JP2001292897A - Cooker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooker by which required control is performed regardlessly of the opening/closing state of a power source switch. SOLUTION: The cooker is provided with an input voltage detecting means 17 for detecting an input voltage to an inverter circuit 33 and a power source switch state detecting means 19 for detecting the on/off state of the power source switch 2 based on a signal inputted from the means 17 so that a configuration is obtained, where the output of a control power source part 6 for generating a DC voltage is made to be the operation power source of a control means 16 regardless of the state of the power source switch 2. Then, even in such a configuration, the control means 16 detects the off of the power source switch 2 based on the signal inputted from the power source state detecting means 19, stops the driving of an induction heating part 3 and a roaster heating part 7 and prevents the reception of an input signal from an input means 9.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooking device used in ordinary households.

[0002]

2. Description of the Related Art In recent years, a composite heating cooker has been developed in which a heating coil for inducing an eddy current in a load pan by a high-frequency magnetic field to heat it and a heat source such as a halogen heater or a sheath heater are housed in the same main body. I have. These are equipped with various safety-related functions, such as a function to display that the top plate is in a high-temperature state during cooking immediately after the power switch is turned off, and a function to display the inside of the main body after heating is completed. In order to prevent a sudden rise in temperature, the cooling fan is continuously driven until the temperature becomes lower than a predetermined temperature.

FIG. 9 shows a conventional heating cooker.
This will be described with reference to FIG. FIG. 9 is a view showing a heating cooker having a conventional configuration. In FIG. 9, 1 is an AC power supply, 2 is a power switch, 3 is an induction heating unit, and includes a rectifier 30 and a heating coil 3.
1, switching element 32, and inverter circuit 33
The switching element 32 is opened and closed, and a high-frequency current of several tens of KHz is applied to the heating coil 31 to inductively heat the load pan 4 magnetically coupled to the heating coil 31. One end of the input of the induction heating unit 3 is connected to the AC power supply 1 via the power switch 2, and the other end of the input of the induction heating unit 3 is directly connected to the other end of the AC power supply 1. Reference numeral 5 denotes a top plate on which the load pan 4 is loaded, and is located between the heating coil 31 and the load pan 4.

Reference numeral 6 denotes a control power supply unit which receives a DC voltage of 20 V input from an AC power supply 1 via a power switch 2 (hereinafter referred to as VD1).
The first power supply circuit 61 outputs a DC voltage of 5 V input from the first power supply circuit 61 (hereinafter referred to as VD2).
, And a third power supply circuit 63 directly input from the AC power supply 1 and outputting a DC voltage of 12 V (hereinafter referred to as VD3).

A roaster heating unit 7 includes a heater 71 and a relay 72 for controlling the energization of the AC power supply 1, and a relay drive circuit 73 for opening and closing the contacts of the relay 72. The heater 71 is closed by closing the contacts of the relay 72. And the AC power supply 1 is energized to heat the roaster storage and perform cooking such as grilling of fish.

Reference numeral 8 denotes a display unit, which is a light emitting diode (hereinafter referred to as an LED)
, Etc.), a high temperature display means 81 for displaying that the top plate 5 is in a high temperature state, a power switch state display means 82 for displaying the open / close state of the power switch 2, and an output state of the induction heating unit 3. , And a roaster heating section display means 84 for displaying the output state of the roaster heating section 7.

Reference numeral 9 denotes input means for inputting settings such as the output of the induction heating unit 3 or the roaster heating unit 7. Reference numeral 10 denotes a first temperature sensing element, which is disposed below the top plate 5 and has a loading pot 4.
Is detected indirectly, and the temperature of the top plate 5 is directly detected. Reference numeral 11 denotes a high-temperature display drive unit, which includes a comparator IC111, transistors Q111 and Q112,
The temperature of the top plate 5 is set to a predetermined temperature (about 65 ° C.) based on an input from the first temperature sensing element 10.
C.) or higher, the transistor Q111 is turned on, and the transistor Q112 is turned on to turn on the LED 81, which is a component of the high temperature display means 81. Note that the high-temperature display drive unit 11 is a pulse circuit 1 that outputs “L” at a predetermined cycle.
11, the transistor Q112 is forcibly turned off at a predetermined cycle, and when both the induction heating unit 3 and the roaster heating unit 7 stop heating, the LED 81 is turned on at a predetermined cycle by the above-described operation. Flashing.

Reference numeral 12 denotes a fan motor which is a component of a cooling fan for cooling the switching element 32 and the like, 13 denotes a fan motor drive unit comprising the fan motor 12 and a phototriac IC 131 for controlling the energization of the AC power supply 1, and the like.
Reference numeral 14 denotes a second temperature sensing element which is provided near the roaster compartment and detects the temperature in the roaster compartment. Reference numeral 15 denotes a fan motor drive detection section, and the inside of the roaster compartment is controlled based on an input from the second temperature sensing element 14. If the temperature is equal to or higher than a predetermined temperature (about 90 ° C.), a fan motor ON signal is output to the fan motor drive unit 13 to drive the fan motor 12. Further, the fan motor drive detection unit 15 incorporates the timer means 151,
The output of the fan motor ON signal is stopped when a predetermined time (10 minutes) or more has elapsed, and the maximum drive time of the fan motor 12 is set to the predetermined time. The timer means 151 has a reset input. When a predetermined signal is input, the timer means 151 can reset the time measurement and newly measure the predetermined time.

Reference numeral 16 denotes a control means for integrally controlling the above-described constituent means, which is constituted by a microcomputer, a comparator, etc., and controls the induction heating section 3 and the roaster heating section 7 based on an input signal from the input means 9. The output is controlled, and the display unit 8 is controlled to control the induction heating unit 3 and the roaster heating unit 7.
Is output, the fan motor drive unit 13 is controlled via the diode D131 to drive the fan motor 12, a reset signal is output to the timer means 151, and the pulse circuit 111 in the high temperature display drive unit 11 is constantly turned on. When the first temperature sensing element 10 detects a high temperature of the top plate 5 when either the induction heating section 3 or the roaster heating section 7 is heated by controlling the output to be an open output, the LED 81 is turned on.
Is lit.

