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Richtek Technology Corp patents


Recent patent applications related to Richtek Technology Corp. Richtek Technology Corp is listed as an Agent/Assignee. Note: Richtek Technology Corp may have other listings under different names/spellings. We're not affiliated with Richtek Technology Corp, we're just tracking patents.

ARCHIVE: New 2018 2017 2016 2015 2014 2013 2012 2011 2010 2009 | Company Directory "R" | Richtek Technology Corp-related inventors


 new patent  Display apparatus with testing functions and driving circuit and driving method thereof

The present invention provides a display apparatus, including: a display panel circuit which includes a panel load line and performs a scanning display operation; and a panel driving circuit. The panel driving circuit determines at least a test phase and a scanning display phase according to a display control signal generated by a timing control circuit, wherein the test phase is a partial time period when the panel driving circuit does not perform the scanning display operation. ... Richtek Technology Corp

Power device

The invention provides a power device, which includes: an operation layer, including a top surface, a body region and a drift region, the body region and the drift region being connected in a lateral direction, to form a pn junction along a channel width direction between the body region and the drift region; a gate, formed on the top surface, and the pn junction is located under the gate; a source, formed in a portion of the operation layer between the body region and the top surface; a drain, formed in another portion of the operation layer between the drift region and the top surface; a first conduction portion, formed on the top surface for electrically connecting the source; a conduction layer, formed on the first conduction portion and electrically connected to the source via the first conduction portion; and a second conduction portion, formed on the top surface and between the conduction layer and the drift region in a thickness direction, for electrically connecting the drift region and the conduction layer, wherein a schottky diode is formed by the second conduction portion and the drift region.. . ... Richtek Technology Corp

Metal oxide semiconductor device having recess and manufacturing method thereof

The present invention provides a mos (metal-oxide-silicon) device and a manufacturing method thereof. The mos device includes: a semiconductor substrate, a gate, a source, a drain, and two ldds (lightly-doped-drains). ... Richtek Technology Corp

Metal oxide semiconductor device having mitigated threshold voltage roll-off and threshold voltage roll-off mitigation method thereof

The present invention provides a mos (metal-oxide-silicon) device having mitigated threshold voltage roll-off and a threshold voltage roll-off mitigation method therefor. The mos device includes: a substrate, a well region, an isolation region, a gate, two ldds (lightly-doped-drains), a source, a drain and a compensation doped region. ... Richtek Technology Corp

Power supply system and short circuit and/or bad connection detection method thereof, and power converter thereof

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. ... Richtek Technology Corp

Method for conrolling on time of power switch in power converter

A method for controlling a power switch of a power converter includes: detecting whether a zero current event occurs; generating an error signal; generating an ramp signal having a slope proportional to a ratio of an on time during which of the power switch is turned on in a previous switching cycle to a time length of the previous switching cycle; comparing the ramp signal with the error signal; turning on the power switch when the zero current event occurs; and turning off the power switch and rapidly lowering the level of the ramp signal when the ramp signal is greater than or equal to the error signal.. . ... Richtek Technology Corp

Bio-cell detection apparatus and bio detection method

The present invention provides a bio-cell detection apparatus and a bio detection method. The bio detection method includes: in absence of a biological reagent being introduced, pre-calibrating an initial value of a bio-cell detection chip. ... Richtek Technology Corp

Flyback power converter and synchronous rectification (sr) switch control circuit and power switch control circuit thereof

A flyback power converter includes a transformer, a power switch, a power switch control circuit, a synchronous rectification (sr) switch, an sr switch control circuit, and a signal coupler circuit. The signal coupler circuit includes a primary port and a secondary port, wherein the primary port is electrically connected to the power switch control circuit, and the secondary port is electrically connected to the sr switch control circuit. ... Richtek Technology Corp

Power switch control circuit and open detection method thereof

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. ... Richtek Technology Corp

Charger circuit and capacitive power conversion circuit and reverse blocking switch circuit thereof

A charger circuit for providing a charging current and voltage to a battery includes a power delivery unit, a capacitive power conversion circuit and a reverse blocking switch circuit. The power delivery unit converts an input power to a dc voltage and current. ... Richtek Technology Corp

