I have designed an h-bridge to run a TEC element. The circuit outputs
- output current is 4A
- output voltage is 4V
- Runs on PWM with frequency 5kHz
- Load resistance is 75Ω
I wanted to linearize the output from the h-bridge before feeding it to the load, so I am trying to design a LC filter.
I am confused on two points:
- What values to select for L & C?
- Where to connect the negative leg of capacitor? (Should i ground it or connect it to the lower pin on h-bridge circuit?)
I had selected inductor of 560uH and 4.7uF capacitor after alot of reading on the internet, but it didnt help at all. Also the inductor had a resistance of .65Ω, wouldn't that effect my output as well?