CONTROL SYSTEM FOR CHOPPER

• Main Authors: HASHIMA KESAO, SUGIMOTO TOMOAKI
• Format: Patent
• Language: English
• Published: 28.02.1983
• 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; 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; ELECTRICITY; GENERATION

PURPOSE:To set the minimum and maximum current flow rates of a chopper by forming a comparator which compares the voltage of a triangular wave generator with the current flow rate instruction voltage to discriminate the amplitude of an input voltage with the prescribed hysteresis width. CONSTITUTION:The output of a triangular wave generator 32 which generates a fundamental wave for setting the frequency of a chopper 30 and controlling the current flow rate is compared by a comparator 34 with the controlled input voltage, thereby generating a signal for instructing the current flow rate of the chopper 30. When the voltage V0 of the generator 32 approaches from the direction of small voltage lower than the controlled input voltage Vc, the current flow rate instruction signal is set from ''1'' to ''0'', and when the V0 approaches to Vc from the direction that is larger than Vc at the V0, the signal is set from ''0'' to ''1''. Accordingly, the width of the conducting time of the chopper is generated at the minimum and maximum values of the triangular voltage, thereby extremely reducing the variation in the current flow rate by a simple circuit.