Author Topic: Solving inductor whine in a HV DC AC inveter for EL panels  (Read 994 times)

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Offline robint91

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Solving inductor whine in a HV DC AC inveter for EL panels
« on: December 28, 2015, 07:47:33 am »
I have designed a HV DC AC inverter for EL panels, Which can generate around 200 Vrms 2 kHz AC. But when I use it there is a lot inductor whine coming from the LC filter I guess. My EL panels needs around these voltages/frequencies to decently light up.

Does anyone have an idea how to solve it? I have used these inductors and a good film capacitor.

I start of with a supply of 24 Volts and boost that up to around 200 Volt which then goes into a High voltage H-Bridge. The Inverter is driven by a two level pwm generated from the MCU. The PWM switching frequency is around 50 kHz. I have tried to make that higher but it only will heat up the mosfets quite a lot.

I need a decent sinewave because I use MOC3063 and Triac to switch the AC else a large dv/dt would retrigger the SSR and I couldn't turn that particular panel off.

Thank you


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