The present invention relates to a speed control controller
analog signal input acquisition circuit and a
functional safety guarantee method thereof, which includes an
analog signal input protection circuit, a dual-channel redundant
signal sampling and acquisition circuit, a digital isolation circuit, and a
functional safety CPU circuit, wherein the dual-channel redundant
signal sampling and acquisition circuit includes a
signal sampling and acquisition circuit A and a signal sampling and acquisition circuit B; the
functional safety CPU circuit has built-in functional safety
software, which calculates and distinguishes the received
analog signal input acquisition results, realizes real-time monitoring of analog input faults, and triggers alarms or safety failure protection according to the severity of the fault, thereby ensuring the functional safety of a digital
electronic speed control controller. The dual-channel redundant signal sampling and acquisition circuit designed by the present invention is relatively independent, and not only realizes abnormal monitoring of the sampling function of its
data acquisition chip by sampling its own reference
voltage, but also realizes mutual supervision by collecting the working status of the
power supply voltage and reference
voltage of the other party's
data acquisition chip.