Patents by Inventor Dilip Sangam
Dilip Sangam 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: 9814109Abstract: The present invention discloses apparatus and techniques for modular backlighting control of a display. The display includes a number of strings of LEDs. The display is divided into several sections, and each section includes one or more strings of LEDs. A local controller is assigned to each section. The local controller receives feedback signals from the strings of LEDs in its sections and controls the drive voltages and drive currents of those strings. The local controllers communicate with each other and also with the main system controller.Type: GrantFiled: November 19, 2007Date of Patent: November 7, 2017Assignee: Atmel CorporationInventors: Tushar Heramb Dhayagude, Dilip Sangam, Hendrik Santo, Anjan Sen
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Patent number: 9622307Abstract: The present invention discloses apparatus and techniques for modular backlighting control of a display. The display includes a number of strings of LEDs. The display is divided into several sections, and each section includes one or more strings of LEDs. A local controller is assigned to each section. The local controller receives feedback signals from the strings of LEDs in its sections and controls the drive voltages and drive currents of those strings. The local controllers communicate with each other and also with the main system controller.Type: GrantFiled: March 21, 2012Date of Patent: April 11, 2017Assignee: Atmel CorporationInventors: Tushar Heramb Dhayagude, Dilip Sangam, Hendrik Santo, Anjan Sen
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Patent number: 9318959Abstract: A controller circuit for the control of a power converter is disclosed. An example controller circuit generates a waveform that drives a switch that controls the power converter. The controller circuit includes a divider module that generates a modification factor based on a ratio of the two input signals of the module. The circuit includes a module that generates a first waveform configured for a critical conducting mode of operation of a power converter and an on-time adjuster module that modifies the first waveform based on the modification factor and generates a second waveform. The second waveform is delivered to the switch. An example modification factor is the ratio of the output voltage to the rectified input voltage of the power converter.Type: GrantFiled: January 31, 2013Date of Patent: April 19, 2016Assignee: Atmel CorporationInventors: Hong Zhang, Sean S. Chen, Dilip Sangam
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Patent number: 9306446Abstract: A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events.Type: GrantFiled: December 7, 2012Date of Patent: April 5, 2016Assignee: Atmel CorporationInventors: Hong Zhang, Sean Chen, Dilip Sangam, Wenbo Liang
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Patent number: 9088219Abstract: A dual-mode circuit for the control of an AC/DC power converter is disclosed. An example dual-mode controller circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a critical conducting mode (CrM) module as well as a discontinuous conducting mode (DCM) module configured to generate waveforms adapted for CrM and DCM operation of a power converter. The circuit includes a node for receiving a feedback signal of a voltage or a current. Based on the received signal, one of the modules is selected at a time to supply the waveform at the output of the dual-mode controller. An example of the output waveform is a series of pulses that are configured to drive the switch that controls the transfer of power between input and output of the power converter.Type: GrantFiled: November 30, 2012Date of Patent: July 21, 2015Assignee: Atmel CorporationInventors: Hong Zhang, Sean S. Chen, Dilip Sangam
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Patent number: 9064461Abstract: System(s) and method(s) are provided for power management in an electronic display via compensation of a power source of a light-emitting-diode (LED) backlighting system. A compensation feedback loop includes a load-aware controller that receives the bad condition from a dimming controller and supplies a control signal to the power source. An efficiency regulator functionally connected the backlight circuitry closes the compensation, feedback loop and provides an input signal to the load-aware controller. The dimming controller implements phase-shifted pulse-modulation dimming, which based on duty cycle can establish a dimming equilibrium with two load conditions. The load aware controller includes a set of compensation blocks arranged in parallel, with a single compensation block connected to the input signal and that provides the control signal.Type: GrantFiled: November 11, 2013Date of Patent: June 23, 2015Assignee: Atmel CorporationInventors: Zhiyu Yang, Kien Vi, Dilip Sangam, Tushar Dhayagude
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Patent number: 8917231Abstract: System(s) and method(s) are provided for regulation of gamma characteristic of a display having solid-state-based backlight illumination. Regulation of the gamma characteristic can be accomplished at least in part through synchronization of data writing to a set of pixels in a display within a video frame with backlight illumination of a region of the display during a predetermined period, wherein the region is spanned by the set of pixels. Collection of data indicative of illumination intensity of light to be emitted in a region of a backlight source of the display during the predetermined period enables determination of at least one gamma value and at least one gamma reference voltage related to the at least one gamma value. Application of the at least one gamma reference voltage to the set of pixels adjusts the gamma characteristic thereof within the video frame.Type: GrantFiled: December 17, 2010Date of Patent: December 23, 2014Assignee: Atmel CorporationInventors: Kevin Hempson, Dilip Sangam
