Hello,
I am designing a small heater / cooler unit that users a Peltier Thermoelectric (TEC) device (12V, 60W). I've used the 'standard approach' of two - relay (SPDT) connections with the load connected across the common on each. What I want to do also is switch on the fans (12V 1.5W) * 2 when I turn on the TEC either to heat or to cool (based on which way round the current flows). However, I require the fans to spin in the same direction irrespective of which way round this power is being delivered to the TEC. I have been trying to draw a circuit with diodes and things for a couple of hours and I'm either missing something, or it's more advanced than I thought it would be. Has anyone got any pointers please.
Cheers
Murrough
I am designing a small heater / cooler unit that users a Peltier Thermoelectric (TEC) device (12V, 60W). I've used the 'standard approach' of two - relay (SPDT) connections with the load connected across the common on each. What I want to do also is switch on the fans (12V 1.5W) * 2 when I turn on the TEC either to heat or to cool (based on which way round the current flows). However, I require the fans to spin in the same direction irrespective of which way round this power is being delivered to the TEC. I have been trying to draw a circuit with diodes and things for a couple of hours and I'm either missing something, or it's more advanced than I thought it would be. Has anyone got any pointers please.
Cheers
Murrough