
Switch-mode power supplies (SMPS) are highly efficient, but they often produce unwanted noise or ripple at the output. This can interfere with sensitive components in your projects. The good news is that output filtering can reduce these disturbances and give you clean, stable power.
The Problem :
When an SMPS operates, it switches on and off rapidly, generating high-frequency noise. This noise can ripple into your output voltage, affecting the performance of circuits like audio amplifiers or microcontrollers.
The Solution :
To fix this, output filters are used to smooth the voltage and eliminate noise. A common approach is to use capacitors and inductors. Adding a low ESR (equivalent series resistance) capacitor at the output of the SMPS helps reduce high-frequency ripple. Additionally, placing an inductor between the capacitor and the load further smooths the power.
Practical Example :
Suppose your SMPS output has a ripple of 0.5V, and your device requires 5V. To filter the noise, add a 470µF capacitor in parallel with a 0.1µF ceramic capacitor at the output. This helps reduce ripple by 90%.
Sample Calculation :
If your device consumes 2A, and the ripple current through the capacitor is 0.1A, the ripple voltage across a 470µF capacitor is:
Ripple voltage (V) = I × ESR = 0.1A × 0.2Ω = 0.02V,reducing the ripple significantly.
Product Suggestions :
Shop now at SmartXProKits.in
Support our work and India’s innovation—buy from our Make in India site!
Written by smartxbrains
- Industrial Automation141141 products
- Cooling Fan44 products
- Indicators1111 products
- Plastic Casing66 products
- Sensor2323 products
- Sleeve and cables55 products
- SMPS88 products
- Solid State Relay Module22 products
- Switches1818 products
- Temprature Sensor11 product
- 3D Printing189189 products
- 3D printing118118 products
- Combination Kit4747 products
- Electronic743743 products
- Audio55 products
- Battery/Charger Accessories2828 products
- Capacitors6464 products
- Connector4646 products
- cooling fan11 product
- Diode3535 products
- Displays1212 products
- IC and Chips6565 products
- IOT and Wireless99 products
- Leds2424 products
- Microcontrollers55 products
- Modules/Shield7575 products
- MOSFET / IGBT1414 products
- Power Supply2525 products
- Resistors130130 products
- Sensors5959 products
- SMD2828 products
- Switches1414 products
- Transistors6868 products
- Wire and Cables1212 products
- Hardware3232 products
- Hand Tools1414 products
- Hardware Accessories1414 products
- Printing22 products
- RC Plane and Drone99 products
- Robotic147147 products
- BO Motors1313 products
- General Purpose DC Motors2929 products
- Motor Drivers88 products
- Robotic Wheels & Tyres1414 products
- Servo Motor2727 products
- Stepper Motors88 products
- Synchronous Motor11 product
- Science Fair Project7070 products
- Final Year Ready Project Kit11 product
- STEM KIT2222 products
- E Books88 products
Leave a Reply
You must be logged in to post a comment.