Patents by Inventor Mladen Ivankovic
Mladen Ivankovic 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: 9912241Abstract: In some embodiments, a power system includes an integrated circuit (IC). The IC includes a first switching transistor having a load path coupled between a sensing terminal of the IC and a first terminal of the IC. The first terminal of the IC is configured to be coupled to a first load path terminal of a second switching transistor. The IC also includes a first diode coupled between the first terminal of the IC and a second terminal of the IC. The second terminal is configured to be coupled to an auxiliary winding of the power system. The IC further includes a first driver circuit having an output coupled to a third terminal of the IC. The third terminal is configured to be coupled to a control node of the second switching transistor.Type: GrantFiled: February 3, 2016Date of Patent: March 6, 2018Assignee: INFINEON TECHNOLOGIES AUSTRIA AGInventors: Mladen Ivankovic, Xiaowu Gong, Fred Sawyer
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Patent number: 9906136Abstract: An embodiment method for designing a power converter system includes receiving, by a processor, power converter design parameters. The design parameters include a minimum DC input voltage Vmin and a maximum DC input voltage Vmax, a minimum switching frequency fmin and a maximum switching frequency fmax of a switching bridge of the power converter, and a target output voltage and a target output power. The method also includes calculating, by the processor, a first power converter configuration. The first power converter configuration includes a calculated magnetizing inductance Lmc equal to Re tan(?)(2?fmin)?1, where ? is a load angle complement equal to a sin(VminVmax?1), and Re is an equivalent reflected load resistance of the power converter. The first power converter configuration also includes a calculated resonant inductance Lrc equal to Lmc cos2(?)(fmax2fmin?2?1)?1 and a calculated resonant capacitance Crc equal to Lrc?1(2?fmax)?2.Type: GrantFiled: January 6, 2015Date of Patent: February 27, 2018Assignee: INFINEON TECHNOLOGIES AUSTRIA AGInventors: Mladen Ivankovic, Fred Sawyer
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Publication number: 20170222643Abstract: In accordance with an embodiment, a circuit includes a first and a second switching transistors configured to be coupled in series between a first reference voltage terminal and a transformer. The circuit also includes a first diode coupled between a first drain of the first switching transistor and a first input terminal. The first diode is configured to clamp a voltage of the first drain to a voltage of the first input terminal. The circuit further includes a switching circuit coupled between the second switching transistor and the first input terminal. The switching circuit is configured to connect a second source of the second switching transistor to a second gate of the second switching transistor when a voltage of the second source exceeds the voltage of the first input terminal.Type: ApplicationFiled: January 28, 2016Publication date: August 3, 2017Inventors: Mladen Ivankovic, Fred Sawyer
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Publication number: 20170222561Abstract: In some embodiments, a power system includes an integrated circuit (IC). The IC includes a first switching transistor having a load path coupled between a sensing terminal of the IC and a first terminal of the IC. The first terminal of the IC is configured to be coupled to a first load path terminal of a second switching transistor. The IC also includes a first diode coupled between the first terminal of the IC and a second terminal of the IC. The second terminal is configured to be coupled to an auxiliary winding of the power system. The IC further includes a first driver circuit having an output coupled to a third terminal of the IC. The third terminal is configured to be coupled to a control node of the second switching transistor.Type: ApplicationFiled: February 3, 2016Publication date: August 3, 2017Inventors: Mladen Ivankovic, Gong Xiao Wu, Fred Sawyer
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Patent number: 9722599Abstract: In accordance with an embodiment, a circuit includes a first and a second switching transistors configured to be coupled in series between a first reference voltage terminal and a transformer. The circuit also includes a first diode coupled between a first drain of the first switching transistor and a first input terminal. The first diode is configured to clamp a voltage of the first drain to a voltage of the first input terminal. The circuit further includes a switching circuit coupled between the second switching transistor and the first input terminal. The switching circuit is configured to connect a second source of the second switching transistor to a second gate of the second switching transistor when a voltage of the second source exceeds the voltage of the first input terminal.Type: GrantFiled: January 28, 2016Date of Patent: August 1, 2017Assignee: INFINEON TECHNOLOGIES AUSTRIA AGInventors: Mladen Ivankovic, Fred Sawyer
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Publication number: 20160197556Abstract: An embodiment method for designing a power converter system includes receiving, by a processor, power converter design parameters. The design parameters include a minimum DC input voltage Vmin and a maximum DC input voltage Vmax, a minimum switching frequency fmin and a maximum switching frequency fmax of a switching bridge of the power converter, and a target output voltage and a target output power. The method also includes calculating, by the processor, a first power converter configuration. The first power converter configuration includes a calculated magnetizing inductance Lmc equal to Re tan(?)(2?fmin)?1, where ? is a load angle complement equal to a sin(VminVmax?1), and Re is an equivalent reflected load resistance of the power converter. The first power converter configuration also includes a calculated resonant inductance Lrc equal to Lmc cos2(?)(fmax2fmin?2?1)?1 and a calculated resonant capacitance Crc equal to Lrc?1(2?fmax)?2.Type: ApplicationFiled: January 6, 2015Publication date: July 7, 2016Inventors: Mladen Ivankovic, Fred Sawyer
