JPS61110993A - Heating cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a heating cooker, and particularly relates to a heating cooker that enables suitable heating without being affected by fluctuations in power supply voltage. .

(Prior art) Recently, a microcomputer has been incorporated into an open cooking range equipped with a heater and a magnetron.
It is known that the microcomputer is programmed with 11 complicated cooking sequences so that the object to be heated can be cooked in the cooking sequence that is most suitable for each cooking menu. In this case, to program the cooking sequence mentioned above, the cooking means, cooking power, and cooking temperature are required.

This is done by inputting and setting data such as cooking time using key operations.

[Problem that the invention seeks to solve]

However, in the conventional heating cooker, the cooking sequence is set based on the standard when the household commercial power supply voltage is 100V, so if the commercial power supply voltage drops to 90V, the heating power will decrease. On the other hand, if the above commercial power supply voltage is
When the voltage rises to 0V, there is a problem in that excessive heating occurs due to an increase in heating power.

In addition, in such a heating cooker according to the prior art, in order to measure the cooking time, a dedicated reference clock generating means as an input for a clock, timer, etc. is separately required, which inevitably increases the number of parts.

Therefore, an object of the present invention is to enable suitable cooking without being affected by fluctuations in power supply voltage, and to separately provide dedicated reference clock generation means as an input for a clock, timer, etc. in order to measure cooking time. To provide a heating cooker in which the number of parts is reduced without the need for parts.

[Means for solving problems]

The present invention has a power supply voltage measuring means that fluctuates in synchronization with the frequency of the power supply voltage and outputs a signal with an amplitude value corresponding to the magnitude of the power supply voltage, and the amplitude value of the output of the power supply voltage measuring means and a reference value. The heating control is performed based on the calculation result.

[Effect]

In the present invention, heating control is performed based on a signal with an amplitude value corresponding to the magnitude of the power supply voltage.

〔Example〕 Embodiments of the present invention will be described below based on the drawings.

Reference numeral 1 denotes a heating chamber of a cooking device, and a rotary table 2 on which an object to be heated K is placed is provided within the heating chamber 1. here,
In the heating chamber 1, an upper heater 3 and a lower heater 4 for cooking the object to be heated K are connected to a commercial power source S, and
Further, a magnetron 5 is provided near the heating chamber 1 and connected to a commercial power source S, and the microwaves from the magnetron 5 are guided into the heating chamber 1 via a waveguide 6, and are directed to the object to be heated. irradiated with K, and the object to be heated K is heated and cooked.

Reference numeral 7 indicates a relay driver that controls the energization time of the upper and lower heaters 3 and 4 and the magnetron 5.

Further, a thermistor 8 is provided at the exhaust port IA of the heating chamber 1 and serves as a temperature detection element that outputs an analog signal;
indicates an A/D converter that converts the output of the thermistor 8 into A/D.

On the other hand, 10 is a step-down transformer that steps down the voltage of the commercial power supply S, and 11 is a DC conversion circuit that converts the output of the step-down transformer 10 from AC to DC. Here, the DC conversion circuit 11 includes four bridge-connected diodes 12, 12 . - and a smoothing capacitor 14, contacts A and B of the bridge rectifier 13.
are connected to both ends of the power transformer 10, and the contact C
7D is connected to the smoothing capacitor 14.

Therefore, the smoothing capacitor 14 is connected to the step-down transformer 1.
It is charged to a voltage corresponding to the voltage of 0, and therefore,
When the power supply voltage of the commercial power supply S fluctuates, the voltage of the smoothing capacitor 14 also fluctuates accordingly.

Reference numeral 15 designates an NPN (npn) transistor with a common emitter; the collector side of the transistor 15 is connected to one side of the smoothing capacitor 14 via a collector resistor 16, and the emitter side is connected to the other side of the smoothing capacitor 14. Furthermore, a high frequency voltage is supplied from the step-down transformer 10 to the base side via voltage dividing resistors 17' and 1B, and the transistor 15 is turned on and off in synchronization with the high frequency voltage. Therefore, a rectangular voltage ■ synchronized with the high frequency voltage is generated between point E on the collector side of the transistor 15 and point F on the emitter side, and the voltage ■ corresponds to fluctuations in the power supply voltage. It will change. Here, the above voltage ■ is set so that it shows -15V when the power supply voltage is 100V, shows -14V when the power supply voltage drops to 95V, and shows -16V when the power supply voltage rises to 10V. ing.

