JP2008282697A - Heating cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable using a heating means capable of heating while attaining a cost reduction by sharing a power supply relay. <P>SOLUTION: A relay 10 to connect a commercial power supply 1 to heating means 6, 7 is shared. Driving means 8a, 9a driving the relay 10 belong to control means 8, 9 controlling respective heating means 6, 7. The relay 10 is normally driven by one driving means, and is controlled to detect a contact state by a contact detecting means. Thereby, a cost reduction is attained by reducing the number of power supply relays, and a heating means capable of heating other than a troubled heating means can be used. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a heating cooker.

Conventionally, this type of cooking device has a power relay that opens and closes the connection between the commercial power source and the heating means, and a power switch with a very small current. By connecting the means and heating the pan, etc., when not in use, the power switch is operated to open the power relay and shut off the power supply to the heating means to realize the safety of the equipment ( For example, see Patent Document 1). Furthermore, in the case of a heating cooker having a plurality of heating means, by providing a power relay between each heating means and the commercial power supply, other heating means can be used even if one of the mouths breaks down. (For example, refer to Patent Document 2).
Japanese Patent Laid-Open No. 11-260540 JP 2004-158386 A

  However, in the conventional configuration, since the power relay is used between each heating means and the commercial power source, the cost of the power relay is increased. In addition, when the power relay is shared, a driving means for the power relay that does not belong to each heating means is required, but when the driving means fails, it can be heated by the heating means. Nevertheless, there is a problem that not all heating means can be used.

  An object of the present invention is to solve the above-described conventional problems, and to reduce the cost by using a common power supply relay and to enable use of a heating means other than the failed heating means.

  In order to solve the above-described conventional problems, the cooking device of the present invention has a common power supply opening / closing means for connecting each heating means and a commercial power supply, and a driving means for driving the power supply opening / closing means controls each heating means. Usually, the power supply switching means is driven by one drive means, and the contact detection means controls to detect the contact state.

  Thereby, while reducing a power supply relay and aiming at cost reduction, use of the heating means which can be heated other than the failed heating means can be enabled.

  The heating cooker of the present invention can reduce the number of power supply relays and reduce the cost, and can use a heating means other than the failed heating means and can maintain the convenience of the heating cooker.

  A heating cooker according to a first aspect of the present invention includes a first heating unit and a second heating unit that can be heated independently, a first control unit and a second control unit that control each heating unit, and electric power to each heating unit. Power supply opening / closing means for switching on and off in common, first and second drive means for driving the power supply opening / closing means for the first and second control means, respectively, and a first state for detecting a contact state of the power supply opening / closing means And a second contact detection means, and normally the first control means controls the power supply opening / closing means to be driven by the first drive means and the first contact detection means to detect the contact state, It is possible to reduce the cost by reducing the power supply switching means.

  In the second invention, in particular, each control means of the heating cooker according to the first invention includes a communication means, and when the first contact detection means detects a contact abnormality of the power switching means, the communication means Therefore, the control means side that is not directly driving the power switching means can also know the contact abnormality of the power switching means. Stop and keep safe.

  According to a third aspect of the invention, in particular, the heating cooker of the second aspect of the invention is the second drive means of the second control means different from the first control means that drives the normal power supply opening / closing means when the contact is abnormal. The power source opening / closing means is driven. Even when the first driving means fails, the power source opening / closing means can be driven by the second driving means so that each heating means can perform heating.

  In a fourth aspect of the invention, in particular, in the cooking device of the second or third aspect of the invention, when communication is abnormal, each control means drives the power supply opening / closing means using the drive means, and the first control means is When communication is impossible by the communication means due to failure, the power supply opening / closing means can be driven by the second driving means and heating can be performed by the second heating means.

  Embodiments of the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the embodiments.

