I'm designing a circuit to drive a single coil latching relay. This uses two MOSFETs, arranged so current flows one way through the relay coil to switch it on, and then the other MOSFET activates to reverse the coil current to switch the relay off. Both switch on and switch off is only a short duration, as the relay holds its set/reset state without coil current.
So to my question: Are free wheeling diodes required to deal with the back EMF when the current is switched off? If so, how could they be arranged, as the polarity of the coil reverses depending on which mosfet has operated?