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公开(公告)号：US20190181762A1
公开(公告)日：2019-06-13
申请号：US16276075
申请日：2019-02-14
发明人： Pei-Hsin Liu , Bing Lu
摘要： These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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公开(公告)号：US10270354B1
公开(公告)日：2019-04-23
申请号：US16044952
申请日：2018-07-25
发明人： Bing Lu , Bharath Balaji Kannan
摘要： A synchronous rectifier controller integrated circuit. The synchronous rectifier controller integrated circuit comprises a continuous current mode (CCM) detection circuit configured to detect CCM operation based on sensing a voltage at a pre-defined point in a rectification cycle; a multiplexer having a first reference voltage signal input, a second reference voltage signal input, an output, and a selector input coupled to the CCM detection circuit; and a gate voltage driver circuit coupled to the output of the multiplexer.
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公开(公告)号：US10243469B1
公开(公告)日：2019-03-26
申请号：US15786378
申请日：2017-10-17
发明人： Pei-Hsin Liu , Bing Lu
摘要： These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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公开(公告)号：US11128224B2
公开(公告)日：2021-09-21
申请号：US16052444
申请日：2018-08-01
发明人： Bharath Balaji Kannan , Bing Lu
摘要： Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.
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公开(公告)号：US11005381B2
公开(公告)日：2021-05-11
申请号：US16448024
申请日：2019-06-21
发明人： Bing Lu , Bharath Kannan
摘要： A synchronous rectifier control circuit includes a drain voltage input, a first gate voltage output, a second gate voltage output, a gate voltage generation circuit, and a trigger control circuit. The gate voltage generation circuit includes a first input coupled to the drain voltage input, and an output coupled to the first gate voltage output. The trigger control circuit includes a first input coupled to the first gate voltage output, a second input coupled to the second gate voltage output, and an output coupled to a second input of the gate voltage generation circuit.
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公开(公告)号：US20150029762A1
公开(公告)日：2015-01-29
申请号：US14335849
申请日：2014-07-18
发明人： Bing Lu , Ulrich B. Goerke
IPC分类号： H02M3/335
CPC分类号： H02M3/33523 , H02M3/335 , H02M3/33507 , H02M3/33546 , H02M3/33592 , H02M2001/0025
摘要： On the secondary side of a flyback switching power converter, a compensation diode and a voltage divider with an averaging circuit generate an output current-compensated reference voltage that is proportional to converter output current. The current-compensated reference voltage is added to a regulation feedback controller reference voltage, which in turn adjusts the negative feedback signal to the PWM regulation controller on the primary side in proportion to the converter output current draw. The net effect is to increase the converter output voltage set-point in proportion to the converter output current draw as compensation for a voltage drop in a cable connecting the converter to a powered device. More precisely-regulated voltage levels may be delivered to an input of the powered device as a result.
摘要翻译： 在反激式开关电源转换器的次级侧，补偿二极管和具有平均电路的分压器产生与转换器输出电流成比例的输出电流补偿参考电压。 电流补偿参考电压被加到调节反馈控制器参考电压，该参考电压反过来将负反馈信号调整到初级侧的PWM调节控制器，与转换器输出电流消耗成比例。 最终的效果是将转换器输出电压设定值与转换器输出电流的比例成正比，作为将转换器连接到有源设备的电缆中的电压降的补偿。 因此，更精确调节的电压电平可能被传送到被供电装置的输入端。
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公开(公告)号：US10554133B2
公开(公告)日：2020-02-04
申请号：US16276075
申请日：2019-02-14
发明人： Pei-Hsin Liu , Bing Lu
摘要： These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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公开(公告)号：US20190115836A1
公开(公告)日：2019-04-18
申请号：US15786378
申请日：2017-10-17
发明人： Pei-Hsin Liu , Bing Lu
摘要： These teachings apply with respect to a direct current (DC)-output converter and provide for adjusting a number of switching pulses per burst cycle as a function, at least in part, of converter output loading. This adjustment can be made by controlling burst frequency with respect to at least one predetermined threshold frequency. The predetermined threshold frequency can comprise a non-audible frequency such that the number of switching pulses is adjusted to prevent the burst frequency from itself constituting an audible signal. The adjustment of the number of switching pulses per burst cycle may only occur when the output loading is less than a predetermined level of loading. These teachings may also provide for clamping the pulse frequency for the pulses in each burst package to a particular value when dynamically controlling the number of pulses in each burst package. The aforementioned particular value may constitute, for example, a highest available switching frequency.
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公开(公告)号：US20150229199A1
公开(公告)日：2015-08-13
申请号：US14179792
申请日：2014-02-13
发明人： Bing Lu
CPC分类号： H02M3/33507 , H02M2001/0032 , H02M2001/0054 , Y02B70/1491 , Y02B70/16
摘要： An electronic device includes a power stage, a switch and a controller. Power is transferred from an input through the power stage to an output. The switch turns on and off a current provided to the power stage for transferring the power. The controller turns on and off the switch. During a low-load mode, the controller causes the switch to operate with a constant on-time control.
摘要翻译： 电子设备包括功率级，开关和控制器。 电源从输入通过功率级传输到输出。 开关打开和关闭提供给功率级的电流，用于传输电力。 控制器打开和关闭开关。 在低负载模式下，控制器使开关以恒定的导通时间控制运行。
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公开(公告)号：US11646669B2
公开(公告)日：2023-05-09
申请号：US17399004
申请日：2021-08-10
发明人： Bharath Balaji Kannan , Bing Lu
CPC分类号： H02M3/33592 , H02M1/08 , H02M1/0009 , H02M1/0032
摘要： Methods, apparatus, systems, and articles of manufacture are disclosed for adaptive synchronous rectifier control. An example apparatus includes an adaptive off-time control circuit to determine a first voltage and a second voltage when a drain voltage of a switch satisfies a voltage threshold, the first voltage based on a first off-time of the switch, the second voltage based on the first off-time and a first scaling factor, determine a third voltage based on a second scaling factor and a second off-time of the switch, the second off-time after the first off-time, and determine a third off-time of the switch based on at least one of the second voltage or the third voltage. The example apparatus further includes a driver to turn off the switch for at least the third off-time after the second off-time.
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