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Overcurrent protection circuit for microwave oven

A technology for protecting circuits and overcurrents. It is used in household stoves/stoves, electric heating fuels, and household heating. It can solve problems such as easy damage to products, poor safety of microwave ovens, and electric shocks.

Inactive Publication Date: 2003-07-09
LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the heat energy dissipated by the heater can melt the surrounding plastic parts and wire coating, resulting in electric leakage and electric shock to the human body
Moreover, the above-mentioned temperature control switch cuts off the power supply after the internal components are damaged. Therefore, the traditional microwave oven has the problems of poor safety and fragile products.

Method used

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  • Overcurrent protection circuit for microwave oven
  • Overcurrent protection circuit for microwave oven
  • Overcurrent protection circuit for microwave oven

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Embodiment Construction

[0024] Fig. 2 is a driving circuit diagram of a microwave oven heater of the present invention. Prevents overcurrent from flowing when the heater operates abnormally.

[0025] As shown in the figure, the present invention is connected to various devices through power lines (12a, 12b, 12c). The power cord (12c) is grounded. Through the power cord (12a), there is a fuse (1) connected. The fuse (1) is connected in series with the temperature control switch (2). In the present invention, the above-mentioned temperature control switch (2) uses a temperature automatic regulator, which is used to check and control the temperature when the heater is driven for oven cooking.

[0026] Above-mentioned temperature control switch (2) is connected with furnace door switch (3). The above-mentioned furnace door switch (3) plays the role of cutting off the power according to the opening and closing of the microwave oven door (not shown). In other words, when the heater operates abnormally...

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Abstract

The present invention relates to an overcurrent protection circuit of microwave over heater. It is formed from several heaters, relays and safety fuse. All the heaters are mutually parallelly-connected, and all the relays are respectively series-connected with all the heaters, and the safety fuse is series-connected in the shared load wire of all the heaters and relays. Wher the heater has overcurrent, the safety fuse can promptly cut off power supply of heater so as to can prevent element and device of working circuit of ehater from damaging.

Description

technical field [0001] The invention relates to an overcurrent protection circuit of a microwave oven, in particular to an overcurrent protection circuit which cuts off the power supply of a microwave oven heater by using a fuse. 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 both utilize microwaves to complete the cooking process, and can also utilize heaters to complete the cooking process, or utilize both microwaves and heaters to complete the cooking process. The conventional microwave oven heater driving circuit will be described below. [0003] Figure 1 shows the circuit that cuts off the current when the heater operates abnormally in the conventional mi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F24C7/08
Inventor 姜大龙
Owner LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD
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