Abstract: A sensing circuit (51) including a connection terminal (514) configured to couple with an electrode (32) located on a housing of a mechanical device; and a detection circuit (513) configured to couple with the connection terminal (514) to detect a distance between the electrode (32) and an external conductor or a change of the distance between the electrode and an external conductor by utilizing a capacitance between the electrode (32) and the external conductor or a change of the capacitance between the electrode (32) and the external conductor, thus obtaining an electrical signal representing the distance between the electrode (32) and the external conductor or a change of the distance between the electrode (32) and the external conductor. The sensing circuit can perform non-contact distance detection on a grounded object.

Abstract: A sensing circuit (51) including a connection terminal (514) configured to couple with an electrode (32) located on a housing of a mechanical device; and a detection circuit (513) configured to couple with the connection terminal (514) to detect a distance between the electrode (32) and an external conductor or a change of the distance between the electrode and an external conductor by utilizing a capacitance between the electrode (32) and the external conductor or a change of the capacitance between the electrode (32) and the external conductor, thus obtaining an electrical signal representing the distance between the electrode (32) and the external conductor or a change of the distance between the electrode (32) and the external conductor. The sensing circuit can perform non-contact distance detection on a grounded object.

Abstract: A method for controlling a refrigerating device of a water dispenser. The method includes: S1, controlling a refrigerating module to cool water in a cold water tank; S2, when the temperature of the water in the cold water tank is reduced to a first preset temperature, stopping the refrigerating module at the first preset time; S3, controlling the refrigerating module to work again to continue cooling the water in the cold water tank; S4, when the temperature of the water in the cold water tank is reduced to an nth preset temperature, stopping the refrigerating module at the nth preset time; and S5, determining whether the temperature of the water in the cold water tank reaches a target temperature, and if not, repeating steps S3 and S4 after reaching a predefined number. Through multi-stage refrigeration, an ultra-low temperature refrigeration is achieved.

Abstract: A method for controlling a refrigerating device of a water dispenser. The method includes: S1, controlling a refrigerating module to cool water in a cold water tank; S2, when the temperature of the water in the cold water tank is reduced to a first preset temperature, stopping the refrigerating module at the first preset time; S3, controlling the refrigerating module to work again to continue cooling the water in the cold water tank; S4, when the temperature of the water in the cold water tank is reduced to an nth preset temperature, stopping the refrigerating module at the nth preset time; and S5, determining whether the temperature of the water in the cold water tank reaches a target temperature, and if not, repeating steps S3 and S4 after reaching a predefined number. Through multi-stage refrigeration, an ultra-low temperature refrigeration is achieved.