Input protection circuit

H - Electricity – 02 – H

Patent

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Details

H02H 9/04 (2006.01) H02M 7/04 (2006.01)

Patent

CA 2722362

A voltage clamp protection circuit to protect against overvoltage conditions where there is insufficient current to blow a fuse. The voltage clamp protection circuit includes a voltage clamp and a thermal cutoff. The voltage clamp clamps any overvoltage to a clamping voltage. If an overvoltage condition persists for too long the voltage clamp dissipates a sufficient amount of heat to activate the thermal cutoff creating an open circuit that protects the rest of the circuit. The voltage clamp protection circuit may be used in combination with a variety of other protection circuits to provide increased protection.

Linvention concerne un circuit de protection de bloqueur de tension pour la protection contre des conditions de surtension où le courant est insuffisant pour faire sauter un fusible. Le circuit de protection de bloqueur de tension comprend un bloqueur de tension et un blocage thermique. Le bloqueur de tension bloque toute surtension à une tension de blocage. Si une condition de surtension persiste trop longtemps, le bloqueur de tension dissipe une quantité suffisante de chaleur pour activer le blocage thermique créant un circuit ouvert qui protège le reste du circuit. Le circuit de protection de bloqueur de tension peut être utilisé en combinaison avec une variété dautres circuits de protection pour fournir une protection accrue.

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