JPH0135255B2 - - Google Patents

Description

A time converter 17 that calculates the time t2 t2=(n+m・a)t1, and a first time t1 in response to the output of the time converter 17.
A cooking appliance characterized in that it comprises means 3, 5, 6, 18 for continuously energizing the high frequency generating means 1 for a second time t2 after the elapse of time.

[Detailed description of the invention]

TECHNICAL FIELD The present invention relates to a cooking device such as a microwave oven that heats food by high frequency induction, and more particularly relates to a cooking device that automatically finishes and cooks food. Conventionally, in such cookers, a predetermined time, for example, one minute, is added or subtracted from the standard automatic cooking time so that the finished state can be manually corrected. . With such prior art, the automatic cooking time is 10
If the cooking time is 30 minutes, the correction time of 1 minute will change the finished state, but if the cooking time is 30 minutes, for example, the correction time of 1 minute will have only a slight change in the finished state. Further, if the cooking time is 1 minute, this 1 minute correction time is meaningless. An object of the present invention is to provide a cooking device that can appropriately correct cooking time. The present invention provides a cooking device that dielectrically heats a food to be cooked in a heating chamber by a high frequency generating means 1, which includes: a gas concentration detector 2 for detecting the concentration of gas generated from the food to be cooked; A finish detector 9 that discriminates the level of the output at a predetermined discrimination level; and In response to the output of the finish detector 9, the output of the gas concentration detector 2 detects the finish from the start of power energization of the high frequency generating means 1. a time detector 10 that measures and detects the first time t1 until reaching the discrimination level set by the detector 9; a weak correction key 12; a strong correction key 13; a weak correction key 12 and a strong correction key. A counter 15 counts the number of times m of operations with 13, n and a are predetermined constants, m is negative when the weak correction key 12 is operated, and m is positive when the strong correction key 13 is operated. When doing, the second
A time converter 17 that calculates the time t2 t2=(n+m・a)t1, and a first time t1 in response to the output of the time converter 17.
The cooking appliance is characterized in that it includes means 3, 5, 6, and 18 for continuously energizing the high-frequency generating means 1 for a second time t2 after the elapse of time. The drawing is a block diagram of an electric circuit according to an embodiment of the present invention. A magnetron 1 is provided in a heating chamber in which food to be cooked in the microwave oven is stored. The high frequency waves from the magnetron 1 heat the food to be cooked by high frequency dielectric heating. A detector 2 detects the concentration of gas generated from the dielectrically heated food. Associated with the magnetron 1 is a transformer 3 for generating high voltage. A semiconductor switching element 6 such as a triax having a control terminal 5 is interposed between the primary side of the transformer 3 and a commercial AC power source 4 . By changing the conduction angle of this semiconductor switching element 6, the duty of the magnetron 1 is controlled. The control circuit 7 includes a power supply circuit 8 that converts power from the commercial AC power supply 4 into DC power, and operates using this DC power. In the control circuit 7, the output from the detector 2 is received by the finish detector 9. The finish detector 9 performs level discrimination on the signal from the detector 2 using a predetermined discrimination level. The time detector 10 measures and detects the time t1 from the start of power energization of the magnetron 1 until the output of the detector 2 reaches the discrimination level set by the finish detector 9. When time t1 has elapsed from the start of power energization of magnetron 1, magnetron 1
continues to be powered for an additional standard additional heat time or its corrected time. This standard additional heat time is represented by the product n·t1 of a predetermined additional heat constant n and the time t1. Automatic cooking is performed by continuously energizing the magnetron 1 for this standard additional heat time n·t1 or a corrected time. The keyboard 11 has the standard additional heat time nt described above.
Correction keys 12 and 13 for correcting 1 are included. Signals from the keyboard 11 are applied to a key input reading circuit 14 and encoded. The coded signal is provided to a counter 15. A counter 15 counts the number of times the correction keys 12 and 13 have been pressed, and this count value is stored in a memory 16 and given to a time converter 17. The time converter 17 calculates the time t2 expressed by the first equation.
Calculate. t2=n*t1+m*a*t1=(1+m*a)t1...(1) Here, m is a positive or negative integer obtained from the counter 15, or a numerical value of zero. Correction key 13
"Strong" is displayed, and this correction key 1
When 3 is pressed, the counter 15 counts a positive value m, which is the same value as the number of times the button was pressed. Further, the correction key 12 is displayed with "weak", and by pressing the correction key 12, the counter 15 receives a negative integer m whose absolute value is the number of times the correction key 12 is operated. is counted. When the correction keys 12 and 13 are not operated, m=0. In the first equation, a is a predetermined positive correction constant. The drive circuit 18 responds to the output from the time converter 17, and after a time t1 has elapsed since the magnetron 1 started being powered, the drive circuit 18 is further powered for a time t2 shown by the first equation. , gives a gate signal for duty control to the control terminal 5 of the semiconductor switching device 6. When time t2 elapses during cooking, the drive circuit 18 responds to the output from the time converter 17 and keeps the semiconductor switching element 6 cut off. In this way, a positive or negative value m is input from the keyboard 11 depending on the number of operations of the correction keys 12 and 13, and this value m is added to the standard additional heat time n·t1.
is multiplied by the time t1 associated with the time m・a・t
1 is calculated. Time t2 obtained by adding this product m・a・t1 and standard additional heat time n・t1
Since the power energization of the magnetron 1 is continued for the same amount of time, it is possible to appropriately correct the standard additional thermal time n·t1 regardless of the length of the standard additional thermal time n·t1. In addition, this correction can be made by pressing the correction key while checking the finished state of the food while the magnetron 1 is cooking the food by dielectric heating.
2 and 13, it is possible to obtain the desired finished state. Also, counter 15
The counted value is stored in the memory 16, and the stored contents are given to the time converter 17, so that similar corrections can be made when cooking multiple times. In the illustrated embodiment, the control circuit 7 is realized by a plurality of individual circuits, but such a control circuit 7 may be realized by a processing circuit such as a microcomputer that executes a program. As described above, according to the present invention, the output of the gas concentration detector 2 is determined by measuring the first time t1 until reaching the discrimination level set by the finish detector 9 with the time detector 10. In order to calculate the standard additional heat time n·t1 based on the first time t1 and to correct the standard additional heat time, a weak correction key 12 and a strong correction key 13 are provided. The number m of operations of both correction keys 12 and 13 is counted by the counter 15, and the weak correction key 1 is
2 is operated, m is set as negative, and when strong correction key 13 is operated, m is set as positive, and m.
a・t1 is calculated, and thereby the second time t2
(=nt・1+m・a・t1), so that the high frequency generation means 1 is continuously energized with power, so that regardless of the length of the standard additional heat time n・t1, the first time t
It is possible to perform a desired and effective correction of the finished state of the food item corresponding to item 1. Moreover, according to the present invention, the degree of correction of the standard additional heat time can be adjusted according to the number of times the weak correction key 12 and the strong correction key 13 are operated, resulting in good operability.

