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公开(公告)号：US20240079951A1
公开(公告)日：2024-03-07
申请号：US18305248
申请日：2023-04-21
Applicant: Navitas Semiconductor Limited
Inventor： Xiucheng Huang , Mingqiang Li , Weijing Du , Yun Zhou
CPC classification number: H02M1/44 , H02M1/4208 , H02M3/33571 , H05K9/0075
Abstract: Systems and methods for improving radiated electromagnetic interference (EMI) in switching power supplies are disclosed. In one aspect, a converter circuit includes a transformer having a primary winding and a secondary winding, the primary winding extending from a first primary terminal to a second primary terminal, a first switch having a first gate terminal, a first source terminal and a first drain terminal, wherein the first drain terminal is coupled to the first primary terminal, and the first source terminal is coupled to a power source, and a capacitor having a first capacitor terminal and second capacitor terminal, wherein the first capacitor terminal is coupled to the power source. A ferrite bead is coupled between the first primary terminal and the first drain terminal, and a capacitor network is coupled in parallel with the ferrite bead and arranged to reduce radiated electromagnetic interference of the converter circuit.
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公开(公告)号：US20230005659A1
公开(公告)日：2023-01-05
申请号：US17853767
申请日：2022-06-29
Applicant: Navitas Semiconductor Limited
Inventor： Xiucheng Huang , Bin Li , Weijing Du , Yun Zhou
Abstract: Systems and methods for improving winding losses in transformers. In one aspect, a transformer includes a first magnetic core having a first portion in contact with a second magnetic core and a second portion separated from the second magnetic core by a distance d, a plurality of primary windings formed around the second portion, a first secondary winding forming a first layer having a first inner diameter, a second secondary winding forming an nth layer having a second inner diameter. The plurality of primary windings are positioned between the first layer and the nth layer, where the plurality of primary windings, and the first secondary winding and the second secondary winding are formed around the second portion, and a difference between the first inner diameter and the second inner diameter defines a distance y, and a ratio of distance y to distance d is between 0.01 to 10.
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公开(公告)号：US20240048062A1
公开(公告)日：2024-02-08
申请号：US18357051
申请日：2023-07-21
Applicant: Navitas Semiconductor Limited
Inventor： Xiucheng Huang , Yingchuan Lei , Yun Zhou , Weijing Du
CPC classification number: H02M3/33592 , H02M1/0051 , H02M3/33515
Abstract: A low power-loss supply circuit minimizes the losses in a synchronous rectifier power conversion circuit by regulating the voltage supply (Vcc) of a synchronous rectifier controller. The low power-loss supply circuit uses two regulating capacitors to regulate the value of the voltage supplied to the controller. A first regulating capacitor supplies the input voltage which powers the synchronous rectifier controller. A second regulating capacitor is used to cyclically charge the first regulating capacitor.
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公开(公告)号：US11824445B2
公开(公告)日：2023-11-21
申请号：US18150600
申请日：2023-01-05
Applicant: Navitas Semiconductor Limited
Inventor： Victor Sinow , Weijing Du
CPC classification number: H02M3/158 , H02M1/0009 , H02M1/08 , H02M1/4208
Abstract: Systems and methods that automatically detect state of switches in power converters are disclosed. In one aspect, a power switch includes a first switch coupled between a power input node and a first terminal of a load, a second switch coupled between the power input node and a second terminal of the load, first and second current sense devices arranged to transmit first and second signals including at least one of a magnitude and polarity of first and second currents through the first and second switches, respectively, a first driver circuit arranged to transmit first control signals to the first switch based at least in part on a voltage at the power input node and the first signal, and a second driver circuit arranged to transmit second control signals to the second switch based at least in part on the voltage at the power input node and the second signal.
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公开(公告)号：US11575321B2
公开(公告)日：2023-02-07
申请号：US17667335
申请日：2022-02-08
Applicant: Navitas Semiconductor Limited
Inventor： Victor Sinow , Weijing Du
Abstract: Systems and methods that automatically detect state of switches in power converters are disclosed. In one aspect, a power switch includes a first switch coupled between a power input node and a first terminal of a load, a second switch coupled between the power input node and a second terminal of the load, first and second current sense devices arranged to transmit first and second signals including at least one of a magnitude and polarity of first and second currents through the first and second switches, respectively, a first driver circuit arranged to transmit first control signals to the first switch based at least in part on a voltage at the power input node and the first signal, and a second driver circuit arranged to transmit second control signals to the second switch based at least in part on the voltage at the power input node and the second signal.