Charger circuit and capacitive power conversion circuit and charging control method thereof

A charger circuit for providing a charging current and voltage to a battery includes a power delivery unit and a capacitive power conversion circuit. The power delivery unit converts an input power to a dc voltage and current. ... Richtek Technology Corp

Capacitive power conversion circuit and charging control method thereof

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. ... Richtek Technology Corp

Charging circuit and capacitive power conversion circuit and charging control method thereof

A charging circuit for providing a charging current to a battery includes a power delivery unit and a capacitive power conversion circuit. The power delivery unit converts an input power to a dc output voltage and current, and regulates the dc output current to a predetermined output current level. ... Richtek Technology Corp

Resonant wireless power transmitter circuit and control method thereof

The present invention provides a resonant wireless power transmitter circuit, including: a load circuit, a power conversion circuit which is coupled between an input power supply and the load circuit, and a phase detection and control circuit. The power conversion circuit includes plural power switches and a current sensing device. ... Richtek Technology Corp

01/04/18 / #20180004233

Fluid dispenser, fluid dispensation control device, and fluid dispensation abnormal status monitor

A fluid dispenser, includes: a fluid dispensation pipe, for receiving a fluid and controlling a dispensation the fluid; a mems sensor, for sensing a movement of the fluid dispenser, wherein when the movement is determined to be in an abnormal status, the mems sensor generates an alarm signal; and a dispensation stopper, for stopping the dispensation of the fluid according to the alarm signal.. . ... Richtek Technology Corp

12/21/17 / #20170366080

Voltage converter controller and voltage converter circuit

A voltage converter controller, adapted to a voltage converter circuit, includes a power switch controller and a dead-time determining circuit. The power switch controller receives a pwm signal and outputs a high-side control signal and a low-side control signal accordingly to control the conduction and cut-off of a high-side power switch and a low-side power switch respectively. ... Richtek Technology Corp

12/14/17 / #20170359055

Driving stage circuit

The present invention provides a driving stage circuit, including a driving switch circuit and a conduction resistance adjusting circuit. The driving switch circuit generates an output signal according to a switch control signal. ... Richtek Technology Corp

12/07/17 / #20170353102

Switching regulator capable of reducing current ripple and control circuit thereof

The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. ... Richtek Technology Corp

12/07/17 / #20170351281

Tunable dc voltage generating circuit

A tunable dc voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit arranged to operably rectify the resonance signal; a current control unit, coupled with an output of the rectifying circuit, and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor, coupled with the output of the rectifying circuit, arranged to operably provide a dc output signal having a voltage level greater than that of the input signal; and a control circuit arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the dc output signal.. . ... Richtek Technology Corp

11/30/17 / #20170343610

Method of estimating the state of charge of a battery and system thereof

The invention relates to a method for estimating the state of charge (soc) of a battery when battery is in the at least states of: charging, discharging, and relaxing. The invention makes use of the battery voltage (vbat) instead of the battery current. ... Richtek Technology Corp

11/23/17 / #20170338746

Power converter and secondary side controller and short circuit determination method for current sensing resistor of the power converter

The present invention provides a power converter, a secondary side controller, and a short circuit determination method for a current sensing resistor of the power converter. The power converter is controlled by a power switch to convert an input voltage to an output voltage, and provide an output current to an output terminal. ... Richtek Technology Corp

11/23/17 / #20170338663

Multi-load control apparatus and slave circuit and control method thereof

The present invention provides a multi-load control apparatus, a slave circuit and a control method thereof. The multi-load control apparatus includes a master circuit and at least one slave circuit. ... Richtek Technology Corp

11/16/17 / #20170331381

Switching regulator with pfc function and control circuit and control method thereof

The present invention provides a switching regulator with pfc function and a control circuit and a control method thereof. The switching regulator with pfc function includes a power stage circuit, a current sense circuit, and a control circuit. ... Richtek Technology Corp

11/16/17 / #20170328800

Combo micro-electro-mechanical system device and manufacturing method thereof

The invention provides a combo mems device. The combo mems device includes a substrate, a device layer, a cap, and at least two sensor units. ... Richtek Technology Corp

