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公开(公告)号：US20190190278A1
公开(公告)日：2019-06-20
申请号：US16133818
申请日：2018-09-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Jing-Meng Liu , Ta-Yung Yang
IPC: H02J7/00
CPC classification number: H02J7/007
Abstract: A charger circuit converts a supply voltage of a DC power supply to a charging voltage and a charging current to charge a battery. A battery charging method includes: setting the supply voltage to an initial voltage; checking whether the charging voltage reaches a predetermined voltage level; when the charging voltage is lower than the predetermined voltage level, delivering a control signal to the DC power supply to reduce the supply voltage; when the charging voltage or the charging current is reduced accordingly, delivering the control signal to the DC power to increase the supply voltage; and repetitively reducing and/or increasing the supply voltage until the charging voltage reaches the predetermined voltage level.
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公开(公告)号：US10170923B2
公开(公告)日：2019-01-01
申请号：US15951759
申请日：2018-04-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Ta-Yung Yang , Jing-Meng Liu , Isaac Y. Chen , Tzu-Chen Lin
Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by a mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current; a monitor circuit arranged to operably detect the DC voltage or the cable current; and a data processing circuit configured for controlling the power converting circuit according to the communication signal. The data processing circuit further communicates with the mobile device through the terminal communication interface and the connection terminal in response to a detection result of the monitor circuit.
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93.发明申请公开(公告)号：US20180301974A1
公开(公告)日：2018-10-18
申请号：US15878483
申请日：2018-01-24
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kun-Yu Lin , Tzu-Chen Lin , Wei-Hsu Chang , Ta-Yung Yang
Abstract: A flyback power converter circuit includes: a transformer, including a primary winding coupled to an input power and a secondary winding coupled to an output node; a primary side switch coupled to the primary winding for switching the input power to generate an output power on the output node through the secondary winding; a clamping circuit including an auxiliary switch and an auxiliary capacitor which are connected in series to form an auxiliary branch which is connected with the primary winding in parallel; and a conversion control circuit adjusting an auxiliary dead time according to a primary side switch related signal and a switching voltage related signal such that the primary side switch is zero voltage switching at a time point when the primary side switch is turned ON.
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公开(公告)号：US20170310136A1
公开(公告)日：2017-10-26
申请号：US15255092
申请日：2016-09-01
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Pei Yu Chiang
IPC: H02J7/00
CPC classification number: H02J7/0021 , H02J7/0045 , H02J7/0052 , H02J7/007 , H02J7/0072 , H02J2007/0059 , H02J2007/0062 , H02J2007/0096
Abstract: A charging apparatus includes a power conversion circuit for charging a battery, and a charging control circuit. The battery has a battery net voltage. The charging control circuit includes a conversion control circuit, a sensing circuit and a determining circuit. The conversion control circuit controls the power conversion circuit to generate plural pairs of DC output voltage levels and DC output current levels, wherein each DC output voltage level and its corresponding DC output current level are a voltage-current pair. The sensing circuit senses the DC output voltage levels and/or the DC output current levels. The determining circuit determines the battery net voltage according to plural voltage-current pairs.
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公开(公告)号：US12273038B2
公开(公告)日：2025-04-08
申请号：US18300458
申请日：2023-04-14
Applicant: Richtek Technology Corporation
Inventor： Yu-Chang Chen , Ta-Yung Yang , Kun-Yu Lin , Hsin-Yi Wu
Abstract: A resonant flyback power converter includes: a first transistor and a second transistor which are configured to switch a transformer and a resonant capacitor for generating an output voltage; and a switching control circuit generating first and second driving signals for controlling the first and the second transistors. The turn-on of the first driving signal magnetizes the transformer. The second driving signal includes a resonant pulse having a resonant pulse width and a ZVS pulse during the DCM operation. The resonant pulse is configured to demagnetize the transformer. The resonant pulse has a first minimum resonant period for a first level of the output load and a second minimum resonant period for a second level of the output load. The first level is higher than the second level and the second minimum resonant period is shorter than the first minimum resonant period.
