公开(公告)号：US20210408928A1

公开(公告)日：2021-12-30

申请号：US17399004

申请日：2021-08-10

Applicant: Texas Instruments Incorporated

Inventor： Bharath Balaji Kannan ,  Bing Lu

IPC: H02M3/335 ,  H02M1/08

Abstract: 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.

公开(公告)号：US10734908B2

公开(公告)日：2020-08-04

申请号：US16427094

申请日：2019-05-30

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bharath Kannan ,  Bing Lu

IPC: H02M3/335 ,  H02M1/08 ,  H03K19/20 ,  H02M1/00

Abstract: A synchronous rectifier control circuit includes a drain voltage input, a gate voltage output, a gate voltage generation circuit, a burst detection circuit, an on-time monitor circuit, and a burst mode reset circuit. The gate voltage generation circuit includes a first input coupled to the drain voltage input, and an output coupled to the gate voltage output. The burst detection circuit includes a first input coupled to the drain voltage input, and an output coupled to a second input of the gate voltage generation circuit. The on-time monitor circuit includes an input coupled to the output of the gate voltage generation circuit. The burst mode reset circuit includes a first input coupled to the drain voltage input, a second input coupled to an output of the on-time monitor circuit, and an output coupled to a second input of the burst detection circuit.

公开(公告)号：US20200036293A1

公开(公告)日：2020-01-30

申请号：US16052444

申请日：2018-08-01

Applicant: Texas Instruments Incorporated

Inventor： Bharath Balaji Kannan ,  Bing Lu

IPC: H02M3/335 ,  H02M1/08

Abstract: 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.

公开(公告)号：US09991798B2

公开(公告)日：2018-06-05

申请号：US14179792

申请日：2014-02-13

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bing Lu

IPC: H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33507 ,  H02M2001/0032 ,  H02M2001/0054 ,  Y02B70/1491 ,  Y02B70/16

Abstract: 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.

公开(公告)号：US09595875B2

公开(公告)日：2017-03-14

申请号：US14335849

申请日：2014-07-18

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Bing Lu ,  Ulrich B. Goerke

IPC: H02M3/335 ,  H02M1/00

CPC classification number: H02M3/33523 ,  H02M3/335 ,  H02M3/33507 ,  H02M3/33546 ,  H02M3/33592 ,  H02M2001/0025

Abstract: 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.

Abstract translation: 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。