Patents by Inventor Aleksandar Radic
Aleksandar Radic has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11973428Abstract: A method involves determining that a power converter is in a discontinuous, no-load, or ultra-light load mode of operation. In response, a voltage amplitude of a feedback signal of the power converter rises towards a voltage amplitude that is greater than or equal to a first threshold voltage level. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to the first threshold voltage level, a first enabling pulse is issued to a primary side switch of the power converter to reduce a voltage amplitude of the feedback signal. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to a second threshold voltage level, a normal mode of operation of the power converter is entered.Type: GrantFiled: May 23, 2023Date of Patent: April 30, 2024Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11955894Abstract: A quasi-resonant auto-tuning controller includes a zero-voltage crossing detection circuit and a valley tuning finite-state machine having a look-up table. The zero-voltage crossing detection circuit receives a reference voltage and receives an auxiliary signal from an auxiliary winding. The zero-voltage crossing detection circuit produces a comparison signal having pulses when the auxiliary signal is less than the reference voltage. The valley tuning finite-state machine produces a divided pulse width based on the comparison signal, stores the divided pulse width of each pulse in the look-up table, determines, from the comparison signal, that the auxiliary signal is less than the reference voltage, waits a time period corresponding to the divided pulse width stored in the look-up table if the auxiliary signal is less than the reference voltage, and produces a valley point signal after waiting the time period.Type: GrantFiled: February 8, 2023Date of Patent: April 9, 2024Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11870350Abstract: A switched-mode power controller includes a primary side controller circuit configured in a startup mode of operation to generate a fixed switching frequency pulse width modulation (PWM) signal with incrementing duty-ratio value. The PWM signal drives a main-switch that charges an inductive device with stored energy and discharges the stored energy into a capacitor on a secondary side to generate a power controller output voltage. Based on a comparison of the power controller output voltage with a reference voltage, the primary side controller circuit is configured to stop the incrementing of the duty-ratio of the PWM signal and begin a quasi-resonant mode of operation during which the primary side controller circuit reduces a number of valleys detected in one or more off-times of the main-switch in one or more respective main-switch switching periods.Type: GrantFiled: February 15, 2022Date of Patent: January 9, 2024Assignee: Appulse Power Inc.Inventor: Aleksandar Radic
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Publication number: 20240007009Abstract: A power converter includes a transformer having a primary-side winding connected to a switch, and a controller connected to a gate node of the switch. The controller includes a switch timing and control module to generate switch control pulses, a gate driver to receive the switch control pulses and generate gate control pulses therefrom to control the switch, and a gate drive controller to provide a switch transition speed control signal to the gate driver to control a switch transition speed of the switch for each pulse of the gate control pulses. Based on an operating mode of the power converter, the gate drive controller is configured to set the switch transition speed of the gate driver to a first speed for generating an initial gate control pulse and to set the switch transition speed of the gate driver to a second speed for generating subsequent gate control pulses.Type: ApplicationFiled: September 19, 2023Publication date: January 4, 2024Applicant: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11804783Abstract: A power converter includes a transformer having a primary-side winding connected to a switch, and a controller connected to a gate node of the switch. The controller includes a switch timing and control module to generate switch control pulses, a gate driver to receive the switch control pulses and generate gate control pulses therefrom to control the switch, and a gate drive controller to provide a switch transition speed control signal to the gate driver to control a switch transition speed of the switch for each pulse of the gate control pulses. Based on an operating mode of the power converter, the gate drive controller is configured to set the switch transition speed of the gate driver to a first speed for generating an initial gate control pulse and to set the switch transition speed of the gate driver to a second speed for generating subsequent gate control pulses.Type: GrantFiled: February 1, 2022Date of Patent: October 31, 2023Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Publication number: 20230299683Abstract: A method involves determining that a power converter is in a discontinuous, no-load, or ultra-light load mode of operation. In response, a voltage amplitude of a feedback signal of the power converter rises towards a voltage amplitude that is greater than or equal to a first threshold voltage level. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to the first threshold voltage level, a first enabling pulse is issued to a primary side switch of the power converter to reduce a voltage amplitude of the feedback signal. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to a second threshold voltage level, a normal mode of operation of the power converter is entered.Type: ApplicationFiled: May 23, 2023Publication date: September 21, 2023Applicant: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Publication number: 20230268839Abstract: A power converter controller includes an analog to digital converter (ADC) to generate a digital representation of a feedback signal of a power converter, the feedback signal being received from a compensator of the power converter and being based on an output voltage of the power converter. A nonlinear gain block of the power converter controller receives the digital representation of the feedback signal and generates a transformed digital representation of the feedback signal using a nonlinear function. A switch control block of the power converter controller controls an on-time of a primary-side switch of the power converter based on the transformed digital representation of the feedback signal.Type: ApplicationFiled: April 28, 2023Publication date: August 24, 2023Applicant: Appulse Power Inc.Inventor: Aleksandar Radic
