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11.发明授权公开(公告)号：US09787187B2
公开(公告)日：2017-10-10
申请号：US15217102
申请日：2016-07-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Hung-Yu Cheng
CPC classification number: H02M3/1582 , H02M1/08 , H02M2001/0054 , Y02B70/1491
Abstract: The present invention provides a dual constant time buck-boost switching regulator, and a control circuit and a method thereof. The buck-boost switching regulator converts an input voltage to an output voltage and it includes a buck circuit and a boost circuit. The buck circuit includes an inductor, a buck power switch and a buck power device. The boost circuit includes the inductor, a boost power switch and a boost power device. The present invention controls the buck power switch to be OFF by a constant OFF time in the buck conversion mode, and controls the boost power switch to be ON by a constant ON time in the boost conversion mode. An offset signal ensures that the buck-boost regulator operates only in pure buck conversion mode and pure boost conversion mode, but does not need to operate in a buck-boost conversion mode.
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Patent Agency Ranking
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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13.发明授权公开(公告)号：US12055964B2
公开(公告)日：2024-08-06
申请号：US18299985
申请日：2023-04-13
Applicant: Richtek Technology Corporation
Inventor： Hung-Yu Cheng , Keng-Hong Chu , Li-Chen Cheng , Tsung-Han Yu
CPC classification number: G05F1/565 , G05F1/561 , H03F3/45273 , H03F3/45475 , H03F2200/261
Abstract: A multi-loop error amplifier circuit for generating an error amplification signal includes: a first operational transconductance amplifier (OTA) including a first current output stage which generates a first transconductance amplification current in a predetermined current direction according to a first voltage difference between a positive terminal and a negative input terminal of the first OTA; a second OTA including a second current output stage which generates a second transconductance amplification current in the predetermined current direction according to a second voltage difference between a positive terminal and a negative input terminal of the second OTA. The first and the second current output stages are coupled in series to generate a first error output current. The error amplification signal is generated according to the first error output current which is equal to the smaller one of the first and the second transconductance amplification currents.
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14.发明公开公开(公告)号：US20230359232A1
公开(公告)日：2023-11-09
申请号：US18299985
申请日：2023-04-13
Applicant: Richtek Technology Corporation
Inventor： Hung-Yu Cheng , Keng-Hong Chu , Li-Chen Cheng , Tsung-Han Yu
CPC classification number: G05F1/565 , H03F3/45273 , G05F1/561 , H03F3/45475 , H03F2200/261
Abstract: A multi-loop error amplifier circuit for generating an error amplification signal includes: a first operational transconductance amplifier (OTA) including a first current output stage which generates a first transconductance amplification current in a predetermined current direction according to a first voltage difference between a positive terminal and a negative input terminal of the first OTA; a second OTA including a second current output stage which generates a second transconductance amplification current in the predetermined current direction according to a second voltage difference between a positive terminal and a negative input terminal of the second OTA. The first and the second current output stages are coupled in series to generate a first error output current. The error amplification signal is generated according to the first error output current which is equal to the smaller one of the first and the second transconductance amplification currents.
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公开(公告)号：US20230043119A1
公开(公告)日：2023-02-09
申请号：US17749052
申请日：2022-05-19
Applicant: Richtek Technology Corporation
Inventor： Hung-Yu Cheng , Chi-Hsun Wu
Abstract: A low EMI driver apparatus includes: a driver circuit configured to generate a driving signal according to a switch control signal, so as to drive at least one switch; and a driving strength control circuit configured to randomly control a driving strength of the driver circuit, thereby reducing an EMI generated when the at least one switch is driven according to the driving signal. In a specific form of the low EMI driver apparatus, the at least one switch includes plural switches, and the low EMI driver apparatus further includes: a dead time control circuit configured to randomly control a dead time between ON times of the plural switches, so as to reduce the EMI generated when the switches are driven according to the driving signal.
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公开(公告)号：US09395734B2
公开(公告)日：2016-07-19
申请号：US14669704
申请日：2015-03-26
Applicant: Richtek Technology Corporation
Inventor： Hung-Yu Cheng , Tzu-Huan Chiu , Shuo-Wen Chang
Abstract: A control circuit of a power converter includes: an error detection circuit, configured to operably generate an error signal according to a reference signal and a feedback signal when coupling with an external feedback node of an external feedback circuit; an output signal detecting circuit, positioned inside the control circuit, configured to operably receive and detect an output signal of the power converter to generate a representative signal; an on time deciding circuit, coupled with the output signal detecting circuit, configured to operably generate an on time signal according to the representative signal; and a control signal generating circuit, coupled with the error detection circuit and the on time deciding circuit, configured to operably control on time of one or more power switches of the power converter according to the error signal and the on time signal.
Abstract translation: 功率转换器的控制电路包括：误差检测电路，被配置为当与外部反馈电路的外部反馈节点耦合时，根据参考信号和反馈信号可操作地产生误差信号; 位于所述控制电路内部的输出信号检测电路被配置为可操作地接收和检测所述功率转换器的输出信号以产生代表信号; 与输出信号检测电路耦合的开启时间确定电路被配置为根据代表信号可操作地产生导通时间信号; 以及控制信号发生电路，与误差检测电路和导通时间确定电路相配合，被配置为根据误差信号和导通时间信号可操作地控制功率转换器的一个或多个功率开关的时间。
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