toaster

Abstract

The invention provides a toaster, which includes a heating device and a control circuit. The control circuit includes: a main current circuit of the heating device, a timing control circuit and a relay control circuit. When the timing time for the toaster to bake bread arrives, If the first metal dome switch and the second metal dome switch cannot be disconnected due to external force jamming, the control signal output by the timing control circuit controls the relay control circuit, and the coil of the relay in the relay control circuit is energized, and the series connection The normally closed contact of the first relay and the normally closed contact of the second relay in the main current circuit of the heating device are kept disconnected, and the connection between the heating wire and the zero and live wires of the AC power supply is cut off. The toaster of the present invention eliminates the hidden danger of fire accidents caused when the lifting mechanism of the bread rack is stuck and prolongs the service life of the product under the premise of ensuring that the original functions of the toaster remain unchanged.

Description

technical field [0001] The invention relates to the technical field of bread toaster products, in particular to a toaster with a protection device that can automatically cut off the power when the lifting mechanism of the bread rack is stuck. Background technique [0002] The traditional toaster has such an action principle: the two ends of the heating wire are only connected to the zero live line of the alternating current through a pair of metal shrapnel switches SW1 and SW2, and the operator (user) turns the internal belt through a pressure rod (that is, the handle). The bread shelf lifting mechanism of the spring is pressed down, and the metal shrapnel switches SW1 and SW2 are closed during the pressing process, so that the heating wire is connected with the L line (live line) and the N line (neutral line) to obtain heating power, and the control circuit The required DC +12V and +5V voltages are obtained by taking out about 10V AC power from a middle tap on the heating w...

AI Technical Summary

Problems solved by technology

[0003] Such an action mechanism and principle of the above-mentioned toaster is usually simple and effective, and is also widely used, but there is a safety hazard, that is, if the bread rack lifting mechanism fails after the toaster starts to work (such as being caught by a foreign object stuck or the spring force fails), then when the time is up, the coil of the electromagnet will no longer generate electromagnetic force, the lifting mechanism of the bread rack cannot be loaded, the metal shrapnel switches SW1 and SW2 cannot be effectively disconnected, the heating wire and The connection of the live wire and the neutral wire cannot be cut off, which will cause a very serious fire accident

In order to avoid the above safety hazards, there are currently some solutions through circuit design and related patents, such as patent application number: 201110454049.0, publication number: CN102525293A, title: Chinese patent for a toaster with safety protection function The application announced a solution to prevent jamming from the circuit design, but the circuit disclosed in the patent also has some defects, which will cause the machine to be burned due to overload of a certain component, resulting in the hidden danger of the machine being damaged. Specific analysis as follows:

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