The control means 16 includes an LED 82 which is a component of the power switch state display means 82 during operation.
Lights up. That is, when the power switch 2 is on, VD1 and VD2 are output from the control power unit 6 and the control unit 16 operates to turn on the LED 82. However, when the power switch 2 is off, the control power unit 6 outputs VD1 and VD.
When D2 is not output, the control means 16 stops operating and L
The ED 82 turns off. With this operation, the on / off state of the power switch 2 is displayed on the power switch state display means 82.

The control means 16 sets a standby mode in which the driving of the induction heating section 3 and the roaster heating section 7 is stopped and waits for a signal indicating the start of heating from the input means 9 to be inputted, and a seven-step output setting. And an IH heating mode in which any one of the seven-stage output settings is selected based on a signal input from the input means 9 to control the output of the induction heating unit 3 and a six-stage output setting. There are a plurality of operation modes such as a roaster mode in which an arbitrary one of the above-described six-stage output settings is selected based on a signal input from the means 9 and the relay 72 of the roaster heating unit 7 is on / off controlled.

Then, the high temperature display means 81, the first temperature sensing element 10, the high temperature display drive section 11, the fan motor drive section 1
3, the second temperature sensing element 14 and the fan motor drive detection unit 15 use VD3, which is the output of the third power supply circuit 63, as an operation power supply to enable operation even when the power switch 2 is off. Even when the switch 2 is off, when the top plate 5 is in a high temperature state, the fact is indicated by the high temperature display means 81 to prevent a user of the device from accidentally touching the top plate 5 and getting burned, When the roaster heating unit 7 has been driven until just before and the inside of the roaster compartment is in a high temperature state, the fan motor 12 is driven to prevent the ambient temperature inside the device from rising due to radiant heat from inside the roaster compartment, the switching element 32 and the like. Is heat-resistant.

Further, the other constituent means indicates to the user of the equipment that the equipment cannot be used when the power switch 2 is turned off. The output VD1 or the output VD2 of the second power supply circuit 62 is used as an operation power supply, and is not operated when the power switch 2 is off.

[0014]

However, in the above-described conventional configuration, the first power supply circuit 61 and the second power supply circuit 62 that can operate as a power supply only when the power switch 2 is turned on, and the state of the power switch 2 Regardless, like the third power supply circuit 63 operable as a power supply, two power supply means are required, which complicates the device configuration, increases the number of parts, and increases the cost. Also, in order to solve the above problems,
The third power supply means 63 supplies all the operation power of the above-mentioned constituent means.
By simply inputting from a power source that can be a power source irrespective of the state of the power switch 2, the control means 16 and the display unit 8 operate even when the power switch 2 is off.
Although the power supply to the AC power supply 1 and the induction heating unit 3 and the roaster heating unit 7 is cut off and heating is impossible, the device operates as a device and is inconvenient. Further, if the power switch 2 is changed from off to on when the operation mode of the control means 16 is in the IH heating mode or the roaster mode, the induction heating unit 3 or the roaster heating unit 7 is driven immediately after the power switch 2 is turned on. It is a danger. Further, if all the operation powers of the above-mentioned constituent means are inputted from a power supply such as the first power supply circuit 61 or the second power supply circuit 62 which can only be the power supply when the power supply switch 2 is ON, the power supply switch 2 When the high temperature display means 81 and the fan motor 12
Cannot be driven, and the user of the device may be burned by touching the top plate 5 or the temperature inside the device may be excessively increased and the switching element 32 or the like may be damaged by heat. there were.

The present invention solves the above-mentioned conventional problem, and has a configuration in which only a power supply circuit that outputs a predetermined voltage regardless of the state of the power switch 2 is used as an operation source, and a display is performed even when the power switch 2 is off. Part 8 or fan motor 12
When the power switch 2 is turned off, the control unit 16 stops driving the induction heating unit 3 and the roaster heating unit 7 and inhibits the input unit 9 from accepting.
When the power switch 2 is changed from off to on, the control means 1
The object 6 is to shift to the standby mode and enable the input means 9 to be accepted.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a power switch, a heating unit connected to a power supply via the power switch, and a voltage irrespective of the open / closed state of the power switch. A control power supply unit for outputting, and input voltage detection means for detecting a magnitude of an input voltage of the heating unit,
Power switch state detection means for detecting the open / closed state of the power switch based on a signal input from the input voltage detection means, and control means for controlling an output of the heating unit using an output voltage of the control power supply unit as an operation source. When the control unit detects that the power switch is in an open state based on a signal input from the power switch state detection unit, the control unit sets at least an off mode in which the driving of the heating unit is stopped and a heating command is not received. When detecting that the power switch is changed from the open state to the closed state based on a signal input from the power switch state detecting means, at least the driving of the heating unit is stopped and a standby mode for waiting for a heating command is set. is there.

