Safety detection circuit, equipment and detection method based on pulse contraction delay chain

The invention provides a safety detection circuit, device and detection method based on a pulse contraction delay chain, the safety detection circuit comprises a clock frequency division unit, a pulse contraction unit, a pulse recovery unit and a multiplexer, the clock frequency division unit is used for carrying out frequency division on an input clock CLKIN to obtain a frequency division clock CLKDIV, and the frequency division clock CLKDIV is used as a control clock of the pulse recovery unit; the pulse control module is also used for performing pulse control on the frequency division clock CLKDIV to obtain a pulse clock CLKOUT; the pulse contraction unit comprises a plurality of pulse contraction stages and is used for carrying out stage-by-stage pulse contraction on a pulse clock CLKOUT to obtain a multi-bit linkage signal; the pulse recovery unit is used for processing the multi-bit linkage signal to obtain a group of multi-bit state values used for distinguishing pulse and non-pulse; and the multiplexe