JPS60129812A - Electric range - Google Patents

Abstract

PURPOSE:To safely use a heating body by blocking the electric power supply to another heating body even when the secondly mentioned heating body is in trouble by leak, etc., by using both a switch and two-way thyristor and cutting off both terminals of the heating bodies from an AC power source. CONSTITUTION:When power supply is set by rotating a rotary volume 16, an interlocked switch 19 is closed and one terminal of a heating body 4 is connected with an AC power source 2. Simultaneously, a switch 17 for signal is closed and power supply is set. The set value of power supplying rate by the position of the volume 16 is transmitted to a microcomputer 7 after the electric potential at the connecting point of a resistance 15 and volume 16 is changed and AD-converted. Upon receiving the signal, the computer determines the power supplying rate and the rate is displayed by a display means 8 and, at the same time, the power supply to the heating body 4 is controlled by sending a control signal to a driving means 9 and driving a two-way thyristor 10. The same operation is performed at another heating body 5 independently from the heating body 4.

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to the structure of a conventional example of an electric oven equipped with a plurality of heating elements, and its problems. Conventional mechanical contacts are being replaced by semiconductor devices such as bidirectional thyristors to improve reliability. Even in electric ranges, the conventional bimetal timer-based power supply control has been replaced with power supply control using bi-directional cyrisks and control circuits. However, unlike other home appliances, electric ranges have a structure in which the heating element is exposed on the top surface, so there are many failures due to leakage of the heating element, etc. The single-cut method was unsafe and inconvenient in use.

Hereinafter, a conventional electric range in which the amount of electricity is controlled by a bidirectional thyristor and a control circuit will be explained with reference to FIG. When the main switch 1 is closed, power is supplied from the AC power supply 2 to the power supply circuit 3, a control circuit power supply is formed, and one terminal of the first heating element 4 and the second heating element 5 is connected to the AC power supply 2. Ru. When the energization rate is set by the first setting means 6, the energization rate is determined by the microcomputer 7, and the energization rate is displayed by the display means 8 using an LED or the like, and a control signal is sent to the first drive means 9. The first bidirectional cyrisk 10 is driven to control the energization of the first heating element 4. When the energization rate is set by the second setting means 11, the microcomputer 7
The energization rate is determined, and the energization rate is displayed on the display means 8 using an LED or the like, and a control signal is sent to the second drive means 12, which drives the second bidirectional cycler 13 and drives the second heating element 5. Controls energization.

By the way, in an electric range having a plurality of heating elements, since the current is large, a 200V power source is used, and in consideration of safety against leakage, the electric range casing is grounded and has a 30-outlet structure. If the heating element 4 leaks electricity in this electric range, when the main switch 1 is closed, the first
Regardless of the energization setting of the setting means 6, current flows to the housing 14 through the heating element 4, creating a dangerous situation for the user.If the ground wire of the AC power supply 2 becomes defective, the AC potential will continue to flow through the housing. It can also be exposed to the body and become very dangerous. However, for safety reasons, the AC power supply 2 is instructed to be connected to an earth leakage breaker. However, when passing through an earth leakage breaker, if the heating element 4, which is one of the plurality of heating elements, leaks, the main switch 1 The moment the switch is closed, the leakage current flows between the AC power supply 2 - main switch 1 - heating element 4 - housing 1
4- There was a problem in which the ground wire and current leakage breaker were tripped, rendering the entire electric range unusable. Since the electric range is the main cooking appliance in the kitchen, it was a big problem that it became completely unusable.

Purpose of the Invention The purpose of this invention is to solve the above-mentioned problem by separating the power lines at both ends of the heating element, and even if the main switch is closed, the individual heating elements and the AC power source will not be connected unless the individual energization settings are made. An object of the present invention is to provide an electric range using a energization rate control method using a bidirectional thyristor.

Structure of the Invention In order to achieve the above object, an electric range according to the present invention includes a plurality of heating elements and a plurality of energization rate setting means that can individually set the energization rate of these heating elements, and one energization rate setting means. When the energization setting is made, a switch interlocked with the energization rate setting means connects one terminal of the heating element to the AC power supply, and upon receiving a setting signal from one of the energization rate setting means, the energization rate determining means such as a microcomputer is activated. Determine the energization rate with
A configuration in which a driving means composed of a transistor or the like is controlled, and this driving means drives a bidirectional thyristor connected in series with the heating element and an AC power source on the opposite side of the switch via a heating element to control the energization rate. It's an old thing.

