Patents by Inventor Ernest H. Wittenbreder

Ernest H. Wittenbreder 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: 8675374
    Abstract: Methods, systems, and devices are described for an adjustment module that interacts with a parameter detection module to provide a threshold value for initiating switching of a switching module in a cyclical electronic system. Aspects of the present disclosure provide a switching module used in conjunction with an inductor that is coupled with the switching module. The threshold voltage for switching the switching module may be adjusted to provide switching at substantially zero volts while maintaining sufficient energy in the inductor to drive the voltage at a switching element in the switching module to zero volts. Such auto-adjustment circuits may allow for enhanced efficiency in cyclical electronic systems. The output of an up/down counter may be used to set another parameter that effects the performance of the cyclical electronic system in order to enhance the performance of the cyclical electronic system.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: March 18, 2014
    Assignee: Microsemi Corporation
    Inventors: Charles Coleman, Sam Seiichiro Ochi, Ernest H. Wittenbreder, Jr., Yeshoda Yedevelly
  • Publication number: 20120044729
    Abstract: A bridgeless power factor correction system may include an AC input having a first input terminal and a second input terminal, an inductor module coupled with the first input terminal, and a switching module coupled between the second input terminal and the inductor module. The switching module may comprise a bi-directional voltage blocking switch that is configured to selectively couple the inductor module with the AC input based on an output voltage and a phase difference between an input voltage waveform and an input current waveform. The switching module may also comprise an auxiliary network for reversing a winding current to achieve zero voltage switching. An output module may be coupled with the inductor module, and provide an output to a load. The inductor module may include a magnetically coupled inductor having a primary and secondary winding. The output module may include a full or half bridge rectifier.
    Type: Application
    Filed: August 23, 2011
    Publication date: February 23, 2012
    Applicant: MICROSEMI CORPORATION
    Inventors: Charles Coleman, Ernest H. Wittenbreder, JR.
  • Publication number: 20120032664
    Abstract: Methods, systems, and devices are described for a non-isolated dc-dc power converter that uses a single magnetic element and provides both a positive and a negative voltage output. The magnetic element, such as an inductor, is coupled with two or more switching modules that electrically switch the inductor to and from a voltage source, an inductor terminal, and/or a load. By electrically connecting and electrically isolating different components at various times, separate positive and negative voltage outputs are provided using the single inductor element. Switching may be controlled by a controller module, and a magnitude of the dc output voltage may be selected based on two or more resistors coupled with the controller module.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 9, 2012
    Applicant: Microsemi Corporation
    Inventors: Charles Coleman, Ernest H. Wittenbreder, JR.
  • Publication number: 20120032728
    Abstract: Methods, systems, and devices are described for an adjustment module that interacts with a parameter detection module to provide a threshold value for initiating switching of a switching module in a cyclical electronic system. Aspects of the present disclosure provide a switching module used in conjunction with an inductor that is coupled with the switching module. The threshold voltage for switching the switching module may be adjusted to provide switching at substantially zero volts while maintaining sufficient energy in the inductor to drive the voltage at a switching element in the switching module to zero volts. Such auto-adjustment circuits may allow for enhanced efficiency in cyclical electronic systems. The output of an up/down counter may be used to set another parameter that effects the performance of the cyclical electronic system in order to enhance the performance of the cyclical electronic system.
    Type: Application
    Filed: August 3, 2011
    Publication date: February 9, 2012
    Applicant: Microsemi Corporation
    Inventors: Charles Coleman, Sam Seiichiro Ochi, Ernest H. Wittenbreder, JR., Yeshoda Yedevelly
  • Publication number: 20110032731
    Abstract: Methods, systems, and devices are described for using isolated and non-isolated circuit structures and control methods for achieving multiple independently regulated input and output parameters using a single, simple, primary magnetic circuit element. For example, structures and methods are revealed for achieving single-stage power factor correction with high power factor and multiple independently regulated outputs using a single, simple, primary magnetic circuit element. Other structures and methods are revealed for achieving multiple independently regulated outputs without power factor correction using a single primary magnetic circuit element for both isolated and non-isolated power conversion applications.
    Type: Application
    Filed: August 4, 2010
    Publication date: February 10, 2011
    Applicant: ASIC Advantage Inc.
