Patents Assigned to Power System Technologies, Ltd.
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Patent number: 9379629Abstract: A magnetic device and power converter employing the same. In one embodiment, the magnetic device includes a first L-core segment including a first leg and a second leg extending therefrom, and an opposing second L-core segment including a first leg and a second leg extending therefrom. The magnetic device also includes a winding formed around at least one of the first leg and the second leg of the first L-core segment or the second L-core segment.Type: GrantFiled: July 16, 2012Date of Patent: June 28, 2016Assignee: Power Systems Technologies, Ltd.Inventor: Sriram Chandrasekaran
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Patent number: 9300206Abstract: A controller for estimating a power of a power converter and method of estimating the same has been introduced herein. In one embodiment, the controller includes an analog/digital converter configured to provide samples of a rectified voltage waveform corresponding to a rectified sensed voltage of the power converter. The controller also includes a processor configured to estimate a minimum value of the rectified voltage waveform in accordance with the samples and remove an offset from the rectified voltage waveform to obtain an unbiased rectified voltage waveform in accordance with the estimate of the minimum value. The controller is also configured to obtain an unbiased rectified current waveform corresponding to sensed current of the power converter and provide an average power of the power converter.Type: GrantFiled: November 15, 2013Date of Patent: March 29, 2016Assignee: Power Systems Technologies Ltd.Inventors: Zhen Z. Ye, Jamie L. Dunn
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Patent number: 9246391Abstract: A controller for a power converter and method of operating the same. In one embodiment, the controller includes a peak detector, coupled to a circuit element of the power converter, configured to produce a signal corresponding to a peak current through a circuit element. The controller also includes an adjustable reference circuit responsive to a difference between the signal and a reference signal corresponding to a desired peak current to produce a corrected signal corresponding to the peak current.Type: GrantFiled: August 10, 2011Date of Patent: January 26, 2016Assignee: Power Systems Technologies Ltd.Inventor: Ralf Schroeder genannt Berghegger
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Patent number: 9240712Abstract: A controller for a power converter includes a current-sense device couplable in series with switched terminals of power switches of interleaved switching regulators and configured to produce a current-sense signal. The controller also includes an error amplifier configured to produce an error signal as a function of a characteristic of the power converter. The controller also includes a duty-cycle controller configured to sample the current-sense signal at mid-points of duty cycles of the power switches and regulate the characteristic as a function of the error signal and the current-sense signal.Type: GrantFiled: December 13, 2012Date of Patent: January 19, 2016Assignee: Power Systems Technologies Ltd.Inventor: Sriram Chandrasekaran
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Patent number: 9214264Abstract: A magnetic device and power converter employing the same. In one embodiment, the magnetic device includes a first L-core segment including a first leg and a second leg extending therefrom, and an opposing second L-core segment including a first leg and a second leg extending therefrom. The magnetic device also includes a winding formed around at least one of the first leg and the second leg of the first L-core segment or the second L-core segment.Type: GrantFiled: July 16, 2012Date of Patent: December 15, 2015Assignee: Power systems Technologies, Ltd.Inventor: Sriram Chandrasekaran
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Patent number: 9203293Abstract: An EMI emission suppressing system, apparatus and method that enables the EMI produced by high frequency switching of a switching circuit to be suppressed via the transfer of the higher order harmonic emissions to a frequency range below the standard EMI bandwidth of less than 150 KHz by applying low frequency modulation or jitter into the feedback of a switching signal of the switching circuit. The EMI suppression is achieved with minimal added ripple on the output signal of the switching circuit by using discontinuous modulations in the form of only applying the low frequency modulation when the switch or higher order harmonic producing element of the switching circuit is accessing, or drawing power from, the main power supply.Type: GrantFiled: June 7, 2013Date of Patent: December 1, 2015Assignee: Power Systems Technologies Ltd.Inventor: Mark Telefus
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Patent number: 9203292Abstract: An EMI emission suppressing system, apparatus and method that enables the EMI produced by high frequency switching of a switching circuit to be suppressed via the transfer of the higher order harmonic emissions to a frequency range below the standard EMI bandwidth of less than 150 KHz by applying low frequency modulation or jitter into the feedback of a switching signal of the switching circuit. The EMI suppression is achieved with minimal added ripple on the output signal of the switching circuit by using discontinuous modulations in the form of only applying the low frequency modulation when the switch or higher order harmonic producing element of the switching circuit is accessing, or drawing power from, the main power supply.Type: GrantFiled: June 7, 2013Date of Patent: December 1, 2015Assignee: POWER SYSTEMS TECHNOLOGIES LTD.Inventor: Mark Telefus
