公开(公告)号：US20250132554A1

公开(公告)日：2025-04-24

申请号：US18493008

申请日：2023-10-24

Applicant: L3Harris Technologies, Inc.

Inventor： Lixin TANG

IPC: H02H3/16 ,  G01R19/02 ,  G01R19/25

Abstract: In an embodiment, voltage fault detection is performed for alternating current (AC) multi-phase power systems based on a reconstructed or virtual voltage signal derived from voltage samples captured in a shortened sample window to reduce fault detection time. The embodiment of the present disclosure constructs the virtual voltage signal (emulating the root mean square (RMS) voltage of any of the phases) from the voltage samples captured from signals of the multi-phase power system. The embodiment of the present disclosure employs a shortened sample window of T/2/N (N is the number of phases ≥3) to capture the voltage samples, thereby reducing measurement and fault detection delay. The virtual voltage signal is used determine root mean square (RMS) voltage for voltage fault detection.

公开(公告)号：US20250107052A1

公开(公告)日：2025-03-27

申请号：US18475642

申请日：2023-09-27

Applicant: L3Harris Technologies, Inc.

Inventor： Lixin TANG ,  Michael KELLEGHAN

IPC: H05K7/20 ,  H02M3/158

Abstract: An apparatus comprising: a first circuit and a second circuit of a circuit configured to operate in a first mode and a second mode in which the first circuit dissipates more power than the second circuit and the second circuit dissipates more power than the first circuit, respectively; a coolant conduit with a first port and a second port and along which the first circuit and the second circuit are located nearer the first port and the second port, respectively; and a conduit switch network configured to deliver colder coolant to the first port or the second port, depending on which mode is active, such that the colder coolant flows through the coolant conduit and initially encounters whichever of the first circuit and the second circuit dissipates more power, then encounters whichever of the first circuit and the second circuit is not dissipating more power.

公开(公告)号：US20240372463A1

公开(公告)日：2024-11-07

申请号：US18311478

申请日：2023-05-03

Applicant: L3Harris Technologies, Inc.

Inventor： Alexander N. SMITH ,  Lixin TANG ,  Uzzal ISLAM

IPC: H02M1/36 ,  H02M1/00 ,  H02M1/08

Abstract: A method of applying three-phase power to a transformer having limbs including a first limb, a second limb, and a third limb respectively wound with primary windings that include a first winding, a second winding, and a third winding, includes: generating alternating current (AC) voltages (AC voltages) including a first AC voltage, a second AC voltage, and a third AC voltage; initially not applying the AC voltages to the primary windings; monitoring a relative voltage between the first AC voltage and the second AC voltage; and based on results of monitoring, implementing a power-on sequence of sequentially applying various one of the AC voltages to corresponding ones of the primary windings until all of the AC voltages are applied to all of the primary windings in a manner that balances flux across the limbs during and after the power-on sequence.