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1.发明申请公开(公告)号：US20190229626A1
公开(公告)日：2019-07-25
申请号：US15950270
申请日：2018-04-11
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: A flyback converter can include an auxiliary winding magnetically coupled to the secondary (output) for sensing a reflected output voltage. A controller can operate a power switch of the flyback converter in a burst mode to deliver a number of pulses, causing the output voltage to reach a threshold, and thereafter suspend switching for a predetermined time period before delivering a further number of pulses. The delivered number of pulses can be counted, and, responsive to a determination that the count is less than a predetermined minimum number of pulses, the predetermined time period can be increased. Responsive to a determination that the count is greater than a predetermined maximum number of pulses, the predetermined time period can be decreased.
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2.发明授权公开(公告)号：US10250149B2
公开(公告)日：2019-04-02
申请号：US15829253
申请日：2017-12-01
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: Systems and methods for operating improved flyback converters are disclosed, in which leakage energy is returned to the input power source rather than to the output load, while still achieving zero voltage switching (i.e., ZVS) operation. In some embodiments, the improved converters may transfer the energy stored in the leakage inductance to a snubber capacitor(s) at the instant of turning off of the control switch. Further, the improved converter embodiments may also retain the stored energy in the snubber capacitor(s) when the power is being delivered to the load by the secondary circuits. The improved converter embodiments may start the transfer of leakage energy stored in the snubber capacitor(s) to the primary winding once the energy stored in the transformer is delivered to the load. Finally, the improved converter embodiments may intelligently control their active clamp switches such that all leakage inductance energy is returned to the input source.
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3.发明授权公开(公告)号：US09893636B2
公开(公告)日：2018-02-13
申请号：US15585715
申请日：2017-05-03
Applicant: Apple Inc.
Inventor： Vijay Phadke
CPC classification number: H02M3/33546 , H02M1/34 , H02M3/335 , H02M3/33523 , H02M3/33569 , H02M2001/0009 , H02M2001/0058 , H02M2001/342 , Y02B70/1433 , Y02B70/1491
Abstract: Systems and methods for operating improved flyback converters are disclosed, in which leakage energy is returned to the input power source rather than to the output load, while still achieving zero voltage switching (i.e., ZVS) operation. In some embodiments, the improved converters may transfer the energy stored in the leakage inductance to a snubber capacitor(s) at the instant of turning off of the control switch. Further, the improved converter embodiments may also retain the stored energy in the snubber capacitor(s) when the power is being delivered to the load by the secondary circuits. The improved converter embodiments may start the transfer of leakage energy stored in the snubber capacitor(s) to the primary winding once the energy stored in the transformer is delivered to the load. Finally, the improved converter embodiments may intelligently control their active clamp switches such that all leakage inductance energy is returned to the input source.
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4.发明授权公开(公告)号：US09774270B2
公开(公告)日：2017-09-26
申请号：US15042885
申请日：2016-02-12
Applicant: Apple Inc.
Inventor： Vijay Phadke
CPC classification number: H02M3/33546 , H02M1/34 , H02M3/335 , H02M3/33523 , H02M3/33569 , H02M2001/0009 , H02M2001/0058 , H02M2001/342 , Y02B70/1433 , Y02B70/1491
Abstract: Systems and methods for operating improved flyback converters are disclosed, in which leakage energy is returned to the input power source rather than to the output load, while still achieving zero voltage switching (i.e., ZVS) operation. In some embodiments, the improved converters may transfer the energy stored in the leakage inductance to a snubber capacitor(s) at the instant of turning off of the control switch. Further, the improved converter embodiments may also retain the stored energy in the snubber capacitor(s) when the power is being delivered to the load by the secondary circuits. The improved converter embodiments may start the transfer of leakage energy stored in the snubber capacitor(s) to the primary winding once the energy stored in the transformer is delivered to the load. Finally, the improved converter embodiments may intelligently control their active clamp switches such that all leakage inductance energy is returned to the input source.
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公开(公告)号：US20200076291A1
公开(公告)日：2020-03-05
申请号：US16209633
申请日：2018-12-04
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: Disclosed herein are synchronous rectifier control techniques for Discontinuous Current Mode (DCM) converters. These techniques may be particularly advantageous where the current shape is triangular in nature with a fixed down-slope. Such converters may include DCM flyback converters and DCM buck converters. The proposed control techniques can reduce body diode conduction of the synchronous rectifier and optimize turn-off timing, while negating the effect of parasitic circuit elements. These techniques may also help simplify the control of synchronous rectifiers operated in parallel mode. Finally, such techniques may also help achieve higher performance in variable output voltage converters and converters that operate at high switching frequencies.
