MODADEC: a VLSI circuit adapted to any kind of 2 levels PWM modulation

A new VLSI circuit which was developed to drive inverter-fed AC motors is described. It has been conceived as a peripheral of a microprocessor and offers a wide choice of PWM modes and strategies. The steady-state PWM waveforms are generated with high precision on the instant of commutation. The IC has high-frequency performances and can handle different optimizations of transients when changing PWM modes. The circuit is suitable for variable-speed applications, from servo-applications where a high commutation frequency and fast dynamic are required to high-power traction applications, where it is imperative to have smooth transitions and perfect torque control.<
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