JP2894138B2 - Electric cooker control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric cooker such as an oven toaster used in ordinary households.

[0002]

2. Description of the Related Art Conventionally, an oven toaster used in ordinary households has a structure in which heaters 3 and 4 are mounted in a heating chamber 2 provided in a main body 1 as shown in FIG.
The heaters 3 and 4 are turned on by a relay or the like for a predetermined time set by a timer, and the material 5 such as bread placed inside the heating chamber 2 is heated and cooked. 6 is a printed board on which a control unit having functions such as a timer and a relay drive circuit is mounted, 7 is a timer for setting a time,
The setting means is shown.

FIG. 6 is a block diagram of an oven toaster. A timer setting means 7 and a heating power setting means 8 are connected to a control section 6 having a timer and a power switching function. Activate the drive circuit 9,
The relay contacts 10 connected to the heaters 3 and 4 are opened and closed to control the energization of the heaters. In the case of cooking, the cooking time is set by the timer setting means 7, the duty ratio of the heater is selected by the heating power setting means 8, and the material 5 inside the heating chamber 2 is heated with a constant heating power for a certain time. Do it. However, in such a configuration of the electric cooker, when the power supply voltage changes, the power of the heater changes, which significantly affects the cooking completion. Therefore, the power supply voltage detecting means 11 is provided. The heating power or the set time is changed by the output of the detecting means 11 so that a constant cooking performance can be obtained even when the power supply voltage changes. FIG. 7 shows the characteristics of the power supply voltage detecting means 11,
The detection voltage changes according to the input power supply voltage, and the duty ratio and the power supply time set by the control unit 6 are changed according to the detected voltage, so that constant cooking can be performed even when the power supply voltage changes. .

[0004]

However, in the above configuration, the value of the power supply voltage drops by the resistance of the power supply cord shown by r in FIG. Are deviated, and the set original duty ratio and the set energization time cannot be obtained.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a control device for an electric cooker according to the present invention comprises a heater provided in a main body, a relay contact connected in series to the heater, and turning on and off the relay contact. Heater power supply control means for controlling power supply to the heater, and a voltage detection means for AC power supply; a power supply time change means for changing a power supply time of the heater power supply control means with an output of the voltage detection means for AC power supply; A control means for the electric cooker, comprising: a shift means for shifting the output of the voltage detection means, and a shift means for shifting the output of the voltage detection means so that the value to be shifted by the shift means matches the voltage drop value of the power cord. I do.

A heater provided in the main body, a relay contact connected in series with the heater, heater power switching means for turning on and off the heater by the relay to change heating power, a rectifier and a Zener from an AC power source. A first direct-current voltage source configured through a voltage-reducing means comprising a diode, and a stabilized second direct-current voltage source, and detecting a potential difference between the first and second direct-current voltage sources to detect a power supply voltage; Power supply voltage detection means for detecting the power supply voltage, and a shift means for shifting the output of the voltage detection means. The shift value of the shift means is made to match the voltage drop value of the power supply cord. The control device of the electric cooker is configured to automatically switch the heater power set by the switching means.

Also, a heater provided on the main body, a relay contact connected in series with the heater, heating time switching means for changing the heating time by turning the heater on and off by the relay, a rectifier and a Zener from an AC power source. A first direct-current voltage source configured through a voltage-reducing means comprising a diode, and a stabilized second direct-current voltage source, and detecting a potential difference between the first and second direct-current voltage sources to detect a power supply voltage; Power supply voltage detection means for detecting the power supply voltage, and a shift means for shifting the output of the voltage detection means. The shift value of the shift means is made to match the voltage drop value of the power supply cord. The control device of the electric cooker is configured to automatically switch the heater energizing time set by the switching means.

[0008]

According to the present invention, the power supply voltage drop characteristic of the power supply cord is shifted by the shift means by the shift means, so that the power supply voltage detection characteristic set for the substrate alone and the characteristic when incorporated into the main body match. The effect of the voltage drop is eliminated.

Further, since the set value of the power supply voltage of the main body and the detected voltage of the shifted substrate coincide with each other, an output value of the power switching means corresponding to the set voltage can be obtained, and the characteristic set on the substrate can be obtained. This is also realized when the main body is incorporated, so that constant cooking performance can be always obtained.

Further, since the set value of the power supply voltage of the main body and the detected voltage of the shifted substrate coincide with each other, an output value of the heating time switching means corresponding to the power supply voltage applied to the main body can be obtained, and a desired cooking time can be obtained. Performance can be obtained.

[0011]

【Example】

(Embodiment 1) Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an electric cooker according to an embodiment of the present invention.
0 and 21 are attached to the heating chamber of the main body. 22
Is a relay contact, which is driven by the relay drive circuit 23 and turns on and off.

Reference numeral 24 denotes a heater energization control means constituted by a microcomputer or the like, and also includes an energization time changing means by a program.

A power supply voltage detecting means 25 supplies a detected voltage corresponding to the power supply voltage to the power switching means and the power-on time changing means. Reference numeral 26 denotes a shift unit for shifting the output of the power supply voltage detection unit, which shifts by a detection voltage corresponding to the resistance 2 · r of the power supply cord. Reference numeral 27 denotes an energization time changing unit, which is an input unit for setting the energization time. Reference numeral 28 denotes output means for displaying an operation state. With this configuration, the control characteristic shifts the drop voltage at the power cord resistance 2 · r in advance, so that at 100 V, the control characteristic of the substrate alone shows the control characteristic at the power supply voltage higher by the drop voltage. become. Therefore, when incorporated in the main body, 100
When V is applied, the voltage drops due to the resistance of the power cord, and a voltage lower than 100 V is applied to the control board, but the control characteristics show the control characteristics of 100 V applied to the main body.

