JP2001043967A - High-frequency heating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wasteful power consumption by turning off a relay after the power is fed for a certain period regardless of heating in relation to a high-frequency heating device using an inverter power source. SOLUTION: This device is so structured that a period required for cooling an inverter power source 8 until it can output high power is calculated by the use of the output time of the inverter power source 8, the magnitude of its output and the temperature in a heating chamber 2 when a door 3 is closed, and a power feeding means 10a is turned off when the door 3 is not opened or there is no input from an operation part 4 within the calculated period. Therefore, the most suitable period until the power feeding means 10a is turned off can be set depending on the presence of heating, and wasteful consumption of power is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-frequency heating device using a microcomputer.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. Hei 7-217906, a power supply relay has been turned off after a certain period of time after a door is closed or heating is completed.

[0003]

In such a conventional microwave oven, however, the power supply relay is turned off after a certain period of time irrespective of the presence or absence of heating. Power is supplied for the same time as when heating is performed, and power is wasted.

[0004]

The present invention solves the above-mentioned problems by reducing the time required for the inverter power supply to cool until the inverter power supply can output a high output, depending on the inverter output time, the magnitude of the output, and the temperature of the heating chamber. After calculating and counting the calculated time, the power supply relay is turned off.

[0005] Thus, when there is no heating operation, the power supply can be turned off in a short time, so that useless power consumption can be suppressed.

When a heating operation is performed, the time required for the inverter power supply to cool until the inverter power supply can output a high output is measured based on the inverter output time, the magnitude of the output, and the temperature in the heating chamber, and then the power supply is turned off. Can be turned off. When the user again heats the food, the inverter power supply can output a high output, so that cooking can be performed in a short time.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is operated by a heating chamber for storing food, a door for opening and closing a food entrance to the heating chamber, an inverter power supply, and the inverter power supply. A high-frequency generator, a power supply that is supplied only when the door is in an open state, a control unit that outputs a control signal so as to perform a high output for a predetermined time in a high-frequency steady state and in a cold state, and supplies the power to the control unit. In a high-frequency heating device including a power supply unit and an operation unit for setting a cooking content and inputting a heating start instruction, when the door is closed, an inverter output time, a magnitude of the output, and a temperature in the heating chamber. Calculate the time required for the inverter power supply to cool until it can output a high output, and if the door is not opened within that time or there is no input from the operation unit, It is intended for turning off the source supply means.

[0008] Thus, when there is no heating operation, the power supply can be turned off in a short time, so that useless power consumption can be suppressed.

When the user again heats the food, the inverter power supply can output a high output, so that cooking can be performed in a short time.

[0010] According to a second aspect of the present invention, in addition to the first aspect of the present invention, a predetermined time is added to the time required for cooling the inverter power supply after the completion of the started cooking or at the time of cancellation.

In this way, when cooking is continued, it is possible to prevent the power from being turned off before the setting is continuously performed because the inverter cooling time is also short after the short cooking, and the next cooking can be prevented. Can be secured for a sufficient time.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) FIG. 1 is a configuration diagram of a high-frequency heating apparatus according to Embodiment 1 of the present invention.

In FIG. 1, reference numeral 1 denotes a main body of a high-frequency heating device, in which a heating chamber 2 made of a ferromagnetic material is provided. An opening 3 of the heating chamber 2 is provided with a door 3 which can be opened and closed so that foods in the heating chamber 2 can be taken in and out, and an operation section 4 for setting menus, cooking time and the like is provided on the front of the main body 1. And a display unit 5 for performing display.

FIG. 2 shows a control circuit according to the first embodiment of the present invention. Reference numeral 6 denotes a commercial power supply. The power supply 6 includes an interlock switch 7, an inverter power supply 8 capable of outputting a high output for a predetermined time in a steady output and in a cold state, a relay contact 9a of a main circuit contact, and power supply means. A relay contact 10a for turning on and off all loads and a fuse 11 as an overcurrent protection device are connected. A high frequency generator 12 operated by the inverter power supply 8 is connected to the inverter power supply 8, and the control unit 1 serving as a control unit
Reference numeral 3 denotes a configuration for controlling the output of the inverter power supply 8.

The control unit 13 further includes a step-down transformer 14 connected to a terminal opposite to the power supply 6 on the side of the relay contact 10a.
The control unit 13 includes a power supply circuit composed of a power supply stepped down by a step-down transformer 14, a microcomputer (hereinafter referred to as a microcomputer), and its peripheral circuits, and controls the entire microwave oven. Externally, an operation monitor 4, a relay 10, a relay 9, and an open monitor switch 15 which is turned off when the door 3 is opened and turned on when the door 3 is closed.
Is connected. The control unit 13 detects that the door 3 is closed with the open monitor switch 15 turned on.