10/26/17 / #20170310136

Charging apparatus and charging control circuit and control method thereof

A charging apparatus includes a power conversion circuit for charging a battery, and a charging control circuit. The battery has a battery net voltage. ... Richtek Technology Corp

10/26/17 / #20170310129

Charging control method and charging system, power delivery unit, and power receiver control circuit using the method

The present invention provides a charging control method for controlling a power delivery unit to supply output power to a mobile unit, wherein the output power includes a dc output voltage and/or a dc output current. The method includes: receiving a power delivery configuration by the power delivery unit, wherein the power delivery configuration at least defines at least one execution time period and plural voltage(s) and/or current(s); the power delivery unit regulates the dc output voltage and/or dc output current according to the power delivery configuration during the at least one execution time period such that the dc output voltage and/or dc output current correspond to the power delivery configuration.. ... Richtek Technology Corp

10/26/17 / #20170310122

Charging apparatus and charging control circuit thereof and charging control method

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. ... Richtek Technology Corp

09/07/17 / #20170257920

Light emitting device current regulator circuit and control method thereof

Alight emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. ... Richtek Technology Corp

08/17/17 / #20170237353

Method for conrolling on time of power switch in power converter

A method for controlling a power switch of a power converter includes: detecting whether a zero current event occurs; generating an error signal; generating an adjusted voltage by multiplying a setting voltage by a ratio of an on time during which of the power switch is turned on in a previous switching cycle to a time length of the previous switching cycle; performing a low-pass filtering operation on the adjusted voltage to generate a filtered signal; providing a transconductance amplifier for converting the filtered signal into a ramp signal; turning on the power switch when the zero current event occurs; and turning off the power switch and rapidly lowering the level of the ramp signal when the ramp signal is greater than or equal to the error signal.. . ... Richtek Technology Corp

08/17/17 / #20170237341

Tunable dc voltage generating circuit

A tunable dc voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor coupled in a series connection, and arranged to operably receive an input signal and to operably generate a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit coupled with the output node and arranged to operably rectify the resonance signal; a current control unit coupled with an input of the rectifying circuit and coupled with the inductor or the input capacitor in a parallel connection; a stabilizing capacitor coupled with an output of the rectifying circuit and arranged to operably provide a dc output signal having a voltage level greater than that of the input signal; and a control circuit arranged to operably adjust a current passing through the current control unit according to a setting signal to thereby manipulate the dc output signal.. . ... Richtek Technology Corp

08/10/17 / #20170227974

Tunable dc voltage generating circuit

A tunable dc voltage generating circuit includes: a resonance circuit including an inductor and an input capacitor connected in series configuration, and arranged to operably receive an input signal and generating a resonance signal at an output node between the inductor and the input capacitor; a rectifying circuit coupled with the output node and arranged to operably rectify the resonance signal; a current control unit connected with the resonance circuit in series configuration; a stabilizing capacitor coupled with an output terminal of the rectifying circuit and arranged to operably provide a dc output signal having a voltage level greater than that of the input signal; and a control circuit coupled with the output terminal of the rectifying circuit and the current control unit, and arranged to operably adjust a current passing through the current control unit to thereby change the dc output signal.. . ... Richtek Technology Corp

08/03/17 / #20170222566

Ac-to-dc power converter and related control circuits

An ac-to-dc power converter includes a rectifier for generating a rectified voltage based on an ac voltage; an input capacitor coupled between the rectifier and a fixed-voltage terminal; a first inductive element; a first auxiliary capacitor; a first switch coupled between the input capacitor and the first inductive element; a second switch coupled between the first inductive element and the fixed-voltage terminal; a circuitry node; an auxiliary switch for coupling between the circuitry node and the first auxiliary capacitor or between the first auxiliary capacitor and the fixed-voltage terminal; a first diode; a second diode; a control signal generating circuit for controlling the first switch and the second switch; and an auxiliary switch control circuit for controlling the auxiliary switch.. . ... Richtek Technology Corp

08/03/17 / #20170221440

Display apparatus with testing functions and driving circuit and driving method thereof