    Inventors: Charles Coleman, George Rasko, Sam Seiichiro Ochi, Ernest H. Wittenbreder, JR.
  • Publication number: 20100328971
    Abstract: Methods, systems, and devices are described for using coupled inductor boost circuits to operate in a zero current switching (ZCS) and/or a zero voltage switching (ZVS) boundary mode. Some embodiments include a coupled inductor boost circuit that can substantially eliminate rectifier reverse recovery effects without using a high side primary switch and a high side primary switch driver. Other embodiments include a coupled inductor boost circuit that can achieve substantially zero voltage switching. ZCS and ZVS modes may be effectuated using control techniques. For example, a magnetizing current may be sensed or otherwise represented, and a signal may be generated accordingly for controlling switching of the controller.
    Type: Application
    Filed: June 28, 2010
    Publication date: December 30, 2010
    Applicant: ASIC Advantage Inc.
    Inventors: George Rasko, Ernest H. Wittenbreder, JR.
  • Patent number: 6822427
    Abstract: Several novel zero voltage switching (ZVS) cells and a ZVS dc to dc transformer circuit are revealed. A U core transformer structure for use with the dc to dc transformer circuit is also revealed. An optimal gate drive circuit that achieves optimal switch timing for ZVS switches is revealed. The optimal gate drive circuit achieves optimal timing for the case in which there is sufficient energy available to drive a zero voltage transition and also for the case in which there is insufficient energy to drive a zero voltage transition providing turn on current to the switch at the minimum drain voltage of the switch. A magnetically coupled multi-phase converter cell structure is revealed which achieves reduced switch ripple current and fast transient response for multi-phase systems with three or more cells. A ZVS active reset switch drive scheme is revealed for providing zero voltage switching in bi-directional power flow converters for both directions of power flow using a single active reset circuit.
    Type: Grant
    Filed: May 1, 2002
    Date of Patent: November 23, 2004
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder
  • Patent number: 6650550
    Abstract: Synchronous rectifier self drive mechanisms are revealed which are universally applicable to zero voltage switching power converters which rely on an auxiliary inductor to drive the critical turn on transition of the main switch of the power converter. The voltage wave form generated by the auxiliary inductor is well suited to synchronous rectifier self drive. Voltage limiting circuits that reduce the voltage swing of synchronous rectifier gates are also revealed. These voltage limiting circuits reduce the energy circulated into and out of the synchronous rectifier gates and protect the synchronous rectifier gate circuits from negative over voltage.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: November 18, 2003
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder, Jr.
  • Publication number: 20030205990
    Abstract: Several novel zero voltage switching (ZVS) cells and a ZVS dc to dc transformer circuit are revealed. A U core transformer structure for use with the dc to dc transformer circuit is also revealed. An optimal gate drive circuit that achieves optimal switch timing for ZVS switches is revealed. The optimal gate drive circuit achieves optimal timing for the case in which there is sufficient energy available to drive a zero voltage transition and also for the case in which there is insufficient energy to drive a zero voltage transition providing turn on current to the switch at the minimum drain voltage of the switch. A magnetically coupled multi-phase converter cell structure is revealed which achieves reduced switch ripple current and fast transient response for multi-phase systems with three or more cells. A ZVS active reset switch drive scheme is revealed for providing zero voltage switching in bi-directional power flow converters for both directions of power flow using a single active reset circuit.
    Type: Application
    Filed: May 1, 2002
    Publication date: November 6, 2003
    Inventor: Ernest H. Wittenbreder,
  • Publication number: 20030151927
    Abstract: Synchronous rectifier self drive mechanisms are revealed which are universally applicable to zero voltage switching power converters which rely on an auxiliary inductor to drive the critical turn on transition of the main switch of the power converter. The voltage wave form generated by the auxiliary inductor is well suited to synchronous rectifier self drive. Voltage limiting circuits that reduce the voltage swing of synchronous rectifier gates are also revealed. These voltage limiting circuits reduce the energy circulated into and out of the synchronous rectifier gates and protect the synchronous rectifier gate circuits from negative over voltage.
