Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Publication of BE440569ApublicationCriticalpatent/BE440569A/xx
H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
H02M—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
H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
H02M7/42—Conversion of DC power input into AC power output without possibility of reversal
H02M7/54—Conversion of DC power input into AC power output without possibility of reversal by dynamic converters
H02M7/58—Conversion of DC power input into AC power output without possibility of reversal by dynamic converters using mechanical contact-making and -breaking parts to interrupt a single potential
H02M7/62—Conversion of DC power input into AC power output without possibility of reversal by dynamic converters using mechanical contact-making and -breaking parts to interrupt a single potential with electromagnetically-operated vibrating contacts, e.g. chopper
H—ELECTRICITY
H04—ELECTRIC COMMUNICATION TECHNIQUE
H04M—TELEPHONIC COMMUNICATION
H04M19/00—Current supply arrangements for telephone systems
H04M19/02—Current supply arrangements for telephone systems providing ringing current or supervisory tones, e.g. dialling tone or busy tone