公开(公告)号：US20200059157A1

公开(公告)日：2020-02-20

申请号：US16507370

申请日：2019-07-10

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： BoQiang XIAO

IPC: H02M3/07 ,  H02M7/219 ,  H02M1/42

Abstract: A circuit includes a rectifier, a charge pump, and a clamp control circuit. The rectifier has an input configured to be coupled to an alternating current (AC) power source. The rectifier rectifies an AC signal from the AC power source to produce a rectified voltage on a first voltage node. The rectifier includes a first transistor coupled to a ground node and to the input. The first switch has a first control input. The charge pump is coupled to the first voltage node. The charge pump is configured to generate a second voltage on a second voltage node. The voltage regulator is coupled to the second voltage node. The clamp control circuit is coupled to the first and second voltage nodes and has an output node coupled to the first control input.

公开(公告)号：US20200059165A1

公开(公告)日：2020-02-20

申请号：US16257915

申请日：2019-01-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： BoQiang XIAO ,  Andres Arturo BLANCO ,  Yogesh Kumar RAMADASS

IPC: H02M7/487 ,  H02M7/217 ,  H02M3/07

Abstract: A system includes a clamp circuit configured to regulate a converter input supply voltage based on control signals. The system also includes a converter configured to the adjust the converter input supply voltage to a converter output supply voltage. The system also includes a controller configured to adjust the control signals for the clamp circuit using a first mode based on the converter output supply voltage and a second mode based on the converter input supply voltage.