Self-locking detection circuit and device and control method

The invention discloses a self-locking detection circuit and device and a control method, the self-locking detection circuit comprises a self-locking circuit and a detection circuit, the self-locking circuit comprises a three-terminal transistor group and a first input end, the three-terminal transistor group comprises a first transistor and a second transistor, and the detection circuit comprises a pull-up resistor, a bleeder resistor and a third transistor. The first end of the pull-up resistor is provided with a first terminal used for signal output, the third end of the third transistor is provided with a second terminal used for signal output, the first input end is arranged between the first end of the third transistor and the first terminal, and the first input end is used for receiving a level signal output by a controller. The invention provides a self-locking detection circuit, a self-locking detection device and a control method, which have the characteristics of interference prevention, high relia