Patents by Inventor Milovan KOVACEVIC
Milovan KOVACEVIC 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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Publication number: 20230283194Abstract: Control techniques and circuits for resonant power converters and other power converters are described. Control of power converters based on more than one control parameter can provide improved efficiency over a wide operating range. A resonant power converter may have its switching frequency controlled within a narrow band to improve efficiency.Type: ApplicationFiled: October 17, 2022Publication date: September 7, 2023Inventors: Anthony Sagneri, Victor Sinow, Ranko Sredojevic, Milovan Kovacevic
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Publication number: 20220021308Abstract: Control techniques and circuits for resonant power converters and other power converters are described. Control of power converters based on more than one control parameter can provide improved efficiency over a wide operating range. A resonant power converter may have its switching frequency controlled within a narrow band to improve efficiency.Type: ApplicationFiled: February 26, 2021Publication date: January 20, 2022Inventors: Anthony Sagneri, Victor Sinow, Ranko Sredojevic, Milovan Kovacevic
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Publication number: 20210266750Abstract: A user authentication system that analyzes call forwarding information obtained from telecommunication networks, such as through the use of Signaling System No. 7 (“SS7”) protocols, to detect the possibility of fraud. In response to a request to access a network-accessible service, the system performs an initial authentication of provided user account credentials. The system then obtains a telecommunication subscriber identifier that is associated with the user account. Prior to performing additional device-based user authentication, the system obtains call forwarding information for the user. The obtained call forwarding information is then evaluated for potentially fraudulent call forwarding configurations. For example, call forwarding to certain call forwarding numbers, or the use of different call forwarding types, may be indicative of fraud intended to undermine further user authentication.Type: ApplicationFiled: February 16, 2021Publication date: August 26, 2021Inventors: Stacy Lyn Stubblefield, Vladimir Vujovic, Milovan Kovacevic
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Patent number: 10924922Abstract: A user authentication system that analyzes call forwarding information obtained from telecommunication networks, such as through the use of Signaling System No. 7 (“SS7”) protocols, to detect the possibility of fraud. In response to a request to access a network-accessible service, the system performs an initial authentication of provided user account credentials. The system then obtains a telecommunication subscriber identifier that is associated with the user account. Prior to performing additional device-based user authentication, the system obtains call forwarding information for the user. The obtained call forwarding information is then evaluated for potentially fraudulent call forwarding configurations. For example, call forwarding to certain call forwarding numbers, or the use of different call forwarding types, may be indicative of fraud intended to undermine further user authentication.Type: GrantFiled: November 22, 2019Date of Patent: February 16, 2021Assignee: TeleSign CorporationInventors: Stacy Lyn Stubblefield, Vladimir Vujovic, Milovan Kovacevic
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Publication number: 20200366208Abstract: Control techniques and circuits for resonant power converters and other power converters are described. Control of power converters based on more than one control parameter can provide improved efficiency over a wide operating range. A resonant power converter may have its switching frequency controlled within a narrow band to improve efficiency.Type: ApplicationFiled: December 12, 2019Publication date: November 19, 2020Inventors: Anthony Sagneri, Victor Sinow, Ranko Sredojevic, Milovan Kovacevic
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Publication number: 20200092724Abstract: A user authentication system that analyzes call forwarding information obtained from telecommunication networks, such as through the use of Signaling System No. 7 (“SS7”) protocols, to detect the possibility of fraud. In response to a request to access a network-accessible service, the system performs an initial authentication of provided user account credentials. The system then obtains a telecommunication subscriber identifier that is associated with the user account. Prior to performing additional device-based user authentication, the system obtains call forwarding information for the user. The obtained call forwarding information is then evaluated for potentially fraudulent call forwarding configurations. For example, call forwarding to certain call forwarding numbers, or the use of different call forwarding types, may be indicative of fraud intended to undermine further user authentication.Type: ApplicationFiled: November 22, 2019Publication date: March 19, 2020Inventors: Stacy Lyn Stubblefield, Vladimir Vujovic, Milovan Kovacevic
