Oven dynamic distribution power current overload protection and temperature overtemperature protection device

Abstract

The invention relates to the field of ovens, and particularly discloses an oven dynamic distribution power current overload protection and temperature overtemperature protection device. The device comprises a single-chip microcomputer, a PWM drive circuit, a relay, a current detection circuit and silicon controlled rectifier control circuits which are connected in sequence, the single-chip microcomputer is further connected with the silicon controlled rectifier control circuits, a normally open contact of the relay is connected with a live wire, the silicon controlled rectifier control circuits are provided with four silicon controlled rectifier outputs, and the back of the four silicon controlled rectifier outputs is connected with a null line. The total current of three groups of heating wires can be dynamically monitored, the single-chip microcomputer converts the success rate, and the single-chip microcomputer controls the conduction angles of the three groups of silicon controlled rectifier control circuits 6 according to the magnitude of the total working current, so that the magnitude of the output power of the three groups of heating wires is adjusted, the three groups of heating wires work simultaneously, the 3D heating effect is achieved, and the maximum bearing current of a socket is not exceeded.

Description

technical field [0001] The invention relates to a protection device, in particular to an oven dynamic distribution power current overload protection and temperature overtemperature protection device, which belongs to the field of ovens. Background technique [0002] At present, the known oven generally has three groups of heating wires, each group of heating wires has a rated power of 1500W and a current of 1500 / 220=6.8A, controlled by three groups of relays or three groups of thyristors, and the three groups of heating wires can only be divided into It is impossible to make three sets of heating wires work at the same time to achieve 3D heating effect. Now the universal sockets used in households are all 15A / 250V sockets. If the current of three sets of heating wires working at the same time is 6.8*3=20.4A, it is already Exceeded the maximum capacity of the socket. The present invention adopts AC mutual inductance technology, which can dynamically monitor the total current...

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Problems solved by technology

[0002] At present, the known oven generally has three groups of heating wires, each group of heating wires has a rated power of 1500W and a current of 1500 / 220=6.8A, controlled by three groups of relays or three groups of thyristors, and the three groups of heating wires can only be divided into It is impossible to make three sets of heating wires work at the same time to achieve 3D heating effect. Now the universal sockets used in households are all 15A / 250V sockets. If the current of three sets of heating wires working at the same time is 6.8*3=20.4A, it is already Exceeding the maximum bearing capacity of the socket

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