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公开(公告)号：US10270354B1
公开(公告)日：2019-04-23
申请号：US16044952
申请日：2018-07-25
发明人： Bing Lu , Bharath Balaji Kannan
摘要： A synchronous rectifier controller integrated circuit. The synchronous rectifier controller integrated circuit comprises a continuous current mode (CCM) detection circuit configured to detect CCM operation based on sensing a voltage at a pre-defined point in a rectification cycle; a multiplexer having a first reference voltage signal input, a second reference voltage signal input, an output, and a selector input coupled to the CCM detection circuit; and a gate voltage driver circuit coupled to the output of the multiplexer.
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公开(公告)号：US09985534B2
公开(公告)日：2018-05-29
申请号：US15414420
申请日：2017-01-24
CPC分类号： H02M3/33507 , H02M2001/0019 , H02M2001/0032 , Y02B70/16
摘要： Methods of operating switching power supplies are disclosed. A power supply has a transformer and a switch coupled to the primary side of the transformer for controlling the current flow through the primary side of the transformer. A method includes determining the output voltage of the power supply. A first minimum switching frequency is generated for driving the switch in response to the output voltage being greater than a nominal output voltage and less than a predetermined voltage. A second minimum switching frequency is generated for driving the switch in response to the output voltage being equal to or greater than the predetermined voltage, wherein the first minimum switching frequency is greater than the second minimum switching frequency.
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公开(公告)号：US11646669B2
公开(公告)日：2023-05-09
申请号：US17399004
申请日：2021-08-10
发明人： Bharath Balaji Kannan , Bing Lu
CPC分类号： H02M3/33592 , H02M1/08 , H02M1/0009 , H02M1/0032
摘要： Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.
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公开(公告)号：US20210408928A1
公开(公告)日：2021-12-30
申请号：US17399004
申请日：2021-08-10
发明人： Bharath Balaji Kannan , Bing Lu
摘要： Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.
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公开(公告)号：US11201603B2
公开(公告)日：2021-12-14
申请号：US16905469
申请日：2020-06-18
摘要： In some examples, a circuit includes an input circuit, an output circuit, an auxiliary circuit, and a balancing circuit. The input circuit comprises a primary capacitor coupled to primary windings of a transformer. The output circuit comprises a secondary capacitor coupled to secondary windings of the transformer, wherein the secondary windings are coupled to the primary windings. The auxiliary circuit comprises auxiliary windings coupled to the primary windings. The balancing circuit is coupled to the output circuit, the auxiliary circuit, and the input circuit. The balancing circuit is configured to balance a voltage across the primary capacitor with a voltage across the secondary capacitor.
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公开(公告)号：US11128224B2
公开(公告)日：2021-09-21
申请号：US16052444
申请日：2018-08-01
发明人： Bharath Balaji Kannan , Bing Lu
摘要： Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.
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7.发明公开公开(公告)号：US20240258927A1
公开(公告)日：2024-08-01
申请号：US18160374
申请日：2023-01-27
IPC分类号： H02M3/335 , B60L53/22 , H02M1/08 , H02M7/5387 , H02P27/06
CPC分类号： H02M3/335 , B60L53/22 , H02M1/08 , H02M7/5387 , H02P27/06 , B60L2210/10
摘要： A DC-to-DC converter having primary- and secondary-side circuitry separated by an isolation barrier, with a transformer and a feedback lane across the barrier, uses a dynamic function current source in its secondary-side circuitry to dynamically adjust the hysteresis threshold only at the transformer burst turn-off edge to provide enhanced immunity to transformer switching noise. An output voltage of the converter (or signal based thereon) is compared to the threshold to provide an input to a timing pulse generator that closes a switch to couple the dynamic function current source into voltage threshold setting circuitry. The dynamic function current source can reduce the threshold to a level that avoids chattering in transformer burst turn-off feedback signal caused by the noise, for a duration that can be based on lane delay of the converter and to an amplitude that can be based on the expected maximum negative amplitude of the noise.
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公开(公告)号：US20200036293A1
公开(公告)日：2020-01-30
申请号：US16052444
申请日：2018-08-01
发明人： Bharath Balaji Kannan , Bing Lu
摘要： Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.
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公开(公告)号：US11955896B2
公开(公告)日：2024-04-09
申请号：US17686376
申请日：2022-03-03
CPC分类号： H02M3/33523 , G06F1/266 , G06F13/4282 , H02M1/08 , H05B45/37 , G06F2213/0042 , H02M1/0009 , H02M1/0032
摘要： A system includes an isolated converter having a power transformer with a primary winding, a secondary winding, and an auxiliary winding. The system also includes: 1) a first switch coupled to the primary winding; 2) a switch controller coupled to the first switch; and 3) a bias power regulator circuit coupled to the auxiliary winding and the switch controller. The bias power regulator circuit includes a second switch. The bias power regulator circuit is configured to provide a bias supply output voltage to the switch controller based on a first set of modes that modulate a switching frequency of the second switch and based on a second mode in which the second switch stays off.
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公开(公告)号：US11271483B2
公开(公告)日：2022-03-08
申请号：US16596954
申请日：2019-10-09
摘要： A system includes an isolated converter having a power transformer with a primary winding, a secondary winding, and an auxiliary winding. The system also includes: 1) a first switch coupled to the primary winding; 2) a switch controller coupled to the first switch; and 3) a bias power regulator circuit coupled to the auxiliary winding and the switch controller. The bias power regulator circuit includes a second switch. The bias power regulator circuit is configured to provide a bias supply output voltage to the switch controller based on a first set of modes that modulate a switching frequency of the second switch and based on a second mode in which the second switch stays off.
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