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公开(公告)号：US11984799B2
公开(公告)日：2024-05-14
申请号：US17572607
申请日：2022-01-10
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
Abstract: A dual-path active damper reduces power losses while damping ringing waveforms in resonant circuits. One path clamps the peak value of a node voltage at less than a rated voltage of a protected device while allowing the node voltage to ring and decay naturally. Another path waits for some delay after the peak value is clamped until closing an active switch to draw a reset current through an RC snubber to actively dampen the ringing of the node voltage. The delay and on-time of the active switch are set to reduce or even minimize power losses for damping the ringing waveform within a specified period.
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公开(公告)号：US11979084B2
公开(公告)日：2024-05-07
申请号：US17893495
申请日：2022-08-23
Applicant: Raytheon Company
Inventor： Sriram Chandrasekaran , Bruce Stoltz , Marty Perry , Noel Delgado
CPC classification number: H02M1/325 , H02M1/0009 , H02M1/0087 , H02M1/34 , H02M3/28 , H02M3/33573 , H02M3/33592
Abstract: An isolated DC/DC converter includes a primary stage, a transformer circuit, a secondary stage, an active clamp, a first current sense node, and a second current sense node. The primary stage includes a primary switching inverter configured to invert the source DC voltage into a high-frequency alternating current (AC) voltage. The transformer circuit adjusts an AC voltage level of the high-frequency AC voltage and outputs an adjusted AC voltage. The secondary stage includes a secondary switching converter to convert the adjusted AC voltage into a secondary voltage, and the active clamp is configured to clamp the secondary voltage to provide an output DC voltage. The first current sense node is included in the primary stage conducts a source current having a first current level, and the second current sense node is included in the secondary stage and conducts a clamp current having a second current level.
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公开(公告)号：US20240072641A1
公开(公告)日：2024-02-29
申请号：US17893495
申请日：2022-08-23
Applicant: Raytheon Company
Inventor： Sriram Chandrasekaran , Bruce Stoltz , Marty Perry , Noel Delgado
CPC classification number: H02M1/325 , H02M1/0009 , H02M1/0087 , H02M3/28
Abstract: An isolated DC/DC converter includes a primary stage, a transformer circuit, a secondary stage, an active clamp, a first current sense node, and a second current sense node. The primary stage includes a primary switching inverter configured to invert the source DC voltage into a high-frequency alternating current (AC) voltage. The transformer circuit adjusts an AC voltage level of the high-frequency AC voltage and outputs an adjusted AC voltage. The secondary stage includes a secondary switching converter to convert the adjusted AC voltage into a secondary voltage, and the active clamp is configured to clamp the secondary voltage to provide an output DC voltage. The first current sense node is included in the primary stage conducts a source current having a first current level, and the second current sense node is included in the secondary stage and conducts a clamp current having a second current level.
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公开(公告)号：US11705823B2
公开(公告)日：2023-07-18
申请号：US17546642
申请日：2021-12-09
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
IPC: H02M3/335
CPC classification number: H02M3/33592
Abstract: A topology for double-ended dual magnetic DC-DC SPC (“Voltage Doubler”) for all else being equal provides twice the output voltage as the conventional topology. The Voltage Doubler differs in that the secondary configuration is stacked in series as compared to the conventional topology in which the secondary configuration of the dual magnetics are in parallel. The output current is AC coupled rather than DC coupled to the load thereby doubling the output voltage. Because of the AC coupling, the Voltage Doubler is configured to automatically maintain balance of the secondary capacitors. During reset of the magnetics, the primary windings are shorted and both synchronous rectifier switches are closed. Due to transformer action, the output capacitors are connected to the output such that charge equalization forces the voltage on each capacitor to be equal.
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公开(公告)号：US10924020B1
公开(公告)日：2021-02-16
申请号：US16527897
申请日：2019-07-31
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
Abstract: The present invention provides a prestart control circuit that measures a reflected voltage on the primary side of a switching power converter. The prestart control circuit pulses the synchronous rectifier switch OPEN and CLOSED, which allows a measurement of the reflected voltage on the primary side of the switching power converter. The reflected voltage is proportionate to the output voltage of the switching power converter. The prestart control circuit uses the reflected voltage to establish the initial duty cycle of the switching power converter. The switching power converter may be any converter that includes a synchronous rectifier, such as a flyback converter or a forward converter, in a single-ended, double-ended and/or multi-phased configuration.
