Toaster

Abstract

The invention provides a toaster. The toaster comprises a heating device and a control circuit. The control circuit comprises a heating device main current loop, a timing control circuit and a relay control circuit; when the timing time of the toaster for toasting a bread is reached, if a first metal dome sheet and a second metal dome sheet cannot be switched off due to locking caused by external force, the relay control circuit is controlled by a control signal output by the timing control circuit, a coil of a relay in the relay control circuit is powered to move, a normally-closed contact of a first relay and a normally-closed contact of a second relay serially connected in a main current loop of the heating device are kept in an off state, and the connection between a heating coil and an AC (Alternating Current) power supply null wire and a live wire is cut off. Under the precondition that the primary functions of the toaster are kept constant, the hidden danger of causing fire accidents because a hoisting appliance of a toast rack is blocked can be eliminated, and the service life of the product can be prolonged.

Description

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

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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