Electric leakage induction and protection control system on electric water heater

Abstract

The invention discloses an electric leakage induction and protection control system on an electric water heater. The electric leakage induction and protection control system on the electric water heater comprises a control module; a water tank filled with water is provided with an electric heating device; a power supply switch is arranged between the electric heating device and a power supply; the water outlet end of the water tank is connected with an electric insulation water tube; and the electric insulation water tube is also provided with a center-penetrating type current mutual inductor detection module and an effluent control valve. The electric leakage induction and protection control system aims to detect the magnitude of leakage current by the center-penetrating type current mutual inductor detection module; when the control module judges that the leakage current exceeds a preset value to cause harm to a user, the power supply switch is controlled to be cut off; after the power supply switch is cut off, the effluent control valve is controlled to cut off the effluent when the electric leakage current is detected to still exceed the preset value so as to prevent the electric leakage current from contacting with a user via water flow; in addition, because the electric insulation water tube is arranged between the water tank and the water outlet end, the leakage current can be prevented from contacting with the user via equipment so as to guarantee the safety of the user.

Description

[technical field] [0001] The invention relates to a leakage induction and protection control system on an electric water heater, which belongs to the field of electricity. [Background technique] [0002] At present, the anti-shock protection control device in the electric water heater for bathing generally adopts the power leakage detection and power-off control device, referred to as the A scheme, and the water body resistance and isolation device, referred to as the B scheme. The sum of the loop current is equal to zero. The principle is based on Kirchhoff’s current law. When there is a leakage fault, a third current branch appears, which causes the sum of the loop current of the original power supply to be non-zero. The system detects this current difference and judges the electrical appliance accordingly. There is leakage, and when the leakage current is greater than the set value, the power supply is cut off through the control circuit to prevent personnel from getting ...

AI Technical Summary

Problems solved by technology

3. In plan B, when the ground line is charged, the leakage protection function may fail

[0006] 4. In plan B, due to the different water quality

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