SELF-POWERED OVER-VOLTAGE PROTECTION CIRCUIT

• Main Author: ISHAM, ROBERT, HAYNES
• Format: Patent
• Language: English; French
• Published: 24.06.2004
• Edition: 7
• Subjects: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS; CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS,e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USERAPPLICATIONS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRICITY; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

A self-powered overvoltage protection circuit for a regulated DC-DC converter looks for the onset of a very large input voltage prior to regulation. In response to such a voltage during this interval, it turns on a low side electronic power switching device, in accordance with the voltage at one of the phase node and the regulated voltage output terminal from which the protection circuit derives its power. This provides a bypass path for an overvoltage that would otherwise be coupled from the regulated voltage output terminal to one or more load devices. L'invention concerne un circuit de protection contre les surtensions à alimentation propre pour un convertisseur de courant continu régulé en courant continu, ledit circuit attendant l'occurrence d'une tension d'entrée très haute avant la régulation. En réponse à une telle tension pendant cet intervalle de temps, il met en marche un dispositif d'ouverture et de fermeture électronique de circuit d'extrémité inférieure en fonction de la tension se trouvant sur le noeud de phase ou sur la borne de sortie de tension régulée d'où le circuit de protection prend sa puissance. D'où la réalisation d'un chemin de shuntage pour une surtension qui, sinon, serait couplée de la borne de sortie de tension régulée à un ou plusieurs dispositifs de charge.