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Synchronized and isolated capacitor charger

Juliap
on Sep 20, 2019

Hi,

I need to design an isolated capacitor charger which is externally synchronizable. The input voltage range is 20-50V and I need to deliver around 200W of charge power. The final capacitor voltage is 250V.

Many of the ICs I found are flybacks without external synchronization. Some other non-charger ICs seem to have features that prevent them from being used as chargers.

Can you recommend a suitable IC?

Regards, Julia

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    •  Analog Employees 
    on Oct 1, 2019 3:02 AM over 1 year ago

    Hi Julia,

    Request is very interesting.  It has several items that are unique:

    1. Synchronizing an isolated supply is very rare.
    2. Isolated current sources are very rare.
    3. Based on the wide output range, some form of flyback will be needed.

    Short answer, we do not have parts to solve this problem. Part to look at are the LT3750 and LT3751 for the capacitor charging. They are boundary mode so the frequency is variable. Circuits could be added to make it isolated. I recommend that you reach out to a local ADI sales team if you need further help.

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  • 0
    •  Analog Employees 
    on Oct 1, 2019 3:02 AM over 1 year ago

    Hi Julia,

    Request is very interesting.  It has several items that are unique:

    1. Synchronizing an isolated supply is very rare.
    2. Isolated current sources are very rare.
    3. Based on the wide output range, some form of flyback will be needed.

    Short answer, we do not have parts to solve this problem. Part to look at are the LT3750 and LT3751 for the capacitor charging. They are boundary mode so the frequency is variable. Circuits could be added to make it isolated. I recommend that you reach out to a local ADI sales team if you need further help.

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