Plugging detection method and plugging detection circuit of VGA (Video Graphics Array) interface

The invention provides a plugging detection method and a plugging detection circuit of a VGA (Video Graphics Array) interface, the method is applied to the plugging detection circuit of the VGA interface, and the plugging detection circuit comprises a voltage comparison circuit, an external resistor and a signal processing circuit; the method comprises the following steps: acquiring a voltage value of a VGA interface output R/G/B channel in a preset detection area of a VGA communication blanking period; detecting the plugging state of the VGA interface according to the relation between the voltage value and a preset reference voltage; the reference voltage is determined according to the resistance of the external resistor. According to the invention, the plugging state of the VGA interface is detected through the relation between the voltage value of the R/G/B channel output by the VGA interface and the reference voltage, and hot plugging of the VGA interface is realized. 本申请提供一种VGA接口的插拔检测方法及插拔检测电路，该方法应用于VGA接