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Publication number: 20140253090Abstract: An integrated circuit is operable for implementing any of multiple switched mode or linear power control topologies. The integrated circuit includes a control unit, and functional blocks each of which includes circuitry. The control unit is operable selectively to enable particular ones of the functional blocks in response to an input signal indicative of a particular one of the switched mode or linear mode power control topologies.Type: ApplicationFiled: March 5, 2013Publication date: September 11, 2014Applicant: ATMEL CORPORATIONInventors: Dilip Sangam, Wai-Keung Peter Cheng
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Publication number: 20140211518Abstract: A controller circuit for the control of a power converter is disclosed. An example controller circuit generates a waveform that drives a switch that controls the power converter. The controller circuit includes a divider module that generates a modification factor based on a ratio of the two input signals of the module. The circuit includes a module that generates a first waveform configured for a critical conducting mode of operation of a power converter and an on-time adjuster module that modifies the first waveform based on the modification factor and generates a second waveform. The second waveform is delivered to the switch. An example modification factor is the ratio of the output voltage to the rectified input voltage of the power converter.Type: ApplicationFiled: January 31, 2013Publication date: July 31, 2014Applicant: ATMEL CorporationInventors: Hong Zhang, Sean S. Chen, Dilip Sangam
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Publication number: 20140160802Abstract: A fault protection and correction circuit for the control of a power converter is disclosed. An example circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a first and a second shut down mode modules, both of them cause the switching to stop. The circuit includes a module for receiving fault events. When a fault occurs, the controller enters the second shut down mode. The controller stays in the second shut down mode if the required current for this mode can be provided by the outside circuitry. Otherwise, the controller enters the first shut down mode that requires less current and subsequently restarts the controller. By modifying the outside circuitry the controller can respond differently to fault events.Type: ApplicationFiled: December 7, 2012Publication date: June 12, 2014Applicant: Atmel CorporationInventors: Hong Zhang, Sean S. Chen, Dilip Sangam, Wenbo Liang
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Publication number: 20140153291Abstract: A dual-mode circuit for the control of an AC/DC power converter is disclosed. An example dual-mode controller circuit generates a waveform that drives a switch on or off and controls the power converter. The controller circuit in addition to power factor correction (PFC) circuitry includes a critical conducting mode (CrM) module as well as a discontinuous conducting mode (DCM) module configured to generate waveforms adapted for CrM and DCM operation of a power converter. The circuit includes a node for receiving a feedback signal of a voltage or a current. Based on the received signal, one of the modules is selected at a time to supply the waveform at the output of the dual-mode controller. An example of the output waveform is a series of pulses that are configured to drive the switch that controls the transfer of power between input and output of the power converter.Type: ApplicationFiled: November 30, 2012Publication date: June 5, 2014Applicant: ATMEL CorporationInventors: Hong Zhang, Sean S. Chen, Dilip Sangam
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Publication number: 20140139126Abstract: System(s) and method(s) are provided for power management in an electronic display via compensation of a power source of a light-emitting-diode (LED) backlighting system. A compensation feedback loop includes a load-aware controller that receives the bad condition from a dimming controller and supplies a control signal to the power source. An efficiency regulator functionally connected the backlight circuitry closes the compensation, feedback loop and provides an input signal to the load-aware controller. The dimming controller implements phase-shifted pulse-modulation dimming, which based on duty cycle can establish a dimming equilibrium with two load conditions. The load aware controller includes a set of compensation blocks arranged in parallel, with a single compensation block connected to the input signal and that provides the control signal.Type: ApplicationFiled: November 11, 2013Publication date: May 22, 2014Applicant: Atmel CorporationInventors: ZHIYU YANG, KIEN VI, DILIP SANGAM, TUSHAR DHAYAGUDE
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Patent number: 8698728Abstract: Integrated backlight unit (BLU) and liquid crystal systems and circuits in liquid crystal display (LCD) systems are described. An LCD system can include a BLU to emit light at different intensities, and a BLU controller coupled to the BLU and configured to control the intensities. An LCD unit can receive the emitted light, and emanate light at a selected luminosity. The LCD unit can include pixels corresponding to: a liquid crystalline medium to provide a transmittance of the light emitted or to transmit a color light; and transistors adapted to modulate reference voltages. An LCD unit controller can be coupled to the LCD unit and configured to control luminosity of the light emanated from the LCD unit. The BLU and the LCD unit, which can be integrated in a single integrated circuit, can be controlled during concurrent time periods for contrast enhancement of images displayed from the LCD unit.Type: GrantFiled: November 2, 2009Date of Patent: April 15, 2014Assignee: Atmel CorporationInventors: Hendrik Santo, Dilip Sangam, Manish Kulkarni
