signallimiter-ratelimit

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signallimiter-ratelimit

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Library

Signal\Block Diagram Non-Linear

Use

Domains: Discrete, Continuous. Size: 1-D. Allowed in: Block Diagrams.

Description

This model limits the input signal to a minimum and maximum rate.

 

doutput/dt = dinput/dt; (minimum < dinput/dt < maximum)

doutput/dt = minimum; (dinput/dt < minimum)

output = maximum (dinput/dt > maximum)

 

En example is shown below where a sinusoidal input signal is limited to a maximum rate of 0.4 and a minimum rate of -0.8.

SignalLimiter-RateLimit

The rate limiter uses a first order filter to approximate the derivative of the input. Below the cut-off frequency fl the approximation is accurate and the model behaves as a rate limiter. Above the cut-off frequency fl the model output weakens to zero. For high values of the cut-off frequency fl, the model will slow down simulation because it forces the integration method to take very small time-steps. A good trade-off for most models is a starting value of 100 [Hz].

Interface

Inputs

Description

input

 

 

Outputs

 

output

 

 

Parameters

 

minimum

maximum

fl

Minimum rate of the output.

Maximum rate of the output.

Cut-off frequency [Hz]