I recently posted a circuit that would be cool to simulate, so I decided to give it a go in a real build. I was hesitant because I knew 1 part was gonna be a big PITA.. And YEP it was! (probably easy for the more advanced than I)
So getting 2 H bridges to output Square Wave AC 90 degrees out of phase is very easy, IF both waves are coming off the same Arduino or control board. But I need these input phases to be fully Isolated from each other, while still maintaining the phase shift. I in no way want the grounds bonded or tied together, as one return line must become the others input feed.
So synchronizing the 2 separate circuits to maintain the phase shift has to be done with no physical wires connecting the 2 circuits. So we need "Wireless Synchronization" between the 2 circuits.
I will be documenting this code in the "Arduino code" section of this forum and will post the link in this thread. I don't want to lose this code..
Update- Code now posted here- REMOVED
The circuit uses 2 Arduino's each with their own H-bridge. And each circuit also has a NRF24L01 Wireless transceiver. The first Arduino is the "Master" and the second is the "Slave". The master creates ordinary square wave AC like a normal H-Bridge, then transmits a 2.4G wireless signal to the receiver on the slave circuit when polarity flips occur. The slave is then programmed to create the same frequency square output, but delay the phase by 90 degrees by synchronizing the timing of the 2 separate circuits with the wireless transmitted message..
Now the first part is done- I have 2 circuits that are outputting 90 degree separated waves in sync with NO bonded ground connection between them.
Next challenge is untangling the input power requirements. These units need to be powered by separate sources with no common ground either. And the logic voltage does not match the H bridge voltage. So each Arduino needs a separate 5V source to power the logic, and the H-bridges need a higher power input. The 5V logic source and H bridge source of each side CAN and MUST share a ground, but the Slave and Master must be separate isolated sources. So I can probably just use 2 batteries or power sources with Buck Converters to throttle it to 5-7V to feed into the VIN of the Arduinos.
So updates will ensure
So getting 2 H bridges to output Square Wave AC 90 degrees out of phase is very easy, IF both waves are coming off the same Arduino or control board. But I need these input phases to be fully Isolated from each other, while still maintaining the phase shift. I in no way want the grounds bonded or tied together, as one return line must become the others input feed.
So synchronizing the 2 separate circuits to maintain the phase shift has to be done with no physical wires connecting the 2 circuits. So we need "Wireless Synchronization" between the 2 circuits.
I will be documenting this code in the "Arduino code" section of this forum and will post the link in this thread. I don't want to lose this code..
Update- Code now posted here- REMOVED
The circuit uses 2 Arduino's each with their own H-bridge. And each circuit also has a NRF24L01 Wireless transceiver. The first Arduino is the "Master" and the second is the "Slave". The master creates ordinary square wave AC like a normal H-Bridge, then transmits a 2.4G wireless signal to the receiver on the slave circuit when polarity flips occur. The slave is then programmed to create the same frequency square output, but delay the phase by 90 degrees by synchronizing the timing of the 2 separate circuits with the wireless transmitted message..
Now the first part is done- I have 2 circuits that are outputting 90 degree separated waves in sync with NO bonded ground connection between them.
Next challenge is untangling the input power requirements. These units need to be powered by separate sources with no common ground either. And the logic voltage does not match the H bridge voltage. So each Arduino needs a separate 5V source to power the logic, and the H-bridges need a higher power input. The 5V logic source and H bridge source of each side CAN and MUST share a ground, but the Slave and Master must be separate isolated sources. So I can probably just use 2 batteries or power sources with Buck Converters to throttle it to 5-7V to feed into the VIN of the Arduinos.
So updates will ensure