JP3622513B2 - an electronic pot - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric kettle that can keep boiling hot water at a high temperature and supply hot water with an electric pump.
[0002]
[Prior art]
Conventionally, in this type of electric pot, when the electric pot is to be exported to various countries as seen in, for example, Japanese Patent Laid-Open No. 10-56365, the temperature of the object to be heated is the same even if the commercial power supply voltage is different. Therefore, it has been an indispensable condition to make the capacity (electric power) of the heat retaining heater 2 the same.
[0003]
[Problems to be solved by the invention]
However, although the amount of hot water supply in the conventional electric pot is determined by the current flowing through the motor 23 as can be seen from FIG. 3, the heat retaining heater 2 is energized by the commercial power source 1 using the heat retaining heater 2 for voltage drop of the motor 23. Because the current (current) of the DC motor 23 is determined by the capacity (electric power), the hot water supply amount is determined. Therefore, when using the commercial power supply 1 from 100V to 240V, a hot water supply convenient for use is necessary, but a hot water supply amount above a certain level is obtained. It had the problem that it was not possible. In order to obtain a hot water supply amount above a certain level, it is necessary to change the motor rating every time the commercial power source 1 is changed.
[0004]
An object of the present invention is to solve such a conventional problem and to provide an electric pot capable of ensuring a certain amount of hot water supply even when the commercial power supply voltage changes when hot water is supplied.
[0005]
[Means for Solving the Problems]
Electric kettle according to the invention in order to solve this problem, a first heater connected through the first thyristor to a commercial power source, in parallel to the first heater is connected via a second thyristor and second and a heater, the first thyristor, a series connection of a second capacitor connected in parallel to the front side at both ends thereof a second diode, the second downstream side A series connection body of a first capacitor and a first diode connected in parallel to the capacitor, and a constant voltage element having an anode side connected to a midpoint of the first capacitor and the first diode at a gate thereof with the door, further connect the control circuit for energization control of the first thyristor to the first across the capacitor, constituted by connecting the motor to the second capacitor across, by the motor drive, the second S By energizing the lister, in which the first and the heater and a second heater connected in parallel and configured to secure the drive current of the motor.
[0006]
According to the present invention, a certain amount of hot water supply can be obtained no matter what the commercial power supply voltage is.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, first a first heater connected through the first thyristor to a commercial power source, which is connected via a second thyristor in parallel with the first heater and a second heater, the first thyristor includes a second capacitor connected in parallel to the front side at both ends a series connection of the second diode, to the second capacitor in the subsequent stage the first capacitor and the series connection of a first diode connected in parallel, and a constant voltage element is the anode is connected to the midpoint between the first capacitor and the first diode to the gate provided, further connected to a control circuit for energization control of the first thyristor to the first across the capacitor, constituted by connecting the motor to the second capacitor across, by the motor drive, the second thyristor Energize And in a first heater and an electric kettle having a structure to secure the driving current of the second parallel connection to the motor and heater, when it allo in connected thereto a commercial power supply voltage is what V, constant or The amount of hot water supply can be obtained.
[0008]
According to a second aspect of the present invention, there is provided an electric pot according to the first aspect, wherein a photothyristor is used as the second thyristor. The electric pot according to the first aspect includes a signal from a motor and a signal from a control circuit. The second thyristor can easily be controlled.
[0009]
Invention of Claim 3 of this invention provides the temperature sensor which detects the temperature of the to-be-heated object heated by a heater, a 1st heater, and a 2nd heater directly or indirectly, The electric pot according to claim 1, wherein the temperature sensor is connected to a control circuit, and the temperature of the object to be heated is controlled based on a signal from the temperature sensor, and the control is supplied from the first capacitor. The control circuit that operates stably with voltage can control the energization of the heater, and the first heater and / or the second heater can be controlled in multiple stages at the time of heat insulation. For example, a low temperature heat insulation mode is provided and the heater is energized. It can be raised to a set temperature when desired without any action, and has the effect of reducing the power during heat retention.
[0010]
The invention according to claim 4 of the present invention is characterized in that the amount of electric hot water supply can be varied in two stages by controlling the second thyristor based on a signal from a motor and / or a signal from a control circuit. It is an electric pot as described in any one of Claims 1-3, and has the effect | action that the amount of hot water supplies can be changed in multiple steps.
[0011]
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic circuit diagram showing a configuration of an electric pot in one embodiment of the present invention, and FIG. 2 is a characteristic diagram showing a relationship between a commercial power supply voltage and a hot water supply amount in the same embodiment. In FIG. 1, reference numeral 1 denotes an AC commercial power supply of, for example, 100 V, and a first heater 2 and a first bidirectional three-terminal thyristor (hereinafter referred to as a first thyristor) 3 are connected to the energization path. A series connection body of the second heater 12 and the second thyristor 13 is connected to the first heater 2 in parallel. The first thyristor 3 is connected in parallel with a series connection body of a capacitor 4 for control power and a diode 5. The capacitor 4 is connected to terminals a and e of the control circuit 6. A parallel body of a capacitor 24 and a relay 25 is connected to the preceding stage of the series connection body of the capacitor 4 and the diode 5, a parallel body of the motor 23 and the capacitor 27 is connected via the diode 26, and the diode 28 is further connected to the first heater. 2 is connected. 31 is a fuse.
