JPS59192316A - Controller for 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 (a) Field of Industrial Application The present invention relates to a control device for a cooker that is equipped with a heat retention function and the like and is therefore provided with a safety device for a cooker that is at risk of being overheated in an abnormal situation.

(0) Prior art As shown in Figure 1, heat with a heater etc., perform 7 treatments, and then keep warmN! Al 3: + (Since the main power switch is left on in one pot to keep it warm, if a malfunction occurs in the control device, etc., the food to be cooked may be overheated for a long time.) .

For example, Fig. 2 is a circuit diagram of a conventional pressure cooker, in which a timer (TM) such as a timer is set at the start of cooking, and a power switch (1) is controlled in conjunction with the timer (TM) K. When connected, the heater is energized and cooking begins. As the timer (TM) operates, the self-holding contact (3) turns OFF and the timer (TM) operates.
TM) stops operating, but the power switch (1) is set to 0.
It remains N.

In such a device, the element □□□ that controls the energization of the heating heater turns off the large current to 0, so
Durability has been a problem, such as ignition dissipation and thermal runaway, and there is a greater possibility of abnormalities occurring compared to other parts, and when such an abnormality occurs, the power is turned on. Especially if your cooker is a pressure cooker! -1t-i.

Because of this, the pressure increases instead of firing, so although there are safety devices such as pressure valves, overheating of the FI11 for a long time is very dangerous and a waste of power2.And to prevent this, other power switches are installed. If a means is provided, the failure rate becomes a problem because the newly provided switch means handles power.

(c) Object of the Invention The present invention has been made in consideration of the above-mentioned points, and has been made by focusing on the fact that the start of cooking is set by operating the timer.

B) Structure of the Invention The present invention operates the timing means continuously when the temperature of the food to be cooked becomes higher than the normal cooking temperature, and the main switch controlled by the timing means is turned on before the control starts. This leads to a state of disconnection. The present invention will be explained in detail below based on examples.

0→Embodiment Figure 3 is a circuit diagram of a cooking appliance control device according to an embodiment of the present invention. 6 switches (TSl) (Ta
2) (Ta2) is fttlJi. Fig. 4 is a time chart showing the switch control of this timing means (TM). When the cook sets the dial or key switch toward the left on the horizontal axis, from the left "cooking" side to the right rl; 7IJ
A timing operation is performed toward the side. Switch (TSl)
(Ta2) Depending on the connection/disconnection status of (Ta2), "-off",
There are scales (or preset displays) for "keep warm", "cook", etc., but the switch (TSl) controls the energization of the entire control device, and except for "off" (timekeeping O), it can be used at all times. The switch (Ta2) switches between the temperature for keeping warm and the temperature for cooking, and is in the connected state only during the period from "cooking" to "off".
2) is for the timekeeping means (TM) to continue measuring time even if it is not controlled by others, and is in the contact state from ``1 cooking'' to ``keep warm''. The handling of this time measuring means ('TM) will be described later.

In Fig. 3, (4) is a temperature measuring element that detects the temperature of the object to be cooked, such as a pot or pot containing food. (6) and other resistors +6rtef+
A balanced circuit is formed between eri6i't6T and No1-. (7) is a heater that heats the third object mentioned above, and a switch (TSl) controlled by the timing means (TM).
and a control element (8) for temperature control are connected in series. The control element (8) of Katsudako is composed of semiconductor switch elements, relays, etc., but it also includes a comparator and arithmetic amplifier that detect the output of the temperature detection element (4) by a balanced circuit consisting of the temperature detection element (4) and a resistor + eoefter + ef. The energization is controlled by a detector (9) consisting of a cloth or the like and an ignition circuit (8). 00) is a second detector that detects the output of the temperature sensing element (4) by a balanced circuit consisting of the temperature sensing element (4) and a resistor +6) (6) (61), and the output is the OR gate α1) ignition circuit. (It is wired as a control signal for a drive element (13) such as a triac connected in series to the time measuring means (TM) via a signal line 121. The operating temperature of the detector (9) is higher.The switch (Ta2) controlled by the aforementioned timing means (TM) is connected to the resistor (6f) and is used to change the equilibrium condition of the input circuit of the detector (9). , the switch (Ta2) is used to give the "■" level to the OR gate +111.

