EP 1046207 A1 20001025 - 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
Application
Priority
- DE 9902814 W 19990903
- DE 19840300 A 19980904
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
IPC 8 full level
H02H 11/00 (2006.01)
CPC (source: EP US)
H02H 11/003 (2013.01 - EP US)
Citation (search report)
See references of WO 0014847A1
Designated contracting state (EPC)
DE ES FR GB IT
DOCDB simple family (publication)
DE 19840300 A1 20000316; EP 1046207 A1 20001025; JP 2002525018 A 20020806; US 6429550 B1 20020806; WO 0014847 A1 20000316
DOCDB simple family (application)
DE 19840300 A 19980904; DE 9902814 W 19990903; EP 99968742 A 19990903; JP 2000569484 A 19990903; US 53070900 A 20000727