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公开(公告)号：US11843344B2
公开(公告)日：2023-12-12
申请号：US17511631
申请日：2021-10-27
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang
Abstract: A brushless DC electric (BLDC) motor driver circuit includes: a power stage circuit configured to operably drive a brushless DC electric (BLDC) motor according to a pulse width modulation (PWM) signal; and an abnormality diagnosis circuit, wherein when a first parameter is under control, the abnormality diagnosis circuit is configured to operably determine a rotation abnormality condition of the BLDC motor according to a second parameter; wherein the first parameter and the second parameter are correlated with the rotation of the BLDC motor.
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52.发明公开公开(公告)号：US20230396162A1
公开(公告)日：2023-12-07
申请号：US18312512
申请日：2023-05-04
Applicant: Richtek Technology Corporation
Inventor： Kuo-Chi Liu , Ta-Yung Yang , Wei-Hsu Chang
CPC classification number: H02M3/07 , H02M1/0009
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.
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公开(公告)号：US20230268825A1
公开(公告)日：2023-08-24
申请号：US18156453
申请日：2023-01-19
Applicant: Richtek Technology Corporation
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Shih-Ho Hsu , Mao-Hui Kuo
CPC classification number: H02M1/42 , H02M1/08 , H02M3/33571 , H02M3/33573
Abstract: A power supply system includes a power factor correction converter circuit and an isolated power converter circuit, wherein the power factor correction converter circuit corrects the power factor of a rectified power to generate a first output power, and the isolated power converter circuit converts the first output power to generate a second output power. The isolated power converter circuit includes a transformer, and the transformer includes a primary winding, a secondary winding, and an auxiliary winding. The auxiliary winding generates an auxiliary voltage which is related to the second output power. When the auxiliary voltage is lower than a disabled threshold, indicating that the voltage of the second output power is lower than a threshold, the power factor correction converter circuit provides a bypassing connection from the rectified power to the first output power and stops correcting the power factor of the rectified power.
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公开(公告)号：US20220407336A1
公开(公告)日：2022-12-22
申请号：US17829394
申请日：2022-06-01
Applicant: Richtek Technology Corporation
Inventor： Wei-Hsu Chang , Ta-Yung Yang
Abstract: A charging control method includes: converting an input power to a DC power; receiving the DC power by a detachable cable to generate a bus power; converting the bus power to a charging power for charging a battery in a charging period; and adjusting the DC power and/or the charging power to track a maximum of a power conversion efficiency; wherein the power conversion efficiency includes one of the following: an input power conversion efficiency, which is a conversion efficiency of converting the input power to the charging power; a DC power conversion efficiency, which is a conversion efficiency of converting the DC power to the charging power; or a bus power conversion efficiency, which is a conversion efficiency of converting the bus power to the charging power.
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公开(公告)号：US20210384838A1
公开(公告)日：2021-12-09
申请号：US17245043
申请日：2021-04-30
Applicant: Richtek Technology Corporation
Inventor： Wei-Hsu Chang , Kun-Yu Lin , Tzu-Chen Lin , Ta-Yung Yang
Abstract: A flyback power converter circuit includes a transformer, a blocking switch, a primary side switch, a primary side controller circuit and a secondary side controller circuit. The transformer is coupled between an input voltage and an internal output voltage in an isolated manner. The blocking switch controls the electric connection between the internal output voltage and an external output voltage. In a standby mode, the internal output voltage is regulated to a standby voltage, and the blocking switch is controlled to be OFF; in an operation mode, the internal output voltage is regulated to an operating voltage, and the blocking switch is controlled to be ON, such that the external output voltage has the operating voltage. The standby voltage is smaller than the operating voltage, so that the power consumption of the flyback power converter circuit is reduced in the standby mode.
