CONTROL DEVICE OF PULSE WIDTH MODULATION INVERTER

PROBLEM TO BE SOLVED: To generate a synchronization pulse easily and to generate an output voltage where three phases are symmetrical. SOLUTION: In a three-level inverter, a synchronization means 1 for synchronizing the basic wave phase and the modulation wave signal of an inverter and a pulse gener...

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Hauptverfasser:	TERUNUMA MUTSUHIRO, TOYODA EIICHI
Format:	Patent
Sprache:	eng
Schlagworte:	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
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To generate a synchronization pulse easily and to generate an output voltage where three phases are symmetrical. SOLUTION: In a three-level inverter, a synchronization means 1 for synchronizing the basic wave phase and the modulation wave signal of an inverter and a pulse generation means 7 for generating a PWM pulse by delaying the 0-degree phase of the modulation wave signal by 1/4 cycle of a carrier signal are provided. The synchronization means 1 adds the increment of the basic phase of 1 sampling period, forces to set the basic phase to 0 degrees with a current sampling period when it is judged that the value of the basic phase reaches 360 degrees or larger in a next sampling period, while the pulse generation means 7 calculates pulse data that are proportional to the modulation wave signal that is a momentary output voltage command at the sampling period of 1/4 period of the carrier signal and outputs the operation result data to the next sampling period as a pulse.