Overtemperature sensing and signaling circuit

Details Overtemperature sensing and signaling circuit Overtemperature sensing and signaling circuit

H - Electricity

02

H

H02H 5/04 (2006.01) G01K 3/00 (2006.01) H01H 71/12 (2006.01)

Patent

CA 2115357

An overtemperature sensing and signaling circuit for electronic trip units includes a voltage divider (16) and a trigger circuit (18). The voltage divider is formed of a first resistor (R1) and a positive coefficient resistor (PT1). The trigger circuit is formed of a first bipolar transistor of the PNP-type conductivity and a second bipolar transistor (Q2) of the NPN-type conductivity.

L'invention est un circuit de détection de température excessive pour unités de déclenchement électroniques qui comprend un diviseur de tension (16) et un circuit de déclenchement (18). Le diviseur de tension est constitué d'une première résistance (R1) et d'une résistance à coefficient de température positive (PT1). Le circuit de déclenchement est formé d'un premier transistor bipolaire (Q1) du type pnp et d'un second transistor bipolaire (Q2) du type npn.

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