| 摘要 |
<p>An electronic voltage regulator for electric motor drives uses digital switching output stage to minimise power boss. The constant voltage source delivers an output dependent upon the reference voltage setting. A comparator stage compares the reference with the actual voltage supplied to the motor and the difference signal controls the power stage. The comparator output is digited, with zero output level if the difference is positive and a one output level of the difference is negative. The power stage output is therefore in the form of a square wave. The regulation is achieved by generating an average of the signal that is varied by frequency and mark/space ratio changes. To protect the output stage against overload a cut-out stage (14) is provided.</p> |