    Type: Application
    Filed: May 28, 2002
    Publication date: August 14, 2003
    Inventor: Ernest H. Wittenbreder
  • Patent number: 6580255
    Abstract: Simple adaptive gate drive circuits, applicable to switches that turn on at zero voltage, such as mosfets or IGBTs, are revealed. The new gate drive circuits improve the timing for turn on of the switches, reduce gate drive losses, and limit gate voltage stress. In its simplest form the gate drive circuit requires only a single small mosfet and two diodes. The adaptive gate drive circuit provides optimal switch turn on timing for the case in which the drive energy available to drive the turn on transition is sufficient to drive the main switch to zero volts. The adaptive gate drive circuit also provides optimal switch turn on timing for the case in which the energy available to drive the transition is insufficient to drive the transition all the way to zero volts, turning the main switch on at the minimum main switch voltage thereby minimizing main switch switching losses.
    Type: Grant
    Filed: May 28, 2002
    Date of Patent: June 17, 2003
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder, Jr.
  • Patent number: 6560127
    Abstract: A highly efficient and simple power conversion circuit (300) having zero voltage switching (ZVS) includes a novel switch timing technique, such that the need for an leakage inductor connected in series with the primary circuit of the converter and rectifier diodes is eliminated. A switch timing circuit (351) located in an output side circuit (350) enables the use of the natural stored magnetic energy in the output side circuit (350) to drive the critical switching transitions to accomplish soft switching for all of the switches (314-317) in a full bridge forward converter (300) for all transitions. This power conversion circuit (300) includes a full bridge circuit (310) having plurality of switching devices (314-317) that intermittently couple the primary winding (327) to the input of the power converter (300). A transformer (326) couples to receive power from the full bridge circuit (310) into its primary winding (327).
    Type: Grant
    Filed: May 4, 2001
    Date of Patent: May 6, 2003
    Assignee: Texas Instruments Incorporated
    Inventor: Ernest H. Wittenbreder, Jr.
  • Patent number: 6507176
    Abstract: Five circuit synthesis methods, for forming new power conversion circuits with enhanced electromagnetic compatibility and improved AC performance from old circuits with AC performance and/or electromagnetic compatibility deficiencies, are revealed. The new synthesis methods achieve performance improvements without requiring the addition of magnetic cores. In all cases a simple toroidal magnetic core structure is not precluded. In all cases splitting or adding magnetic windings is required, and, in many cases, additional capacitors are required. Many new circuits formed by applying the synthesis methods are revealed. The results achieved by application of the synthesis methods include zero ripple current at all terminals without adding magnetic cores or requiring a complex magnetic circuit element, cancellation of common mode currents, improved control loop bandwidth, and faster transient response.
    Type: Grant
    Filed: September 4, 2001
    Date of Patent: January 14, 2003
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder, Jr.
  • Patent number: 6483369
    Abstract: Composite switches comprising multiple mosfets arranged in cascode which achieve higher efficiency and faster switching are revealed. The gate of a lower mosfet, a low voltage small die size mosfet, is driven with a conventional control circuit for modulation of the composite switch. The upper mosfet, a large die size high voltage mosfet, is controlled at its source terminal by the smaller mosfet while the gate of the upper mosfet is connected to a capacitor whose voltage remains fixed such that no net drive power is required by the gate circuit to drive the upper mosfet. The composite switch simultaneously achieves the low conduction losses of a large die device with the gate drive losses and fast switching of a small die device.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: November 19, 2002
    Assignee: Technical Witts Inc.
    Inventor: Ernest H. Wittenbreder, Jr.
  • Patent number: 6462963
    Abstract: A tapped inductor buck converter which achieves zero voltage switching and continuous input and output terminal currents is revealed. To achieve these results an additional switch, a small inductor, and a capacitor are required. The small inductor serves as a source of energy for driving the critical turn on transition of the main switch and the same small inductor also serves as a filter component for smoothing the input and output terminal currents. Simple adaptive gate drive circuits are revealed that improve the timing for turn on of zero voltage switches and reduce gate drive losses. A synchronous rectifier self drive mechanism is revealed which is universally applicable to zero voltage switching power converters with a single main switch which rely on an auxiliary inductor to drive the critical turn on transition of the single main switch. The wave form generated by the auxiliary inductor is ideally suited to synchronous rectifier self drive.
