Electric water heater leakage detection system and electric water heater

Abstract

The invention discloses a leakage detection system for an electric water heater, which includes a leakage detection circuit connected between the ground wire of the power connector and the wall; it is characterized in that the leakage detection circuit is connected with the main controller of the electric water heater through a photocoupler, so that The ground wire leakage detection circuit of the input terminal of the photocoupler, the output terminal of the photocoupler is connected to the main controller; the main controller detects whether the photocoupler has a high level output > 3 seconds, If so, disconnect the relay controlling the electric heater; after the relay is disconnected, the main controller continues to detect whether the optocoupler has a high level output > 1 second, and if so, it is judged as the environmental ground Charged, if not, it is judged that the electric water heater itself is leaking. The invention also discloses an electric water heater.

Description

technical field [0001] The invention relates to the technical field of electric water heaters, in particular to an electric water heater leakage detection system and the electric water heater. Background technique [0002] An electric water heater refers to a water heater that uses electricity as energy for heating. During use, because the water flowing in the water heater is in direct contact with the human body, once the electricity leaks, the current passing through the water will pass through the human body, causing the human body to endanger life due to the leakage. Although the electric water heater itself is equipped with insulation protection, when the insulation is damaged due to aging or other reasons, the water heater also has the risk of leakage. [0003] At present, the leakage protection method of electric water heaters mostly adopts the method of water resistance (anti-electric wall) for protection against electric shock, and uses the live indicator light of t...

AI Technical Summary

Problems solved by technology

However, the grounding system of China's household power grid generally has a lack of ground wire or a virtual connection of the ground wire. The leakage of electric water heaters can be divided into two types: water heater insulation failure and reverse charging of the ground wire. This technology cannot distinguish whether it is caused by environmental electrification or the electric water heater itself. Caused by electric leakage, bad experience

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