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Impulse current prevented circuit of microwave oven

A technology of inrush current and microwave ovens, which is applied in induction heating, induction heating control, induction heating devices, etc., can solve problems such as noise, and achieve the effects of improving system functions, ensuring safety, and eliminating noise

Inactive Publication Date: 2005-12-07
LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At this time, noise will be generated due to the instantaneous operation of the cutter

Method used

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  • Impulse current prevented circuit of microwave oven
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Embodiment Construction

[0026] Hereinafter, the inrush current prevention circuit of the microwave oven of the present invention will be described in detail with reference to the drawings.

[0027] Such as figure 2 As shown, in a microwave oven with various loads such as a lighting lamp, a fan motor, and a turntable motor, the circuit for preventing inrush current of the microwave oven consists of a microprocessor, a first transistor (Q11), a first relay (RY11), and a Zener diode (ZD11), a second transistor (Q12), and a second relay (RY12). The microprocessor outputs the power drive signal and the main drive signal according to the cooking command of the operator; the first transistor (Q11) turns on / off with the power drive signal of the microprocessor; the first relay (RY11) follows the first transistor (Q11) ) To switch on / off, so that various loads can obtain the necessary power supply from the outside; the Zener diode (ZD11) maintains a constant voltage level, so that the switching action of the firs...

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PUM

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Abstract

A circuit for preventing impulse current in microwave oven, which contains microprocessor for outputting power driving signal and main driving signal, first transistor, first relay, voltage stabilizing diode, said invention can switch on / off relay in minimum current to prevent the impulse current without use of switch breaker etc component, so eliminating the noise due to the use of breaker and raising the system performance.

Description

Technical field [0001] The present invention relates to a microwave oven, and more particularly, to an inrush current prevention circuit of a microwave oven that can prevent an inrush current from being generated in various loads of the microwave oven. Background technique [0002] Recently, various households use gas stoves, gas grills, microwave ovens, electric ovens, etc. as cooking tools. [0003] A microwave oven equipped with a high-voltage transformer and a magnetron uses microwaves generated by the oscillation of the magnetron to heat the food inside the cooking chamber. Among them, the high-voltage transformer generates a predetermined high voltage to start the magnetron. The magnetron radiates high-frequency (approximately 2450MHz) microwaves to the sealed space where the food is placed. Under the action of the radiated microwaves, the water molecules contained in the food will vibrate, and at the same time, the molecular friction generated by the vibration of the water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H05B6/06
Inventor 石虎载
Owner LG ELECTRONICS (TIANJIN) APPLIANCES CO LTD
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