Patents Assigned to Richtek Technology Corporation
-
Patent number: 12224683Abstract: A power conversion system includes: first and second switches, a switching power converter, a battery switch and a conversion control circuit. In an external power mode, the first and second switches are controlled to generate an intermediate power from a first power and generate a second power from the intermediate power for powering an external load. In a battery power mode, the conversion control circuit controls the battery switch, the switching power converter and the second switch to generate a system power from a battery power, convert the system power to generate the intermediate power and generate the second power from the intermediate power. In the external power mode, the switching power converter is controlled to enter the battery power mode when the intermediate voltage is reduced to a transient state threshold, wherein a minimum voltage level of the intermediate power is close to a minimum voltage regulation level.Type: GrantFiled: June 19, 2023Date of Patent: February 11, 2025Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Tsan-Huei Wu, Tsung-Wei Huang, Ye-Sing Luo
-
Patent number: 12224617Abstract: A power supply system includes: first and second external path selection circuits respectively controlling first and second powers at first and second nodes to be electrically connected to first or second system ports; and an internal path selection circuit controlling a third power at a third node or a fourth power at a fourth node to be electrically connected to one or more power conversion modules. The first and the second external path selection circuits, the internal path selection circuit and the power conversion modules perform one of the following operations: (1) receiving at least one external power from one or more of the first and second system port, to generate third power at the third node and/or generate fourth power at the fourth node; or (2) converting power from a battery, to generate at least one output power at the first and/or second system port.Type: GrantFiled: March 4, 2022Date of Patent: February 11, 2025Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Jian-Zhong Huang, Kuan-Hua Chen
-
Patent number: 12218591Abstract: A conversion control circuit, configured to control a switching power converter, includes a trigger signal generation circuit, an on-time control circuit, and a logic driver circuit. The trigger signal generation circuit is configured to generate a turn-on trigger signal. The on-time control circuit is configured to generate a turn-off trigger signal to determine the on-time and/or the off-time of a pulse width modulation (PWM) signal, and adjusts the on-time and/or the off-time according to the input voltage and the output voltage, such that the switching frequency of the switching power converter is adaptively adjusted according to a ratio between the output voltage and the input voltage. The logic driver circuit is configured to generate the PWM signal according to the turn-on trigger signal and the turn-off trigger signal, wherein the turn-on trigger signal enables the PWM signal, and the turn-off trigger signal disables the PWM signal.Type: GrantFiled: December 23, 2022Date of Patent: February 4, 2025Assignee: Richtek Technology CorporationInventors: Po-Yen Chen, Hsing-Shen Huang
-
Patent number: 12199506Abstract: 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.Type: GrantFiled: May 4, 2023Date of Patent: January 14, 2025Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuo-Chi Liu, Ta-Yung Yang, Wei-Hsu Chang
-
Patent number: 12199507Abstract: 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.Type: GrantFiled: December 1, 2023Date of Patent: January 14, 2025Assignee: Richtek Technology CorporationInventors: Kuo-Chi Liu, Ta-Yung Yang
-
Patent number: 12199516Abstract: A multi-phase switching converter, includes: plural sub-switching converters; and a control circuit. Plural switching signals operate a capacitor of one of the plural sub-switching converters and a capacitor of another one of the plural sub-switching converters, to conduct a switched capacitor switching on a first voltage, thus switching an inductor switching node in each sub-switching converter between a divided voltage of the first voltage and a reference potential and to thereby execute a power conversion between the first voltage and a second voltage. When the inductors of each of the plural sub-switching converters are coupled with one another in a non-electromagnetic fashion, the multi-phase switching converters operate in a non-resonant mode. When the inductors of at least two of the plural sub-switching converters are electromagnetically coupled with one another, the multi-phase switching converters operate in a resonant mode or in the non-resonant mode.Type: GrantFiled: October 13, 2023Date of Patent: January 14, 2025Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuo-Chi Liu, Ta-Yung Yang
-
Patent number: 12199521Abstract: A synchronous full-bridge rectifier circuit includes: a first high-side transistor, a first low-side transistor, a second high-side transistor and a second low-side transistor which are configured to generate a DC power source from an AC power source, wherein the first high-side transistor and the first low-side transistor are coupled to a live wire of the AC power source, and the second high-side transistor and the second low-side transistor are coupled to a neutral wire of the AC power source; a first detection transistor, coupled to the live wire and configured to generate a first detection signal; and a second detection transistor, coupled to the neutral wire configured to generate a second detection signal; wherein the first low-side transistor is turned on after the body-diode of the first low-side transistor is turned on; the second low-side transistor is turned on after the body-diode of the second low-side transistor is turned on.Type: GrantFiled: June 14, 2022Date of Patent: January 14, 2025Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Ta-Yung Yang, Yu-Chang Chen
