Patents by Inventor Markus Ziegler

Markus Ziegler 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).

  • Patent number: 10381926
    Abstract: A digitally compensated hysteretic power supply with enhanced resolution is provided. Such a power supply includes a comparator that is used to compare a load current sense signal with an internal signal generated from a digital-to-analog converter (DAC). A compensation circuit at a DAC input operates to improve current accuracy beyond the given DAC resolution. The current sense signal is converted to its digital equivalent, which is fed to a proportional-integral (PI) compensation loop, which in turn generates a relatively precise high resolution DAC input value. The DAC uses the higher part of the DAC value. The lower part of the DAC value is treated as a duty cycle number, and the DAC output is toggled between two levels at this duty cycle. This toggling generates a current output signal having a value that is the average of the two toggled values.
    Type: Grant
    Filed: September 24, 2015
    Date of Patent: August 13, 2019
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Peng Xiao, Markus Ziegler
  • Publication number: 20170303355
    Abstract: A driver port that provides selectable output currents based on connections thereto, and a driver including the same, is provided. A plurality of shunt resistors are connected in series between a negative output of a driver and a ground. A driver port having a plurality of connection points is provided, each respective connection point connected to a different connection between two of the plurality of shunt resistors. A load including one or more solid state light sources is capable of being connected between one of the connection points of the driver port and a positive output of the driver.
    Type: Application
    Filed: July 4, 2017
    Publication date: October 19, 2017
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler, Naveen Tumula, Thomas Schalton
  • Patent number: 9699837
    Abstract: A driver port that provides selectable output currents based on connections thereto, and a driver including the same, is provided. A plurality of shunt resistors are connected in series between a negative output of a driver and a ground. A driver port having a plurality of connection points is provided, each respective connection point connected to a different connection between two of the plurality of shunt resistors. A load including one or more solid state light sources is capable of being connected between one of the connection points of the driver port and a positive output of the driver.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: July 4, 2017
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler, Naveen Tumula, Thomas Schalton
  • Publication number: 20170093280
    Abstract: A digitally compensated hysteretic power supply with enhanced resolution is provided. Such a power supply includes a comparator that is used to compare a load current sense signal with an internal signal generated from a digital-to-analog converter (DAC). A compensation circuit at a DAC input operates to improve current accuracy beyond the given DAC resolution. The current sense signal is converted to its digital equivalent, which is fed to a proportional-integral (PI) compensation loop, which in turn generates a relatively precise high resolution DAC input value. The DAC uses the higher part of the DAC value. The lower part of the DAC value is treated as a duty cycle number, and the DAC output is toggled between two levels at this duty cycle. This toggling generates a current output signal having a value that is the average of the two toggled values.
    Type: Application
    Filed: September 24, 2015
    Publication date: March 30, 2017
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Peng Xiao, Markus Ziegler
  • Publication number: 20170063240
    Abstract: A DC-DC flyback converter includes a transformer and a switching component connected between the transformer and a ground. The switching component controls current flow through the primary winding of the transformer. A snubber circuit is connected between ground and the connection between the transformer and the switching component. The snubber circuit reduces transient voltage spikes across the switching component. A capacitive component of the snubber circuit provides stability for a primary side auxiliary output voltage while maintaining power factor and THD performance.
    Type: Application
    Filed: August 24, 2015
    Publication date: March 2, 2017
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler, Andrew Johnsen
  • Patent number: 9301375
    Abstract: A multi-strike ballast to ignite an electrodeless lamp is disclosed, and includes an inverter circuit, a protection circuit, and a controller. The inverter circuit, upon activation, sends an ignition pulse to the lamp. The inverter circuit shuts down upon receiving a deactivation signal, and activates upon receiving an activation signal, triggering another ignition pulse. The protection circuit senses a change in a voltage associated with the lamp. The sensed changed may indicate that the lamp has not yet ignited or that the lamp is broken. The controller receives the sensed change in voltage and, in response, sends a deactivation signal to the inverter circuit. The controller waits a predetermined time and then sends an activation signal to the inverter circuit. The controller repeats until a change in voltage associated with the lamp is not sensed, or until a predefined number of repeats occur, providing multiple ignition pulses to the lamp.
    Type: Grant
    Filed: October 28, 2013
    Date of Patent: March 29, 2016
    Assignee: OSRAM SYLVANIA INC.
    Inventors: Nitin Kumar, Markus Ziegler, Shashank Bakre, Ayan Choudhury
  • Publication number: 20160043658
    Abstract: An isolated transformer-less capacitive power supply, and methods for using the same to generate power, are disclosed. The power supply includes first and second input terminals to receive an alternating current (AC) voltage. The power supply also includes first rectifier circuitry coupled to the first and second input terminals. The first rectifier circuitry is configured to generate a first direct current (DC) voltage. The power supply also includes second rectifier circuitry, including a first capacitor and a second capacitor coupled to the first and second input terminals, respectively. The second rectifier circuitry is configured to receive the AC voltage via the first capacitor and the second capacitor and to generate a second DC voltage concurrently with the generation of the first DC voltage.
