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公开(公告)号：US12068696B2
公开(公告)日：2024-08-20
申请号：US17447913
申请日：2021-09-16
CPC分类号： H02M3/33592 , H02M1/08
摘要： Operation of a switching power converter, such as to reduce voltage spikes on the secondary side of switching power converters. One example is a method of operating a switching power converter, the method comprising: sensing, by a controller of a switching power converter, a strength-selection signal; and driving, by the controller within a plurality of switching cycles, a control input of a primary electrically-controlled switch, the driving in each switching cycle at a drive strength based on the strength-selection signal.
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公开(公告)号：US10756635B2
公开(公告)日：2020-08-25
申请号：US16032323
申请日：2018-07-11
发明人： Ajay Karthik Hari
摘要： Peak primary current control on the secondary side. In a power converter having a primary side and a secondary side separated by a main transformer, example methods include: driving primary current through a primary winding of the main transformer; creating, on the secondary side of the main transformer, a signal indicative of current through the primary winding of the main transformer; and ceasing the driving of primary current through the primary winding when the signal indicative of primary current reaches a predetermined value.
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公开(公告)号：US12003171B2
公开(公告)日：2024-06-04
申请号：US17659250
申请日：2022-04-14
CPC分类号： H02M1/4225 , H02M1/32 , H02M1/44
摘要： During a light load (or no-load) operation of a totem pole power factor correction circuit (i.e., PFC), a pulse width modulation (PWM) controller can operate in a skip mode. Further, the PWM controller may disable portions of the PFC to reduce standby power consumption. In this mode, and in this disabled configuration, the output of the PFC may be peak charged over time to a voltage that could be damaging or destructive. This peak charging results from the PFC circuit's inability to fully charge/discharge EMI capacitors between half cycles of the input line voltage. The present disclosure provides circuits and methods to fully charge/discharge the EMI capacitors to prevent peak charging the output.
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公开(公告)号：US11527950B2
公开(公告)日：2022-12-13
申请号：US16794820
申请日：2020-02-19
摘要： According to an aspect, a power supply system includes a plurality of power converters configured to deliver a system load current to a load, where the system load current is a combination of individual load currents provided by the plurality of power converters, and a system performance controller configured to detect a value of the system load current. The system performance controller is configured to determine, using power loss information, values for the individual load currents such that a composite efficiency achieves a threshold condition. The system performance controller is configured to generate control signals to operate the plurality of power converters at the determined values.
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公开(公告)号：US11121644B2
公开(公告)日：2021-09-14
申请号：US16547803
申请日：2019-08-22
摘要： According to an aspect, a power supply system includes a plurality of power stages configured to receive an input voltage and generate an output voltage, and a system host device connected to the plurality of power stages. The system host device includes a system performance controller configured to set or update one or more control parameters for controlling the plurality of power stages using overall energy conversion efficiency. The system host device includes an efficiency computation circuit configured to compute the overall energy conversion efficiency based on measured conditions, and a control manipulation module configured to modify the one or more control parameters until the overall energy conversion efficiency achieves a threshold condition.
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公开(公告)号：US10461632B1
公开(公告)日：2019-10-29
申请号：US16373793
申请日：2019-04-03
摘要： Bridgeless PFC converters. Example embodiments are methods of operating a power converter including operating the power converter during a positive half-line cycle of an alternating current (AC) source by: charging an inductance through a low-side switch with a first charging current having a first polarity; measuring the first charging current using a low-side current transformer (CT), while shorting a secondary winding of a high-side CT; and discharging the inductance through a high-side switch with a first discharging current having the first polarity. Operating the power converter during a negative half-line cycle of the AC source by: charging the inductance through the high-side switch with a second charging current having a second polarity; measuring the second charging current using the high-side CT, while shorting a secondary winding of the low-side CT; and discharging the inductance through the low-side switch with a second discharging current having the second polarity.
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公开(公告)号：US11258374B2
公开(公告)日：2022-02-22
申请号：US16547793
申请日：2019-08-22
摘要： According to an aspect, a power supply system includes a power stage, a power supply controller configured to control operations of the power stage, a metering circuit configured to sense measured conditions of the power stage, and a system performance controller configured to be coupled to the power supply controller and the metering circuit. The system performance controller is configured to set or adjust a control parameter for the power stage based on standby power of the power stage. The system performance controller includes a standby power computation circuit configured to compute the standby power of the power stage based on the measured conditions, and a control manipulation module configured to modify the control parameter until the standby power achieves a threshold condition.
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公开(公告)号：US10797581B1
公开(公告)日：2020-10-06
申请号：US16547781
申请日：2019-08-22
摘要： According to an aspect, a power supply system includes a power stage including a power switch and an inductor, a power supply controller connected to the power stage, a metering circuit configured to sense measured conditions of the power stage, and a system performance controller configured to be coupled to the power supply controller and the metering circuit. The system performance controller is configured to compute an energy conversion efficiency based on the measured conditions and select a value for a zero voltage switching (ZVS) control parameter that results in the energy conversion efficiency achieving a threshold condition. The ZVS control parameter indicates a magnitude of a reverse current through the inductor to discharge a parasitic capacitance of the power switch.
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公开(公告)号：US10050536B2
公开(公告)日：2018-08-14
申请号：US15227822
申请日：2016-08-03
摘要： A power converter has a power transistor and inductor coupled in a conduction path with the power transistor. A switching frequency of the power transistor is reduced during a light load condition. A pulse width of a drive signal to the power transistor is controlled to select a current through the inductor and power transistor corresponding to the switching frequency to maintain a fixed output power of the power converter, and further to vary the current through the inductor and power transistor to maintain the fixed output power of the power converter over a range of switching frequencies. A first number of pulses of the drive signal to the power transistor during a first time period sets the fixed output power of the power converter. No pulses of the drive signal are provided during a second time period after the first time period.
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公开(公告)号：US10050535B2
公开(公告)日：2018-08-14
申请号：US15156033
申请日：2016-05-16
发明人： Ajay Karthik Hari , Dhruv Chopra
摘要： A power conversion circuit is provided. An input of the power conversion circuit is coupled to a first voltage potential. A switching frequency of the power conversion circuit is set based on a magnitude of the first voltage potential.
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