To improve reliability some systems adopt double redundancy; however, some failure conditions may prevent the normal operation of the machine or the machine to reach a safe state. The method proposed in this paper allows the normal operation of the system even in a fault condition of the control unit. The signals resulting from the parallel execution of code are modulated to a higher frequency and decoupled from each control stage using two capacitors; the information is then demodulated to obtain the control signal, either in the case of one or two branches working in the control unit.
Fault tolerant PWM generation with double-redundant logic / Troni, F.; Concari, C.; Toscani, A.; Buticchi, G.; Franceschini, G.. - 1(2014), pp. 495-502. [10.2495/AMITP20130581]
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