公开(公告)号：US10897193B2

公开(公告)日：2021-01-19

申请号：US16216452

申请日：2018-12-11

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： William James Long

IPC: H02M1/42 ,  H02M1/14 ,  H02M1/08 ,  H02M3/335

Abstract: A system includes a switching power supply that includes switch devices configured to provide a regulated output voltage based on an input voltage. A controller is configured to control the switch devices based on a power demand signal. A direct conduction avoidance circuit is configured to provide a direct conduction avoidance signal based on the regulated output voltage exceeding a direct conduction threshold voltage. The direct conduction avoidance signal is combined with a compensation signal to provide the power demand signal to the controller. An override circuit is configured to disable the direct conduction avoidance circuit based on the input voltage of the switching power supply being below an override threshold voltage.

公开(公告)号：US10958176B2

公开(公告)日：2021-03-23

申请号：US14494982

申请日：2014-09-24

Applicant: Texas Instruments Incorporated

Inventor： Andrew Bernard Keogh ,  Joseph Michael Leisten ,  William James Long

IPC: H02M3/335 ,  H02M1/00

Abstract: Example embodiments of the systems and methods of CCM primary-side regulation disclosed herein subtract an estimate of the secondary IR drop from each output voltage sample. This allows a fixed sample instant to be set (with regard to the beginning of the off or flyback interval), and removes the need to hunt for or adjust to an optimum sample instant, or one with minimum IR drop error. The estimate of the IR drop may be adjusted on a cycle-by-cycle basis, based on the commanded primary peak current, knowing that the peak secondary current will be directly proportional by the turns ratio of the transformer. For improved accuracy, an adjustment may be made for the decay of secondary current during the delay to the sample instant, if the inductance value is known.

公开(公告)号：US10673322B1

公开(公告)日：2020-06-02

申请号：US16544425

申请日：2019-08-19

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Salvatore Giombanco ,  Ananthakrishnan Viswanathan ,  William James Long

IPC: H02M1/42 ,  H02M1/00 ,  H02M3/335

Abstract: A power factor correction controller zero current detection circuit includes a differentiator circuit, a comparator, a first qualification timer circuit, an idle ringing detector circuit, a second qualification timer circuit, and a flip-flop. The comparator is coupled to the differentiator circuit. The first qualification timer circuit includes an input coupled to an output of the comparator. The idle ringing detector circuit includes a first input coupled to the output of the comparator, and a second input coupled to an output of the first qualification timer circuit. The second qualification timer circuit includes a first input coupled to the output of the first qualification timer circuit, and a second input coupled an output of the idle ringing detector circuit. The flip-flop includes a first input coupled to the output of the comparator, and a second input coupled to an output of the second qualification timer circuit.

公开(公告)号：US20150103566A1

公开(公告)日：2015-04-16

申请号：US14494982

申请日：2014-09-24

Applicant: Texas Instruments Incorporated

Inventor： Andrew Bernard Keogh ,  Joseph Michael Leisten ,  William James Long

IPC: H02M3/335

CPC classification number: H02M3/33507

Abstract: Example embodiments of the systems and methods of CCM primary-side regulation disclosed herein subtract an estimate of the secondary IR drop from each output voltage sample. This allows a fixed sample instant to be set (with regard to the beginning of the off or flyback interval), and removes the need to hunt for or adjust to an optimum sample instant, or one with minimum IR drop error. The estimate of the IR drop may be adjusted on a cycle-by-cycle basis, based on the commanded primary peak current, knowing that the peak secondary current will be directly proportional by the turns ratio of the transformer. For improved accuracy, an adjustment may be made for the decay of secondary current during the delay to the sample instant, if the inductance value is known.

Abstract translation: 本文公开的CCM初级侧调节的系统和方法的示例实施例从每个输出电压样本中减去二次IR滴的估计。 这允许设置固定的采样时刻（关于关闭或反激间隔的开始），并且消除了寻找或调整到最佳采样时刻的需要或者具有最小IR降低误差的需要。 可以根据指令的初级峰值电流逐周期地调整IR降低的估计，知道峰值二次电流将与变压器的匝数比成正比。 为了提高精度，如果电感值已知，则可以对延迟到采样时刻的二次电流的衰减进行调整。