Hi,
I have a requirement to short circuit two terminals of a small generator using PWM signal. My requirement is explained in detail bellow.
1. I have small permanent magnet generator. Max power generation is about 40W. Open cct voltage is about 50V and short circuit current is about 3.5A per winding.
2. Generator has 2 separate windings at 180degree angle
3. I need to short-circuit each winding separately while the generator is running. (two separate circuits short-circuited at same time)
4. Short circuit needed to be achieved via PWM control signal (or analog voltage proportional to PWM duty cycle)
5. PWM frequency should be at least 15kHz. (56kHz preferred) I will use 0 to 100% duty cycle. PWM duty cycle will be updated by my controller at 1kHz rate.
I looked at SSR and their switching frequencies are in the range of 60Hz and too slow for my work.
Using some H-bridge motor driver (L298 like) was looked at. I thought to short circuit motor terminals of the motor driver and connect the motor power source to a winding of my generator. But the problem is when the short occurs, the voltage across winding reach zero. At this point, can the motor driver maintain short circuit?
Please give me possible solutions.
Thanks in advance.