FIG. 2 is a circuit diagram showing an embodiment of the present invention. The heaters 20 and 21 are mounted in a heating chamber of an oven toaster, and the power is switched by turning the heater on and off by a relay 22. Reference numeral 23 denotes a relay drive circuit, which is connected to a microcomputer constituting power switching means 24.

A first DC voltage source 25 is connected to an AC power source via a diode 26, a source voltage means 7 composed of a Zener diode, and a resistor 28, and generates a DC output voltage proportional to the AC power source. Reference numeral 29 denotes a stabilized second DC voltage source, which detects the potential difference between the first and second DC voltage sources by a power supply voltage detecting means 30. Reference numerals 31 and 32 denote varistors for correcting temperature characteristics, and reference numeral 33 denotes a Zener diode for correcting a potential difference between the first and second voltage sources.
The voltage of the difference between the second DC voltage source and the second DC voltage source is charged in the capacitor. The voltage is applied to microcomputer 24 A
Input to the D converter 35. Reference numerals 36 and 37 are input protection diodes.

Reference numeral 37 denotes a heating power setting means and 38 denotes a display means connected to the microcomputer 24.

FIG. 3 is a flowchart of a microcomputer showing an embodiment of the present invention. When the cooking operation is started, first, the input of the AD converter 35 is taken in the first step. Next, in a second step, the input value is shifted in advance by the voltage corresponding to the voltage drop in the power cord. Then, the relay is turned on in the third step, and the energization time corresponding to the power supply voltage is determined between steps 4 and 13, and the heaters 20 and 21 are turned on and off at the determined duty to correct the change in the power supply voltage. Perform a thermal power switch.

FIG. 4 is a flowchart of a microcomputer showing an embodiment of the present invention. When a cooking operation is started, first, the input of the AD converter 35 is taken in a first step. Next, in a second step, the input value is shifted in advance by the voltage corresponding to the voltage drop in the power cord. Then, the relay is turned on in the third step, and the energization time corresponding to the power supply voltage is determined in steps 4 to 13. Electricity is supplied for the determined time, and cooking is performed according to the optimum cooking time for the power supply voltage.

In this embodiment, the value input to the AD converter is shifted by a predetermined value by a program. However, the output value of the potential difference detecting circuit 20 may be shifted in advance and input to the AD converter. Good.

[0021]

As is apparent from the above embodiment, according to the present invention, by correcting the voltage drop of the power cord of the main body in advance, the input voltage of the main body can be maintained even after the control board is incorporated in the main body. Corresponding operating characteristics will always be obtained, and it will be possible to prevent a mismatch between the control characteristics and the input voltage, thereby realizing a cooker having a highly practical voltage correction function. high.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device of an electric cooker according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of an electric cooker according to one embodiment of the present invention.

FIG. 3 is a flowchart of a program according to an embodiment of the present invention.

FIG. 4 is a flowchart of a program according to an embodiment of the present invention.

FIG. 5 is a sectional view showing an example of the configuration of a conventional electric cooker.

FIG. 6 is a block diagram showing an example of a configuration of a conventional electric cooker.

FIG. 7 is a characteristic diagram of a power supply voltage detecting unit.

[Explanation of symbols]

 Reference Signs List 20 heater 21 heater 22 relay contact 23 relay drive circuit 24 heater conduction control means 25 voltage detection detection means 26 voltage detection means output shift means 27 conduction time changing means

Claims (3)

(57) [Claims] A heater provided in the main body, a relay contact connected in series to the heater, heater energization control means for turning on and off the relay contact to control energization of the heater, voltage detection means for an AC power supply, An energization time changing means for changing the energization time of the heater energization control means with an output of the voltage detection means of the AC power supply, and a shift means for shifting the output of the voltage detection means are provided. A control device for an electric cooker, comprising a shift means for shifting the output of a voltage detection means to match a voltage drop value. 2. A heater provided on a main body, a relay contact connected in series with the heater, heater power switching means for turning on and off the heater by the relay to change heating power, a rectifier and a Zener from an AC power supply. A first direct-current voltage source configured through a voltage-reducing means comprising a diode, and a stabilized second direct-current voltage source, and detecting a potential difference between the first and second direct-current voltage sources to detect a power supply voltage; Power supply voltage detection means for detecting the power supply voltage, and a shift means for shifting the output of the voltage detection means. The shift value of the shift means is made to match the voltage drop value of the power supply cord. A control device for an electric cooker in which a heater power set by a switching means is automatically switched. 3. A heater provided in the main body, a relay contact connected in series with the heater, heating time switching means for turning on and off the heater by the relay to change a heating time, a rectifier and a Zener from an AC power supply. A first direct-current voltage source configured through a voltage-reducing means comprising a diode, and a stabilized second direct-current voltage source, and detecting a potential difference between the first and second direct-current voltage sources to detect a power supply voltage; Power supply voltage detection means for detecting the power supply voltage, and a shift means for shifting the output of the voltage detection means. The shift value of the shift means is made to match the voltage drop value of the power supply cord. A control device for an electric cooker that automatically switches a heater energizing time set by a switching unit.