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Patent Agency Ranking
公开(公告)号：US20210036621A1
公开(公告)日：2021-02-04
申请号：US16527897
申请日：2019-07-31
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
Abstract: The present invention provides a prestart control circuit that measures a reflected voltage on the primary side of a switching power converter. The prestart control circuit pulses the synchronous rectifier switch OPEN and CLOSED, which allows a measurement of the reflected voltage on the primary side of the switching power converter. The reflected voltage is proportionate to the output voltage of the switching power converter. The prestart control circuit uses the reflected voltage to establish the initial duty cycle of the switching power converter. The switching power converter may be any converter that includes a synchronous rectifier, such as a flyback converter or a forward converter, in a single-ended, double-ended and/or multi-phased configuration.
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公开(公告)号：US12068692B2
公开(公告)日：2024-08-20
申请号：US17694338
申请日：2022-03-14
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
CPC classification number: H02M3/1584 , H02M1/0009 , H02M1/36
Abstract: A multi slope output impedance controller is configured to vary the effective impedance Zeff_n of a power converter to reduce a current imbalance between power supplies in a masterless configuration of N parallel-connected power supplies while maintaining load regulation during start-up and steady-state operation. Generally speaking, the controller commands a high value of Zeff_n when Iout_n is low to facilitate current sharing and reduce current imbalance Ib between the power supplies and commands a low value of Zeff_n when Iout_n is high to improve load regulation.
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8.发明公开公开(公告)号：US20230188048A1
公开(公告)日：2023-06-15
申请号：US17546642
申请日：2021-12-09
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
IPC: H02M3/335
CPC classification number: H02M3/33592
Abstract: A topology for double-ended dual magnetic DC-DC SPC (“Voltage Doubler”) for all else being equal provides twice the output voltage as the conventional topology. The Voltage Doubler differs in that the secondary configuration is stacked in series as compared to the conventional topology in which the secondary configuration of the dual magnetics are in parallel. The output current is AC coupled rather than DC coupled to the load thereby doubling the output voltage. Because of the AC coupling, the Voltage Doubler is configured to automatically maintain balance of the secondary capacitors. During reset of the magnetics, the primary windings are shorted and both synchronous rectifier switches are closed. Due to transformer action, the output capacitors are connected to the output such that charge equalization forces the voltage on each capacitor to be equal.
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公开(公告)号：US20230188029A1
公开(公告)日：2023-06-15
申请号：US17572607
申请日：2022-01-10
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
CPC classification number: H02M1/15 , H02M3/158 , H02M1/344 , H02M3/33576
Abstract: A dual-path active damper reduces power losses while damping ringing waveforms in resonant circuits. One path clamps the peak value of a node voltage at less than a rated voltage of a protected device while allowing the node voltage to ring and decay naturally. Another path waits for some delay after the peak value is clamped until closing an active switch to draw a reset current through an RC snubber to actively dampen the ringing of the node voltage. The delay and on-time of the active switch are set to reduce or even minimize power losses for damping the ringing waveform within a specified period.
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公开(公告)号：US10418905B1
公开(公告)日：2019-09-17
申请号：US16202574
申请日：2018-11-28
Applicant: Raytheon Company
Inventor： Marty Perry , Robert J. Schaller
Abstract: A pre-bias control circuit for a switching power converter detects the slope of the output voltage over time and outputs an OPEN command when the slope detected is more NEGATIVE than a pre-defined threshold and a pre-charge current that flows back through the switching power converter has reached a maximum value. In response, the synchronous rectifier switch OPENs overriding the typical control waveform to control the energy from the output voltage from flowing back through the switching power converter. The switching power converter may be any converter that includes a synchronous rectifier, such as a flyback converter, a forward converter, a buck converter, in a single-ended, double-ended and/or multi-phased configuration.
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