No V ir I sensing in lamp driver
No V ir I sensing in lamp driver
(OP)
Dear All,
In the following App Note...
http://w ww.st.com/ stonline/p roducts/li terature/a n/5656.htm
....a schematic is given for an electronic lamp ballast using switch mode PFC and PWM stages.
I am wondering why the PWM stage (which supplies the lamp) has no output voltage feedback sensing and no output current sensing? This seems to go against the norm for SMPS's and i was wondering if readers knew how they get away with it.
In the following App Note...
http://w
....a schematic is given for an electronic lamp ballast using switch mode PFC and PWM stages.
I am wondering why the PWM stage (which supplies the lamp) has no output voltage feedback sensing and no output current sensing? This seems to go against the norm for SMPS's and i was wondering if readers knew how they get away with it.





RE: No V ir I sensing in lamp driver
The ignition method using a frequency shift to excite the L-C resonance and thus develop striking voltage is something I used over ten years ago in a little demonstrator for contactless energy transfer. Works beautifully on the compact lamps.
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