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公开(公告)号：US20220416652A1
公开(公告)日：2022-12-29
申请号：US17851015
申请日：2022-06-27
Applicant: Richtek Technology Corporation
Inventor： Chen-Pin Huang , Chia-Chun Li , Chen-Lin Hsu , Hung-Yu Cheng , Wan-Hsuan Yang
Abstract: A switching power converter includes: a power stage circuit, including at least one transistor which is configured to operably switch an inductor to convert an input power to an output power; and an active EMI filter circuit, including at least one amplifier, wherein the at least one amplifier is configured to operably sense a noise input signal which is related to a switching noise caused by the switching of the power stage circuit, and amplify the noise input signal to generate a noise canceling signal, wherein the noise canceling signal is injected into an input node of the switching power converter, so as to suppress the switching noise and thus reducing EMI, wherein the input power is provided through the input node to the power stage circuit.
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公开(公告)号：US12034367B2
公开(公告)日：2024-07-09
申请号：US17851015
申请日：2022-06-27
Applicant: Richtek Technology Corporation
Inventor： Chen-Pin Huang , Chia-Chun Li , Chen-Lin Hsu , Hung-Yu Cheng , Wan-Hsuan Yang
CPC classification number: H02M1/44 , H02M1/0009 , H02M1/34 , H02M3/158
Abstract: A switching power converter includes: a power stage circuit, including at least one transistor which is configured to operably switch an inductor to convert an input power to an output power; and an active EMI filter circuit, including at least one amplifier, wherein the at least one amplifier is configured to operably sense a noise input signal which is related to a switching noise caused by the switching of the power stage circuit, and amplify the noise input signal to generate a noise canceling signal, wherein the noise canceling signal is injected into an input node of the switching power converter, so as to suppress the switching noise and thus reducing EMI, wherein the input power is provided through the input node to the power stage circuit.
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公开(公告)号：US12249910B1
公开(公告)日：2025-03-11
申请号：US18736856
申请日：2024-06-07
Applicant: Richtek Technology Corporation
Inventor： Chen-Pin Huang , Chia-Chun Li , Chen-Lin Hsu , Hung-Yu Cheng , Wan-Hsuan Yang
Abstract: A switching power converter includes: a power stage circuit, including at least one transistor which is configured to operably switch an inductor to convert an input power to an output power; and an active EMI filter circuit, including at least one amplifier, wherein the at least one amplifier is configured to operably sense a noise input signal which is related to a switching noise caused by the switching of the power stage circuit, and amplify the noise input signal to generate a noise cancelling signal, wherein the noise cancelling signal is injected into an input node of the switching power converter, so as to suppress the switching noise and thus reducing EMI, wherein the input power is provided through the input node to the power stage circuit.
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公开(公告)号：US20240097567A1
公开(公告)日：2024-03-21
申请号：US18453586
申请日：2023-08-22
Applicant: Richtek Technology Corporation
Inventor： Hung-Yu Cheng , Wan-Hsuan Yang , Chi-Hsun Wu
CPC classification number: H02M3/158 , H02M1/0025 , H02M1/088 , H03K7/08
Abstract: A conversion control circuit is configured to generate a PWM (pulse width modulation) signal to control a power switch for switching an inductor to convert an input voltage to an output voltage. The steps of generating the PWM signal includes: enabling the PWM signal at a rising edge of a clock signal to turn on the power switch; disabling the PWM signal to turn off the power switch when an on-time exceeds a predetermined minimum on-time and the output voltage has reached an output level; triggering a next rising edge of the clock signal when the off-time exceeds a predetermined minimum off-time, the output voltage has not reached the output level, and a present cycle period of the clock signal has reached a predetermined cycle period.
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