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Patent number: 9190898Abstract: A controller for a power converter and method of operating the same. In one embodiment, the controller includes an inductor-inductor-capacitor (“LLC”) controller configured to receive an error signal from an error amplifier to control a switching frequency of an LLC stage of the power converter to regulate an output voltage thereof. The controller also includes a power factor correction (“PFC”) controller configured to control a bus voltage produced by a PFC stage of the power converter and provided to the LLC stage so that an average switching frequency thereof is substantially maintained at a desired switching frequency.Type: GrantFiled: July 6, 2012Date of Patent: November 17, 2015Assignee: Power Systems Technologies, LtdInventors: Antony Brinlee, Sriram Chandrasekaran, Steven Malechek
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Patent number: 9099232Abstract: A magnetic device and power converter employing the same. In one embodiment, the magnetic device includes a first L-core segment including a first leg and a second leg extending therefrom, and an opposing second L-core segment including a first leg and a second leg extending therefrom. The magnetic device also includes a winding formed around at least one of the first leg and the second leg of the first L-core segment or the second L-core segment.Type: GrantFiled: July 16, 2012Date of Patent: August 4, 2015Assignee: Power Systems Technologies Ltd.Inventor: Sriram Chandrasekaran
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Patent number: 9088216Abstract: A controller for a power converter and method of operating the same employable with a bridge rectifier having first and second synchronous rectifier switches. In one embodiment, the controller includes an amplifier configured to enable a turn-on delay for the first synchronous rectifier switch. The controller also includes a discharge switch having first and second switched terminals coupled to gate and source terminals, respectively, of the first synchronous rectifier switch and configured to discharge a gate-to-source capacitance of the first synchronous rectifier switch to enable a turn off thereof.Type: GrantFiled: January 19, 2010Date of Patent: July 21, 2015Assignee: Power Systems Technologies, Ltd.Inventors: Paul Garrity, Zaohong Yang
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Publication number: 20150198634Abstract: A controller for use with a power converter and method of operating the same. In one embodiment, the controller includes a transformer voltage sensing circuit configured to produce a preliminary bus voltage sample. The controller also includes a frequency correction circuit coupled to the transformer voltage sensing circuit and configured to correct the preliminary bus voltage sample to produce an estimate of an internal bus voltage of the power converter.Type: ApplicationFiled: January 13, 2014Publication date: July 16, 2015Applicant: POWER SYSTEMS TECHNOLOGIES LTD.Inventor: Antony Brinlee
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Patent number: 9077248Abstract: A start-up circuit for a power adapter and method of operating the same. In one embodiment, the power adapter includes a start-up circuit configured to provide an initial bias voltage for the power adapter. The power adapter also includes a crowbar circuit configured to turn on the start-up circuit upon loss of an ac mains voltage supplied to the power adapter.Type: GrantFiled: July 3, 2012Date of Patent: July 7, 2015Assignee: Power Systems Technologies LtdInventor: Antony Brinlee
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Publication number: 20150138857Abstract: A controller for estimating a power of a power converter and method of estimating the same has been introduced herein. In one embodiment, the controller includes an analog/digital converter configured to provide samples of a rectified voltage waveform corresponding to a rectified sensed voltage of the power converter. The controller also includes a processor configured to estimate a minimum value of the rectified voltage waveform in accordance with the samples and remove an offset from the rectified voltage waveform to obtain an unbiased rectified voltage waveform in accordance with the estimate of the minimum value. The controller is also configured to obtain an unbiased rectified current waveform corresponding to sensed current of the power converter and provide an average power of the power converter.Type: ApplicationFiled: November 15, 2013Publication date: May 21, 2015Applicant: Power Systems Technologies, Ltd.Inventors: Zhen Z. Ye, Jamie L. Dunn
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Patent number: 9019061Abstract: A magnetic device formed with U-shaped core pieces employable in a power converter, and a method of forming the same. In one embodiment, the magnetic device includes a rectilinear core piece formed of a magnetic material, and first and second U-shaped core pieces positioned on the rectilinear core piece. The magnetic device also includes first and second conductive windings formed about the first and second U-shaped core pieces, respectively.Type: GrantFiled: March 31, 2010Date of Patent: April 28, 2015Assignee: Power Systems Technologies, Ltd.Inventor: Sriram Chandrasekaran