The present invention provides a display apparatus, including: a display panel circuit which includes a panel load line and performs a scanning display operation; and a panel driving circuit. The panel driving circuit determines at least a test phase and a scanning display phase according to a display control signal generated by a timing control circuit, wherein the test phase is a partial time period when the panel driving circuit does not perform the scanning display operation. ... Richtek Technology Corp

07/13/17 / #20170201178

Dual-constant-time buck-boost switching regulator and control circuit and method thereof

The present invention provides a dual constant time buck-boost switching regulator, and a control circuit and a method thereof. The buck-boost switching regulator converts an input voltage to an output voltage and it includes a buck circuit and a boost circuit. ... Richtek Technology Corp

07/13/17 / #20170201107

Adaptive buck converter and charging cable using the same

An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a dc voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by the mobile device from the connection terminal; a power converting circuit for receiving the dc voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the dc voltage while the charging current is greater than the cable current; and a data processing circuit coupled with the power converting circuit and configured for controlling the power converting circuit according to the communication signal.. . ... Richtek Technology Corp

07/13/17 / #20170201101

Mobile device charger for charging mobile device and related adaptive charging voltage generator

An adaptive charging voltage generator of a mobile device charger includes: a power receiving interface for receiving a dc voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the mobile device charger and for receiving a communication signal generated by the mobile device from the connection terminal; a buck converter for receiving the dc voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the dc voltage while the charging current is greater than the cable current; and a charging voltage control circuit coupled with the buck converter and configured for controlling the buck converter according to the communication signal.. . ... Richtek Technology Corp

07/06/17 / #20170196055

Light emitting device driver circuit and driving method of light emitting device circuit

A light emitting device circuit has one or plural light emitting devices connected in series. A light emitting device driver circuit drives the light emitting device circuit according to a rectified input voltage. ... Richtek Technology Corp

06/29/17 / #20170188424

Driving circuit for driving a led array

A control chip of a driving circuit for driving a led array shares a ground terminal with the led array so that, without an additional winding, the driving circuit can provide a supply voltage for the control chip, implement a zero-current switching function, and implement an over-voltage protection function. Since no additional windings are needed, the related costs and the size of the driving circuit are decreased.. ... Richtek Technology Corp

06/22/17 / #20170179834

Power converter and switch control module therein

A power converter includes: a transformer having a primary side winding to receive a rectified voltage, and a secondary side winding to generate an output dc voltage; a gallium nitride (gan) m0sfet, coupled to the primary side winding for controlling a primary side current flowing through the primary side winding; a sensing resistor coupled to the gan transistor switch, for sensing the primary side current to generate a current sensing signal; and a switch control unit, for controlling the gan transistor switch according to the current sensing signal. The sensing resistor and the gan transistor switch are connected at a ground node having a voltage level which is the ground of the primary side.. ... Richtek Technology Corp

06/08/17 / #20170163162

Flyback power converter with programmable output and control circuit and control method thereof

The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. ... Richtek Technology Corp

05/04/17 / #20170122974

Micro-electro-mechanical system device

A mems device includes: a substrate; a proof mass suspended over the substrate, the proof mass including at least one proof mass body and a proof mass frame connected to and accommodating the proof mass body, the proof mass frame including at least one self-test frame; and at least one self-test electrode inside the self-test frame, and connected to the substrate; wherein when a voltage difference is applied between the self-test electrode and the self-test frame, the proof mass is driven to have an in-plane movement, and wherein the self-test electrode and the self-test frame do not form a sensing capacitor in between.. . ... Richtek Technology Corp

04/20/17 / #20170110575

High-side power device and manufacturing method thereof

A high-side device includes: a substrate, an epitaxial layer, a high voltage well, a body region, a gate, a source, a drain, and a buried region. A channel junction is formed between the body region and the high voltage well. ... Richtek Technology Corp

04/20/17 / #20170108916

Event detection method for waking up a portable electronic device and action sensor using same

