KR940004265A - Microwave Weight Detection Device - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weight detection apparatus for a microwave oven, and a conventional weight detection apparatus for a microwave oven, which is generally used, provides a support roller for supporting a turntable to rotate a bottom of a heating chamber in a heating chamber, and rotating the support roller. By placing a piezoelectric conversion element in the roller rotational track of the bottom surface of the heating chamber that generates stress by detecting the voltage caused by the piezoelectric conversion element when the support roller rotates, and by the weight of the heated object obtained on the turntable It is designed to detect weight.

However, such a device is nonlinear because the output voltage of the piezoelectric element according to the amount of impact on the piezoelectric element, i.e., the weight of the heated object, cannot be accurately measured, and it is easy to produce a piezoelectric element in which the output voltage responds linearly to the impact amount. You do not have a problem.

Accordingly, the present invention solves the deficiency according to the conventional weight detection apparatus of the conventional microwave oven, and by using a ferroelectric as the weight sensing device to change the capacitance change in accordance with the weight of the heated object linearly accurate weight An object of the present invention is to provide a weight detection apparatus of a microwave oven capable of measuring.

Description

Microwave Weight Detection Device

Since this is an open matter, no full text was included.

1 is a configuration diagram of a weight detection apparatus for a microwave oven according to the present invention;

2 is a side cross-sectional view of a main portion of a microwave oven to which the capacitive converter of the present invention is attached

Degree,

3 is a side cross-sectional view of the capacitive converting element,

4 (a) is a configuration diagram of the roller and the capacitance conversion element, Figure 4 (b) is a roller passing

Figure 4 shows the change in capacitance and the relationship between the change in capacitance and weight

Degree.

Claims (2)

A capacitance converting element 7 whose capacitance varies depending on the weight of the heated object disposed on the bottom surface of the heating chamber 2 on the locus of the rotary roller 16, and a capacitance from the capacitance converting element 7 And a weighing device for inputting an output voltage of the capacitance detection unit 30 and measuring the weight of the object to be heated therefrom. Range weighing device. The weight measuring device of claim 1, wherein the weighing device includes: a capacitance detector 30 for measuring a voltage according to a change in capacitance of the capacitance conversion element, and a high pass filter 31 for detecting a high frequency component from a voltage according to the change in capacitance. A detector 32 for detecting the output of the high-pass filter 31 to obtain a corresponding DC component, an amplifier 33 for amplifying the output signal of the detector 32, and the amplifier 33 The peak hold section 34 holding the peak voltage in the output signal of the input signal and the output data of the peak hold section 34 are inputted to determine the omission of the object to be heated according to a pre-stored program from the data, and to control the external circuit frame. Microwave oven measurement device, characterized in that consisting of a microcomputer (36). ※ Note: The disclosure is based on the initial application.