Capacitor power supplies or transformerless power supplies are small but effective power supplies for small appliances like sensor boards, microcontroller boards, etc. This type of power supply is small in size, light in weight, and low in cost. Which can replace its counterpart of transformer-based power supply.

Circuit diagram of Capacitor power supply:

In this table below put your values, the calculator will calculate the output result. This Capacitor Power Supply calculator is designed taking the calculation from Application Note AN954.

Input variables:
Line frequency Hz
RMS voltage V
D1 (ZD) breakdown voltage V
C1 nominal capacitance uF
R1 nominal resistance Ohms
D2 forward voltage drop V
C2 capacitaance value uF
C1 tolerance %
R1 tolerance %
Design Results:
Nominal output voltage below current limit V
Output ripple at nominal current mV
Available nominal current mA
Worst case available current mA
Best case available current mA
Worst case R1 power dissipation (pick double) W
Worst case D1 power dissipation (pick double) W
Worst case D2 power dissipation (pick double) W
Minimum rated voltage for C1 (pick double) V
Total consumed power max W

You can also read this article for the explanation of this Capacitor Power Supply calculator: Transformerless power supply design guide in detail with calculator

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Conclusion:

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MKDas

Mithun K. Das. B.Sc. in Electrical and Electronic Engineering (EEE) from KUET. Senior Embedded Systems Designer at a leading international company. Welcome to my personal blog! I share articles on various electronics topics, breaking them down into simple and easy-to-understand explanations, especially for beginners. My goal is to make learning electronics accessible and enjoyable for everyone. If you have any questions or need further assistance, feel free to reach out through the Contact Us page. Thank you for visiting, and happy learning!

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