KR940011869A - Absolute Humidity Detection Device of Microwave Oven - Google Patents

Abstract

The present invention relates to a device for detecting absolute humidity of a microwave oven. In the related art, regardless of water vapor generated from food in a microwave heating chamber, a heat source of a heater is transmitted to the inside of a sensor, and the thermistor resistance inside the sensor changes, thereby preventing food from being fed. In the case of a microwave oven equipped with a humidity sensor, it is necessary to have a structure to deteriorate the cooking performance by inducing the adverse effect of premature sensing, and to ensure the thermal stability of the sensor itself. There was a problem of rising costs.

Therefore, in order to solve the conventional problems, the present invention provides a sensor output in a state in which the temperature inside the sensor is set to an environmental condition similar to the oven / grill auto-cooking state (about 350 ° C.) at the same time as the oven / grill auto-cooking of the microwave oven is started. If the sensor output reaches the initial sensing point set in the program while the heater heating is continued after the detection, the final sensing point is obtained by using the sensor output and the initial sensing point during the current conversion. By improving the auto cooking performance, it is more effective in cost reduction.

Description

Absolute Humidity Detection Device of Microwave Oven

As this is a public information case, the full text was not included.

1 is a longitudinal sectional view of a microwave oven equipped with a humidity sensor,

4 is a circuit diagram of a device for detecting absolute humidity of the microwave oven according to the present invention;

5 is a humidity sensing output vs. time characteristic diagram for setting the final food sensing point in the oven and grill cooking of the present invention,

Figure 6 is a flow chart of the automatic cooking operation related to the final food sensing point setting of the present invention.

Claims (3)

Sensor inflow current adjusting means for adjusting the temperature of the absolute humidity sensor (5) to suit the oven / grill environment of the oven in the microwave oven / grill cooking. An output voltage detecting means for operating the sensor inflow control adjusting means to detect an output voltage change ΔV ₁ when the current increases in the absolute humidity sensor 5 and to store the value in the microcomputer 8; Initial sensing point determination means for determining whether the output of the absolute humidity sensor 5 reaches a preset initial sensing point voltage ΔV ₂ while performing cooking, and the output sensed by the output voltage sensing means. And a means for calculating a final sensing point using the voltage change ΔV ₁ and the initial sensing point voltage ΔV ₂ . The method of claim 1, wherein the sensor sink current control means and the on / off transistor (Q ₄₎ which by means of the microcomputer (8), the transistor (Q _4), a current that flows into the ON state when the absolute humidity sensor (5) Absolute humidity detection device of a microwave oven, characterized in that it comprises a resistor (R ₁₄ ) to increase. The absolute humidity detection of the microwave oven according to claim 1, wherein the final sensing point calculating means calculates the sum of the sensor output voltages when the current changes (ΔV ₁ ) and the initial sensing point voltage (ΔV ₂ ). Device. ※ Note: The disclosure is based on the initial application.