Safety control method of photovoltaic water heater and photovoltaic water heater
By adding a DC leakage current protector and differential current detection to the photovoltaic water heater, the current difference is monitored in real time and the power is cut off when leakage is detected. This solves the problem of water electrolysis caused by aging or insulation failure of the DC heating tube, and improves the safety and stability of the photovoltaic water heater.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- QINGDAO HAIER WISDOM ELECTRICAL EQUIP CO LTD
- Filing Date
- 2026-03-02
- Publication Date
- 2026-07-17
AI Technical Summary
When the DC heating element of a photovoltaic water heater ages or its insulation fails, it may cause current leakage, forming a DC current path, triggering an electrolysis reaction of water, leading to hydrogen accumulation and an explosion. Current technology has failed to effectively identify and cut off the power supply.
By adding a DC leakage current protector and differential current detection to the photovoltaic water heater, leakage events can be quickly identified and the DC heating circuit can be cut off by monitoring the current difference in real time. Combined with the bipolar disconnection mechanism when the AC power is cut off, safety can be ensured.
It enables accurate identification and rapid disconnection of DC leakage current, avoids water electrolysis reaction, improves the operational safety and equipment integrity of photovoltaic water heaters, and reduces the risk of malfunction.
Smart Images
Figure CN122408253A_ABST