-
21.发明公开公开(公告)号：US20230179093A1
公开(公告)日：2023-06-08
申请号：US18049622
申请日：2022-10-25
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M3/07 , H02M3/015 , H02M1/0009
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit. In a charging process of a resonant operation mode, the switches in the switched capacitor converter operate to form a series connection of at least one capacitor and an inductor between a first voltage and a second voltage, as a charging path. In a discharging process of the resonant operation mode, the switches operate to form a series connection of each capacitor and the inductor between the second voltage and a ground level, thus forming plural discharging paths simultaneously or sequentially. In an inductor switching mode, the switches operate to couple one end of the inductor to the first voltage or the ground level alternatingly. The control circuit decides to operate in the resonant operation mode or the inductor switching mode according to the first voltage, thereby maintaining the second voltage within a predetermined range.
-
22.发明申请公开(公告)号：US20230028873A1
公开(公告)日：2023-01-26
申请号：US17838195
申请日：2022-06-11
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit; wherein the control circuit adjusts operation frequencies and/or duty ratios of operation signals which control switches of the switched capacitor converter, so as to adjust a ratio of a first voltage to a second voltage to a predetermined ratio. When the control circuit decreases the duty ratios of the operation signals, if a part of the switches of the switched capacitor converter are turned ON, an inductor current flowing toward the second voltage is in a first state; if the inductor current continues to flow via a current freewheeling path, the inductor current flowing toward the second voltage becomes in a second state. A corresponding inductor is thereby switched between the first state and the second state to perform inductive power conversion.
-
公开(公告)号：US10819209B2
公开(公告)日：2020-10-27
申请号：US16414811
申请日：2019-05-17
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chang-Yu Ho
Abstract: A multi-source energy harvester system includes a power conversion apparatus. First and second energy harvesters respectively harvest first and second energy and respectively provide first and second input powers. The power conversion apparatus includes an adjustable impedance matching circuit and a power conversion circuit. The impedance matching circuit generates an adjusted power according to the first input power. The power conversion circuit converts a bus power to an output power. The energy harvester system controls a first and a second switch circuits according to the adjusted power and/or the second input power to select and conduct one of the adjusted power or the second input power as the bus power, and adjusts an impedance of the adjustable impedance matching circuit to maximize a voltage of the adjusted power.
-
24.发明申请公开(公告)号：US20190386556A1
公开(公告)日：2019-12-19
申请号：US16414811
申请日：2019-05-17
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Chang-Yu Ho
Abstract: A multi-source energy harvester system includes a power conversion apparatus. First and second energy harvesters respectively harvest first and second energy and respectively provide first and second input powers. The power conversion apparatus includes an adjustable impedance matching circuit and a power conversion circuit. The impedance matching circuit generates an adjusted power according to the first input power. The power conversion circuit converts a bus power to an output power. The energy harvester system controls a first and a second switch circuits according to the adjusted power and/or the second input power to select and conduct one of the adjusted power or the second input power as the bus power, and adjusts an impedance of the adjustable impedance matching circuit to maximize a voltage of the adjusted power.
-
25.发明授权公开(公告)号：US09853505B2
公开(公告)日：2017-12-26
申请号：US15144553
申请日：2016-05-02
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei
CPC classification number: H02J50/12 , H02M7/217 , H02M7/219 , Y02B70/1441
Abstract: The present invention provides a resonant wireless power receiver circuit, including: a resonant circuit for receiving a wireless power to generate an AC resonant signal; a switch controlled rectifier circuit which includes a multi-mode switch circuit, for rectifying the AC resonant signal into a rectifier output signal to drive a load, wherein the multi-mode switch circuit includes at least one multi-mode switch; and a feedback control circuit for generating a switch control signal according to a feedback signal related to the rectifier output signal to control the at least one multi-mode switch such that it operates at least in a Resonance Short Circuit Operation to limit the rectifier output signal or to regulate the rectifier output signal. In the Resonance Short Circuit Operation, a positive resonant output node and a negative resonant output node are short-circuited by the multi-mode switch circuit.
-
Patent Agency Ranking
26.发明申请公开(公告)号：US20170085131A1
公开(公告)日：2017-03-23
申请号：US15095087
申请日：2016-04-10
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Wei-Hsin Wei , Chih-Hsien Wang
Abstract: The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.
-
公开(公告)号：US09059585B2
公开(公告)日：2015-06-16
申请号：US13729936
申请日：2012-12-28
Applicant: Richtek Technology Corporation
Inventor： Yen-Te Lee , Kuo-Chi Liu , Wen-Wei Chen , Yi-Fan Chen , Kuang-Feng Li
CPC classification number: H02H7/16 , H02M1/44 , H02M7/06 , H02M2001/322
Abstract: An independent bleeding integrated circuit device is provided to replace the bleeding resistor for an EMI filter capacitor, to establish a discharge path between the two terminals of the EMI filter capacitor when the EMI filter capacitor is disconnected from an AC power source, for discharging the EMI filter capacitor. When the EMI filter capacitor is connected with an AC power source, the discharge path is cut off to avoid power loss.
Abstract translation: 提供独立的出血集成电路器件来替代EMI滤波电容器的出血电阻器，当EMI滤波电容器与AC电源断开时，建立EMI滤波电容器的两个端子之间的放电路径，用于放电EMI 滤波电容器。 当EMI滤波电容器与交流电源连接时，放电路径被切断以避免功率损耗。
-
公开(公告)号：US20250112549A1
公开(公告)日：2025-04-03
申请号：US18661934
申请日：2024-05-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A switched capacitor converter for converting a first voltage into a second voltage and vice versa, includes: a plurality of switches which includes at least four switches, with a first switch included, which is coupled between the first voltage and an inductor switching node; an inductor coupled between the inductor switching node and the second voltage; a flying capacitor coupled to the plurality of switches and configured as a capacitive voltage divider; a current sense circuit for detecting an inductor current and sampling the inductor current during the first switch's turn-on state to generate a sensed current signal; an error amplifier for comparing the sensed current signal with a reference current signal to generate a first amplified signal; and a PWM generator for comparing the first amplified signal with a ramp signal for generating switching control signals to control a first switch current flowing to or from the first voltage.
-
公开(公告)号：US12199507B2
公开(公告)日：2025-01-14
申请号：US18525865
申请日：2023-12-01
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
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.
-
公开(公告)号：US11552547B2
公开(公告)日：2023-01-10
申请号：US17325778
申请日：2021-05-20
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
Abstract: A resonant switching power converter includes: at least one capacitor; switches coupled to the at least one capacitor; at least one charging inductor; at least one discharging inductor; and a zero current estimation circuit. The switches switch electrical connection relationships of capacitors according to an operation signal. The zero current estimation circuit estimates a time point at which a charging resonant current is zero during a charging process and/or estimate a time point at which a discharging resonant current is zero during at least one discharging process according to voltage differences across two ends of the charging inductor and/or the discharging inductor, so as to correspondingly generate a zero current estimation signal. The zero current estimation signal is adopted to generate the operation signal.
-
-
-
-
-
-
-
-
-
Search Results
80
records
(took 0.02 seconds)