[0017]

According to the first aspect of the present invention, there is provided a control power supply unit for outputting a voltage irrespective of an open / closed state of a power switch, an input voltage detecting means for detecting an input voltage of a heating unit,
Power switch state detection means for detecting an open / close state of the power switch based on a signal input from the input voltage detection means, wherein the control means uses an output voltage of the control power supply as an operation source, and the power switch state detection means When the power switch is detected to be in an open state based on a signal input from the controller, at least the driving of the heating unit is stopped and an off mode in which a heating command is not received is set, and a signal input from the power switch state detection unit is set. When detecting that the power switch is changed from the open state to the closed state based on the power switch, at least the driving of the heating unit is stopped and a standby mode for waiting for a heating command is set. It has a control power supply section that outputs power, so that it can supply power to the control means and operate it even when the power switch is open. Are possible, the control means may drive the display unit or a fan motor or the like. Further, the power switch state detecting means detects the open / close state of the power switch based on the signal input from the input voltage detecting means and outputs a signal, and the control means inputs the signal. Can be detected. When the power switch is in the open state, the control unit sets the off mode to stop driving the heating unit, and when the power switch changes from the open state to the closed state, sets the standby mode to stop driving the heating unit. While waiting for the heating command, the user of the equipment can clear the operation mode of the control means only by operating the power switch, and conversely, if the power switch is turned on from off to on, the heating unit is driven However, the safety of the device can be improved.

According to a second aspect of the present invention, there is provided a display unit for displaying at least a heating state of the heating unit, and the control means stops driving of at least a part of the display unit when the off mode is set. Yes, when the power switch is open, the control means turns on a display related to the output of the heating unit and turns on the heating unit by heating a predetermined display such as a display for calling attention to a user of the device. It is possible to clearly indicate that the device is in an impossible state, reduce the current required for driving the display unit, and suppress power consumption when the device is not used.

According to a third aspect of the present invention, the display unit includes a power switch state display means for displaying an open / closed state of the power switch, and the control means outputs a signal input from the power switch state detection means. For example, the control means turns on the power switch status display means when the power switch is closed, and turns off the power switch status display means when the power switch is open. This allows the user of the device to recognize at a glance the power switch open / close state on the power switch state display means without delay.

According to a fourth aspect of the present invention, the control means stores and holds the latest operation state such as the output of the heating section when the power switch is closed, and the power switch is changed from the closed state to the open state. When it is detected that the power switch changes from the open state to the closed state within a predetermined time after detecting that the power supply has changed, the output and the like of the heating unit are controlled based on the operation state stored and held. Yes, even if the power switch shifts from the closed state to the open state and returns to the closed state again within a predetermined time, the control means controls the output of the heating unit based on the operating state stored and held. It is possible to prevent the operation state of the device from being changed by opening and closing the power switch within a period of time, and to prevent malfunction when opening and closing the power switch or malfunction by touching the power switch for a short time.

[0021]

(Embodiment 1) A first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a view showing a heating cooker according to a first embodiment of the present invention. In addition,
In the present embodiment, components having the same functions as those of the conventional example shown in FIG. The characteristic configuration of this embodiment is as follows. First, the control power supply unit 6
Directly from the AC power supply 1 without passing through the power switch 2 to output a DC voltage of 20 V (hereinafter referred to as VD1).
And a second power supply circuit 62 that receives a DC voltage of 5 V (hereinafter referred to as VD2) from the first power supply circuit 61. An input voltage detecting means 17 for detecting an input voltage to the inverter circuit 33 and outputting an analog signal corresponding to the detected voltage; a zero voltage detecting means 18 for detecting a zero voltage of the AC power supply 1 and outputting a pulse signal; Power switch state detecting means 19 for detecting the open / close state of the power switch 2 based on the input signal from the input voltage detecting means 17 and the input signal from the zero voltage detecting means 18 is newly provided. Further, in addition to the standby mode, the IH heating mode, and the roaster mode shown in the conventional example, the control means 16 includes an induction heating unit 3, a roaster heating unit 7, an induction heating unit display unit 83,
And a new off mode for stopping the driving of the roaster heating section display means 84, and when the control means 16 detects that the power switch 2 is off based on a signal input from the power switch state detection means, sets the off mode. When it is detected that the power switch 2 is turned on from off, the standby mode is set first, and then the IH heating mode or roaster mode is set based on a signal input from the input means 9. Further, a first temperature detecting means which is constituted by an AD converter or the like and converts the temperature detected by the first temperature sensing element 10 or the second temperature sensing element 14 into a digital signal of a predetermined number of digits (8 bits). 20 and a second temperature detecting means 21 are newly provided, and the high temperature display driving unit 1 is controlled by the control means 16 based on a signal input from the first temperature detecting means 20.
1 to control the fan motor drive unit 13 based on a signal input from the second temperature detection means 21, the fan motor drive detection unit 15 is eliminated, and the configuration of the high temperature display drive unit 11 is simplified. That is.

FIG. 2 is a diagram showing a circuit configuration of the input voltage detecting means 17 and the zero voltage detecting means 18. First,
The cathode side of the voltage that has been full-wave rectified by the rectifier 30 is defined as a reference voltage point (hereinafter referred to as GND).
Control is performed based on D. Then, as shown in FIG. 2, the input voltage detecting means 17 divides the input voltage V1 to the inverter circuit 33 by resistors R171 and R172 connected in series via the diode D172, and inputs the voltage to the capacitor C171 via the resistor R173. Let it. Further, the zero voltage detecting means 18 includes a resistor R181 or R182 and a diode D181 depending on the polarity of the voltage AC1 to AC2 of the AC power supply 1.
, Resistors R183 and R184 are connected in series, and the comparator IC 181 outputs the input voltage from the AC power supply 1 to ((R181 or R182) + R183) and R1
The voltage divided at 84 is compared with the fixed voltage defined by R185 and R186, and an “open” signal or an “L” signal is output.