A waveform shaping circuit 19 is constituted by the transistor 15, the voltage dividing resistors 17 and 18, and the collector resistor 16. or,
The waveform shaping circuit 19 and the DC conversion circuit 11 constitute a power supply voltage measuring means 20 that fluctuates in synchronization with the frequency of the power supply voltage and outputs a voltage (2) with an amplitude value corresponding to the magnitude of the power supply voltage. . 21 is a microcomputer,
8. The microcomputer 21 has the above transistor 1.
The microcomputer 21 is supplied with the voltage (2) between points E and F of No. 5, so that the microcomputer 21 can detect fluctuations in the amplitude value of the power supply voltage. Here, the microcomputer 21 compares and calculates the power supply voltage with a reference value, and performs sequence control within the heating chamber 1 based on the result of this calculation.The sequence control is performed by operating the keyboard, which will be described later. A cooking sequence in which the optimal cooking means, cooking temperature, and cooking time are stored to execute each cooking menu selected by the key, and a cooking sequence that stores the optimum cooking means, cooking temperature, and cooking time; The heating sequence is executed by the heating sequence that is called by the above-mentioned cooking sequence when the alternate heating cooking means is selected. Here, the heating sequence is performed by controlling the relay driver 7 that adjusts the energization time of each of the heater 3.4 and magnetron 5, and the heating sequence is performed by controlling the output of the A/D converter 9. This is done based on the signal and the voltage fluctuation of the commercial power supply S. In this embodiment, the voltage fluctuation is divided into three stages with reference values of 95V and 105V, and therefore, the heating sequence is divided into the third heating sequence when the voltage is 105V or more. Here, in order for the microcomputer 21 to detect a fluctuation in the power supply voltage of the commercial power supply S, it is necessary to detect a change in the power supply voltage of the commercial power supply S when the voltage V between E and F of the transistor 15 is <-15V as shown in FIG. 2(A). It is determined that the power supply voltage is 100V, and when <-14V as shown in the figure (B), the power supply voltage is determined to be 90V, and further, as shown in the figure (C).
As shown in the figure, when <-16V, it is determined that the power supply voltage is 110V. The microcomputer z1 constitutes a heating control means.

Further, 22 is a keyboard, and the keyboard 22 is provided with various operation keys 23, 23, - corresponding to various cooking menus.

The heating cooker according to the present invention is constructed as described above, and its operation will now be explained based on FIGS. 3 and 4.

First, a cooking menu is selected using the operation keys 23, 23 DEG -. of the keyboard 22, and heating cooking is started by pressing a cooking start key (not shown) on the keyboard 22.

The microcomputer 21 then operates the operation keys 23.
, 23. - The upper and lower heaters 3 and 4 and the magnetron 5 are
It is assumed that the heating cooking method using alternating heating is selected (step Sl). Then, first, in step S2, the voltage of the commercial power supply S is measured, and at this time, if the measured voltage is 100V, which is the standard voltage, the microcomputer 10 measures the voltage of the commercial power supply S in step S3. The first heating sequence is selected via S4 (step S5), and the object to be heated is cooked (step 36).

The cooking state in this case is shown in FIG. 3(A). In the figure, A indicates on/off of heaters 3 and 4, and the mouth indicates magnetron 5.
indicates on or off. However, in this case, the heater 3
, 4 and the magnetron 5 are, for example, 6 to 40 energization time Tl
, T2, so that the heaters 3,
4 burns the surface of the object to be heated, while the magnetron 5 heats the inside to perform heating cooking.

Further, if the voltage of the commercial power supply S drops to less than 95V in step S3, the micro combinator 10 selects the second heating sequence (step S7) and executes cooking of the object to be heated (step S6).

The cooking state in this case is shown in FIG. 3(B). However, in this case, the heaters 3 and 4 and the magnetron 5 are arranged in a ratio of, for example, 2 to 8.
The energization time T3. Apply electricity alternately at a rate of T4, and then
Speed heating using microwaves is performed for a relatively longer time than when the first heating sequence is selected, and as a result, cooking within the same time does not result in insufficient heating.

Further, in step S4, the voltage of the commercial power supply S is 1osv.
If the temperature has increased above that level, the microcomputer 10 selects the third heating sequence (step S8), and executes cooking of the object to be heated (step S6).

The cooking state in this case is shown in FIG. 3(C). However, in this case, the heaters 3 and 4 and the magnetron 5 are arranged in a ratio of, for example, 8 to 2.
The energization time T5. Apply electricity alternately at a rate of T6, and then
Compared to the case where the first heating sequence is selected, the speed of heating by the microwave is reduced to a relatively shorter time,
As a result, even if the food is cooked within the same amount of time, overcooking will not occur.

In this way, even if the voltage of the commercial power source S fluctuates, the object to be heated is not affected by the fluctuation in voltage, and good cooking is performed.

On the other hand, the transistor 1 constituting the power supply voltage measuring means 20
5 is turned on based on the voltage fluctuation of the commercial power supply S.

In order to turn off, the output voltage (2) of the power supply voltage measuring means 20 is synchronized with the voltage of the commercial power supply S as shown in FIG. It is possible to measure cooking time, etc., drive a timer, and determine power frequency 50/6011z.

[Effects] ′ As explained above, according to the present invention, a power supply voltage measuring means is provided which fluctuates in synchronization with the frequency of the power supply voltage and outputs a signal with an amplitude value corresponding to the magnitude of the power supply voltage. ,
Not only can fluctuations in the power supply voltage be detected, and therefore good cooking can be performed in accordance with the fluctuations in the power supply voltage, but also a signal synchronized with the frequency of the power supply voltage can be output as described above. , there is no need for a separate reference clock generation means as an input for a timer, etc., and the number of parts can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall configuration diagram of a heating cooker according to the present invention, FIG. 2 is a time chart, FIG. 3 is a flow chart explaining the operation, and FIG. 4 is a time chart. 20... Power supply voltage measuring means, 21... Heating control means (microcomputer). Agent Masuo Oiwa (and 2 others) Figure 1 20-11 years old 21-m-Micro Koshige User Figure 2 Figure 3 Figure 4 Figure 5 T6

Claims (1)

[Claims] A power supply voltage measuring means that fluctuates in synchronization with the frequency of the power supply voltage and outputs a signal with an amplitude value corresponding to the magnitude of the power supply voltage, and the amplitude value of the output of this power supply voltage measuring means and a reference value are calculated. , and heating control means that executes heating control based on the calculation result.