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Digital controlled AC current source design ?

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kehribar

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Hi everyone,

I want to make an AC current source design for driving solenoids.

I want to change its frequency by a microcontroller. Vin should be around 3.3 volts, and Iout max should be 300mA. Output frequency range would swing around 50-200 hz.

Thanks for any advice in advance.
k.
 

How about an H-bridge configuration, directly controlled by the microcontroller?
With a timer interrupt or PWM type of outputs (at 50% duty cycle), you can easily control the frequency in the range you mentioned.
You can add a fixed current limiter (300mA) at the supply of the H-Bridge.
If you don't like the square wave output, maybe you can add a 1:1 transformer.
With some types of transformers, you can reduce the H-Bridge configuration to 2 transistors only.
 

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