The present invention discloses an event detection method for waking up a portable electronic device and an action sensor using same. The event detection method includes the steps of: under a normal operation mode, sensing action events by the action sensor with a first data sensing frequency, wherein the action sensor operates by a normal current to detect the action events; entering into a sleep mode; under the sleep mode, detecting a wake-up event by the action sensor with a second data sensing frequency, wherein the action sensor operates by a weak current to detect the wake-up event, wherein the weak current is smaller than the normal current, and the second data sensing frequency is not higher than the first data sensing frequency; and returning to the normal operation mode when the wake-up event is detected.. ... Richtek Technology Corp

04/13/17 / #20170104412

Control circuit of power converter and related method

A control circuit includes: a comparing circuit, having a first input terminal and second input terminal, configured to operably generate a comparison signal according signals received by the first and second input terminals, wherein the first input terminal is utilized for coupling with a reference signal and the second input terminal is utilized for coupling with a feedback signal; a periodic signal generating circuit configured to operably generate a periodic signal and apply the periodic signal to the first input terminal or the second input terminal of the comparing circuit; and a control signal generating circuit for controlling an on time of a power switch according to the comparison signal. The periodic signal generating circuit clamps a limit of the periodic signal to a predetermined value, but does not configure the slope of the periodic signal to be zero when there is no current passing through the inductor.. ... Richtek Technology Corp

03/23/17 / #20170085131

Resonant wireless power transmitter circuit and control circuit and control method thereof

The present invention discloses a resonant wireless power transmitter circuit, which has an input impedance. The resonant wireless power transmitter circuit includes: a driver circuit coupled with a power supply, which includes at least a power switch; a switching resonant control circuit coupled with the driver circuit, such that the driver operates at a pre-determined or a variable resonant frequency; an adjustable impedance matching circuit coupled with the driver circuit, which includes at least a varactor; a transmitter circuit coupled with the impedance matching circuit and the driver circuit, which includes at least a transmitter coil; and an impedance control circuit coupled with the adjustable impedance matching circuit and the driver circuit, which provides an impedance control signal to control the reactance of the varactor, such that the input impedance of the resonant wireless power transmitter circuit is matched at the pre-determined or the variable resonant frequency.. ... Richtek Technology Corp

02/23/17 / #20170054019

Lateral double diffused metal oxide semiconductor device and manufacturing method thereof

A lateral double diffused metal oxide semiconductor device, includes: a p-type substrate, an epitaxial layer, a p-type high voltage well, a p-type body region, an n-type well, an isolation oxide region, a drift oxide region, a gate, an n-type contact region, a p-type contact region, a top source, a bottom source, and an n-type drain. The p-type body region is between and connects the p-type high voltage well and the surface of the epitaxial layer. ... Richtek Technology Corp

02/02/17 / #20170030741

Micro-electro-mechanical system device with electrical compensation and readout circuit thereof

A mems device includes: a fixed structure, a movable structure, and a compensation circuit. The fixed structure includes a fixed electrode and a fixed compensation electrode. ... Richtek Technology Corp

01/19/17 / #20170019026

Enhanced phase control circuit and method for a multiphase power converter

A multiphase power converter has a plurality of phase circuits, each of which provides a phase current when being active. During single-phase operation of the multiphase power converter, an enhanced phase control circuit and method monitor the summation of the phase currents, and when the summation becomes higher than a threshold, switch the multiphase power converter to a higher power zone to increase the number of active phases. ... Richtek Technology Corp

01/05/17 / #20170005647

Frequency jittering control circuit and method for a pfm power supply

A frequency jittering control circuit for a pfm power supply includes a pulse frequency modulator to generate a frequency jittering control signal to switch a power switch to generate an output voltage. The frequency jittering control circuit jitters an input signal or an on-time or off-time of the pulse frequency modulator to jitter the switching frequency of the power switch to thereby improve emi issue.. ... Richtek Technology Corp

01/05/17 / #20170005579

Control circuit and method of a power converter

A feedback signal stabilized by a capacitor and related to an output voltage of a power converter is used to acquire the output power information of the power converter, and a control circuit uses a second clock not related to the switching frequency of the power converter to count a duration time of the feedback signal being higher than a threshold. When the duration time is higher than a preset time, an abnormal output power of the power converter is distinguished and the power converter will be turned off. ... Richtek Technology Corp








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