-
Patent number: 12184183Abstract: A flyback power converter includes: a first transistor switching a transformer for generating a primary switching current and an output voltage; and a second transistor generating a circulated current to achieve ZVS (zero voltage switching) of the first transistor; wherein the flyback power converter actively forces at least one switching cycle to be operated in a DCM (discontinuous conduction mode) operation when the primary switching current is determined to have been operating in a non-DCM operation for a predetermined number of switching cycles. The flyback power converter generates a demagnetized signal which emulates the demagnetized time of the transformer for controlling the second transistor during the non-DCM operation. The flyback power converter calibrates the demagnetized signal according to the demagnetized time during the actively fored DCM operation.Type: GrantFiled: February 16, 2022Date of Patent: December 31, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Ta-Yung Yang, Ying-Chieh Su, Yu-Chang Chen
-
Patent number: 12184168Abstract: 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.Type: GrantFiled: June 11, 2022Date of Patent: December 31, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuo-Chi Liu, Ta-Yung Yang, Chung-Lung Pai
-
Patent number: 12176811Abstract: A switched capacitor voltage converter circuit includes: a switched capacitor converter and a control circuit. The switched capacitor converter includes at least one resonant capacitor, switches and at least one inductor. The control circuit generates a pulse width modulation (PWM) signal according to a first voltage or a second voltage and generates a control signal according to the PWM signal and a zero current detection signal. The control signal controls the switched capacitor converter by operating the corresponding switches to switch electrical connection of the inductor, so as to convert the first voltage to the second voltage or convert the second voltage to the first voltage.Type: GrantFiled: April 13, 2023Date of Patent: December 24, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuo-Chi Liu, Ta-Yung Yang
-
Patent number: 12170483Abstract: A power supply system providing a power conversion function for a system circuit includes first, second and third convertor circuits respectively including plural switches and first, second and third inductors. The first and second convertor circuits are coupled to first and second power supplies respectively through first and second ports of the system circuit. A third power supply is coupled to a battery module and an internal load circuit. The plural switches are configured to correspondingly switch the first to third inductors to perform power conversion between the first to third power supplies and an internal power bus of the system circuit. The voltage of the internal power bus is configured to be higher than any voltage of the first to third power supplies, such that a current of the internal power bus is lower than a third current of the third power supply.Type: GrantFiled: May 22, 2023Date of Patent: December 17, 2024Assignee: Richtek Technology CorporationInventors: Sin-Sian Jheng, Jiun-Jang Lin
-
Patent number: 12160151Abstract: An electronic device for controlling an LRA (Linear Resonant Actuator) includes a signal generator, a driver, a delay unit, a sensor, and a DSP (Digital Signal Processor). The signal generator generates a digital signal. The driver drives the LRA according to the digital signal. The delay unit delays the digital signal for a predetermined time, so as to generate an estimated voltage signal. The sensor detects the current flowing through the LRA, so as to generate a sensing current signal. The DSP controls the resonant frequency or the gain value of the signal generator according to the estimated voltage signal and the sensing current signal.Type: GrantFiled: October 28, 2021Date of Patent: December 3, 2024Assignee: Richtek Technology CorporationInventors: Tsung-Han Yang, Yen-Chih Wang, Ming-Jun Hsiao, Tsung-Nan Wu
-
Patent number: 12153089Abstract: An electronic device is provided, which includes an oscillator, a controller, and a test circuit. The oscillator generates a clock signal according to an enable signal. The oscillator determines a period of the clock signal according to an adjustment signal. The controller generates the enable signal and generates a first test signal according to the clock signal. The controller determines the period according to a first comparison signal and a second comparison signal. The test circuit, through the first test signal, tests the period to generate the first comparison signal and the second comparison signal.Type: GrantFiled: February 7, 2023Date of Patent: November 26, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventor: Fu-Shiang Lai
-