    Type: Grant
    Filed: February 12, 2002
    Date of Patent: October 8, 2002
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder
  • Patent number: 6452814
    Abstract: Zero voltage switching cells using a small magnetic circuit element, a pair of switches, and a capacitor are revealed. The application of the zero voltage switching cells to any of a wide variety of hard switching power converter topologies yields equivalent power converters with zero voltage switching properties, without the requirement that the magnetizing current in the main magnetic energy storage element be reversed during each switching cycle. The new switching cells either provide integral line filtering or a means to accomplish zero voltage switching with no high side switch drive mechanism. In the subject invention the energy required to drive the critical zero voltage switching transition is provided by the small magnetic circuit element, either a single winding choke or a two winding coupled choke, that forms part of the zero voltage switching cell. The application of the zero voltage switching cells to buck, buck boost, Cuk, flyback, and forward converters is shown.
    Type: Grant
    Filed: September 19, 2001
    Date of Patent: September 17, 2002
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder
  • Publication number: 20020121881
    Abstract: Five circuit synthesis methods, for forming new power conversion circuits with enhanced electromagnetic compatibility and improved AC performance from old circuits with AC performance and/or electromagnetic compatibility deficiencies, are revealed. The new synthesis methods achieve performance improvements without requiring the addition of magnetic cores. In all cases a simple toroidal magnetic core structure is not precluded. In all cases splitting or adding magnetic windings is required, and, in many cases, additional capacitors are required. Many new circuits formed by applying the synthesis methods are revealed. The results achieved by application of the synthesis methods include zero ripple current at all terminals without adding magnetic cores or requiring a complex magnetic circuit element, cancellation of common mode currents, improved control loop bandwidth, and faster transient response.
    Type: Application
    Filed: September 4, 2001
    Publication date: September 5, 2002
    Inventor: Ernest H. Wittenbreder
  • Patent number: 6437999
    Abstract: PWM DC to DC converter circuits which accomplish ripple cancellation at one or more terminals are revealed. Four or more inductors are required in each case, however, in all cases multiple inductors can be combined into a single simple coupled inductor to accomplish the ripple cancellation. Some of the circuits revealed accomplish ripple cancellation at all terminals and some also provide zero voltage switching and galvanic load isolation. The non-isolated DC to DC converter networks revealed accomplish buck, boost, buck boost (flyback), buck complement, boost complement, or flyback complement conversion using a simple circuit requiring only two switches, one of which may be a simple diode rectifier, two or more capacitors, and four or more inductors, which may be co-located on a single common magnetic core. The isolated converters revealed provide continuous and discontinuous forward converter and continuous flyback converter transfer functions.
    Type: Grant
    Filed: May 12, 2001
    Date of Patent: August 20, 2002
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder
  • Publication number: 20010036088
    Abstract: A highly efficient and simple power conversion circuit (300) having zero voltage switching (ZVS) includes a novel switch timing technique, such that the need for an leakage inductor connected in series with the primary circuit of the converter and rectifier diodes is eliminated. A switch timing circuit (351) located in an output side circuit (350) enables the use of the natural stored magnetic energy in the output side circuit (350) to drive the critical switching transitions to accomplish soft switching for all of the switches (314-317) in a full bridge forward converter (300) for all transitions. This power conversion circuit (300) includes a full bridge circuit (310) having plurality of switching devices (314-317) that intermittently couple the primary winding (327) to the input of the power converter (300). A transformer (326) couples to receive power from the full bridge circuit (310) into its primary winding (327).
    Type: Application
    Filed: May 4, 2001
    Publication date: November 1, 2001
    Inventor: Ernest H. Wittenbreder
  • Patent number: 6304065
    Abstract: Three terminal PWM DC to DC converter networks which accomplish both non-pulsating input and non-pulsating output currents using a single simple coupled inductor is revealed. The DC to DC converter networks accomplish buck, boost, buck boost (flyback), buck complement, boost complement, or flyback complement (SEPIC) conversion using a simple circuit requiring only two switches, one of which may be a simple diode rectifier, one or two capacitors, and three or four inductors, which may be co-located on a single common magnetic core. Also revealed are techniques to accomplish isolation, high order (quadrature) transfer functions, methodology for reducing current ripple to near zero levels at all terminals simultaneously, and methodology for generalizing the process of changing three terminal networks with pulsating terminal currents into three terminal networks with non-pulsating terminal currents.
    Type: Grant
    Filed: March 2, 2001
    Date of Patent: October 16, 2001
    Assignee: Technical Witts, Inc.
    Inventor: Ernest H. Wittenbreder