Electronic power apparatus for controlling the movement of alternating current (AC) electric motors stopping such motors in a safe way

摘要

The invention refers to an electronic power apparatus (100) for controlling the movement of a three-phase alternating current electric motor (M). The apparatus comprises:
- an adjustment stage (101) to generate PWM digital signals (102);
- a power stage (103) to control the movement of the motor based on the PWM signals;
- a circuit block (106) arranged between the adjustment stage (101) and the power stage (103) to receive the PWM signals. The circuit block (106) is characterised in that it comprises an electronic buffer device (301) suitable for taking up an active/inactive state in response to a control signal (SE) applied to the circuit block (106). The buffer device (301) is configured to allow the digital signals (102) to transit from the adjustment stage (101) to the power stage (103) in the active state and to prevent such signals (102) from transiting in the inactive state.