Safe analog voltage acquisition implementation circuit

A safe analog voltage acquisition circuit comprises a hardware heterogeneous circuit, including an A-series hardware circuit, a B-series hardware circuit, a reverse circuit and an intersystem isolation unit. The A-series hardware circuit and the B-series hardware circuit form a symmetrical two-out-of-two structure, and an input end is connected with the A-series hardware circuit and is connected with the B-series hardware circuit after passing through the reverse circuit. The A-series hardware circuit and the B-series hardware circuit are also connected through an intersystem isolation unit. Each of the A-series hardware circuit and the B-series hardware circuit comprises a protection circuit, a differential filter circuit, a differential amplification circuit, a low-pass filter circuit, an AD acquisition circuit, an acquisition circuit power supply unit, a safety part power supply unit, a safety circuit and acquisition circuit isolation unit and a logic processing unit which are sequentially arranged. The tw