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Patent Agency Ranking
56.发明申请公开(公告)号：US20210376734A1
公开(公告)日：2021-12-02
申请号：US17334745
申请日：2021-05-30
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 power transformer, a primary side switch and a conversion control circuit. In a DCM, during a dead time, the conversion control circuit calculates an upper limit frequency corresponding to output current according to a frequency upper limit function, and obtains a frequency upper limit masking period according to a reciprocal of the upper limit frequency, wherein the frequency upper limit masking period is a period starting from when the primary side switch is turned ON. During an upper limit selection period, the conversion control circuit selects a valley among one or more valleys in a ringing signal related to a voltage across the primary side switch as an upper limit locked valley, so that the conversion control circuit once again turns ON the primary side switch at a beginning time point of the upper limit locked valley.
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公开(公告)号：US11139742B2
公开(公告)日：2021-10-05
申请号：US16879692
申请日：2020-05-20
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Yu-Chang Chen , Chao-Chi Chen , Chuh-Ching Li , Li-Di Lo , Hao-Wen Chung
Abstract: A switching controller circuit for controlling a flyback power converter includes: a power transformer, a primary side controller circuit and a secondary side controller circuit. The power transformer is coupled between the input voltage and the output voltage in an isolated manner. The primary side controller circuit controls a primary side switch of the flyback power converter. The secondary side controller circuit generates a synchronous rectification (SR) signal, to control an SR switch of the flyback power converter. The SR signal includes an SR pulse and a soft switching (SS) pulse. The SR pulse controls the SR switch to be ON for an SR period, to achieve synchronous rectification at the secondary side. The SS pulse controls the SR switch to be ON for an SS period, to achieve soft switching of the primary side switch.
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公开(公告)号：US20200153327A1
公开(公告)日：2020-05-14
申请号：US16586916
申请日：2019-09-28
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Tzu-Chen Lin , Kun-Yu Lin , Li-Di Lo , Wei-Hsu Chang
Abstract: A ZVS (zero voltage switching) control circuit for controlling a flyback power converter includes: a primary side controller circuit for generating a switching signal, to control a primary side switch; and a secondary side controller circuit for generating a synchronous rectifier (SR) control signal for controlling a synchronous rectifier switch. The SR control signal includes an SR-control pulse and a ZVS pulse. The SR-control pulse controls the synchronous rectifier switch to perform secondary side synchronous rectification. The secondary side controller circuit determines a trigger timing point of the ZVS pulse according to a waveform characteristic of a ringing signal, to control the synchronous rectifier switch to be ON for a predetermined period, thereby achieving zero voltage switching of the primary side switch. The primary side or the secondary side controller circuit includes a jitter controller for performing jitter control on the ZVS pulse.
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公开(公告)号：US10601238B2
公开(公告)日：2020-03-24
申请号：US15390511
申请日：2016-12-25
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Wei-Hsu Chang , Ta-Yung Yang , Chih-Yuan Hsu
IPC: H02J7/00
Abstract: The present invention provides a charging apparatus, a charging control circuit, and a charging control method. The charging apparatus includes a power conversion circuit for generating a DC output voltage and charging a battery by a DC output current, and a charging control circuit for controlling the power conversion circuit. When the DC output voltage or the battery voltage rises to a first reference threshold voltage, the DC output current is adjusted downward by a current down step, and when the DC output voltage or the battery voltage falls to a second reference threshold voltage, the DC output current is adjusted upward by a current up step.
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60.发明申请公开(公告)号：US20180301975A1
公开(公告)日：2018-10-18
申请号：US15892724
申请日：2018-02-09
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Kun-Yu Lin , Tzu-Chen Lin , Wei-Hsu Chang , Ta-Yung Yang
CPC classification number: H02M1/083 , H02M1/088 , H02M3/33569 , H02M2001/0009 , H02M2001/0058
Abstract: A flyback power converter circuit includes: a transformer including a primary side winding coupled to an input power and a secondary side winding coupled to an output node, wherein the input power includes an input voltage; a primary side switch coupled to the primary side winding for controlling the input power to generate an output power on the output node through the secondary side winding, wherein the output power includes an output voltage; a clamping circuit including an auxiliary switch and an auxiliary capacitor connected in series to form an auxiliary branch which is connected with the primary side winding in parallel; and a conversion control circuit for adjusting an ON time of the auxiliary switch according to at least one of a current related signal, the input voltage, and the output voltage, such that the primary side switch is zero voltage switching when turning ON.
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