Remote power supply and capacitor
Capacitors are essential in remote-sensed power supply setups to stabilize voltage, reduce noise, and handle dynamic loads effectively.
Purpose of Remote Sensing
Remote sensing allows a power supply to measure voltage directly at the load rather than at the supply terminals, compensating for voltage drops caused by wiring resistance, connectors, or PCB traces. This ensures the load receives the intended voltage, which is critical for high-current or sensitive applications ( ).
Role of Capacitors
Capacitors are used in remote sensing circuits to filter high-frequency noise and stabilize voltage at the load:
- Dynamic Load Handling: When the load current changes rapidly (above 1 kHz), the feedback loop can misinterpret voltage fluctuations, causing oscillations. Placing a capacitor at the remote load smooths these rapid changes ( ).
- Bypass Function: The capacitor acts as a local energy reservoir, reducing ripple and noise drawn from the transmission path, improving the accuracy of the sensed voltage ( ).
- High-Frequency Filtering: Adding a high-frequency bypass capacitor at the power supply output further mitigates oscillations and stabilizes the system ( ).
Capacitor Selection Guidelines
To ensure effective operation:
- Rated Ripple Current: The capacitor should handle at least 0.2 times the maximum output current of the power supply (Iripple ≥ 0.2 × Iout) ( ).
- Voltage Rating: The capacitor's rated voltage must exceed the maximum output voltage to prevent degradation ( ).
- Placement: Connect the capacitor directly at the remote load terminals where the +S and -S sense wires meet the load. This placement ensures the feedback loop receives a clean signal ( ).
Wiring Best Practices
- Use twisted-pair wires for +S and -S sense lines to minimize electromagnetic interference (EMI) ( ).
- Keep sense wires physically separated from AC input and heavy DC output cables to avoid inductive noise coupling ( ).
- Connect +S to the positive load terminal and -S to the negative terminal ( ).
Practical Example
In high-speed pulsed applications, such as LED testing at 2 kHz, long cables can cause voltage drops and inject high-frequency noise. By twisting sense wires and placing a properly rated capacitor at the load, the power supply receives a clean feedback signal, preventing voltage overshoot and ensuring stable operation ( ).
Summary
Using capacitors in remote-sensed power supply systems is crucial for voltage stability, noise reduction, and accurate feedback. Proper capacitor selection, placement, and wiring practices ensure reliable operation, especially under dynamic or high-frequency load conditions.
Cost price Remote Sensing Guide: Sizing Capacitors & Reducing Noise
Learn how to properly configure the Remote Sensing function on power supplies. Discover best practices for wiring
Cost price Capacitive power supply
A capacitive power supply or capacitive dropper is a type of power supply that uses the capacitive reactance of a capacitor to reduce
Cost price Why Bother with Remote Sensing in DC Power Supplies
All EA Elektro-Automatik (EA) DC programmable power supplies have remote sensing. EA programmable power
Cost price Benefits of Line Capacitors Extended by Remote Automatic Control
The application of pole-mounted capacitors up to the economic limit for the system is practicable with the control system here
Cost price Decoupling Capacitor Placement Guidelines | Sierra Circuits
Precise decoupling capacitor placement ensures stable voltage, reduces noise, improves power and signal integrity in
Cost price Everything for Capacitive Power Supplies | Mouser
Designs based on capacitive topologies are particularly suitable for power supplies in the milliwatt range. They are simple, compact
Cost price Remote Power Systems | Cence Power
What is a remote power system? How do they work? And what options are available to supply loads with the power they need?
Cost price Remote Sensing for Power Supplies: Design & Oscillation Mitigation
Explore remote sensing techniques for power supplies, including design considerations and oscillation mitigation strategies. Learn
Cost price A few things you should know before using the Remote Sensing
Also, keep the wires off the AC and output cables to prevent noise interference.Add capacitors at output end where the Remote
Cost price Remote sensing for power supplies
It is important for a dynamic load such as a gate driver to split the output capacitance between the supply and the remote load. The
Cost price AN954, Transformerless Power Supplies: Resistive and Capacitive
The two basic types of transformerless power supplies are resistive and capacitive. This application note will discuss
Cost price Remote Sensing in Power Supplies: How It Works and Why It Matters
Learn how remote sensing in power supplies ensures accurate voltage delivery, boosts efficiency, and enhances
Cost price Everything for capacitive power supplies from a single source
One possibility for supplying small loads from the AC power supply that is not only elegant, but also simple and cost-effective, is to
Cost price How to remotely sense our power supply
High-Frequency Bypass Capacitors: Adding a high-frequency bypass capacitor at the local power supply also has
Cost price Improve Voltage Regulation Using Remote Sense | Keysight
Learn how to use remote sense to improve voltage regulation significantly. Most measurements assume steady voltage regulation.
Cost price Uninterruptible power supply FAQ
Uninterruptible power supply FAQ Dive into the essential aspects of Uninterruptible Power Supplies (UPS) to ensure you safeguard
Cost price Capacitor types
Capacitors, together with resistors and inductors, belong to the group of passive components in electronic
Cost price Power Supply "Remote Sense" Mistakes and Remedies
Remote Sense feature automatically compensates for unwanted output cable drops, which
Cost price What is a DC Power Supply?
What is a DC power supply? Learn how it works, key types, specs, and tips for choosing,
Cost price dcan-58.pdf
There are numerous factors to consider when adding external capacitors to switched-mode power supplies (SMPS). This article will
Cost price How to remotely sense our power supply
A high-frequency bypass capacitor, C bypass, can easily address this situation. It filters out the high-frequency
Cost price What''s the Difference Between Local and Remote Power Supplies?
Learn the difference between local and remote power supplies in our Journal post. As always, we recommend consulting an
Cost price Understanding remote sense in today''s power supplies
Remote sense provides a straightforward way to correct them by letting the supply monitor
Cost price How to implement remote sense in your PMIC
A good place to route the sense connection is to one of the bulk capacitors, getting as close as possible to the processor supply pin.
Cost price Power Supply Based on Carbon Ultracapacitors for Remote Supervision
Request PDF | Power Supply Based on Carbon Ultracapacitors for Remote Supervision Systems | The capacity to store
Cost price ANP124 | Capacitive Power Supplies: Selecting the Input Capacitor
There are several names of similar circuits: capacitive power supplies, capacitive droppers, and transformerless power supplies.
Cost price Supercapacitors for remote RF transmission
Supercapacitors for remote RF transmission RF transmission is commonly used to communicate data, status and position