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Patent number: 9293998Abstract: A two-transistor flyback converter includes a transformer having a primary side and a secondary side, a first transistor connected between an input voltage source and a first terminal of the primary side, a second transistor connected between ground and a second terminal of the primary side, and a diode directly connected between the first terminal of the primary side and ground. The first and second transistors are operable to switch on and off simultaneously and with no current return from the primary side to the input voltage source when the input voltage source is less than a reflected voltage from the secondary side.Type: GrantFiled: November 30, 2012Date of Patent: March 22, 2016Assignee: Infineon Technologies Austria AGInventors: Mladen Ivankovic, Fred Sawyer
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Patent number: 9281813Abstract: A circuit includes a transformer having a first winding and a second winding, an input connected to a first terminal of the first winding, a first power transistor and a second power transistor. The first power transistor has a source, a gate, and a drain connected to a second terminal of the first winding. The second power transistor has a source connected to ground, a gate connected to a pulsed voltage drive source and a drain connected to the source of the first power transistor. The gate of the first power transistor is connected to a DC source or the same pulsed voltage drive source as the gate of the second power transistor. The first power transistor actively turns off independent of load current. Other circuit embodiments and corresponding load switching methods are also provided.Type: GrantFiled: January 8, 2014Date of Patent: March 8, 2016Assignee: Infineon Technologies AGInventor: Mladen Ivankovic
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Patent number: 8907581Abstract: An LED driver includes a transformer, current control loop and current adjustment circuit. The primary side of the transformer transfers energy to the secondary side of the transformer responsive to an input signal. The secondary side delivers output current to one or more LEDs at a magnitude corresponding to the amount of energy transferred to the secondary side. The current control loop controls current in the primary side so that the output current equals a reference current signal. The current adjustment circuit injects a current adjustment signal into the current control loop responsive to a phase-cut signal which removes a portion of the input signal. The current control loop also decreases the current in the primary side responsive to the current adjustment signal so that a brightness of each LED connected to the secondary side is decreased by an amount corresponding to the magnitude of the current adjustment signal.Type: GrantFiled: December 17, 2012Date of Patent: December 9, 2014Assignee: Infineon Technologies Austria AGInventors: Mladen Ivankovic, Fred Sawyer
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Patent number: 8779841Abstract: A cascode switch includes a first power transistor configured to be coupled to a load and a second power transistor coupled in series with the first power transistor so that the second power transistor is between ground and the first power transistor. The second power transistor is operable to switch on and off responsive to a pulse source coupled to a gate of the second power transistor. The first power transistor is operable to switch on and off responsive to the same pulse source as the second power transistor or a DC source coupled to a gate of the first power transistor. Alternatively or in addition, a transistor device is coupled to the gate of the first power transistor and operable to actively turn off the first power transistor independent of the load current.Type: GrantFiled: January 31, 2012Date of Patent: July 15, 2014Assignee: Infineon Technologies Austria AGInventor: Mladen Ivankovic
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Publication number: 20140167634Abstract: An LED driver includes a transformer, current control loop and current adjustment circuit. The primary side of the transformer transfers energy to the secondary side of the transformer responsive to an input signal. The secondary side delivers output current to one or more LEDs at a magnitude corresponding to the amount of energy transferred to the secondary side. The current control loop controls current in the primary side so that the output current equals a reference current signal. The current adjustment circuit injects a current adjustment signal into the current control loop responsive to a phase-cut signal which removes a portion of the input signal. The current control loop also decreases the current in the primary side responsive to the current adjustment signal so that a brightness of each LED connected to the secondary side is decreased by an amount corresponding to the magnitude of the current adjustment signal.Type: ApplicationFiled: December 17, 2012Publication date: June 19, 2014Applicant: INFINEON TECHNOLOGIES NORTH AMERICA CORP.Inventors: Mladen Ivankovic, Fred Sawyer
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Publication number: 20140153295Abstract: A two-transistor flyback converter includes a transformer having a primary side and a secondary side, a first transistor connected between an input voltage source and a first terminal of the primary side, a second transistor connected between ground and a second terminal of the primary side, and a diode directly connected between the first terminal of the primary side and ground. The first and second transistors are operable to switch on and off simultaneously and with no current return from the primary side to the input voltage source when the input voltage source is less than a reflected voltage from the secondary side.Type: ApplicationFiled: November 30, 2012Publication date: June 5, 2014Applicant: Infineon Technologies North America Corp.Inventors: Mladen Ivankovic, Fred Sawyer
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Publication number: 20140118057Abstract: A circuit includes a transformer having a first winding and a second winding, an input connected to a first terminal of the first winding, a first power transistor and a second power transistor. The first power transistor has a source, a gate, and a drain connected to a second terminal of the first winding. The second power transistor has a source connected to ground, a gate connected to a pulsed voltage drive source and a drain connected to the source of the first power transistor. The gate of the first power transistor is connected to a DC source or the same pulsed voltage drive source as the gate of the second power transistor. The first power transistor actively turns off independent of load current. Other circuit embodiments and corresponding load switching methods are also provided.Type: ApplicationFiled: January 8, 2014Publication date: May 1, 2014Applicant: Infineon Technologies Austria AGInventor: Mladen Ivankovic
