Battery Charger with Capacitor?

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TwoBlocked

TwoBlocked

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Location
Bradford County, PA
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Industrial Electrician
Have always wondered just how battery chargers that have a transformer coil going to a capacitor work. Like this one for example. One thing I do know is ya gotta have the correct size capacitor. Bigger is not better, unless you like magic smoke. damhik. I think it has something to do with partially saturating the core of the transformer to control the charging current, Can anyone point me in the right direction to understand this type of circuit?

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The way I've always understood it is the auxiliary winding and the capacitor ate a tuned tank circuit. It has a frequency that is determined by the values of the induction of the transformer winding and the value of the capacitor. The current in the auxiliary winding in the transformer either boosts or bucks the magnetic field keeping the secondary at a constant voltage.

Changing the value of the capacitor should change the resonant frequency of the tank circuit and adjust the output voltage
 
Joethemechanic said:
The way I've always understood it is the auxiliary winding and the capacitor ate a tuned tank circuit. It has a frequency that is determined by the values of the induction of the transformer winding and the value of the capacitor. The current in the auxiliary winding in the transformer either boosts or bucks the magnetic field keeping the secondary at a constant voltage.

Changing the value of the capacitor should change the resonant frequency of the tank circuit and adjust the output voltage
Click to expand...
Maybe... the capacitor's reactance won't change during a change in charging load, but the inductance of the coil might. Could there be a negative feedback loop between the magnetic flux of the secondary and the magnetic flux of the auxiliary winding? But we don't want either a constant voltage nor a constant current from the charging circuit, but one where they both change as the battery get charged. And would the tank circuit of the auxiliary coil and capacitor necessarily be tuned to 60 hz? I don't know. Might work best on an "inductive slope" as the auxiliary and secondary coils interact through their magnetic fluxes.
 
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