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Patent number: 10492070Abstract: A user authentication system that analyzes call forwarding information obtained from telecommunication networks, such as through the use of Signaling System No. 7 (“SS7”) protocols, to detect the possibility of fraud. In response to a request to access a network-accessible service, the system performs an initial authentication of provided user account credentials. The system then obtains a telecommunication subscriber identifier that is associated with the user account. Prior to performing additional device-based user authentication, the system obtains call forwarding information for the user. The obtained call forwarding information is then evaluated for potentially fraudulent call forwarding configurations. For example, call forwarding to certain call forwarding numbers, or the use of different call forwarding types, may be indicative of fraud intended to undermine further user authentication.Type: GrantFiled: October 18, 2017Date of Patent: November 26, 2019Assignee: TeleSign CorporationInventors: Stacy Lyn Stubblefield, Vladimir Vujovic, Milovan Kovacevic
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Patent number: 10418901Abstract: The present invention relates to a new method of power converter regulation, in particular regulation of very high frequency (VHF) power converters operating at frequencies in the MHz range, wherein accurate output regulation utilizes inherent delays in the regulation loop, whereby, contrary to hysteresis on/off control, the new method does not require immediate responses to comparisons of a sense voltage to two reference voltages; rather, according to the new method, only one reference voltage is used, and delays in the feedback loop are allowed to cause some variation of an output of the power converter.Type: GrantFiled: February 26, 2015Date of Patent: September 17, 2019Assignee: Danmarks Tekniske UniversitetInventors: Milovan Kovacevic, Mickey P. Madsen
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Patent number: 10340805Abstract: The present invention relates to a resonant step-down DC-DC power converter which comprises a primary side circuit and a secondary side circuit coupled through a galvanic isolation barrier. The primary side circuit comprises a positive and a negative input terminal for receipt of an input voltage and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. A resonant network is con-figured for alternatingly being charged from the input voltage and discharged to the output capacitor through the galvanic isolation barrier by a semiconductor switch arrangement in accordance with a switch control signal to produce the converter output voltage.Type: GrantFiled: January 20, 2015Date of Patent: July 2, 2019Assignee: Danmarks Tekniske UniversitetInventors: Milovan Kovacevic, Mickey P. Madsen
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Publication number: 20190116495Abstract: A user authentication system that analyzes call forwarding information obtained from telecommunication networks, such as through the use of Signaling System No. 7 (“SS7”) protocols, to detect the possibility of fraud. In response to a request to access a network-accessible service, the system performs an initial authentication of provided user account credentials. The system then obtains a telecommunication subscriber identifier that is associated with the user account. Prior to performing additional device-based user authentication, the system obtains call forwarding information for the user. The obtained call forwarding information is then evaluated for potentially fraudulent call forwarding configurations. For example, call forwarding to certain call forwarding numbers, or the use of different call forwarding types, may be indicative of fraud intended to undermine further user authentication.Type: ApplicationFiled: October 18, 2017Publication date: April 18, 2019Inventors: Stacy Lyn Stubblefield, Vladimir Vujovic, Milovan Kovacevic
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Patent number: 10181798Abstract: A step-up DC-DC power converter comprises a primary side circuit and a secondary side circuit coupled through a galvanic isolation barrier. The primary side circuit comprises a positive and a negative input terminal for receipt of an input voltage and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. The galvanic isolation barrier comprises a first capacitor coupled in series with the positive input terminal of the primary side circuit and the first positive electrode of the output capacitor; and a second capacitor coupled in series with the negative input terminal of the primary side circuit and the second negative electrode of the output capacitor.Type: GrantFiled: December 17, 2014Date of Patent: January 15, 2019Assignee: Danmarks Tekniske UniversitetInventors: Milovan Kovacevic, Mickey P. Madsen
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Publication number: 20180309368Abstract: Control techniques and circuits for resonant power converters and other power converters are described. Control of power converters based on more than one control parameter can provide improved efficiency over a wide operating range. A resonant power converter may have its switching frequency controlled within a narrow band to improve efficiency.Type: ApplicationFiled: April 26, 2018Publication date: October 25, 2018Inventors: Anthony Sagneri, Victor Sinow, Ranko Sredojevic, Milovan Kovacevic
