公开(公告)号：US20220149734A1

公开(公告)日：2022-05-12

申请号：US17511813

申请日：2021-10-27

Applicant: uPI semiconductor corp.

Inventor： Chih-Lien CHANG ,  Wei-Hsiu HUNG ,  Chun-Ming LU ,  Min-Rui LAI

IPC: H02M3/158 ,  H02M1/00 ,  H02M1/12 ,  H03K7/08

Abstract: A control circuit of a power converter includes a sensing circuit, a ramp signal generation circuit and a PWM circuit. The sensing circuit, coupled to an output circuit, provides a current sensing signal. The ramp signal generation circuit includes a transient circuit and a signal generation circuit. The transient circuit receives the current sensing signal and generates a variable reference voltage. The signal generation circuit provides a ramp signal according to the variable reference voltage. The PWM circuit provides a PWM signal to the output circuit according to the ramp signal. When current sourcing occurs, it continues for a first default time. A transient state during current sourcing continues for a second default time less than first default time. The variable reference voltage is changed from a default value to an adjusted value during the second default time and restored to the default value after the second default time.

公开(公告)号：US20190296639A1

公开(公告)日：2019-09-26

申请号：US16296454

申请日：2019-03-08

Applicant: uPI semiconductor corp.

Inventor： Chih-Lien CHANG ,  Pei-Ling HONG ,  Min-Rui LAI

IPC: H02M3/156 ,  H03K5/24 ,  G05F3/10

Abstract: A current mirror calibration circuit, coupled to an error amplifier of a pulse-width modulation controller, includes a first voltage generation unit, a second voltage generation unit, a calibration unit and a current mirror circuit. During an initial period, the first voltage generation unit and second voltage generation unit provide a first default voltage and a second default voltage respectively. The current mirror circuit includes a first current unit and a second current unit. The first current unit receives an original current. The second current unit generates a mirror current having a proportional relationship with original current. The first current unit has a first node coupled to the first voltage generation unit and a second node coupled to a third default voltage. The second current unit has a third node coupled to the second voltage generation unit and calibration unit and a fourth node coupled to calibration unit and an output terminal of error amplifier.