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Patent number: 8604856Abstract: Systems, circuits and methods for phase-shifting pulse width modulated signal generation are disclosed. In some embodiments, a phase-shifting pulse width modulation circuit is configured to output pulses based on an input pulse width modulated signal. The pulses are staggered relative to one another, and can be received by a light-emitting diode driver for driving a light-emitting diode string at one or more time periods. The phase-shifting pulse width modulation circuit can include a counter-based programmable delay subcircuit consisting of two counter-based programmable delay blocks.Type: GrantFiled: December 21, 2012Date of Patent: December 10, 2013Assignee: Atmel CorporationInventors: Zhiyu Yang, Dilip Sangam, Tushar Dhayagude
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Patent number: 8547323Abstract: System(s) and methode s) are provided to regulate backlighting in a light emitting diode (LED)-based display through a sequence of alternate pulse-width-modulation (PWM) frame or sub-frame insertions. Alternate PWM frames or sub-frames can be black or non-black. A plurality of pixels in the display is partitioned into at least one zone including one or more rows of pixels; the at least one zone determines sub-frame period based on refresh frequency of the display. A sequence of alternate PWM sub-frames includes at least one alternate sub-frame and at least one normal sub-frame. Alternate PWM frames or alternate PWM sub-frames include a phase delay during which a backlight unit is turned off, and a PWM sequence in which the backlight unit is turned on with a finite duty cycle for the remainder of the PWM frame or sub-frame.Type: GrantFiled: March 23, 2012Date of Patent: October 1, 2013Assignee: Atmel CorporationInventors: Dilip Sangam, Balaji Venugopal Virajpet, Tushar Dhayagude
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Patent number: 8536933Abstract: The present invention relates to circuits and methods for limiting the operating area of a transistor in a constant current source. The circuits and methods use a detector and a driver to limit the operating area of a transistor. The detector and driver have parameters selected so that, when the voltage at the drain of the transistor satisfies a reference condition, the driver causes drain current of the transistor to decrease. The reference condition is determined relative to the maximum safe drain-to-source voltage at the design drain current of the constant current source.Type: GrantFiled: March 21, 2012Date of Patent: September 17, 2013Assignee: ATMEL CorporationInventors: Hendrik Santo, Dilip Sangam, Kien Vi, Ranajit Ghoman, Matthew D. Schindler
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Patent number: 8508730Abstract: System(s), apparatus(es), and method(s) are provided for control of quality of light emitted from a group of solid-state light (SSL) sources that are part of an illumination fixture. The control is based at least in part on regulation of the spectral power distribution (SPD) of the light to match a SPD of a reference light source. A spectroscopic analyzer collects electromagnetic (EM) radiation emitted from the group of SSL sources and EM radiation substantially emitted from the reference light source. A first controller analyzes spectroscopic data related to SPDs of the group of SSL sources and the reference light source and, based on the analysis issues a configuration of the group of SSL sources. Implementation of the configuration causes the group of SSL sources to emit EM radiation with a SPD that nearly matches the SPD of the EM radiation substantially emitted from the reference light source.Type: GrantFiled: January 28, 2011Date of Patent: August 13, 2013Assignee: Atmel CorporationInventors: Kevin Hempson, Dilip Sangam
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Publication number: 20130193859Abstract: Systems, circuits and methods for phase-shifting pulse width modulated signal generation are disclosed. In some embodiments, a phase-shifting pulse width modulation circuit is configured to output pulses based on an input pulse width modulated signal. The pulses are staggered relative to one another, and can be received by a light-emitting diode driver for driving a light-emitting diode string at one or more time periods. The phase-shifting pulse width modulation circuit can include a counter-based programmable delay subcircuit consisting of two counter-based programmable delay blocks.Type: ApplicationFiled: December 21, 2012Publication date: August 1, 2013Inventors: Zhiyu Yang, Dilip Sangam, Tushar Dhayagude
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Patent number: 8493300Abstract: The present invention involves an electrical system in which an analog signal channel passes through various integrated circuit chips (ICs). The channel can carry one or more analog signals. Each IC can modify the signal(s) passing through it and pass it on to another IC or system component. The channel can be programmable. Each IC can include a comparator or a multiplexor to receive the channel signal from another IC or system component and to modify the received signal before transmitting it to another IC or system component. The comparator or the multiplexor can be programmable and can be selectively configured to compare the incoming signal from the channel with a variety of other signals and thresholds, or to simply act as a flow through gate and allow the signal to pass without any modification. The comparison can determine the output of the comparator.Type: GrantFiled: March 11, 2008Date of Patent: July 23, 2013Assignee: Atmel CorporationInventors: Hendrik Santo, Ranajit Ghoman, Dilip Sangam, Kien Vi
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Patent number: 8476965Abstract: The present invention relates to circuits and methods for limiting the operating area of a transistor in a constant current source. The circuits and methods use a detector and a driver to limit the operating area of a transistor. The detector and driver have parameters selected so that, when the voltage at the drain of the transistor satisfies a reference condition, the driver causes drain current of the transistor to decrease. The reference condition is determined relative to the maximum safe drain-to-source voltage at the design drain current of the constant current source.Type: GrantFiled: March 10, 2008Date of Patent: July 2, 2013Assignee: Atmel CorporationInventors: Hendrik Santo, Dilip Sangam, Kien Vi, Ranajit Ghoman, Matthew D. Schindler