JPH08330062A - Heating device - Google Patents

Abstract

PURPOSE: To shorten the repair time by increasing or decreasing the number of illuminated light emitting elements in response to the size of the displayed output, blinking at least one of them, and displaying the failure content in binary digits with the remaining light emitting elements. CONSTITUTION: A cooking pot to be heated is mounted on the mount plate of a main body 1, a power source is turned on by a power-on switch 7b, and the output is adjusted by a slide volume 7a. A number of LEDs corresponding to the set output within the LED group 8 of an output display section are lighted by a display controller 21, and the set output value is displayed. An output controller 17 turns on or off a power transistor Tr 14 at a certain frequency, an inverter circuit 11 generates a high-frequency current, and a heating coil 12 generates high-frequency magnetic field. The output controller 17 detects the on or off-timing based on the voltage across the heating coil 12, turns on or off the transistor Tr 14, and induction-heats the cooking pot with the corresponding magnetic field. The power-off switch 7c of an operation section 2 is operated to cut off the power source, and the heating is finished.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating device such as an induction heating cooker.

[0002]

2. Description of the Related Art A heating device of this type is disclosed, for example, in Japanese Patent Laid-Open No.
No. 68221.

This is a heating means for heating food,
A display unit that displays the contents of heating, a key input unit that executes the heating, a failure detection unit that detects a failure, and the heating unit and the display unit by inputting outputs from the key input unit and the failure detection unit. And a control unit for controlling the, the control unit has a failure state storage unit for storing the output from the failure detection unit, by determining the abnormality by inputting the output from the failure detection unit, The heating means is turned off, the display unit is returned to the initial state, and the cause of failure is displayed on the display unit by a specific operation from the key input unit.

In addition to the above, there is also a device in which, when a failure occurs, the details of the failure are displayed on the display section without any operation of the key input section.

[0005]

However, when the heating device fails, the user cannot determine whether the cause of the heating operation stop is a failure or a mere malfunction if the failure content cannot be understood unless a specific operation is performed. .

Therefore, if a failure occurs, it is considered that the failure content is generated on the display unit without any operation.
The mere display does not tell the user whether or not there is a malfunction.

[0007] Further, since the service person usually does not repair one type of heating device but repairs a large number of home electric appliances, he / she must repair the malfunction while checking the manual. become.

At this time, since the failure content displayed on the display unit is generally displayed as a symbol or an abbreviation instead of being transmitted in a sentence, the displayed content and the specific failure content are manually checked and then Move to repair work. The place where this failure content is displayed cannot be found immediately by simply displaying it on the display unit, and it may take time and effort at the initial stage of the failure repair, resulting in a long repair time.

The present invention solves such a problem.

[0010]

According to a first aspect of the present invention, there is provided a heating source for heating an object to be heated, an output setting section for setting an output of the heating source, and setting of the output setting section. A display control unit that displays an output or a heating output of the heating source on an output display unit including a plurality of light emitting elements, and an output control unit that controls the heating source by a set output of the output setting unit, A failure detection unit that detects the occurrence of a failure in the output control unit and the like, and when the failure detection unit detects a failure, the operation of the output control unit is stopped and the cause of the failure is displayed on the output display unit. The display control unit increases or decreases the number of emitted light according to the magnitude of the output to be displayed when the setting output or the heating output is displayed, and the failure of the light emitting element is displayed when the failure is displayed. Blink one even without a structure for displaying the failure contents in binary in the rest of the light emitting element.

According to a second aspect of the present invention, in the heating device according to the first aspect, the plurality of light emitting elements of the output display section are arranged in a line, and the display control section is
The light emitting elements at one end of the light emitting elements arranged in a line are blinked, and the details of the failure are displayed on the light emitting element next to the light emitting element.

[0012]

According to the first aspect of the invention, by blinking the output display section, the user is notified of the failure, and the failure content is also displayed, so that the service person can immediately start repair work. The repair time can be shortened.

