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公开(公告)号：US20220060116A1
公开(公告)日：2022-02-24
申请号：US17367568
申请日：2021-07-05
Applicant: Richtek Technology Corporation
Inventor： Hsin-Yi Wu , Chien-Fu Tang
IPC: H02M3/335 , H01L29/78 , G01R19/00 , H03K17/082
Abstract: A power path switch circuit includes: a power transistor unit including: a first vertical double-diffused metal oxide semiconductor (VDMOS) device, wherein a first current outflow end of the first VDMOS device is coupled to an output end of a power path; and a second VDMOS device, wherein a first current inflow end of the first VDMOS device and a second current inflow end of the second VDMOS device are coupled with a supply end of the power path; and a voltage locking circuit coupled to the first current outflow end and the second current outflow end, for locking a voltage at the second current outflow end to a voltage at the first current outflow end, so that there is a predetermined ratio between a first conductive current flowing through the first VDMOS device and a second conductive current flowing through the second VDMOS device.
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公开(公告)号：US20210270870A1
公开(公告)日：2021-09-02
申请号：US17115662
申请日：2020-12-08
Applicant: Richtek Technology Corporation
Inventor： Isaac Y. Chen , Chien-Fu Tang , Hsin-Yi Wu , Kai-Chuan Chan , Yu-Lin Yang
Abstract: A current sensing circuit having self-calibration includes two leads, a sensing element having a sensing resistance, and a sensing and calibration circuit. The sensing and calibration circuit senses and calibrates a sensing voltage of the sensing element, and senses a sensing current through the sensing element according to the sensing resistance and the sensing voltage, to generate a current sensing output signal. The sensing and calibration circuit includes two pads, a V2I circuit, a current mirror circuit and an I2V circuit. The sensing element has a first temperature coefficient (TC). The TC and/or the resistance of an adjusting resistor in the V2I circuit and an adjusting resistor in the I2V circuit are determined according to the first TC, such that the TC of the current sensing output signal is equal to 0.
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公开(公告)号：US20210167691A1
公开(公告)日：2021-06-03
申请号：US16926726
申请日：2020-07-12
Applicant: Richtek Technology Corporation
Inventor： Isaac Y. Chen , Chien-Fu Tang , Jo-Yu Wang
Abstract: A low delay time power converter circuit includes a driver circuit and a load. The driver circuit generates a switching driving signal to control the load. The driver circuit includes a switching control circuit and an output stage circuit which includes a first power switch, a second power switch and an impedance adjusting circuit. When the switching control circuit controls the switching driving signal to a first voltage level at a first time point, the first power switch is turned ON and then is turned OFF after a predetermined period. When the switching control circuit controls the switching driving signal to a second voltage level at a second time point, the second power switch is turned ON. The time point when the first power switch is turned OFF is earlier than the second time point. A resistance of the impedance adjusting circuit is larger than a conductive resistance of the first power switch.
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14.发明申请公开(公告)号：US20200099307A1
公开(公告)日：2020-03-26
申请号：US16541293
申请日：2019-08-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Li-Di Lo , Chien-Fu Tang , Isaac Y. Chen
Abstract: Whether a synchronous signal includes a synchronous pulse is determined by detecting whether there is a positive pulse higher than a positive threshold followed by a negative pulse lower than a negative threshold. The pulse signal detection method includes: comparing the synchronous signal with the positive threshold; comparing the synchronous signal with the negative threshold; and determining that the synchronous pulse exists when the positive pulse of the synchronous signal is higher than the positive threshold and the negative pulse of the synchronous signal is lower than the negative threshold in a post detection period after the positive pulse of the synchronous signal is determined higher than the positive threshold.
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公开(公告)号：US20160327968A1
公开(公告)日：2016-11-10
申请号：US15201473
申请日：2016-07-03
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: A mixed mode compensation circuit for a power converter generate a digital signal according to a reference signal and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit.
