Microwave starting current dividing circuit for barbecue mechanical type micro-oven

Abstract

The invention relates to a roast mechanical type microwave oven, in particular to a roast mechanical type microwave oven startup distributary circuit, which includes an AC startup relay controlled by a main switch. The controlled end of the relay is controlled to communicate with the high voltage transformer primary level and the power supply zero line, the controlled ends of the relay is respectively connected with two ends of the roast tube. The invention has the benefit effects of realizing the distributary circuit effect through utilizing the heater instead of the parallel connection distributary circuit resistance, not causing burn condition with continuously heating, thereby improving the security of the microwave oven and saving cost.

Description

technical field [0001] The invention relates to a mechanical barbecue microwave oven, in particular to a microwave starting shunt circuit for a barbecue microwave oven. Background technique [0002] Generally speaking, a microwave oven is a device that uses microwaves to heat and cook food. Since the heating of the microwave oven is required to be diverse, in addition to the magnetron for generating microwaves, the microwave oven is also provided with a heater for heating or toasting food at high temperature. Microwave ovens can either use microwaves to complete the cooking process, or use heaters to complete the cooking process, or use microwaves and heaters to complete the cooking process. The conventional microwave oven heater driving circuit will be described below. [0003] Such as figure 1 The schematic diagram of the shunt circuit of the barbecue mechanical microwave oven shown in the prior art, the live wire of the power supply is connected to the primary phase of...

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Problems solved by technology

[0003] like figure 1 The schematic diagram of the shunt circuit of the barbecue mechanical microwave oven shown in the prior art, the live wire of the power supply is connected to the primary phase of the high-voltage transformer through the microwave switch. To the zero line of the power supply, at this time, there is current flowing through the primary of the high-voltage transformer. When the main switch is turned on, the controlled end of the controlled relay is turned on, and the supply current flows through the primary of the high-voltage transformer through the controlled The terminal flows into the neutral line of the power supply. Since the current no longer flows through the shunt resistor after the relay is turned on, objectively the shunt resistor reduces the starting current of the high-voltage transformer primary, so that the current flowing through the high-voltage transformer primary The magnitude of the inrush current is reduced, that is, the starting current is reduced. Therefore, when the microwave oven heater of the traditional technology operates abnormally, the heater drive circuit has the following technical problems. After the heater is driven abnormally, once the relay cannot be closed The parallel shunt resistor will be continuously energized and burned, and even the high heat generated will burn other parts of the microwave oven, such as: melting the surrounding plastic parts and wire coating, resulting in leakage, causing the danger of electric shock to the human body

Therefore, traditional microwave ovens have the problems of poor safety and fragile products.

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