[Brief explanation of drawings]

The drawing is a block diagram of an electric circuit according to an embodiment of the present invention. 1... Magnetron, 2... Detector, 4... Commercial AC power supply, 6... Semiconductor switching element, 7
... Control circuit, 9 ... Finishing detector, 10 ... Time detector, 11 ... Keyboard, 12, 13 ...
Correction key, 14...Key input reading circuit, 15...
...Counter, 16...Memory, 17...Time converter, 18...Drive circuit.

Claims (1)

[Scope of Claims] 1. A cooking device that dielectrically heats a food to be cooked in a heating chamber by a high frequency generating means 1, comprising: a gas concentration detector 2 for detecting the concentration of gas generated from the food to be cooked; and a gas concentration detector. A finish detector 9 discriminates the output of the detector 2 at a predetermined discrimination level; and in response to the output of the finish detector 9, the output of the gas concentration detector 2 is adjusted from the start of power energization of the high frequency generating means 1. a time detector 10 that measures and detects a first time t1 until the finish reaches the discrimination level set by the finish detector 9; a weak correction key 12; a strong correction key 13; and a weak correction key 12. A counter 15 counts the number of times m of operation with the strong correction key 13, n and a are predetermined constants, m is negative when the weak correction key 12 is operated, and m is negative when the strong correction key 13 is operated. is positive, then the second