The operation of the heating cooker configured as described above will be described with reference to FIGS. 3 and 4. FIG.
FIG. 3 is a diagram showing outputs of the input voltage detecting means 17 and the zero voltage detecting means 18. First, the output of the input voltage detecting means 17 will be described. When the power switch 2 is ON, the input voltage V1 to the inverter circuit 33 is full-wave rectified by the rectifier 30 from the input voltage from the AC power supply 1 shown in FIG. The waveform is as follows. The input voltage detecting means 17 converts this voltage V1 into R171, D172,
The voltage is divided by the series circuit of R172 and R172 to charge C171 and output to the power switch state detecting means 19. As shown in FIG. 2, the anode voltage of D172 is V
11, if the voltage of C171 is V12, the input voltage V1 to the inverter circuit 33 has a peak value (P in FIG. 3B).
In the vicinity, V11> V12, and C171 is charged via R173. Otherwise, V11 <V12
By the action of D172, V12 becomes C171, R17
3. Discharge waveform due to R172. That is, R17
3 is set to be small and R172 is set to be a large constant.
The input voltage V to the inverter circuit 33 as shown in FIG.
An almost DC voltage proportional to the peak value of 1 can be output. However, when the power switch 2 is off, the input voltage V1 to the inverter circuit 33 is 0 V, and the output voltage V12 of the input voltage detecting means 17 is also C171,
It is discharged by R173 and R172, and eventually becomes 0V. Note that D171 is a protection diode, which suppresses the maximum value of the voltage V12 input to the power switch state detecting means 19 to about VD2.

Next, the output of the zero voltage detecting means 18 will be described. As shown in FIG. 2, when the power switch 2 is turned on, the output on the low potential side of the AC power supply 1 becomes GND. When the voltage is set so that R181, R182 >> (R183 + R184), the voltage of the AC power supply 1 becomes as shown in FIG.
When the polarity is 1, R182, D181, R18
3, and a voltage obtained by dividing the input voltage from the AC power supply 1 by the series circuit of R184 is input to the negative input of the comparator IC181. In the case of the polarity 2 in FIG. 3A, this time, approximately R181, D181, R183, and R18
The voltage obtained by dividing the input voltage from the AC power supply 1 by the series circuit 4 is input to the negative input of the IC 181. That is,
When a constant is set so that R181 = R182, a voltage obtained by full-wave rectifying the input voltage from the AC power supply 1 and dividing the resistance is input to the negative input of the IC 181. And IC181
Are the negative and positive inputs R185 and R186.
And outputs an "open" signal or an "L" signal to form a pulse waveform as shown in FIG. 3 (d) and output it to the control means 16 and the power switch state detecting means 19. I do. (Hereinafter, this output is referred to as V21.) However, when the power switch 2 is turned off, in the case of the polarity 1, R18 is turned on in the same manner as when the power switch 2 is turned on.
2, the voltage divided by the series circuit of D181, R183, and R184 is input to the negative input of the IC 181. In the case of the polarity 2, GND is cut off from the output of the AC power supply 1, and the operation of the IC 181 is performed by the action of D181. Negative input is 0V
Becomes Therefore, the output of the zero voltage detecting means 18 is as shown in FIG.
As shown in FIG. 3 (e), the waveform of FIG. C181 is a capacitor for noise, R187 limits the input current of IC181, and R186 is provided so that V21 becomes "H" output when IC181 outputs "open" signal.

Next, the operation of the power switch state detecting means 19 will be described with reference to FIG. FIG. 4 is a flowchart showing the operation of the power switch state detecting means 19. As shown in FIG.
Is the input V21 from the zero voltage detecting means 18 in step 1.
Monitors the rise from “L” to “H”, and when the rise is detected, waits for 5 ms (when the AC power supply 1 is at 50 Hz) in step 2 and waits until the peak value of the AC power supply 1 is reached. I do. Then, in steps 3 and 4, the input V21 from the zero voltage detecting means 18
And the input V12 from the input voltage detecting means 17 is sequentially monitored. Note that the reason for waiting for 5 ms in step 2 is that the input V12 from the input voltage detecting means 17
This is an analog signal including a ripple as shown in (c), because the power switch state detecting means 19 reads the peak value of the analog signal.

Now, when the AC power supply 1 is at the rated voltage, the output V12 of the input voltage detecting means 17 = 5.0V (= VD2).
When the constants of R171 and R172 are set so as to be as follows, when the power switch 2 is on, V12 = 5.0V (≧ 2.5V) and V21 = “as shown in FIGS. 3C and 3D. L ", the flow branches to step 5 to output a power switch on signal indicating that the power switch 2 is on. However, when the power switch 2 is off, V12 = 0 V (<2.5 V).
Since V21 = “H” as shown in (e), the flow branches to step 6 to output a power switch-off signal indicating that the power switch 2 is off.

Here, it is possible to detect the ON / OFF of the power switch 2 only in one of the input voltage detecting means 17 and the zero voltage detecting means 18, that is, in either step 3 or step 4. By using both the input signals of the two constituent means as criteria, even if one of the constituent means malfunctions due to the influence of noise or the like, the on / off detection of the power switch 2 can be performed by the other constituent means. Thus, it is possible to more accurately and stably detect the on / off state of the power switch 2.

As shown in steps 3 and 4, the input voltage detecting means 17 and the zero voltage detecting means 1
When both 8 are signals indicating that the power switch 2 is on, the power switch state detection means 19 detects that the power switch 2 is on, and either the input voltage detection means 17 or the zero voltage detection means 18 determines whether the power switch 2 is on. The power switch state detecting means 19 detects that the power switch 2 is off when the signal indicates that the power switch 2 is off.
The control means 16 can set the off mode when the power switch 2 is off to prioritize the off detection of the power over the on detection to the influence of noise or the like, thereby improving the safety of the device.

When the power switch 2 is changed from on to off, the output V12 of the input voltage detecting means 17 becomes C17.
1, R173 and R172 gradually decrease, and when a capacitor is provided between the input terminals of the inverter circuit 33, the degree of the decrease becomes further gentle, and after the power switch 2 is turned off, V12 < 2.5V
, While the output V21 of the zero voltage detecting means 18 can be instantaneously switched from the waveform shown in FIG. 3D to the waveform shown in FIG. 3E. That is, the power switch state detecting means 19 detects the state change of the power switch 2 more quickly and accurately by the signal input from the zero voltage detecting means 18 than by the signal input from the input voltage detecting means 17. Can be.