The interlock switch 7 is of a bidirectional contact type, has a normally open contact terminal as a main circuit, and is connected to an inverter power supply 8. A relay contact 10a is provided in series between the power supply 6 and a common terminal of the interlock switch 7. The normally closed terminal of the interlock switch 7 is connected to the power supply 6 of the relay contact 10a. The interlock switch 7 is linked with opening and closing of the door 3 corresponding to the opening of the heating chamber. When the door 3 is closed, it turns on (the normally open contact terminal is closed). When the door 3 is open, it is turned off (the normally closed contact terminal is closed).

Next, the operation and operation will be described with reference to FIGS. FIG. 3 is a flowchart showing the control contents of the microcomputer. When the door 3 for opening and closing the heating chamber is opened, the commercial power supply 6 is supplied to the step-down transformer 14 via the normally closed contact terminal of the interlock switch 7 and the common terminal, and the control unit 13 is started ("start"). And the control unit 1
3 gives an operation signal to the relay 10 (processing step S
1). When an operation signal is applied to the relay 10, the relay contact 10a is turned on, and a power supply path to the step-down transformer 14 is formed. Therefore, after this, even if the user closes the door 3, the control unit 13 determines that the state is the cooking setting state or the operation state, calculates the relay energizing time by a method described later (processing step S <b> 2), and sets the relay energizing time only for the relay energizing time. 10. The user can continue to operate (processing step S3), during which the user can set and start cooking conditions.

When the control unit 13 detects that the door 3 is closed (processing step S4), a cooking condition is set by the operation unit 4 and a start operation is performed (processing step S5). The unit 13 gives an operation signal to the relay 9 and performs cooking control (processing step S8). When an operation signal is given to the relay 9, the contact 9a is turned on, and the inverter power supply 8 is energized. Then, the control unit 13 gives a control signal to the inverter power supply 8 so as to output an output corresponding to the cooking condition. The inverter power supply 8 inputs an output corresponding to the control signal to the high frequency generator 12, and as a result, a high frequency radio wave is supplied from the high frequency generator 12 to the heating chamber 2.

The output that can be output by this type of inverter power supply 8 changes depending on the cooling state of the inverter power supply 8, and outputs a normal output when the inverter power supply 8 is cold, that is, a high output that is higher than the maximum output that can be output regardless of the cooling state for a certain period of time. I can do it. Therefore, in order to quickly heat the food, in the cold state, the control unit 13 gives a control signal to the inverter power supply 8 so as to output a high output for a predetermined time immediately after the start, and outputs the output when the predetermined time is reached. Is supplied to the inverter power supply 8 so as to drop the power.

Further, after the inverter power supply 8 stops the output (processing step S9), the control unit 13 determines the time from when the inverter power supply 8 is cooled to when it can output a high output again, to the output time and the magnitude of the output. And a correction based on the temperature in the heating chamber is calculated (processing step S1).
0), the operation signal is continuously supplied to the relay 10 for the calculated time. In the meantime, the microcomputer calculates the above-mentioned calculation time by the microcomputer built in the control unit 13, and there is no further key setting such as cooking conditions by the user or the operation of the door 3, and after the count is completed (processing step S6), the control unit Numeral 13 stops the operation signal of the relay 10 (processing step S7), turns off the relay contact 10a, and enters a standby state.

FIG. 4 shows a flowchart of the relay energizing time calculation section. First, as a provisional value of the relay energizing time, the energizing time of the inverter power supply 8 is multiplied by the magnitude of the output, and further multiplied by a weighting constant m (processing step S11). The constant of the weight m is set to the inverter power supply 8
Is an arbitrary value that is set in consideration of the time required for cooling. Next, the relay energizing time is calculated by adding the value obtained by multiplying the temperature in the heating chamber by the weighting constant n and the temporary value of the relay energizing time calculated previously.

When the user further sets the cooking conditions or operates the door 3, the above-described calculation time is counted again.
3 stops the operation signal of the relay 10 and its relay contact 1
0a is turned off, and a standby state is set.

Further, when the door 3 is opened and the control unit 13 is activated, the inverter power supply 8 is already in a cold state. It can be controlled to output.

According to this embodiment, the time when the inverter power supply 8 is in the cold state is calculated from the inverter output time and the magnitude of the output, and the temperature in the heating chamber. In this case, since the output time is short and the temperature in the heating chamber is low, the cooling time of the inverter power supply 8 at this time is short. At this time, the power can be turned off in a short time, and unnecessary power consumption can be reduced.

Although only a relay has been described as the power supply means, the present invention can be implemented using a semiconductor device such as a triac.

(Embodiment 2) FIG. 5 is a flowchart showing a relay energizing time calculating section according to Embodiment 2 of the present invention. The configuration of the second embodiment is the same as that of the first embodiment, and only the control content of the microcomputer is different. That is, the flowchart showing the control contents of the microcomputer is the same as that of the first embodiment shown in FIG. 3, but is different from the flowchart of the relay energization time calculation unit of the first embodiment shown in FIG. As shown in the flowchart of the relay energizing time calculation unit of No. 5, after the processing step S12, a processing step 13 of "adding a fixed time to the relay energizing time" is added,
Others are the same as the first embodiment.

