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Registered Member #505
Joined: Sun Nov 19 2006, 06:42PM
Location: Yorkshire!
Posts: 329
Conundrum wrote ...
For your information, I found out how to parallel CCFL units so the outputs add together, generating 2000+V at several hundred mA to an amp. ... I had five working at once and so far they seem stable; without the resistors this does not work and the transistors fry.
2000V * 700mA = 1.4kW? Are you sure?
Even if they are high power CCFL inverters, I would have thought that 10mA would have been a decent output current per inverter.
Better to use a series high voltage capacitor instead of a resistor because it is lossless. Select a value that gives you the reactance equivalent to the resistance you reqire using 1 / ( 2 * pi * f * C ). Ceramic cap for preference.
Not puting impedance in the inverter output will cause one inverter to try and supply more output current - too much and *pop* unless thre is some curent or power limit bult in to the control circuit.
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Parallel connected CCFLs
