(19)
(11)EP 3 471 227 A3

(12)EUROPEAN PATENT APPLICATION

(88)Date of publication A3:
26.06.2019 Bulletin 2019/26

(43)Date of publication A2:
17.04.2019 Bulletin 2019/16

(21)Application number: 18199330.4

(22)Date of filing:  09.10.2018
(51)International Patent Classification (IPC): 
H02H 1/06(2006.01)
H02H 9/02(2006.01)
H02H 3/08(2006.01)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 10.10.2017 US 201715729560

(71)Applicant: IXYS, LLC
Milpitas CA 95035 (US)

(72)Inventor:
  • Neyman, Leonid A.
    Sunnyvale, 94087 (US)

(74)Representative: Duxbury, Stephen et al
Arnold & Siedsma Bavariaring 17
80336 München
80336 München (DE)

  


(54)SELF-POWERED ELECTRONIC FUSE


(57) A two-terminal electronic fuse device (1) involves two switches (5, 6), four diodes (7, 8, 9, 10), switch control circuitry (13), and a storage capacitor (11), connected in a particular topology. When AC current flows through the fuse, a charging current (19, 20) charges the storage capacitor. Energy stored in the storage capacitor is then used to power the switch control circuitry. If the voltage on the storage capacitor drops, then the switches are opened briefly and at the correct time. Opening the switches allows the charging current to flow. By opening the switches and charging the storage capacitor only at times of low current flow through the fuse, the disturbance of load current flowing through the fuse is minimized. If an overload current condition is detected, then the fuse has tripped and first and second switches are opened. If the capacitor does not need charging and there is no overload condition, then the switches remain closed.
Fig. 1







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Search report