JPH0128575B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an automatic roasting device that can always roast to the same brown color set by the user when roasting is repeated two or more times. .

Configuration of conventional examples and their problems In many conventional roasting methods, for the same setting, the first and second roasting times are the same, and in the second roasting time when the temperature of the vessel is rising, For example, when baking bread, it is inevitable that the bread will be darker than the first time. Therefore, in conventional automatic toasters, charging and discharging of CR was used to compensate for the rise in temperature of the toaster. That is,
Figure 1 shows a circuit diagram of this system, where 1 is an AC power supply, 2 is a contact connected to the AC power supply 1,
When this contact 2 is turned on, a voltage is applied to the heater 3 and energization of the heater 3 is started. At the same time, the smoothing capacitor 6 is charged to a constant voltage via the resistor 4 and diode 5. The constant voltage is then divided by resistors 7 and 8 to obtain a reference voltage Vr. On the other hand, variable resistor 1 is connected to capacitor 9.
0, charging starts through the diode 11, and the voltage Vc of the capacitor 9 increases. When the voltage Vc of this capacitor 9 becomes almost the same as the reference voltage Vr, the PUT 12 performs a switching operation and turns on, and as a result, the charge of the capacitor 9 is discharged through the resistor 13, and the thyristor 14 is made conductive by the discharge current. do. And this thyristor 14
When the coil 15 becomes conductive, the coil 15 is energized, which opens the contact 2 which was mechanically latched to the closed contact, and stops energizing the heater 3. As is clear from this operation, the voltage Vc of capacitor 9 is equal to the reference voltage
The time it takes to rise to Vr is the energization time to heater 3,
That is, the time _tON1 shown in FIG. 2 is obtained. If the contact 2 is turned on again for a certain period of time after the power supply to the heater 3 is stopped, that is, while the charge in the capacitor 9 remains, the capacitor 9 will be recharged. Voltage Vc
The time required for the voltage to rise to the reference voltage Vr will be shortened by the amount of charge remaining in the capacitor 9, that is, the time _tON2 shown in Figure 2 will shorten the roasting time. , it is possible to correct the burnt condition.

However, when the above method is repeatedly used in actual use, it often happens that the time t _OFF1 shown in FIG. 2 is short, and in this case, when the time t _OFF1 becomes short, the The time t _ON2 required for the voltage Vc to rise to the reference voltage Vr becomes extremely short, and as a result, if this time t _ON2 is 10 or 20 seconds, the heater 3 will not be energized before the second bread is baked at all. This caused the system to stop, which was extremely inconvenient in practice.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
To provide an automatic roasting device which can always obtain a constant degree of toasting when repeatedly baking bread and can eliminate insufficient baking of bread.

Structure of the Invention In order to achieve the above object, the present invention includes a setting means for setting a timer time, and a setting state determining means for dividing the setting state of the timer time into several stages based on the output of the setting means and determining the setting state of the timer time. , a load state detection means for detecting the energization state of the load (energized or de-energized), and an energization memory that stores the energization time, the number of energization times, and the de-energization time to the load up to the previous time based on the output of the load state detection means. calculating a correction value for the current energization time to the load based on the output of the energization storage means, and determining the current energization time by subtracting this correction value from the setting time determined by the setting state determining means; According to this configuration, the present invention includes an energizing time determining means having a predetermined minimum energizing time, and a load energizing means for energizing the load for the time determined by the energizing time determining means.
Roasting status from the current roasting setting time to the previous roasting time (load energization time, energization frequency, and non-energization time)
Since the correction value obtained by calculating The reduced actual energization time becomes extremely short, which eliminates the inconvenience that the bread is not actually baked.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 3 shows a block diagram of an automatic roasting device according to an embodiment of the present invention.
22 is a setting state determining means for dividing the setting state of the timer time into N stages (N is a natural number) based on the output of the setting means 21, and 23 is a setting means for setting the timer time. A load state detection means 25 detects the energization state, that is, whether the load 24 is energized or not, and a load state detection means 25 detects the energization time, the number of energization times, and the non-energization time to the load 24 up to the previous time based on the output of the load state detection means 23. The stored energization storage means 26 calculates a correction value for the current energization time to the load 24 based on the output of the energization storage means 25, and calculates a correction value for the current energization time to the load 24, and
An energization time determining means 27 determines the current energization time by subtracting this correction value from the set time determined by and has a predetermined minimum energization time. This is a load energizing means that energizes the load.