When the power switch on signal is input from the power switch state detecting means 19, the control means 1
6 controls the output of the induction heating unit 3 or the roaster heating unit 7 by selecting the IH heating mode or the roaster mode based on the signal input from the input unit 9, and displays the induction heating unit display unit 83 or the roaster heating unit display unit 84. And the output state of the induction heating unit 3 or the roaster heating unit 7 can be displayed. Further, the control unit 16 can change the output of the induction heating unit 3 or the roaster heating unit 7 based on a signal input from the input unit 9. Further, when the induction heating unit 3 or the roaster heating unit 7 is driven, the control unit 16 outputs an “H” signal to the fan motor driving unit 13 to turn on the transistor Q131 to operate the phototriac IC 131 to operate the fan motor 1
2 is driven. Further, when the control means 16 detects that the top plate 5 is in a high temperature state based on an input signal from the first temperature detection means 20, it outputs an "H" signal to the high temperature display drive section 11 to turn on the transistor Q112. LED 81 which is high temperature display means 81 is turned on.

However, when the power switch off signal is input from the power switch state detecting means 19, the control means 1
6 sets an off mode, immediately stops driving the induction heating unit 3 and the roaster heating unit 7, and turns off the induction heating unit display unit 83 and the roaster heating unit display unit 84. Further, the control unit 16 prohibits the input from the input unit 9 from being accepted, maintains the off mode, and prevents the induction heating unit 3 or the roaster heating unit 7 from being driven even when the input unit 9 is operated.

When the control means 16 receives the power switch on signal from the power switch state detection means 19 in the off mode, the control means 16 detects that the power switch 2 has changed from off to on, and switches from the off mode to the standby mode. Move to Thereafter, the mode can be shifted to the IH heating mode or the roaster mode based on a signal input from the input means 9.

With the above configuration, the power switch 2
Control power supply unit 6 that generates a DC voltage regardless of the state of
In the configuration in which the outputs VD1 and VD2 are used as the operating power source of the control means 16, the control means 16 detects that the power switch 2 is off, sets the off mode, and stops the driving of the induction heating unit 3 and the roaster heating unit 7. can do. When the power switch 2 is off, the control means 16 prohibits the input from the input means 9 to increase safety, and the equipment is unusable because the power switch 2 is off. This can be clearly indicated to the person who uses the device. Further, the control unit 16 detects that the power switch 2 is turned off, and turns off the induction heating unit display unit 83 and the roaster heating unit display unit 84, so that the induction heating unit 3 and the roaster heating unit 7 cannot be heated. Can be displayed. Further, when the control unit 16 detects that the power switch 2 is turned on from off, the control unit 16 sets a standby mode, so that the induction heating unit 3 or the roaster heating unit 7 starts heating as soon as the power switch 2 is turned on. And ensure safety. Further, when the control means 16 sets the IH heating mode or the roaster heating mode by turning on the power switch 2,
By operating the power switch 2 to be turned off and then turned on, the mode set by the control means 16 can be returned to the standby mode, and the operation state of the device can be initialized.

Further, since the outputs VD1 and VD2 of the control power supply section 6 for generating a DC voltage regardless of the state of the power switch 2 are used as the operating power supply of the control means 16, even if the power switch 2 is off, the control means 16 is not used. Is operable, the fan motor drive detection unit 15 is eliminated from the conventional example, and the configuration of the high temperature display drive unit 11 is simplified to reduce the number of parts and cost. Based on the input signal from the first temperature detecting means 20, the high temperature display driving section 11 is controlled by detecting that the top plate 5 is at a high temperature, and the high temperature displaying means 81 is turned on. The fan motor 12 can be driven by controlling the fan motor driving unit 13 by detecting that the inside of the roaster compartment is hot based on the input signal.

Further, when the control means 16 detects that the power switch 2 is turned off and detects that the top plate 5 is hot when the off mode is set, the high temperature display means 81 blinks. By controlling the high-temperature display drive unit 11, the high-temperature display when the power switch 2 is off can be further emphasized.

Further, the control means 16 controls the zero voltage detecting means 1
It is also possible to control the induction heating unit 3, the roaster heating unit 7 and the like in association with the pulse signal input from the input unit 8, and when the power switch 2 is on, as shown in FIG. Outputs a pulse signal in synchronization with the zero voltage point of the AC power supply 1, the control means 16 adjusts the output of the induction heating unit 3 every half cycle of the AC power supply 1 to increase the response speed, The relay drive circuit 73 is controlled so as to open and close the contacts at the zero voltage point of the AC power supply 1 to improve the contact life of the relay 72, and the phase control of the fan motor drive unit 13 to control the rotation speed of the fan motor 12. Or when a triac is provided, current consumption can be suppressed by pulse driving. Further, even when the power switch 2 is off, a pulse signal corresponding to the polarity of the AC power supply 1 and changing to "H" or "L" in synchronization with the zero voltage point is output as shown in FIG. The control means 16 can perform control such as blinking the high temperature display means 81 at a predetermined cycle.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a view showing a heating cooker according to a second embodiment of the present invention. The characteristic configuration of the present embodiment is that the control unit 16 controls the zero voltage detection unit 1.
When the second temperature sensing element 14 measures the maximum time (10 minutes) for driving the fan motor when the temperature of the second temperature sensing element 14 is high, the power switch state detection means 19 is held. In this configuration, one of the two counting methods is selected based on a signal input from the CPU and the time is measured.

