JPH01315982A - Microwave oven with heater - Google Patents

Abstract

PURPOSE:To confirm a baking-up time by installing a microcomputer having a specific function to calculate a baking-up time corresponding to the respective temperatures from a temperature at a starting time to a highest temperature and to indicate the baking-up time. CONSTITUTION:When, for example, bread 7 is put in an oven 6 and a door is closed, an oven door switch 8 is on, a heater 9 works according to a command of a microcomputer 13 to start baking. Outputs of a substrate temperature sensor 12 and the switch 8 are input in the microcomputer 13 to control the heater 9, a fan 10 and a display means 14. When baking is started, a temperature in the oven 6 increases according to a temperature up primary coefficient until the maximum temperature. Next, the fan 10 works and the sensor 12 holds the maximum temperature. When a baking time ends, the heater 9 is off, a temperature in the oven 6 decreases according to a temperature drop primary coefficient when the door is closed or opened, and the baking ends. At the starting time of baking, the microcomputer 13 calculates a finishing time of baking from the temperature up or drop primary coefficient, and indicates it on the display means 14 so that a baking-up time can be confirmed, and it becomes much easier to bake bread.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) P The present invention relates to a microwave oven with a heater that has a function of baking bread in the oven.

(Prior Art) A schematic diagram of an electric circuit of a conventional microwave oven with a heater for baking bread will be explained with reference to FIG.

When switch 1 is turned on, relay 2 is turned on and heater 3 is turned on.
turns on. At the same time, the capacitor 4 is charged, and after a certain period of time, no current flows through the transistor, and the heater 3 is turned off via the relay 2.

Bread baking can be controlled by matching the above fixed bread baking time. Note that explanations other than the above will be omitted.

(Problem to be solved by the invention) When baking toast in a microwave oven with a heater configured as described above,
If bread is put in when the heater 3 is energized, there will be a difference in bread baking time, and the automatic bread baking function cannot be fully implemented.

Furthermore, if there is a leakage current in the capacitor 4, the bread baking time will be inaccurate. Therefore, the bread baking time is uncertain and inconvenient.

3 P (Means for solving the problem) A heater, a substrate temperature sensor, a fan, an oven door switch, and a display means, including a heater and a fan.

The apparatus is equipped with a microcomputer that controls the display means, and the display means displays the bread baking time at the start of bread baking via the microcomputer.

(Function) The temperature inside the oven at the start of bread baking increases from T1 to the maximum temperature T.
If the temperature is between 3 and 3, the microcomputer calculates the bread baking time corresponding to each temperature based on the temperature rise coefficient, the high temperature of the oven inner shell by controlling the fan and heater, and the temperature drop coefficient according to the door condition. Calculate and display on display means.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. 6
is the oven, 7 is the bread, 8 is the oven door switch, 9
10 is a heater, 10 is a fan, 11 is a board, 12 is a board temperature sensor, 13 is a microcomputer, and 14 is a display means consisting of a display tube. The microcomputer 13 receives input from a board temperature sensor 12 and an oven door switch 8, and 9. Heater according to the program with functions. The fan 10 and the display means 14 are controlled. These configurations are appropriately selected and implemented from conventional techniques.

Furthermore, the explanation of the high-frequency heating means in the microwave oven will be omitted.

The effect will be explained below. When bread 7 is placed in oven 6 and the door is closed, oven door switch 8 is turned on, heater 9 is turned on by a command from microcomputer 130, and bread baking begins. The temperature inside the oven rises from the room temperature of 20'CT'l according to the temperature rise coefficient Pt, and reaches the maximum temperature of 250
'Reaching CT3. At the same time, the fan 10 is operated so that the substrate temperature sensor 12 maintains T3. When the bread baking time t1 ends, the microcomputer 13 turns on the heater 9.
Turn off.

The temperature inside the oven decreases according to the descending coefficient Qt+ when the door is closed. Here, the temperature inside the oven is, for example, 22oC.
When I started baking the next batch of bread at 1.22.

The temperature rises in the same way as above, and the microcomputer 13 determines the bread baking time t3 as the temperature rise coefficient Pt and the maximum oven temperature T3.
The bread baking time t3 is calculated and displayed on the indicator P stage 14, and the heater 9 is turned off at the end of the same time.

Next, when the door is opened, the temperature inside the oven is 120, for example.
'CT2 is in the state, and when firing starts at this time, the microcomputer 13 inputs the same T2 and sets the firing time t2ft.
It is calculated and displayed on the second display means 14, and the heater 9 is turned off at the end of the same time.

Incidentally, the temperature inside the oven T1 to the maximum temperature T3 are not limited to the examples, and the bread baking times 11 to t3 are based on those determined from experimental values.

(Effects of the Invention) As described above, according to the present invention, an automatic bread baking function can be completely implemented by providing a conventional device and a microcomputer with a specific function.

It is convenient to be able to check the baking time on the display.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the configuration of a microwave oven with a heater according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of its operation, and FIG. 3 is a conventional electrical wiring diagram of the microwave oven. 8・°Oven door switch, 9...Heater, 10・
...Fan, 12 board temperature sensor, 13 ° microcomputer. P14--Display means, Tl-T3 Oven temperature. 11 ~ t3・Bread baking time, PL・Temperature rise-order coefficient, Qt,・・Oven temperature drop first order coefficient when the door is closed after bread baking is finished, Qt2・Oven temperature drop first order when the door is opened coefficient.

Claims (1)

[Claims] Heater (9), board temperature sensor (12) and fan (10)
), an oven door switch (8), and a display means (14), which input the substrate temperature sensor (12) and oven door switch (8), a heater (9), a fan (10), and a display means (14). Equipped with a microcomputer (13) that controls the
Each bread baking time (t_1) - (corresponding to the temperature inside the oven at the start of bread baking (T_1) to the maximum temperature (T_3)
t_3) by the oven internal temperature rise coefficient (Pt) and the fan (10) and heater (9) by the substrate temperature sensor (12).
) from the maximum temperature inside the oven (T_3) obtained by controlling the oven, the first-order coefficient of temperature drop inside the oven when the door is closed after bread baking (Qt_1), and the first-order coefficient of temperature drop inside the oven when the door is opened (Qt_2). The microcomputer (13) calculates each bread baking time (t_1) to (t_
3) is displayed on a display means (14).