公开(公告)号：US10439510B2

公开(公告)日：2019-10-08

申请号：US15458734

申请日：2017-03-14

Applicant: NXP B.V.

Inventor： Peter Christiaans ,  Robert Glenn Crosby, II ,  Fu Chun Zhan

IPC: G01R15/16 ,  H02M7/219 ,  G01R19/00 ,  H02J7/00 ,  H02J7/02 ,  H02J7/04 ,  H02M1/00

Abstract: In an example embodiment, an apparatus includes a bridge rectifier circuit having branches between the AC and DC nodes formed by a set of transistors. A load current measurement circuit includes a current-controlled current source coupled to the bridge rectifier circuit. The current control current source is configured to generate a mirrored current that is a scaled version of a current through at least one of the set of transistors. A current integration circuit is configured to integrate the mirrored current by charging a capacitor with the scaled current in a first mode and discharging the capacitor in a second mode. A sample and hold circuit is configured to set an output node to a voltage equal to a voltage stored by the capacitor in response to the current integration circuit entering the second mode and prior to the discharge of the capacitor.

公开(公告)号：US10763661B2

公开(公告)日：2020-09-01

申请号：US15703999

申请日：2017-09-14

Applicant: NXP B.V.

Inventor： Mingliang Wan ,  Fu Chun Zhan ,  Yuanwei Yang

IPC: H02H3/18 ,  H02H3/08 ,  H02H11/00 ,  H02H3/00

Abstract: A reverse current protection circuit for a switch circuit includes a reverse current control circuit and an enable/disable circuit coupled to the reverse current control circuit. The reverse current control circuit is coupled to an input terminal and an output terminal of the switch circuit, and disconnects the output terminal of the switch circuit from the input terminal of the switch circuit when an output voltage of the switch circuit is higher than a first predetermined voltage. The enable/disable circuit disables the reverse current control circuit for a first predetermined time period when the output voltage of the switch circuit becomes lower than the first predetermined voltage after being higher than the first predetermined voltage, and enables the reverse current control circuit after the first predetermined time period.