公开(公告)号：US10602594B2

公开(公告)日：2020-03-24

申请号：US16331519

申请日：2017-09-05

Applicant: PROFOTO AB

Inventor： Johnny Svensson ,  Carl Johan Grubbström

IPC: H05B41/32 ,  G05F1/10

Abstract: The invention discloses a drive circuit and a method for controlling a drive circuit for a flash tube. The drive circuit comprises a capacitor and a first inductor switch group comprising a first inductor and at least one first switch connected in series with each other. The first inductor switch group is configured to be connected in series with the flash tube and the capacitor. The drive unit further comprises at least a second inductor switch group comprising a second inductor and at least one second switch connected in series with each other and configured to be connected in series with the flash tube and the capacitor, and in parallel with the first inductor switch group. The method further comprises the steps of receiving input parameters related to a desired flash characteristics, and controlling the first and second switches separately based on the received input parameters to obtain the desired flash characteristics.

公开(公告)号：US20190208610A1

公开(公告)日：2019-07-04

申请号：US16331519

申请日：2017-09-05

Applicant: PROFOTO AB

Inventor： Johnny Svensson ,  Carl Johan Grubbström

IPC: H05B41/32

CPC classification number: H05B41/32 ,  G05F1/10

Abstract: The invention discloses a drive circuit and a method for controlling a drive circuit for a flash tube. The drive circuit comprises a capacitor and a first inductor switch group comprising a first inductor and at least one first switch connected in series with each other. The first inductor switch group is configured to be connected in series with the flash tube and the capacitor. The drive unit further comprises at least a second inductor switch group comprising a second inductor and at least one second switch connected in series with each other and configured to be connected in series with the flash tube and the capacitor, and in parallel with the first inductor switch group. The method further comprises the steps of receiving input parameters related to a desired flash characteristics, and controlling the first and second switches separately based on the received input parameters to obtain the desired flash characteristics.

公开(公告)号：US10674575B2

公开(公告)日：2020-06-02

申请号：US16331517

申请日：2017-09-05

Applicant: PROFOTO AB

Inventor： Johnny Svensson ,  Carl Johan Gurbbström

IPC: H05B41/38 ,  H05B41/30 ,  H05B41/32 ,  G03B15/05 ,  G01R33/00 ,  G01R19/175

Abstract: The invention discloses a method for determining a starting time for a flash emitted from a flash tube of a flash apparatus. The flash apparatus comprises a triggering circuit, and a drive circuit. The method comprises the steps of measuring an electric current through and/or a voltage across an electrical component of the drive circuit, and determining the starting time for the flash based on the measured electric current and/or voltage.

公开(公告)号：US20190208611A1

公开(公告)日：2019-07-04

申请号：US16331517

申请日：2017-09-05

Applicant: PROFOTO AB

Inventor： Johnny Svensson ,  Carl Johan Grubbström

IPC: H05B41/38 ,  G01R19/175 ,  H05B41/30

Abstract: The invention discloses a method for determining a starting time for a flash emitted from a flash tube of a flash apparatus. The flash apparatus comprises a triggering circuit, and a drive circuit. The method comprises the steps of measuring an electric current through and/or a voltage across an electrical component of the drive circuit, and determining the starting time for the flash based on the measured electric current and/or voltage.