Domestic appliance comprising a protected programming device
AssigneeU.S. Philips Corporation
InventorAndries van der Meulen
Life of this patent
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Abstract
A domestic appliance comprises a programming device receiving on-time information and for updating, by way of repetitious signals, the on-time yet to be completed. The repetitious signals continuously activate an activation signal which is independently terminated if the repetitious signals do not appear. When the activation signal is present, first and second switching components are activated so that a discharge tube can emit ultraviolet radiation. A detection element detects whether the first and second switching components are deactivated outside the on-time. If one of the two switching components remains active outside the on-time, the detection element supplies a signal to inhibit the next start signal.
Claims9
A domestic appliance comprising, a power supply terminal, a generator tube for generating electromagnetic radiation, first switching means connected in series with the generator tube to said supply terminal, and a programming device which comprises an input for receiving on-time information and a subsequent start signal, an output for supplying an activation signal for the first switching means, updating means for updating the on-time yet to be completed, and first detection means for detecting said updating and for generating, in the case of a failure therein, an error signal in order to deactivate said activation signal, and wherein said updating means comprise a signal output for supplying a periodic signal during said on-time for continuous reactivation of said activation signal, the activation signal disappearing if said periodic signal does not appear.
Dependencies are inferred from the claim text.