INVERTER CIRCUIT

• Main Author: FURUKAWA KIMIHIKO
• Format: Patent
• Language: English
• Published: 26.02.1999
• Edition: 6
• 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 THEREOF; CONTROLLING; 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; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGYGENERATION, TRANSMISSION OR DISTRIBUTION; REGULATING; SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE; TESTING

PROBLEM TO BE SOLVED: To precisely detect a direct current contained in an output current of an inverter main circuit with a simple constitution so as to control the direct current. SOLUTION: This circuit is constituted of an inverter main circuit for converting D.C. power to A.C. power to be output to a D.C. output line 7, and an inverter control circuit for controlling operation of the inverter main circuit. In an inverter circuit having a control function to control to zero a direct current flowing in the D.C. output line 7, the inverter control circuit is provided with a current control circuit 13 containing a current sensor 8 fitted to the line 7, and a highly precise detection circuit 14 containing a shunt resistance 9 interposed in the line 7. The detection circuit 14 detects a direct current based on voltages of both ends in the shunt resistance 9 and converts a detected value into one or plural binary digits of digital values to be fed to the current control circuit 13, and the control circuit 13 receives supply of the digital values to correct a zero point of the current sensor 8.