| 摘要 |
PURPOSE:To enable a simple, inexpensive and wide operation range of an inverter by employing an inverter in which a logic unit is composed of a software contained in a microprocessor. CONSTITUTION:A main circuit has a microcomputer logic unit and a power generator. No.1 microcomputer forms a sinusoidal function by a reference sinusoidal function stored in a ROM13. No.2 microcomputer generates a timing signal. It is not necessary to store in advance bit patterns for all possible combinations of V/F of various sinusoidal waves by alternately exchanging the functions of two setting RAMs 15A, 15B, two 3-phase RAMs 16A to 16F, two preset counters 21A, 21B by providing these pairs, and any desired voltage levels for given frequency can be performed without memory means. |
