Patent ID: 11906890
Assignee: HISENSE LASER DISPLAY CO., LTD
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 4:
5. The laser projection apparatus according to claim 1, wherein the diffusion wheel driving circuit includes a driving sub-circuit and a timing control sub-circuit;
the driving sub-circuit is configured to provide a drive current to the three-phase motor according to the second startup pulse width modulation signal provided by the main control circuit and a timing control signal provided by the timing control sub-circuit or according to the operating pulse width modulation signal provided by the main control circuit and the timing control signal; and
the timing control sub-circuit is configured to obtain three-phase output voltages of the three-phase motor, generate the timing control signal and a frequency signal for indicating a rotation speed of the three-phase motor according to the three-phase output voltages, transmit the timing control signal to the drive sub-circuit, and transmit the frequency signal to the main control circuit.