JPH0128576B2 - - 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, the first and second roasting times are the same, and during the second roasting time when the temperature of the container is rising, for example, when baking bread, the baking time is the same. It was inevitable that my condition would be worse than the first time.
Additionally, there are some methods that use the charging and discharging of CR to compensate for the temperature rise in the container body, but this method will be explained here as a conventional example.

Figure 1 shows a circuit diagram of the above method.
2 is a contact connected to an AC power source, and 2 is a contact connected to an AC power source 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. Then, that constant voltage is divided by resistors 7 and 8 to become a reference voltage.
You can get Vr. On the other hand, charging of the capacitor 9 is started through the variable resistor 10 and the diode 11, and the voltage Vc of the capacitor 9 increases. The voltage Vc of this capacitor 9 is the reference voltage
When the voltage becomes approximately equal to Vr, the PUT 12 performs a switching operation and turns on, and as a result, the charge in the capacitor 9 is discharged through the resistor 13, and the thyristor 14 is made conductive by the discharge current. When the thyristor 14 becomes conductive, the coil 15 is energized, opening the contact 2 which was mechanically latched to the closed contact.
The power supply to the heater 3 is stopped. As is clear from such an operation, the time during which the voltage Vc of the capacitor 9 rises to the reference voltage Vr is the time during which the heater 3 is energized. 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.
The time required for the voltage Vc of the capacitor 9 to rise to the reference voltage Vr is shortened by the amount of charge remaining in the capacitor 9, and as a result, the roasting time is shortened, so the degree of roasting can be corrected. It is something that can be done.

However, with this method, since the third and subsequent times use the same correction method as the second time, correct corrections are not made, resulting in a darker burnt appearance, and also due to changes in ambient temperature and other conditions. There was a problem in that the variations in the values of the capacitor 9 and the variable resistor 10 also increased, resulting in poor accuracy in roasting time.

Purpose of the invention The present invention solves the above-mentioned conventional problems.
It is an object of the present invention to provide an automatic roasting device that can compensate for the rise in temperature of the container and always achieve a constant degree of roasting, no matter how many times it is used.

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. and a correction value for the current energization time to the load is calculated based on the output of the energization storage means, and the current energization time is determined by subtracting this correction value from the setting time determined by the setting state determining means. It is equipped with an energizing time determining means, and a load energizing means for energizing the load for the time determined by the energizing time determining means,
According to this configuration, the correction value calculated by calculating the previous roasting state (load energization time, number of energization times, and non-energization time) from the current roasting set time is reduced. This allows you to always get a constant degree of burntness.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. FIG. 2 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 this correction value from the setting time determined by the setting state determination means 22. 27 is a load energizing means that energizes the load 24 for the time determined by the energizing time determining means 26.

FIG. 3 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 T _S - T _H elapses after the start of energization, the microcomputer 39 outputs an output and turns off the transistor 47, which is normally on. Make it. 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 mechanically latched contact 32, 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 T _S 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 energization time (T _S - T _H ) is calculated, and the energization is continued as in step 112 until the on-time timer elapsed time reaches the actual energization time, and when the actual energization time is reached, step
The energization of the load 24 is terminated in step 113, and the on-time timer is stopped in step 114. and step
115 starts the off time timer and waits for the next switch to be pressed.

Among the above steps, the loop returning from step 112 to step 111 is repeated from step 112 to step 111.
By returning to 105, even if the set time is changed while the power is on, the timer time can be corrected to match the setting.

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. Further, by performing calculation processing using the microcomputer 39, the time varies only by the variation in the resistance value of the variable resistor 45, and therefore the accuracy of the timer time can be improved. Furthermore, in the conventional example, CR charging/discharging, that is, the energization time,
Whereas it was necessary to approximate the energization stop time using a curve with the same characteristics, in the above embodiment, the correction time can be freely set according to the characteristics of both the energization time and the energization stop time, which improves accuracy. A good automatic roasting device can be obtained.

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, Since the correction value obtained by calculating the de-energized time is reduced, it is possible to provide an automatic roasting device that can always achieve a constant degree of roasting with high accuracy.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing a conventional example, Fig. 2 is a block diagram of an automatic roasting apparatus showing an embodiment of the present invention, and Fig. 3 is a specific electric circuit diagram of the same roasting apparatus.
FIG. 4 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. Then, a correction value for the current energization time to the load is calculated based on the output of the energization storage means, and the current energization time is determined by subtracting this correction value from the setting time determined by the setting state determining means. An automatic roasting device comprising a time determining means and a load energizing means for energizing the load for the time determined by the energizing time determining means.