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公开(公告)号：US11539231B1
公开(公告)日：2022-12-27
申请号：US16520036
申请日：2019-07-23
Applicant: Apple Inc.
Inventor： Ashish K. Sahoo , Poornima Mazumdar , Nancy Y. Sun , Zaka Ullah Zahid , Dong Young Lee
Abstract: Aspects of the present disclosure involve a system and method for providing a boosted voltage using a single stage dual active bridge converter. In one embodiment, the single stage dual active bridge converter is introduced for high voltage charging using phase shift and frequency control. Phase shift and frequency control can be implemented on duty cycled switches and pulse width modulated switches in order to achieve a desired output voltage. In another embodiment, the phase shift and frequency controlled single stage dual active bridge converter is replicated in modular form to provide a single-phase system that provides a voltage for charging a high voltage system. In yet another embodiment, the phase shift and frequency controlled single stage dual active bridge converter is replicated in modular form to provide a three-phase system that provides a voltage for charging a high voltage system.
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公开(公告)号：US20200274438A1
公开(公告)日：2020-08-27
申请号：US16445421
申请日：2019-06-19
Applicant: Apple Inc.
Inventor： Bogdan T. Bucheru , Poornima Mazumdar , Marco A. Davila, JR.
Abstract: A leakage energy steering circuit for a flyback converter can include a leakage energy steering capacitor and a leakage energy steering diode configured to be coupled between a first output terminal and a first secondary winding terminal of a flyback converter. The leakage energy steering circuit can further include a reset circuit having an impedance element and a diode configured to be coupled between a junction of the leakage energy steering capacitor and the leakage energy steering diode and a junction of a second secondary winding terminal and a second output terminal of the flyback converter. The impedance element may be a resistor or an inductor.
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公开(公告)号：US10855192B1
公开(公告)日：2020-12-01
申请号：US16538963
申请日：2019-08-13
Applicant: Apple Inc.
Inventor： Zaohong Yang , Marco A. Davila, Jr. , Joao L. Andres , Poornima Mazumdar , Bogdan T. Bucheru
Abstract: A transformer-based switching power converter can include a slew rate limiter coupled to the switching stage and configured to limit rate of change of voltage across one or more switching devices of the switching stage, thereby reducing voltage spikes appearing on the secondary winding. The slew rate limiter may be configured to selectively operate to limit rate of change of voltage across one or more switching devices of the switching stage during startup of the switching stage, upon waking from burst mode, or at any time when zero voltage switching of the one or more switching devices is unavailable. The slew rate limiter can include at least one circuit element configured to selectively alter a time constant of a gate drive circuit of at least one switching device in the switching stage to increase a turn-on transition time of the at least one switching device.
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公开(公告)号：US10389166B1
公开(公告)日：2019-08-20
申请号：US15712795
申请日：2017-09-22
Applicant: Apple Inc.
Inventor： Ashish K. Sahoo , Poornima Mazumdar , Nancy Y. Sun , Zaka Ullah Zahid , Dong Young Lee
Abstract: Aspects of the present disclosure involve a system and method for providing a boosted voltage using a single stage dual active bridge converter. In one embodiment, the single stage dual active bridge converter is introduced for high voltage charging using phase shift and frequency control. Phase shift and frequency control can be implemented on duty cycled switches and pulse width modulated switches in order to achieve a desired output voltage. In another embodiment, the phase shift and frequency controlled single stage dual active bridge converter is replicated in modular form to provide a single-phase system that provides a voltage for charging a high voltage system. In yet another embodiment, the phase shift and frequency controlled single stage dual active bridge converter is replicated in modular form to provide a three-phase system that provides a voltage for charging a high voltage system.
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