Why Digital Control Techniques?
Controller
Analog
or
Digital ??
PWM
Sensor(s)
Bandwidth limitations (sampling loop)
PWM frequency and resolution limits
Numerical problems (quantization, rounding,…)
AD / DA boundary (resolution, speed, cost)
CPU performance limitations
Bias supplies, interface requirements
Component drift and aging / unstable
Component tolerances
Hardwired / not flexible
Limited to classical control theory only
Large parts count for complex systems
Insensitive to environment (temp, drift,…)
High reliability
S/w programmable / flexible solution
Precise / predictable behavior
Advanced control possible (non-linear, multi-variable)
Can perform multiple loops and “other” functions
High bandwidth
High resolution
Easy to understand / use
Historically lower cost
+
Digital ControllerAnalog Controller
Power Elec.
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