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71.发明申请公开(公告)号：US20190341770A1
公开(公告)日：2019-11-07
申请号：US16354129
申请日：2019-03-14
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Shung-Tsung Chen , Yi-Syue Jhu , Chieh-Min Lo , Tsung-Han Tsai
Abstract: A power supply system includes a power supplier circuit and a power receiver circuit. The power supplier circuit supplies a power via a communication interface compatible with a first communication interface specification or a second communication interface specification. The first communication interface specification includes a delay threshold. After the power supplier circuit is coupled to the power receiver circuit, the power supplier circuit supplies the power after a first delay period. The power receiver circuit confirms whether the power supplier circuit is coupled to the power receiver circuit via a coupling confirmation step according to the first communication interface specification. The power receiver circuit confirms whether the power supplier circuit is compatible with the first communication interface specification or the second communication interface specification according to whether the first delay period is greater than the delay threshold.
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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：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.
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公开(公告)号：US20190227018A9
公开(公告)日：2019-07-25
申请号：US15495136
申请日：2017-04-24
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yu-Lin Yang , Chun-Hao Chang , Min-Da Wu , Hung-Der Su , Da-Hong Qian
CPC classification number: G01N27/22 , B01L3/502 , B01L3/508 , B01L2200/12 , B01L2300/0627 , B01L2300/0645 , B01L2300/0663 , B01L2300/0887 , B01L2300/161 , G01N27/226
Abstract: The invention provides a bio-detection device, including a carrier, a plurality of spacers, an electronic circuit, and a package layer, wherein an open platform is formed. The carrier includes a test region and a signal transmission wiring, wherein the test region is configured to carry a fluid under test. The spacers are located on the test region and electrically connected to two different voltage levels to form a capacitor for sensing a capacitance of the fluid. The spacers are connected to the signal transmission wiring. The electronic circuit receives and processes a sensing signal corresponding to the capacitance of the fluid. The package layer covers a portion of the carrier but does not cover the test region. The open platform is formed whereby a user can easily put in the fluid. The open platform has a bottom which includes the test region, and an area of the open platform is defined by the spacers and the package layer.
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Patent Agency Ranking
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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77.发明申请公开(公告)号：US20190159310A1
公开(公告)日：2019-05-23
申请号：US16160789
申请日：2018-10-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Meng-Hsun Yang , Chi-Hsiu Lin , Wei-Ming Chiu
Abstract: A light emitting device driver apparatus includes: an inductor; a power switch which switches the inductor to convert an input power to an output current for driving a light emitting device circuit; and a conversion control circuit. When a dimming signal exceeds a first dimming threshold, a reference current signal is generated according to the dimming signal, and a switch control signal controls the power switch according to a first PWM signal, such that the output current corresponds to the level of the dimming signal. When the dimming signal does not exceed the first dimming threshold, the reference current signal is clamped to a level corresponding to the first dimming threshold, and a second PWM signal is generated according to the dimming signal, wherein the second PWM signal enables the first PWM signal to generate the switch control signal to control the power switch.
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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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公开(公告)号：US10181785B2
公开(公告)日：2019-01-15
申请号：US15874733
申请日：2018-01-18
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yi-Min Shiu , Isaac Y. Chen
Abstract: The present invention discloses a short circuit and/or bad connection detection method for use in a power supply system. The power supply system includes a power converter which converts an input voltage to an output voltage and supplies an output current to an electronic device. In the short circuit detection method, the conversion from the input voltage to the output voltage is disabled in a disable time period, and whether a short circuit occurs is determined according to the decreasing speed of the output voltage. In the bad connection detection method, an actual voltage and an actual current received by the electronic device are compared with the output voltage and the output current, to determine whether a bad connection occurs.
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公开(公告)号：US10181744B2
公开(公告)日：2019-01-15
申请号：US15602605
申请日：2017-05-23
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Tsung-Wei Huang
Abstract: A capacitive power converter circuit converts a DC power from a bus node to a charging power for charging a battery in a charging mode, and converts a battery voltage to a supply voltage through the bus node in a supply mode. The capacitive power converter circuit includes a conversion switch circuit including plural conversion switches configured to be operably coupled to one or more conversion capacitors, and a conversion control circuit for controlling the plural conversion switches. In the charging mode, the plural conversion switches control the conversion capacitors such that the charging current is scaled-up, and in the supply mode, the plural conversion switches control the conversion capacitors such that the supply voltage is scaled-up.
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