The invention discloses a static-error-free automatic feedback high-precision fault inversion method, and the method comprises the steps: setting a preset short-circuit, grounding and anti-misoperation fault scene, applying high-fidelity
voltage and current signals to a primary side through the control of
software and hardware, verifying the fault research and judgment and
processing functions andperformances of an intelligent switch, verifying the fault
processing capability of a single device, in the hardware level, enabling the fault inversion test
system to transmit the load side impedance to the source side through an impedance transmission mode, the control current adopts a current feedback mode, and through a fast-response static-error-free automatic
feedback control circuit, driving a large-current MOS tube to generate nonlinear
voltage to drive a load loop to obtain a high-precision primary
signal, and then obtaining a high-precision measurement result in a two-path multi-channel high-precision synchronous sampling measurement mode; in the
software level, for the steady-state
signal, recovering the output
signal once in real time, and enabling the
voltage and current power source to perform compensation correction according to the load difference of the switch to be tested; for a
transient signal, enabling the voltage and current power source to periodically perform amplitude and phase calibration setting according to the current output range in a segmented manner.