公开(公告)号：US10187955B2

公开(公告)日：2019-01-22

申请号：US15634809

申请日：2017-06-27

Applicant: Infineon Technologies AG

Inventor： Marco Pamato ,  Maurizio Galvano ,  Roberto Guerra ,  Aurelio Pellegrini ,  Damiano Sartori ,  Enrico Tonazzo

IPC: H01J1/60 ,  H01J7/42 ,  H05B37/04 ,  H05B33/08

Abstract: The disclosure is directed to a circuit that may detect a single short in a chain of loads, such as light emitting diodes (LEDs). The circuit may drive either multiple LED chains or a single LED chain to determine whether one, or more, of the LEDs in the LED chain is no longer working because of a short. The circuit determines whether the LED chain voltage satisfies a threshold based on a single LED voltage drop. Therefore, the same circuit may be used for applications regardless of the number of LEDs in an LED chain. Additionally, the circuit, according to the techniques of this disclosure may use may use no output pins, other than those used to deliver current to LED chains, regardless of the number of LED chains that the circuit drives.

公开(公告)号：US20180359824A1

公开(公告)日：2018-12-13

申请号：US15634809

申请日：2017-06-27

Applicant: Infineon Technologies AG

Inventor： Marco Pamato ,  Maurizio Galvano ,  Roberto Guerra ,  Aurelio Pellegrini ,  Damiano Sartori ,  Enrico Tonazzo

IPC: H05B33/08

CPC classification number: H05B33/089 ,  H05B33/083

Abstract: The disclosure is directed to a circuit that may detect a single short in a chain of loads, such as light emitting diodes (LEDs). The circuit may drive either multiple LED chains or a single LED chain to determine whether one, or more, of the LEDs in the LED chain is no longer working because of a short. The circuit determines whether the LED chain voltage satisfies a threshold based on a single LED voltage drop. Therefore, the same circuit may be used for applications regardless of the number of LEDs in an LED chain. Additionally, the circuit, according to the techniques of this disclosure may use may use no output pins, other than those used to deliver current to LED chains, regardless of the number of LED chains that the circuit drives.