CLOSED LOOP DIODE EMULATOR FOR DC-DC CONVERTER

• Main Authors: WIKTOR, STEFAN WLODZIMIERZ, LI, XUENING
• Format: Patent
• Language: English; French
• Published: 04.03.2004
• 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 diode emulator for a DC-DC buck converter employs a variable current ramp-based circuit that monitors the state of the phase voltage at the common node between two power switching devices. Incrementally with each pulse width modulation cycle, the diode emulator adjusts the time of turn-off of the lower power switching device, until the monitored phase voltage indicates that the emulator is effectively tracking the negative going, zero-crossing of the ripple current through an output inductor. L'invention concerne un émulateur à diode pour un convertisseur abaisseur de tension continu-continu utilisant un circuit sur la base d'une rampe de courant variable. Ledit circuit surveille l'état de la tension de phase sur le noeud commun entre deux dispositifs de commutation de puissance. De manière incrémentielle avec chaque cycle de modulation de largeur d'impulsions, l'émulateur à diode ajuste le temps de blocage du dispositif inférieur de commutation de puissance, jusqu'à ce que la tension de phase surveillée indique que l'émulateur suit effectivement le sens négatif, le passage par zéro du courant ondulatoire à travers un inducteur de sortie.