Eingebauter Test für eine Überspannungsschutzschaltung

Details

Veröffentlichungs-Nr.

EP2479860

Aktenzeichen

EP11195635

Anmeldetag

23. Dezember 2011

Veröffentlichung

28. Juni 2017

Erteilung

28. Juni 2017

Rechtsraum

EP

IPC

H02H9/04H02H9/00H02H1/04

Abstract

An overvoltage protection circuit (12) connected to protect electrical components (R1,V1) from overvoltage conditions includes a blocking diode (D1) connected in series with a transient voltage suppression (TVS) device (14) via a first node (22) and includes a reference voltage (V REF ) for biasing the first node (22) at a voltage sufficient to reverse bias the blocking diode (D1) during normal operations. A built-in test circuit (16) associated with the overvoltage protection circuit (12) includes a resistor (R3) connected to the first node (27) and a switch (Q1) connected in series with the resistor (R3) that is selectively turned On and Off. The built-in test circuit (16) monitors voltage (V_signal) on a control line (11) associated with the electrical components (R1,V1) and voltage (V_AD) at the first node (22) while the switch is Off and while the switch is On, and detects fault conditions based on the monitored voltages (V_signal, V_AD).

Anmelder

Firma

Hamilton Sundstrand Corporation

Land

🇺🇸 USA

Fachgebiete