| abstract |
The invention relates to a respiratory assistance device (100) comprising a micro-blower (2) with an electric motor (3), a motor control system (5) and an electric power supply (4) supplying the electric motor (3 ) and the control system (5) via a power bus (20). The control system (5) comprises a transistor bridge circuit (80), arranged between the power supply (4) and the electric motor (3), comprising 3 transistor bridges (90, 91, 92) arranged in parallel , each bridge of transistors (90, 91, 92) connecting the bus (20) to the motor (3) and comprising a pair of transistors (T1-T6). A motor driver circuit (100) controls at least the accelerations and decelerations of the motor (3), and is electrically connected to the motor (3) and the transistors (T1-T6). Voltage regulation diodes (D1-D6) are arranged in parallel with the transistors (T1-T6) to limit overvoltages of the motor (3), during deceleration or braking of the motor (3). |