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

  In FIG. 1, 1 is a commercial power source, 2 and 3 are diode bridges for rectifying the commercial power source 1, 4 and 5 are smoothing capacitors for smoothing the power source rectified by the diode bridges 2 and 3, 6 is first heating means, and 7 is This is induction heating in which a high-frequency magnetic field is generated from the heating coil, resonant capacitor, and switching element by the second heating means, respectively, and the pan is heated via a top plate (not shown) on the heating coil. Reference numerals 8 and 9 denote first control means and second control means for controlling on / off of each switching element in the first heating means 6 and the second heating means 7 and independently controlling the heating power applied to the pan. A relay 10 opens and closes the connection between the commercial power source 1 and the first and second heating means. Reference numerals 8a and 9a denote a first drive means and a second drive means for driving the relay 10, respectively, belonging to the first control means 8 and the second control means 9, respectively, according to the control means to which the transistors 11 and photocouplers belong. 12 is driven to open and close the relay 10 by applying a voltage to the coil of the relay 10. Here, the reason why the transistor 11 and the photocoupler 12 are used to drive the relay 10 is that a reference potential is provided by different diode bridges, so that one side is a photocoupler for functional insulation. If the reference potential of all the control means is common, the photocoupler 12 may be a transistor. Reference numerals 8b and 9b denote first contact detection means and second contact detection means for detecting the open / closed state of the contact of the relay 10. The first contact detection means 8b is judged to be normal when it is detected that the first drive means 8a is open when the relay 10 is not driven and the first contact means 8a is closed when the relay 10 is driven by the first drive means 8a. If they are opposite, it is determined that the contact is abnormal. Based on the contact state detected by the first contact detection means 8b, the first control means 8 enables heating of the first heating means 6 when normal, and prohibits heating by the first heating means 6 when abnormal. At the same time, the first drive means performs a predetermined number of times (for example, 8 times) (repetition of ON / OFF). As a result, when the contact is finely welded and the contact state becomes normal (the driving logic and the contact logic are correct), heating by the first heating means 8 is possible, and if abnormal, the heating is prohibited. Continue state.

  Here, it is conceivable that the relay 10 is driven by both the first drive means 8a and the second drive means 9a, but in this case, if the drive timing shifts or one of the drive means fails, Since either the first contact detection circuit or the second contact detection circuit detects an abnormality and the driving means on the side determined to be abnormal results in a re-attack, the side detected as normal also becomes abnormal, and the first heating means 6 and the second heating means 7 may be prohibited from heating.

  Therefore, during normal use, the relay 10 is driven only by the first drive means 8a, and the contact state is detected by the first contact detection means 8b. Thereby, the 1st heating means 6 and the 2nd heating means 7 are connected with the commercial power source 1 by the common relay 10, and can be heated. By using the relay 10 in common, the cost can be reduced and the space can be reduced by reducing the number of relays. In the present embodiment, the number of heating means is two, but it can be similarly configured if there is no relay allowable current even if there are three or more. Although the heating means is induction heating, heating means such as a sheathed heater, a radiant heater, or a halogen heater has the same effect and can ensure safety. Moreover, although the normal drive means is the first drive means 8a, there is no difference in the second drive means 8b. In addition, the power supply on the coil side of the relay is a capacitor via a resistor and is driven by one transistor or phototransistor. However, a voltage is applied to the coil by one transistor without using a capacitor, or two transistors Therefore, there is no difference in the effect even when the applied voltage at the time of relay operation and holding is switched.

(Embodiment 2)
FIG. 2 is an overall configuration diagram of a heating cooker according to the second embodiment of the present invention. Here, the same functions are assigned the same reference numerals, and description thereof is omitted.

  FIG. 2 is a configuration in which the first communication means 13 and the second communication means 14 are provided in the first control means 8 and the second control means, respectively, in FIG. 1, and communication is performed between the respective communication means. The communication method is serial communication, but parallel communication is no different.

