JPS62139292A - Heating cooker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heating cooker such as an induction heating cooker used in general households.

2. Description of the Related Art Conventionally, this type of heating cooker includes a temperature sensing element 1 that detects the temperature of a pot, a control circuit 2 that controls the heating amount, and a temperature sensing element 1 and a control circuit as shown in FIG. 2
The control circuit 2 includes a resistor 4, a transistor 6, a resistor 7, a DC power supply 6, a DC power supply 8, Consisting of a voltage comparator 9 and a display element 1o, the display element 1
0 is composed of a light emitting diode 11 and a resistor 12.

The temperature sensing element 1 uses a thermistor.

The operation in the above configuration will be explained. When the temperature sensing element 1 and the control circuit 2 are connected by the connector 3, that is, in a normal state, the base current of the transistor 6 flows through the resistor 4, so the connector current of the transistor 6 flows through the resistor 7, and the resistor 7 exceeds the voltage of DC power supply 8, the output of voltage comparator 9 falls to ground, and light emitting diode 11 lights up.

On the other hand, if the connector 3 is not connected due to assembly errors, etc. (temperature sensing element 1 and control circuit 2 are not connected), the transistor 6 is turned off and the resistor 7 is not connected. When the voltage becomes zero, the output of voltage comparator 3/7/9 becomes high and heating is stopped. Further, at this time, the light emitting diode 11 is turned off, indicating that the connector 3 is not connected.

Problems to be Solved by the Invention In such a conventional configuration, the thermistor of the temperature sensing element 1 has a very high resistance when the temperature is low, so the current flowing through the thermistor becomes very small.
The transistor 5 is necessary to determine whether the control circuit 2 and the control circuit 2 are connected. Therefore, there is a problem that the circuit becomes complicated accordingly, and there is also a possibility of malfunction depending on the fluctuation of the transistor 6.

Means for Solving the Problem In order to solve this problem, the heating cooker of the present invention includes a temperature sensing element, a control circuit that has a display element and a voltage comparator to control the amount of heating, and a control circuit that controls the amount of heating. 3 provided on the temperature sensing element side and the control circuit side that connect the sensing element and the control circuit.
The connector on the temperature sensing element side short-circuits two terminals, and the terminals of the connector on the control circuit side corresponding to the shorted two terminals are connected to the display element and the voltage comparator. is connected, the voltage of the display element is detected by a voltage comparator, and a signal to stop is generated.

According to this configuration, when the pair of connectors are not connected, no voltage is applied to the display element, so it can be known that the pair of connectors are not connected, and the voltage comparator It detects that no voltage is applied to the display element and stops heating.

EXAMPLES Hereinafter, examples of the present invention will be described with reference to the drawings. FIG. 1 is a circuit diagram of a heating cooker according to an embodiment of the present invention. In FIG. 1, 11 is a temperature detection element using a thermistor that detects the temperature of the pot, 12 is a control circuit that controls the amount of heating, and 13 is a side of the temperature detection element 11 that connects the temperature detection element 11 and the control circuit 12. This is a pair of connectors with three or more terminals provided on the control circuit 2 side. The connector 13 on the beso 11 side of the temperature sensing element 5 connects the temperature sensing element 11 and short-circuits the two terminals with 811 &. The control circuit 12 includes a display element 14 made up of a light emitting diode 15 and a resistor 16. DC power supply 17. DC power supply 18. It has a voltage comparator 19. The display element 14 and the voltage comparator 19 are connected to the terminals of the connector on the control circuit side that correspond to the short-circuited two terminals on the temperature sensing element 11 side.

In the above configuration, the operation will be described. When the pair of connectors 13 are connected, a voltage is applied to the display element 14 and the display element 14 lights up, and the output of the voltage comparator 19 becomes high and heats up. When a pair of connectors 13 are not connected, no voltage is applied to the display element 14 and the light is turned off to notify that the connectors 13 are not connected, and the voltage comparator 1
The output of 9 becomes low and heating is stopped.

In this embodiment, the connector terminals are short-circuited or opened depending on whether the pair of connectors 13 are connected or not, so the operation is very reliable, and the circuit is very simple since no transistors are required.