The operation of the heating cooker configured as described above will be described with reference to FIGS. FIG.
5 is a flowchart showing a time measuring method of the control means 16. As shown in FIG. 5, first, at step 11, it is detected that the input V21 from the zero voltage detecting means 18 rises from "L" to "H". When the rise is detected, the on / off state of the power switch 2 is identified in step 12 based on a signal input from the power switch state detecting means 19. Then, when it is detected that the power switch 2 is on, the counter A is incremented by 1 at step 13, and when it is detected that the power switch 2 is off, the counter A is incremented by 2 at step 14. Thereby, one cycle of the AC power supply 1 = 2
During 0 ms (50 Hz), when the power switch 2 is on, +1 and +1 are executed twice as shown in FIG. 3D to add up to +2, and when the power switch 2 is off, FIG.
As shown in (e), +2 is executed only once. That is, regardless of the on / off state of the power switch 2, the counter A can be incremented by +2 during one cycle of the AC power supply 1. When the output of the induction heating unit 3 or the roaster heating unit 7 is ON in Steps 15 and 16, the counter A is initialized to 0, so that both the induction heating unit 3 and the roaster heating unit 7 output the time measurement. You can start it off.

When the output of both the induction heating unit 3 and the roaster heating unit 7 is off, the second
If the second temperature sensing element 14 ≧ 90 ° C. is detected based on the signal input from the temperature detecting means 21 and if it is determined in step 19 that the counter A is less than 10 minutes, the fan motor 12 is turned on in step 1a. It controls the motor drive unit 13.

With the above configuration, the power switch 2
Control power supply unit 6 that generates a DC voltage regardless of the state of
In the configuration in which the output VD1 or VD2 is used as the operating power source of the control means 16, measurement for a certain period of time is possible regardless of the state of the power switch 2, and after the heating by the induction heating unit 3 and the roaster heating unit 7 is stopped, The driving time of the fan motor 12 until the second temperature sensing element 14 <90 ° C. can be set to a maximum of 10 minutes regardless of the on / off state of the power switch 2.

In the second embodiment, only the maximum drive time of the fan motor 12 at the time of stopping the heating is described. However, the heating of the induction heating unit 3 or the roaster heating unit 7 is automatically stopped after a predetermined time has elapsed. A similar effect can be obtained for time measurement in applications such as a timer function.

Embodiment 3 Hereinafter, a third embodiment of the present invention will be described with reference to FIG. FIG. 1 is a view showing a heating cooker according to a third embodiment of the present invention. The characteristic configuration of the present embodiment is that the control means 16 includes the top plate 5.
When it is detected that the temperature is high, the high temperature display means 81 is turned on when the IH heating mode or the roaster heating mode is set, and the high temperature display means 81 is blinked when the standby mode or the off mode is set. I do. The control means 16 holds two methods of counting the pulse signal input from the zero voltage detection means 18 and when the high temperature display means 81 blinks, based on the signal input from the power switch state detection means 19, One of the counting methods is selected to measure the blinking period.

The operation of the cooking device configured as described above will be described with reference to FIGS. FIG.
5 is a flowchart showing a method of measuring the LED blinking cycle of the control means 16. As shown in FIG. 6, first, step 2
At 1, it is detected that the input V21 from the zero voltage detecting means 18 rises from "L" to "H". When the rise is detected, the on / off state of the power switch 2 is identified based on the input signal from the power switch state detecting means 19 in step 22, and when the power switch 2 is detected to be on, the counter B is incremented by 1 in step 23. When it is detected that the power switch 2 is off, the counter B is incremented by 2 at step 24. Thereby, one cycle of AC power supply 1 = 20
If the power switch 2 is on during ms (50 Hz), it is executed twice as +1 and +1 as shown in FIG. 3D, and the total is +2, and when the power switch 2 is off, FIG.
As shown in (e), +2 is executed only once. That is, the counter B can be incremented by +2 during one cycle of the AC power supply 1 regardless of the on / off state of the power switch 2. Further, when the counter B becomes equal to or more than 2 s in the steps 25 and 26, the counter B is initialized to 0, so that the counter B overflows at a period of 2 s.

Then, in step 27, the first temperature sensing element 10 is operated based on the signal input from the first temperature detecting means 20.
If ≧ 65 ° C. is detected and the output of both the induction heating unit 3 and the roaster heating unit 7 is off, the counter B is referred to in step 2a, and the LED
1 is turned on in step 2b or turned off in step 2c.

With the above configuration, the power switch 2
Control power supply unit 6 that generates a DC voltage regardless of the state of
, The output VD1 or VD2 is used as an operating power supply for the control means 16 and the high-temperature display means 81, regardless of the state of the power switch 2.
Can be displayed blinking.

(Embodiment 4) Hereinafter, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 1 is a view showing a heating cooker according to a fourth embodiment of the present invention. The characteristic configuration of the present embodiment is that the display unit 8 includes a power switch state display unit 82 for displaying the state of the power switch 2, and the control unit 16 displays the power switch state based on an input signal from the power switch state detection unit 19. Controlling the means 82.

The operation of the cooking device configured as described above will be described with reference to FIG. FIG. 7 is a flowchart relating to the control of the power switch state display means 82 by the control means 16. As shown in FIG. 7, the control means 16 determines in step 32 the signal input from the power switch state detection means 19 in step 31. If the input signal = power switch on signal, the control section 16 branches to step 33 to display the power switch state. The LED 82 as the means 82 is turned on,
If the input signal = power switch off signal, the process branches to step 34 to turn off the LED 82.

With the above configuration, the power switch 2
Control power supply unit 6 that generates a DC voltage regardless of the state of
In the configuration in which the output VD1 or VD2 is used as the operating power source of the control means 16 and the power switch state display means 82, the power switch state display means 82 is turned on when the power switch 2 is on, and is turned off when the power switch 2 is off. The power switch status display means 82 is turned off, and the on / off state of the power switch 2 can be displayed by the power switch status display means 82.