Fig. 4 shows the specific circuit configuration of the automatic roasting device, where 31 is an AC power source, 32 is a contact connected to the AC power source 31, and when this contact 32 is closed, the heater 33 is energized. Begins. This energization starts with resistors 34, 35, 36 and diode 3.
7. The signal is input to the microcomputer 39 through the transistor 38 circuit. That is, contact 3
2 is open, transistor 38 is off and the collector voltage of transistor 38 is approximately equal to +V _DD . On the other hand, contact 32
is closed, a voltage divided by resistors 34 and 35 is applied to transistor 38 in the positive half wave according to the frequency of the AC power supply, and this transistor 3
8 turns on. In this case, the collector voltage of transistor 38 becomes approximately equal to GND. Further, in the negative half wave, a current flows through the resistor 34 and the diode 37, and the transistor 38 is turned off. By opening and closing the contact 32 in this way, a square wave having the same frequency as the frequency of the AC power source is output to the collector of the transistor 38, and this is input to the microcomputer 39. Similarly, the microcomputer 39 uses the resistor 4.
0, 41, 42, a diode 43, and a transistor 44 in the circuit, the power supply frequency is monitored, and this cycle is used as the reference time of its own timer.

The timer time is set by the variable resistor 45, and the A/D converter 46 determines the number of the timer time and inputs it to the microcomputer 39. (Set time Ts) Then, the microcomputer 39 subtracts the correction time T _H , and when the time Ts - T _H elapses after the start of energization, the microcomputer 39 outputs an output and turns off the transistor 47, which is normally on. do. As a result, the gate of the thyristor 50 is triggered by the resistors 48 and 49, and the gate of the thyristor 50 is triggered.
0 conducts. The conduction of the thyristor 50 excites the coil 51, opens the contact 32 which was mechanically latched to the closed contact, and stops energizing the heater 33.

Next, the operation when the automatic roasting apparatus according to an embodiment of the present invention is applied to a toaster will be explained using the flowchart shown in FIG.

The user first puts bread into the toaster and presses the switch to close the contacts 32. As a result, step 101 is passed, and in the case of the second or subsequent roasting, the off time timer is stopped in step 102, and the time information up to that point is stored in step 103. Next, in step 104, the on-time timer is started, and in step 105, the set time Ts set by the variable resistor 45 is input. Further, in step 106, it is determined how many times the current has been turned on, and depending on the number of times, for example, the first time is step 107, the second time is step 108, M
At step 109, the correction time T _H is calculated using the time information (the energization stop time of each previous time) stored in the energization storage means 25 as a parameter.
Then, in step 110, the actual energizing time (Ts - T _H ) is calculated, but if we consider the case where the actual energizing time is very short, we can see how the temperature of the toaster has increased due to previous use. Even so, it turns out that bread cannot be baked if the electricity is turned on for about 10 seconds, for example. Generally, as in one embodiment of the present invention, a time of around 60 seconds, that is, a predetermined minimum energization time is required.Therefore, in one embodiment of the present invention, in step 111, the actual energization time is less than 60 seconds. If it is less than 60 seconds, the actual energization time is set to 60 seconds in step 112. Then, in step 113, energization is continued as in step 114 until the on-time timer elapsed time reaches the actual energization time, and when the actual energization time is reached,
In step 115, the load is energized, and in step 116
to stop the on-time timer. Then, in step 117, an off time timer is started and the process waits for the next switch to be pressed.

According to the above embodiment, when repeatedly toasting bread in a toaster, the user only needs to set the desired browning color once using the setting means 1, and the energization time will gradually become shorter each time from the second time onwards. The user can obtain bread with the same desired brown color without having to go through the trouble of resetting the settings. Another step
112, it is configured so that the actual energization time is at least 60 seconds, which eliminates the possibility of under-baked bread.

Effects of the Invention As described above, according to the present invention, when roasting is repeated two or more times, the roasting status from the current roasting setting time to the previous roasting state (load energization time, energization frequency, Equipped with an energizing time determining means that reduces the correction value obtained by calculating the de-energizing time),
Since a constant degree of baking can always be achieved with high precision, and the energization time determining means has a predetermined minimum energization time, the actual energization time (the set time minus the correction time) is extremely short, and the actual bread is This eliminates the inconvenience of not being cooked.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing a conventional example, Fig. 2 is a characteristic diagram showing changes in capacitor voltage and reference voltage in the conventional circuit, and Fig. 3 is a block diagram of an automatic roasting apparatus showing an embodiment of the present invention. 4 are specific electrical circuit diagrams of the roasting apparatus, and FIG. 5 is a flowchart showing the operation of the roasting apparatus. 21... Setting means, 22... Setting state determining means, 23... Load state detecting means, 24... Load,
25... Energization storage means, 26... Energization time determining means, 27... Load energization means.

Claims (1)

[Claims] 1. A setting means for setting the timer time, a setting state determining means for dividing the setting state of the timer time into several stages based on the output of the setting means, and determining the setting state of the timer time;
A load state detection means for detecting the energization state of the load (energized or de-energized), and an energization storage means for storing the previous energization time, the number of energization times, and the de-energization time to the load based on the output of the load state detection means. and calculates a correction value for the current energization time to the load based on the output of the energization storage means, and determines the current energization time by subtracting this correction value from the setting time determined by the setting state determining means, and An automatic roasting apparatus comprising an energizing time determining means having a predetermined minimum energizing time, and a load energizing means for energizing a load for the time determined by the energizing time determining means.