New System Large Scale Integration for Elevator Drive Control

Mitsubishi has developed a new System-LSI chip incorporating a majority of the elements of our elevator control system. The previous control system included an original digital signal processing CPU core for the inverter/converter control. PWM controller, Car-speed limiting CPU core, and other car-control logic circuits. All of these components have been integrated on this one LSI-chip with approximately 250,000 logic gates. This integration has realized minimization of the control unit, high reliability, improvement of the control performance, and a reduction in cost.