Detection circuit, ECG detection apparatus, and wearable device

An electrocardiogram (ECG) detection apparatus, comprising a first detection electrode, a second detection electrode, a third detection electrode and a detection circuit, the detection circuit comprising a first load module, a second load module, a third load module, a first detection module, a second detection module and an obtaining module;

• wherein,
• a first end of the first load module is configured to be coupled to a first voltage level, a first end of the second load module is configured to be coupled to a second voltage level, a second end of the first load module is configured to connect to the first detection electrode, a second end of the second load module is configured to connect to the second detection electrode, a first end of the third load module is configured to be coupled to a third voltage level, and a second end of the third load module is configured to connect to the third detection electrode;
• an input end of the first detection module is connected to a junction of the first detection electrode and the first load module, an output end of the first detection module is connected to the obtaining module, an input end of the second detection module is connected to a junction of the second detection electrode and the second load module, an output end of the second detection module is connected to the obtaining module, and each of the first voltage level and the second voltage level is different from the third voltage level;
• and
• the obtaining module is configured to at least obtain an electrical signal output by the first detection module and an electrical signal output by the second detection module, to determine a wearing state or a non-wearing state of the first detection electrode, the second detection electrode and the third detection electrode.

A wearable device, comprising a first detection electrode, a second detection electrode, a third detection electrode and a detection circuit, the detection circuit comprising a first load module, a second load module, a third load module, a first detection module, a second detection module and an obtaining module;

• wherein,
• a first end of the first load module is configured to be coupled to a first voltage level, a first end of the second load module is configured to be coupled to a second voltage level, a second end of the first load module is configured to connect to the first detection electrode, a second end of the second load module is configured to connect to the second detection electrode, a first end of the third load module is configured to be coupled to a third voltage level, and a second end of the third load module is configured to connect to the third detection electrode;
• an input end of the first detection module is connected to a junction of the first detection electrode and the first load module, an output end of the first detection module is connected to the obtaining module, an input end of the second detection module is connected to a junction of the second detection electrode and the second load module, an output end of the second detection module is connected to the obtaining module, and each of the first voltage level and the second voltage level is different from the third voltage level;
• and
• the obtaining module is configured to at least obtain an electrical signal output by the first detection module and an electrical signal output by the second detection module, to determine a wearing state or a non-wearing state of the first detection electrode, the second detection electrode and the third detection electrode.