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Publication number: 20230246558Abstract: A power converter includes a transformer having a primary-side winding connected to a switch, and a controller connected to a gate node of the switch. The controller includes a switch timing and control module to generate switch control pulses, a gate driver to receive the switch control pulses and generate gate control pulses therefrom to control the switch, and a gate drive controller to provide a switch transition speed control signal to the gate driver to control a switch transition speed of the switch for each pulse of the gate control pulses. Based on an operating mode of the power converter, the gate drive controller is configured to set the switch transition speed of the gate driver to a first speed for generating an initial gate control pulse and to set the switch transition speed of the gate driver to a second speed for generating subsequent gate control pulses.Type: ApplicationFiled: February 1, 2022Publication date: August 3, 2023Applicant: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11699955Abstract: A method involves determining that a power converter is in a no-load or ultra-light load mode of operation. In response to determining that the power converter is in a no-load or ultra-light load mode of operation, a voltage amplitude of a feedback signal of the power converter is allowed to rise towards a voltage amplitude that is greater than or equal to a first threshold voltage level. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to the first threshold voltage level, a first sequence of enabling pulses are issued to a primary side switch of the power converter to reduce a voltage amplitude of the feedback signal. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to a second threshold voltage level, a normal mode of operation of the power converter is entered.Type: GrantFiled: June 14, 2022Date of Patent: July 11, 2023Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Publication number: 20230198413Abstract: The anti-windup circuit generally has a voltage clamping device in series with a current limiting device operatively connectable to the output current path of a feedback compensator; the feedback compensator being part of a switch-mode power supply (SMPS) having an input voltage source and a load and generating constrained control values required to generate control on-off actions for tight power regulation. The inclusion of the disclosed anti-windup circuit in an SMPS may lead to hardware based overvoltage protection, reduced overall size and faster response to load changes.Type: ApplicationFiled: February 15, 2023Publication date: June 22, 2023Applicant: Appulse Power Inc.Inventor: Aleksandar Radic
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Publication number: 20230188045Abstract: A quasi-resonant auto-tuning controller includes a zero-voltage crossing detection circuit and a valley tuning finite-state machine having a look-up table. The zero-voltage crossing detection circuit receives a reference voltage and receives an auxiliary signal from an auxiliary winding. The zero-voltage crossing detection circuit produces a comparison signal having pulses when the auxiliary signal is less than the reference voltage. The valley tuning finite-state machine produces a divided pulse width based on the comparison signal, stores the divided pulse width of each pulse in the look-up table, determines, from the comparison signal, that the auxiliary signal is less than the reference voltage, waits a time period corresponding to the divided pulse width stored in the look-up table if the auxiliary signal is less than the reference voltage, and produces a valley point signal after waiting the time period.Type: ApplicationFiled: February 8, 2023Publication date: June 15, 2023Applicant: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11677325Abstract: A power converter controller includes an analog to digital converter (ADC) to generate a digital representation of a feedback signal of a power converter, the feedback signal being received from a compensator of the power converter and being based on an output voltage of the power converter. A nonlinear gain block of the power converter controller receives the digital representation of the feedback signal and generates a transformed digital representation of the feedback signal using a nonlinear function. A switch control block of the power converter controller controls an on-time of a primary-side switch of the power converter based on the transformed digital representation of the feedback signal.Type: GrantFiled: October 27, 2022Date of Patent: June 13, 2023Assignee: Appulse Power Inc.Inventor: Aleksandar Radic
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Patent number: 11671026Abstract: A method involves receiving, at an active clamp controller circuit, an active clamp switch current that passes through an active clamp switch. The active clamp switch is enabled using the active clamp controller circuit in response to determining, based on the active clamp switch current, body-diode conduction of the active clamp switch. The active clamp switch is disabled using the active clamp controller circuit in response to determining, based on the active clamp switch current, a first zero-crossing of the active clamp switch current and a second zero-crossing of the active clamp switch current.Type: GrantFiled: August 16, 2021Date of Patent: June 6, 2023Assignee: Appulse Power Inc.Inventor: Aleksandar Radic
