Monostable
Implement monostable flip-flop (one-shot multivibrator)
Library
Simscape / Electrical / Specialized Power Systems / Control & Measurements / Logic
Description
The Monostable block outputs a true pulse when a change in the logical input is detected.
The Monostable block can be programmed to detect a rising edge (when the input goes from false to true), a falling edge (when the input goes from true to false), or either edge (any change in input is detected). The Monostable block ignores any edge occurring when the pulse is true.
Parameters
- Edge detection
Select the detection criteria triggering the output pulse. Choices are
Rising(default),Falling, orEither.- Pulse duration (s)
Specify the duration of the output true state. When the Sample time parameter is greater than
0, the Pulse duration value must be a multiple of the sample time. Default is0.015.- Initial condition of previous input
Specify the initial value of the previous input (
0or1). The Monostable block can detect an edge at t =0if the input is different from the specified value. Default is0.- Sample time
Specify the sample time of the block, in seconds. Set to
0to implement a continuous block. Default is0.
Inputs and Outputs
The input signal must be a Boolean signal. The output is Boolean.
Characteristics
| Direct Feedthrough | Yes |
| Sample Time | Specified in the Sample Time parameter |
| Scalar Expansion | Yes, of parameters |
| Dimensionalized | Yes |
| Zero-Crossing Detection | Yes (in continuous-time domain) |
Examples
The power_Logic example
shows the operation of the monostable flip-flop.
The model sample time is parameterized with the variable Ts (default value Ts = 5e-3). To simulate a continuous Monostable block, specify Ts = 0 in the MATLAB® Command Window.