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Patent Agency Ranking
公开(公告)号：US20220149714A1
公开(公告)日：2022-05-12
申请号：US17648962
申请日：2022-01-26
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: Disclosed herein are synchronous rectifier control techniques for Discontinuous Current Mode (DCM) converters. These techniques may be particularly advantageous where the current shape is triangular in nature with a fixed down-slope. Such converters may include DCM flyback converters and DCM buck converters. The proposed control techniques can reduce body diode conduction of the synchronous rectifier and optimize turn-off timing, while negating the effect of parasitic circuit elements. These techniques may also help simplify the control of synchronous rectifiers operated in parallel mode. Finally, such techniques may also help achieve higher performance in variable output voltage converters and converters that operate at high switching frequencies.
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7.发明授权公开(公告)号：US10770977B2
公开(公告)日：2020-09-08
申请号：US16366611
申请日：2019-03-27
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: Systems and methods for operating improved flyback converters are disclosed, in which leakage energy is returned to the input power source rather than to the output load, while still achieving zero voltage switching (i.e., ZVS) operation. In some embodiments, the improved converters may transfer the energy stored in the leakage inductance to a snubber capacitor(s) at the instant of turning off of the control switch. Further, the improved converter embodiments may also retain the stored energy in the snubber capacitor(s) when the power is being delivered to the load by the secondary circuits. The improved converter embodiments may start the transfer of leakage energy stored in the snubber capacitor(s) to the primary winding once the energy stored in the transformer is delivered to the load. Finally, the improved converter embodiments may intelligently control their active clamp switches such that all leakage inductance energy is returned to the input source.
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公开(公告)号：US10770965B2
公开(公告)日：2020-09-08
申请号：US16365100
申请日：2019-03-26
Applicant: Apple Inc.
Inventor： Marco A. Davila , Joao L. Andres , Bogdan T. Bucheru , Vijay Phadke
Abstract: This disclosure describes a flyback converter with a series-parallel mode (SPM) active clamp. The active clamp, coupled in parallel with the primary coil, may include a clamp switch, two or more snubber capacitors, and associated diodes. The active clamp may be configured to absorb and retain the leakage energy from the leakage inductance of the flyback converter. The clamp switch may be turned on selectively as the primary switch approaches one of a plurality peak values to adjust frequencies of the switching devices. With the active clamp circuit, the flyback converter may first re-capture the leakage energy in the active clamp circuit and then recover it back to the power source.
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9.发明申请公开(公告)号：US20200021199A1
公开(公告)日：2020-01-16
申请号：US16578514
申请日：2019-09-23
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: Systems and methods for operating improved flyback converters are disclosed, in which leakage energy is returned to the input power source rather than to the output load, while still achieving zero voltage switching (i.e., ZVS) operation. In some embodiments, the improved converters may transfer the energy stored in the leakage inductance to a snubber capacitor(s) at the instant of turning off of the control switch. Further, the improved converter embodiments may also retain the stored energy in the snubber capacitor(s) when the power is being delivered to the load by the secondary circuits. The improved converter embodiments may start the transfer of leakage energy stored in the snubber capacitor(s) to the primary winding once the energy stored in the transformer is delivered to the load. Finally, the improved converter embodiments may intelligently control their active clamp switches such that all leakage inductance energy is returned to the input source.
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10.发明授权公开(公告)号：US10511230B2
公开(公告)日：2019-12-17
申请号：US15950270
申请日：2018-04-11
Applicant: Apple Inc.
Inventor： Vijay Phadke
Abstract: A flyback converter can include an auxiliary winding magnetically coupled to the secondary (output) for sensing a reflected output voltage. A controller can operate a power switch of the flyback converter in a burst mode to deliver a number of pulses, causing the output voltage to reach a threshold, and thereafter suspend switching for a predetermined time period before delivering a further number of pulses. The delivered number of pulses can be counted, and, responsive to a determination that the count is less than a predetermined minimum number of pulses, the predetermined time period can be increased. Responsive to a determination that the count is greater than a predetermined maximum number of pulses, the predetermined time period can be decreased.
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