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Publication number: 20150098254Abstract: A controller for use with a power converter and method of operating the same. In one embodiment, the controller includes a gate drive terminal configured to provide a gate drive signal to enable conductivity of a power switch during a first portion of a switching interval and to disable conductivity of the power switch during a second portion of the switching interval. The controller also includes a current sense terminal configured to receive a power switch signal indicative of a current in the power switch during the first portion of the switching interval, and receive a control signal to operate the power converter or provide a status signal indicative of an operating condition of the power converter during the second portion of the switching interval.Type: ApplicationFiled: October 9, 2013Publication date: April 9, 2015Applicant: Power Systems Technologies Ltd.Inventors: Antony Brinlee, Steven Malechek
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Patent number: 8976549Abstract: A startup circuit with reduced power dissipation, method of operating the same and a power converter employing the startup circuit. In one embodiment, the startup circuit for a controller includes a charge accumulation circuit having a resistor series-coupled to a capacitor and a first Schmitt trigger having an input coupled to the capacitor. The startup circuit also includes a second Schmitt trigger having an input coupled to an output of the first Schmitt trigger and configured to provide a bias voltage for the controller via the capacitor when an input voltage thereto exceeds a trip voltage.Type: GrantFiled: December 3, 2009Date of Patent: March 10, 2015Assignee: Power Systems Technologies, Ltd.Inventor: Ralf Schroeder genannt Berghegger
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Publication number: 20140301111Abstract: A power converter employing a control system configured to make multiple functional use of a circuit node therein and method of operating the same. In one embodiment, the power converter includes a power train including at least one power switch. The power converter also includes a control system including an opto-isolator circuit, including a resistor, configured to receive an output signal from the power converter and provide a feedback signal to a feedback node for the control system to provide a switch control signal for the at least one power switch. The control system also includes a current source configured to produce multiple voltage levels at the feedback node in accordance with the resistor, thereby enabling multiple functional uses of the feedback node.Type: ApplicationFiled: June 24, 2014Publication date: October 9, 2014Applicant: POWER SYSTEMS TECHNOLOGIES LTD.Inventors: Aaron Jungreis, Antony Brinlee, Paul Garrity
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Publication number: 20140254215Abstract: A control system for a power converter with reduced power dissipation and method of operating the same. In one embodiment, the control system includes a first controller coupled to a primary winding of a transformer and configured to control a duty cycle of a power switch to regulate an output characteristic of the power converter. The control system also includes a second controller configured to provide a signal to one of a secondary winding of the transformer and a circuit element spanning an isolation boundary of the transformer in response to a dynamic change of the output characteristic to trigger the first controller to initiate the duty cycle for the power switch.Type: ApplicationFiled: April 24, 2014Publication date: September 11, 2014Applicant: Power Systems Technologies Ltd.Inventors: Antony Brinlee, Ralf Schroeder genannt Berghegger
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Patent number: 8792257Abstract: A power converter with reduced power dissipation at light loads and method of operating the same. In one embodiment, the power converter includes an opto-isolator circuit configured to produce an output signal dependent on an output characteristic of the power converter. The power converter also includes a controller configured to control the output characteristic to a first regulated value when the output signal is greater than or equal to a threshold level, and control the output characteristic to a second regulated value less than the first regulated value when the output signal is less than the threshold level.Type: GrantFiled: March 25, 2011Date of Patent: July 29, 2014Assignee: Power Systems Technologies, Ltd.Inventor: Ralf Schröder genannt Berghegger
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Patent number: 8792256Abstract: A controller for a switch and a method of operating the same. In one embodiment, the controller is configured to measure a voltage of a control terminal of the switch and select a first mode of operation if the voltage of the control terminal is greater than a threshold voltage, and a second mode of operation if the voltage of the control terminal is less than the threshold voltage.Type: GrantFiled: January 27, 2012Date of Patent: July 29, 2014Assignee: Power Systems Technologies Ltd.Inventors: Ralf Schroeder genannt Berghegger, Michael Frey