Global Patent Index - EP 1046207 A1

EP 1046207 A1 2000-10-25 - POLARITY REVERSAL PROTECTION CIRCUIT FOR A FINAL ELECTRONIC POWER STAGE

Title (en)

POLARITY REVERSAL PROTECTION CIRCUIT FOR A FINAL ELECTRONIC POWER STAGE

Title (de)

VERPOL-SCHUTZSCHALTUNG FÜR EINE ELEKTRONISCHE LEISTUNGSENDSTUFE

Title (fr)

CIRCUIT DE PROTECTION CONTRE LES INVERSIONS DE POLARITE POUR UN ETAGE TERMINAL DE PUISSANCE ELECTRONIQUE

Publication

EP 1046207 A1 (DE)

Application

EP 99968742 A

Priority

  • DE 9902814 W
  • DE 19840300 A

Abstract (en)

[origin: DE19840300A1] The invention relates to a polarity reversal protection circuit for a final electronic power stage that can be controlled via a control circuit, whereby the connection of a wrongly applied supply voltage to a control circuit and a final power stage can be interrupted by means of power FETs in at least one power supply connection when the polarity of said supply voltage is wrong. Effective polarity reversal protection is provided by means of a circuit that has been improved in terms of cost and surface requirements, whereby a single N channel power FET (T2) with a source drain section (S-D) is introduced into the positive (+) supply connection of the supply voltage (VS). The source connection (S) is joined to the positive (+) supply connection, whereby the gate connection (G) of the N channel power FET (T2) is connected to the collector (C) of a PNP transistor (T1) that is also connected to the output (A) of the control circuit (AST-IC) via a current-limiting resistor (R2). The emitter (E) of the PNP transistor (T1) is joined to the positive (+) supply connection via a conducting diode (D1) whenever a supply voltage (Vs) is wrongly applied and the base (B) of the PNP transistor (T1) is joined to the negative (ground) (-) supply connection of the supply voltage (Vs) via a base resistor (R1).

IPC 1-7 (main, further and additional classification)

H02H 11/00; H02H 3/18

IPC 8 full level (invention and additional information)

H02H 11/00 (2006.01)

CPC (invention and additional information)

H02H 11/003 (2013.01); Y10T 307/74 (2015.04); Y10T 307/826 (2015.04); Y10T 307/839 (2015.04)

Citation (search report)

See references of WO 0014847A1

Designated contracting state (EPC)

DE ES FR GB IT

EPO simple patent family

DE 19840300 A1 20000316; EP 1046207 A1 20001025; JP 2002525018 A 20020806; US 6429550 B1 20020806; WO 0014847 A1 20000316

INPADOC legal status


2009-05-13 [18D] DEEMED TO BE WITHDRAWN

- Ref Legal Event Code: 18D

- Effective date: 20081117

2008-06-04 [17Q] FIRST EXAMINATION REPORT

- Ref Legal Event Code: 17Q

- Effective date: 20080506

2004-05-19 [RBV] DESIGNATED CONTRACTING STATES (CORRECTION):

- Ref Legal Event Code: RBV

- Designated State(s): DE ES FR GB IT

2000-11-15 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000918

2000-10-25 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE