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Method for PSU of led bulb from 230V

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varunme

varunme

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how can we make the PSU for LED bulb series from 230V ?,

Is it safe to go with transformer less ?
what does the cheap bulbs from market do for the PSU : ?
 

varunme said:
how can we make the PSU for LED bulb series from 230V ?,

Is it safe to go with transformer less ?
what does the cheap bulbs from market do for the PSU : ?
Click to expand...

Cheaper products have voltage lowering with capacitor and resistor in parallel, and products with higher quality have small SMPS inside.

Transformeless is not safe!

Mains Powered White LED Lamp
http://www.extremecircuits.net/2010/07/mains-powered-white-led-lamp.html

White_LED_Lamp_Circuit_Diagram.GIF


If You have enough skills You can make small SMPS inside bulb case.




See this material:

Which Power Switching Topology is Right for You?
Balancing Efficiency and Thermal Design in LED Lighting
**broken link removed**



See this simple SMPS, can be adjusted on secundar to different voltages if needed and all can be very small:

Simplest switched power supply ever with TNY267
http://danyk.cz/impulz4_en.html

impulz4.png





;-)
 
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what should i do if i need more current ?
 

varunme said:
what should i do if i need more current ?
Click to expand...

This circuit from Danyk web support up to 13W, this is above transformeless capabilities. If you need more power use bigger trafo core, stronger wires, use higher numbers of TNY IC. The higher part the number, the higher the potential power.

Also take in mind that power leds need some cooling heatsink, 10W of led on small area and space is not easy to cooldown, consider special case for that led bulb.

2_1332206718728_m.jpg
 
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