According to the second aspect of the invention, since the details of the failure are displayed on the light emitting element adjacent to the blinking light emitting element, when the service person confirms the details of the failure, it is immediately displayed. The location can be confirmed and the repair work can be performed smoothly.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 is a main body of a heating cooker having a ceramic placing plate 1a on which a pot or a frying pan to be heated is placed, 2 is an operating portion, 3 is the operating portion and the cooking device. A control signal cable connecting to the main body 1 is a power cord for supplying power to the main body 1 of the cooking device, and 5 is an intake hole for taking in cooling air into the main body 1 of the cooking device.

The operation unit 2 includes a power LED 6 for indicating whether or not the power is turned on by turning on and off, an output setting unit 7 for setting a heating output desired by the user, and the output setting unit 7. The output display LED group 8 serving as an output display unit for displaying the set heating output. The operation unit 2 also includes a display control unit, which will be described later, that controls the display of the output display LED group 8.

The output setting unit 7 has an output setting slide volume 7a, a power-on switch 7b, and a power-off switch 7c.

The output display LED group 8 is formed by arranging LEDs 8a, 8b, 8c, 8d, and 8e, which are light emitting elements, side by side in a row. As the heating output to be displayed increases, the LEDs 8a are sequentially output. The number corresponding to the size of the lights is displayed. For example, when the minimum output is 200 W, only 8a is turned on, and when 400 W is displayed, the LEDs 8a and 8b are turned on, so that one LED is turned on every 200W increase.

In FIG. 2, 9 is a diode bridge for rectifying a commercial power source, 10 is a smoothing capacitor for smoothing the output of the diode bridge 9, and 11 is an inverter circuit for converting the frequency of the commercial power source into a high frequency.

The inverter circuit 11 includes a heating coil 12, which serves as a heating source for generating a high-frequency magnetic field and inductively heating a nearby pot, a resonance capacitor 13 connected in series with the heating coil 12, and the resonance capacitor. It has a power transistor 14 connected in parallel with 13 and a flywheel diode 15 connected in parallel with the power transistor 14 and having its anode side connected to the collector.

The heating coil 12 and the resonance capacitor 13
The series circuit of and is connected in parallel to the smoothing capacitor 10. Further, the heating coil 12 is arranged below the placing plate 1a.

Reference numeral 16 denotes a control device which detects the on-timing of the power transistor 14 from the voltage across the heating coil 12 and outputs an on-signal to the power transistor 14 for a time corresponding to the set output from the output setting section 7. Output control section 17 for heating operation, failure detection section 18 for detecting conduction breakdown of power transistor 14, and when the failure detection section 18 detects a failure, operation of output control section 17 is stopped and output display is performed. It has a failure handling unit 19 for instructing a failure display on the LED group 8.

Reference numeral 20 is a current transformer for detecting an input current to the inverter circuit 11, reference numeral 21 is a built-in operation portion 2, and a display control portion for performing display control of the output display LED group 8,
A thermistor 22 detects the temperature of the heating coil 12.

The operation of such a configuration will be described below. Usually, a cooking pot to be heated is placed on the placing plate 1a of the main body 1,
After the power is turned on with the power-on switch 7b and the output is set with the slide volume 7a, the output display LED group 8
Then, the display control unit 21 sets the number of L's according to the set output.
The ED is turned on and the set output value is displayed.

Further, the output control section 17 turns the power transistor 14 on and off at a certain frequency to generate a high frequency current in the inverter circuit 11, and the high frequency current causes the heating coil 12 to generate a high frequency magnetic field. This high-frequency magnetic field causes the pot on the mounting plate 1a to be induction-heated.

Here, the output control unit 17 includes the heating coil 1
2 detects the on-timing of the power transistor 14 from the voltage across both ends of the power transistor 14, outputs an on-signal for a time corresponding to the set output to the power transistor 14 to turn on the power transistor 14, and then turns off the power transistor 14. It waits in this state until the on timing of is detected. By repeating this operation, the power transistor 1
4 is turned on and off.

