JPH0318092B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION This invention relates to an electric range having external setting means that can vary the amount of electricity supplied to a heating element.

Configuration of conventional example and its problems The operating section of a conventional electric range that allows the amount of energization to be arbitrarily set from the outside is as shown in Figure 1. , the amount of change in the amount of current was always constant. In other words, if the total amount of current is 1KW, W changes at a constant rate at equal intervals. 1 is a heating element,
2 is a display section for power settings, and 3 is an operation knob. However, when considering the actual heating process,
There is a problem in that the amount of change in the amount of current applied is constant. When I tried to adjust it to 800W,
Suppose there is a slight setting error, and if this is
If it is 100W, the setting error rate will be (100W/800W) x 100 = 12.5%. However, when trying to set 200W and assuming a similar setting error, (100W/
200W) x 100 = 50% setting error rate, which makes it extremely difficult to use, such as when things you try to simmer quickly run out of water.

Purpose of the Invention In order to solve the above-mentioned drawbacks, the present invention attempts to improve the usability of an electric range by always keeping the setting error rate the same, that is, by reducing the amount of change when the amount of electricity is small.

Composition of the Invention The present invention includes a heating element, a heating element control means for controlling energization of the heating element, and a heating element control means for determining the amount of electricity to be applied to the heating element and controlling the amount of electricity to be the determined amount of electricity. energization amount determining means for outputting an energization control signal to the energization amount determining means;
It has an oscillation circuit whose voltage changes according to a logarithmic function during charging and repeats charging and discharging, and a comparator that compares the charging voltage of this oscillation circuit with the DC voltage of the energization amount setting means, and the output of the comparator controls energization. The setting error rate of the energization amount by the energization amount setting means is substantially constant over the entire setting range.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4.

In FIG. 2, 6 is an AC power supply that supplies power to the control circuit and the heating element 1. capacitor 7, resistor 8, zener diode 9, resistor 10,
The diode 11 forms a power source for the control circuit.

A PUT (Programmable Union Transistor) whose anode and gate are connected to the connection point of the resistor 12 and capacitor 13 connected in series to both ends of the DC power supply, and to the resistors 14 and 15 also connected in series. ) 16 constitutes a tension oscillator. Further, a resistor 17 connected in series with the power supply, a variable resistor 19 interlocked with the normally closed switch 18, and a resistor 20 are used to set the energization amount setting means 3 for the user to arbitrarily set the energization amount. is forming. The potential of the center tap of the variable resistor 19 is set by the user, so that the amount of change in potential with respect to the amount of displacement is linear.

The comparator 21 compares the potential of the center tap point of the variable resistor 19 and the potential of the capacitor 13, and when the potential of the capacitor 13 is low, the thyristor 5, which is a heating element control means, is made conductive via the resistor 22. The heating element 1 is heated. Further, the above-described oscillator, comparator 21, and energization amount setting means 3 constitute energization amount determining means 4.

The states of energization rate control at this time are shown in Fig. 3 A, B, and
Indicated by C. A shows the case where the energization rate is high, B shows the case where the energization rate is low, and C shows the energization rate of zero when the switch 18 is in the "off" position, that is, the switch 18 is open. Further, a indicates the potential of the capacitor 13, and b indicates the potential of the variable resistor 19. Since the potential of the capacitor 13 is a logarithmic function due to the series connection of resistive capacitors, the rate of change in potential is greater when charging begins. On the other hand, since the change in the potential of the center tap of the variable resistor is set by the user, the amount of potential for the displacement is constant. Looking at the change in the amount of electricity, the case of B, where the amount of electricity applied is smaller,
It is clear from FIG. 3 that there is little change in the amount of current applied.

At this time, the operation panel will be displayed as shown in Fig. 4. In other words, if the total energization amount is 1KW, when the energization amount is small, around 100W, there will be little change in the energization amount with respect to the displacement of the variable resistor 19. On the other hand, when the amount of electricity is large, the amount increases, so a variable electricity range with very good usability is constructed.

In this example, an example using a variable resistor was shown, but the amount of energization is digitally set, which displays the amount of energization by the number of light emitting diodes by pressing a switch, and changes the amount of power according to the number of light emitting diodes. It can also be used for settings.

Effects of the Invention As is clear from the above description, according to the present invention, the energization control signal for the heating element control means is created by comparing the charging voltage that changes with a logarithmic function and the DC voltage that is proportional to the manipulated variable. The energization of the heating element is controlled by the energization control signal, and as the DC voltage level is gradually increased, the amount of current flowing through the heating element increases significantly. The energization amount can be set with little change.
In addition, when the amount of current applied to the heating element is large, the amount of current applied can be set with many changes, and therefore, the setting error rate of the amount of current applied by the amount of current setting means can be made almost equal over the entire setting range. You can improve your sexual performance.

[Brief explanation of the drawing]

Figure 1 is a front view of the operating section of a conventional electric range.
Figure 2 is a circuit diagram of an electric range showing an embodiment of the present invention, Figures 3A and B are signal waveform diagrams of the main parts of the electric range, and Figure 4 is a front view of the operating section of the electric range. be. 1... heating element, 3... energization amount setting means, 4...
energization amount determining means; 5...heating element control means;

Claims (1)

[Claims] 1. A heating element, a heating element control means for controlling energization of the heating element, and determining the amount of energization to the heating element,
The energization amount determining means outputs an energization control signal to the heating element control means so as to achieve the determined energization amount, and the energization amount determining means includes energization amount setting means that outputs a DC voltage proportional to the manipulated variable. , has an oscillation circuit whose voltage changes logarithmically during charging and repeats charging and discharging, and a comparator that compares the charging voltage of this oscillation circuit with the DC voltage of the energization amount setting means, and energizes the output of the comparator. An electric range that uses a control signal so that the setting error rate of the energization amount by the energization amount setting means is approximately constant over the entire setting range.