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Patent number: 9991805Abstract: The present invention relates to a resonant DC-DC power converter comprising an input side circuit comprising a positive and a negative input terminal for receipt of an input voltage or current and an output side circuit comprising positive and negative output terminals for supply of a converter output voltage and connection to a converter load. The resonant DC-DC power converter further comprises a rectification circuit connected between an output of a resonant network and the output side circuit. The resonant network is configured for alternatingly being charged from the input voltage or current and discharged through the rectification circuit by a first controllable switch arrangement in accordance with a first switch control signal.Type: GrantFiled: February 26, 2015Date of Patent: June 5, 2018Assignee: Danmarks Tekniske UniversitetInventors: Mickey P. Madsen, Milovan Kovacevic
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Publication number: 20170019031Abstract: Control techniques and circuits for resonant power converters and other power converters are described. Control of power converters based on more than one control parameter can provide improved efficiency over a wide operating range. A resonant power converter may have its switching frequency controlled within a narrow band to improve efficiency.Type: ApplicationFiled: September 20, 2016Publication date: January 19, 2017Inventors: Anthony Sagneri, Victor Sinow, Ranko Sredojevic, Milovan Kovacevic
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Publication number: 20170019014Abstract: A method and controller for controlling a power converter having a plurality of stacked power cells. A method includes controlling the plurality of stacked power cells using a common mode control parameter as well as a differential mode control parameter that controls a voltage of a connection terminal between respective power cells of the plurality of stacked power cells.Type: ApplicationFiled: September 20, 2016Publication date: January 19, 2017Inventors: Anthony Sagneri, Victor Sinow, Ranko Sredojevic, Milovan Kovacevic
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Publication number: 20160365795Abstract: The present invention relates to a resonant DC-DC power converter comprising an input side circuit comprising a positive and a negative input terminal for receipt of an input voltage or current and an output side circuit comprising positive and negative output terminals for supply of a converter output voltage and connection to a converter load. The resonant DC-DC power converter further comprises a rectification circuit connected between an output of a resonant network and the output side circuit. The resonant network is configured for alternatingly being charged from the input voltage or current and discharged through the rectification circuit by a first controllable switch arrangement in accordance with a first switch control signal.Type: ApplicationFiled: February 26, 2015Publication date: December 15, 2016Inventors: Mickey P. Madsen, Milovan Kovacevic
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Publication number: 20160359412Abstract: The present invention relates to a new method of power converter regulation, in particular regulation of very high frequency (VHF) power converters operating at frequencies in the MHz range, wherein accurate output regulation utilises inherent delays in the regulation loop, whereby, contrary to hysteresis on/off control, the new method does not require immediate responses to comparisons of a sense voltage to two reference voltages; rather, according to the new method, only one reference voltage is used, and delays in the feedback loop are allowed to cause some variation of an output of the power converter.Type: ApplicationFiled: February 26, 2015Publication date: December 8, 2016Inventors: Milovan Kovacevic, Mickey P. Madsen
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Publication number: 20160322910Abstract: The present invention relates to a resonant step-down DC-DC power converter which comprises a primary side circuit and a secondary side circuit coupled through a galvanic isolation barrier. The primary side circuit comprises a positive and a negative input terminal for receipt of an input voltage and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. A resonant network is con-figured for alternatingly being charged from the input voltage and discharged to the output capacitor through the galvanic isolation barrier by a semiconductor switch arrangement in accordance with a switch control signal to produce the converter output voltage.Type: ApplicationFiled: January 20, 2015Publication date: November 3, 2016Inventors: Milovan Kovacevic, Mickey P. Madsen
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Publication number: 20160315545Abstract: The present invention relates to a step-up DC-DC power converter which comprises a primary side circuit and a secondary side circuit coupled through a galvanic isolation barrier. The primary side circuit comprises a positive and a negative input terminal for receipt of an input voltage and an input capacitor coupled between the positive and negative input terminals and the secondary side circuit comprises an output capacitor chargeable to a converter output voltage between a first positive electrode and a second negative electrode. A switched energy storage network is configured for alternatingly being charged from the input voltage and discharged to the output capacitor through the galvanic isolation barrier in accordance with a switch control signal to produce the converter output voltage.Type: ApplicationFiled: December 17, 2014Publication date: October 27, 2016Inventors: Milovan KOVACEVIC, Mickey P. MADSEN