(Embodiment 5) Hereinafter, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 1 is a view showing a heating cooker according to a fifth embodiment of the present invention. The characteristic configuration of the present embodiment is that the control unit 16 detects that the AC power supply 1 is out of power when the input V21 from the zero voltage detection unit 18 does not detect the rise from “L” to “H” for about 22 ms or more. When it is determined that there is, the output of the induction heating unit 3 and the roaster heating unit 7 is turned off, the fan motor driving unit 13 is controlled so that the fan motor 12 is turned off, and all the components in the display unit 8 are turned off. It is to control.

The operation of the heating cooker configured as described above will be described with reference to FIGS. 2 and 3. First, as a premise, the control power supply unit 6 is provided with capacitors C61 and C62, and when the AC power supply 1 is interrupted for a moment, the circuit operation of the control means 16 and the like is performed using the power stored in C61 and C62. Configuration.
When the AC power supply 1 is normal, as shown in FIGS. 3D and 3E, the control unit 16 changes the input V21 from the zero voltage detection unit 18 from "L" to "H" at least once every 20 ms. ”Is detected. But,
When the AC power supply 1 loses power, the negative input of the comparator IC 181 obtained by dividing the voltage of the AC power supply 1 shown in FIG. 2 becomes 0 V, and the output of the zero voltage detecting means 18 is fixed at "H". Cannot detect the rise from “L” to “H”.

Therefore, one cycle of the AC power supply 1 (= 20 ms)
However, a power failure detection time (= 22 ms) is set with respect to 50 Hz) in consideration of the variation and the like, and the control means 16 controls the input V21 from the zero voltage detection means 18 during the power failure detection time or more.
If the rise from “L” to “H” is not detected, it is determined that the AC power supply 1 is out of power. When the control unit 16 detects a power failure of the AC power supply 1, the induction heating unit 3,
All the load circuits related to the roaster heating unit 7, the fan motor 12, and the display unit 8 are turned off, and the consumption of the electric power stored in C61 and C62 is minimized.

With the above configuration, the power switch 2
Control power supply unit 6 that generates a DC voltage regardless of the state of
In the configuration in which the output VD1 or VD2 is used as the operating power source of the control means 16, the power failure of the AC power source 1 is quickly detected, all loads are turned off, and the driving of the induction heating unit 3 and the roaster heating unit 7 is stopped. While ensuring the safety of the equipment,
The operation of the control means 16 can be ensured for a longer-time power failure by suppressing power consumption at the time of the power failure. Further, since the open / close state of the power switch 2 and the power failure state of the AC power supply 1 can be identified by the zero voltage detection means 18, it is not necessary to newly provide a constituent means for detecting the power failure of the AC power supply 1 and the circuit. The configuration can be simplified.

(Embodiment 6) Hereinafter, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 1 shows a heating cooker according to a sixth embodiment of the present invention. The characteristic configuration of the present embodiment is that, even if the control unit 16 detects that the power switch 2 is turned off based on the signal input from the power switch state detection unit 19, the power switch 2 is kept for a predetermined time (1.0 s). In this configuration, the mode before the detection of the OFF state is held as the setting mode, and after the predetermined time, the setting mode is initialized to the standby mode.

The operation of the heating cooker configured as described above will be described with reference to FIG. FIG. 8 is a flowchart relating to the setting holding operation of the control means 16. As shown in FIG. 8, the control means 16 first initializes the setting mode to the standby mode in step 41, and thereafter starts the following operation. In step 42, the setting mode is changed from the standby mode to the IH mode in which the induction heating unit 3 is driven with a predetermined output or the roaster mode in which the roaster heating unit 7 is driven with a predetermined output based on a signal input from the input means 9. Then, in step 43, the control means 16 controls the output of the induction heating unit 3 based on the setting mode, or controls the relay drive circuit 73 so as to turn on and off the power supply to the heater 71 of the roaster heating unit 7. Step 4
In step 4, the timer 1 for measuring the predetermined time 1.0 s is cleared to 0.

When it is determined in step 45 that the power switch 2 is turned on based on the signal input from the power switch state detecting means 19, the process returns to step 42 and the operations in steps 42 to 44 are repeated. However, when it is detected in step 45 that the power switch 2 has been turned off, the flow branches to step 46 and the control means 16 sets the off mode to stop driving the induction heating unit 3 and the roaster heating unit 7 and the like. The timer 1 starts operating. Then, when the elapse of 1.0 s is detected in step 48, the setting mode is initialized to the standby mode. This operation (steps 45 to 49) is repeatedly performed until it is detected in step 45 that the power switch is turned on.

That is, if the power switch 2 is detected to be on within 1.0 s after the power switch 2 is detected to be turned off, the process returns to step 42 without performing step 49. It is held in a state before the detection, that is, before the processing of steps 45 to 48 is performed.

With the above configuration, the power switch 2
Control power supply unit 6 that generates a DC voltage regardless of the state of
In the configuration in which the output VD1 or VD2 is used as the operating power source of the control means 16, even if the power switch 2 changes from on to off, if the power switch 2 is turned on again within a predetermined time (1.0 s), the control means 16 When the power supply switch 2 is turned on after the predetermined time (1.0 s), the control unit 16 sets the standby mode. The operation of the induction heating unit 3 and the roaster heating unit 7 can be started from the drive stop.

In the first to sixth embodiments, the frequency of the AC power supply 1 is set to 50 Hz. For 60 Hz, the standby time 5 ms in step 2 in FIG. 4 is changed to 4.15 ms. 1s = 100 counts as 1
The same effect can be obtained by changing to s = 120 counts. Further, the control means 16 determines whether the frequency of the AC power supply 1 is 50 Hz or 60 Hz based on the signal input from the zero voltage detection means 18, and according to the determined frequency, the standby time of step 2 in FIG. (5 ms / 4.15 ms) and the 1s count number (100 counts / 120 counts) shown in FIGS. 5 and 6 can be adopted.