    Type: Application
    Filed: July 30, 2015
    Publication date: February 11, 2016
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Arturo Hernadez Lopez, Markus Ziegler, Luis Manual Leon Lara
  • Publication number: 20150357920
    Abstract: An inverter for a lighting device including one or more solid state light sources is used to power a secondary load, such as a cooling device, sensor, or control with an auxiliary power circuit that provides a selectable auxiliary voltage to the secondary load. The auxiliary power circuit includes a voltage regulation circuit and a voltage selection circuit. The voltage selection circuit provides a feedback voltage to the voltage regulation circuit which his indicative of auxiliary output voltage. The voltage regulation circuit operates based on the feedback voltage and a reference voltage to adjust the auxiliary voltage to a level that differs from the input voltage from the inverter.
    Type: Application
    Filed: June 10, 2014
    Publication date: December 10, 2015
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Ayan Choudhury, Nitin Kumar, Markus Ziegler
  • Patent number: 9119270
    Abstract: Systems and method for detecting failure in solid state light sources and recovering from the failure are provided. A light engine including a controller circuit and strings of solid state light sources emits light in response to drive current provided by a driver circuit. The controller circuit monitors an output voltage of the driver circuit, and detects a failure of one of the solid state light sources. The failure is associated with a change in the output voltage of the driver circuit. The controller circuit then transmits a first signal to the driver circuit in response to detecting a failure, and the driver circuit is configured to decrease the drive current in response to the first signal.
    Type: Grant
    Filed: May 29, 2013
    Date of Patent: August 25, 2015
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Keng Chen, Christian Breuer, Markus Ziegler
  • Patent number: 9084322
    Abstract: A bi-level current configurable driver is provided. The driver includes a feedback circuit, a driver circuit providing a driver signal to a half bridge inverter, and a step-dim interface coupled to a first alternating current input line, a second alternating current input line, and a neutral line, providing voltage to the driver circuit. The driver also includes a first feedforward circuit coupled to the step-dim interface, where the first feedforward circuit receives a first signal from the step-dim interface based on the states of the first alternating current input line, the second alternating current input line, and the neutral line. In a first state, the driver provides full current to a load, and in a second state, the driver provides less than full current to the load.
    Type: Grant
    Filed: June 24, 2014
    Date of Patent: July 14, 2015
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler
  • Patent number: 9006977
    Abstract: Systems and methods for detecting an incorrect load and preventing powering of that load, until a load change is detected, are disclosed. An incorrect load can be removed and a newly attached valid load can be operated without requiring a reset. A power supply or driver system for a lighting system including one or more solid state light sources includes the systems and methods. The power supply or driver system includes a processor and memory arrangement configured to detect whether a load is operable or non-operable while still being responsive to a new load being attached at any time, and to prevent the system from checking the same load more than once. These may be used in conjunction with features like auto-recovery, restart after faults, and load-hot-plug capability, while perhaps simultaneously reducing cyclical flashing of light output.
    Type: Grant
    Filed: March 11, 2013
    Date of Patent: April 14, 2015
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Avinash Gunda, Christian Breuer, Markus Ziegler
  • Publication number: 20150088611
    Abstract: A passive measuring technique and system processes and analyzes imprecisely reported location estimates collected from a plurality of mobile devices. The number and socio-demographic composition of persons within defined areas of interest are estimated over time. Each mobile device is assigned to a group and identified by an anonymized identifier, and the identifiers of devices within each group are refreshed on a rolling basis to further enhance privacy. A statistical weighting approach is applied so that each device represents a fraction of the population and socio-demographic profile of one or more segmentation districts. Users requesting a defined area of interest via a communication network receive an estimate—derived by modeling respectively anonymized mobile devices within an area of interest over a selectable time period as corresponding, statistically weighted devices—of the number and socio-demographic profile of all persons within the area of interest over the selectable time period.
    Type: Application
    Filed: September 24, 2013
    Publication date: March 26, 2015
    Inventors: Hendrik Wagenseil, Markus Ziegler, Volker Bosch
  • Publication number: 20150042242
    Abstract: A driver port that provides selectable output currents based on connections thereto, and a driver including the same, is provided. A plurality of shunt resistors are connected in series between a negative output of a driver and a ground. A driver port having a plurality of connection points is provided, each respective connection point connected to a different connection between two of the plurality of shunt resistors. A load including one or more solid state light sources is capable of being connected between one of the connection points of the driver port and a positive output of the driver.
    Type: Application
    Filed: June 24, 2014
    Publication date: February 12, 2015
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler, Naveen Tumula, Thomas Schalton
  • Publication number: 20150043246
    Abstract: A no load detection and shutdown circuit in an isolated driver is provided. A no load condition is detected by primary side evaluation of a reflected voltage. If a determination is made that a no load condition is present, the no load detection circuit signals a half bridge driver of the driver to cease oscillations, shutting down the driver.
