Patents by Inventor Martin F. Schlecht
Martin F. Schlecht 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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Publication number: 20160013725Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: ApplicationFiled: September 21, 2015Publication date: January 14, 2016Inventor: Martin F. Schlecht
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Patent number: 9143042Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: GrantFiled: July 22, 2013Date of Patent: September 22, 2015Assignee: SynQor, Inc.Inventor: Martin F. Schlecht
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Publication number: 20140085939Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: ApplicationFiled: July 22, 2013Publication date: March 27, 2014Applicant: SynQor, Inc.Inventor: Martin F. Schlecht
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Patent number: 8644027Abstract: Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.Type: GrantFiled: July 16, 2010Date of Patent: February 4, 2014Assignee: SynQor, Inc.Inventors: Lennart Pitzele, Abram P. Dancy, Leif E. LaWhite, Rene Hemond, Martin F. Schlecht
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Patent number: 8493751Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: GrantFiled: June 10, 2011Date of Patent: July 23, 2013Assignee: Synqor, Inc.Inventor: Martin F. Schlecht
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Publication number: 20130058133Abstract: A dc-dc converter system comprises a quasi-regulated bus converter and plural regulation stages that regulate the output of the bus converter. The bus converter has at least one controlled rectifier with a parallel uncontrolled rectifier. A control circuit controls the controlled rectifier to cause a normally non-regulated mode of operation through a portion of an operating range of source voltage and a regulated output during another portion. The bus converter may be an isolation stage having primary and secondary transformer winding circuits. For the non-regulated output, each primary winding has a voltage waveform with a fixed duty cycle. The fixed duty cycle causes substantially uninterrupted flow of power during non-regulated operation. Inductors at the bus converter input and in a filter at the output of the bus converter may saturate during non-regulated operation.Type: ApplicationFiled: March 30, 2012Publication date: March 7, 2013Applicant: SynQor, Inc.Inventors: Richard W. Farrington, Martin F. Schlecht
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Patent number: 8149597Abstract: A dc-dc converter system comprises a quasi-regulated bus converter and plural regulation stages that regulate the output of the bus converter. The bus converter has at least one controlled rectifier with a parallel uncontrolled rectifier. A control circuit controls the controlled rectifier to cause a normally non-regulated mode of operation through a portion of an operating range of source voltage and a regulated output during another portion. The bus converter may be an isolation stage having primary and secondary transformer winding circuits. For the non-regulated output, each primary winding has a voltage waveform with a fixed duty cycle. The fixed duty cycle causes substantially uninterrupted flow of power during non-regulated operation. Inductors at the bus converter input and in a filter at the output of the bus converter may saturate during non-regulated operation.Type: GrantFiled: August 27, 2010Date of Patent: April 3, 2012Assignee: SynQor, Inc.Inventors: Richard W. Farrington, Martin F. Schlecht
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Publication number: 20110235370Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: ApplicationFiled: June 10, 2011Publication date: September 29, 2011Applicant: SynQor, Inc.Inventor: Martin F. Schlecht
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Patent number: 8023290Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: GrantFiled: June 5, 2009Date of Patent: September 20, 2011Assignee: SynQor, Inc.Inventor: Martin F. Schlecht
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Publication number: 20110187191Abstract: A dc-dc converter system comprises a quasi-regulated bus converter and plural regulation stages that regulate the output of the bus converter. The bus converter has at least one controlled rectifier with a parallel uncontrolled rectifier. A control circuit controls the controlled rectifier to cause a normally non-regulated mode of operation through a portion of an operating range of source voltage and a regulated output during another portion. The bus converter may be an isolation stage having primary and secondary transformer winding circuits. For the non-regulated output, each primary winding has a voltage waveform with a fixed duty cycle. The fixed duty cycle causes substantially uninterrupted flow of power during non-regulated operation. Inductors at the bus converter input and in a filter at the output of the bus converter may saturate during non-regulated operation.Type: ApplicationFiled: August 27, 2010Publication date: August 4, 2011Inventors: Richard W. Farrington, Martin F. Schlecht
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Publication number: 20110176333Abstract: In a power converter, the duty cycle of a primary winding circuit causes near continuous flow of power through the primary and secondary winding circuits during normal operation. By providing no regulation during normal operation, a very efficient circuit is obtained with a synchronous rectifier in the secondary operating at all times. However, during certain conditions such as start up or a short-circuit, the duty cycle of the primary may be reduced to cause freewheeling periods. A normally non-regulating isolation stage may be followed by plural non-isolating regulation stages. To simplify the gate drive, the synchronous rectifiers may be allowed to turn off for a portion of the cycle when the duty cycle is reduced. A filter inductance of the secondary winding circuit is sufficient to minimize ripple during normal operation, but allows large ripple when the duty cycle is reduced. By accepting large ripple during other than normal operation, a smaller filter inductance can be used.Type: ApplicationFiled: October 19, 2010Publication date: July 21, 2011Applicant: SynQor, Inc.Inventors: Martin F. Schlecht, Richard W. Farrington