In the above configuration, cooking is started by setting the timing means (TM), which is in the "off" state, to the "cooking" state, so that the switch (TSl) is turned on, and cooking begins as shown in FIG. 1. In other words, since the temperature of the food to be cooked is initially low, the output of the detector (9) becomes the "■" level and the ignition circuit (8)
is activated, the control element (8) is turned on, the heater is energized, and heating begins. On the other hand, the switch (Ta2) is connected and the switch +111 is at the "H" level, the drive element (13) is turned on, and the timer (TM) starts a timer operation. When the temperature rises and reaches the so-called cooking temperature,
The detector (9) outputs rLJ level and [HJV level depending on the temperature, and the control element (8) operates ON10FF. After a predetermined period of time has elapsed, the timing switch (Ta2) is turned on by the timing means (TM), and the set temperature is lowered, so the detector (9) outputs the "L" level and the food to be cooked is lowered to the keeping temperature. While the detector (9) is working again near the warming set temperature and the control element (8) is operating 0N10FF, the entire cooking time has elapsed and the timing means (TM) turns off the switch ('fB3). become. This allows the or gate (
Since the output of 11) becomes “I・” level, the drive element 03
) is turned OFF, and the time measuring means (TM) stops measuring time. At this time, the switch (TSI) is in the connected state because it is the display time of "1 keep warm" in FIG. 4, and the keep warm temperature control by the detection Mj+(91) is continued.

When serving cooked food, the cook should turn on the timing means (TM).
+t to enter the state.

By the way, if an abnormality occurs in the control element (8) or its drive circuit or the like at any time and the heater (7) remains energized, the temperature will exceed the molding temperature. At this time, the output of the second detector 00) which detects the output of the temperature detection element (4) is "11".
Level Totorukara, Or Gate 01), Sacred Arc Circuit (12)
) to turn on the drive element (13). Therefore, regardless of whether the self-holding switch ('l' S3) is connected or disconnected, the timing means (TM) violates the timing operation, and eventually becomes the ``off'' state shown in Figure 4, and the main city, source switch <
T S 1 ) will be severed.

-)- In the example mentioned above, the timing means (TM, ) changes the timing according to the progress of cooking (by setting the timing means (TM) to start immediately) according to the progress of the cooking. ) with the switch (T81) closed, the clock means (T
In addition to the self-holding switch (T83) that stops the timer (TM), there is also a detector (00) that causes the timer (TM) to operate one time when the temperature sensing element (4) outputs an output above a certain temperature that is higher than the cooking temperature. has been established. However, in cooking, it is preferable to set the cooking time according to the cooking temperature, and in pressure cooking, if the uneven time is set after cooking, the taste will be poor, so the uneven time can also be set using a timing means, and the present invention can also be applied to such a translator.

FIG. 5 is a circuit diagram of a cooking device control device according to another embodiment of the present invention in such a cooking device, and parts corresponding to those in FIG. 6 are given the same numbers.

FIG. 6 is a time chart of the circuit diagram shown in FIG.

In FIG. 5, the time measuring means (TM) controls six switch means, each of which has the following role. First, as in the above example, @'fM! is connected in series to the heater (7). The city of vessels, the switch that is the source switch ('t
'5w1), then a switch (TSW2) to set the heating time during normal operation, and finally a switch (TSW2) to set the cooking time, and switch the heater (7) notification and control set temperature to 111 and for keeping warm. It is a switch (TOWro).