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公开(公告)号：US20240195313A1
公开(公告)日：2024-06-13
申请号：US18531619
申请日：2023-12-06
Applicant: Navitas Semiconductor Limited
Inventor： Xiucheng Huang , Weijing Du , Yun Zhou
IPC: H02M3/335
CPC classification number: H02M3/33592
Abstract: A circuit. The circuit includes a transformer having a primary winding extending between a first terminal and a second terminal, and a secondary winding extending between a third terminal and a first output terminal, and an auxiliary winding extending between a fourth terminal and the third terminal; a first switch having a first gate terminal, a first source terminal and a first drain terminal, the first drain terminal coupled to the second terminal and the first source terminal coupled to a power source; a second switch having a second gate terminal, a second source terminal and a second drain terminal, the second source terminal coupled to the third terminal and the second drain terminal coupled to a second output terminal, the secondary winding having a winding direction opposite to that of the primary winding and the auxiliary winding having a winding direction same as that of the primary winding.
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7.发明公开
公开(公告)号：US20240195301A1
公开(公告)日：2024-06-13
申请号：US18488952
申请日：2023-10-17
Applicant: Navitas Semiconductor Limited
Inventor： Victor Sinow , Weijing Du
CPC classification number: H02M3/158 , H02M1/0009 , H02M1/08 , H02M1/4208
Abstract: Systems and methods that automatically detect state of switches in power converters are disclosed. In one aspect, a power switch includes a first switch coupled between a power input node and a first terminal of a load, a second switch coupled between the power input node and a second terminal of the load, first and second current sense devices arranged to transmit first and second signals including at least one of a magnitude and polarity of first and second currents through the first and second switches, respectively, a first driver circuit arranged to transmit first control signals to the first switch based at least in part on a voltage at the power input node and the first signal, and a second driver circuit arranged to transmit second control signals to the second switch based at least in part on the voltage at the power input node and the second signal.
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公开(公告)号：US20240162822A1
公开(公告)日：2024-05-16
申请号：US18500009
申请日：2023-11-01
Applicant: Navitas Semiconductor Limited
Inventor： Xiucheng Huang , Weijing Du , Yun Zhou
CPC classification number: H02M3/33571 , H02M1/0058 , H02M3/01 , H02M3/33592
Abstract: Methods of operating a circuit are disclosed. In one aspect, disclosed methods includes providing a power converter circuit having transformer with a primary winding and secondary winding, a first switch and second switch coupled to the primary winding, a third switch coupled to the secondary winding, a controller coupled to the first and second switches. Disclosed methods further includes sensing a turn-on of the third switch and in response, transmitting a turn-on signal to the controller; and turning-on the second switch, using the controller, in response to receiving the turn-on signal. In another aspect, disclosed methods further includes sensing a turn-off of the third switch and in response, transmitting a turn-off signal to the controller using an isolation module, and turning-off the second switch, using the controller, in response to receiving the turn-off signal. In yet another aspect, the second switch is turned-off, using the controller, after a delay time.
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9.发明公开
公开(公告)号：US20230155503A1
公开(公告)日：2023-05-18
申请号：US18150600
申请日：2023-01-05
Applicant: Navitas Semiconductor Limited
Inventor： Victor Sinow , Weijing Du
CPC classification number: H02M3/158 , H02M1/4208 , H02M1/08 , H02M1/0009
Abstract: Systems and methods that automatically detect state of switches in power converters are disclosed. In one aspect, a power switch includes a first switch coupled between a power input node and a first terminal of a load, a second switch coupled between the power input node and a second terminal of the load, first and second current sense devices arranged to transmit first and second signals including at least one of a magnitude and polarity of first and second currents through the first and second switches, respectively, a first driver circuit arranged to transmit first control signals to the first switch based at least in part on a voltage at the power input node and the first signal, and a second driver circuit arranged to transmit second control signals to the second switch based at least in part on the voltage at the power input node and the second signal.
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10.发明申请
公开(公告)号：US20230090234A1
公开(公告)日：2023-03-23
申请号：US17933803
申请日：2022-09-20
Applicant: Navitas Semiconductor Limited
Inventor： Xiucheng Huang , Bin Li , Weijing Du , Yun Zhou
Abstract: A flyback DC-DC converter. The converter having a transformer with a primary and a secondary windings, first and second switches, a capacitor coupled between the second switch and the primary winding, where the second switch is arranged to operate such that a sum of a first and second time periods equals a sum of third and fourth time periods, where the first time period is a delay time period from a time that the first switch is turned off to a time that the second switch is turned on, the second time period is a time period that the second switch is on, the third time period is a resonance time period of a resonator formed by a leakage inductance of the transformer and a capacitance of the capacitor, and the fourth time period is a time period for discharge of the leakage inductance of the transformer into the capacitor.
