What is PID feedback?

PID feedback is a common feedback control algorithm, and its full name is Proportional-Integral-Derivative feedback control. It is widely used in medical device production equipment, such as tip forming machines, catheter welding machines, catheter reflow machines, etc.

Principle of PID feedback control:

  • Proportional term:
    Generates a feedback adjustment amount proportional to the size of the error signal.
    It can respond and correct deviations quickly, but cannot eliminate steady-state errors.
  • Integral term:
    Generates feedback adjustment amount based on the cumulative integral of the error signal.
    It can eliminate steady-state errors and improve system stability.
  • Derivative term:
    Generates feedback adjustment amount based on the rate of change of the error signal.
    It can predict the deviation change trend of the system and improve response speed and stability.

These three items form a high-performance PID feedback control algorithm through reasonable weighted combination. Moreover, By adjusting the three parameters of proportion, integration and differentiation, the response characteristics of the system can be optimized and the control accuracy and stability can be improved.

PID feedback is widely used in various automatic control systems, such as temperature control, position control, speed control, etc. It is one of the most commonly used feedback control algorithms in industrial automation and process control.

PID feedback

Tip forming Machine PID feedback:

For example a tip forming machine, we want to control it at a specific target temperature. The PID controller can help us achieve this.

  • Proportional part (P): The proportional part regulates the power of the heater according to how far the current temperature deviates from the target temperature. If the current temperature is far from the target temperature, then the proportional section produces a larger control output to speed up the approach to the target temperature.
  • Integral section (I): The integral section takes into account the accumulation of temperature deviations. If there is a steady state error, i.e. a persistent small deviation even though the proportional part has adjusted to the best of its ability, the integral part will gradually increase the control output to eliminate this persistent deviation.
  • Differential Section (D): The differential section regulates the control output according to the rate of temperature change. If the temperature is changing rapidly, thereby the differential section produces a larger control output to slow down the rate of temperature change to avoid overshoot or oscillation.
PID Control 2

By using these three sections, the PID controller allows the temperature of the tipformer to approach the target temperature quickly and consistently, and to remain stable once the target temperature is reached.

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