Automatic device for selecting the supply to the heating resistance elements of a baby's bottle dual-current heater

摘要

This device is of the type comprising two independent resistance elements, namely a first resistance element (7) able to be supplied with alternating current from the mains, and a second resistance element (10), able to be supplied with low-voltage direct current. According to the invention, it comprises, in the supply circuit (12) of the second resistance element (10), which circuit is mounted in parallel with the power supply circuit (6) of the first resistance element (7), a switching element (15) in the open state when at rest, and controlled via a Darlington pair arrangement (17-18), itself driven by a transistor (23) associated with a Zener diode (19), mounted in parallel with each other, so that, with a supply of alternating current from the mains, the transistor (23) associated with the Zener diode (19) is saturated and turns off the Darlington pair (17-18) by placing the abovementioned switching element (15) in a state preventing power being supplied to the second resistance element (10). IMAGE