FIG. 2 is a circuit diagram of a heating cooker according to another embodiment of the present invention. In FIG. 2, 11 is a temperature detection element using a thermistor that detects the temperature of the pot, 12 is a control circuit that controls the amount of heating, and 13 is the temperature detection element 11 and the control circuit 12.
This is a pair of connectors having three or more terminals on the temperature sensing element 11 side and the control circuit 12 side. A connector 13 on the temperature sensing element 11 side connects the temperature sensing element 11 and short-circuits two terminals with a wire 11a. The control circuit 12 is
A display element 14 composed of a light emitting diode 15 and a resistor 16 indicating that the connector 13 is connected, and a DC power supply 1
7. DC power supply 18. A display element 20 consisting of a voltage comparator 19 and a light emitting diode 21 that indicates that the cooking device is heating. Switching element 22° diode 24 for controlling heating and stopping of the cooking device. Diode 25. It has a resistor 23. The voltage of the DC power supply 18 is higher than the operating voltage of the light emitting diode 21.

In the above configuration, the operation when the pair of connectors 13 are connected will be described.

7b/ When the switching element 22 is on, the display element 14
A voltage is applied to the display element 20, and heating is performed such that the point A becomes high.

When the switching element 22 is on, point A becomes low and heating is stopped, a voltage is applied to the display element 14, but no voltage is applied to the display element 20, and the cooking device is heated. is stopped.

Next, the operation when the pair of connectors 13 are not connected will be described. When the switching element 22 is on, point A becomes low and heating is stopped, voltage is applied to the display element 14, but no voltage is applied to the display element 2o and the cooking device stops. Indicates that When the switching element 22 is male, no voltage is applied to the display element 14, indicating that the pair of connectors 13 are not connected, and the voltage comparator 19 causes the point A to become low and stop. Since no voltage is applied to the display element 2o, it indicates that the cooking device is stopped.

In this embodiment, it is possible to control heating and stopping of the cooking device by the switching element 22, and it is possible to reliably stop the cooking device when the pair of connectors 13 are not connected. It is possible. In addition, the display element 2o allows users to know whether the cooking device is heating or not, and when the display element 14 turns off, it can be seen that the connector 13 is not connected.

In each of the embodiments, the connector 13 has four terminals, but it may have three terminals by making one terminal of the temperature sensing element 11 common to the negative terminal of the two short-circuited terminals.

As is clear from the effects of the invention, the heating cooker of the present invention includes a temperature sensing element, a control circuit that has a display element and a voltage comparator to control the amount of heating, and a temperature sensing element and a control circuit that controls the amount of heating. It has a pair of connectors with three or more terminals on the temperature sensing element side and the control circuit side that connect the control circuit, the connector on the temperature sensing element side shorts two terminals, and the control circuit side corresponds to the shorted two terminals. By connecting the display element and a voltage ratio 9-base comparator to the terminal of the connector, the voltage of the display element is detected by the voltage comparator, and a heating stop signal is generated. It is possible to reliably stop the heating cooker with a simple circuit when the connector is not connected, and it is possible to notify that the connector is not connected by the display element. Become. Therefore, a highly reliable heating cooker can be provided.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a heating cooker showing an embodiment of the present invention;
FIG. 2 is a circuit diagram of a heating cooker showing another embodiment of the present invention, and FIG. 3 is a circuit diagram of a heating cooker showing a conventional technique. 11... Temperature detection element, 12... Control circuit, 13... Connector, 14... Display element, 19... Voltage comparator . .

Claims (1)

[Claims] A temperature sensing element, a control circuit having a display element and a voltage comparator to control the amount of heating, and three or more terminals provided on the temperature sensing element side and the control circuit side to connect the temperature sensing element and the control circuit. having a pair of connectors, the connector on the temperature sensing element side shorts two terminals, and the display element and the voltage comparator are connected to the terminals of the connector on the control circuit side corresponding to the shorted two terminals, A heating cooker that detects the voltage of the display element with a voltage comparator and generates a heating stop signal.