| 摘要 |
Methods and apparatus are provided for frequency scaling the PWM signal output of a controller/driver for an electrical device such as a BLDC motor. The apparatus comprises a number of multiple half-bridge assemblies, with each multiple half-bridge assembly connected to a respective phase winding of the motor. Each individual half-bridge assembly is operated within the frequency limit of its internal switching elements, but the composite output frequency of each multiple half-bridge assembly can be the product of the switching element frequency and the number of individual half-bridge assemblies in the multiple half-bridge assembly. High-speed torque loop control is implemented by synchronizing multiple DSP's with overlapping interrupts, so that the output pulse width of the PWM signal can be adjusted on a pulse-to-pulse basis. Moreover, the frequency scaling and pulse-to-pulse control processes can be achieved with standard off-the-shelf devices.
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