| 摘要 |
The invention relates to a system for controlling the speed of a motor ( 1 ) of an electric fan unit comprising a field-effect transistor ( 3 ) that controls the motor ( 1 ) using pulse-width modulation, the field-effect transistor ( 3 ) being connected to a circuit ( 5 ) comprising a voltage source ( 7 ) and a resistive element ( 9 ) in series, the circuit ( 5 ) is connected between the gate (G) of the field-effect transistor ( 3 ) and a second source (S 2 ) that is connected to a first source (S 1 ) of the field-effect transistor ( 3 ), via an inductor ( 11 ) in order to allow a reduction in the slope of the current as the field-effect transistor ( 3 ) switches.
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