H | ELECTRICITY |
02 | GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER |
M | APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF |
7 | Conversion of ac power input into dc power output; Conversion of dc power input into ac power output |
42 | Conversion of dc power input into ac power output without possibility of reversal |
44 | by static converters |
48 | using discharge tubes with control electrode or semiconductor devices with control electrode |
53 | using devices of a triode or transistor type requiring continuous application of a control signal |
537 | using semiconductor devices only, e.g. single switched pulse inverters |
539 | with automatic control of output wave form or frequency |
5395 | by pulse-width modulation |