-
公开(公告)号：US10447082B2
公开(公告)日：2019-10-15
申请号：US15600372
申请日：2017-05-19
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu
Abstract: A wireless power transmitter circuit includes a power inverter circuit, a resonant transmitter circuit and a control circuit. The power inverter circuit converts a DC power to an AC output power which includes an AC output current. The resonant transmitter circuit, including a variable capacitor circuit, converts the AC output power to a resonant wireless power which includes a resonant current. The control circuit generates an impedance control signal according to a resonant current related signal and a current reference signal, for controlling the impedance of the variable capacitor circuit to regulate the resonant current or the AC output current substantially at a predetermined current level.
-
公开(公告)号：US20180375380A1
公开(公告)日：2018-12-27
申请号：US15984291
申请日：2018-05-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kuo-Chi Liu , Ke-Horng Chen
IPC: H02J50/12 , H02M7/5387 , H02M1/088
CPC classification number: H02J50/12 , H02M1/088 , H02M7/5387 , H02M2001/0048
Abstract: A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.
-
43.发明申请公开(公告)号：US20160336808A1
公开(公告)日：2016-11-17
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.
Abstract translation: 本发明提供一种谐振无线电力接收电路，包括：谐振电路，用于接收无线电力以产生AC谐振信号; 开关控制整流电路，其包括多模开关电路，用于将所述AC谐振信号整流为整流器输出信号以驱动负载，其中所述多模开关电路包括至少一个多模开关; 以及反馈控制电路，用于根据与整流器输出信号相关的反馈信号产生开关控制信号，以控制至少一个多模开关，使得其至少在谐振短路操作中操作以限制整流器输出信号 或调节整流器输出信号。 在谐振短路工作中，正谐振输出节点和负谐振输出节点由多模开关电路短路。
-
44.发明授权公开(公告)号：US12199506B2
公开(公告)日：2025-01-14
申请号：US18312512
申请日：2023-05-04
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: an output capacitor; a switched capacitor converter; and a control circuit. The switched capacitor converter includes: a switch circuit including fourth switches; an inductor coupled between the switch circuit and the output capacitor; and a flying capacitor coupled to the switch circuit, wherein the flying capacitor and the output capacitor constitute a voltage divider. The control circuit generates a PWM signal according to the second voltage and generates switch signals according to the PWM signal to control the switch circuit, so as to convert the first voltage to the second voltage. The control circuit decides whether the switched capacitor converter operates in a boundary conduction mode, a discontinuous conduction mode or a continuous conduction mode according to an output current or an output current related signal.
-
公开(公告)号：US20240372467A1
公开(公告)日：2024-11-07
申请号：US18637432
申请日：2024-04-16
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A multi-phase conversion circuit includes: a first and a second sub-conversion circuits; multiple switching signals control the first front switch-mode capacitor conversion circuit's first front capacitor and the first rear switch-mode capacitor conversion circuit's first rear capacitor, and the second front switch-mode capacitor conversion circuit's second front capacitor and the second rear switch-mode capacitor conversion circuit's second rear capacitor to switch between plural electrical connection states. This setup performs switched capacitor voltage division on the first voltage, selectively switching the first or second switching node between the first or second divided voltage derived from the switched capacitor voltage division and a reference potential, whereby performing power conversion between the first power node and the second power node.
-
Patent Agency Ranking
公开(公告)号：US12136876B2
公开(公告)日：2024-11-05
申请号：US18065205
申请日：2022-12-13
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter, a control circuit and a zero current estimation circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The zero current estimation circuit is coupled to the at least one inductor and/or the at least one resonant capacitor, for estimating a time point at which a first resonant current is zero during a first process and/or a time point at which a second resonant current is zero during a second process according to a voltage difference between two ends of the inductor, and/or a voltage difference between two ends of the resonant capacitor, to a generate a zero current estimation signal accordingly for generating the operation signal.
-
47.发明授权公开(公告)号：US12136875B2
公开(公告)日：2024-11-05
申请号：US18049622
申请日：2022-10-25
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
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.
-
公开(公告)号：US20240223086A1
公开(公告)日：2024-07-04
申请号：US18471266
申请日：2023-09-20
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang
CPC classification number: H02M3/1582 , H02M1/0009 , H02M1/0058 , H02M3/07
Abstract: A buck-boost switching converter for converting the power between a first and a second voltage, includes: a first sub-converter coupled between the first voltage and a first switching node, which includes a first plural switches and a capacitor; and a second sub-converter coupled between the second voltage and a second switching node, which includes a second plural switches. The first and second plural switches switch the capacitor and an inductor periodically, so as to divide the first voltage using the capacitor by a switched-capacitor (SC) voltage division method, and to switch the first switching node between a reference voltage and a voltage division of the first voltage, and to switch the second switching node between at least two voltages. The reference voltage is the first voltage, a ground or another voltage division of the first voltage. One of the at least two voltages is related to the second voltage.
-
公开(公告)号：US20240072633A1
公开(公告)日：2024-02-29
申请号：US18449182
申请日：2023-08-14
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Wei-Hsu Chang , Chao-Chi Chen
CPC classification number: H02M1/0058 , H02M1/0009 , H02M3/07
Abstract: The present invention provides a resonant switched capacitor voltage converter (RSCC), which is coupled to and operates synchronously with another RSCC. The RSCC includes: plural switches, a resonant inductor, a resonant capacitor, and a control circuit. The control circuit controls the switches, so that the resonant capacitor and the resonant inductor are connected in series to each other, to perform resonant operation in a switching period, thus converting an input voltage to an output voltage. The control circuit generates a zero current signal and a first synchronization signal when a resonant inductor current flowing through the resonant inductor is zero. The control circuit turns off at least one corresponding switch according to the zero current signal. The control circuit turns on at least one corresponding switch according to the zero-current signal and a second synchronization signal, so that the RSCC operates in synchronization with at least another RSCC.
-
公开(公告)号：US11742760B2
公开(公告)日：2023-08-29
申请号：US17520635
申请日：2021-11-06
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Chung-Lung Pai
CPC classification number: H02M3/1584 , H02M1/0006 , H02M1/36 , H02M3/01 , H02M3/07
Abstract: A resonant switching power converter includes: a power stage circuit and a driving circuit. The power stage circuit includes: a resonant capacitor, a resonant inductor and switches. The driving circuit includes: drivers for driving the switches; and a power supply circuit for providing driving powers to the drivers. The power supply circuit includes: a voltage booster circuit generating a booster power supply according to a clock signal, a DC voltage and an output related signal; driving capacitors, wherein a voltage across each driving capacitor corresponds to one driving power; and supply diodes, which are coupled in series from the booster power supply along a forward direction of the supply diodes. A backward end of each supply diode is coupled to a positive end of one corresponding driving power, to charge one corresponding driving capacitor, thus generating the corresponding driving power.
-
-
-
-
-
-
-
-
-
Search Results
80
records
(took 0.015 seconds)
