LVDT (Linear Variable Differential Transformer) signal acquisition device and overload resisting method thereof

The invention provides an LVDT (Linear Variable Differential Transformer) signal acquisition device and an overload resisting method thereof. The LVDT signal acquisition device comprises a shell, wherein the shell internally comprises a circuit board, the bottom of the shell is provided with a port, and the circuit board is connected with the port; the circuit board comprises a lithium battery charging and discharging circuit, an LVDT signal modulation and demodulation circuit, an acquisition and storage circuit and a bus communication circuit, and the port is provided with a power supply interface, a communication interface and a sensor interface; the lithium battery charging and discharging circuit provides a power supply for the circuit board, the LVDT modulation and demodulation circuit provides an excitation power supply for an LVDT sensor, and modulates and demodulates LVDT output signals into analog signals, and the analog signals are acquired by an A/D acquisition card; the acquisition and storage cir