| 摘要 |
A method (1010) for determining a phase current (101) direction and a zero-crossing moment (T1) of the phase current (101) in a sinusoidally controlled brushless direct current motor (451). The brushless direct current motor (451) comprises a coil (452) per phase and the phase of the brushless direct current motor is driven by a half bridge driver (453). The half bridge driver comprises a high side field effect transistor (454) and a low side field effect transistor (455). The method comprising the following steps:
- measuring (1011) the drain source voltage over the high side field effect transistor (454) and low side field effect transistor (455),
- determining (1012) the zero crossing moment (T1) of the phase current by determining the current direction based on the measured drain source voltages and by determining the moment the current changes direction. |