DESCRIPTION OF EMBODIMENTS The present invention will be described in detail below with reference to FIGS. 2 to 6. FIG. 2 is a circuit configuration diagram according to the present invention. In addition, the first
The same reference numerals are used for the same components as in the figures. When the main switch 1 is closed, power is supplied from the AC power supply 2 to the power supply circuit 3, and a control circuit power supply is formed. Also, resistor 15)-
A rotary volume 16 and a signal switch 17 are connected in series to a DC power supply, and a connection point between the resistor 16 and the rotary volume 16 is connected to an A/D converter 18 to form a first energization rate setting means 6. . rotary volume 1
6 to set the energization, the linked first switch 19 is closed, and one terminal of the first heating element 4 is connected to the AC power source 2.
connected to. At the same time, the signal switch Sochi 17 linked to the rotary volume 16 is closed, lowering the potential at the connection point between the resistor 16 and the rotary volume 16, and setting the energization. Instead, the error is transmitted to the microcomputer 7 as a digital signal by an A/D converter. In response to the above signal, the microcomputer 7 determines the energization rate, and displays the energization rate using an LED or the like on the display means 8. In the above table, a control signal QNloFF is sent to the first driving means 9 and the first both The opposite thyristor 1o is driven to control the energization of the first heating element 4. Once the first switch 19 is set to be energized, it remains closed, and the energization rate control by QNloFF is performed by the bidirectional thyristor 1o. Resistor 2○, rotary volume 21, signal switch 2
2 and an A/D converter 23, the second switch 24 is closed independently of the first setting means 6, and the second switch 24 is closed. One terminal of the second heating element 6 is connected to the AC power supply 2. At the same time, the microcomputer 7 determines the energization rate, and the LED
The energization rate is displayed on the display means 8, and a control signal of ○N10FF is sent to the second drive means 12.
The two-way thyristor 13 is driven to control the energization of the second heating element 5.

Next, the rotary volume 16 and the signal switch 17 are linked with the first switch 19, and the rotary volume 21, the signal switch 22, and the second switch 2 are linked.
The interlocking configuration with 4 will be explained. Note that since the two interlocking configurations are the same, the rotary volume 16
The interlocking structure of the signal switch 17 and the first switch 19 will be explained. Figure 3 is a side view of the Sui-Sochi configuration.
FIG. 4 is a plan view. Two microswitches 27 and 28 are aligned with a U-shaped support fitting 26 with screws 26.
are the first switch 19 and the signal switch 17 having the circuit configuration shown in FIG.

The actuator 31 common to the microswitches 27 and 28 is moved by a resin cam 3o press-fitted into the rear shaft 29 of the rotary polygon 16 which is also fixed to the support fitting 26, and the microswitches 27 and 28 are simultaneously set to 0N10.
This is a configuration that causes FF.

FIG. 5 is a sectional view taken along the line A-A, showing a state in which the power supply is stopped. In this state, micro switches 27 and 28
The knobs 32 and 33 push up the actuator 31,
The microswitches 27 and 38 are in the OFF state after falling into the cam 30, and the energization rate is zero. FIG. 6 shows a state in which the rotary volume 16 is turned to the right. The cam 3Q pushes down the actuator 31 and pushes the knobs 32T33 of the microswitches 27 and 28, turning on the microswitches 27 and 28 at the same time.

When the microswitches 27 and 28 are turned on, the heating element 4 is connected to the AC power source 2 and energization is set, and the 0N10FF energization restriction of the bidirectional thyristor 1o is applied. As you can see from the shape of the cam 3o, the micro switch 27.
28 remains ON in the energized state, and the energization rate is set based on the rotational position of the rotary volume 16, and is configured to be side-controlled by the bidirectional thyristor 1O.

Although the configuration example of the present invention uses a microswitch, it is also possible to replace the first and second switches with relay contacts. A one-relay type has the advantage that the present invention can be realized using a microcomputer memory and instantaneous key switch for energization setting. Furthermore, it goes without saying that the present invention can also be realized by using another bidirectional thyristor in place of the first and second switches.

Effects of the Invention As is clear from the above explanation, in the electric range according to the present invention, both terminals of the heating element are disconnected from the AC power supply using a combination of a switch and a bidirectional thyristor, so no heat is generated unless energization is set. The body is completely disconnected from the AC power supply.In this case, even if one of the multiple heating elements breaks down due to an electrical leak, the other heating elements must be set to energize only this heating element. It is safe to use.Also,
While the energization setting is being made, the switch with the mechanical contact remains closed, and the 0N10FF energization rate is controlled by a bidirectional thyristor, so the advantages of electronic control are not lost in terms of life, and the product has great industrial utility. It is something.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional electric range, Fig. 2 is a circuit diagram of an electric range according to an embodiment of the present invention, Fig. 3 is a side view of the switch, and Fig. 4 is a plan view of the switch. , 6th
The figure and FIG. 6 are sectional views taken along the line AA in FIG. 3. 4.5... Heating element, 6, 11... Energization rate setting means, 7... Microcomputer, 9
, 12... Drive means, 10.13...
Bidirectional thyristor, 19°24... switch.

Claims (1)

[Claims] A plurality of heating elements, a plurality of energization rate setting means for individually setting the energization rate of the heating elements, and a plurality of energization rate determining means for individually determining the energization rate based on a setting signal from the energization rate setting means. a plurality of driving means for individually controlling the amount of current applied to the six generators according to a control signal from the energization rate determining means; multiple bidirectional cyrisks controlled by
An electric range comprising a plurality of switches that are connected in series with the heating element to the side opposite to the bidirectional thyristor via the heating element and turn on/off AC power in conjunction with the energization rate setting means.