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公开(公告)号：US11381161B2
公开(公告)日：2022-07-05
申请号：US16851071
申请日：2020-04-16
Applicant: NXP B.V.
Inventor： Suming Lai , Kenneth Chung Yin Kwok , Fuchun Zhan
Abstract: An example method includes controlling a switching order of a plurality of power switches. The power switches are coupled to a flying capacitor and include parasitic bipolar transistors susceptible to the voltage overstress in response to excess stray inductance of the flying capacitor. The method further includes, in response to the controlled switching order, converting an input voltage of a first voltage level to an output voltage of a second voltage level while mitigating the voltage overstress of the parasitic bipolar transistors of the plurality of power switches.
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Patent Agency Ranking
公开(公告)号：US20200177012A1
公开(公告)日：2020-06-04
申请号：US16237732
申请日：2019-01-01
Applicant: NXP B.V.
Inventor： XUECHU LI , Tinghua Yun , Fuchun Zhan
Abstract: In a wireless charging system having a power transmitter (TX) and a power receiver (RX), the RX has a rectifier that rectifies an AC power signal received wirelessly from the TX into a rectified DC power signal. The RX also has regulation modules that monitor the DC power signal at various different voltage regions having one or more different high-voltage regions and one or more different low-voltage regions. Each regulation module affects operations of the wireless charging system in a different way. The regulation modules protect the RX from both over-voltage and under-voltage conditions.
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公开(公告)号：US11165364B2
公开(公告)日：2021-11-02
申请号：US16283845
申请日：2019-02-25
Applicant: NXP B.V.
Inventor： Fuchun Zhan , Tinghua Yun , Jian Qing , Chao Chen , Li Zhang , Feng Cong
Abstract: A synchronous rectifier converts an AC input into a DC output. The synchronous rectifier has four switches controlled by four switch control modules. Each switch is connected between a different AC component and either the DC output or ground. Each switch control module has digitally assisted “switch on” circuitry that detects “on” bounces in the corresponding AC component to control when to turn on the corresponding switch and digitally assisted “switch off” circuitry that detects “off” bounces in the AC component to control when to turn off the corresponding switch. The “switch on” circuitry has a digitally assisted comparator to detect threshold crossings in the AC component, and the “switch off” circuitry has a digitally assisted programmable delay cell to turn off the switch for a predetermined duration following each detected threshold crossing.
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公开(公告)号：US20210257907A1
公开(公告)日：2021-08-19
申请号：US16851071
申请日：2020-04-16
Applicant: NXP B.V.
Inventor： Suming Lai , Kenneth Chung Yin Kwok , Fuchun Zhan
Abstract: An example method includes controlling a switching order of a plurality of power switches. The power switches are coupled to a flying capacitor and include parasitic bipolar transistors susceptible to the voltage overstress in response to excess stray inductance of the flying capacitor. The method further includes, in response to the controlled switching order, converting an input voltage of a first voltage level to an output voltage of a second voltage level while mitigating the voltage overstress of the parasitic bipolar transistors of the plurality of power switches.
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公开(公告)号：US10826482B1
公开(公告)日：2020-11-03
申请号：US16851054
申请日：2020-04-16
Applicant: NXP B.V.
Inventor： Kenneth Chung Yin Kwok , Suming Lai , Xuechu Li , Fuchun Zhan , Jian Qing
IPC: H03K17/00 , H03K17/082 , H01L29/788
Abstract: Aspects of the present disclosure are directed to circuitry to control a gate voltage. As may be implemented in accordance with one or more embodiments, a voltage level is controlled for a field effect transistor (FET) having a floating gate and a target operating voltage above which the FET would be overcharged and around which the FET has a nominal operating range. Pulse circuitry is configured to apply energy to the floating gate in pulses, in operation the applied energy being pulsed low relative to the gate's target operating voltage, and then being changed by adjusting successive pulses until the gate reaches the target operating voltage. A feedback circuit samples a voltage level of, and enables the pulse circuitry to apply pulsed energy to, the floating gate for directing operation of the FET based on the target operating voltage in the nominal operating range.
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公开(公告)号：US10985592B2
公开(公告)日：2021-04-20
申请号：US16237732
申请日：2019-01-01
Applicant: NXP B.V.
Inventor： Xuechu Li , Tinghua Yun , Fuchun Zhan
Abstract: In a wireless charging system having a power transmitter (TX) and a power receiver (RX), the RX has a rectifier that rectifies an AC power signal received wirelessly from the TX into a rectified DC power signal. The RX also has regulation modules that monitor the DC power signal at various different voltage regions having one or more different high-voltage regions and one or more different low-voltage regions. Each regulation module affects operations of the wireless charging system in a different way. The regulation modules protect the RX from both over-voltage and under-voltage conditions.
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