Multilevel pulse width modulation method, and modulator using this method

Abstract

Abstract The modulated wave whose level varies between a lower level (V1) and a higher level (V3) is characterised in that each transition of the wave (24) between the discrete continuous lower level (V1) and the discrete continuous higher level (V3) is produced by means of at least two successive similarly-directed switchings, the first switching occurring between a first extreme discrete continuous level (for example the lower level V1) and an intermediate discrete continuous level (for example the intermediate level V2), and the second switching occurring between an intermediate discrete continuous level (for example the intermediate level V2) and the second extreme discrete continuous level (for example the higher level V3). Under the modulation generated, a carrier wave (23) is compared with at least two modulating waves (for example the modulating waves 21, 22); the product wave (24) takes the lower discrete continuous level (V1) whenever the higher modulating wave (21) is below the carrier wave (23); the product wave (24) takes the intermediate discrete continuous level (V2) whenever the carrier wave (23) lies between the two modulating waves (21 and 22); and the product wave (24) takes the higher discrete continuous level (V3) whenever the lower modulating wave (22) is above the carrier wave (23). <IMAGE>

Inventors

• 👤 Guy Bingen
• 👤 Bruno Velaerts
• 👤 Jean Louis Van Eck

Bibliographic Details