數位控制（二）.

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Interfacing to the Analog World
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Presentation transcript:

數位控制（二）

Introduction to Discrete-Time Control System Digital Controller Use of digital controller Decision-making capability Low cost digital computer Optimal performance Plant: a physical object to be controlled. Furnace, Reactor, Servo system, spacecraft Process: a series of gradual changes that succeed one another.

Signals Sampling process Continuous-time signal Sampled-data signal Digital signal Discrete-time signal Sampling process Quantization A sequence of value at discrete time points Denoted by kT or tk (k = 0,1, 2,…) Sampling rate

Signals

Digital control system

Data Acquisition and Data Distribution

Transducer Amplifier Amplify the voltage of the transducer Convert a current signal to a voltage signal A buffer Low-pass filter: attenuate the high-frequency signal, such as noise signals. Analog multiplexer De-multiplexer

Analog multiplexer

Sample-and-Hold (S/H)

Analog-to-Digital Converter (ADC) Successive-approximation type Integrating type Counter type Parallel type

Offset error Linearity error Gain error

Digital-to-Analog Converter (DAC) Weighted resistors

R-2R ladder circuit

hold Zero-order hold, First-order hold, Polygonal hold

飛行器控制系統

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