A　single-phase　chopper-controlled　Alternating　Current　(AC)　voltage　regulator　circuit　is　designed　for　36　V　low-voltage　application　scenarios.　The　study　involves　theoretical　analysis,　simulation　modeling,　and　experimental　verification,　addressing　main　circuit　design,　control　strategy　optimization,　sampling　circuit　configuration,　and　parameter　tuning.　A　bidirectional　switching　device,　composed　of　a　fully　controlled　switch　and　a　diode,　is　used　to　implement　Pulse　Width　Modulation　(PWM)　chopper　control　combined　with　Proportional-Integral　(PI)　closed-loop　regulation,　enabling　an　adjustable　output　voltage　from　1　V　to　25　V.　The　LC　filter　parameters　and　sampling　circuit　are　optimized　through　simulations　in　MATLAB　and　Proteus.　Experimental　results　show　that　the　circuit　maintains　an　output　voltage　error　within　±0.3　V　under　closed-loop　control,　exhibiting　stable　performance　and　high　applicability　for　low-voltage　AC　regulation.　©　2025　IEEE.