Patent number: 12143002Abstract: A hybrid switching power converter is configured to perform power conversion between a first power, a second power, and a third power. The hybrid switching power converter includes a switched inductor conversion circuit and a switched capacitor conversion circuit, wherein the switched inductor conversion circuit is configured to perform the power conversion between the first power and the second power, and the switched capacitor conversion circuit is configured to perform the power conversion between the second power and the third power. The switched inductor conversion circuit includes a plurality of inductor switches, wherein the plural inductor switches include a first switch and a second switch. The switched capacitor conversion circuit includes a plurality of capacitor switches, wherein the plural capacitor switches include the first switch and the second switch.Type: GrantFiled: November 17, 2022Date of Patent: November 12, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Jiun-Jang Lin, Jhen-Yu Li
-
Patent number: 12143070Abstract: A parallel input and dynamic cascaded OTA (operational transconductance amplifier includes: plural sub-OTAs which generate corresponding plural transconductance output currents according to corresponding plural differential input voltages; and at least one cascading capacitor which is cascaded between a first sub-OTA and a second sub-OTA. A second transconductance output current generated by the second sub-OTA is coupled through the cascading capacitor to generate a transient bias current on a common mode bias node of the first sub-OTA, thus providing the transient bias current to a differential pair circuit of the first sub-OTA in a case when a transient variation occurs in the differential input voltage corresponding to the first sub-OTA, so that a loop bandwidth and a response speed during a transient state are enhanced.Type: GrantFiled: December 15, 2021Date of Patent: November 12, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventor: Min-Hung Hu
-
Patent number: 12136885Abstract: A resonant half-bridge flyback power converter includes: a first transistor and a second transistor which form a half-bridge circuit; a transformer and a resonant capacitor connected in series and coupled to the half-bridge circuit; and a switching control circuit configured to generate a first driving signal and a second driving signal to control the first transistor and the second transistor respectively for switching the transformer to generate an output voltage. The first driving signal is configured to magnetize the transformer. The second driving signal includes at most one pulse between two consecutive pulses of the first driving signal. The switching control circuit generates a skipping cycle period when an output power is lower than a predetermined threshold. A resonant pulse of the second driving signal is skipped during the skipping cycle period. The skipping cycle period is increased in response to the decrease of the output power.Type: GrantFiled: February 8, 2024Date of Patent: November 5, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Ta-Yung Yang, Ying-Chieh Su, Yu-Chang Chen
-
Patent number: 12136876Abstract: 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.Type: GrantFiled: December 13, 2022Date of Patent: November 5, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuo-Chi Liu, Ta-Yung Yang
-
Patent number: 12136878Abstract: A multi-stage amplifier circuit includes: a front stage amplification circuit, for generating a front stage amplification signal according to a difference between a primary reference signal and a primary feedback signal; an output adjustment circuit, for generating a driving signal according to the front stage amplification signal; and an output transistor, controlled by the driving signal to generate an output signal. The output adjustment circuit includes: an adjustment transistor biased by a differential current of the front stage amplification signal; and an impedance adjustment device biased by the differential current. A resistance of the impedance adjustment device is determined by a difference between an adjustment feedback signal and an adjustment reference signal. The driving signal is determined by a product of a resistance of the impedance adjustment device multiplied by the differential current of the front stage amplification signal, and a drain-source voltage of the adjustment transistor.Type: GrantFiled: September 21, 2022Date of Patent: November 5, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventor: Min-Hung Hu
-
Patent number: 12136875Abstract: 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.Type: GrantFiled: October 25, 2022Date of Patent: November 5, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Kuo-Chi Liu, Ta-Yung Yang
-
Patent number: 12136650Abstract: A high voltage device includes: a semiconductor layer, a well, a body region, a body contact, a gate, a source, and a drain. The body contact is configured as an electrical contact of the body region. The body contact and the source overlap with each other to define an overlap region. The body contact has a depth from an upper surface of the semiconductor layer, wherein the depth is deeper than a depth of the source, whereby a part of the body contact is located vertically below the overlap region. A length of the overlap region in a channel direction is not shorter than a predetermined length, so as to suppress a parasitic bipolar junction transistor from being turning on when the high voltage device operates, wherein the parasitic bipolar junction transistor is formed by a part of the well, a part of the body region and a part of the source.Type: GrantFiled: April 11, 2022Date of Patent: November 5, 2024Assignee: RICHTEK TECHNOLOGY CORPORATIONInventors: Chih-Wen Hsiung, Chun-Lung Chang, Kun-Huang Yu, Kuo-Chin Chiu, Wu-Te Weng