CHOPPER FOR ELECTRIC CAR

• Format: Patent
• Language: English
• Published: 22.09.1979
• 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 TOTRANSPORTATION; CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORSOR DYNAMO-ELECTRIC CONVERTERS; CONTROL OR REGULATION THEREOF; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC EQUIPMENT OR PROPULSION OF ELECTRICALLY-PROPELLEDVEHICLES; ELECTRICITY; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES, IN GENERAL; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERATION; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; PERFORMING OPERATIONS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TRANSPORTING; VEHICLES IN GENERAL

PURPOSE:To make current balance precise without a current balancing reactor by controlling an ignition signal given to the main thyristor in a circuit in which two or more thyristors are connected with each other in parallel. CONSTITUTION:The DC current transformers DCCT1 and DCCT2 for current- detection are provided to the smoothing reactors MSL1 and MSL2 respectively. When a difference is produced in the detecting values of these current transformers, for example, IMSL2>IMSL2, an ''on'' pulse to be given to the main thyristor MCRF1 is shifted to the right side of Figure and ''on'' pulse to be given to the main thyristor MCRF2 is shifted to the left side in order to narrow the conducting range of the main thyristor MCRF1 and to widen the conducting range of the main thyristor MCRF2 for balancing two current values of both thyristors.