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Adaptive timing for high frequency inverters

專利號
US11996767B1
公開日期
2024-05-28
申請人
Apple Inc.(US CA Cupertino)
發(fā)明人
Weihong Qiu; Jun Liu; Jizhen Fu; Zaki Moussaoui
IPC分類
H02M1/08; H02J50/10; H02M1/38; H02M7/5387; H02M7/5395
技術領域
dead,switching,inverter,voltage,vsw,comparator,time,gate1,gate2,switch
地域: CA CA Cupertino

摘要

A method of adaptively controlling dead time between turn off of a first switching device of an inverter and turn on of a second switching device of the inverter that is a counterpart of the first switching device can include: monitoring a plurality of switching events of at least one of the first and second switching devices, storing for each monitored switching event an indication whether a dead time associated therewith permitted optimal switching, and adaptively controlling the dead time responsive to the stored indications. Monitoring a plurality of switching events of at least one of the first and second switching devices can further include sampling an output voltage of the inverter and comparing the sampled output voltage to one of a high reference voltage corresponding to a high inverter rail voltage and a low reference voltage corresponding to a low inverter rail voltage.

說明書

In block 764, the control circuitry can determine whether the determined number “n” of monitored switching events has occurred. If not, the counter may be decremented (block 764) and the controller can continue monitoring switching events (block 762) and storing the indications of dead time length (block 763). Otherwise, the controller can check the indications of dead time length (block 766). This check can take a variety of forms, as described in greater detail below. If the check indicates that the deadtime is too long (block 767a), then the control circuitry can decrease the dead time (block 767b), and the process can repeat. If the dead time is too short (block 768a), then the controller can decrease the deadtime (block 768b), and the process can repeat. Otherwise, if the dead time is neither too long nor too short, the process can repeat without increasing or decreasing the dead time.

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