[0012]
When boiling water, the switch 29 is turned on (the switch 29 may be turned on by a control circuit not shown), and the contact is turned on by the relay 25 to energize the boiling heater 22 at this time. The first and second heaters 2 and 12 are also energized, and thereby water is heated. When boiling occurs, the switch 29 is turned off (the switch 29 may be turned off by a control circuit not shown), the energization of the boiling heater 22 is cut off, and thereafter the first and second heaters for heat insulation are used. 2 and 12 is maintained.
[0013]
That is, the first and second heaters 2 and 12 are used to keep the object to be heated in the electric pot 21 warm, and the temperature of the object to be heated in the electric pot 21 is detected by the temperature sensor 8 including a negative characteristic thermistor. By transmitting to the control circuit 6 via the terminal b and controlling the energization of the first and second heaters 2 and 12 by the control circuit 6, the temperature of the object to be heated in the electric pot 21 is kept constant. It has become. Specifically, a Zener diode 9 as a constant voltage element and a control terminal c of the control circuit 6 are connected to the gate G of the first thyristor 3.
[0014]
Now, when the AC commercial power supply 1 is connected, the first heater 2 is energized, but the first thyristor 3 is in the positive half cycle until the first thyristor 3 rises from zero to 10V in the positive half cycle. During this time, the capacitors 4, 24, 27 are charged via the diodes 5, 26, 28. That is, since the Zener voltage of the Zener diode 9 is set to 10 V, the gate current of the first thyristor 3 does not flow until the AC voltage rises from zero to 10 V in the positive half cycle, and thus the first thyristor 3 During this period, the capacitors 4, 24 and 27 are charged, and the charging voltage of the capacitor 4 becomes the control voltage of the control circuit 6.
[0015]
Hot water is supplied by turning on the switch 30 and starting the motor 23. When the thyristor 13 is turned on via the resistor 14 by the signal of the motor 23, the heater 12 is connected in parallel with the heater 2 to determine the energization current to the motor 23 and the amount of hot water supply, but the AC commercial power supply 1 is 110V, 120V, If it is switched to 200V, 220V, and 240V, that is, if there is a voltage change due to the exporting country, the heater 2 only needs to be kept at a constant temperature, for example, if it is 56 W, the DC resistance of the heater 2 is 100V. It is about 200Ω, and at 240V, it is about 1kΩ. Since the current flowing through the motor 23 is determined by the DC resistance of the heater 2, the amount of hot water supply at that time has a characteristic of X as shown in FIG.
[0016]
By appropriately selecting the capacity of the heater 12 by connecting the series connection of the heater 12 and the thyristor 13 in parallel to the heater 2, even if the AC commercial power source 1 changes, the amount of hot water supply is made constant as shown by the Y characteristic in FIG. It can be done easily.
[0017]
The electric pot obtained as described above is advantageous in that a certain amount of hot water supply can be obtained even if the commercial power source changes.
[0018]
In the present embodiment, the second heater 12 is used as a means for changing the amount of hot water supply. However, the first heater 2 and / or the second heater 12 are controlled in multiple stages at the time of heat retention. If the temperature is raised to a predetermined temperature when desired without energizing the heater, the effect of the power saving mode can be obtained.
[0019]
Further, if the thyristor 13 is controlled by the signal from the motor 23 and / or the signal f of the control circuit 6, there is an effect that the amount of hot water supply can be made multistage.
[0020]
【The invention's effect】
As described above, in the electric pot according to the present invention, the first heater, the first thyristor interposed in the energization path, the second heater connected in parallel to the first heater, and the second thyristor are connected in series. By providing the body, it is possible to obtain a convenient effect for use in that a hot water supply amount of a certain level or more can be obtained with the same motor regardless of the commercial power supply voltage to be connected.
[Brief description of the drawings]
FIG. 1 is a circuit diagram showing a schematic configuration of an electric pot according to an embodiment of the present invention. FIG. 2 is a characteristic diagram showing a relationship between a commercial power supply voltage and electric hot water supply in the embodiment. Circuit diagram showing schematic configuration of pot [Explanation of symbols]
1 AC commercial power supply 2, 12, 22 Heater 3, 13 Thyristor 4, 24, 27 Capacitor 5, 26, 28 Diode 6 Control circuit 8 Temperature sensor 9 Zener diode 23 Motor

Claims (4)

It has a first heater which is connected via a first thyristor to a commercial power source, and a second heater is connected via a second thyristor in parallel to the first heater,
It said first thyristor, the second capacitor and the series connection of the second diode, a first capacitor connected in parallel with the second capacitor in the subsequent stage connected in parallel to the front side at both ends If a series connection of a first diode, and a constant-voltage element has an anode side connected to the midpoint between the first capacitor and the first diode to the gate, further said first capacitor across the first thyristor is connected to a control circuit for controlling energizing the, constituted by connecting the motor to the second capacitor across,
The motor drive, said by energizing the second thyristor, the first heater and the second configuration the electric kettle to a heater connected in parallel to ensure the driving current of the motor. The electric pot according to claim 1, wherein a photothyristor is used as the second thyristor. Heater and a first heater and, or a temperature directly of the heated object, or indirectly temperature sensor for detecting provided which is heated by the second heater, to connect the temperature sensor to the control circuit, the temperature The electric pot according to claim 1, wherein the temperature of the object to be heated is controlled based on a signal from the sensor. The amount of electric hot water supply can be varied in two stages by controlling the second thyristor based on a signal from a motor and / or a signal from a control circuit. The electric kettle described.

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