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公开(公告)号：US20200251465A1
公开(公告)日：2020-08-06
申请号：US16264065
申请日：2019-01-31
摘要： A system includes a clamp network coupled between an input and an output and configured to clamp a voltage between the input and the output to a first clamp voltage based on the presence of a trigger signal and to a second clamp voltage based on the absence of the trigger signal. The second clamp voltage is greater than the first clamp voltage and the first clamp voltage is less than a breakdown voltage of the power transistor device. A detector circuit is coupled to the input and the output. A power transistor device may also be coupled between the input and the output. The detector circuit is configured to detect a pulse signal at the input or the output while the power transistor device is off and to generate the trigger signal for a time interval based on detecting the pulse signal.
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公开(公告)号：US20180109179A1
公开(公告)日：2018-04-19
申请号：US15296733
申请日：2016-10-18
发明人： XIAOCHUN ZHAO , HASIBUR RAHMAN , ARTUR LEWINSKI , Tulong Yang
IPC分类号： H02M3/07
CPC分类号： H02M3/07 , H02M3/1582 , H03K2217/0081
摘要： A circuit includes a charge pump to generate an output reference voltage. A first bootstrap refresh circuit receives the reference voltage from the charge pump and is coupled between first and second bootstrap nodes of a DC/DC converter. The first bootstrap refresh circuit supplies first charge current that is sourced from the first bootstrap node to the second bootstrap node based on a control signal indicating a first operating mode of the DC/DC converter. A second bootstrap refresh circuit receives the reference voltage from the charge pump and is coupled between the first and second bootstrap nodes of the DC/DC converter. The second bootstrap refresh circuit supplies second charge current from the second bootstrap node to the first bootstrap node based on the control signal indicating a second operating mode of the DC/DC converter.
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公开(公告)号：US20180109186A1
公开(公告)日：2018-04-19
申请号：US15296839
申请日：2016-10-18
CPC分类号： H02M3/158 , H02M1/08 , H02M2001/0009 , H02M2001/0032 , H02M2003/1566
摘要： One example includes a switching power supply. The switching power supply includes a power stage, a feedback loop, and a simulated feedback error generator. The power stage provides an output signal in response to a switching signal. The feedback loop monitors the output signal and provides a feedback error signal to adjust the switching signal to regulate the output signal. The simulated feedback error generator temporarily provides a simulated feedback error signal during a transition period from the low power mode to a high power mode of the switching power supply until the feedback loop has enough time to provide the feedback error signal.
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公开(公告)号：US20180018012A1
公开(公告)日：2018-01-18
申请号：US15212535
申请日：2016-07-18
摘要： One example includes a power control system. The power control system includes an activation controller that is powered via a first power voltage generated via a first power supply and is configured to provide an enable signal. The activation controller can assert the enable signal in response to an input activation signal to control activation of a second power supply. The second power supply can generate a second power voltage in response to the enable signal being asserted. The second power voltage can be provided to regulate power associated with ancillary electronic circuitry. The system also includes a deactivation controller that is powered via the second power voltage and is configured to generate a disable signal to de-assert the enable signal in response to one of a plurality of predetermined deactivation conditions.
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