Abstract translation: 用于功率转换器的混合模式补偿电路根据参考信号和与功率转换器的输出电压相关的反馈信号产生数字信号，将数字信号转换为第一模拟信号，将第一模拟信号与 可变偏移值，用于产生第二模拟信号，并且滤除第二模拟信号的高频分量以产生用于稳定的功率转换器的输出电压的第三模拟信号。 混合模式补偿不需要大电容器，因此电路可以集成到集成电路中。
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Patent Agency Ranking
16.发明授权公开(公告)号：US08823424B1
公开(公告)日：2014-09-02
申请号：US14285038
申请日：2014-05-22
Applicant: Richtek Technology Corporation
Inventor： Pei-Kai Tseng , Chien-Fu Tang , Issac Y. Chen
CPC classification number: H03K3/013 , H03K19/00361 , H03K19/018507 , H03L5/00
Abstract: A floating gate driver uses a single-end level shifter to translate a set signal and a reset signal induced by a rising edge and a falling edge of a switch signal to a common output terminal to generate an output voltage for a bistable circuit to generate a level shifted switch signal. Under control of a well transient detect signal asserted by detecting noise in the output voltage, a masking circuit between the single-end level shifter and the bistable circuit masks noise in the output voltage. This configuration has lower area penalty and better noise immunity.
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公开(公告)号：US10461652B2
公开(公告)日：2019-10-29
申请号：US16132367
申请日：2018-09-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jo-Yu Wang , Isaac Y. Chen
Abstract: A flyback power converter includes: a transformer, a power switch, a switch control unit, a synchronous rectifier switch and a secondary side control circuit. The secondary side control circuit includes: a switch signal generation circuit and a first power conversion circuit. The secondary side control circuit is coupled to the synchronous rectifier switch and the secondary winding of the transformer. The switch signal generation circuit generates the synchronous rectifier switch signal selectively according to a first power or a second power, to control the synchronous rectifier switch. The first power is related to the output voltage. The first power conversion circuit generates the second power according to a secondary phase signal on a phase node between the secondary winding of the transformer and the synchronous rectifier switch.
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公开(公告)号：US10461624B2
公开(公告)日：2019-10-29
申请号：US15485226
申请日：2017-04-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Sheng Tsu , Chien-Fu Tang , Isaac Y. Chen
Abstract: The present invention provides a power switch control circuit and an open detection method thereof. The power switch control circuit is for generating an operation signal at an operation signal output pin according to an input signal, wherein the operation signal is for operating a power switch. The power switch control circuit includes: a current injection circuit, which is connected to the operation signal output pin, and provides a predetermined current to the operation signal output pin according to an enable signal; and an open detection circuit, which is coupled to the current injection circuit, and determines whether a connection between the operation signal output pin and the power switch is open according to a level of the operation signal output pin at a detection time point or according to a level variation of the operation signal output pin during a detection time period, whereby an open detection signal is generated.
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公开(公告)号：US10326351B2
公开(公告)日：2019-06-18
申请号：US16123135
申请日：2018-09-06
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Li-Di Lo , Isaac Y. Chen , Chien-Fu Tang
Abstract: A switching regulator includes: a controller power ON reset (POR) circuit, a controller post-POR signal generation circuit, and a pulse width modulation (PWM) signal generation circuit. The controller post-POR signal generation circuit switches the controller post-POR signal to a ready level after a controller pre-POR signal is switched to a controller reset-accomplished level and a driver signal starts switching levels to operate a power switch. The PWM signal generation circuit sets a duty ratio of a PWM signal to a predetermined minimum duty ratio after the controller pre-POR signal is switched to the controller reset-accomplished level and before the controller post-POR signal is switched to a ready level.
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公开(公告)号：US20190140534A1
公开(公告)日：2019-05-09
申请号：US16123135
申请日：2018-09-06
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Li-Di Lo , Isaac Y. Chen , Chien-Fu Tang
Abstract: A switching regulator includes: a controller power ON reset (POR) circuit, a controller post-POR signal generation circuit, and a pulse width modulation (PWM) signal generation circuit. The controller post-POR signal generation circuit switches the controller post-POR signal to a ready level after a controller pre-POR signal is switched to a controller reset-accomplished level and a driver signal starts switching levels to operate a power switch. The PWM signal generation circuit sets a duty ratio of a PWM signal to a predetermined minimum duty ratio after the controller pre-POR signal is switched to the controller reset-accomplished level and before the controller post-POR signal is switched to a ready level.
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