    Type: Application
    Filed: June 24, 2014
    Publication date: February 12, 2015
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler
  • Publication number: 20150042227
    Abstract: A bi-level current configurable driver is provided. The driver includes a feedback circuit, a driver circuit providing a driver signal to a half bridge inverter, and a step-dim interface coupled to a first alternating current input line, a second alternating current input line, and a neutral line, providing voltage to the driver circuit. The driver also includes a first feedforward circuit coupled to the step-dim interface, where the first feedforward circuit receives a first signal from the step-dim interface based on the states of the first alternating current input line, the second alternating current input line, and the neutral line. In a first state, the driver provides full current to a load, and in a second state, the driver provides less than full current to the load.
    Type: Application
    Filed: June 24, 2014
    Publication date: February 12, 2015
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Nitin Kumar, Markus Ziegler
  • Patent number: 8928255
    Abstract: A dynamic step dimming interface is provided that allows a ballast to energize a lamp in a dim mode or a normal mode. The ballast includes a lamp controller that energizes the lamp using an oscillating current. The oscillating current is also provided to a voltage monitor, which indicates the voltage level of the oscillating current, and to a rectifier, which provides an output indicative of the oscillating current. The rectifier is responsive to user input indicating whether the dim mode or the normal mode is to be used. A processing circuit receives the voltage level from the voltage monitor and provides a mode command to the ballast, indicating the lamp mode, based on inputs received, and provides a reference voltage to a comparator. The comparator receives the rectifier output and the reference voltage, and generates a voltage indicative of a power level of the lamp for the processing circuit.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: January 6, 2015
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Arturo Hernandez Lopez, Markus Ziegler, Carlos Daniel Ortega Jaramillo
  • Patent number: 8836240
    Abstract: A ballast for energizing a lamp at a lighting level selected from a plurality of lamp lighting levels. The ballast includes a buck converter circuit configured to receive a DC voltage signal having a substantially constant magnitude. The buck converter circuit has a duty cycle for generating a lamp voltage output signal from the DC voltage signal. The lamp voltage output signal has a magnitude that is varied by the duty cycle to energize the lamp at the plurality of lamp lighting levels. A controller is configured to receive a dim input signal indicative of the selected lamp lighting level and to provide a control signal to the buck converter circuit as a function of the dim input signal. The control signal indicates a particular duty cycle corresponding to a lamp voltage output signal having a magnitude for energizing the lamp at the selected lamp lighting level.
    Type: Grant
    Filed: June 30, 2012
    Date of Patent: September 16, 2014
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Nitin Kumar, Markus Ziegler, Robert Martin, Shashank Bakre
  • Publication number: 20140252955
    Abstract: Systems and methods for detecting an incorrect load and preventing powering of that load, until a load change is detected, are disclosed. An incorrect load can be removed and a newly attached valid load can be operated without requiring a reset. A power supply or driver system for a lighting system including one or more solid state light sources includes the systems and methods. The power supply or driver system includes a processor and memory arrangement configured to detect whether a load is operable or non-operable while still being responsive to a new load being attached at any time, and to prevent the system from checking the same load more than once. These may be used in conjunction with features like auto-recovery, restart after faults, and load-hot-plug capability, while perhaps simultaneously reducing cyclical flashing of light output.
    Type: Application
    Filed: March 11, 2013
    Publication date: September 11, 2014
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Avinash Gunda, Christian Breuer, Markus Ziegler
  • Publication number: 20140252970
    Abstract: A dynamic step dimming interface is provided that allows a ballast to energize a lamp in a dim mode or a normal mode. The ballast includes a lamp controller that energizes the lamp using an oscillating current. The oscillating current is also provided to a voltage monitor, which indicates the voltage level of the oscillating current, and to a rectifier, which provides an output indicative of the oscillating current. The rectifier is responsive to user input indicating whether the dim mode or the normal mode is to be used. A processing circuit receives the voltage level from the voltage monitor and provides a mode command to the ballast, indicating the lamp mode, based on inputs received, and provides a reference voltage to a comparator. The comparator receives the rectifier output and the reference voltage, and generates a voltage indicative of a power level of the lamp for the processing circuit.
    Type: Application
    Filed: February 25, 2014
    Publication date: September 11, 2014
    Applicant: OSRAM SYLVANIA INC.
    Inventors: Arturo Hernandez Lopez, Markus Ziegler, Carlos Daniel Ortega Jaramillo
  • Publication number: 20140197736
    Abstract: A ballast including a driver circuit, a filament heating circuit, a current detector circuit, and a control circuit is provided. The driver circuit generates an oscillating current signal. The filament heating circuit heats filaments of a lamp connected to the ballast and includes a heating transformer with primary and secondary windings and a switching circuit. The primary winding is connected to the driver circuit and the switching circuit. The secondary winding is connected to the primary winding and may be connected to the lamp. The duty cycle of the switching circuit controls current provided from the driver circuit to the primary winding to heat the lamp. The current detector circuit is connected to the switching circuit and detects a parameter of the current in the primary winding, which indicates the number of lamp filaments connected to the ballast. The control circuit controls the driver circuit based on the detected parameter.
    Type: Application
    Filed: January 15, 2013
    Publication date: July 17, 2014
    Applicant: OSRAM SYLVANIA Inc.
    Inventors: Eliseo Carcamo, Markus Ziegler