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|1. (WO2018221084) CIRCUIT AND METHOD FOR ULTRAVIOLET LED DISCONNECTION DETECTION, WATER SAMPLING DISPENSER, AND PURE WATER PRODUCTION DEVICE|
|Title:||CIRCUIT AND METHOD FOR ULTRAVIOLET LED DISCONNECTION DETECTION, WATER SAMPLING DISPENSER, AND PURE WATER PRODUCTION DEVICE|
A disconnection detection circuit that detects disconnection of an ultraviolet LED and has: a constant current power source that connects to an anode and cathode in the ultraviolet LED and supplies DC power to the ultraviolet LED; and a relay having an input unit connected in parallel between the anode and the cathode. The relay is operated by increase in voltage between the anode and the cathode, caused by disconnection of the ultraviolet LED, and the disconnection is detected.