Further, in the present embodiment, the zero voltage detecting means 18
Although the rectifier required as a circuit configuration for forming the pulse signal output by the rectifier is shared with the rectifier 30 of the induction heating unit 3 to simplify the device configuration, the rectifier is provided even when the induction heating unit 3 is not provided. The same effect can be obtained by providing only 30 at the same location as in this embodiment.

Further, the input voltage detecting means 17 is provided for detecting the on / off of the power switch 2, but is similar to the input voltage detecting means 17 for correcting the output of the induction heating unit 3 based on the voltage of the AC power supply 1. In the case where the above-mentioned constitutional means is provided, it can also serve as such.

Further, a part or all of the control means 16, input voltage detecting means 17, zero voltage detecting means 18, power switch state detecting means 19, first temperature detecting means 20, and second temperature detecting means 21 are provided. Obviously, the constituent means can be realized by a microcomputer.

[0062]

As described above, according to the first aspect of the present invention, the control power supply section for outputting a voltage regardless of the open / closed state of the power switch, and the input voltage detecting means for detecting the input voltage of the heating section are provided. Power switch state detecting means for detecting an open / close state of a power switch based on a signal input from the input voltage detecting means, wherein the control means uses an output voltage of the control power supply as an operation source, and the power switch state detecting means When the power switch is detected to be in an open state based on a signal input from the controller, at least the driving of the heating unit is stopped and an off mode in which a heating command is not received is set, and a signal input from the power switch state detection unit is set. When the power switch is detected from the open state to the closed state based on the standby mode, at least the driving of the heating unit is stopped to wait for a heating command. With the configuration to be set, the configuration of the control power supply unit is simplified by using the output of the control power supply unit that generates a predetermined voltage irrespective of the state of the power switch as the operation source of the control means, and the number of parts is reduced and the cost is reduced. The user can operate the power switch to clear the operation mode of the control unit while preventing the heating unit from being driven immediately after changing the power switch from the open state to the closed state. . The control means can operate even when the power switch is open.For example, a temperature sensing element is provided near the heating unit, and the control means performs high temperature display based on an input signal of the temperature sensing element or performs cooling fins. , The safety of the device can be enhanced.

According to the second aspect of the present invention, when the control means detects that the power switch is open based on the signal input from the power switch state detection means, it controls a part or all of the display unit. With the configuration to stop driving,
When the power switch is open, the display such as the high temperature display can be turned on, the display related to the output of the heating unit can be turned off, and the display unit can display that the heating unit cannot be heated. The display contents of the section can be enhanced.

According to the third aspect of the present invention, the display unit includes the power switch status display means for displaying the open / closed state of the power switch, and the control means based on a signal input from the power switch state detection means. With the configuration for controlling the power switch state display means, a user of the device can recognize the open / closed state of the power switch at a glance without delay by the power switch state display means.

According to the fourth aspect of the present invention, the control means stores the latest operation state such as the output of the heating unit when the power switch is closed, and switches the power switch from the closed state to the open state. When the power switch is detected to change from the open state to the closed state within a predetermined time after the change is detected, the output and the like of the heating unit are controlled based on the operation state stored and held. It is possible to prevent the operation state of the device from being changed by the operation of the power switch within the range, and to realize a function of recovering from an unexpected operation of the power switch.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of a heating cooker according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of a main part of the cooking device;

FIG. 3 is an operation waveform diagram of the cooking device.

FIG. 4 is a flowchart showing an operation of detecting a power switch state of the cooking device;

FIG. 5 is a flowchart showing time measurement of the cooking device according to the second embodiment of the present invention.

FIG. 6 is a flowchart for blinking an LED of a heating cooker according to a third embodiment of the present invention;

FIG. 7 is a flowchart relating to a display of a power switch state of a cooking device according to a fourth embodiment of the present invention;

FIG. 8 is a flowchart illustrating a setting holding operation of the heating cooker according to the sixth embodiment of the present invention.

FIG. 9 is a circuit diagram of a conventional cooking device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 AC power supply 2 Power switch 3 Induction heating part 4 Load pan 5 Top plate 6 Control power supply part 7 Roaster heating part 8 Display part 9 Input means 10 1st temperature sensing element 11 High temperature display drive part 12 Fan motor 13 Fan motor drive part 14 Second temperature sensing element 16 Control means 17 Input voltage detecting means 18 Zero voltage detecting means 19 Power switch state detecting means 20 First temperature detecting means 21 Second temperature detecting means

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Fujii 1006 Kazuma Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. 72) Inventor Kenji Noda 1006 Kazuma Kadoma, Kazuma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd.

Claims (4)

[Claims] 1. A heating unit connected to a power supply via a power switch, a control power supply unit connected to the power supply without passing through the power switch, and an input for detecting a magnitude of an input voltage of the heating unit. Voltage detecting means, power switch state detecting means for detecting the open / closed state of the power switch based on an output signal of the input voltage detecting means, and control for controlling the output of the heating section while receiving power supply from the control power supply section Means for controlling the heating unit based on an output signal of the power switch state detection means, and when the power switch is detected to be in an open state, stops the driving of the heating unit and sets an off mode in which a heating command is not received. When the power switch is detected to change from an open state to a closed state, the heating unit stops driving the heating unit and sets a standby mode for waiting for a heating instruction. 2. The heating device according to claim 1, further comprising a display unit for displaying at least a heating state of the heating unit, wherein the control unit stops driving at least a part of the display unit when an off mode is set. Cooking device. 3. The cooking device according to claim 1, further comprising a display unit for displaying at least an open / closed state of a power switch. 4. The control means stores and holds an operation state such as the latest output of the heating unit when the power switch is closed, and after detecting that the power switch changes from the closed state to the open state, The cooking device according to claim 1, wherein upon detecting that the power switch changes to a closed state within a predetermined time, an output of the heating unit is controlled based on the stored operation state.