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Patent number: 8653881Abstract: A circuit includes a high-side switch, a low-side switch, a diode, a transformer having a primary winding and a secondary windowing, and an input connected to a first terminal of the primary winding. The high-side switch has a source, a gate connected to a drive source and a drain connected to a second terminal of the primary winding. The low-side switch has a source connected to ground, a gate connected to a drive source and a drain connected to the source of the high-side switch. The diode is connected between the gate of the high-side switch and the first terminal of the primary winding. The diode forms a current loop with the primary winding and the high-side switch to circulate current when low side switch is off until the high side switch turns off.Type: GrantFiled: March 30, 2012Date of Patent: February 18, 2014Assignee: Infineon Technologies Austria AGInventor: Mladen Ivankovic
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Publication number: 20130194027Abstract: A cascode switch includes a first power transistor configured to be coupled to a load and a second power transistor coupled in series with the first power transistor so that the second power transistor is between ground and the first power transistor. The second power transistor is operable to switch on and off responsive to a pulse source coupled to a gate of the second power transistor. The first power transistor is operable to switch on and off responsive to the same pulse source as the second power transistor or a DC source coupled to a gate of the first power transistor. Alternatively or in addition, a transistor device is coupled to the gate of the first power transistor and operable to actively turn off the first power transistor independent of the load current.Type: ApplicationFiled: January 31, 2012Publication date: August 1, 2013Applicant: INFINEON TECHNOLOGIES NORTH AMERICA CORP.Inventor: Mladen Ivankovic
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Publication number: 20130194026Abstract: A circuit includes a high-side switch, a low-side switch, a diode, a transformer having a primary winding and a secondary windowing, and an input connected to a first terminal of the primary winding. The high-side switch has a source, a gate connected to a drive source and a drain connected to a second terminal of the primary winding. The low-side switch has a source connected to ground, a gate connected to a drive source and a drain connected to the source of the high-side switch. The diode is connected between the gate of the high-side switch and the first terminal of the primary winding. The diode forms a current loop with the primary winding and the high-side switch to circulate current when low side switch is off until the high side switch turns off.Type: ApplicationFiled: March 30, 2012Publication date: August 1, 2013Applicant: INFINEON TECHNOLOGIES NORTH AMERICA CORP.Inventor: Mladen Ivankovic
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Patent number: 7542251Abstract: A linear power controller system may be implemented that includes locked-rotor protection circuitry that is primarily assembled using analog circuit components. The locked rotor protection circuitry may be part of a power module in the system. The power module may be a switched power source that includes temperature circuit. A control loop may be established in the system to maintain the voltage across a motor that is driver by the power module. Circuitry for establishing a close loop with a motor may be positioned in a control head in the system or in a power module in the system. Temperature protection circuitry may be integrated into a current source in the power module to provide automatic thermal shutdown of the current source. The linear power module may specifically include analog circuitry that is arranged to establish a control loop with the motor.Type: GrantFiled: May 9, 2003Date of Patent: June 2, 2009Assignee: Carter Group, Inc.Inventor: Mladen Ivankovic
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Patent number: 7265506Abstract: A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for controlling the speed of the motor and for adjusting or compensating for noise and other characteristics having a negative impact on performance. The circuitry is configured to have a crossover frequency that is below the motor noise frequency. The configuration of the crossover frequency may allow for the motor or the controller to be implemented without additional circuitry to filter or compensate for motor noise.Type: GrantFiled: May 7, 2004Date of Patent: September 4, 2007Inventor: Mladen Ivankovic
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Publication number: 20050264253Abstract: The present invention includes a reliable, configurable, compact, and low-cost linear electric motor controller for a vehicular heating ventilating and air conditioning (HVAC) system and methods of control. The controller features multiple input interfaces, specifically an interface for pulse width modulation control; an interface for discrete, stepwise control; and an interface for continuous variable control. The controller is implemented on an application-specific integrated circuit, and voltage to the electric motor is varied by a power metal-oxide semiconductor field-effect transistor (MOSFET).Type: ApplicationFiled: October 20, 2004Publication date: December 1, 2005Inventor: Mladen Ivankovic
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Publication number: 20050134205Abstract: A linear power controller and related circuitry may be implemented to provide linear control of a variable DC electric motor. The controller and motor are coupled to form a closed loop for controlling the speed of the motor and for adjusting or compensating for noise and other characteristics having a negative impact on performance. The circuitry is configured to have a crossover frequency that is below the motor noise frequency. The configuration of the crossover frequency may allow for the motor or the controller to be implemented without additional circuitry to filter or compensate for motor noise.Type: ApplicationFiled: May 7, 2004Publication date: June 23, 2005Inventor: Mladen Ivankovic