-
公开(公告)号：US12095380B2
公开(公告)日：2024-09-17
申请号：US17972354
申请日：2022-10-24
发明人： Shinji Matsumoto
CPC分类号： H02M3/3385 , H02M3/33507 , H02M1/36
摘要： An integrated circuit for a power supply circuit including a transistor configured to control a current flowing through a coil. The integrated circuit is configured to drive the transistor. The integrated circuit includes: a determination circuit configured to determine whether a predetermined time period has elapsed since a power supply voltage of the integrated circuit rises to a first predetermined level; an oscillator circuit configured to output an oscillator signal, which has a first frequency before lapse of the predetermined period, and changes in a range at least from the first frequency to a second frequency higher than the first frequency after the lapse of the predetermined time period; and a driver circuit configured to switch the transistor responsive to the oscillator signal during and after the predetermined time period, the switching causing an on period of the transistor to gradually increase in the predetermined time period.
-
公开(公告)号：US11735994B2
公开(公告)日：2023-08-22
申请号：US17484508
申请日：2021-09-24
发明人： Shinji Matsumoto , Hiroki Yamane
CPC分类号： H02M1/0003 , H02M3/33523
摘要： An integrated circuit for a power supply circuit that includes a transformer and a transistor. The integrated circuit includes a first terminal receiving a voltage corresponding to a coil voltage across an auxiliary coil of the transformer when the transistor is off, a second terminal receiving a feedback voltage corresponding to an output voltage of the power supply circuit, a third terminal receiving a voltage that corresponds to a current flowing through the transistor and the coil voltage respectively when the transistor is on and off, a detection circuit configured to detect whether the voltage at the third terminal when the transistor is off is lower than a reference voltage, and a control circuit configured to control switching of the transistor based on the feedback voltage, the voltage at the third terminal when the transistor is on, and a detection result of the detection circuit.
-
公开(公告)号：US11563371B2
公开(公告)日：2023-01-24
申请号：US17078281
申请日：2020-10-23
发明人： Shinji Matsumoto
摘要： A switching control circuit for controlling switching of a transistor in a power supply circuit, such that the power supply circuit generates an output voltage at a target level. The switching control circuit includes an overload detection circuit detecting that a load of the power supply circuit is in an overload condition, when a voltage according to the output voltage reaches a predetermined level, an overcurrent detection circuit detecting that a load current is an overcurrent, when a current according to the load current reaches a predetermined value, an adjustment circuit decreasing the predetermined value, when a first time period has elapsed since the load becomes in the overload condition, a drive circuit driving the transistor such that the output voltage reaches the target level, and a control circuit causing the drive circuit to stop driving the transistor, after the load becomes in the overload condition or the load current becomes the overcurrent.
-
公开(公告)号：US11742763B2
公开(公告)日：2023-08-29
申请号：US17183421
申请日：2021-02-24
发明人： Shinji Matsumoto
CPC分类号： H02M3/33569 , H02M1/08 , H02M1/0035
摘要： A power supply circuit generating an output voltage at a target level and applying the output voltage to a load. The power supply circuit includes a transformer including a primary coil, a secondary coil and an auxiliary coil, a transistor coupled to the primary coil, and a switching control circuit configured to control switching of the transistor based on a voltage from the auxiliary coil. The switching control circuit includes a determination circuit configured to determine whether to shift to a burst mode operation based on whether the load is a light load, and a burst control circuit. The burst control circuit has a clock circuit configured to measure a stop period during which the switching of the transistor is stopped in the burst mode operation, and a control circuit configured to, upon detecting that the stop period is longer than a first time period, perform control to decrease the stop period.
-
-
-
搜索结果
4 条记录 (耗时 0.013 秒)