When cooking is normally continued, the inverter cooling time is short after a short cooking time.
After cooking for a short time, the power was turned off before setting was continued, but in this embodiment, a processing step 13 of “adding a certain time to the relay energizing time” has been added,
Even after cooking for a short time, a sufficient time for setting the next cooking can be secured.

As described above, the relay energizing time after cooking for a short period of time can secure not only the time during which the inverter power supply 8 is sufficiently cooled but also a time sufficient to continue setting of cooking. it can.

[0030]

As described above, according to the high frequency heating apparatus of the first aspect of the present invention, the time when the inverter power supply is in the cold state is determined based on the inverter output time, the magnitude of the output, and the temperature in the heating chamber. By calculating and counting the calculated time, the power supply can be turned off, so that if the user cooks for a short time, the power can be turned off in a short time after that. In addition, power consumption can be reduced.

When the control unit is started by opening the door, the inverter power supply is in a cold state. Therefore, in the first cooking, a higher output can be always output than the inverter power supply. Therefore, it is possible to provide an easy-to-use high-frequency heating device capable of quickly heating a heated object.

According to the high-frequency heating device of the second aspect,
Even after cooking for a short time, the relay energizing time can secure a time sufficient for setting to continue cooking, in addition to the time when the inverter power supply 8 is sufficiently cooled.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a high-frequency heating device according to a first embodiment of the present invention.

FIG. 2 is a control circuit diagram of the high-frequency heating device.

FIG. 3 is a flowchart showing control contents of a microcomputer of the high-frequency heating device.

FIG. 4 is a flowchart showing a relay energizing time calculation unit of the high-frequency heating device.

FIG. 5 is a flowchart illustrating a relay energizing time calculation unit of the high-frequency heating device according to the second embodiment of the present invention.

[Explanation of symbols]

 2 Heating room 3 Door 4 Operation unit 6 Power supply 8 Inverter power supply 10a Relay contact (power supply means) 12 High frequency generator 13 Control unit (control means)

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[Procedure amendment]

[Submission date] April 5, 2000 (200.4.5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction contents]

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is operated by a heating chamber for storing food, a door for opening and closing a food entrance to the heating chamber, an inverter power supply, and the inverter power supply. A high-frequency generator, a power supply that is supplied only when the door is in an open state, a control unit that outputs a control signal so as to perform a high output for a predetermined time in a high-frequency steady state and in a cold state, and supplies the power to the control unit. In a high-frequency heating device including a power supply unit and an operation unit for setting cooking content and inputting a heating start instruction, when the door is closed, the inverter output time and the magnitude of the output are reduced.
And the result of measurement of the temperature in the heating chamber, etc., calculate the time required for the inverter power supply to cool until it can output a high output, and within that time the door is not opened or there is no input from the operation unit. In this case, the power supply means is turned off.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0025

[Correction method] Change

[Correction contents]

Further, according to the present embodiment, the time during which the inverter power supply 8 is in the cold state is calculated from the inverter output time, the magnitude of the output, and the measurement result of the temperature in the heating chamber. When the cooking is performed, the output time is short and the temperature of the heating chamber is low, so that the cooling time of the inverter power supply 8 at this time is short. At this time, the power can be turned off in a short time, and unnecessary power consumption can be reduced.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H05B 6/64 H05B 6/64 FF term (Reference) 3K086 AA03 AA08 BA08 BB03 BB08 CB02 CB04 CD04 CD19 DA13 DB02 DB11 DB17 EA04 3K090 AA02 AA03 AB02 BA01 BB01 EB02 EB10 EB11 EB16 EB32 3L086 AA01 CA04 CB10 CC03 CC07 CC10 CC12 CC13 CC14 DA24 DA27 DA29

Claims (2)

[Claims] 1. A heating chamber for storing food, a door for opening and closing a food entrance to the heating chamber, an inverter power supply, a high frequency generator operated by the inverter power supply, and when the door is open. Only the power is supplied, a control means for outputting a control signal to perform a high output for a predetermined time in a high frequency steady state and in a cold state, a power supply means for supplying the power to the control means, a cooking content is set, and heating is performed. A high-frequency heating device including an operation unit for inputting a start instruction, wherein when the door is closed, the inverter is cooled until the inverter power supply can output a high output depending on the inverter output time, the magnitude of the output, and the temperature of the heating chamber. High-frequency heating that turns off the power supply means when the door is not opened or there is no input from the operation unit within that time. Location. 2. The high-frequency heating apparatus according to claim 1, wherein a fixed time is added to a time required for cooling the inverter power supply after the completion of the started cooking or at the time of cancellation.