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Patent number: 11664736Abstract: An apparatus includes a high-pass filter circuit configured to receive a drain-source voltage from a drain node of a synchronous rectifier switch at a secondary-side of a power converter and to generate a filtered drain-source voltage using the received drain-source voltage. A current comparison circuit of the apparatus is configured to receive a current indicative of a current through the synchronous rectifier switch and to generate a current comparison signal using the received current. An auto-tuning controller of the apparatus is configured to turn the synchronous rectifier switch on upon determining a body diode conduction of the synchronous rectifier switch, commence an auto-tuned delay upon determining that the current through the synchronous rectifier switch has changed direction, turn the synchronous rectifier switch off upon expiration of the auto-tuned delay, and update, during a detection window of time, a duration of the auto-tuned delay based on the filtered drain-source voltage.Type: GrantFiled: September 24, 2021Date of Patent: May 30, 2023Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11621641Abstract: The anti-windup circuit generally has a voltage clamping device in series with a current limiting device operatively connectable to the output current path of a feedback compensator; the feedback compensator being part of a switch-mode power supply (SMPS) having an input voltage source and a load and generating constrained control values required to generate control on-off actions for tight power regulation. The inclusion of the disclosed anti-windup circuit in an SMPS may lead to hardware based overvoltage protection, reduced overall size and faster response to load changes.Type: GrantFiled: February 16, 2022Date of Patent: April 4, 2023Assignee: Appulse Power Inc.Inventor: Aleksandar Radic
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Patent number: 11606035Abstract: A quasi-resonant auto-tuning controller includes a zero-voltage crossing detection circuit and a valley tuning finite-state machine having a look-up table. The zero-voltage crossing detection circuit receives a reference voltage and receives an auxiliary signal from an auxiliary winding. The zero-voltage crossing detection circuit produces a comparison signal having pulses when the auxiliary signal is less than the reference voltage. The valley tuning finite-state machine produces a divided pulse width based on the comparison signal, stores the divided pulse width of each pulse in the look-up table, determines, from the comparison signal, that the auxiliary signal is less than the reference voltage, waits a time period corresponding to the divided pulse width stored in the look-up table if the auxiliary signal is less than the reference voltage, and produces a valley point signal after waiting the time period.Type: GrantFiled: May 16, 2022Date of Patent: March 14, 2023Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11606028Abstract: A single-mode quasi constant frequency controller apparatus for controlling output voltage deviation during one or more load transients, the controller apparatus comprising: a converter receiving one or more operational control parameters; a load tracking modulator configured to receive sensory inputs representative of a capacitor current polarity, and to control one or more power transistors of the converter such that an inductor current matches a load current cycle and reconstructs a desired inductor current ripple by splitting both an on-time for inductor charging and an off-time for inductor discharging into a current correction phase (CCP) and a ripple reconstruction phase (RRP), the load tracking modulator communicating the one or more operational control parameters for controlling the one or more power transistors.Type: GrantFiled: January 31, 2019Date of Patent: March 14, 2023Assignee: Würth Elektronik eiSos GmbH & Co. KGInventors: Aleksandar Prodic, Tom Moiannou, Aleksandar Radic, Alexander Gerfer, Mahmoud Shousha, Martin Haug
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Publication number: 20230076899Abstract: A power converter controller includes an analog to digital converter (ADC) to generate a digital representation of a feedback signal of a power converter, the feedback signal being received from a compensator of the power converter and being based on an output voltage of the power converter. A nonlinear gain block of the power converter controller receives the digital representation of the feedback signal and generates a transformed digital representation of the feedback signal using a nonlinear function. A switch control block of the power converter controller controls an on-time of a primary-side switch of the power converter based on the transformed digital representation of the feedback signal.Type: ApplicationFiled: October 27, 2022Publication date: March 9, 2023Applicant: Appulse Power Inc.Inventor: Aleksandar Radic
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Publication number: 20220407424Abstract: A method involves determining that a power converter is in a no-load or ultra-light load mode of operation. In response to determining that the power converter is in a no-load or ultra-light load mode of operation, a voltage amplitude of a feedback signal of the power converter is allowed to rise towards a voltage amplitude that is greater than or equal to a first threshold voltage level. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to the first threshold voltage level, a first sequence of enabling pulses are issued to a primary side switch of the power converter to reduce a voltage amplitude of the feedback signal. Upon determining that the voltage amplitude of the feedback signal is greater than or equal to a second threshold voltage level, a normal mode of operation of the power converter is entered.Type: ApplicationFiled: June 14, 2022Publication date: December 22, 2022Applicant: Silanna Asia Pte LtdInventor: Aleksandar Radic
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Patent number: 11522444Abstract: A method involves controlling, for a duration of a first modulation period, a first average off-time of a main switch of a power converter such that the first average off-time of the main switch corresponds to a first intermediate valley number of multiple intermediate valley numbers, an average of the intermediate valley numbers corresponding to a target number of valleys of a resonant waveform at a drain node of the main switch. A second intermediate valley number of the intermediate valley numbers is selected upon expiration of the first modulation period. A difference of the second intermediate valley number and the first intermediate valley number is equal to a fractional valley number offset. A second average off-time of the main switch is controlled for a duration of a second modulation period such that the second average off-time of the main switch corresponds to the second intermediate valley number.Type: GrantFiled: May 7, 2021Date of Patent: December 6, 2022Assignee: Silanna Asia Pte LtdInventor: Aleksandar Radic