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公开(公告)号：US20250015721A1
公开(公告)日：2025-01-09
申请号：US18892589
申请日：2024-09-23
Applicant: MSJ SYSTEMS LLC
Abstract: The invention relates to a current-limiting circuit of a flyback converter, and a flyback converter. The converter comprises a power input end, a power output end, a transformer, a rectifier circuit and a switch unit. The current-limiting circuit comprises a first current measurement unit, a second current measurement unit, a first divider, a second divider, a delay unit, a comparison unit and a drive unit. A first input end of the first divider is connected to the second current measurement unit, a second input end of the first divider is used for inputting a target current value, the second divider is connected to the first divider and the delay unit. The comparison unit is connected to the delay unit, the first current measurement unit, and the drive unit, and an output end of the drive unit is used for connecting to a control end of the switch unit.
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公开(公告)号：US20220329163A1
公开(公告)日：2022-10-13
申请号：US17854024
申请日：2022-06-30
Applicant: MSJ SYSTEMS LLC
Abstract: The invention relates to a switching power supply converter, which comprising a transformer including a primary winding and a secondary winding, a power switch circuit and a voltage input circuit, a voltage output circuit, an auxiliary winding, a control circuit, and a voltage sensing circuit; the control circuit performs that in a first turn-off period of the power switch circuit, acquiring a first time duration from a preset delay after the power switch circuit turning off until the sensed voltage corresponding to a preset condition, and acquiring a difference between the first time duration and a preset time duration as a second time duration; in a second turn-off period of the power switch circuit, acquiring the sensed voltage at the time point corresponding to the end of the second time duration starting from the preset delay after the power switch circuit turning off as an effective sample.
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公开(公告)号：US12027984B2
公开(公告)日：2024-07-02
申请号：US17854024
申请日：2022-06-30
Applicant: MSJ SYSTEMS LLC
CPC classification number: H02M3/33507 , H02M1/0041
Abstract: The invention relates to a switching power supply converter, which comprising a transformer including a primary winding and a secondary winding, a power switch circuit and a voltage input circuit, a voltage output circuit, an auxiliary winding, a control circuit, and a voltage sensing circuit; the control circuit performs that in a first turn-off period of the power switch circuit, acquiring a first time duration from a preset delay after the power switch circuit turning off until the sensed voltage corresponding to a preset condition, and acquiring a difference between the first time duration and a preset time duration as a second time duration; in a second turn-off period of the power switch circuit, acquiring the sensed voltage at the time point corresponding to the end of the second time duration starting from the preset delay after the power switch circuit turning off as an effective sample.
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