When the heating operation is finished, it can be finished by operating the power-off switch 7c of the operation unit 2 to cut off the power supply.

Next, the operation will be described by taking as an example a failure when the failure detecting section 18 detects a failure and the thermistor 22 is disconnected.

When the thermistor 22 is broken, a temperature outside the normally assumed temperature range is detected.
When the failure detection unit 18 detects that the temperature detected by the thermistor 22 is out of this temperature range, the failure response unit 19 determines that the thermistor disconnection failure has occurred in the heating coil 12.

When the failure handling section 19 determines that there is a failure, it first stops the operation of the output control section 17 to stop the ON signal to the power transistor 14. And
The display control unit 21 is instructed to display a failure and the details of the failure are output.

When the failure display is instructed, the display control section 21 blinks the LED 8e of the output display LED group 8 and displays the failure details in the other LEDs 8a to 8d in a binary system. Since this failure corresponds to the failure of No. 4 in the failure correspondence table of FIG. 3, only the LED 8c is turned on and 4 is displayed in the binary system. In FIG. 3, ○ indicates that the LED is off, ● indicates that the LED is on, and ◎ indicates that the LED is blinking.

The user sees the LED 8e blinking and immediately determines that there is a failure, and calls a service person. The serviceman confirms that the inverter circuit temperature detection circuit is abnormal by comparing the lit LEDs 8a and 8b next to the blinking LED 8e with the failure correspondence table of FIG.

At this time, since the service person is turning on the LED 8e, he / she can immediately pay attention to the LED 8e and immediately notice the failure content display displayed next to it.

Then, the serviceman repairs based on the repair work determined by the manual.

In the present invention, the set output is displayed by the output display LED group 8. However, the heating output of the induction heating coil 12 may be displayed.

Although the embodiments of the present invention have been described above by taking the induction heating cooker as an example, the present invention is not limited to induction heating cookers, and heating cookers such as halogen heater cookers and electric heater cookers, Alternatively, it can be applied to all heating and drying devices used for drying grains and sewage in a simple toilet.

[0036]

According to the present invention, it is possible to accurately inform the user that the heating device is out of order, and
The service person can be notified at a glance where the details of the failure are displayed, and the repair time can be shortened.

[Brief description of drawings]

FIG. 1 is an external view of a heating cooker according to the present invention.

FIG. 2 is a control circuit diagram of the heating cooker according to the present invention.

FIG. 3 is a failure correspondence table in which the failure content display of the output display LED group and the failure content are associated with each other.

[Explanation of symbols]

 1 Heating Cooker Main Body 7 Output Setting Section 8 Output Display LED Group 12 Heating Coil 17 Output Control Section 18 Failure Detection Section 19 Failure Response Section 21 Display Control Section

Claims (2)

[Claims] 1. A heating source for heating an object to be heated, an output setting section for setting an output of the heating source, and a setting output of the output setting section or a heating output of the heating source includes a plurality of light emitting elements. A failure that detects that a failure has occurred in the output control unit or the like in a display control unit that displays on the output display unit and an output control unit that controls the heating source by the set output of the output setting unit The display control unit includes a detection unit and a failure response unit that causes the output display unit to display the cause of the failure while stopping the operation of the output control unit when a failure occurrence is detected by the failure detection unit. When the set output or the heating output is displayed, the number of emitted light is increased / decreased according to the magnitude of the output to be displayed, and at the time of the failure display, at least one of the light emitting elements is blinked, and the remaining light emitting elements have the failure content. The heating device is characterized by displaying in binary. 2. The plurality of light emitting elements of the output display section are arranged in a line, and the display control section blinks a light emitting element at one end of the light emitting elements arranged in a line when a failure is displayed. The heating device according to claim 1, wherein the details of the failure are displayed on the light emitting element adjacent to the heating element.