INVERTER

• Main Authors: TANIMOTO TOMOAKI, KAI TORU
• Format: Patent
• Language: English
• Published: 18.11.1997
• 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; BASIC ELECTRIC ELEMENTS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; CONTROL OR REGULATION THEREOF; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; GENERATION; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS; PRINTED CIRCUITS; SEMICONDUCTOR DEVICES

PROBLEM TO BE SOLVED: To suppress leakage current for radio noise reduction by fitting a mounting part constituted of high insulation and high heat transmission material which fixes a semiconductor power switching element and whose dielectric constant is small, and a cooling fin formed integrally with the mounting part. SOLUTION: In this inverter for motor driving consisting of a rectifying circuit, a smoothing capacitor and an inverter part, a change in voltage occurs between a power switching element 3 and a mounting block 2 with high-speed operation of the power switching element 3 in the inverter part, and leakage current due to a stray capacitance occurs. In a box 1, the mounting block 2 which is formed with cooling fins as one body is formed by using high insulation and high heat transmission material whose dielectric constant is small. On the mounting clock 2, the power switching element 3 is fitted. It is thus possible to suppress leakage current by decreasing a stray capacitance, reduce radio noise from a ground line 26, and prevent some obstruction from being given to an adjacent measuring instrument, a radio receiver or other part.