to modulate the power supply to track input or output voltages provided to or output by a plurality of amplifiers to reduce power dissipation is provided. The circuit may include a peak detection circuit configured to receive a plurality of voltages respectively corresponding to the plurality of amplifiers, and to detect and output information regarding a maximum instantaneous voltage from the received plurality of voltages, and a summing circuit configured to output a sum of the information regarding the maximum instantaneous voltage and an amplifier headroom voltage. A reference voltage may be provided for the supply voltage responsive to the output sum. The circuit may also include a scaling circuit configured to scale the output sum, and the reference voltage may be a scaled reference voltage output by the scaling circuit.
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6.发明授权公开(公告)号：US10560013B2
公开(公告)日：2020-02-11
申请号：US16236507
申请日：2018-12-30
Applicant: Microchip Technology Incorporated
Inventor： Rohit Tirumala , Tommy Ho , Fu-ho Lee , Miguel A. Salcedo
Abstract: An apparatus and method for reducing an output voltage ripple of a converter are provided. The apparatus may include a controller for controlling a converter, wherein the controller may include a clock generating circuit that generates a periodic clock signal containing periodic clock pulses, and a control circuit that causes the clock generating circuit to asynchronously initiate a clock pulse based on a difference between a feedback voltage of the converter and a reference voltage. The apparatus may also include an on-time modulation circuit which modulates the on-time based on the difference between the reference voltage and the sampled output voltage.
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公开(公告)号：US10103635B2
公开(公告)日：2018-10-16
申请号：US15442886
申请日：2017-02-27
Applicant: Microchip Technology Incorporated
Inventor： Simon Krugly , Alexander Mednik , Marc Tan , Rohit Tirumala
Abstract: A high power-factor buck-boost converter having a rectified low-frequency AC line voltage input and a DC output is provided. The converter may include a magnetic element, a controlled switch having a gate terminal and a drain terminal that is coupled to the magnetic element, a rectifier diode coupled to the magnetic element, an output smoothing capacitor coupled to the rectifier diode, and a control circuit having an output coupled to the gate terminal of the controlled switch for repeatedly turning the controlled switch off for a first time duration and on for a second time duration. The second time duration may be determined as a function of the first time duration immediately preceding the second time duration.
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