  During normal use, the relay 10 is driven only by the first drive means 8a, and the contact state is detected by the first contact detection means 8b. If the contact state is normal, the first communication unit 13 transmits a normal message to the second communication unit 14. When the second communication means 14 receives that the contact of the relay 10 is normal, the second control means 9 enables heating by the second heating means. As a result, both the first and second heating means can normally be heated.

  Next, when the contact abnormality of the relay 10 is detected by the first contact detection means 8b and the contact abnormality is detected even after the relay 10 is re-set by the second drive means, the first communication means 13 detects the contact abnormality second. Send to communication means. Thereby, the second control means side that is not directly driving the relay 10 can also recognize the contact abnormality, and the heating by the second heating means 7 can be prohibited, so that safety can be ensured. . When the second communication means receives the contact abnormality, the second drive means 9a drives the relay 10. Then, the contact state of the relay 10 is detected by the second contact detection means 9b. Here, when the second contact detecting means 9b detects that the contact is normal, the second control means 9 enables heating by the second heating means 7, and the second communication means 14 is the first communication means 13. Send contact to normal. When the first communication means 14 receives the contact normality, the second control means 9 determines that the second drive means 9a or the second contact detection means 9b is out of order and enables heating by the second heating means 7. Thereby, when the relay 10 is not out of order, both the 1st heating means 6 and the 2nd heating means 7 can be heated, and possibility that a user's usability will worsen can be reduced.

  Next, when the 2nd communication means 14 cannot receive the communication from a 1st communication means, the 2nd control means 9 judges that it is communication abnormality, and drives the relay 10 by the 2nd drive means 9a. Although the communication abnormality may be a failure of only the first and second communication means, there may be a case of a failure of the second control means 9 itself. In this case, heating by the second heating means 9 is allowed. Can do. As a result, the possibility of deteriorating the user's usability can be reduced. In the present embodiment, the number of heating means is two, but it can be similarly configured if there is no relay allowable current even if there are three or more. Although the heating means is induction heating, heating means such as a sheathed heater, a radiant heater, or a halogen heater has the same effect and can ensure safety. Moreover, although the normal drive means is the first drive means 8a, there is no difference in the second drive means 8b. In addition, the power supply on the coil side of the relay is a capacitor via a resistor and is driven by one transistor or phototransistor. However, a voltage is applied to the coil by one transistor without using a capacitor, or two transistors Therefore, there is no difference in the effect even when the applied voltage at the time of relay operation and holding is switched.

  As described above, the heating cooker according to the present invention can share the open / close means for connecting the commercial power source and each heating means, thereby reducing the cost and enabling the use of the heating means capable of heating. Therefore, the present invention can be applied not only to one cooking appliance but also to a systemically connected appliance.

The block diagram of the heating cooker in the 1st Embodiment of this invention The block diagram of the heating cooker in the 2nd Embodiment of this invention

Explanation of symbols

6 First heating means 7 Second heating means 8 First control means 8a First drive means 8b First contact detection means 9 Second control means 9a Second drive means 9b Second contact detection means 10 Relay 13 First communication means 14 Second communication means

Claims (4)

First heating means and second heating means that can be heated independently, first control means and second control means for controlling the respective heating means, and power supply opening / closing means for commonly turning on and off the supply of electric power to each heating means And first and second drive means for driving the power supply switching means respectively in the first and second control means, and first and second contact detection means for detecting the contact state of the power supply switching means, Is a heating cooker in which the first control means controls the power supply opening / closing means to be driven by the first drive means and the first contact detection means to detect the contact state. 2. The heating according to claim 1, wherein each control means includes a communication means, and when the first contact detection means detects a contact abnormality of the power switching means, the communication means transmits the contact abnormality to the second control means. Cooking device. 3. The cooking device according to claim 2, wherein when the contact is abnormal, the power supply opening / closing means is driven by the second drive means of the second control means different from the first control means driving the normal power supply opening / closing means. The cooking device according to claim 2 or 3, wherein, when communication is abnormal, each control means drives the power supply opening / closing means using the driving means.

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