Positive-gain PID series-parallel conversion calculator

Calculate equivalent parameter sets [K,Ti,Td] or [Kp,Ki,Kd] JSON with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Use equivalent parameter sets [K,Ti,Td] or [Kp,Ki,Kd] JSON to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Conversion: 0 parallel to series, 1 series to parallel
0
Kp parallel or K series
4
Ki parallel or Ti series
1
Kd parallel or Td series
1
Equivalent parameter sets [K,Ti,Td] or [Kp,Ki,Kd] JSON
[[0.267949192431,0.267949192431,3.73205080757],[3.73205080757,3.73205080757,0.267949192431]]

Try another scenario

Conversion: 0 parallel to series, 1 series to parallel
1
Kp parallel or K series
4
Ki parallel or Ti series
1
Kd parallel or Td series
1
Equivalent parameter sets [K,Ti,Td] or [Kp,Ki,Kd] JSON
[[8,4,4]]
Calculation method

Calculation method

Equivalent parameter sets [K,Ti,Td] or [Kp,Ki,Kd] JSON

Series K(1+1/(Ti s))(1+Td s) expands to parallel Kp+Ki/s+Kd s. Report both positive real series branches when defined; zero integral/derivative cases excluded.

Symbols and units
a
Conversion: 0 parallel to series, 1 series to parallel
b
Kp parallel or K series
c
Ki parallel or Ti series
d
Kd parallel or Td series

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • User-supplied measurements and assumptions; Series K(1+1/(Ti s))(1+Td s) expands to parallel Kp+Ki/s+Kd s. Report both positive real series branches when defined; zero integral/derivative cases excluded. Supported limits: Finite numeric values bounded to 1e9 magnitude; lists and tables contain 1–100 records unless a stricter bound is stated. Inputs use the units shown. Lists explicitly paired by a method must have matching lengths; independent polynomial coefficient vectors may differ. Respect stated physical, interpolation, policy and computational domain limits.
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Further reading

Method reference ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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