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Publication number: 20100328912Abstract: Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.Type: ApplicationFiled: July 16, 2010Publication date: December 30, 2010Inventors: Lennart Pitzele, Abram P. Dancy, Leif E. LaWhite, Rene Hemond, Martin F. Schlecht
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Patent number: 7787261Abstract: A dc-dc converter system comprises a quasi-regulated bus converter and plural regulation stages that regulate the output of the bus converter. The bus converter has at least one controlled rectifier with a parallel uncontrolled rectifier. A control circuit controls the controlled rectifier to cause a normally non-regulated mode of operation through a portion of an operating range of source voltage and a regulated output during another portion. The bus converter may be an isolation stage having primary and secondary transformer winding circuits. For the non-regulated output, each primary winding has a voltage waveform with a fixed duty cycle. The fixed duty cycle causes substantially uninterrupted flow of power during non-regulated operation. Inductors at the bus converter input and in a filter at the output of the bus converter may saturate during non-regulated operation.Type: GrantFiled: November 1, 2007Date of Patent: August 31, 2010Assignee: SynQor, Inc.Inventors: Richard W. Farrington, Martin F. Schlecht
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Patent number: 7765687Abstract: Electronics mounted on a printed circuit board are housed within a high conductivity case with connecting pins extending therethrough. The case is filled with thermally conductive potting material to provide thermal conduction from the printed circuit board to the case. The case may be a conduit having open ends through which the printed circuit board is inserted or it may comprise a cover mounted to a base plate.Type: GrantFiled: August 11, 2006Date of Patent: August 3, 2010Assignee: SynQor, Inc.Inventors: Lennart Pitzele, Abram P. Dancy, Leif E. LaWhite, Rene Hemond, Martin F. Schlecht
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Publication number: 20100091526Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: ApplicationFiled: June 5, 2009Publication date: April 15, 2010Inventor: Martin F. Schlecht
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Patent number: 7564702Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: GrantFiled: September 14, 2007Date of Patent: July 21, 2009Assignee: SynQor, Inc.Inventor: Martin F. Schlecht
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Patent number: 7558083Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: GrantFiled: September 10, 2007Date of Patent: July 7, 2009Assignee: SynQor, Inc.Inventor: Martin F. Schlecht
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Publication number: 20080211304Abstract: A dc-dc converter system comprises a quasi-regulated bus converter and plural regulation stages that regulate the output of the bus converter. The bus converter has at least one controlled rectifier with a parallel uncontrolled rectifier. A control circuit controls the controlled rectifier to cause a normally non-regulated mode of operation through a portion of an operating range of source voltage and a regulated output during another portion. The bus converter may be an isolation stage having primary and secondary transformer winding circuits. For the non-regulated output, each primary winding has a voltage waveform with a fixed duty cycle. The fixed duty cycle causes substantially uninterrupted flow of power during non-regulated operation. Inductors at the bus converter input and in a filter at the output of the bus converter may saturate during non-regulated operation.Type: ApplicationFiled: November 1, 2007Publication date: September 4, 2008Applicant: SynQor, Inc.Inventors: Richard W. Farrington, Martin F. Schlecht
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Publication number: 20080175024Abstract: In a power converter, the duty cycle of a primary winding circuit causes near continuous flow of power through the primary and secondary winding circuits during normal operation. By providing no regulation during normal operation, a very efficient circuit is obtained with a synchronous rectifier in the secondary operating at all times. However, during certain conditions such as start up or a short-circuit, the duty cycle of the primary may be reduced to cause freewheeling periods. A normally non-regulating isolation stage may be followed by plural non-isolating regulation stages. To simplify the gate drive, the synchronous rectifiers may be allowed to turn off for a portion of the cycle when the duty cycle is reduced. A filter inductance of the secondary winding circuit is sufficient to minimize ripple during normal operation, but allows large ripple when the duty cycle is reduced. By accepting large ripple during other than normal operation, a smaller filter inductance can be used.Type: ApplicationFiled: September 14, 2007Publication date: July 24, 2008Inventors: Martin F. Schlecht, Richard W. Farrington
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Publication number: 20080151580Abstract: A power converter nearly losslessly delivers energy and recovers energy from capacitors associated with controlled rectifiers in a secondary winding circuit, each controlled rectifier having a parallel uncontrolled rectifier. First and second primary switches in series with first and second primary windings, respectively, are turned on for a fixed duty cycle, each for approximately one half of the switching cycle. Switched transition times are short relative to the on-state and off-state times of the controlled rectifiers. The control inputs to the controlled rectifiers are cross-coupled from opposite secondary transformer windings.Type: ApplicationFiled: September 14, 2007Publication date: June 26, 2008Inventor: Martin F. Schlecht