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Patent Agency Ranking
公开(公告)号：US12273028B2
公开(公告)日：2025-04-08
申请号：US18168580
申请日：2023-02-14
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Yu-Chang Chen , Hsin-Yi Wu , Kun-Yu Lin
Abstract: A resonant asymmetrical half-bridge flyback power converter includes: a first transistor and a second transistor switching a transformer coupled to a capacitor for generating an output power; a voltage divider coupled to an auxiliary winding of the transformer; a differential sensing circuit which includes a first terminal and a second terminal coupled to the voltage divider to sense an auxiliary signal generated by the auxiliary winding for generating a peak signal and a demagnetization-time signal; and a PWM control circuit configured to generate a first PWM signal and a second PWM signal in accordance with the peak signal and the demagnetization-time signal, for controlling the first transistor and the second transistor respectively; wherein a period of an enabling state of the demagnetization-time signal is correlated to the output power level; wherein the peak signal is related to a quasi-resonance of the transformer after the transformer is demagnetized.
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97.发明申请公开(公告)号：US20250030337A1
公开(公告)日：2025-01-23
申请号：US18433417
申请日：2024-02-06
Applicant: Richtek Technology Corporation
Inventor： Kun-Yu Lin , Hsin-Yi Wu , Yu-Chang Chen , Fu-Ciao Syu , Chia-Hsien Yang , Chien-Fu Tang , Ta-Yung Yang
Abstract: A circuit of a resonant power converter comprising: a high-side switch and a low-side switch, coupled to form a half-bridge switching circuit which is configured to switch a transformer for generating an output voltage; a high-side drive circuit, generating a high-side drive signal coupled to drive the high-side switch in response to a high-side control signal; a bias voltage, coupled to a bootstrap diode and a bootstrap capacitor providing a power source from the bootstrap capacitor for the high-side drive circuit; wherein the high-side drive circuit generates the high-side drive signal with a fast slew rate to turn on the high-side switch when the high-side switch is to be turned on with soft-switching; the high-side drive circuit generates the high-side drive signal with a slow slew rate to turn on the high-side switch when the high-side switch is to be turned on without soft-switching.
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98.发明申请公开(公告)号：US20240413744A1
公开(公告)日：2024-12-12
申请号：US18463244
申请日：2023-09-07
Applicant: Richtek Technology Corporation
Inventor： Wei-Hsu Chang , Shih-Ho Hsu , Mao-Hui Kuo , Ta-Yung Yang
Abstract: A power factor correction control circuit for correcting a power factor of a rectified power to generate an output power supplied to a load, includes: a reference voltage generator circuit generating a reference voltage according to a rectified voltage of the rectified power; and a feedback modulation circuit generating a modulation control signal based upon the reference voltage and a feedback signal related to an output voltage of the output power, to control at least one switch of a power stage circuit to switch an inductor in the power stage circuit and to thereby regulate the output voltage. The reference voltage generator circuit selects one of at least two candidate voltages as the reference voltage according to a comparison result between the rectified voltage and at least one threshold, such that the output voltage is at least partially positively correlated with the rectified voltage.
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99.发明授权公开(公告)号：US12136877B2
公开(公告)日：2024-11-05
申请号：US18149112
申请日：2023-01-01
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Wei-Hsu Chang
Abstract: A switched capacitor voltage converter circuit for converting a first voltage to a second voltage, includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least two capacitors, plural switches and at least one inductor. In a mode switching period wherein the switched capacitor converter switches from a present conversion mode to a next conversion mode, at least two forward switches of the plural switches operate in a unidirectional conduction mode. Each of the forward switches provides a current channel that unidirectionally flows toward the second voltage in the unidirectional conduction mode. The switched capacitor voltage converter circuit is also operable to convert the second voltage to the first voltage.
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公开(公告)号：US20240297580A1
公开(公告)日：2024-09-05
申请号：US18525865
申请日：2023-12-01
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M3/07 , H02M1/0009
Abstract: A multi-phase switching converter includes: first and second sub-switching converters; switching signals operating first and second capacitors of the first and second sub-switching converters to respectively perform a switched capacitor switching on a first voltage between plural electrical connection states, to respectively switch a first and second switching nodes between a first and second divided voltages of the first voltage obtained from the switched capacitor switching and a first and second reference voltage potentials thereby performing the power conversion between a first and second power nodes. Each of a first and second switch circuits of the first and second sub-switching converters has corresponding plural first and second switches and corresponding first and second subsidiary switch. Each of the first and second subsidiary switch is coupled between the first and second capacitors and the first and second switching nodes, to respectively decide whether the first and second capacitor is electrically connected to a first and second inductor according to the switching signal corresponding to the first and second subsidiary switch, respectively.
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