In the same figure, the circle is the first detector that operates the old time means (TM) after the food to be cooked reaches a certain temperature, and the operating temperature reaches a temperature (T2) lower than the cooking temperature (T1). It consists of a set hysteresis comparator, etc. 00) is a second detector for detecting an abnormality, and its operating temperature is set to a temperature (T3) higher than the cooking temperature ('l' l). These first and second detectors (1 Aegawa) are connected to Noah Gate (1,5! (1,61
Through a logic circuit consisting of an AND gate (1η), the clock means ('I'M) is connected to a controlling drive circuit (13).The drive circuit (13) is connected to a master-slave semiconductor switch element ( A circuit using 1roa) (1rob) is illustrated.

The operation will be explained using FIG. The cook uses the timekeeping means (T
M,), the switch (TSW
l) is connected and cooking starts, and at this time the switch (TS
W2) (TSW) are both connected, the output of the first detector is at "L" level, and the output of the second detector (10) is at rHJ level. (Noa game) (Since 1G+ is at the "L" level, the timing means (TM) is not working properly. As cooking progresses, the temperature sensing element (4) detects that the food to be cooked has reached the temperature (T2). Then, since the output of the first detector (1) becomes the rHJ level, the NOR gate 06) is inverted from the "L" level to the "■" level, and the timer (TM) starts operating at time t1 as the start time. Start. When the cooking time has elapsed, the switch (TSW filter) is turned off and the temperature drops. When the temperature drops slightly below (T2), the first detection gR (14) is inverted to "L" level, but one input of NOR gate 05) is set to 14J level by the switch (TSW3), so the timekeeping operation continues. continues, and the switch (TOW2) is turned off after the irregularity time has elapsed. At this time, the output of the NOR gate (161) is inverted, and the timer (T M ) stops the timer 11ijl ii, which has turned on the switch (TSWl).

The cook may then reset the timer (TM) to "off," but even if the timer is left unattended, the f♀ temperature will be automatically set.

- When an abnormality occurs at time t2 and the temperature exceeds 2, when the WFA element (4) outputs that the temperature is higher than the temperature (T3), the output of the second detector α0) reaches the rLJ level. Since it is inverted, the NOR gate (16) is at the "■" level regardless of the output level of the first detector α4), and the clock hand pQ (TM) starts counting time and reaches the "off" state.

In these examples, the timekeeping means (TM) is one that measures time by energizing, but it is also possible to count using a microprocessor or the like, or one that uses a register. In devices that count pulses, the time base may be manipulated to output a faster clock in the event of an abnormality.

(f) Effects of the Invention As described above, the present invention includes a temperature measuring element that detects the temperature of the food to be cooked, a heater that heats the food to be cooked, a switch means connected in series to the heater and controlled by a clock means, a first drive means that operates the timer according to the progress of cooking and stops the timer while the switch means is in an energized state; and a second drive means that operates the timer when the temperature detection element outputs a temperature equal to or higher than a predetermined temperature. Since this cooker control device is equipped with a drive means, overheating can be prevented for a long time without additionally providing a power switch means.

[Brief explanation of the drawing]

FIG. 1 is a temperature program diagram of a cooking appliance targeted by the present invention, FIG. 2 is a circuit diagram of a conventional control device, FIG. 6 is a circuit diagram of a cooking appliance control device according to an embodiment of the present invention, and FIG. The figure is a time chart diagram of the contacts of the time measuring means, FIG. 5 is a circuit diagram showing another embodiment of the present invention, and FIG. 6 is a time chart diagram thereof. (T81) (T8W1 >... Switch, (
TM)...Time measuring means, (4)...Temperature measuring element, (7)...Heater, (8)...
Control element, (9)...Detector, 00)...
...Second detector, (131... Drive element, α
3)...Drive circuit, (14)...First
detector.

Claims (1)

[Claims] 1) Wave harmonic +711 A temperature measuring element that detects the temperature of the object, a heater that heats the food, and an H1 sensor that is connected in series to the heater.
switch means controlled by the time means and JunJJlj
a first drive means that operates the timer according to the progress of the temperature measurement and stops the timer while the switch means is in an energized state; 1. A control device for a cooking appliance, characterized in that it is equipped with a driving means.