rikotech8
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Hello everyone.
I have to develop a PWM that will supply fuel cell (or something like that). This is the customer's concept: Transformer (220VAC to 15VAC) - rectifier - PWM - fuel cell.
The PWM module should regulate the average value of the output voltage. Note that the output voltage should be rectified, but not filtered.The transformer, rectifier and the MCU that will produce the pulses are familiar to me and have no troubles with creating that part of the ware. I will program PIC MCU to produce the square pulses. I am rather worried about the power part/driver that will "amplify" the PWM signal. Shall I have inductance, reverse diode, what kind of transistors should be used. I consider the frequency of the PWM to be greater than 20KHz in order to avoid hearing noise. I do have certain electronic knowledge, but I have not much experience in creating power electronics. If you need more information, don't hesitate to ask. Any help would be much appreciated. Thank you.
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https://drive.google.com/file/d/0B_EYtdS7J5eKcXI3dm96N3pvQVk/view?usp=sharing This image is just a demo of PWM driver I just drew to make the question clearer. The enclosed part of the schematic is the one I am not sure how to implement so to withstand power of 5-15V/35A.
I have to develop a PWM that will supply fuel cell (or something like that). This is the customer's concept: Transformer (220VAC to 15VAC) - rectifier - PWM - fuel cell.
The PWM module should regulate the average value of the output voltage. Note that the output voltage should be rectified, but not filtered.The transformer, rectifier and the MCU that will produce the pulses are familiar to me and have no troubles with creating that part of the ware. I will program PIC MCU to produce the square pulses. I am rather worried about the power part/driver that will "amplify" the PWM signal. Shall I have inductance, reverse diode, what kind of transistors should be used. I consider the frequency of the PWM to be greater than 20KHz in order to avoid hearing noise. I do have certain electronic knowledge, but I have not much experience in creating power electronics. If you need more information, don't hesitate to ask. Any help would be much appreciated. Thank you.
- - - Updated - - -
https://drive.google.com/file/d/0B_EYtdS7J5eKcXI3dm96N3pvQVk/view?usp=sharing This image is just a demo of PWM driver I just drew to make the question clearer. The enclosed part of the schematic is the one I am not sure how to implement so to withstand power of 5-15V/35A.